Purchase this article with an account.
A.A. Sieh, D. Goldman, P. Hitchcock; Retinal injury induces the expression of alpha–1 tubulin in teleost retinal progenitors . Invest. Ophthalmol. Vis. Sci. 2004;45(13):5399.
Download citation file:
© ARVO (1962-2015); The Authors (2016-present)
Purpose:Teleost fish have the capacity to regenerate their retinal neurons following injury. Molecular mechanisms involved in regulating this regenerative process are poorly understood. The study reported here sought to identify genes whose expressions are modulated during retinal regeneration. Alpha–1 tubulin is a member of the α–tubulin multigene family and is known to be expressed in neural progenitors. Expression of α–1 tubulin was analyzed following retinal injury. Methods:Two different species of teleost were used in this study: zebrafish, transgenic for green fluorescent protein (GFP) under the control of a specific α–1 tubulin promoter and common goldfish. Retinas were injured and fish were allowed to recover for various intervals. Prior to sacrifice animals were housed for 12–36 hrs. in a solution of 5mM BrdU to label proliferating cells. Eyecups were harvested and processed, according to standard techniques, for GFP and BrdU immunocytochemistry and in situ hybridization. Results:In the transgenic zebrafish, four days after retinal injury intense GFP expression was noted in the proliferative blastema. Cells expressing both GFP and BrdU were found to span all the retinal layers, with the majority being located in the inner nuclear layer (INL). In situ hybridization of adjacent sections with the α1–tubulin specific probe confirmed the specificity of the GFP signal, showing the upregulation of α1–tubulin in the mitotically active cells of the blastema. In the goldfish retina, ten days after injury, in situ hybridization revealed a robust expression of α1–tubulin at the margins of the retinal wound, corresponding to BrdU labeled retinal progenitors. In addition α1–tubulin expression was noted in cells close to the retinal lesion, some of which did not incorporate BrdU. Conclusions:These data show that α1–tubulin is robustly increased upon injury in retinal progenitors of both zebrafish and goldfish retinas. In the teleost retina α1–tubulin can thus be used as a molecular marker for injury induced retinal progenitors.
This PDF is available to Subscribers Only