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Huang X, Choi S, Wu W, Shahi PK, Lee JH, Hong C, Jun JY. 5-Hydroxytryptamine Enhances the Pacemaker Activity of Interstitial Cells of Cajal in Mouse Colon. Int J Mol Sci 2024; 25:3997. [PMID: 38612808 PMCID: PMC11012597 DOI: 10.3390/ijms25073997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 04/02/2024] [Accepted: 04/02/2024] [Indexed: 04/14/2024] Open
Abstract
We examined the localization of the 5-hydroxytryptamine (5-HT) receptor and its effects on mouse colonic interstitial cells of Cajal (ICCs) using electrophysiological techniques. Treatment with 5-HT increased the pacemaker activity in colonic ICCs with depolarization of membrane potentials in a dose-dependent manner. Hyperpolarization-activated cyclic nucleotide-gated (HCN) channel blockers blocked pacemaker activity and 5-HT-induced effects. Moreover, an adenylate cyclase inhibitor inhibited 5-HT-induced effects, and cell-permeable 8-bromo-cAMP increased the pacemaker activity. Various agonists of the 5-HT receptor subtype were working in colonic ICCs, including the 5-HT4 receptor. In small intestinal ICCs, 5-HT depolarized the membrane potentials transiently. Adenylate cyclase inhibitors or HCN blockers did not show any influence on 5-HT-induced effects. Anoctamin-1 (ANO1) or T-type Ca2+ channel blockers inhibited the pacemaker activity of colonic ICCs and blocked 5-HT-induced effects. A tyrosine protein kinase inhibitor inhibited pacemaker activity in colonic ICCs under controlled conditions but did not show any influence on 5-HT-induced effects. Among mitogen-activated protein kinase (MAPK) inhibitors, a p38 MAPK inhibitor inhibited 5-HT-induced effects on colonic ICCs. Thus, 5-HT's effect on pacemaker activity in small intestinal and colonic ICCs has excitatory but variable patterns. ANO1, T-type Ca2+, and HCN channels are involved in 5-HT-induced effects, and MAPKs are involved in 5-HT effects in colonic ICCs.
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Affiliation(s)
- Xingyou Huang
- Department of Physiology, College of Medicine, Chosun University, Gwangju 61452, Republic of Korea; (X.H.); (S.C.); (W.W.); (P.K.S.); (C.H.)
| | - Seok Choi
- Department of Physiology, College of Medicine, Chosun University, Gwangju 61452, Republic of Korea; (X.H.); (S.C.); (W.W.); (P.K.S.); (C.H.)
| | - Wenhao Wu
- Department of Physiology, College of Medicine, Chosun University, Gwangju 61452, Republic of Korea; (X.H.); (S.C.); (W.W.); (P.K.S.); (C.H.)
| | - Pawan Kumar Shahi
- Department of Physiology, College of Medicine, Chosun University, Gwangju 61452, Republic of Korea; (X.H.); (S.C.); (W.W.); (P.K.S.); (C.H.)
| | - Jun Hyung Lee
- Department of Internal Medicine, College of Medicine, Chosun University, Gwangju 61452, Republic of Korea;
| | - Chansik Hong
- Department of Physiology, College of Medicine, Chosun University, Gwangju 61452, Republic of Korea; (X.H.); (S.C.); (W.W.); (P.K.S.); (C.H.)
| | - Jae Yeoul Jun
- Department of Physiology, College of Medicine, Chosun University, Gwangju 61452, Republic of Korea; (X.H.); (S.C.); (W.W.); (P.K.S.); (C.H.)
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Beverley KM, Steffen JT, Heyrman JA, Shahi PK, Pattnaik BR. Kir7.1 Disease Mutation in the Inner Pore is Critical for K+ Permeation. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.04731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Zuo DC, Choi S, Shahi PK, Kim MY, Park CG, Kim YD, Lee J, Chang IY, So I, Jun JY. Inhibition of pacemaker activity in interstitial cells of Cajal by LPS via NF-κB and MAP kinase. World J Gastroenterol 2013; 19:1210-1218. [PMID: 23482668 PMCID: PMC3587477 DOI: 10.3748/wjg.v19.i8.1210] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Revised: 12/21/2012] [Accepted: 01/19/2013] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate lipopolysaccharide (LPS) related signal transduction in interstitial cells of Cajal (ICCs) from mouse small intestine.
