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Six teams seek to identify biological factors that influence neural regeneration
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<span>Six teams seek to identify biological factors that influence neural regeneration </span>
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NIH to award $12.4 million over three years as part of audacious effort to reverse blindness
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September 1, 2016
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<img src="https://www.nei.nih.gov/sites/default/files/styles/small/public/news/neural_activity_retina.jpg?itok=vXAXO_Uz" alt="Artist's rendering of neural activity in the retina. Light that enters the eye activates rod and cone photoreceptors, which in turn activate retinal ganglion cells. Signals travel to the brain via retinal ganglion cell axons. Photo credit: National Eye Institute." width="248" height="203">
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<p>Artist’s rendering of neural activity in the retina. Light that enters the eye activates rod and cone photoreceptors, which then activates retinal ganglion cells. A signal travels to the brain via the retinal ganglion cell axons. Photo credit: National Eye Institute</p>
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<p>The National Institutes of Health will fund six projects to identify biological factors that affect neural regeneration in the retina. The projects are part of the National Eye Institute (NEI) Audacious Goals Initiative (AGI), a targeted effort to restore vision by regenerating neurons and their connections in the eye and visual system. These projects will receive a total of $12.4 million over three years, pending availability of funds.</p><p>“Understanding factors that mediate the regeneration of neurons and the growth of axons is crucial for the development of breakthrough therapies for blinding diseases. What we learn through these projects will have a health impact beyond vision,” said Paul A. Sieving, M.D., Ph.D., director of NEI, part of NIH.</p><p>Most irreversible blindness results from the loss of neurons in the retina, which is the light-sensitive tissue in the back of the eye. Many common eye diseases, including age-related macular degeneration, glaucoma and diabetic retinopathy, put these cells at risk. Once these neurons are gone, humans have little if any capacity to replace them.</p><p>These six projects will add to the knowledge base from several recent key advances. Researchers <a href="/about/news-and-events/news/use-it-or-lose-it-visual-activity-regenerates-neural-connections-between-eye-and-brain">recently reported a technique</a> that increases the regenerative capacity of retinal axons in a mouse model of optic nerve injury, a model commonly used to study glaucoma and other optic neuropathies. Progress also has been made in identifying factors that either stimulate or inhibit regeneration of neurons required for vision. The newly-funded projects will further this area of research by identifying cues that guide axons to appropriate targets in the brain, allowing functional connections to re-establish between the eye and the visual processing system.</p><p>The six projects include:</p>
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<div class="c-section" id="section-id-13975">
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<h3 class="c-section__heading">
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Molecular discovery for optic nerve regeneration (EY027261-01)
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</h3>
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<div class="c-image c-image--has-caption c-image--left">
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<div class="c-image__src">
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<img src="https://www.nei.nih.gov/sites/default/files/styles/small/public/2019-06/Huberman_Goldberg.png?itok=nJ8ZqtW3" alt="Two men in suits look at the camera" width="220" height="142">
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</div>
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<div class="c-image__caption">
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<p>Andrew D. Huberman, Ph.D., and Jeffrey L. Goldberg, M.D., Ph.D.</p>
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</div>
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<p><em>Principal investigators: Jeffrey L. Goldberg, M.D., Ph.D., Andrew D. Huberman, Ph.D., Stanford University, Palo Alto, California; Larry Benowitz, Ph.D., Harvard University, Cambridge, Massachusetts; Hollis Cline, Ph.D., Scripps Research Institute, La Jolla, California</em></p><p>Goldberg and colleagues have demonstrated through a series of interventions in mice with optic nerve injury that they can successfully regenerate retinal ganglion cells axons, which form the optic nerve that transmits visual information from the retina to the brain. In this next research phase they hope to identify genes and proteins that help or hinder this ability of retinal ganglion cells to regenerate, grow axons to a target and become functional in mice. Promising molecular candidates will be investigated in longer-term animal studies designed to assess changes in the animals’ vision.</p>
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</div>
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<div class="c-section" id="section-id-13978">
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<h3 class="c-section__heading">
|
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Screening for molecules that promote photoreceptor synaptogenesis (EY027266-01)
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</h3>
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<div class="c-image c-image--has-caption c-image--left">
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<div class="c-image__src">
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<img src="https://www.nei.nih.gov/sites/default/files/styles/small/public/2019-06/don_dave.png?itok=IaAn_luy" alt="Two men chatting in a lab" width="220" height="166">
