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. 1989 Aug;9(8):3203–3211. doi: 10.1128/mcb.9.8.3203

Mitogen stimulation affects contractile protein mRNA abundance and translation in embryonic quail myocytes.

K E Latham 1, I R Konigsberg 1
PMCID: PMC362364  PMID: 2796987

Abstract

In cultures of differentiated, fusion-blocked muscle cells obtained from embryonic Japanese quail (Coturnix coturnix japonica), mitogen stimulation leads to an immediate reduction in the rates of synthesis of skeletal muscle myosin heavy chain (MHC) and alpha-actin. The molecular mechanisms responsible for this downregulation were examined. The cellular abundances of the alpha-actin and MHC mRNAs were affected differently by mitogen stimulation; alpha-actin mRNA abundance declined by an amount which quantitatively accounted for the observed decrease in alpha-actin synthesis, whereas MHC mRNA abundance remained virtually unchanged during the first 6 h following mitogen stimulation, a period during which MHC synthesis declined by more than 70%. MHC mRNA abundance did decline between 6 and 12 h after mitogen stimulation. Downregulation of MHC synthesis therefore involves an initial block in mRNA translation combined with a later loss of MHC mRNA from the cytoplasma, while alpha-actin synthesis is regulated at the level of mRNA abundance. These observations are consistent with the hypothesis that, in addition to transcriptional activation of muscle-specific genes, skeletal muscle differentiation normally involves cell cycle-dependent modulations in cellular factors which control message stability and message translation.

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Selected References

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