Pim-1 preserves mitochondrial morphology by inhibiting dynamin-related protein 1 translocation

Mitochondrial morphological dynamics affect the outcome of ischemic heart damage and pathogenesis. Recently, mitochondrial fission protein dynamin-related protein 1 (Drp1) has been identified as a mediator of mitochondrial morphological changes and cell death during cardiac ischemic injury. In this...

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Veröffentlicht in:Proceedings of the National Academy of Sciences - PNAS 2013-04, Vol.110 (15), p.5969-5974
Hauptverfasser: Din, Shabana, Mason, Matthew, Völkers, Mirko, Johnson, Bevan, Cottage, Christopher T., Wang, Zeping, Joyo, Anya Y., Quijada, Pearl, Erhardt, Peter, Magnuson, Nancy S., Konstandin, Mathias H., Sussman, Mark A.
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container_end_page 5974
container_issue 15
container_start_page 5969
container_title Proceedings of the National Academy of Sciences - PNAS
container_volume 110
creator Din, Shabana
Mason, Matthew
Völkers, Mirko
Johnson, Bevan
Cottage, Christopher T.
Wang, Zeping
Joyo, Anya Y.
Quijada, Pearl
Erhardt, Peter
Magnuson, Nancy S.
Konstandin, Mathias H.
Sussman, Mark A.
description Mitochondrial morphological dynamics affect the outcome of ischemic heart damage and pathogenesis. Recently, mitochondrial fission protein dynamin-related protein 1 (Drp1) has been identified as a mediator of mitochondrial morphological changes and cell death during cardiac ischemic injury. In this study, we report a unique relationship between Pim-1 activity and Drp1 regulation of mitochondrial morphology in cardiomyocytes challenged by ischemic stress. Transgenic hearts overexpressing cardiac Pim-1 display reduction of total Drp1 protein levels, increased phosphorylation of Drp1- S⁶³⁷, and inhibition of Drp1 localization to the mitochondria. Consistent with these findings, adenoviral-induced Pim-1 neonatal rat cardiomyocytes (NRCMs) retain a reticular mitochondrial phenotype after simulated ischemia (sI) and decreased Drp1 mitochondrial sequestration. Interestingly, adenovirus Pim-dominant negative NRCMs show increased expression of Bcl-2 homology 3 (BH3)-only protein p53 up-regulated modulator of apoptosis (PUMA), which has been previously shown to induce Drp1 accumulation at mitochondria and increase sensitivity to apoptotic stimuli. Overexpression of the p53 up-regulated modulator of apoptosis–dominant negative adenovirus attenuates localization of Drp1 to mitochondria in adenovirus Pim-dominant negative NRCMs promotes reticular mitochondrial morphology and inhibits cell death during sI. Therefore, Pim-1 activity prevents Drp1 compartmentalization to the mitochondria and preserves reticular mitochondrial morphology in response to sI.
doi_str_mv 10.1073/pnas.1213294110
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subjects Adenoviridae - genetics
Adenoviruses
Animals
Apoptosis
Biological Sciences
cardiomyocytes
Cardiovascular disease
Cell death
Dynamins - metabolism
gene overexpression
genetically modified organisms
Heart
Ischemia
Mice
Mice, Transgenic
Mitochondria
Mitochondria - metabolism
Mitochondrial DNA
Morphology
Myocardium
Myocytes, Cardiac - cytology
Pathogenesis
phenotype
Phenotypes
Phosphorylation
preserves
Protein Transport
Proto-Oncogene Proteins c-pim-1 - metabolism
Proto-Oncogene Proteins c-pim-1 - physiology
Rats
title Pim-1 preserves mitochondrial morphology by inhibiting dynamin-related protein 1 translocation
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