alexa Up-regulation of Bcl-2 by redox signals in glomerular mesangial cells.
Clinical Research

Clinical Research

Journal of Clinical Research & Bioethics

Author(s): Sandau KB, Brne B

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The mediators nitric oxide (NO) and superoxide (O2-) are known to regulate cell death and survival. In mesangial cells (MC), NO induced apoptosis and in higher concentrations necrosis. Intriguingly, cogeneration of NO and O2- in a balanced ratio promoted cell protection. Under these conditions, we noticed the accumulation of the anti-apoptotic protein Bcl-2. Its up-regulation is based on an increase in mRNA and protein level. To investigate whether oxidative stress elicits Bcl-2 expression in general, we further used the chemically unrelated oxidative agents diamide and butyl hydroperoxide. Both stimulated mRNA and protein up-regulation of Bcl-2. But in contrast to diamide, butyl hydroperoxide evoked apoptosis and necrosis despite Bcl-2 accumulation. As diamide was non-toxic, we used diamide as a Bcl-2 activator to protect MC against a subsequent toxic dose of NO. We conclude that redox changes promote Bcl-2 up-regulation that may confer cellular protection towards apoptosis.

 

This article was published in Cell Death Differ. and referenced in Journal of Clinical Research & Bioethics

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