METHODS: For this study, primary culture of ICCs was prepared from the small intestine of the mouse. LPS was treated to the cells prior to measurement of the membrane currents by using whole-cell patch clamp technique. Immunocytochemistry was used to examine the expression of the proteins in ICCs.
RESULTS: LPS suppressed the pacemaker currents of ICCs and this could be blocked by AH6809, a prostaglandin E2-EP2 receptor antagonist or NG-Nitro-L-arginine Methyl Ester, an inhibitor of nitric oxide (NO) synthase. Toll-like receptor 4, inducible NO synthase or cyclooxygenase-2 immunoreactivity by specific antibodies was detected on ICCs. Catalase (antioxidant agent) had no action on LPS-induced action in ICCs. LPS actions were blocked by nuclear factor κB (NF-κB) inhibitor, actinomycin D (a gene transcription inhibitor), PD 98059 (a p42/44 mitogen-activated protein kinases inhibitor) or SB 203580 [a p38 mitogen-activated protein kinases (MAPK) inhibitor]. SB 203580 also blocked the prostaglandin E2-induced action on pacemaker currents in ICCs but not NO.
CONCLUSION: LPS inhibit the pacemaker currents in ICCs via prostaglandin E2- and NO-dependent mechanism through toll-like receptor 4 and suggest that MAPK and NF-κB are implicated in these actions.
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Kim YD, Han KT, Lee J, Park CG, Kim MY, Shahi PK, Zuo DC, Choi S, Jun JY. Effects of sphingosine-1-phosphate on pacemaker activity of interstitial cells of Cajal from mouse small intestine. Mol Cells 2013; 35:79-86. [PMID: 23307289 PMCID: PMC3887851 DOI: 10.1007/s10059-013-2282-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Revised: 12/03/2012] [Accepted: 12/03/2012] [Indexed: 01/28/2023] Open
Abstract
Interstitial cells of Cajal (ICC) are the pacemaker cells that generate the rhythmic oscillation responsible for the production of slow waves in gastrointestinal smooth muscle. Spingolipids are known to present in digestive system and are responsible for multiple important physiological and pathological processes. In this study, we are interested in the action of sphingosine 1-phosphate (S1P) on ICC. S1P depolarized the membrane and increased tonic inward pacemaker currents. FTY720 phosphate (FTY720P, an S1P(1,3,4,5) agonist) and SEW 2871 (an S1P(1) agonist) had no effects on pacemaker activity. Suramin (an S1P(3) antagonist) did not block the S1P-induced action on pacemaker currents. However, JTE-013 (an S1P(2) antagonist) blocked the S1P-induced action. RT-PCR revealed the presence of the S1P(2) in ICC. Calphostin C (a protein kinase C inhibitor), NS-398 (a cyclooxygenase-2 inhibitor), PD 98059 (a p42/44 inhibitor), or SB 203580 (a p38 inhibitor) had no effects on S1P-induced action. However, c-jun NH(2)-terminal kinase (JNK) inhibitor II suppressed S1P-induced action. External Ca(2+)-free solution or thapsigargin (a Ca(2+)-ATPase inhibitor of endoplasmic reticulum) suppressed action of S1P on ICC. In recording of intracellular Ca(2+) ([Ca(2+)](i)) concentration using fluo-4/AM S1P increased intensity of spontaneous [Ca(2+)](i) oscillations in ICC. These results suggest that S1P can modulate pacemaker activity of ICC through S1P(2) via regulation of external and internal Ca(2+) and mitogenactivated protein kinase activation.
