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. 1992 Oct;107(2):456–462. doi: 10.1111/j.1476-5381.1992.tb12767.x

A pertussis toxin-sensitive mechanism of endothelin action in porcine coronary artery smooth muscle.

Y Kasuya 1, Y Takuwa 1, M Yanagisawa 1, T Masaki 1, K Goto 1
PMCID: PMC1907892  PMID: 1330178

Abstract

1. Endothelin-1 (ET-1)-induced contraction of porcine coronary artery strips may be mediated via at least two intracellular signalling mechanisms, the activation of dihydropyridine-sensitive voltage-dependent Ca2+ channels and the stimulation of phosphoinositide breakdown. Here we have investigated the possible involvement of pertussis toxin (PT)-sensitive guanosine-5'-triphosphate (GTP)-binding proteins (G-proteins) in ET-1-induced activation of these two signalling pathways in porcine coronary artery smooth muscle. 2. Increase in extracellular K+ concentration (10, 15 mM) shifted the dose-response relationship for the ET-1-induced contraction to the left. 3. The dihydropyridine Ca2+ channel blocker, nifedipine (10(-8) M), induced a rightward shift in the dose-response curve for ET-1. Pretreatment of the arterial strips with PT (0.1 microgram ml-1) induced a similar rightward shift of the ET-1 dose-response curve but not of the KCl response. Nifedipine (10(-8) M) did not further attenuate the ET-1-induced contraction in the PT-pretreated strips. 4. The pretreatment with PT significantly reduced 45Ca2+ uptake of the arterial strips stimulated by ET-1, but had no effect on ET-1-induced production of inositol phosphates. 5. The contractile response of the arterial strips to phorbol dibutyrate, an active phorbol ester, was not significantly affected by 10(-8) M nifedipine. 6. We confirmed that the pretreatment of the tissue with PT induced ADP-ribosylation of a 41 kDa membrane protein.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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