Effect of extrinsic denervation on muscarinic neurotransmission in the canine ileocolonic region

S. Leelakusolvong, Adil Eddie Bharucha, M. G. Sarr, P. I. Hammond, William Stephen Brimijoin, S. F. Phillips

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

To explore the hypothesis that denervation hypersensitivity increases ileocolonic motor activity after extrinsic denervation, we compared muscarinic neurotransmission in canine ileocolonic loops that were isolated and either extrinsically innervated or extrinsically denervated. We recorded ileal, ileocolonic sphincter (ICS) and colonic pressures, and colonic tone, compliance and relaxation during ileal distention. Muscarinic effects were probed by neostigmine, and minimally effective doses of muscarinic receptor antagonists. Denervation augmented ileal, ICS and colonic contractile activity; colonic high-amplitude propagating contractions (HAPCs) were also augmented; colonic relaxation during ileal distention was abolished. Neostigmine induced HAPCs in both loop preparations. Pirenzipine (M1 antagonist) reduced ileal contractile activity in all loops and reduced colonic relaxation during ileal distention in innervated loops. Pirenzipine also reduced colonic tone and colonic HAPCs, more in denervated loops. Darifenacin (M3 antagonist) reduced ileocolonic contractile activity and tone more than did AF-DX 116 (M2 antagonist) in all loops. Cholinergic receptor subtypes modulate different facets of ileocolonic motor activity in the canine ileocolonic region. Increased sensitivity at M1 muscarinic receptors may partly account for the effects of extrinsic denervation.

Original languageEnglish (US)
Pages (from-to)173-186
Number of pages14
JournalNeurogastroenterology and Motility
Volume15
Issue number2
DOIs
StatePublished - Apr 2003

Fingerprint

Denervation
Synaptic Transmission
Cholinergic Agents
Canidae
Neostigmine
Motor Activity
Muscarinic M1 Receptors
Muscarinic Antagonists
Cholinergic Receptors
Muscarinic Receptors
Compliance
Hypersensitivity
Pressure

Keywords

  • Cholinergic
  • Colonic motility
  • Extrinsic denervation

ASJC Scopus subject areas

  • Physiology
  • Gastroenterology
  • Neuroscience(all)

Cite this

Effect of extrinsic denervation on muscarinic neurotransmission in the canine ileocolonic region. / Leelakusolvong, S.; Bharucha, Adil Eddie; Sarr, M. G.; Hammond, P. I.; Brimijoin, William Stephen; Phillips, S. F.

In: Neurogastroenterology and Motility, Vol. 15, No. 2, 04.2003, p. 173-186.

Research output: Contribution to journalArticle

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