Colonic giant migrating contractions induced by glycerol enema in anesthetized rats.
Colonic motility was measured with three catheter pressure transducers that were inserted into the descending colon at the distance of 4 cm, 6 cm and 8 cm from the anal verge in anesthetized rats. Colonic infusion of glycerol (65%, 2 ml/kg) induced large phasic pressure changes with high amplitude and long duration. Some of the pressure changes propagated over all the three recording sites, appearing to be equivalent to giant migrating contractions. These glycerol-induced large propulsions were abolished by lidocaine (5%, 2 ml/kg, intracolon), hexamethonium (10 mg/kg, i.v.) or clonidine (30 micrograms/kg, i.v.); and they were almost entirely suppressed by atropine (3 mg/kg, i.v.), suggesting the principal involvement of the cholinergic neural pathway.
Tomaru
A
A
Department of Pharmacology, Pharmaceutical Research Laboratories, Kyowa Hakko Kogyo Co., Ltd., Shizuoka, Japan.
Ishii
A
A
Kishibayashi
N
N
Karasawa
A
A
D000818:Animals; D001285:Atropine / Q000494:pharmacology; D002404:Catheterization; D003000:Clonidine / Q000494:pharmacology; D003106:Colon / Q000187:drug effects* / Q000502:physiology; D004733:Enema; D005730:Ganglionic Blockers / Q000494:pharmacology; D005769:Gastrointestinal Motility / Q000187:drug effects*; D005990:Glycerol / Q000008:administration & dosage / Q000494:pharmacology*; D018738:Hexamethonium; D006584:Hexamethonium Compounds / Q000494:pharmacology; D008012:Lidocaine / Q000494:pharmacology; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects*; D051381:Rats; D017208:Rats, Wistar
D005730:Ganglionic Blockers; D006584:Hexamethonium Compounds; D018738:Hexamethonium; D001285:Atropine; D008012:Lidocaine; D003000:Clonidine; D005990:Glycerol