Sox2 plays a role in the induction of amacrine and Müller glial cells in mouse retinal progenitor cells

Investigative Ophthalmology & Visual Science
Ya-ping LinSumiko Watanabe

Abstract

The transcription factor Sox2 plays important roles in both human and mouse retinal development. Although loss-of-function mutations in Sox2 have been studied in mice, gain-of-function experiments in the neural retina have been lacking. The detailed expression pattern of Sox2 in the developing mouse retina was examined by immunohistochemistry. Then, Sox2 was expressed in a retinal explant culture prepared from E17 mouse embryos by retrovirus-mediated gene transfer to examine its role in retinal development. In addition, shRNA was used to suppress Sox2 in a retinal explant using a retrovirus-mediated system. Sox2 was expressed throughout the neuroblastic layer in the embryonic retina, but only in the inner nuclear layer in the mature retina. Double immunostaining revealed that Sox2 was expressed in Müller glial cells and in a subset of amacrine cells. Forced expression of Sox2 in a mouse retinal explant culture resulted in the dramatic accumulation of amacrine cells in the inner nuclear layer; in addition, cells expressing amacrine cell markers were also found on the innermost side of the outer nuclear layer. The expression of Pax6, which plays an important role in amacrine cell differentiation, was observed in the Sox2-expressi...Continue Reading

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