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<meta name="description" content="The neuron-specific K-Cl cotransporter KCC2 maintains the low intracellular chloride concentration required for the fast hyperpolarizing actions of inhibitory neurotransmitters. The KCC2 gene codes for two isoforms, KCC2a and KCC2b, which differ in their N termini. The relative expression and cellul …"><meta name="keywords" content="pmid:19307176, PMC2679471, doi:10.1074/jbc.M807366200, Research Support, Non-U.S. Gov&#x27;t, Pavel Uvarov, Anastasia Ludwig, Matti S Airaksinen, Animals, Cell Line, Dimerization, Gene Expression Regulation / physiology*, Hippocampus / cytology, Hippocampus / metabolism*, Humans, K Cl- Cotransporters, Mice, Mice, Mutant Strains, Neurotransmitter Agents / metabolism, Protein Isoforms / biosynthesis, Symporters / biosynthesis*, PubMed Abstract, NIH, NLM, NCBI, National Institutes of Health, National Center for Biotechnology Information, National Library of Medicine, MEDLINE"><meta name="robots" content="index,nofollow,noarchive"><meta property="og:title" content="Coexpression and heteromerization of two neuronal K-Cl cotransporter isoforms in neonatal brain - PubMed"><meta property="og:url" content="https://pubmed.ncbi.nlm.nih.gov/19307176/"><meta property="og:description" content="The neuron-specific K-Cl cotransporter KCC2 maintains the low intracellular chloride concentration required for the fast hyperpolarizing actions of inhibitory neurotransmitters. The KCC2 gene codes for two isoforms, KCC2a and KCC2b, which differ in their N termini. The relative expression and cellul …"><meta property="og:image" content="https://cdn.ncbi.nlm.nih.gov/pubmed/persistent/pubmed-meta-image-v2.jpg"><meta property="og:image:secure_url" content="https://cdn.ncbi.nlm.nih.gov/pubmed/persistent/pubmed-meta-image-v2.jpg"><meta property="og:type" content="website"><meta property="og:site_name" content="PubMed"><meta name="twitter:domain" content="pubmed.ncbi.nlm.nih.gov"><meta name="twitter:card" content="summary_large_image"><meta name="twitter:title" content="Coexpression and heteromerization of two neuronal K-Cl cotransporter isoforms in neonatal brain - PubMed"><meta name="twitter:url" content="https://pubmed.ncbi.nlm.nih.gov/19307176/"><meta name="twitter:description" content="The neuron-specific K-Cl cotransporter KCC2 maintains the low intracellular chloride concentration required for the fast hyperpolarizing actions of inhibitory neurotransmitters. The KCC2 gene codes for two isoforms, KCC2a and KCC2b, which differ in their N termini. The relative expression and cellul …"><meta name="twitter:image" content="https://cdn.ncbi.nlm.nih.gov/pubmed/persistent/pubmed-meta-image-v2.jpg">
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Format:
</label>
<select id="email-citation-format" name="citation-format" class="action-panel-selector email-citation-format">
<option selected="selected" value="summary">Summary</option>
<option value="summary-text">Summary (text)</option>
<option value="abstract">Abstract</option>
<option value="abstract-text">Abstract (text)</option>
</select>
</div>
<div class="include-supplemental-container">
<input type="checkbox" aria-label="Include MeSH and other data" name="include-supplemental" id="email-include-supplemental" class="email-include-supplemental">
<label for="email-include-supplemental" class="email-include-supplemental-label">MeSH and other data</label>
</div>
<div class="form-field recaptcha ">
<div class="g-recaptcha" id="id-recaptcha" data-sitekey="6LfsWHMdAAAAAClKbtOpjQ2pMjgsGxvv7NdZW9uI"></div>
</div>
<div id="captcha-error-message" class="usa-input-error-message captcha-validation-message" role="alert"></div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Sending..."
data-ga-category="save_share"
data-ga-action="email"
data-ga-label="send">
Send email
</button>
<button class="action-panel-cancel"
aria-label="Close 'Email citations' panel"
ref="linksrc=close_email_panel"
aria-controls="email-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="email"
data-ga-label="cancel">
Cancel
</button>
</div>
<input type="hidden" name="email-search-details" value="" />
<input type="hidden" name="email-search-details-hash" value="0e42663a6c3bd85498fcb88798998fed7bfdc45d457db35281e41afe13cc0524" />
</form>
</div>
</div>
<div id="collections-action-panel"
class="collections-action-panel action-panel in-progress-dots-panel"
aria-hidden="true"
data-collections-open-panel-enabled="false"
data-collections-open-panel-url-hash="#open-collections-panel">
<div class="inner-wrap">
<h3 class="action-panel-heading">
Add to Collections
</h3>
<form id="collections-action-panel-form"
class="collections-action-panel-form action-panel-content action-form action-panel-smaller-selectors"
data-existing-collections-url="/list-existing-collections/"
data-add-to-existing-collection-url="/add-to-existing-collection/"
data-create-and-add-to-new-collection-url="/create-and-add-to-new-collection/"
data-get-article-ids-by-search-url="/get-article-ids-by-search/"
data-myncbi-max-collection-name-length="100"
data-add-to-collection-max-amount="1000"
data-collections-root-url="https://www.ncbi.nlm.nih.gov/myncbi/collections/">
<input type="hidden" name="csrfmiddlewaretoken" value="5NvyBCYCHkronwKu527a2tIPZgnZ9oTNmAfDesrYhVeShXQkIlKcwBetxk5b2Zr7">
<div class="choice-group" role="radiogroup">
<ul class="radio-group-items">
<li>
<input type="radio"
id="collections-action-panel-new"
class="collections-new"
name="collections"
value="new"
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="collections_radio_new">
<label for="collections-action-panel-new">Create a new collection</label>
</li>
<li>
<input type="radio"
id="collections-action-panel-existing"
class="collections-existing"
name="collections"
value="existing"
checked="true"
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="collections_radio_existing">
<label for="collections-action-panel-existing">Add to an existing collection</label>
</li>
</ul>
</div>
<div class="controls-wrapper">
<div class="action-panel-control-wrap new-collections-controls">
<label for="collections-action-panel-add-to-new" class="action-panel-label required-field-asterisk">
Name your collection:
</label>
<input
type="text"
name="add-to-new-collection"
id="collections-action-panel-add-to-new"
class="collections-action-add-to-new"
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/"
maxlength="100"
data-ga-category="save_share"
data-ga-action="create_collection"
data-ga-label="non_favorties_collection">
<div class="collections-new-name-too-long usa-input-error-message selection-validation-message">
Name must be less than 100 characters
</div>
</div>
<div class="action-panel-control-wrap existing-collections-controls">
<label for="collections-action-panel-add-to-existing" class="action-panel-label">
Choose a collection:
</label>
<select id="collections-action-panel-add-to-existing"
class="action-panel-selector collections-action-add-to-existing"
data-ga-category="save_share"
data-ga-action="select_collection"
data-ga-label="($('#collections-action-add-to-existing').val() === 'Favorites') ? 'Favorites' : 'non_favorites_collection'">
</select>
<div class="collections-retry-load-on-error usa-input-error-message selection-validation-message">
Unable to load your collection due to an error<br>
<a href="#">Please try again</a>
</div>
</div>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Adding..."
