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. 1989 May 15;260(1):195–200. doi: 10.1042/bj2600195

Effects of ischaemia, blood loss and reperfusion on rat muscle protein synthesis, metabolite concentrations and polyribosome profiles in vivo.

P A MacLennan 1, M J Rennie 1
PMCID: PMC1138645  PMID: 2775182

Abstract

In adult rat gastrocnemius muscles, on reperfusion after 45 min of tourniquet ischaemia, protein synthetic rates were depressed by over half for 1 h compared to normal (12%/day), and were at least one-third below normal for up to 5 h afterwards. Ischaemia caused muscle concentrations of phosphocreatine to be depressed by 70%, and those of lactate to be elevated by 350%; the proportion of ribosomes as polyribosomes was decreased by half. Unlike the rates of protein synthesis, all of these variables returned to normal after 35 min of reperfusion. When 25% of the blood volume was removed (for 10-45 min), there were falls in the rate of gastrocnemius protein synthesis and in phosphocreatine concentration, and an increase in lactate concentration. On blood replacement, protein synthesis and metabolite concentrations returned to normal within 15 min. Polyribosome profiles were unaffected by blood loss or replacement. There were highly significant correlations between the rate of gastrocnemius protein synthesis and both phosphocreatine concentration and 1/(lactate concentration), during blood loss and replacement, i.e. during both the fall and rise in muscle energy status. We conclude that the effects of ischaemia and blood loss on protein synthesis are not equivalent.

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Selected References

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