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</div>
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<div class="c-image__caption">
|
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<p>Donald J. Zack, M.D., Ph.D., and David Gamm, M.D., Ph.D.</p>
|
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</div>
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</div>
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<div class="c-text">
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<p><em>Principal investigators: Donald J. Zack, M.D., Ph.D., Johns Hopkins University, Baltimore; David Gamm, M.D., Ph.D., University of Wisconsin, Madison</em></p><p>Zack, Gamm, and their teams plan to study precursor photoreceptor cells derived from human stem cells to determine what factors help coax them into becoming fully developed and connected photoreceptor cells. They expect their studies to identify a list of small molecules and candidate genes that contribute to the ability of photoreceptor cells to home in on their appropriate target cells in the retina, known as bipolar cells. In a healthy eye, bipolar cells receive signals from photoreceptor cells across a synapse and then transmit this information either directly or indirectly to retinal ganglion cells. Generating appropriate synapses between photoreceptor and bipolar cells is an essential step in restoring vision through photoreceptor transplantation.</p>
|
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</div>
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</div>
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<div class="c-section" id="section-id-13981">
|
||
<h3 class="c-section__heading">
|
||
|
||
|
||
|
||
|
||
Evaluation of novel targets for retinal ganglion cell axon regeneration (EY027256-01)
|
||
|
||
|
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</h3>
|
||
|
||
|
||
|
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|
||
|
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<div class="c-image c-image--has-caption c-image--left">
|
||
<div class="c-image__src">
|
||
<img src="https://www.nei.nih.gov/sites/default/files/styles/small/public/2019-06/stephen_0.png?itok=GFsRZ-ZR" alt="Man laughing" width="168" height="220">
|
||
</div>
|
||
<div class="c-image__caption">
|
||
|
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|
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|
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|
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<p>Stephen M. Strittmatter, M.D., Ph.D.</p>
|
||
|
||
|
||
</div>
|
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</div>
|
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|
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<div class="c-text">
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||
<p><em>Principal investigator: Stephen M. Strittmatter, M.D., Ph.D., Yale University, New Haven, Connecticut</em></p><p>Strittmatter and his team also are searching for genes that contribute to the regeneration of axons from retinal ganglion cells. Starting with 450 candidate genes, culled from more than 17,000, they will test each candidate in a mouse optic nerve injury model, to see if any act as mediators of regeneration. Positive genes will then be validated by looking to see if they are also active in the C. elegans worm, an indication that a gene’s function is preserved across species. The strongest gene candidates will then be analyzed in greater detail to better understand their molecular action.</p>
|
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</div>
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</div>
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<div class="c-section" id="section-id-13984">
|
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<h3 class="c-section__heading">
|
||
|
||
|
||
|
||
|
||
Novel activators of regeneration in Muller glia (EY027265-01)
|
||
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|
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</h3>
|
||
|
||
|
||
|
||
|
||
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<div class="c-image c-image--has-caption c-image--left">
|
||
<div class="c-image__src">
|
||
<img src="https://www.nei.nih.gov/sites/default/files/styles/small/public/2019-06/ed_0.png?itok=XDXOOs1c" alt="Man in glasses looks at the camera" width="220" height="139">
|
||
</div>
|
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<div class="c-image__caption">
|
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|
||
|
||
|
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|
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<p>Edward M. Levine, Ph.D.</p>
|
||
|
||
|
||
</div>
|
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</div>
|
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|
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<div class="c-text">
|
||
|
||
|
||
|
||
|
||
<p><em>Principal investigators: Edward M. Levine, Ph.D.; James G. Patton, Ph.D.; David J. Calkins, Ph.D. Vanderbilt University School of Medicine, Nashville, Tennessee</em></p><p>Levine and his colleagues are investigating exogenous and endogenous factors—that is, factors with an external or internal origin—that contribute to the successful reprogramming of supportive cells in the retina called Muller glia. In zebrafish, Muller glia can give rise to photoreceptor cells after injury to the retina. First, the investigators plan to test a novel combination of pharmacological agents and genetic manipulation for the ability to reprogram Muller glia in mice. If the therapy is successful, they will then study the conditions that support regeneration by determining which genes are turned on or off in regenerating zebrafish and mouse Muller glia. A second component of their project will look at the role of exosomes, tiny cell-secreted vesicles commonly found in blood and other bodily fluids, in promoting regeneration.</p>