data-pinger-ignore
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="add">
Add
</button>
<button class="action-panel-cancel"
aria-label="Close 'Add to Collections' panel"
ref="linksrc=close_collections_panel"
aria-controls="collections-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="bibliography-action-panel"
class="bibliography-action-panel action-panel in-progress-dots-panel"
aria-hidden="true"
data-bibliography-open-panel-enabled="false"
data-bibliography-open-panel-url-hash="#open-bibliography-panel">
<div class="inner-wrap">
<h3 class="action-panel-heading">
Add to My Bibliography
</h3>
<form id="bibliography-action-panel-form"
class="bibliography-action-panel-form action-panel-content action-form action-panel-smaller-selectors"
data-add-to-bibliography-max-amount="100"
data-add-to-bibliography-batch-size="10"
data-bibliography-delegates-url="/list-bibliography-delegates/"
data-add-to-bibliography-url="/add-to-bibliography/"
data-get-article-ids-by-search-url="/get-article-ids-by-search/"
data-mybib-root-url="https://www.ncbi.nlm.nih.gov/myncbi/collections/mybibliography/">
<input type="hidden" name="csrfmiddlewaretoken" value="5NvyBCYCHkronwKu527a2tIPZgnZ9oTNmAfDesrYhVeShXQkIlKcwBetxk5b2Zr7">
<div class="action-panel-control-wrap bibliographies-controls">
<div class="choice-group">
<ul class="bibliographies-action-add radio-group-items">
<li>
<input name="bibliography" id="my-bibliography" class="my-bibliography" type="radio" checked/>
<label for="my-bibliography">My Bibliography</label>
</li>
</ul>
</div>
</div>
<div class="bibliographies-retry-load-on-error usa-input-error-message selection-validation-message">
Unable to load your delegates due to an error<br>
<a href="#">Please try again</a>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Adding..."
data-pinger-ignore>
Add
</button>
<button class="action-panel-cancel"
aria-label="Close 'Add to bibliography' panel"
ref="linksrc=close_bibliography_panel"
aria-controls="bibliography-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="mybib"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="saved-search-action-panel" class="saved-search-action-panel action-panel " aria-hidden="true"
data-saved-search-open-panel-enabled="false"
data-saved-search-open-panel-url-hash="#open-saved-search-panel">
<div class="inner-wrap">
<h2 class="action-panel-heading">
Your saved search
</h2>
<form id="saved-search-action-panel-form"
class="saved-search-action-panel-form action-panel-content action-form"
data-create-saved-search-url="/create-saved-search/"
data-try-search-terms-url="/try-search-term/"
data-saved-search-root-url="https://www.ncbi.nlm.nih.gov/myncbi/searches/">
<input type="hidden" name="csrfmiddlewaretoken" value="5NvyBCYCHkronwKu527a2tIPZgnZ9oTNmAfDesrYhVeShXQkIlKcwBetxk5b2Zr7">
<div class="action-panel-control-wrap">
<label for="saved-search-name" class="action-panel-label saved-search-name-label required-field-asterisk">
Name of saved search:
</label>
<input maxlength="200"
type="text"
name="saved-search-name"
id="saved-search-name"
class="saved-search-name"
value=""
required
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/">
</div>
<div class="action-panel-control-wrap">
<label for="saved-search-term" class="action-panel-label required-field-asterisk">
Search terms:
</label>
<textarea name="saved-search-term" id="saved-search-term" class="saved-search-term" required></textarea>
</div>
<div class="test-search-term-wrap">
<a href="#" class="try-search-term">Test search terms</a>
</div>
<div class="choice-group action-panel-extra-margin-top">
<span class="action-panel-label" id="fieldset-label">
Would you like email updates of new search results?
</span>
<fieldset id="saved-search-alert" aria-describedby="fieldset-label">
<legend class="usa-sr-only">Saved Search Alert Radio Buttons</legend>
<ul class="radio-group-items">
<li>
<input type="radio" id="saved-search-alert-yes" class="saved-search-alert-yes" name="saved-search-alert" value="yes" checked>
<label for="saved-search-alert-yes" class="action-panel-label">Yes</label>
</li>
<li>
<input aria-label="No radio input" type="radio" id="saved-search-alert-no" class="saved-search-alert-no" name="saved-search-alert" value="no">
<label for="saved-search-alert-no" class="action-panel-label">No</label>
</li>
</ul>
</fieldset>
</div>
<div class="alert-schedule-wrap">
<div class="action-panel-control-wrap">
<label class="action-panel-label">
Email:
</label>
<span aria-label="Email address" id="saved-search-email" class="action-panel-label"><span class="action-panel-label-bold"></span> (<a class="myncbi-account-settings" href="https://www.ncbi.nlm.nih.gov/account/settings/">change</a>)</span>
</div>
<div class="action-panel-control-wrap action-panel-extra-margin-top">
<label for="saved-search-frequency" class="action-panel-label">
Frequency:
</label>
<select id="saved-search-frequency" class="no-border-panel-selector saved-search-frequency">
<option value="monthly">Monthly</option>
<option value="weekly">Weekly</option>
<option value="daily">Daily</option>
</select>
</div>
<div class="action-panel-control-wrap saved-search-monthly-additional">
<label for="saved-search-monthly-on-day" class="action-panel-label">
Which day?
