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- W2052808053 abstract "The expression of genes coding for the beta 1-adrenergic receptor (beta 1-AR), the alpha subunit of Gs and total myosin heavy chain (MHC) was compared between left ventricles (LV's) from young (6-7 weeks old) and old (22 months old) rats. The mRNA levels were quantitated by Northern or Slot blots analyses using specific DNA probes. Ageing was found to be associated with a reduction in beta 1-AR (77%), G alpha s (33%) and, total MHC (51%) mRNA levels with no concomitant change in 18S RNA and poly(A+) mRNA levels. These results indicate that transcriptional and/or post-transcriptional mechanisms participate in the control of beta-adrenergic receptor density during ageing. As in the senescent LV, beta 1-AR mRNA level is reduced in the hypertrophied LV, whereas the level of G alpha s mRNA is reduced in the senescent but not in the hypertrophied LV. From our data we conclude (1) that a dual mechanism may operate during ageing, mechanical factors indirectly regulating beta 1-AR mRNA level, while changes in G alpha s mRNA level do not depend on hemodynamic load and (2) that the re-expression of beta-MHC mRNA does not compensate for the decreased accumulation of alpha-MHC mRNA which results in a large decrease in the level of total MHC mRNA in the senescent LV." @default.
- W2052808053 created "2016-06-24" @default.
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- W2052808053 date "1993-10-01" @default.
- W2052808053 modified "2023-09-26" @default.
- W2052808053 title "Decreased accumulation of β1-adrenergic receptor, Gαs and total myosin heavy chain messenger RNAs in the left ventricle of senescent rat heart" @default.
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- W2052808053 doi "https://doi.org/10.1016/0047-6374(93)90082-3" @default.
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