Developmental Neuroscience

Sankar S. · Suresh D. · Ibrahim M.

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Article / Publication Details Abstract

The objective is to study the effects of high glucose on the morphological changes and to observe the expression of apoptosis regulatory proteins in the developing retina in-vivo using Zebrafish embryos. Wild type male and female zebrafish were allowed for normal mating and the fertilized eggs were collected and exposed to hyperglycemic conditions (25mMol D-Glucose) for 96 hours. The embryos were subjected to various morphological and histological analyses in a time dependent manner. The embryos showed morphological defects such as body curvature, abnormal eye shape and low pigmentation of the eye in the high glucose induced embryos compared to the control. Histomorphometry studies using H&E stained slides showed increased thickness of GCL and INL and thinning of the IPL in the retina of high glucose exposed embryos when compared to its time matched control. Furthermore, the TUNEL assay and modified trichrome staining indicated apoptosis of many cells in the high glucose induced group compared to the control. Immunohistochemistry (IHC) findings revealed that expression of Bax, Caspase3 & Caspase9 was increased with decreased expression of Bcl-2 in the high glucose treated group compared to control. From the present data it is concluded that gestational exposure to high glucose stimulate apoptotic cell in the developing retinal layers via activating the pro-apoptotic and repressing the anti-apoptotic proteins.

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