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자료유형
학술저널
저자정보
Chan Guk Park (Department of Internal Medicine College of Medicine Chosun University Gwangju Korea) Mei Jin Wu (Department of Medicine Graduate School Chosun University Gwangju Korea) Chansik Hong (Department of Medicine Graduate School Chosun University Gwangju Korea) Ju Yeon Jo (Department of Internal Medicine College of Medicine Chosun University Gwangju Korea) Han Yi Jiao (Department of Medicine Graduate School Chosun University Gwangju Korea) Hyun Park (Department of Physiology College of Medicine Chosun University Gwangju Korea) Jae Yeoul Jun (Department of Medicine Graduate School Chosun University Gwangju Korea) Seok Choi (Department of Medicine Graduate School Chosun University Gwangju Korea)
저널정보
대한소화관운동학회(현 대한소화기능성질환.운동학회) Journal of Neurogastroenterology and Motility (JNM) Journal of Neurogastroenterology and Motility (JNM) Vol.24 No.1
발행연도
2018.1
수록면
128 - 137 (10page)

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Background/Aims We investigated the role of representative endoplasmic reticulum proteins, stromal interaction molecule 1 (STIM1), and store-operated calcium entry-associated regulatory factor (SARAF) in pacemaker activity in cultured interstitial cells of Cajal (ICCs) isolated from mouse small intestine. Methods The whole-cell patch clamp technique applied for intracellular calcium ions ([Ca2+]i) analysis with STIM1 or SARAF overexpressed cultured ICCs from mouse small intestine. Results In the current-clamping mode, cultured ICCs displayed spontaneous pacemaker potentials. External carbachol exposure produced tonic membrane depolarization in the current-clamp mode, which recovered within a few seconds into normal pacemaker potentials. In STIM1-overexpressing cultured ICCs pacemaker potential frequency was increased, and in SARAF-overexpressing ICCs pacemaker potential frequency was strongly inhibited. The application of gadolinium (a non-selective cation channel inhibitor) or a Ca2+-free solution to understand Orai channel involvement abolished the generation of pacemaker potentials. When recording intracellular Ca2+ concentration with Fluo 3-AM, STIM1-overexpressing ICCs showed an increased number of spontaneous intracellular Ca2+ oscillations. However, SARAF-overexpressing ICCs showed fewer spontaneous intracellular Ca2+ oscillations. Conclusion Endoplasmic reticulum proteins modulated the frequency of pacemaker activity in ICCs, and levels of STIM1 and SARAF may determine slow wave patterns in the gastrointestinal tract.

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