title: Effects of trimebutine maleate on colonic motility through Ca²+-activated K+ channels and L-type Ca²+ channels.
abstract: The effects of trimebutine maleate (TM) on spontaneous contractions of colonic longitudinal muscle were investigated in guinea pigs. The contractile responses of smooth muscle strips were recorded by an isometric force transducer. Membrane and action potentials were detected by an intracellular microelectrode technique. The whole-cell patch clamp recording technique was used to record the changes in large conductance Ca(2+)-activated K(+) (BK(ca)) and L-type Ca(2+) currents in colonic smooth muscle cells. At high concentrations (30, 100, and 300 μM), TM inhibited the amplitude of spontaneous contractions. At low concentrations (1 and 10 μM), TM attenuated the frequency and tone of smooth muscle strips, whereas TM had no influence on the amplitude of spontaneous contractions. TM depolarized the membrane potentials, but decreased the amplitude and frequency of action potentials at high concentrations. TM inhibited BK(ca) and L-type Ca(2+) currents in a dose-dependent manner. In the presence of the BK(ca) channel opener, NS1619, TM also inhibited BK(ca) currents. Bayk8644, a L-type Ca(2+) channel opener, increased L-type Ca(2+) currents. This augmentation was also attenuated by TM. These results suggest that TM attenuates intestinal motility through inhibition of L-type Ca(2+) currents, and depolarizes membrane potentials by reducing BK(ca) currents. Thus, TM may be a multiple-ion channel regulator in the gastrointestinal tract.
authors: Department of Gastroenterology, Renmin Hospital of Wuhan University, Wuhan 430060, China.
authors: Wei
authors: W
authors: Tan
authors: Hong
authors: H
authors: Zhang
authors: He-Sheng
authors: HS
authors: Luo
authors: Hong
authors: H
authors: Xia
mesh_terms: D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D020746:Calcium Channels, L-Type / Q000187:drug effects* / Q000378:metabolism; D003106:Colon / Q000187:drug effects / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D005765:Gastrointestinal Agents / Q000008:administration & dosage / Q000494:pharmacology*; D005769:Gastrointestinal Motility / Q000187:drug effects; D006168:Guinea Pigs; D008297:Male; D008564:Membrane Potentials / Q000187:drug effects; D009119:Muscle Contraction / Q000187:drug effects; D018408:Patch-Clamp Techniques; D024681:Potassium Channels, Calcium-Activated / Q000037:antagonists & inhibitors* / Q000378:metabolism; D014287:Trimebutine / Q000008:administration & dosage / Q000494:pharmacology*
chemical_list: D020746:Calcium Channels, L-Type; D005765:Gastrointestinal Agents; D024681:Potassium Channels, Calcium-Activated; D014287:Trimebutine