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Pathophysiological Role of Proteasome-Dependent Proteolytic Pathway in Endothelin-1-Related Cardiovascular Diseases

[ Vol. 1 , Issue. 1 ]

Author(s):

M. Takaoka, M. Ohkita and Y. Matsumura   Pages 19 - 26 ( 8 )

Abstract:


A proteasome-dependent proteolytic pathway serves important functions in cell cycle control and transcriptional regulation; however, its pathophysiological role in cardiovascular diseases is still unclear. We have recently obtained evidence that proteasome inhibitors are capable of preventing the development of deoxycorticosterone acetate (DOCA)-salt-induced hypertension or hypertrophy and of ischemic acute renal failure (ARF). Beneficial effects of the proteasome inhibitors were accompanied by a decrease in endothelin-1 (ET-1) content in the aorta and kidney of DOCA-salt and ischemic ARF animals, respectively. In addition, there is evidence showing that the reduction of nuclear factor-kB (NF-kB) activation is involved in the mechanisms for suppressive effects of proteasome inhibitors on ET-1 gene transcription and the consequent decrease in ET-1 mRNA expression in the cultured vascular endothelial cells. These findings suggest that a proteasome-dependent proteolytic pathway has a crucial role in the pathogenesis of ET-1-related cardiovascular diseases, probably through the activation of NF-kB, and also that the use of proteasome inhibitors may be a novel approach to the treatment of cardiovascular diseases.

Keywords:

proteasome, endothelin-1, hypertension, hypertrophy, acute renal failure

Affiliation:

Department of Pharmacology, Osaka University of Pharmaceutical Sciences, 4-20-1Nasahara, Takatsuki, Osaka, Japan



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