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American Journal of Physiology - Gastrointestinal and Liver Physiology 2008-Jan

Genetic variation in endocannabinoid metabolism, gastrointestinal motility, and sensation.

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Michael Camilleri
Paula Carlson
Sanna McKinzie
April Grudell
Irene Busciglio
Duane Burton
Kari Baxter
Michael Ryks
Alan R Zinsmeister

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Öz

Cannabinoid agonist inhibits gastrointestinal motility. The endocannabinoid, anandamide, is inactivated by fatty acid amide hydrolase (FAAH). A single nucleotide polymorphism in the human FAAH gene (C385A) reduces FAAH expression. Our aim was to evaluate associations between FAAH genotype variation and symptom phenotype, gastric emptying and volume, colonic transit, and rectal sensation in patients with functional gastrointestinal disorders (FGID). 482 FGID patients [Rome II positive, 159 constipation disorders, 184 diarrhea disorders (D-IBS), 86 mixed bowel function (M-IBS), 20 chronic abdominal pain (CAP), 33 functional dyspepsia], and 252 healthy volunteers (HV) underwent questionnaires and studies of phenotype and genotype from 2000 to 2007: 250 gastric emptying, 210 fasting and postprandial gastric volume, 152 colonic transit, and 123 rectal sensation. All had FAAH genotype [CC vs. polymorphic (CA/AA)] determined by TaqMan. FAAH genotype distribution of FGID patients and HV did not deviate from Hardy-Weinberg equilibrium. There was a significant association of FAAH genotype with FGID phenotype (overall chi(2), P = 0.011) and with specific individual phenotypes (P = 0.048). Thus FAAH CA/AA increases the odds (relative to HV) for D-IBS (P = 0.008), M-IBS (P = 0.012), and, possibly, CAP (P = 0.055). There was a significant association of FAAH CA/AA genotype with accelerated colonic transit in D-IBS (P = 0.037). There was no association of FAAH genotype with rectal sensation thresholds or ratings. The association of genetic variation in metabolism of endocannabinoids with symptom phenotype in D-IBS and M-IBS and with faster colonic transit in D-IBS supports the hypothesis that cannabinoid mechanisms may play a role in the control of colonic motility in humans and deserve further study.

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