</label>
<select id="saved-search-monthly-on-day" class="no-border-panel-selector">
<option value="Sunday">The first Sunday</option>
<option value="Monday">The first Monday</option>
<option value="Tuesday">The first Tuesday</option>
<option value="Wednesday">The first Wednesday</option>
<option value="Thursday">The first Thursday</option>
<option value="Friday">The first Friday</option>
<option value="Saturday">The first Saturday</option>
<option value="day">The first day</option>
<option value="weekday">The first weekday</option>
</select>
</div>
<div class="action-panel-control-wrap saved-search-weekly-additional">
<label for="saved-search-weekly-on-day" class="action-panel-label">
Which day?
</label>
<select id="saved-search-weekly-on-day" class="no-border-panel-selector saved-search-weekly-on-day">
<option value="Sunday">Sunday</option>
<option value="Monday">Monday</option>
<option value="Tuesday">Tuesday</option>
<option value="Wednesday">Wednesday</option>
<option value="Thursday">Thursday</option>
<option value="Friday">Friday</option>
<option value="Saturday">Saturday</option>
</select>
</div>
<div class="action-panel-control-wrap">
<label for="saved-search-report" class="action-panel-label">
Report format:
</label>
<select id="saved-search-report" class="no-border-panel-selector saved-search-report">
<option value="DocSum">Summary</option>
<option value="DocSumText">Summary (text)</option>
<option value="Abstract">Abstract</option>
<option value="AbstractText">Abstract (text)</option>
<option value="MEDLINE">PubMed</option>
</select>
</div>
<div class="action-panel-control-wrap">
<label for="saved-search-amount" class="action-panel-label">
Send at most:
</label>
<select id="saved-search-amount" class="no-border-panel-selector saved-search-amount">
<option value="1">1 item</option>
<option value="5" selected>5 items</option>
<option value="10">10 items</option>
<option value="20">20 items</option>
<option value="50">50 items</option>
<option value="100">100 items</option>
<option value="200">200 items</option>
</select>
</div>
<div>
<input type="checkbox" id="saved-search-send-if-no-result" class="saved-search-send-if-no-result" name="saved-search-send-if-no-result">
<label for="saved-search-send-if-no-result" class="action-panel-label smaller-checkbox">
Send even when there aren't any new results
</label>
</div>
<div class="action-panel-control-wrap option-text-in-email-wrap">
<label for="saved-search-email-text" class="action-panel-label">
Optional text in email:
</label>
<textarea name="saved-search-email-text"
id="saved-search-email-text"
class="saved-search-email-text"></textarea>
</div>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Saving..."
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="save">
Save
</button>
<button class="action-panel-cancel"
aria-label="Close 'Your saved search' panel"
ref="linksrc=close_saved_search_panel"
aria-controls="saved-search-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="citation-manager-action-panel" class="citation-manager-action-panel action-panel" aria-hidden="true">
<div class="inner-wrap">
<h2 class="action-panel-heading">
Create a file for external citation management software
</h2>
<form id="citation-manager-action-panel-form"
class="action-panel-content action-form"
action="/results-export-ids/"
data-by-search-action="/results-export-search-data/"
data-by-ids-action="/results-export-ids/"
method="post"
data-by-search-method="post"
data-by-ids-method="post">
<input type="hidden" name="csrfmiddlewaretoken" value="5NvyBCYCHkronwKu527a2tIPZgnZ9oTNmAfDesrYhVeShXQkIlKcwBetxk5b2Zr7">
<input name="results-format" type="hidden" value="pubmed"/>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Sending..."
data-ga-category="save_share"
data-ga-action="citation_manager"
data-ga-label="save">
Create file
</button>
<button class="action-panel-cancel"
aria-label="Close 'Send citations to citation manager' panel"
ref="linksrc=close_citation_manager_panel"
aria-controls="citation-manager-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="citation_manager"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="rss-action-panel" class="rss-action-panel action-panel " aria-hidden="true">
<div class="inner-wrap">
<h2 class="action-panel-heading">
Your RSS Feed
</h2>
<form id="rss-action-panel-form"
class="rss-action-panel-form action-panel-content action-form"
data-create-rss-feed-url="/create-rss-feed-url/"
data-search-form-term-value="">
<input type="hidden" name="csrfmiddlewaretoken" value="5NvyBCYCHkronwKu527a2tIPZgnZ9oTNmAfDesrYhVeShXQkIlKcwBetxk5b2Zr7">
<div class="action-panel-control-wrap">
<label for="rss-name" class="action-panel-label required-field-asterisk">
Name of RSS Feed:
</label>
<input maxlength="200"
placeholder="Name"
type="text"
name="rss-name"
id="rss-name"
class="rss-name"
value=''
required
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/">
</div>
<div class="rss-limit-wrap">
<div class="action-panel-control-wrap action-panel-extra-margin-top">
<label for="rss-limit" class="action-panel-label">
Number of items displayed:
</label>
<select id="rss-limit" class="no-border-panel-selector rss-limit">
<option value="5">5</option>
<option value="10">10</option>
<option value="15" selected="selected">15</option>
<option value="20">20</option>
<option value="50">50</option>
<option value="100">100</option>
</select>
</div>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Creating..."
