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<h2 class="element-invisible">You are here</h2><div class="breadcrumb"><a href="/">Home</a> » <a href="/news-events">News & Events</a> » <a href="/news-events/nih-research-matters">NIH Research Matters</a></div> <div class="l-region l-region--section-header">
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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2017-05-12T00:00:00-04:00" class="date-display-single">May 12, 2017</span></p><div class='syndicate'><h1>3-D model of human brain development and disease</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<li>Researchers created a 3-D model of the interactions between developing brain regions—in a dish.</li>
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<li>Using the model, the team looked at how mutations that cause Timothy syndrome affect brain development and discovered a defect in how neurons migrate between regions.</li>
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<li>The results suggest a way to study personalized brain development and disease.</li>
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<picture title="Fused forebrain spheroids">
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<!--[if IE 9]><video style="display: none;"><![endif]-->
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2017/20170509-forebrain_0.jpg?itok=y7mNCnsc&timestamp=1513696373 1x" media="screen and (min-width: 960px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2017/20170509-forebrain_0.jpg?itok=4ieFobD6&timestamp=1513696373 1x" media="screen and (min-width: 800px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium-small/public/news-events/research-matters/2017/20170509-forebrain_0.jpg?itok=hxCqzOEt&timestamp=1513696373 1x" media="screen and (min-width: 600px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-small/public/news-events/research-matters/2017/20170509-forebrain_0.jpg?itok=GVhYtLAW&timestamp=1513696373 1x" media="screen and (min-width: 480px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-tiny/public/news-events/research-matters/2017/20170509-forebrain_0.jpg?itok=4j2Jk2tM&timestamp=1513696373 1x" media="screen and (min-width: 0)" />
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<!--[if IE 9]></video><![endif]-->
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2017/20170509-forebrain_0.jpg?itok=4ieFobD6&timestamp=1513696373" alt="Fused forebrain spheroids" title="Fused forebrain spheroids" />
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</picture><span class="caption">After spheroids representing two different brain regions fuse in a dish, neurons from one spheroid (green) migrate into the other and forge connections with the neurons there.</span><span class="credit">Pasca lab, Stanford University</span></div>
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</div><p>Brain development is a complicated process. During mid-to-late gestation, neurons migrate from deep brain structures and organize themselves into the tissues that will become the human cerebral cortex—the outer layer of the brain and seat of higher-order mental functions. The brain is especially vulnerable during this building process. Glitches in this period are thought to set the stage for autism, schizophrenia, and other neurodevelopmental brain disorders.</p>
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||
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||
<p>An autism-related disorder called Timothy syndrome is caused by mutations in the <em>CACNA1C</em> gene, which codes for the Ca<sub>V</sub>1.2 calcium channel. The function of these channels is to transport calcium ions into cells. The altered channels stay open much longer than usual, which allows calcium ions to continue flowing into cells abnormally. Calcium ions are involved in many different functions during development, including cell-to-cell communication and migration.</p>
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||
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||
<p>To study prenatal brain development and how such genetic mutations disrupt the process, a team led by Dr. Sergiu Pasca at Stanford University created a miniaturized brain model by directing human stem cells in a dish to become neurons and form 3-D brain organoids or brain-region “spheroids.” The studies were partially funded by NIH’s National Institute of Mental Health (NIMH). Results were published in the May 4, 2017, issue of <em>Nature. </em></p>
|
||
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||
<p>The team coaxed 3-D cell cultures to acquire the characteristics of two specific regions of the forebrain (dorsal and ventral) during early development. The two types of spheroids fused together when placed near each other, simulating the stage of development when neurons begin migrating from deep regions of the forebrain toward the cerebral cortex.</p>
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||
<p>Using live-cell imaging, the team tracked neuronal migrations. Neurons from the spheroids resembling tissue in the deep forebrain region, which produced the neurotransmitter GABA (GABAergic neurons), migrated toward and formed connections with the neurons from the spheroids resembling tissue in the outer region, which produced glutamate (glutamatergic neurons). This miniature model mimicked the maturation of the human forebrain by creating neural circuits with both GABAergic and glutamatergic neurons. GABAergic neurons dampen neural activity, while glutamatergic neurons stimulate neural activity.</p>
|
||
|
||
<p>In brain spheroids derived from skin cells of patients with Timothy syndrome, the researchers discovered a defect in the migration of the GABAergic neurons. The neurons moved more frequently but less efficiently. The scientists could experimentally correct this problem with drugs that reduce the activity of Ca<sub>v</sub>1.2 channels.</p>
|
||
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||
<p>“The exquisite timing and placement of these different neuron cell types is critical for establishing a balance between excitation and inhibition within brain circuits. This balance is thought to be disrupted in brain disorders,” explains Dr. David Panchision, chief of the NIMH program that supports the project. “Re-playing these developmental processes with a patient’s own cells can allow us to determine what distinguishes these different disorders at a molecular and cellular level.”</p>
|
||
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||
<p>“[This] recapitulation of a pivotal stage in the cortex’s formation demonstrates the technique’s promise for discovery—and even for testing potential interventions,” says NIMH Director Dr. Joshua Gordon. “It moves us closer to realizing the goal of precision medicine for brain disorders.”</p>
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</div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="https://www.nih.gov/news-events/news-releases/patients-budding-cortex-dish" target="_top">A Patient’s Budding Cortex — in a dish?</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/brain-circuits-start-stop-action" target="_top">Brain Circuits Start and Stop the Action</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/3-d-cell-placenta-model-mimics-development-microbial-resistance" target="_top">3-D Cell Placenta Model Mimics Development, Microbial Resistance</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/stem-cells-form-light-sensitive-3-d-retinal-tissue" target="_top">Stem Cells Form Light-Sensitive 3-D Retinal Tissue</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/engineering-cartilage" target="_top">Engineering Cartilage</a></li><li><a href="https://ghr.nlm.nih.gov/condition/timothy-syndrome" target="_top">Timothy Syndrome </a></li><li><a href="https://www.nimh.nih.gov/health/educational-resources/brain-basics/brain-basics.shtml" target="_top">Brain Basics</a></li><li><a href="https://www.braininitiative.nih.gov/" target="_top">BRAIN Initiative</a></li><li><a href="https://www.youtube.com/watch?v=mqt-8qdoDj0" target="_top">iPS Cells & Organoids - Sci-Fi vs Reality (Video)</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://www.ncbi.nlm.nih.gov/pubmed/28445465">Assembly of functionally integrated human forebrain spheroids.</a> Birey F, Andersen J, Makinson CD, Islam S, Wei W, Huber N, Fan HC, Metzler KRC, Panagiotakos G, Thom N, O'Rourke NA, Steinmetz LM, Bernstein JA, Hallmayer J, Huguenard JR, Paşca SP. <em>Nature</em>. 2017 May 4;545(7652):54-59. doi: 10.1038/nature22330. Epub 2017 Apr 26. PMID: 28445465.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Institute of Mental Health (NIMH) and National Human Genome Research Institute (NHGRI); the California Institute of Regenerative Medicine; the MQ Fellow Award; the Donald E. and Delia B. Baxter Foundation Faculty Award; the Kwan Research Fund; Stanford Start-up Funds; Child Research Health Institute Postdoctoral Fellowship; Walter V. and Idun Berry Postdoctoral Fellowship; the Stanford Medicine Dean’s Fellowship; the American Epilepsy Society; Wishes for Elliott Foundation Fellowship; UCSF Program for Breakthrough Biomedical Research; and the Sandler Foundation.</p>
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