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In this study, we examined whether a modest increase of retinal BDNF promotes retinal ganglion cell (RGC) survival after acute injury of the optic nerve in mice. We adopted an inducible Cre-recombinase transgenic system to up-regulate BDNF in the mouse retina and then examined RGC survival after optic nerve crush by<jats:italic>in vivo<\/jats:italic>imaging. We focused on one subtype of RGC with large soma expressing yellow fluorescent protein transgene that accounts for \u223c11% of the total SMI-32\u2013positive RGCs. The median survival time of this subgroup of SMI-32 cells was 1 week after nerve injury in control mice but 2 weeks when BDNF was up-regulated. Interestingly, we found that the survival time for RGCs taken as a whole was 2 weeks, suggesting that these large-soma RGCs are especially vulnerable to optic nerve crush injury. We also studied changes in axon number using confocal imaging, confirming first the progressive loss reported previously for wild-type mice and demonstrating that BDNF up-regulation extended axon survival. Together, our results demonstrate that the time course of RGC loss induced by optic nerve injury is type specific and that overexpression of BDNF prolongs the survival of one subgroup of SMI-32\u2013positive RGCs.<\/jats:p>","DOI":"10.1523\/eneuro.0331-16.2016","type":"journal-article","created":{"date-parts":[[2017,1,6]],"date-time":"2017-01-06T02:40:30Z","timestamp":1483670430000},"page":"ENEURO.0331-16.2016","source":"Crossref","is-referenced-by-count":49,"title":["Overexpression of Brain-Derived Neurotrophic Factor Protects Large Retinal Ganglion Cells After Optic Nerve Crush in 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