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="save">
Create RSS
</button>
<button class="action-panel-cancel"
aria-label="Close 'Your RSS' panel"
ref="linksrc=close_rss_panel"
aria-controls="rss-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="cancel">
Cancel
</button>
</div>
<div class="action-panel-control-wrap rss-link-copy-wrap">
<label for="rss-link" class="usa-sr-only">RSS Link</label>
<input placeholder="Your RSS Feed Link" type="text" name="rss-link" id="rss-link" class="rss-link" title="RSS Link">
<button
type="button"
disabled
class="rss-link-copy-button disabled"
data-ga-category="save_share"
data-ga-action="rss"
data-ga-label="copy">
Copy
</button>
</div>
</form>
</div>
</div>
</div>
</div>
<div class="article-page" id="article-page" data-article-pmid="19307176">
<aside class="page-sidebar">
<div class="inner-wrap">
<div class="full-text-links">
<div class="full-view">
<h3 class="title">
Full text links
</h3>
<div class="full-text-links-list">
<a class="link-item
dialog-focus"
href="https://linkinghub.elsevier.com/retrieve/pii/S0021-9258(20)58225-2"
target="_blank"
rel="noopener"
ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=False&amp;PrId=3048&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=19307176&amp;db=pubmed&amp;nlmid=2985121R"
title="See full text options at Elsevier Science"
data-ga-category="full_text"
data-ga-action="Elsevier Science"
data-ga-label="19307176"
><img src="https://cdn.ncbi.nlm.nih.gov/corehtml/query/egifs/https:--linkinghub.elsevier.com-ihub-images-elsevieroa.png" alt="Elsevier Science full text link"><span class="text">
Elsevier Science
</span></a><a class="link-item
pmc
"
href="https://pmc.ncbi.nlm.nih.gov/articles/pmid/19307176/"
target="_blank"
rel="noopener"
ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=True&amp;PrId=3494&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=19307176&amp;db=pubmed&amp;nlmid=2985121R"
title="Free full text at PubMed Central"
data-ga-category="full_text"
data-ga-action="PMC"
data-ga-label="19307176"
><span class="text">
Free PMC article
</span></a>
</div>
</div>
<div class="short-view">
<a href="#" class="full-text-links-button full-text-links-dialog-trigger">
Full text links
</a>
</div>
</div>
<div class="actions-buttons sidebar"><h3 class="title">Actions</h3><div class="inner-wrap"><button class="citation-button citation-dialog-trigger"
aria-label="Open dialog with citation text in different styles"
data-ga-category="save_share"
data-ga-action="cite"
data-ga-label="open"
data-all-citations-url="/19307176/citations/"
data-citation-style="nlm"
data-pubmed-format-link="/19307176/export/"><span class="button-label">Cite</span></button><link type="text/css" href="ncbi-overlay-block/src/overlay-block.css"><div class="collections-button-container" data-article-id="19307176" data-article-db="pubmed"><button class="collections-button collections-dialog-trigger"
aria-label="Save article in MyNCBI collections."
data-ga-category="collections_button"
data-ga-action="click"
data-ga-label="collections_button"
data-collections-open-dialog-enabled="false"
data-collections-open-dialog-url="https://account.ncbi.nlm.nih.gov/?back_url=https%3A%2F%2Fpubmed.ncbi.nlm.nih.gov%2F19307176%2F%23open-collections-dialog"
data-in-collections="false"><span class="button-label">Collections</span></button><div class="overlay" role="dialog"><div id="collections-action-dialog"
class="dialog collections-dialog"
aria-hidden="true"><div class="title">Add to Collections</div><div class="collections-action-panel action-panel"><form id="collections-action-dialog-form"
class="collections-action-panel-form action-panel-content action-form action-panel-smaller-selectors"
data-existing-collections-url="/list-existing-collections/"
data-add-to-existing-collection-url="/add-to-existing-collection/"
data-create-and-add-to-new-collection-url="/create-and-add-to-new-collection/"
data-myncbi-max-collection-name-length="100"
data-collections-root-url="https://www.ncbi.nlm.nih.gov/myncbi/collections/"><input type="hidden" name="csrfmiddlewaretoken" value="5NvyBCYCHkronwKu527a2tIPZgnZ9oTNmAfDesrYhVeShXQkIlKcwBetxk5b2Zr7"><div class="choice-group" role="radiogroup"><ul class="radio-group-items"><li><input type="radio"
id="collections-action-dialog-new"
class="collections-new"
name="collections"
value="new"
data-ga-category="collections_button"
data-ga-action="click"
data-ga-label="collections_radio_new"><label for="collections-action-dialog-new">Create a new collection</label></li><li><input type="radio"
id="collections-action-dialog-existing"
class="collections-existing"
name="collections"
value="existing"
checked="true"
data-ga-category="collections_button"
data-ga-action="click"
data-ga-label="collections_radio_existing"><label for="collections-action-dialog-existing">Add to an existing collection</label></li></ul></div><div class="controls-wrapper"><div class="action-panel-control-wrap new-collections-controls"><label for="collections-action-dialog-add-to-new" class="action-panel-label required-field-asterisk">
Name your collection:
</label><input
type="text"
name="add-to-new-collection"
id="collections-action-dialog-add-to-new"
class="collections-action-add-to-new"
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/"
maxlength="100"
data-ga-category="collections_button"
data-ga-action="create_collection"
data-ga-label="non_favorties_collection"><div class="collections-new-name-too-long usa-input-error-message selection-validation-message">
Name must be less than 100 characters
</div></div><div class="action-panel-control-wrap existing-collections-controls"><label for="collections-action-dialog-add-to-existing" class="action-panel-label">
Choose a collection:
</label><select id="collections-action-dialog-add-to-existing"
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Coexpression and heteromerization of two neuronal K-Cl cotransporter isoforms in neonatal brain
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data-ga-label="Claudio Rivera">Claudio Rivera</a><sup class="affiliation-links"><span class="author-sup-separator">&nbsp;</span><a class="affiliation-link" title="Institute of Biotechnology, University of Helsinki, Viikinkaari 9, 00014 Helsinki, Finland." href="#short-view-affiliation-2" ref="linksrc=author_aff">
2
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data-ga-label="Matti S Airaksinen">Matti S Airaksinen</a><sup class="affiliation-links"><span class="author-sup-separator">&nbsp;</span><a class="affiliation-link" title="Neuroscience Center, University of Helsinki, Viikinkaari 4, 00014 Helsinki, Finland. Electronic address: matti.airaksinen@helsinki.fi." href="#short-view-affiliation-5" ref="linksrc=author_aff">
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<li data-affiliation-id="short-view-affiliation-1"
