Opposing Actions of Heat Shock Protein 90 and 70 Regulate Nicotinamide Adenine Dinucleotide Phosphate Oxidase Stability and Reactive Oxygen Species Production
| Autor: | Yusi Wang, Christiana Dimitropoulou, Bo Cheng, R. Dan Rudic, Ahmed Chadli, David W. Stepp, Yanfang Yu, Vijay Patel, David Fulton, John D. Catravas, Jin Qian, Feng Chen |
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| Rok vydání: | 2012 |
| Předmět: |
Male
Ubiquitin-Protein Ligases HL-60 Cells Protein degradation Article Mice Superoxides Heat shock protein Animals Humans HSP70 Heat-Shock Proteins HSP90 Heat-Shock Proteins RNA Small Interfering chemistry.chemical_classification Reactive oxygen species NADPH oxidase biology Macrophages NADPH Oxidases Hsp90 Hsp70 Ubiquitin ligase Mice Inbred C57BL HEK293 Cells chemistry Biochemistry COS Cells biology.protein Chaperone binding Reactive Oxygen Species Cardiology and Cardiovascular Medicine |
| Zdroj: | Arteriosclerosis, Thrombosis, and Vascular Biology. 32:2989-2999 |
| ISSN: | 1524-4636 1079-5642 |
| DOI: | 10.1161/atvbaha.112.300361 |
| Popis: | Objective— Excessive reactive oxygen species contribute to vascular dysfunction. We have previously shown that heat shock protein (Hsp90) inhibitors potently suppress Nox 1 to 3 and 5, and the goals of this study were to identify how molecular chaperones regulate Nox function. Methods and Results— In vitro, protein expression of Nox 1 to 2, 5 was decreased by Hsp90 inhibitors in multiple cell types (human pulmonary artery endothelial cells, neutrophils, macrophages, and human saphenous vein). In mice treated with Hsp90 inhibitors, Nox1 expression was reduced in lung along with reduced reactive oxygen species from leukocytes. Elevated reactive oxygen species production in obese (db/db) aorta was suppressed by Hsp90 inhibition. Hsp90 inhibitors did not alter Nox5 micro RNA levels, and proteasome inhibition prevented Nox2 and 5 protein degradation and increased ubiquitin incorporation. Inhibition of Hsp90 upregulated the expression of Hsp70 and Hsp70-bound Nox2, 5 and promoted degradation. Silencing Hsp70 prevented Hsp90 inhibitor–mediated degradation of Nox5. The Hsp70-regulated ubiquitin ligase, carboxyl terminus of Hsp70-interacting protein (CHIP), also bound Nox5 and promoted increased Nox5 ubiquitination and degradation. The chaperone binding and ubiquitination domains of CHIP were required, and the silencing of CHIP blunted Hsp90 inhibitor–mediated degradation of Nox2 and 5. Conclusion— We conclude that Hsp90 binds to and regulates Nox protein stability. These actions are opposed by Hsp70 and CHIP, which promote the ubiquitination and degradation of Nox proteins and reduce reactive oxygen species production. |
| Databáze: | OpenAIRE |
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