The innate immune receptor TREM-1 promotes liver injury and fibrosis

Anh Thu Nguyen, Ashwin Ajith, Vera Portik-Dobos, Daniel David Horuzsko, Ali Syed Arbab, Amiran Dzutsev, Ramses F Sadek, Giorgio Trinchieri, Anatolij Horuzsko

Research output: Contribution to journalArticle

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Abstract

Inflammation occurs in all tissues in response to injury or stress and is the key process underlying hepatic fibrogenesis. Targeting chronic and uncontrolled inflammation is one strategy to prevent liver injury and fibrosis progression. Here, we demonstrate that triggering receptor expressed on myeloid cells 1 (TREM-1), an amplifier of inflammation, promotes liver disease by intensifying hepatic inflammation and fibrosis. In the liver, TREM-1 expression was limited to liver macrophages and monocytes and was highly upregulated on Kupffer cells, circulating monocytes, and monocyte-derived macrophages in a mouse model of chronic liver injury and fibrosis induced by carbon tetrachloride (CCl4) administration. TREM-1 signaling promoted proinflammatory cytokine production and mobilization of inflammatory cells to the site of injury. Deletion of Trem1 reduced liver injury, inflammatory cell infiltration, and fibrogenesis. Reconstitution of Trem1-deficient mice with Trem1-sufficient Kupffer cells restored the recruitment of inflammatory monocytes and the severity of liver injury. Markedly increased infiltration of liver fibrotic areas with TREM-1-positive Kupffer cells and monocytes/macrophages was found in patients with hepatic fibrosis. Our data support a role of TREM-1 in liver injury and hepatic fibrogenesis and suggest that TREM-1 is a master regulator of Kupffer cell activation, which escalates chronic liver inflammatory responses, activates hepatic stellate cells, and reveals a mechanism of promotion of liver fibrosis.

Original languageEnglish (US)
Pages (from-to)4870-4883
Number of pages14
JournalJournal of Clinical Investigation
Volume128
Issue number11
DOIs
StatePublished - Nov 1 2018

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Myeloid Cells
Liver Cirrhosis
Liver
Wounds and Injuries
Kupffer Cells
Monocytes
Inflammation
Macrophages
Fibrosis
Hepatic Stellate Cells
Carbon Tetrachloride
Liver Diseases
Cytokines

ASJC Scopus subject areas

  • Medicine(all)

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The innate immune receptor TREM-1 promotes liver injury and fibrosis. / Nguyen, Anh Thu; Ajith, Ashwin; Portik-Dobos, Vera; Horuzsko, Daniel David; Arbab, Ali Syed; Dzutsev, Amiran; Sadek, Ramses F; Trinchieri, Giorgio; Horuzsko, Anatolij.

In: Journal of Clinical Investigation, Vol. 128, No. 11, 01.11.2018, p. 4870-4883.

Research output: Contribution to journalArticle

Nguyen, Anh Thu ; Ajith, Ashwin ; Portik-Dobos, Vera ; Horuzsko, Daniel David ; Arbab, Ali Syed ; Dzutsev, Amiran ; Sadek, Ramses F ; Trinchieri, Giorgio ; Horuzsko, Anatolij. / The innate immune receptor TREM-1 promotes liver injury and fibrosis. In: Journal of Clinical Investigation. 2018 ; Vol. 128, No. 11. pp. 4870-4883.
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