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. 1990 Mar;85(3):790–797. doi: 10.1172/JCI114505

Endothelin-1 stimulates contraction of rat glomerular mesangial cells and potentiates beta-adrenergic-mediated cyclic adenosine monophosphate accumulation.

M S Simonson 1, M J Dunn 1
PMCID: PMC296496  PMID: 2155927

Abstract

The newly isolated peptide, endothelin-1 (ET-1), is a potent pressor agent that reduces GFR and the glomerular ultrafiltration coefficient. Recent evidence demonstrates that ET-1 mobilizes intracellular Ca2+ [( Ca2+]i) in glomerular mesangial cells by activating the phosphoinositide cascade. The present experiments were designed to examine whether ET-1 stimulates mesangial cell contraction and regulates the synthesis of PGE2 and cAMP, which dampen vasoconstrictor-induced mesangial contraction. ET-1 (greater than or equal to 1 nM) reduced the cross-sectional area of rat mesangial cells cultured on three-dimensional gels of collagen type I. ET-1 also caused complex rearrangements of F-actin microfilaments consistent with a motile response. Contraction in response to ET-1 occurred only at concentrations that activate phospholipase C, and contraction was unaffected by blockade of dihydropyridine-sensitive Ca2+ channels. Elevation of [Ca2+]i with ionomycin, to equivalent concentrations of [Ca2+]i achieved with ET-1, also reduced mesangial cell cross-sectional area. ET-1 (0.1 microM) also evoked [3H]arachidonate release and a fivefold increase in PGE2 synthesis as well as increased synthesis of PGF2 alpha and small changes of TXB2. ET-1 caused a minor increase in intracellular cAMP accumulation only in the presence of 3-isobutyl-1-methylxanthine. ET-1 also amplified cAMP production in response to isoproterenol. TPA and ionomycin, alone and in combination, failed to mimic the potentiating effect of ET-1; however, indomethacin blocked ET-1-induced potentiation of isoproterenol-stimulated cAMP, which was restored by addition of exogenous 10 nM PGE2. Thus the present data demonstrate that ET-1 stimulates mesangial cell contraction via pharmacomechanical coupling and activates phospholipase A2 to produce PGE2, PGF2 alpha, and TXB2. ET-1 also amplified beta adrenergic-stimulated cAMP accumulation by a PGE2-dependent mechanism.

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Selected References

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