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><sup class="key">1</sup> Neuroscience Center, University of Helsinki, Viikinkaari 4, 00014 Helsinki, Finland. Electronic address: pavel.uvarov@helsinki.fi.</li>
<li data-affiliation-id="short-view-affiliation-2"
id="short-view-affiliation-2"
><sup class="key">2</sup> Institute of Biotechnology, University of Helsinki, Viikinkaari 9, 00014 Helsinki, Finland.</li>
<li data-affiliation-id="short-view-affiliation-3"
id="short-view-affiliation-3"
><sup class="key">3</sup> Neuroscience Center, University of Helsinki, Viikinkaari 4, 00014 Helsinki, Finland.</li>
<li data-affiliation-id="short-view-affiliation-4"
id="short-view-affiliation-4"
><sup class="key">4</sup> Department of Clinical Chemistry, Friedrich-Schiller-Universität, D-07747 Jena, Germany.</li>
<li data-affiliation-id="short-view-affiliation-5"
id="short-view-affiliation-5"
><sup class="key">5</sup> Neuroscience Center, University of Helsinki, Viikinkaari 4, 00014 Helsinki, Finland. Electronic address: matti.airaksinen@helsinki.fi.</li>
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<h2 class="title">
Abstract
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<p>
The neuron-specific K-Cl cotransporter KCC2 maintains the low intracellular chloride concentration required for the fast hyperpolarizing actions of inhibitory neurotransmitters. The KCC2 gene codes for two isoforms, KCC2a and KCC2b, which differ in their N termini. The relative expression and cellular distribution of the two KCC2 protein isoforms are unknown. Here, we characterize an antibody against the KCC2a isoform and show that a previously described antibody against KCC2 is specific for the KCC2b isoform (Hubner, C. A., Stein, V., Hermans-Borgmeyer, I., Meyer, T., Ballanyi, K., and Jentsch, T. J. (2001) Neuron 30, 515-524). Immunostaining of dissociated hippocampal cultures confirms that both KCC2 isoforms are neuron-specific. Immunoblot analysis indicates that KCC2b is the major KCC2 isoform in the adult brain, whereas in the neonatal mouse central nervous system, half of total KCC2 protein is KCC2a. At this stage, the two KCC2 isoforms are largely colocalized and show similar patterns of distribution in the brain. When coexpressed in HEK293 cells, KCC2a and KCC2b proteins form heteromeric complexes. Moreover, the two isoforms can be coimmunoprecipitated from the neonatal brain, suggesting the presence of endogenous KCC2a-KCC2b heteromers. Consistent with this, native gel analysis shows that a substantial part of endogenous KCC2 isoforms in the neonatal brain constitute dimers.
</p>
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<div class="figures" id="figures">
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Figures
</h2>
<div class="figures-list" id="slides-container"
itemscope itemtype="http://schema.org/ImageGallery">
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="0"
data-label-slug="figure-1">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/deea/2679471/ad0f4c641c08/zbc0250976800001.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-0"
role="button"
data-image-width="498"
data-image-height="400"
data-image-alt="FIGURE 1."
data-pmc-id="PMC2679471"
data-figure-id="fig1">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-0"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/deea/2679471/f2a6a6652663/zbc0250976800001.gif"
alt="FIGURE 1." />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="498">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="400">
<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> FIGURE 1. </p>
</strong>
<div class="figure-caption-contents"><b> Specific antibodies against the KCC2a… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 1. </p>
</strong>
<div class="figure-caption-contents"><b> Specific antibodies against the KCC2a and KCC2b isoforms. </b> <i> A </i> , whole-brain lysates obtained…</div>
</div>
<figcaption id="figure-caption-0" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
FIGURE 1.
</strong>
<div class="figure-caption-contents"><b>Specific antibodies against the KCC2a and KCC2b isoforms.</b>
<i>A</i>, whole-brain lysates obtained from P2 mice were analyzed by
standard SDS-PAGE and immunoblotting (<i>IB</i>) with affinity-purified
KCC2a antiserum (see “Experimental Procedures”). The KCC2a
antiserum (diluted 1: 2000) detects a major product of 140 kDa
(<i>arrowhead</i>, corresponding to KCC2a monomer), and occasionally
(<i>cf. B</i>), a minor band of 200 kDa. A similar, higher molecular
mass band observed with other KCC2 antibodies was suggested to represent the
interaction of KCC2 with other proteins
(28). These bands are not
observed when the antiserum is preadsorbed with 1 μg/ml immunizing peptide.
As a control, the membrane was reblotted with an antibody against GAPDH.
<i>B</i>, whole-brain lysates of embryonic day 17.5 (E17) wild-type (WT)
mice and their KCC2 null mutant (<i>KO</i>) littermates were analyzed as
above. The KCC2a antiserum detected the expected product of 140 kDa from
the WT but not from the KO lysate. <i>C</i>, lysates of HEK293 cells,
transiently transfected with KCC2a or KCC2b expression plasmids, were analyzed
as above with KCC2a, KCC2b, or KCC2pan antibodies (see “Experimental
Procedures”). The KCC2a antiserum detected a product of 140 kDa
from lysates of HEK293 cells transfected with the KCC2a plasmid but not with
the KCC2b expression vector. Similarly, the KCC2b antiserum stained a product
of 140 kDa from lysates of KCC2b-expressing but not KCC2a-expressing
cells. The KCC2b antibody was raised against a 15-amino-acid peptide
corresponding to the N terminus of the KCC2b isoform
(11). Because the last five
amino acids in the peptide are common to both KCC2 isoforms, the specificity
of the antibody for the KCC2b isoform is notable.</div>
</figcaption>
</figure>
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="1"
data-label-slug="figure-2">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/deea/2679471/f39c2700c094/zbc0250976800002.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-1"
role="button"
data-image-width="456"
data-image-height="418"
data-image-alt="FIGURE 2."
data-pmc-id="PMC2679471"
data-figure-id="fig2">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-1"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/deea/2679471/7c79aa044a16/zbc0250976800002.gif"
alt="FIGURE 2." />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="456">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="418">
<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> FIGURE 2. </p>
</strong>
<div class="figure-caption-contents"><b> CNS-specific expression of KCC2a protein… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 2. </p>
</strong>
<div class="figure-caption-contents"><b> CNS-specific expression of KCC2a protein in adult mouse tissues. </b> Equal amounts (20 μg)…</div>
</div>
<figcaption id="figure-caption-1" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
FIGURE 2.
