Deletion of ABIN1-LIR motifs impairs hepatic lipid homeostasis and mitophagy via AMPK-TFEB axis in mice.

Abstract

The A20 binding inhibitor of nuclear factor-kappa B (NF-κB)-1 (ABIN-1) serves as a ubiquitin sensor and autophagy receptor, crucial for modulating inflammation and cell death. Our previous in vitro investigation identified the LC3-interacting region (LIR) motifs 1 and 2 of ABIN-1 as key mitophagy regulators. This study aimed to explore the in vivo biological significance of ABIN1-LIR domains using a novel CRISPR-engineered ABIN1-ΔLIR1/2 mouse model, which lacks both LIR motifs. Comprehensive morphological, serum, and tissue histochemical analyses revealed increased body, fat, and liver weights, altered serum and hepatic lipid profiles, and substantial hepatic lipid droplet accumulation, indicative of altered hepatic lipid metabolism, dyslipidemia, and hepatic steatosis in ABIN1-ΔLIR1/2 mice. Transcriptomic, metabolomic, and lipidomic analyses indicated dysregulated hepatic mitochondrial metabolism, favoring lipogenesis. Mechanistically, LIR1/2 deletion inhibited the expression and activity of transcription factor EB (TFEB) and AMP-activated protein kinase β1 (AMPKβ1), resulting in compromised autophagy and lipophagy. ABIN1 interacted with TFEB and colocalization was observed in both the cytoplasmic and nuclear compartments of hepatocytes. Impaired mitophagy was evidenced by the decreased expression of parkin and optineurin, along with increased levels of mitochondrial cytochrome c oxidase subunit II. These findings were corroborated by liver biopsies of patients with metabolic dysfunction-associated steatotic liver disease. Thus, this study underscores the functional role of ABIN1-LIR motifs in modulating the ABIN1-AMPK-TFEB axis, which is critical for mitochondria-associated lipid metabolism and mitophagy, offering insights into the mechanistic pathways contributing to the pathogenesis of steatosis-associated liver diseases with potential therapeutic implications.