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Am J Physiol Heart Circ Physiol 259: H1427-H1432, 1990;
0363-6135/90 $5.00
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AJP - Heart and Circulatory Physiology, Vol 259, Issue 5 1427-H1432, Copyright © 1990 by American Physiological Society

ARTICLES

Pertussis toxin abolishes the effect of neuropeptide Y on rat resistance arteriole contraction

R. Andriantsitohaina, P. Andre and J. C. Stoclet
Laboratoire de Pharmacologie, Cellulaire et Moleculaire, Unite de Recherche Associee Centre National de la Recherche Scientifique D0600, Universite Louis Pasteur de Strasbourg, Faculte de Pharmacie, Illkirch, France.

Pertussis toxin (PTX) was used to investigate the possible involvement of a G protein in the mechanism of action of neuropeptide Y (NPY) on rat mesenteric arterioles. ADP ribosylation of membrane protein was assessed by gel electrophoresis followed by autoradiography. The effect of NPY was studied on contractions elicited either by addition of calcium to depolarized vessels or by the calcium agonist BAY K 8644. Under conditions in which PTX ADP-ribosylated a 40-41 kDa protein, the potentiation of contractions induced by NPY in both protocols was abolished. In contrast, the contraction induced by norepinephrine was unaffected by PTX. It is concluded that a G protein mediates the potentiating effect of NPY on external calcium-dependent contractions in rat mesenteric arterioles.


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[Abstract] [Full Text] [PDF]


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