PMID: 9179598Jun 1, 1997Paper

Regulation of aldose reductase expression in rat astrocytes in culture

Glia
C Jacquin-Becker, G Labourdette

Abstract

Aldose reductase (AR) is known to be responsible for many side effects of diabetes. In the present work, we studied the effects of various extracellular signals on the regulation of the expression of AR in astrocytes in culture, by determining its enzymatic activity or its mRNA level. We found that basic fibroblast growth factor (bFGF), acidic fibroblast growth factor (aFGF), epidermal growth factor (EGF), and hypertonic NaCl were able to increase the expression of AR in astrocytes. A superinduction was found when bFGF was combined with hypertonicity. We also observed that AR activity was independent of glucose concentration in the culture medium. However, when the concentration of glucose in the culture medium was under 1 g/l, bFGF did not increase the activity of AR. Thus, when glucose is depleted, the regulation of AR expression by bFGF does not operate. In addition, AR does not seem to be involved in control of astrocyte proliferation, in contrast to the effects reported on other cell types. These results indicate that AR is expressed in astrocytes and that its expression is upregulated by hypertonicity but also by FGFs and EGF. This suggests that in these cells, AR elicits some regulatory functions.

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Citations

Aug 4, 2001·The Biochemical Journal·S SrivastavaS K Srivastava
Mar 1, 2011·Chemico-biological Interactions·Satish K SrivastavaKota V Ramana
Apr 18, 2001·Chemico-biological Interactions·B L DixitS K Srivastava
Jul 15, 2000·Arteriosclerosis, Thrombosis, and Vascular Biology·J RuefA Bhatnagar
Dec 21, 2007·Nature Reviews. Neuroscience·David R Tomlinson, Natalie J Gardiner
Jun 14, 2002·The Journal of Biological Chemistry·Kota V RamanaSatish K Srivastava
Apr 15, 2000·The Journal of Biological Chemistry·B L DixitS K Srivastava

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