Key result
Activation of PKC-betaII in cardiomyocytes via PMA stimulation resulted in an 8-fold increase in ACE mRNA expression compared to a 2-fold increase in control cells.
Why the study?
Does PKC-betaII activation induce ACE expression in neonatal rat cardiomyocytes?
Does PKC-betaII activation induce ACE expression in neonatal rat cardiomyocytes?
Activation of PKC-betaII in cardiomyocytes induces ACE expression, suggesting a mechanism for PKC involvement in cardiac hypertrophy and fibrosis.
Answers are grounded in this paper and cite their sources.
May link PKC-betaII to ACE in cardiomyocyte remodeling; hypothesis-generating for human hypertrophy, should not change practice.
OBJECTIVE: Members of the protein kinase C (PKC) family are important mediators of cell signaling underlying multiple aspects of myocardial function. Activation of the betaII isoform of PKC is thought to be involved in the development of congestive heart failure. To investigate the biological effect of PKC-betaII, we measured gene expression of angiotensin converting enzyme (ACE) and angiotensin II (AngII) receptors AT(1A) and AT(1B) in cardiomyocytes overexpressing PKC-betaII. METHODS: An adenovirus construct expressing PKC-betaII was introduced into cultured neonatal rat ventricular myocytes (NRVMs). Western blot and in situ kinase assay was used to measure PKC-betaII level and activity in NRVMs. Real time quantitative reverse transcription-polymerase chain reaction (RT-PCR) analysis was used to measure the mRNA levels of several genes following PMA stimulation of either un-infected or ad-PKC-betaII infected cells. RESULTS: Our data show that activation of PKC-betaII in cardiomyocytes leads to elevated expression of angiotensin-converting enzyme (ACE) gene. Treatment of adeno-PKC-betaII infected cardiomyocytes with phorbol 12-myristate 13-acetate (PMA) resulted in an 8-fold increase of ACE mRNA expression, whereas ACE mRNA levels only increased around 2-fold in uninfected or adeno-GFP (green fluorescent protein) infected cardiomyocytes with similar PMA treatment. The induction of ACE mRNA was blocked by the PKC-beta-specific antagonist LY379196. No significant change of angiotensin II receptors AT1a and AT1b could be detected in the cardiomyocytes expressing PKC-betaII. CONCLUSION: These data indicate that ACE is a transcription target of PKC-betaII activation in cardiomyocytes, and also suggest a mechanism for the involvement of PKC in cardiac hypertrophy and fibrosis through increased activity of angiotensin converting enzyme in the myocardium.
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Youyu Zhang (2002) studied this question. Adenovirus construct expressing PKC-betaII with PMA stimulation vs. Uninfected or adeno-GFP infected cardiomyocytes with PMA stimulation was evaluated on ACE mRNA expression. Activation of PKC-betaII in cardiomyocytes via PMA stimulation resulted in an 8-fold increase in ACE mRNA expression compared to a 2-fold increase in control cells.
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