Evidence That The P 1 ‐purinoceptor In The Guinea‐pig Taenia Coli Is An A 2 ‐subtype

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supplying the taenia coli as well as from NANC inhibitory nerves. The excitatory junction potentials (EJPs) recorded in the vas deferens were blocked by a,b-meATP, a selective desensitizer of P2X receptors (Figures 2(a) and 2(b)). This finding clearly supported the earlier demonstration of sympathetic cotransmis-

Short- and long-term (trophic) purinergic signalling

produce short-term purinergic signalling from inhibitory enteric nerves in the guinea pig taenia coli [2] and from excitatory parasympathetic nerves in the urinary bladder [10]. Short-term purinergic signalling was demonstrated when ATP was identified as a cotransmitter with noradrenaline in

Effects of excitatory and inhibitory neurotransmission on

et al., 2006). P2X purinoceptor agonists cause muscle contraction in the guinea pig ileum (Matsuo et al., 1997) and induce muscle relaxation in the taenia coli and proximal colon (Bultmann et al., 1996). Excitatory neuromuscular transmission seems to be mostly cholinergic in the gastro-intestinal tract (Sarna, 2006); however, some recent studies

Adenosine triphosphate as a neurotransmitter and neuromodulator

Evidence that ATP was the NANC inhibitory transmitter in nerves supplying the guinea-pig taenia coli was first presented in 1970. In the late 1970s evidence was presented for vasoactive intestinal polypeptide (VIP) as a slow NANC inhibitory transmitter in the gut. The current