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Affiliation(s)
- Young Dae Kim
- Department of Physiology, Department of Internal Medicine, College of Medicine, Chosun University, Gwangju 501-759,
Korea
| | - Kyoung Taek Han
- Department of Physiology, Department of Internal Medicine, College of Medicine, Chosun University, Gwangju 501-759,
Korea
| | - Jun Lee
- Department of Physiology, Department of Internal Medicine, College of Medicine, Chosun University, Gwangju 501-759,
Korea
| | - Chan Guk Park
- Department of Physiology, Department of Internal Medicine, College of Medicine, Chosun University, Gwangju 501-759,
Korea
| | - Man Yoo Kim
- Department of Physiology, Department of Internal Medicine, College of Medicine, Chosun University, Gwangju 501-759,
Korea
| | | | | | | | - Jae Yeoul Jun
- Department of Physiology, Department of Internal Medicine, College of Medicine, Chosun University, Gwangju 501-759,
Korea
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Zuo DC, Choi S, Shahi PK, Kim MY, Park CG, Kim YD, Lee J, Chang IY, Lee HS, Yeom SC, Moon HJ, Seong SY, So I, Jun JY. Action of lipopolysaccharide on interstitial cells of cajal from mouse small intestine. Pharmacology 2012; 90:151-9. [PMID: 22890360 DOI: 10.1159/000340018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Accepted: 06/08/2012] [Indexed: 11/19/2022]
Abstract
BACKGROUND AND PURPOSE Lipopolysaccharide (LPS) induces intestinal dysmotility by alteration of smooth muscle and enteric neuronal activities. However, there is no report on the modulatory effects of LPS on the interstitial cells of Cajal (ICCs). We investigated the effect of LPS and its signal transduction in ICCs. METHODS We performed whole-cell patch clamp and RT-PCR in cultured ICCs from mouse small intestine. RESULTS LPS suppressed the generation of pacemaker currents of ICCs. The mRNA transcripts for Toll-like receptor 4 (TLR4) were expressed in ICCs. However, the inhibitory action of LPS on pacemaker currents from TLR4(+/+) mice was not present in TLR4(-/-) mice. The inhibitory effects of LPS on ICCs were blocked by glibenclamide (an inhibitor of ATP-sensitive K(+) channels), NS-398 (a COX-2 inhibitor), AH6808 [a prostaglandin E(2) (PGE(2))-EP(2) receptor antagonist], ODQ (an inhibitor of guanylate cyclase) and L-NAME [an inhibitor of nitric oxide synthase (NOS)]. Furthermore, genistein and herbimycin A (tyrosine kinase inhibitors) blocked the LPS-induced inhibitory action on pacemaker activity in ICCs. CONCLUSIONS LPS can activate ICCs to release NO and PGE(2) through TLR4 activation. The released NO and PGE(2) inhibit pacemaker currents by activating ATP-sensitive K(+) channels. The LPS actions are mediated by tyrosine kinase signaling pathways.
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Affiliation(s)
- Dong Chuan Zuo
- Departments of Physiology, College of Medicine, Chosun University, Gwangju, Korea
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Lee J, Kim YD, Park CG, Kim MY, Chang IY, Zuo DC, Shahi PK, Choi S, Yeum CH, Jun JY. Neurotensin modulates pacemaker activity in interstitial cells of Cajal from the mouse small intestine. Mol Cells 2012; 33:509-16. [PMID: 22441675 PMCID: PMC3887726 DOI: 10.1007/s10059-012-2290-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Revised: 02/23/2012] [Accepted: 02/24/2012] [Indexed: 01/25/2023] Open
Abstract
Neurotensin, a tridecapeptide localized in the gut to discrete enteroendocrine cells of the small bowel mucosa, is a hormone that plays an important role in gastrointestinal secretion, growth, and motility. Neurotensin has inhibitory and excitatory effects on peristaltic activity and produces contractile and relaxant responses in intestinal smooth muscle. Our objective in this study is to investigate the effects of neurotensin in small intestinal interstitial cells of Cajal (ICC) and elucidate the mechanism. To determine the electrophysiological effects of neurotensin on ICC, whole-cell patch clamp recordings were performed in cultured ICC from the small intestine. Exposure to neurotensin depolarized the membrane of pacemaker cells and produced tonic inward pacemaker currents. Only neurotensin receptor1 was identified when RT-PCR and immunocytochemistry were performed with mRNA isolated from small intestinal ICC and c-Kit positive cells. Neurotensin-induced tonic inward pacemaker currents were blocked by external Na⁺-free solution and in the presence of flufenamic acid, an inhibitor of non-selective cation channels. Furthermore, neurotensin-induced action is blocked either by treatment with U73122, a phospholipase C inhibitor, or thapsigargin, a Ca²⁺-ATPase inhibitor in ICC. We found that neurotensin increased spontaneous intracellular Ca²⁺ oscillations as seen with fluo4/AM recording. These results suggest that neurotensin modulates pacemaker currents via the activation of non-selective cation channels by intracellular Ca²⁺-release through neurotensin receptor1.