</strong>
<div class="figure-caption-contents"><b>CNS-specific expression of KCC2a protein in adult mouse tissues.</b>
Equal amounts (20 μg) of total protein lysates obtained from different CNS
regions, as well as from several non-neural tissues of adult (48-week-old)
mice, were subjected to standard immunoblotting (<i>IB</i>) procedure with
the KCC2a antibody. A product of 140 kDa was detected in all CNS but not
in non-neural tissues. Similar results were obtained in two independent
experiments.</div>
</figcaption>
</figure>
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="2"
data-label-slug="figure-3">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/deea/2679471/8622fd73d672/zbc0250976800003.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-2"
role="button"
data-image-width="456"
data-image-height="1136"
data-image-alt="FIGURE 3."
data-pmc-id="PMC2679471"
data-figure-id="fig3">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-2"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/deea/2679471/cc10ecdb2f61/zbc0250976800003.gif"
alt="FIGURE 3." />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="456">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="1136">
<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> FIGURE 3. </p>
</strong>
<div class="figure-caption-contents"><b> Although total KCC2 expression is… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 3. </p>
</strong>
<div class="figure-caption-contents"><b> Although total KCC2 expression is increased in the cortex during postnatal development, KCC2a… </b></div>
</div>
<figcaption id="figure-caption-2" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
FIGURE 3.
</strong>
<div class="figure-caption-contents"><b>Although total KCC2 expression is increased in the cortex during
postnatal development, KCC2a levels remain constant.</b> <i>A</i>, equal
amounts (20 μg) of total protein lysates obtained from brainstems,
cortices, and spinal cords of P2 or adult (48-week-old) mice were analyzed by
standard SDS-PAGE and detected sequentially with the KCC2a (<i>upper
panel</i>) and KCC2pan (<i>middle panel</i>) antibodies. A protein of 140
kDa, close to the predicted molecular mass for KCC2a, was observed in all
samples analyzed. <i>IB</i>, immunoblot. <i>B</i>, shown is the result of
quantification of four independent experiments, one of which is presented in
<i>A</i>. Expression of KCC2a in the mouse brainstem and spinal cord was
about 2-fold higher in P2 than in adult mice. By contrast, KCC2a expression in
the cortex was about 2-fold lower in P2 than in adult mice. Values are mean
± S.E. (<i>error bars</i>) of four independent experiments.
<i>C</i>, total KCC2 expression (detected with KCC2pan antibody) was
dramatically up-regulated in the cortex between P2 and adulthood but increased
only moderately in the brainstem. In the spinal cord, total KCC2 expression
did not change significantly between the P2 and adult time points. Values are
mean ± S.E. (<i>error bars</i>) of four independent experiments.</div>
</figcaption>
</figure>
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="3"
data-label-slug="figure-4">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/deea/2679471/0843c41d2564/zbc0250976800004.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-3"
role="button"
data-image-width="498"
data-image-height="510"
data-image-alt="FIGURE 4."
data-pmc-id="PMC2679471"
data-figure-id="fig4">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-3"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/deea/2679471/12fc73929182/zbc0250976800004.gif"
alt="FIGURE 4." />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="498">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="510">
<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> FIGURE 4. </p>
</strong>
<div class="figure-caption-contents"><b> KCC2a contributes at least half… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 4. </p>
</strong>
<div class="figure-caption-contents"><b> KCC2a contributes at least half of the total KCC2 protein in the neonatal… </b></div>
</div>
<figcaption id="figure-caption-3" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
FIGURE 4.
</strong>
<div class="figure-caption-contents"><b>KCC2a contributes at least half of the total KCC2 protein in the
neonatal mouse, whereas KCC2b is the predominant isoform in the adult
brain.</b> <i>A</i>, equal amounts (20 μg) of total protein lysates
obtained from spinal cords and different brain regions of P2 or adult
(48-week-old) mice were analyzed in parallel with KCC2a protein standards by
immunoblotting. Membrane was first immunoblotted (<i>IB</i>) with the KCC2a
antibody (<i>upper panel</i>), stripped, and then processed with KCC2pan
(<i>middle panel</i>) antibody. GAPDH expression in the samples is shown as
a loading control (<i>lower panel</i>). <i>B</i>, relative (percentage)
contribution of KCC2a to total KCC2 protein expression in different CNS
regions of neonatal (P2) and adult mice. Shown is the result of quantification
of five independent experiments, one of which is presented in <i>A</i>. Band
intensities of the 140-kDa protein product, corresponding to the
predicted molecular mass for KCC2a and KCC2b, were measured, and the ratio of
KCC2a to total KCC2 was calculated by using standard curves (<i>panel C</i>,
see “Experimental Procedures”). KCC2a contributes about
5065% of the total KCC2 expression in the neonatal mouse brainstem
(<i>Bs</i>), cortex (<i>Cx</i>), and spinal cord (<i>Sp</i>). By
contrast, KCC2a is a minor KCC2 isoform in the adult CNS; the percentage of
KCC2a of the total KCC2 ranges from 4% in the cerebellum (<i>Cb</i>) to
1718% in the brainstem and spinal cord. Intermediate values are seen in
the cortex (8%), hippocampus (<i>Hc</i>, 10%), and olfactory bulb
(<i>Ob</i>, 11%). Values are mean ± S.E. (<i>error bars</i>) of
five independent experiments. <i>C</i>, standard curves for the KCC2a and
KCC2pan antibodies were made by plotting the concentration of the KCC2a
standard (= different dilutions, from undiluted up to 1/20, of a
KCC2a-expressing HEK293 cell lysate) on the <i>x</i> axis and the measured
band intensities on the <i>y</i> axis and then fitting a line to the
data.</div>
</figcaption>
</figure>
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="4"
data-label-slug="figure-5">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/deea/2679471/3edd842379c1/zbc0250976800005.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-4"
role="button"
data-image-width="456"
data-image-height="818"
data-image-alt="FIGURE 5."
data-pmc-id="PMC2679471"
data-figure-id="fig5">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-4"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/deea/2679471/84acacf2027b/zbc0250976800005.gif"
alt="FIGURE 5." />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="456">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="818">
<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> FIGURE 5. </p>
</strong>
<div class="figure-caption-contents"><b> Localization of the KCC2a isoform… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 5. </p>
</strong>
<div class="figure-caption-contents"><b> Localization of the KCC2a isoform in cultured neurons. </b> Shown are maximum intensity projections…</div>
</div>
<figcaption id="figure-caption-4" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
FIGURE 5.
