PMID- 22800960 OWN - NLM STAT- MEDLINE DCOM- 20130117 LR - 20181201 IS - 1873-1686 (Electronic) IS - 0167-0115 (Linking) VI - 178 IP - 1-3 DP - 2012 Oct 10 TI - Brain-derived neurotrophic factor enhances the contraction of intestinal muscle strips induced by SP and CGRP in mice. PG - 86-94 LID - 10.1016/j.regpep.2012.07.001 [doi] AB - BACKGROUND AND AIMS: Brain-derived neurotrophic factor (BDNF) has been found in the intestinal tract of a variety of species. Its effects on visceral hyperalgesia have been examined to some degree, but limited studies have focused on gut motility. The aim of the present study was to investigate the effects of BDNF on gut motility of mice. METHODS: Longitudinal muscle (LM) strips were prepared from mice ileum and distal colon. The motility of gut was evaluated by the contraction of LM strips, which was recorded by a polyphisograph in vitro. Firstly, the roles of substance P (SP), calcitonin gene-related peptide (CGRP), and acetylcholine (ACh) on the contraction of LM strips were clarified. Then the exogenous BDNF was administered, and the alterations of SP/CGRP/ACh-induced contractions of the muscle strips were explored. Finally, heterozygous BDNF(+/-) mice and antibody of TrkB were introduced to investigate the role of endogenous BDNF on the SP/CGRP/ACh-induced gut motility. KEY RESULTS: SP (10(-8)-10(-6) mol L(-1)), CGRP (10(-8)-10(-7) mol L(-1)) and ACh (10(-8)-10(-6) mol L(-1)) dose-dependently caused the contraction of LM strips from ileum and distal colon, while the excitatory effect of CGRP was preceded by a transient inhibition. But 10(-6) mol L(-1) CGRP inhibited the contraction of LM strips. Pretreatment with exogenous BDNF (10(-8) mol L(-1)) remarkably enhanced the contraction of LM strips induced by SP (10(-9)-10(-7) mol L(-1)) and CGRP (10(-8)-10(-9) mol L(-1)). However, exogenous BDNF couldn't affect the contraction induced by ACh (10(-9)-10(-7) mol L(-1)). The excitatory effects of SP (10(-8)-10(-6) mol L(-1)) and CGRP (10(-8)-10(-7) mol L(-1)) on the contractions of LM strips from ileum and distal colon were significantly attenuated in BDNF(+/-) mice compared with those in BDNF(+/+) mice, while no difference of the effects of ACh (10(-8)-10(-6) mol L(-1)) on LM strips was observed between BDNF(+/-) mice and BDNF(+/+) mice. The monoclonal antibody of TrkB (TrkB-Ab) dramatically attenuated the excitatory effects of SP and CGRP on the contractions of LM strips, without affecting the excitatory effects of ACh. CONCLUSIONS AND INFERENCES: These data clarified the excitatory effects of SP, ACh and bilateral effects of CGRP on gut motility of mice and confirmed an essential role of BDNF on accelerating gut motility by enhancing the excitatory effects of SP/CGRP. CI - Copyright (c) 2012 Elsevier B.V. All rights reserved. FAU - Chen, Fei-xue AU - Chen FX AD - Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan 250012, PR China. FAU - Yu, Yan-bo AU - Yu YB FAU - Yuan, Xue-min AU - Yuan XM FAU - Zuo, Xiu-li AU - Zuo XL FAU - Li, Yan-qing AU - Li YQ LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20120716 PL - Netherlands TA - Regul Pept JT - Regulatory peptides JID - 8100479 RN - 0 (Brain-Derived Neurotrophic Factor) RN - 33507-63-0 (Substance P) RN - EC 2.7.10.1 (Receptor, trkB) RN - JHB2QIZ69Z (Calcitonin Gene-Related Peptide) RN - N9YNS0M02X (Acetylcholine) SB - IM MH - Acetylcholine/pharmacology/physiology MH - Animals MH - Brain-Derived Neurotrophic Factor/metabolism/pharmacology/*physiology MH - Calcitonin Gene-Related Peptide/pharmacology/*physiology MH - Colon/drug effects/metabolism/*physiology MH - Gastrointestinal Motility MH - Ileum/drug effects/metabolism/*physiology MH - In Vitro Techniques MH - Male MH - Mice MH - Mice, Inbred C57BL MH - Mice, Transgenic MH - Muscle Contraction/*drug effects MH - Receptor, trkB/agonists/antagonists & inhibitors/metabolism MH - Substance P/pharmacology/*physiology EDAT- 2012/07/18 06:00 MHDA- 2013/01/18 06:00 CRDT- 2012/07/18 06:00 PHST- 2011/10/18 00:00 [received] PHST- 2012/06/08 00:00 [revised] PHST- 2012/07/06 00:00 [accepted] PHST- 2012/07/18 06:00 [entrez] PHST- 2012/07/18 06:00 [pubmed] PHST- 2013/01/18 06:00 [medline] AID - S0167-0115(12)00199-1 [pii] AID - 10.1016/j.regpep.2012.07.001 [doi] PST - ppublish SO - Regul Pept. 2012 Oct 10;178(1-3):86-94. doi: 10.1016/j.regpep.2012.07.001. Epub 2012 Jul 16.