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It is thought that enteric neuropathy and dysmotility occur before overt diabetes, but triggers of these abnormalities are not fully known. We tested the hypothesis that intestinal contents of mice with and without high\u2010fat diet\u2010 (HFD\u2010) induced diabetic conditions contain molecules that impair gastrointestinal movements by damaging neurons and disrupting muscle contractions.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Small and large intestinal segments were collected from healthy, standard chow diet (SCD) fed mice. Filtrates of ileocecal contents (ileocecal supernatants; ICS) from HFD or SCD mice were perfused through them. Cultured intact intestinal muscularis externa preparations were used to determine whether ICS and their fractions obtained by solid\u2010phase extraction (SPE) and SPE subfractions collected by high\u2010performance liquid chromatography (HPLC) disrupt muscle contractions by injuring neurons and smooth muscle cells.<\/jats:p><\/jats:sec><jats:sec><jats:title>Key Results<\/jats:title><jats:p>ICS from HFD mice reduced intestinal motility, but those from SCD mice had no effect. ICS, aqueous SPE fractions and two out of twenty HPLC subfractions of aqueous SPE fractions from HFD mice blocked muscle contractions, caused a loss of nitrergic myenteric neurons through inflammation, and reduced smooth muscle excitability. Lipopolysaccharide and palmitate caused a loss of nitrergic myenteric neurons but did not affect muscle contractions.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions &amp; Inferences<\/jats:title><jats:p>Unknown molecules in intestinal contents of HFD mice trigger enteric neuropathy and dysmotility. Further studies are required to identify the toxic molecules and their mechanisms of action.<\/jats:p><\/jats:sec>","DOI":"10.1111\/nmo.13990","type":"journal-article","created":{"date-parts":[[2020,9,24]],"date-time":"2020-09-24T11:42:24Z","timestamp":1600947744000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Supernatants of intestinal luminal contents from mice fed high\u2010fat diet impair intestinal motility by injuring enteric neurons and smooth muscle cells"],"prefix":"10.1111","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7559-3803","authenticated-orcid":false,"given":"Yvonne","family":"Nyavor","sequence":"first","affiliation":[{"name":"Department of Biological Sciences University of Idaho  Moscow ID USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Catherine R.","family":"Brands","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences 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