</strong>
<div class="figure-caption-contents"><b>Localization of the KCC2a isoform in cultured neurons.</b> Shown are
maximum intensity projections of confocal optical images. <i>A</i>,
hippocampal neurons, derived from E17 WT or KCC2 null mutant (<i>KO</i>)
mice and cultured for 11 days <i>in vitro</i> (DIV11), were
double-immunostained (see “Experimental Procedures”) with
antibodies against KCC2a (<i>red</i>) and neuron-specific β-III tubulin
(TUJ-1) (<i>green</i>). WT and KO cultures were treated in parallel, and the
same settings were applied during the imaging procedures, thus allowing a
direct comparison of the KCC2a staining in WT and KO neurons. KCC2a antibody
revealed a strong KCC2a protein expression in WT neurons, whereas only
residual background staining was found in KO neurons. <i>B</i>, DIV11
hippocampal cultures from WT mice were double-stained with antibodies against
KCC2a (<i>red</i>) and GFAP (<i>green</i>). Non-overlapping patterns
revealed by these antibodies confirmed an exclusively neuron-specific
expression of the KCC2a protein. <i>C</i>, mouse hippocampal neuronal
cultures, prepared similar to <i>A</i> and cultured for 5 or 19 days, were
double-immunostained with KCC2a (<i>red</i>) and TUJ-1 (<i>green</i>)
antibodies. KCC2a expression was exclusively neuronal at all time points
analyzed. KCC2a immunostaining was present in cell bodies and dendritic shafts
already at DIV5 and remained similar in DIV19 neurons. <i>Scale bar</i> is
10 μmin <i>A</i> and <i>B</i> and 20 μmin <i>C</i>.</div>
</figcaption>
</figure>
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="5"
data-label-slug="figure-6">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/deea/2679471/64617984ac08/zbc0250976800006.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-5"
role="button"
data-image-width="498"
data-image-height="936"
data-image-alt="FIGURE 6."
data-pmc-id="PMC2679471"
data-figure-id="fig6">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-5"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/deea/2679471/17d02a9030b6/zbc0250976800006.gif"
alt="FIGURE 6." />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="498">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="936">
<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> FIGURE 6. </p>
</strong>
<div class="figure-caption-contents"><b> KCC2a and KCC2b protein isoforms… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 6. </p>
</strong>
<div class="figure-caption-contents"><b> KCC2a and KCC2b protein isoforms have a similar pattern of expression in E18… </b></div>
</div>
<figcaption id="figure-caption-5" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
FIGURE 6.
</strong>
<div class="figure-caption-contents"><b>KCC2a and KCC2b protein isoforms have a similar pattern of expression in
E18 mouse brain.</b> Sagittal (<i>AD</i>) or coronal
(<i>EH</i>) cryosections of E18 WT (<i>A</i>, <i>C</i>, and
<i>EH</i>) or KCC2 null mutant (<i>KO</i>, <i>B</i> and
<i>D</i>) mice were analyzed by immunohistochemistry (see
“Experimental Procedures”) with KCC2a (<i>A</i>, <i>B</i>,
<i>E</i>, and <i>G</i>), KCC2pan (<i>C</i> and <i>D</i>), and KCC2b
(<i>F</i> and <i>H</i>) antibodies. Immunoreactivity for KCC2a was widely
distributed in non-cortical brain areas (<i>A</i>) of wild-type mice and was
absent in the KCC2 null mutant littermates (<i>B</i>). The KCC2pan antibody
produced a pattern similar to KCC2a antibody in wild-type mice (<i>C</i>)
and no staining in sections from KCC2 null mutant embryos (<i>D</i>).
Immunostaining of adjacent sections with the KCC2a and KCC2b antibodies
revealed a similar distribution of the two KCC2 isoforms in the olfactory bulb
(compare <i>E</i> and <i>F</i>) and thalamus (compare <i>G</i> and
<i>H</i>). All three KCC2 antibodies detected only a weak signal in the
cerebral cortex and hippocampus. The signal in the skin (asterisk in
<i>A</i> and <i>G</i>) was unspecific. <i>Cb</i>, cerebellum;
<i>Cx</i>, neocortex; <i>Hc</i>, hippocampus; <i>Hy</i>, hypothalamus;
<i>Me</i>, medulla; <i>Ob</i>, olfactory bulb; <i>Th</i>, thalamus.
<i>Scale bar</i> is 1 m min <i>AD</i>; 0.5 mm in <i>E</i> and
<i>F</i>, and 0.2 mm in <i>G</i> and <i>H</i>.</div>
</figcaption>
</figure>
<figure class="figure-item tail"
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="6"
data-label-slug="figure-7">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/deea/2679471/03e4e9507ad2/zbc0250976800007.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-6"
role="button"
data-image-width="498"
data-image-height="218"
data-image-alt="FIGURE 7."
data-pmc-id="PMC2679471"
data-figure-id="fig7">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-6"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/deea/2679471/b6f72d6e19b0/zbc0250976800007.gif"
alt="FIGURE 7." />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="498">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="218">
<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> FIGURE 7. </p>
</strong>
<div class="figure-caption-contents"><b> KCC2a and KCC2b are colocalized… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 7. </p>
</strong>
<div class="figure-caption-contents"><b> KCC2a and KCC2b are colocalized in E18 mouse brain neurons. </b> Shown are confocal…</div>
</div>
<figcaption id="figure-caption-6" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
FIGURE 7.
