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Investigation of Endogenous of Guinea Pig Gallbladder Using Nicotinic Agonist Stimulation

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Abstract

Gallbladder motility is modulated by intrinsicnerves, the identities of which are not wellestablished. The aim of this study was to determine theeffect of nicotinic receptor stimulation of intrinsic nerves on gallbladder muscle contractility.Guinea pig gallbladder muscle strips were studied invitro . Histamine 1 μM was used to increase baselinetone. The nicotinic receptor agonist,1,1-dimethyl-4-phenylpiperazinium (DMPP), produced a biphasic responsecharacterized by an initial transient contractionfollowed by a sustained relaxation. The initialcontraction was inhibited by the neural blockertetrodotoxin, the nicotinic antagonist hexamethonium, and the muscarinicantagonist atropine, but not by a substance P receptorantagonist or a bombesin receptor antagonist. Therelaxation response to DMPP was not affected bytetrodotoxin, but was reduced by hexamethonium andomega-conotoxin GVIA, an inhibitor of neurotransmitterrelease. The relaxation response was reduced by thenitric oxide synthase inhibitor L-NAME, but not by avasoactive intestinal peptide antagonist or propranolol.DMPP produces a biphasic response in the guinea piggallbladder. The initial contractile response ismediated by nicotinic receptors on the cell body or axon of cholinergic nerves. The relaxation responseappears to result, in part, from activation of nicotinicreceptors on nerve terminals of nitric oxide-releasingnerves. These results suggest nicotinic receptors have heterogeneity in location depending onexcitatory or inhibitory neuronal function.

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Parkman, H.P., Pagano, A.P. & Ryan, J.P. Investigation of Endogenous of Guinea Pig Gallbladder Using Nicotinic Agonist Stimulation. Dig Dis Sci 43, 2237–2243 (1998). https://doi.org/10.1023/A:1026662521485

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  • DOI: https://doi.org/10.1023/A:1026662521485

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