Evidence for p53 as Guardian of the Cardiomyocyte Mitochondrial Genome Following Acute Adriamycin Treatment

• Published in: The journal of histochemistry and cytochemistry Vol. 55; no. 6; pp. 629 - 639
• Main Authors: Nithipongvanitch, Ramaneeya, Ittarat, Wanida, Velez, Joyce M., Zhao, Rui, St. Clair, Daret K., Oberley, Terry D.
• Format: Journal Article
• Language: English
• Published: Los Angeles, CA SAGE Publications 01.06.2007
• Subjects: Animals; Apoptosis Regulatory Proteins; bcl-2-Associated X Protein - metabolism; Blotting, Western; Cytochromes c - secretion; Deoxyguanosine - analogs & derivatives; Deoxyguanosine - metabolism; DNA Damage; DNA, Mitochondrial - genetics; DNA, Mitochondrial - metabolism; Doxorubicin - pharmacology; Genotype; HCT116 Cells; Humans; Immunohistochemistry; Male; Mice; Mice, Inbred C57BL; Mice, Inbred Strains; Mice, Knockout; Microscopy, Immunoelectron; Mitochondria, Heart - drug effects; Mitochondria, Heart - metabolism; Mitochondria, Heart - ultrastructure; Models, Biological; Mutation; Myocytes, Cardiac - metabolism; Myocytes, Cardiac - ultrastructure; Oxidation-Reduction - drug effects; Tumor Suppressor Protein p53 - genetics; Tumor Suppressor Protein p53 - metabolism; Tumor Suppressor Protein p53 - physiology; Tumor Suppressor Proteins - metabolism; apoptosis; doxorubicin; cardiomyopathy; mitochondrial DNA; oxidative stress
• ISSN: 0022-1554; 1551-5044
• DOI: 10.1369/jhc.6A7146.2007

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 cardio-myocyte 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.