|
||
|
||
|
||
</div>
|
||
|
||
|
||
|
||
</div>
|
||
|
||
|
||
|
||
<div class="c-section" id="section-id-13987">
|
||
<h3 class="c-section__heading">
|
||
|
||
|
||
|
||
|
||
Comparative transcriptomic and epigenomic analyses of Muller glia reprogramming (EY027267-01)
|
||
|
||
|
||
</h3>
|
||
|
||
|
||
|
||
|
||
|
||
<div class="c-image c-image--has-caption c-image--left">
|
||
<div class="c-image__src">
|
||
<img src="https://www.nei.nih.gov/sites/default/files/styles/small/public/2019-06/hyde_0.png?itok=0_A9QR_F" alt="Man in white coat surrounded by vials looks at the camera" width="220" height="196">
|
||
</div>
|
||
<div class="c-image__caption">
|
||
|
||
|
||
|
||
|
||
<p>David R. Hyde, Ph.D.</p>
|
||
|
||
|
||
</div>
|
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</div>
|
||
|
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<div class="c-text">
|
||
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|
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<p><em>Principal investigators: David R. Hyde, Ph.D., University of Notre Dame, South Bend, Indiana; John D. Ash, Ph.D., University of Florida, Gainesville; Andy J. Fischer, Ph.D., Ohio State University, Columbus; Seth Blackshaw, Ph.D., and Jiang Qian, Ph.D., Johns Hopkins University, Baltimore</em></p><p>In zebrafish and chicks, retinal damage induces Muller glia to reprogram and re-enter the cell cycle to produce neuronal progenitor cells, which are capable of moving to damaged retinal tissue and turning into the missing neuronal cell types. While Muller glia can initiate a regenerative response in the damaged zebrafish and chick retinas, mammalian Muller glia cannot, thereby preventing retinal regeneration and restoration of vision in humans and other mammals. Hyde and his colleagues are comparing the capacity of Muller glia cells from zebrafish, chicks and mice to perform this type of reprogramming. From the Muller glia in each animal, they will determine what gene activity is upregulated or downregulated (transcriptomics), as well as look for modifications to the genomic DNA (epigenomics), during retinal development and in response to different forms of retinal damage. These types of cross-species comparisons are designed to detect differences in gene expression, as well as to identify potential regulators that control Muller glia reprogramming. This work will shed light on why some species possess the ability to regenerate their damaged retinas while humans cannot.</p>
|
||
|
||
|
||
</div>
|
||
|
||
|
||
|
||
</div>
|
||
|
||
|
||
|
||
<div class="c-section" id="section-id-13990">
|
||
<h3 class="c-section__heading">
|
||
|
||
|
||
|
||
|
||
Novel targets to promote RGC axon regeneration: Insights from unique retinal ganglion cell cohorts (EY027257-01)
|
||
|
||
|
||
</h3>
|
||
|
||
|
||
|
||
|
||
|
||
<div class="c-image c-image--has-caption c-image--left">
|
||
<div class="c-image__src">
|
||
<img src="https://www.nei.nih.gov/sites/default/files/styles/small/public/2019-06/vance_kevin_sanjoy.png?itok=tjNz1Ulr" alt="Three men in lab coats smile at the camera" width="220" height="135">
|
||
</div>
|
||
<div class="c-image__caption">
|
||
|
||
|
||
|
||
|
||
<p>Vance Lemmon, Ph.D., Kevin Park, Ph.D., and Sanjoy Bhattacharya, Ph.D.</p>
|
||
|
||
|
||
</div>
|
||
</div>
|
||
|
||
<div class="c-text">
|
||
|
||
|
||
|
||
|
||
<p><em>Principal investigators: Kevin Park, Ph.D.; Vance Lemmon, Ph.D.; Sanjoy Bhattacharya, Ph.D., University of Miami Miller School of Medicine</em></p><p>Park and Lemmon are using RNA sequencing in cultured mouse retinal ganglion cells to identify differences in the expression of genes in regenerative versus non-regenerative retinal ganglion cells. In parallel, Park and Bhattacharya will use mass spectrometry to determine what lipids (or fat molecules) may give subclasses of retinal ganglion cells more robust regenerative capacities. The researchers will then perform a set of experiments aimed at understanding the function of the genes found to be involved in regeneration. The most promising gene candidates will be used as a therapy aimed at regenerating the optic nerve in a mouse model with optic nerve injury.</p>
|
||
|
||
|
||
</div>
|
||
|
||
|
||
|
||
</div>
|
||
|
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<div class="c-text">
|
||
|
||
|
||
|
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|
||
<p>For more information about these and other AGI projects, visit the NEI AGI webpage at <a href="/AGI">www.nei.nih.gov/audacious</a>.</p><p> </p><p><em>NEI leads the federal government’s research on the visual system and eye diseases. NEI supports basic and clinical science programs to develop sight-saving treatments and address special needs of people with vision loss. For more information, visit </em><a href="/"><em>https://www.nei.nih.gov</em></a><em>.</em></p><p><em>About the National Institutes of Health (NIH): NIH, the nation’s medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit </em><a href="http://www.nih.gov/"><em>http://www.nih.gov/</em></a><em>.</em></p><p><em>NIH…Turning Discovery Into Health®</em></p>
|
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|
||
|
||
</div>
|
||
|
||
|
||
|
||
<div class="c-contact">
|
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<h2 class="c-contact__heading">Contact</h2>
|
||
<div class="c-contact__label c-contact__name"><strong>Kathryn DeMott</strong></div>
|
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<div class="c-contact__label c-contact__email">
|
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<a href="mailto:neinews@nei.nih.gov">Email</a>
|
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</div>
|
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<div class="c-contact__label c-contact__phone">301-496-5248</div>
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</div>
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</div>
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</article>
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