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Poncirus trifoliate fruit modulates pacemaker activity in interstitial cells of Cajal from the murine small intestine

Title
Poncirus trifoliate fruit modulates pacemaker activity in interstitial cells of Cajal from the murine small intestine
Author
김선정
Keywords
Poncirus trifoliata (L) Raf. (Rutaceae); Interstitial Cells of Cajal; 5-hydroxytryptamine; Gastrointestinal Motility
Issue Date
2013-08
Publisher
Elsevier Science B.V., Amsterdam.
Citation
Journal of Ethnopharmacology, Oct 2013, 149(3), P.668-675
Abstract
Ethnopharmacological relevance: Poncirus fructus (PF) has been widely used as a traditional medicine in Eastern Asia, especially to ameliorate the symptoms of gastrointestinal (GI) disorders related to abnormal GI motility.Aim of the study: Poncirus fructus (PF), also known as Poncirus trifoliata (L) Raf. (Rutaceae), is widely used as a traditional medicine in Eastern Asia mainly to ameliorate the symptoms of gastrointestinal (GI) disorders related to abnormal GI motility. In a previous study, a methanol extract of PF was found to have particularly potent gastroprokinetic effects. Interstitial cells of Cajal (ICCs) are pacemaker cells in the gastrointestinal tract, but the action mechanisms of PF extract in mouse small intestinal ICCs have not been investigated. Therefore, in the present study, we investigated the effects of a methanol extract of PF (MPF) in mouse small intestinal ICCs. In addition, we sought to identify the receptors involved.Materials and Methods: Enzymatic digestions were used to dissociate ICCs from small intestines. The whole-cell patch-clamp configuration was used to record potentials (current clamp) from cultured ICCs. In addition, we analyzed intracellular Ca2+ concentrations ([Ca2+](i)).Results: MPF decreased the amplitudes of pacemaker potentials in ICCs, and depolarized resting membrane potentials in a concentration dependent manner. Y25130 (a 5-HT3 receptor antagonist) and RS39604 (a 5-HT4 receptor antagonist) blocked MPF-induced membrane depolarizations, whereas SB269970 (a 5-HT7 receptor antagonist) did not. Pretreatment with Na+ or Ca2+-free solution or thapsigargin (a Ca2+-ATPase inhibitor in endoplasmic reticulum) abolished the generation of pacemaker potentials and suppressed MPF-induced activity. [Ca2+](i) analysis showed that MPF increased [Ca2+](i). Furthermore, treatments with PD 98059, SB203580, or JNK II inhibitor blocked MPF-induced membrane depolarizations in ICCs.Conclusion: These results suggest that MPF modulates pacemaker potentials through 5-HT3 and 5-HT4 receptor-mediated pathways via external Na+ and Ca2+ influx, and via Ca2+ release from internal stores in a mitogen-activated protein kinase dependent manner. The study shows MPF is a good candidate for the development of a gastroprokinetic agent. In view of the effects of MPF on ICCs, further research is required, particularly to identify the active compound(s) involved and to determine their action mechanisms. (C) 2013 Elsevier Ireland Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0378874113005060?via%3Dihubhttp://hdl.handle.net/20.500.11754/45409
ISSN
0378-8741
DOI
10.1016/j.jep.2013.07.017
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRICAL AND BIOMEDICAL ENGINEERING(전기·생체공학부) > Articles
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