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• W3048634157 abstract "Duchenne muscular dystrophy (DMD) is characterized by the lack of dystrophin in skeletal, cardiac, and smooth muscle. Slow colonic transit and constipation are common in DMD patients and animal models of DMD. However, the cause of this hypocontractility and the expression of contractile proteins in smooth muscle are unknown. The aim of the study was to investigate the expression of contractile proteins in the colonic smooth muscle and the function of the colon in control and mdx mice.Muscle contraction was measured in muscle strips and isolated muscle cells. Peristaltic activity was measured in ex vivo preparations by spatiotemporal mapping, and gastrointestinal (GI) transit in vivo was measured by the distribution of fluorescent marker along the intestine and colon. mRNA expression of contractile proteins smoothelin, caldesmon, calponin, and tropomyosin was measured by qRT-PCR.Expression of mRNA for contractile proteins was decreased in colonic smooth muscle of mdx mice compared with control. Contraction in response to acetylcholine and KCl was decreased in colonic muscle strips and in isolated muscle cells of mdx mice. Distension of ex vivo colons with Krebs buffer induced peristalsis in both control and mdx mice; however, significantly fewer full peristaltic waves were recorded in the colons of mdx mice. GI transit was also inhibited in mdx mice.The data indicate that the lack of dystrophin causes decrease in colonic smooth muscle contractility, peristalsis, and GI transit and provides the basis for analysis of mechanisms involved in smooth muscle dysfunction in DMD." @default.
• W3048634157 created "2020-08-18" @default.
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• W3048634157 date "2020-08-12" @default.
• W3048634157 modified "2023-10-14" @default.
• W3048634157 title "Decreased smooth muscle function, peristaltic activity, and gastrointestinal transit in dystrophic (<i>mdx</i>) mice" @default.
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• W3048634157 doi "https://doi.org/10.1111/nmo.13968" @default.
• W3048634157 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32789934" @default.
• W3048634157 hasPublicationYear "2020" @default.
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