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. 1991 Oct;178:243–253.

Prostaglandin synthetase and prostacyclin synthetase in mature rat skeletal muscles: immunohistochemical localisation to arterioles, tendons and connective tissues.

I S McLennan 1, R E Macdonald 1
PMCID: PMC1260550  PMID: 1810931

Abstract

Mature skeletal muscles produce appreciable quantities of prostacyclin (PGI2) and smaller amounts of PGF2 alpha and PGE2, but the sources of these prostaglandins within skeletal muscle are unknown. Monoclonal antibodies to prostaglandin synthetase and prostacyclin synthetase were used to determine which muscle cells produce prostaglandins. The antibody to prostacyclin synthetase stained the tendon, fascia, epimysium and the arteries leading to the muscles. The endothelia of arterioles were also stained in the tibialis anterior and cremaster but not in the soleus muscles. Only trace levels of immunoreactivity were observed with the antibody to prostaglandin synthetase in normal muscles. However, immunoreactivity was observed in the muscles of rats that had been pretreated with aspirin, a drug that inhibits and stabilises prostaglandin synthetase. In muscles of the aspirin-treated rats, all cell types that were stained by the antiprostacyclin synthetase also reacted weakly with the antibody to prostaglandin synthetase. In addition, some cells in the endomysium were strongly stained with the antiprostaglandin synthetase but not with the antiprostacyclin synthetase. We conclude that (1) at least one aspect of the regulation of blood flow in the microcirculation of slow muscles is different from that of fast muscles, (2) that the tendon and connective tissue is the major source of PGI2 in mature skeletal muscles, and (3) that the prostaglandin-dependent effects of insulin and some other stimuli on skeletal muscle may be mediated by the muscle's arterioles or connective tissue.

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Selected References

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