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Affiliation(s)
| | | | | | | | | | - Dong Chuan Zuo
- Department of Physiology, College of Medicine, Chosun University, Gwangju 501-759,
Korea
| | - Pawan Kumar Shahi
- Department of Physiology, College of Medicine, Chosun University, Gwangju 501-759,
Korea
| | - Seok Choi
- Department of Physiology, College of Medicine, Chosun University, Gwangju 501-759,
Korea
| | - Cheol Ho Yeum
- Department of Physiology, College of Medicine, Chosun University, Gwangju 501-759,
Korea
| | - Jae Yeoul Jun
- Department of Physiology, College of Medicine, Chosun University, Gwangju 501-759,
Korea
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Yoon PJ, Parajuli SP, Zuo DC, Shahi PK, Oh HJ, Shin HR, Lee MJ, Yeum CH, Choi S, Jun JY. Interplay of hydrogen sulfide and nitric oxide on the pacemaker activity of interstitial cells of cajal from mouse small intestine. Chonnam Med J 2011; 47:72-9. [PMID: 22111064 PMCID: PMC3214878 DOI: 10.4068/cmj.2011.47.2.72] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Accepted: 08/11/2011] [Indexed: 01/17/2023] Open
Abstract
We studied whether nitric oxide (NO) and hydrogen sulfide (H(2)S) have an interaction on the pacemaker activities of interstitial cells of Cajal (ICC) from the mouse small intestine. The actions of NO and H(2)S on pacemaker activities were investigated by using the whole-cell patch-clamp technique and intracellular Ca(2+) analysis at 30℃ in cultured mouse ICC. Exogenously applied (±)-S-nitroso-N-acetylpenicillamine (SNAP), an NO donor, or sodium hydrogen sulfide (NaHS), a donor of H(2)S, showed no influence on pacemaker activity (potentials and currents) in ICC at low concentrations (10 µM SNAP and 100 µM NaHS), but SNAP or NaHS completely inhibited pacemaker amplitude and pacemaker frequency with increases in the resting currents in the outward direction at high concentrations (SNAP 100 µM and NaHS 1 mM). Co-treatment with 10 µM SNAP plus 100 µM NaHS also inhibited pacemaker amplitude and pacemaker frequency with increases in the resting currents in the outward direction. ODQ, a guanylate cyclase inhibitor, or glibenclamide, an ATP-sensitive K(+) channel inhibitor, blocked the SNAP+NaHS-induced inhibition of pacemaker currents in ICC. Also, we found that SNAP+NaHS inhibited the spontaneous intracellular Ca(2+) ([Ca(2+)](i)) oscillations in cultured ICC. In conclusion, this study describes the enhanced inhibitory effects of NO plus H(2)S on ICC in the mouse small intestine. NO+H(2)S inhibited the pacemaker activity of ICC by modulating intracellular Ca(2+). These results may be evidence of a physiological interaction of NO and H(2)S in ICC for modulating gastrointestinal motility.
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Affiliation(s)
- Pyung Jin Yoon
- Department of Physiology, College of Medicine, Chosun University, Gwangju, Korea
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Shahi PK, Choi S, Zuo DC, Yeum CH, Yoon PJ, Lee J, Kim YD, Park CG, Kim MY, Shin HR, Oh HJ, Jun JY. 5-hydroxytryptamine generates tonic inward currents on pacemaker activity of interstitial cells of cajal from mouse small intestine. Korean J Physiol Pharmacol 2011; 15:129-35. [PMID: 21860590 DOI: 10.4196/kjpp.2011.15.3.129] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2011] [Revised: 06/13/2011] [Accepted: 06/14/2011] [Indexed: 12/22/2022]
Abstract
In this study we determined whether or not 5-hydroxytryptamine (5-HT) has an effect on the pacemaker activities of interstitial cells of Cajal (ICC) from the mouse small intestine. The actions of 5-HT on pacemaker activities were investigated using a whole-cell patch-clamp technique, intracellular Ca(2+) ([Ca(2+)](i)) analysis, and RT-PCR in ICC. Exogenously-treated 5-HT showed tonic inward currents on pacemaker currents in ICC under the voltage-clamp mode in a dose-dependent manner. Based on RT-PCR results, we found the existence of 5-HT(2B, 3, 4, and 7) receptors in ICC. However, SDZ 205557 (a 5-HT(4) receptor antagonist), SB 269970 (a 5-HT7 receptor antagonist), 3-tropanylindole - 3 - carboxylate methiodide (3-TCM; a 5-HT(3) antagonist) blocked the 5-HT-induced action on pacemaker activity, but not SB 204741 (a 5-HT(2B) receptor antagonist). Based on [Ca(2+)](i) analysis, we found that 5-HT increased the intensity of [Ca(2+)](i). The treatment of PD 98059 or JNK II inhibitor blocked the 5-HT-induced action on pacemaker activity of ICC, but not SB 203580. In summary, these results suggest that 5-HT can modulate pacemaker activity through 5-HT(3, 4, and 7) receptors via [Ca(2+)](i) mobilization and regulation of mitogen-activated protein kinases.
