Abstract
This study examines the action of agonists and antagonists of P2 receptors on mouse mesenteric artery contractions and the possible involvement of these signaling pathways in myogenic tone (MT) evoked by elevated intraluminal pressure. Both ATP and its non-hydrolyzed analog α,β-ATP triggered transient contractions that were sharply decreased in the presence of NF023, a potent antagonist of P2X1 receptors. In contrast, UTP and UDP elicited sustained contractions which were suppressed by MRS2567, a selective antagonist of P2Y6 receptors. Inhibition of Na+, K+, 2Cl− cotransport (NKCC) with bumetanide led to attenuation of contractions in UTP- but not ATP-treated arteries. Both UTP-induced contractions and MT were suppressed by MRS2567 and bumetanide but were insensitive to NF023. These data implicate a P2Y6-mediated, NKCC-dependent mechanism in MT of mesenteric arteries. The action of heightened intraluminal pressure on UTP release from mesenteric arteries and its role in the triggering of P2Y6-mediated signaling should be examined further.
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This work was supported by grants from the Canadian Institutes of Health Research and the Heart and Stroke Foundation of Canada. The editorial assistance of Ovid Da Silva (irtc.inc@hotmail.com) is acknowledged.
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Koltsova, S.V., Maximov, G.V., Kotelevtsev, S.V. et al. Myogenic tone in mouse mesenteric arteries: evidence for P2Y receptor-mediated, Na+, K+, 2Cl− cotransport-dependent signaling. Purinergic Signalling 5, 343–349 (2009). https://doi.org/10.1007/s11302-009-9160-4
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DOI: https://doi.org/10.1007/s11302-009-9160-4