• Amani Cherif-Sayadi, Kaouther Hadj Ayed-Tka, Mohamed Amine Zaouali, Mohamed Bejaoui, Najet Hadj-Abdallah, Ahlem Bouhlel, and Ben AbdennebiHassenHa Research Unit of Biology and Molecular Anthropology Applied to Development and Health (UR12ES11), Faculty of Pharmacy , University of Monastir , Monastir , Tunisia..
• a Research Unit of Biology and Molecular Anthropology Applied to Development and Health (UR12ES11), Faculty of Pharmacy , University of Monastir , Monastir , Tunisia.
• Libyan J Med. 2017 Dec 1; 12 (1): 13087801308780.

IntroductionNitrite has been found to protect liver graft from cold preservation injury. However, the cell signaling pathway involved in this protection remains unclear. Here, we attempt to clarify if the NOS pathway by using the NOS inhibitor, L-NAME (L-NG-Nitroarginine methyl ester).Animals And MethodsRat livers were conserved for 24 h at 4°C in (IGL-1) solution enriched or not with nitrite at 50 nM. In a third group, rats were pretreated with 50 mg/kg of L-NAME before their liver procurement and preservation in IGL-1 supplemented with nitrite (50 nM) and L-NAME (1 mM). After 24 h of cold storage, rat livers were ex-vivo perfused at 37°C during 2 h. Control livers were perfused without cold storage.ResultsNitrite effectively protected the rat liver grafts from the onset of cold I/R injury. L-NAME treatment did not abolish the beneficial effects of nitrite. Liver damage, protein oxidation and lipid peroxidation remained at low levels in both nitrite-treated groups when compared to IGL-1 group. Antioxidant enzyme activities and functional parameters were unchanged after NOS inhibition.ConclusionDespite NOS inhibition by L-NAME, nitrite can still provide hepatic protection during cold I/R preservation. This suggests that nitrite acts through a NOS-independent pathway.

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