</strong>
<div class="figure-caption-contents"><b>KCC2a and KCC2b are colocalized in E18 mouse brain neurons.</b> Shown
are confocal optical section images of a coronal cryosection through E18 mouse
midbrain double-stained with the KCC2a (<i>green</i>) and KCC2b
(<i>red</i>) antibodies (see “Experimental Procedures”).
<i>C</i> is the merged image of <i>A</i> and <i>B.</i> Most neurons in
this area coexpress KCC2a and KCC2b, although the distribution is not
identical. <i>4V</i>, fourth ventricle. <i>Scale bar</i> is 50 μm.</div>
</figcaption>
</figure>
<figure class="figure-item tail"
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="7"
data-label-slug="figure-8">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/deea/2679471/86653b80fed5/zbc0250976800008.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-7"
role="button"
data-image-width="456"
data-image-height="820"
data-image-alt="FIGURE 8."
data-pmc-id="PMC2679471"
data-figure-id="fig8">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-7"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/deea/2679471/9e0ba60c83f3/zbc0250976800008.gif"
alt="FIGURE 8." />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="456">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="820">
<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> FIGURE 8. </p>
</strong>
<div class="figure-caption-contents"><b> KCC2a can interact with KCC2b… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 8. </p>
</strong>
<div class="figure-caption-contents"><b> KCC2a can interact with KCC2b <i> in vitro </i> . </b> HEK293 cells were transfected with…</div>
</div>
<figcaption id="figure-caption-7" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
FIGURE 8.
</strong>
<div class="figure-caption-contents"><b>KCC2a can interact with KCC2b <i>in vitro</i>.</b> HEK293 cells were
transfected with the indicated plasmids and lysed 48 h later. <i>A</i> and
<i>B</i>, the lysates were immunoprecipitated (<i>IP</i>) with the
indicated antibodies and analyzed for interacting partners using standard
SDS-PAGE and immunoblotting (<i>IB</i>). <i>A</i>, after precipitation
with the KCC2a antibody, immunoblotting with the KCC2b antibody detected a
band of 140 kDa (corresponding to KCC2b) from cells coexpressing KCC2a
and KCC2b but not from the combined lysate of cells expressing KCC2a and KCC2b
separately (<i>upper panel</i> of IP:KCC2a part). Immunoblotting with the
SPAK antibody confirmed that KCC2a is able to interact with SPAK (<i>lower
panel</i> of IP: KCC2a part). Analysis of the lysates (<i>Input</i>)
ensured that the proteins were successfully expressed. <i>B</i>, after
precipitation with an anti-Myc antibody, immunoblotting with the KCC2a
antibody detected a band corresponding to KCC2a from cells coexpressing KCC2a
and Myc-KCC2b fusion construct but not from the combined lysate of cells
expressing KCC2a and Myc-KCC2b separately (<i>upper panel</i> of IP:Myc
part). Expression of KCC2a in the cell lysates is also shown (<i>Input</i>).
For simplicity, only the monomer bands of KCC2 are shown in <i>A</i> and
<i>B</i>. <i>C</i>, the lysates were separated in native PFO gel and
analyzed by immunoblotting sequentially with KCC2pan (<i>left panel</i>) and
KCC2a (<i>right panel</i>) antibodies. Bands corresponding to the expected
size of monomeric (<i>band 1</i>) and homo-oligomeric (<i>band
24</i>) forms of KCC2a are <i>numbered</i>. The corresponding bands
for the GFP-KCC2b fusion protein are larger due to the additional GFP moiety
(30 kDa). Bands corresponding to the expected size of hetero-oligomers
between KCC2a and GFP-KCC2b (marked by <i>arrows</i>) are seen between the
KCC2a and GFP-KCC2b homo-oligomeric bands, and they appear more prominent in
the <i>left</i> than in the <i>right panel</i> because the KCC2pan
antibody can bind both KCC2a and GFP-KCC2b in the hetero-oligomers.</div>
</figcaption>
</figure>
<figure class="figure-item tail"
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="8"
data-label-slug="figure-9">
<a class="figure-link"
href="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/deea/2679471/9b764612b3d5/zbc0250976800009.jpg"
itemprop="contentUrl"
aria-describedby="figure-caption-8"
role="button"
data-image-width="456"
data-image-height="700"
data-image-alt="FIGURE 9."
data-pmc-id="PMC2679471"
data-figure-id="fig9">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-8"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/deea/2679471/1357803cc27f/zbc0250976800009.gif"
alt="FIGURE 9." />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="456">
<meta itemprop="height" itemtype="http://schema.org/ImageObject" content="700">
<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
<div class="caption-wrap">
<strong class="figure-label">
<p> FIGURE 9. </p>
</strong>
<div class="figure-caption-contents"><b> The two KCC2 isoforms form… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 9. </p>
</strong>
<div class="figure-caption-contents"><b> The two KCC2 isoforms form dimers and interact with each other <i> in vivo… </i> </b></div>
</div>
<figcaption id="figure-caption-8" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
FIGURE 9.
</strong>
<div class="figure-caption-contents"><b>The two KCC2 isoforms form dimers and interact with each other <i>in
vivo</i>.</b> <i>A</i>, native PFO-PAGE analysis of protein complexes
present in neonatal (P2) mouse brain lysates (see “Experimental
Procedures”). Immunoblotting (<i>IB</i>) with antibodies to KCC2a and
KCC2b (directed against their unique N termini) indicates that a substantial
part of both KCC2 isoforms exists as dimers in the neonatal brain. Note that
the relative amount of KCC2 dimers <i>versus</i> monomers appears to be
higher when detected with the KCC2pan antibody (directed against the common C
terminus). <i>B</i>, the same sample as in <i>A</i>, but 0.5% SDS was
included in the sample 20 min before loading to PFO-PAGE. <i>C</i>, a lysate
of E18 rat brainstem was subjected to coIP with the KCC2a or a control
antibody (normal rabbit IgG), and the precipitate was analyzed by
immunoblotting with the KCC2b antibody. A band of 140 kDa, corresponding to
the KCC2b, was detected in the sample after coIP with KCC2a but not with the
control antibody.</div>
</figcaption>
</figure>
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