期刊
WORLD JOURNAL OF GASTROENTEROLOGY
卷 19, 期 8, 页码 1210-1218出版社
BAISHIDENG PUBL GRP CO LTD
DOI: 10.3748/wjg.v19.i8.1210
关键词
Interstitial cells of Cajal; Lipopolysaccharide; Mitogen-activated protein kinases; Nuclear factor kappa B;; Small intestine
资金
- National Research Foundation of Korea
- Ministry of Education, Science and Technology [2012-0001335]
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-Larginine 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 kappa B (NF-kappa B) 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-kappa B are implicated in these actions. (C) 2013 Baishideng. All rights reserved.
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