Prejunctional and postjunctional actions of heptanol and 18β-glycyrretinic acid in the rodent vas deferens

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Prejunctional and postjunctional actions of heptanol and 18β-glycyrretinic acid in the rodent vas deferens

Heptanol and 18 beta-glycyrrhetinic acid (18 beta GA) block gap junctions, but have other actions on transmitter release that have not been characterised. This study investigates the prejunctional and postjunctional effects of these compounds in guinea pig and mouse vas deferens using intracellular electrophysiological recording and confocal Ca(2+) imaging of sympathetic nerve terminals. In mic...

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Effects of heptanol and carbenoxolone on noradrenaline induced contractions in guinea pig vas deferens.

We examined the effects of two putative gap junction blockers, heptanol and carbenoxolone, on noradrenaline-induced contractions in guinea pig vas deferens. The force generated due to the exogenously added noradrenaline (20 microM) consisted of two components: the tonic and the oscillatory. 2 mM heptanol abolished the oscillatory contractions and drastically suppressed both the maximum force (b...

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Prejunctional and postjunctional actions of endogenous norepinephrine at the sympathetic neuroeffector junction in canine coronary arteries.

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Mechanisms underlying postjunctional synergism between responses of the vas deferens to noradrenaline and ATP.

Mechanisms of postjunctional synergism between adenosine 5'-triphosphate (ATP) and noradrenaline were studied in isolated guinea pig vas deferens. Whereas prior exposure to ATP had no significant effect on noradrenaline-mediated contractions, noradrenaline concentration-dependently enhanced ATP-induced contractions. Similarly to noradrenaline, histamine, which also acts via phospholipase-couple...

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ژورنال

عنوان ژورنال: Autonomic Neuroscience

سال: 2009

ISSN: 1566-0702

DOI: 10.1016/j.autneu.2009.03.006