Activated protein C ameliorates diabetic nephropathy by epigenetically inhibiting the redox enzyme p66Shc
The coagulation protease activated protein C (aPC) confers cytoprotective effects in various in vitro and in vivo disease models, including diabetic nephropathy. The nephroprotective effect may be related to antioxidant effects of aPC. However, the mechanism through which aPC may convey these antiox...
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| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
January 8, 2013
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| In: |
Proceedings of the National Academy of Sciences of the United States of America
Year: 2013, Volume: 110, Issue: 2, Pages: 648-653 |
| ISSN: | 1091-6490 |
| DOI: | 10.1073/pnas.1218667110 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1073/pnas.1218667110 Verlag, Volltext: https://www.pnas.org/content/110/2/648 
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| Author Notes: | Fabian Bock, Khurrum Shahzad, Hongjie Wang, Stoyan Stoyanov, Juliane Wolter, Wei Dong, Pier Giuseppe Pelicci, Muhammed Kashif, Satish Ranjan, Simone Schmidt, Robert Ritzel, Vedat Schwenger, Klaus G. Reymann, Charles T. Esmon, Thati Madhusudhan, Peter P. Nawroth, and Berend Isermann |
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| 245 | 1 | 0 | |a Activated protein C ameliorates diabetic nephropathy by epigenetically inhibiting the redox enzyme p66Shc |c Fabian Bock, Khurrum Shahzad, Hongjie Wang, Stoyan Stoyanov, Juliane Wolter, Wei Dong, Pier Giuseppe Pelicci, Muhammed Kashif, Satish Ranjan, Simone Schmidt, Robert Ritzel, Vedat Schwenger, Klaus G. Reymann, Charles T. Esmon, Thati Madhusudhan, Peter P. Nawroth, and Berend Isermann |
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| 520 | |a The coagulation protease activated protein C (aPC) confers cytoprotective effects in various in vitro and in vivo disease models, including diabetic nephropathy. The nephroprotective effect may be related to antioxidant effects of aPC. However, the mechanism through which aPC may convey these antioxidant effects and the functional relevance of these properties remain unknown. Here, we show that endogenous and exogenous aPC prevents glomerular accumulation of oxidative stress markers and of the redox-regulating protein p66Shc in experimental diabetic nephropathy. These effects were predominately observed in podocytes. In vitro, aPC inhibited glucose-induced expression of p66Shc mRNA and protein in podocytes (via PAR-1 and PAR-3) and various endothelial cell lines, but not in glomerular endothelial cells. Treatment with aPC reversed glucose-induced hypomethylation and hyperacetylation of the p66Shc promoter in podocytes. The hyperacetylating agent sodium butyrate abolished the suppressive effect of aPC on p66Shc expression both in vitro and in vivo. Moreover, sodium butyrate abolished the beneficial effects of aPC in experimental diabetic nephropathy. Inhibition of p66Shc expression and mitochondrial translocation by aPC normalized mitochondrial ROS production and the mitochondrial membrane potential in glucose-treated podocytes. Genetic ablation of p66Shc compensated for the loss of protein C activation in vivo, normalizing markers of diabetic nephropathy and oxidative stress. These studies identify a unique mechanism underlying the cytoprotective effect of aPC. Activated PC epigenetically controls expression of the redox-regulating protein p66Shc, thus linking the extracellular protease aPC to mitochondrial function in diabetic nephropathy. | ||
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