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Acute alcohol feeding can activate autophagy and promotes the selection of autophagic vacuoles in the mitochondria, which is a key process regulating the occurrence and progression of alcohol steatohepatitis (ASH). In this study, ASH mice expressed more autophagy-associated proteins than healthy controls, as revealed by immunohistochemistry. In addition, transmission electron microscopy (TEM) detected a unique autophagy ultrastructure in ASH mouse liver cells, consisting of a large vesicle fused directly with mitochondria, which differed from the classical pattern. This novel type of mitophagy may provide a new avenue for a protective mechanism targeting mitophagy, which would benefit patients with ASH. Abbreviations:  ASH: alcoholic steatohepatitis; ALD: Alcoholic liver disease; ALT: alanine aminotransferase; AST: aspartate aminotransferase; HE: hematoxylin and eosin; TEM: transmission electron microscope; LC3: microtubule-associated protein 1 light chain 3; SQSTM1/p62: sequestosome 1; UQCRC2: ubiquinol-cytochrome c reductase core protein 2; PINK1: PTEN induced kinase 1; AMPK: AMP-activated protein kinase

The mitophagosome, a novel ultrastructure of mitophagy in the alcoholic steatohepatitis mouse model: a transmission electron microscope study