XiaoŠPing Yang and Shigetoshi Chiba*
Department of Pharmacology, Shinshu University School of Medicine, Matsumoto
390Š8621, Japan
*To whom correspondence should be addressed.
Abstract: We tried to induce selective perivascular purinergic
nerve stimulation in isolated canine splenic arterial preparations, using
the cannula insertion method. Under the conditions of periarterial electrical
stimulation (ES), i.e., trains of 1, 3 and 10 pulses, 1Šms pulse duration
and 10ŠV amplitude at 1 Hz, monophasic vasoconstriction was consistently
induced. The ESŠinduced vasoconstriction was not influenced by prazosin
in doses that completely inhibited noradrenalineŠinduced vasoconstrictions,
but it was suppressed by alpha,betaŠmethylene ATP, a P2X purinoceptor desensitizer.
Thus, it is indicated that a selective purinergic transmitter release is
readily obtained in the isolated splenic arterial preparation.
Keywords: Dog splenic artery, Perivascular electric stimulation, P2X
Purinoceptor