Non-parenchymal TREM-2 protects the liver from immune-mediated hepatocellular damage.

Abstract:

OBJECTIVE:Liver injury impacts hepatic inflammation in part via Toll-like receptor (TLR) signalling. Triggering receptor expressed on myeloid cells 2 (TREM-2) modulates TLR4-mediated inflammation in bone marrow (BM)-derived macrophages but its function in liver injury is unknown. Here we hypothesised that the anti-inflammatory effects of TREM-2 on TLR signalling may limit hepatic injury. DESIGN:TREM-2 expression was analysed in livers of humans with various forms of liver injury compared with control individuals. Acute and chronic liver injury models were performed in wild type and Trem-2-/- mice. Primary liver cells from both genotypes of mice were isolated for in vitro experiments. RESULTS:TREM-2 was expressed on non-parenchymal hepatic cells and induced during liver injury in mice and man. Mice lacking TREM-2 exhibited heightened liver damage and inflammation during acute and repetitive carbon tetrachloride and acetaminophen (APAP) intoxication, the latter of which TREM-2 deficiency was remarkably associated with worsened survival. Liver damage in Trem-2-/- mice following chronic injury and APAP challenge was associated with elevated hepatic lipid peroxidation and macrophage content. BM transplantation experiments and cellular reactive oxygen species assays revealed effects of TREM-2 in the context of chronic injury depended on both immune and resident TREM-2 expression. Consistent with effects of TREM-2 on inflammation-associated injury, primary hepatic macrophages and hepatic stellate cells lacking TREM-2 exhibited augmented TLR4-driven proinflammatory responses. CONCLUSION:Our data indicate that by acting as a natural brake on inflammation during hepatocellular injury, TREM-2 is a critical regulator of diverse types of hepatotoxic injury.

journal_name

Gut

journal_title

Gut

authors

Perugorria MJ,Esparza-Baquer A,Oakley F,Labiano I,Korosec A,Jais A,Mann J,Tiniakos D,Santos-Laso A,Arbelaiz A,Gawish R,Sampedro A,Fontanellas A,Hijona E,Jimenez-Agüero R,Esterbauer H,Stoiber D,Bujanda L,Banales JM,K

doi

10.1136/gutjnl-2017-314107

subject

Has Abstract

pub_date

2019-03-01 00:00:00

pages

533-546

issue

3

eissn

0017-5749

issn

1468-3288

pii

gutjnl-2017-314107

journal_volume

68

pub_type

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