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- W1550430599 abstract "Gastrointestinal motility disorders are of considerable clinical importance in humans and animals. Abnormalities of smooth muscle and the enteric nervous system have been described. We have identified and characterized a new mutant stock of rats that develops severe megacecum and colon with pseudo-obstruction, Familial Megacecum and Colon (FMC). The inheritance pattern of FMC was characterized by selective breeding. Gastrointestinal motility was evaluated radiographically. Complete pathologic evaluations, including ultrastructural examination and staining of colonic segments for acetylcholinesterase, peripherin, vasoactive intestinal peptide, substance P, nitric oxide synthase, and somatostatin, were performed. Spontaneous contractility and contractile force in isolated colonic muscle strips were examined. Familial megacecum and colon is inherited as an autosomal recessive trait. The markedly dilated cecum and proximal portion of the colon are followed by a short, funnel-shaped segment and distal portion of the colon with normal or slightly reduced lumen. Although clinical features and gross anatomic changes of the colon resemble those of Hirschsprung's disease in humans and animals, aganglionosis is not a feature of FMC. An increase in somatostatin staining was observed in dilated regions of bowel. The spontaneous contractile frequency and contractile force were diminished in the affected colon. Familial megacecum and colon is a new mutant, distinct from previously described hereditary and targeted mutant rodent models that develop megacecum and colon as a result of distal colonic dysfunction. The functional or morphologic defect(s) that result in colonic dysfunction in rats with FMC was not determined. The disease may result from an absence or overexpression of a single or group of neurotransmitters or their respective neurons, receptor abnormalities, or defects in the intestinal pacemaker system." @default.
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- W1550430599 date "1998-06-01" @default.
- W1550430599 modified "2023-09-23" @default.
- W1550430599 title "Familial megacecum and colon in the rat: a new model of gastrointestinal neuromuscular dysfunction." @default.
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