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Brain Res. 2007 Mar 9;1136(1):28-42. Epub 2006 Dec 15.

Evidence for Notch signaling involvement in retinal regeneration of adult newt.

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  • 1Life and Environmental Sciences, University of Tsukuba, Tennoudai 1-1-1, Tsukuba, Ibaraki 305-8572, Japan.

Abstract

Involvement of Notch signaling in retinal regeneration by transdifferentiation of pigment epithelium cells was investigated using the adult newt Cynops pyrrhogaster. During retinal regeneration, cells expressing Notch-1 first appeared in the regenerating retina one to two cells thick (stage E-3) originated from the retinal pigment epithelium (RPE) cells, and increased in number as the regenerating retina increased in thickness. Notch-1 expression was decreased in the central retina in association with cell differentiation and became restricted to the peripheral retina. Administration of a Notch signaling blocker DAPT resulted in the appearance of a cluster of neurons, earlier than in normal regeneration, along the regenerating retina 1-3 cells thick (stage E-3 to I-1). Immunoblot analysis suggested that DAPT could perturb the processing of Notch-1. Similar results were obtained in the newt embryonic retinal development. These results suggest that the Notch-1 signaling system may be reset to regulate neurogenesis during retinal regeneration. However, PCR analysis revealed that the adult newt RPE cells express Hes-1, neurogenin1 and sometimes Delta-1 Hes-1, neurogenin1 and sometimes Delta-1 all of which are differently regulated in association with retinal regeneration, implying that Notch signaling might also be involved early in the process of transdifferentiation.

PMID:
17217933
DOI:
10.1016/j.brainres.2006.12.032
[PubMed - indexed for MEDLINE]
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