Short-term sensitization of colon mechanoreceptors is associated with long-term hypersensitivity to colon distention in the mouse.

Short-term sensitization of colon mechanoreceptors is associated with long-term hypersensitivity to colon distention in the mouse. Research Abstract Details 

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Short-term sensitization of colon mechanoreceptors is associated with long-term hypersensitivity to colon distention in the mouse. Abstract Text:

R Carter W Jones,Eiji Otsuka,Emily Wagstrom,Chris S Jensen,Margaret P Price,G F Gebhart,

BACKGROUND & AIMS: Using a mouse model that reproduces major features of irritable bowel syndrome (long-lasting colon hypersensitivity without inflammation), we examined the contributions of 2 proteins, transient receptor potential vanilloid 1 (TRPV1) and acid-sensing ion channel 3 (ASIC3), on development of behavioral hypersensitivity and assessed the function of colon mechanoreceptors of hypersensitive mice. METHODS: Visceral nociceptive behavior was measured as the visceromotor response (VMR) to colorectal distention (CRD) before and after intracolonic treatment with zymosan or saline. Colon pathology was assessed in parallel experiments by quantifying myeloperoxidase activity, intralumenal pH, and tissue histology. Electrophysiologic experiments were performed on naïve and zymosan-treated hypersensitive mice using an in vitro colon-pelvic nerve preparation. RESULTS: Zymosan, but not saline, produced significant and persistent increases in the VMRs of control mice; zymosan produced nonsignificant increases in the VMRs in TRPV1 and ASIC3 knockout mice. Colon myeloperoxidase activity and pH were unaffected by either CRD or intracolonic treatments. Pelvic nerve mechanoreceptors recorded from zymosan-treated or naïve mice had similar sensitivity to stretch of the colon. When applied acutely, zymosan sensitized muscular/mucosal mechanoreceptors in both naïve and hypersensitive mice. CONCLUSIONS: Zymosan produced sensitization of colon mechanoreceptors acutely in vitro and chronic (>or=7 weeks) behavioral hypersensitivity in the absence of inflammation. The behavioral hypersensitivity was partially dependent on both TRPV1 and ASIC3 because deletions of either of these genes blunted zymosan's effect, suggesting that these proteins may be important peripheral mediators for development of functional (ie, noninflammatory) visceral hypersensitivity.

Short-term sensitization of colon mechanoreceptors is associated with long-term hypersensitivity to colon distention in the mouse. Publishing Authors By Initials

RC Jones,E Otsuka,E Wagstrom,CS Jensen,MP Price,GF Gebhart,

For similar beta-glucans: zymosan research abstracts see: beta-glucans: zymosan research

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Short-term sensitization of colon mechanoreceptors is associated with long-term hypersensitivity to colon distention in the mouse. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Gastroenterology

VOLUME: 133

Page Numbers: 184-94

Journal Abbreviation: Gastroenterology

ISSN: 0016-5085

DAY: 25

MONTH: 04

YEAR: 2007

Short-term sensitization of colon mechanoreceptors is associated with long-term hypersensitivity to colon distention in the mouse. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 374630

Short-term sensitization of colon mechanoreceptors is associated with long-term hypersensitivity to colon distention in the mouse. Keywords Mesh Terms:

KEYWORDS: Zymosan

MESH TERMS: pharmacology

Chemical & Substance for Abstract: Short-term sensitization of colon mechanoreceptors is associated with long-term hypersensitivity to colon distention in the mouse. Information

Substance Name: Zymosan

Registry Number: 9010-72-4

Grant and Affiliation Information for Short-term sensitization of colon mechanoreceptors is associated with long-term hypersensitivity to colon distention in the mouse.

AFFILIATION: Medical Scientist Training Program, The University of Iowa, Iowa City, Iowa, USA.

Country: United States

AGENCY: United States NINDS

GRANT: R01-NS-19912

ACRONYM: NS

MEDLINETA: Gastroenterology

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