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KMID : 0811720100140020083
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Korean Journal of Physiology & Pharmacology
2010 Volume.14 No. 2 p.83 ~ p.89
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The Inhibitory Effects of Hydrogen Sulfide on Pacemaker Activity of Interstitial Cells of Cajal from Mouse Small Intestine
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Parajuli Shankar Prasad
Choi Seok
Lee Jun
Kim Young-Dae
Park Chan-Guk
Kim Man-Yoo
Kim Hyun-Il
Yeum Cheol-Ho
Jun Jae-Yeoul
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Abstract
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In this study, we studied whether hydrogen sulfide (H2S) has an effect on the pacemaker activity of interstitial cells of Cajal (ICC), in the small intestine of mice. The actions of H2S on pacemaker activity were investigated using whole-cell patch-clamp technique, intracellular Ca2＋ analysis at 30oC and RT-PCR in cultured mouse intestinal ICC. Exogenously applied sodium hydrogen sulfide (NaHS), a donor of hydrogen sulfide, caused a slight tonic inward current on pacemaker activity in ICC at low concentrations (50 and 100?M), but at high concentration (500?M and 1 mM) it seemed to cause light tonic inward currents and then inhibited pacemaker amplitude and pacemaker frequency, and also an increase in the resting currents in the outward direction. Glibenclamide or other potassium channel blockers (TEA, BaCl2, apamin or 4-aminopydirine) did not have an effect on NaHS-induced action in ICC. The exogenous application of carbonilcyanide p-triflouromethoxyphenylhydrazone (FCCP) and thapsigargin also inhibited the pacemaker activity of ICC as NaHS. Also, we found NaHS inhibited the spontaneous intracellular Ca2＋ ([Ca2＋]i) oscillations in cultured ICC. In doing an RT-PCR experiment, we found that ICC enriched population lacked mRNA for both CSE and CBS, but was prominently detected in unsorted muscle. In conclusion, H2S inhibited the pacemaker activity of ICC by modulating intracellular Ca2＋. These results can serve as evidence of the physiological action of H2S as acting on the ICC in gastrointestinal (GI) motility.
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KEYWORD
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Interstitial cells of Cajal (ICC), Intestinal motility, Pacemaker currents, Sodium hydrogen sufide (NaHS)
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