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Title: Evidence for p53 as guardian of the cardiomyocyte mitochondrial genome following acute adriamycin treatment
Authors: Ramaneeya Nithipongvanitch
Wanida Ittarat
Joyce M. Velez
Rui Zhao
Daret K. St. Clair
Terry D. Oberley
University of Wisconsin School of Medicine and Public Health
Mahidol University
University of Kentucky
VA Medical Center
Keywords: Medicine
Issue Date: 1-Jun-2007
Citation: Journal of Histochemistry and Cytochemistry. Vol.55, No.6 (2007), 629-639
Abstract: The present study is an initial analysis of whether p53 may function as guardian of the cardiomyocyte mitochondrial genome, with mitochondrial p53 localization proposed to be involved in both mitochondrial DNA (mtDNA) repair and apoptosis. Subcellular distribution, protein levels, and possible function(s) of p53 protein in the response of cardiomyocytes to adriamycin (ADR) were analyzed. Levels and subcellular localization of proteins were determined by Western blot and immunogold ultrastructural analysis techniques. Here we demonstrate that stress caused by ADR induced upregulation of p53 protein in cardiomyocyte mitochondria and nuclei between 3 and 24 hr. Increased expression of PUMA and Bax proteins, pro-apoptotic targets of p53, was documented following ADR treatment and was accompanied by increased levels of apoptotic markers, with elevation of cytosolic cytochrome c at 24 hr and subsequent caspase-3 cleavage at 3 days. Mitochondrial p53 levels correlated with mtDNA oxidative damage. Loss of p53 in knockout mouse heart resulted in a significant increase in mtDNA vulnerability to damage following ADR treatment. Our results suggest that mitochondrial p53 could participate in mtDNA repair as a first response to oxidative damage of cardiomyocyte mtDNA and demonstrate an increase of apoptotic markers as a result of mitochondrial/nuclear p53 localization. © The Histochemical Society, Inc.
ISSN: 00221554
Appears in Collections:Scopus 2006-2010

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