Key result
Myocardial hypertrophy induced by pressure overload or genetics reduced G protein mRNA and protein levels, suggesting the decrease in G proteins is a consequence rather than a cause of hypertrophy.
Why the study?
Does myocardial hypertrophy alter the levels and function of G-proteins in hamster models?
Does myocardial hypertrophy alter the levels and function of G-proteins in hamster models?
A decrease in G proteins appears to be a consequence rather than a cause of myocardial hypertrophy in hamster models.
Reduced G-protein function observed in hypertrophy models; leaves open causal contribution and requires targeted validation studies.
To clarify the role of the guanine nucleotide binding proteins (G-proteins) in the pathogenesis of myocardial hypertrophy, we investigated the alterations in myocardial G proteins in 20-week-old F1b hamsters with pressure overload induced for 3 days (3-day AS), 7 days (7-day AS) and 14 days (14-day AS) by the stenosis of the abdominal aorta, and in 4- and 20 week-old BIO 14.6 Syrian hamsters (4-wk and 20-wk BIO) with genetic myocardial hypertrophy. The hearts of 7-day AS, 14-day AS and 20-wk BIO with left ventricular hypertrophy exhibited a decrease in the mRNA levels detected by Northern blot analysis and protein levels of G protein detected by Western blot analysis as compared with sham-operated and age-matched F1b hearts. The function of Gs or Gi showed a concomitant reduction in both models of myocardial hypertrophy. The hearts of 3-day AS and 4-wk BIO without myocardial hypertrophy showed no changes in G proteins as compared with sham-operated and age-matched F1b hearts. These results suggest that a decrease in G proteins is not involved in the pathogenesis of myocardial hypertrophy, but that myocardial hypertrophy reduced the G proteins.
No takes yet. Share an insight, caveat, or question.
Nakamura et al. (1996) studied Myocardial hypertrophy. Pressure overload or genetic myocardial hypertrophy vs. Sham-operated and age-matched F1b hearts was evaluated on Alterations in myocardial G proteins (mRNA and protein levels). Myocardial hypertrophy induced by pressure overload or genetics reduced G protein mRNA and protein levels, suggesting the decrease in G proteins is a consequence rather than a cause of hypertrophy.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: