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- W2207545429 abstract "We have recently demonstrated that concanavalin A (Con A)-induced hepatitis is associated with the release of endogenous 1-methylnicotinamide (MNA). Here we study the mechanism by which exogenous MNA alleviates Con A-induced liver inflammation and injury in vivo. The involvement of prostacyclin (PGI2) in hepatoprotective action of MNA (30–100 mg kg− 1; i.v.) was studied by the use of IP receptor antagonist RO3244794 (10 mg kg− 1; p.o.) given prior to Con A (5–20 mg kg− 1; i.v.). Liver damage was assessed by measurements of: liver specific transaminases in plasma (alanine aminotransferase; aspartate aminotransferase); cytokines release (IL-4, IFN-γ and TNF-α); liver histopathology; and 24 h survival rates. Additionally, the effect of a stable analog of prostacyclin (carbaprostacyclin) on IL-4, IFN-γ and TNF-α production by isolated spleen lymphocytes in response to Con A was analyzed. MNA diminished Con A-induced rise in liver specific transaminases, alleviated histopathological injury and improved 24 h survival rates, the latter effect in a degree comparable with the pretreatment of animals with dexamethasone (0.5 mg kg− 1; i.p.). MNA inhibited also a rise in IL-4 and TNF-α concentration in plasma measured 2 h after Con A administration, while IFN-γ was less affected. The effects of MNA were reversed by pretreatment with IP antagonist RO3244794. In isolated spleen lymphocytes, carbaprostacyclin profoundly decreased production of IL-4, the effect on TNF-α was modest with no effect on IFN-γ production. In conclusion, MNA attenuated Con A-induced hepatitis by a prostacyclin-dependent mechanism involving the inhibition of lymphocytes-derived IL-4 and the inhibition of Kuppfer-cells derived TNF-α." @default.
- W2207545429 created "2016-06-24" @default.
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- W2207545429 date "2016-02-01" @default.
- W2207545429 modified "2023-10-12" @default.
- W2207545429 title "1-Methylnicotinamide protects against liver injury induced by concanavalin A via a prostacyclin-dependent mechanism: A possible involvement of IL-4 and TNF-α" @default.
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- W2207545429 doi "https://doi.org/10.1016/j.intimp.2015.11.032" @default.
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