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• W1811963006 abstract "Background and Purpose As the pathogenesis of postoperative ileus (POI) involves inflammation and oxidative stress, comparable to ischaemia/reperfusion injury which can be ameliorated with nitrite, we investigated whether nitrite can protect against POI and explored the mechanisms involved. Experimental Approach We used intestinal manipulation (IM) of the small intestine to induce POI in C57BL/6J mice. Sodium nitrite (48 nmol) was administered intravenously just before IM. Intestinal transit was assessed using fluorescent imaging. Bethanechol‐stimulated jejunal circular muscle contractions were measured in organ baths. Inflammatory parameters, neutrophil infiltration, inducible NOS (iNOS) activity, reactive oxygen species (ROS) levels, mitochondrial complex I activity and cGMP were measured in the intestinal muscularis. Key Results Pre‐treatment with nitrite markedly improved the delay in intestinal transit and restored the reduced intestinal contractility observed 24 h following IM. This was accompanied by reduced protein levels of TNF‐α, IL‐6 and the chemokine CCL2, along with reduced iNOS activity and ROS levels. The associated neutrophil influx at 24 h was not influenced by nitrite. IM reduced mitochondrial complex I activity and cGMP levels; treatment with nitrite increased cGMP levels. Pre‐treatment with the NO scavenger carboxy‐PTIO or the soluble guanylyl cyclase inhibitor ODQ abolished nitrite‐induced protective effects. Conclusions and Implications Exogenous nitrite deserves further investigation as a possible treatment for POI. Nitrite‐induced protection of POI in mice was dependent on NO and this effect was not related to inhibition of mitochondrial complex I, but did involve activation of soluble guanylyl cyclase." @default.
• W1811963006 created "2016-06-24" @default.
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• W1811963006 date "2015-10-01" @default.
• W1811963006 modified "2023-09-27" @default.
• W1811963006 title "Protective effect of exogenous nitrite in postoperative ileus" @default.
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• W1811963006 doi "https://doi.org/10.1111/bph.13255" @default.
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