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KMID : 1149220190270040237
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Korean Journal of Oriental Medical Prescription
2019 Volume.27 No. 4 p.237 ~ p.244
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Effects of Carthami flos on pacemaker potentials of small intestinal and colonic interstitial Cells of Cajal
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Kim Byung-Joo
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Abstract
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Objectives : The purpose of this study was to investigate the effects of Carthami flos on pacemaker potentials of small intestinal and colonic Interstitial Cells of Cajal (ICC).
Methods : To dissociate the ICC, we used enzymatic digestions from the small intestine and colon in mice. In the ICC, the electrophysiological whole-cell patch-clamp configuration was used to record pacemaker potentials in the cultured ICC.
Results : 1. The ICC generated pacemaker potentials in the murine small intestine and colon. 2. Pretreatment with a Ca2+ free solution and thapsigargin, a Ca2+-ATPase inhibitor in the endoplasmic reticulum, stopped the pacemaker potentials. In the case of Ca2+-free solutions, Carthami flos did not induce membrane depolarizations in the murine small intestine and colon. However, when thapsigargin in a bath solution was applied, Carthami flos induced membrane depolarizations only in the murine colon. 3. Pretreatment with 2-APB (transient receptor potential melastatin (TRPM) channel inhibitor) abolished the pacemaker potentials and suppressed Carthami flos-induced effects in the murine small intestine and colon. 4. However, pretreatment with T16Ainh-AO1 (Ca2+ activated Cl- channel; anoctamin 1 (ANO1) inhibitor) did not affect the pacemaker potentials and induced Carthami flos-induced effects only in the murine small intestine.
Conclusions : These results suggest that Carthami flos can modulate the pacemaker activity of ICC and the mechanisms underlying pacemaking in ICC might be different in the small intestine and the colon.
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KEYWORD
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Carthami flos, Interstitial Cells of Cajal, Pacemaker potentials
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