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Connective tissue growth factor (CTGF) has been postulated to have prosclerotic and angiogenic properties. The aim of this present study was to characterize retinal CTGF expression in the absence and presence of diabetes and in the context of treatment with the angiotensin-converting enzyme (ACE) inhibitor, perindopril. Retinas were obtained from control, diabetic, and diabetic plus perindopril-treated (3 mg/d) rats. CTGF gene expression was quantitated by RT-PCR and localized by in situ hybridization. CTGF protein expression was analyzed by Western blotting and localized by immunohistochemistry. Diabetes was associated with a greater than 2-fold increase in CTGF mRNA levels, which was attenuated by perindopril treatment. CTGF immunoreactivity was increased almost 2-fold in diabetes and was ameliorated by the ACE inhibitor perindopril. By in situ hybridization and immunohistochemistry, the major site of CTGF gene expression in the retina of diabetic rats was the ganglion cell layer. Based on the known in vivo effects of CTGF, it is postulated that this growth factor plays a pivotal role in mediating diabetes-associated retinal pathology. Furthermore, the protective effects of ACE inhibitors on retinal pathology may partly be mediated via effects on retinal CTGF expression.

Connective Tissue Growth Factor Is Up-Regulated in the Diabetic Retina: Amelioration by Angiotensin-Converting Enzyme Inhibition