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• W2512179905 abstract "Enteric inhibitory motoneurons use nitric oxide and a purine neurotransmitter to relax gastrointestinal smooth muscle. Enteric P/Q-type Ca 2+ channels contribute to excitatory neuromuscular transmission; their contribution to inhibitory transmission is less clear. We used the colon from tottering mice ( tg/tg, loss of function mutation in the α1A pore-forming subunit of P/Q-type Ca 2+ channels) to test the hypothesis that P/Q-type Ca 2+ channels contribute to inhibitory neuromuscular transmission and colonic propulsive motility. Fecal pellet output in vivo and the colonic migrating motor complex (ex vivo) were measured. Neurogenic circular muscle relaxations and inhibitory junction potentials (IJPs) were also measured ex vivo. Colonic propulsive motility in vivo and ex vivo was impaired in tg/tg mice. IJPs were either unchanged or somewhat larger in tissues from tg/tg compared with wild-type (WT) mice. Nifedipine (L-type Ca 2+ channel antagonist) inhibited IJPs by 35 and 14% in tissues from tg/tg and WT mice, respectively. The contribution of N- and R-type channels to neuromuscular transmission was larger in tissues from tg/tg compared with WT mice. The resting membrane potential of circular muscle cells was similar in tissues from tg/tg and WT mice. Neurogenic relaxations of circular muscle from tg/tg and WT mice were similar. These results demonstrate that a functional deficit in P/Q-type channels does not alter propulsive colonic motility. Myenteric neuron L-type Ca 2+ channel function increases to compensate for loss of functional P/Q-type Ca 2+ channels. This compensation maintains inhibitory neuromuscular transmission and normal colonic motility." @default.
• W2512179905 created "2016-09-16" @default.
• W2512179905 creator A5043501776 @default.
• W2512179905 creator A5067123127 @default.
• W2512179905 creator A5071199273 @default.
• W2512179905 creator A5085256874 @default.
• W2512179905 date "2016-10-01" @default.
• W2512179905 modified "2023-09-27" @default.
• W2512179905 title "Upregulation of L-type calcium channels in colonic inhibitory motoneurons of P/Q-type calcium channel-deficient mice" @default.
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• W2512179905 doi "https://doi.org/10.1152/ajpgi.00263.2016" @default.
• W2512179905 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5142195" @default.
• W2512179905 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27586650" @default.
• W2512179905 hasPublicationYear "2016" @default.
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