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- W2807008957 abstract "Abstract Toll-like receptors (TLRs) are expressed in enteric neurons, glia, gastrointestinal (GI) smooth muscle and mucosa, yet their functional roles in the GI tract are not fully understood. TLRs have been linked to many of the undesirable central effects of chronic opioid administration including hyperalgesia and dependence via activation of central microglia. Opioid-induced bowel dysfunction (OIBD) remains a primary reason for the reduction or withdrawal of opioid analgesics. Morphine-induced inhibition of colonic motility was assessed in vivo by GI transit studies and in vitro using isolated colons from wildtype (WT) and TLR deficient mice. Morphine slowed movement of ingested content in WT but this retardation effect was attenuated in TLR4 −/− and TLR2/4 −/− . In isolated colons, morphine reduced amplitude and frequency colonic migrating motor contractions in both WT and TLR2/4 −/− . Electrical field stimulation elicited distal colon relaxation that was potentiated by morphine in WT but not in TLR2/4 −/− . Inhibitory junction potentials were of similar amplitude and kinetics in WT and TLR2/4 −/− distal colon and not altered by morphine. Enteric nerve density and proportion of nitrergic nerves were similar in WT and TLR2/4 −/− distal colon. These data suggest an involvement of TLRs in opioid pharmacodynamics and thus a potential interventional target for OIBD." @default.
- W2807008957 created "2018-06-13" @default.
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- W2807008957 date "2018-04-12" @default.
- W2807008957 modified "2023-10-16" @default.
- W2807008957 title "Differential effect of morphine on gastrointestinal transit, colonic contractions and nerve-evoked relaxations in Toll-Like Receptor deficient mice" @default.
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- W2807008957 doi "https://doi.org/10.1038/s41598-018-23717-4" @default.
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