Effect of alcohol on the interleukin 6-mediated inflammatory response in a new mouse model of acute-on-chronic liver injury.

BACKGROUND AND AIMS: ACLF is usually associated with a precipitant in the setting of a chronically damaged liver. We aim to combine a mouse model with a pre-injured liver (Abcb4/Mdr2(-/-)) with a recently standardized ethanol feeding model to dissect alcohol-related inflammatory responses in this model. METHOD: Ten (n=64) and 15 (n=64) week old wild-type (WT) C57BL/6J and Abcb4(-/-) knock-out (KO) mice were either fed control (WT/Cont and KO/Cont groups) or liquid ethanol diet (5% v/v) followed by an ethanol binge (4mg/kg) (WT/EtOH and KO/EtOH groups). Hepatic mRNA levels of IL6, IFN-G, IL-1B, TGFB1, TNF-A, CCL2, HGF, CRP, RANTES, PNPLA3 and COL3A1 were evaluated using the 2(-DeltaDeltaCt) method. IL6 and HGF plasma levels were quantified by ELISA. RESULTS: Older mice in KO/EtOH group displayed higher IL6 expressions compared to KO/Cont, WT/EtOH and WT/Cont groups of the same age, whereas HGF did not differ. Significant over-expression of CCL2 also corresponded to the same group. Males in KO/EtOH group exhibited higher IL6 expression than females. Lipid droplets were observed in about 80% of mice challenged with ethanol. There was a profound downregulation in PNPLA3 and RANTES levels after ethanol exposure. Mean size of the LDs was inversely correlated with hepatic PNPLA3 levels. CONCLUSION: We propose a novel promising approach to model alcohol-related ACLI. Acute inflammatory IL6-driven response might help transition from a stable chronic state to a progressive liver damage in Abcb4(-/-) mice. Repression of PNPLA3 resulted in a notable expansion in size of lipid droplets, indicating lipid remodeling in this model.

Biochim Biophys Acta Mol Basis Dis. 2018 Nov 15;1865(2):298-307. doi: 10.1016/j.bbadis.2018.11.008.
Authors:
Ersin Karatayli, R. A. Hall, Susanne Weber, Steven Dooley, Frank Lammert
Date Published:
Journal:
Biochim Biophys Acta Mol Basis Dis