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. 1990 Dec 15;272(3):561–568. doi: 10.1042/bj2720561

Insulin-dependent contractility of glomerular mesangial cells in response to angiotensin II, platelet-activating factor and endothelin is attenuated by prostaglandin E2.

M E Dunlop 1, R G Larkins 1
PMCID: PMC1149745  PMID: 2268285

Abstract

Culture of glomerular mesangial cells in the absence of insulin decreased the degree of contraction of individual cells in response to vasoconstrictive agonists, angiotensin II, platelet-activating factor and endothelin 1, as compared with cells cultured in the presence of insulin (0.7 nM). This change was associated with a decreased sensitivity of the intracellular Ca2+ response to vasoactive agents in fura-2-loaded cells and with an increase in the basal level of prostanoid [prostaglandins (PG) E1 and E2] production estimated by radioimmunoassay. Addition of exogenous PGE2 to insulin-exposed cells decreased the contractile response to that observed in insulin-deficient cells. Inclusion of 8-bromo cyclic AMP had a similar effect. In 45Ca2(+)-release studies it was shown that, in saponin-permeabilized insulin-exposed cells, preincubation with exogenous PGE2 or 8-bromo cyclic AMP decreased the sensitivity of 45Ca2+ release in response to Ins(1,4,5)P3, as demonstrated by an increase in the EC50 (concn. giving half-maximal effect) to 0.182 +/- 0.024 microM and 0.457 +/- 0.031 microM respectively, as compared with untreated permeabilized cells (EC50 0.091 +/- 0.021 microM). A similar decrease in Ins(1,4,5)P3-sensitive 45Ca2+ release was seen in permeabilized cells from insulin-free conditions of culture (EC50 0.20 +/- 0.061 microM). As altered glomerular haemodynamics are found in insulinopaenic diabetic conditions, it is proposed that a decrease in intracellular Ca2+ availability in response to vasoactive agonists and consequent decrease in mesangial-cell contractility contributes to the hyperfiltration seen in this condition.

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Selected References

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