Hepatic TRPC3 loss contributes to chronic alcohol consumption-induced hepatic steatosis and liver injury in mice

Abstract

Emerging evidence discloses the involvement of calcium channel protein in the pathological process of liver diseases. Transient receptor potential cation channel subfamily C member 3 (TRPC3), a ubiquitously expressed non-selective cation channel protein, controls proliferation, inflammation, and immune response via operating calcium influx in various organs. However, our understanding on the biofunction of hepatic TRPC3 is still limited. The present study aims to clarify the role and potential mechanism(s) of TRPC3 in alcohol-associated liver disease (ALD). We recently found that TRPC3 expression plays an important role in the disease process of ALD. Alcohol exposure led to a significant reduction of hepatic TRPC3 in patients with alcohol-related hepatitis (AH) and ALD models. Antioxidants (N-acetylcysteine and mitoquinone) intervention improved alcohol-induced suppression of TRPC3 via a miR-339-5p-involved mechanism. TRPC3 loss robustly aggravated the alcohol-induced hepatic steatosis and liver injury in mouse liver; this was associated with the suppression of Ca²⁺/calmodulin-dependent protein kinase kinase 2 (CAMKK2)/AMP-activated protein kinase (AMPK) and dysregulation of genes related to lipid metabolism. TRPC3 loss also enhanced hepatic inflammation and early fibrosis-like change in mice. Replenishing hepatic TRPC3 effectively reversed chronic alcohol-induced detrimental alterations in ALD mice. Briefly, chronic alcohol exposure-induced TRPC3 reduction contributes to the pathological development of ALD via suppression of the CAMKK2/AMPK pathway. Oxidative stress-stimulated miR-339-5p upregulation contributes to alcohol-reduced TRPC3. TRPC3 is the requisite and a potential target to defend alcohol consumption-caused ALD.

Keywords

TRPC3 / alcohol-associated liver disease / miR-339-5p / hepatic steatosis / liver injury / CAMKK2/AMPK

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