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Affiliation(s)
- Pawan Kumar Shahi
- Department of Physiology, College of Medicine, Chosun University, Gwangju 501-759, Korea
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Choi S, Sun JM, Shahi PK, Zuo DC, Kim HI, Jun JY. Capsaicin inhibits the spontaneous pacemaker activity in interstitial cells of cajal from the small intestine of mouse. J Neurogastroenterol Motil 2010; 16:265-73. [PMID: 20680165 PMCID: PMC2912119 DOI: 10.5056/jnm.2010.16.3.265] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2010] [Revised: 04/22/2010] [Accepted: 04/28/2010] [Indexed: 11/25/2022] Open
Abstract
Background/Aims Capsaicin (8-methyl-N-vanillyl-6-ninenamide), a compound found in hot peppers, has been reported to have different physiological actions on different cell types. Not much work has been done about the effect of capsaicin on the function of interstitial cells of Cajal (ICC). In the present study, we examined the action of external application of capsaicin on pacemaker activity in the cultured ICC from the small intestine of mouse. Methods We investigated the effect of capsaicin on pacemaker currents in cultured ICC from the small intestine of mouse using a whole cell patch-clamp technique and Ca2+-imaging analysis. Results When capsaicin was applied externally to the pacemaker generating ICC, it completely inhibited the pacemaker potential under current-clamp mode (I = 0) and the pacemaker current under voltage-clamp mode at a -70 mV of holding potentials. The effect of capsaicin on pacemaker activity in ICC was shown dose dependently. The effect of capsaicin was not through the transient receptor potential of the vanilloid type 1 (TRPV1) channel as capsazepine did not block the effect of capsaicin. L-NAME, an inhibitor of nitric oxide synthase, also did not block the capsaicin-induced effects. When the action of capsaicin was examined in the intracellular calcium oscillation, it completely abolished the calcium oscillation. Conclusions These results prove that the capsaicin has the inhibitory effects on the ICC which is carried out neither through TRPV channel nor the nitric oxide production. Intracellular Ca2+ was also an important target for actions of capsaicin on ICC.
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Affiliation(s)
- Seok Choi
- Department of Physiology, College of Medicine, Chosun University, Gwangju, Korea
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Kim KY, Choi SJ, Jang HJ, Zuo DC, Shahi PK, Parajuli SP, Yeum CH, Yoon PJ, Choi S, Jun JY. (-)-epigallocatechin gallate inhibits the pacemaker activity of interstitial cells of cajal of mouse small intestine. Korean J Physiol Pharmacol 2008; 12:111-5. [PMID: 20157403 DOI: 10.4196/kjpp.2008.12.3.111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The effects of (-)-epigallocatechin gallate (EGCG) on pacemaker activities of cultured interstitial cells of Cajal (ICC) from murine small intestine were investigated using whole-cell patch-clamp technique at 30 and Ca(2+) image analysis. ICC generated spontaneous pacemaker currents at a holding potential of -70 mV. The treatment of ICC with EGCG resulted in a dose-dependent decrease in the frequency and amplitude of pacemaker currents. SQ-22536, an adenylate cyclase inhibitor, and ODQ, a guanylate cyclase inhibitor, did not inhibit the effects of EGCG. EGCG-induced effects on pacemaker currents were not inhibited by glibenclamide, an ATP-sensitive K(+) channel blocker and TEA, a Ca(2+)-activated K(+) channel blocker. Also, we found that EGCG inhibited the spontaneous [Ca(2+)](i) oscillations in cultured ICC. In conclusion, EGCG inhibited the pacemaker activity of ICC and reduced [Ca(2+)](i) oscillations by cAMP-, cGMP-, ATP-sensitive K+ channel-independent manner.
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Affiliation(s)
- Kweon Young Kim
- Department of Rehabilitation, College of Medicine, Chosun University, Gwangju 501-759, Korea
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