Adipocyte small extracellular vesicle-derived microRNA-30a-3p exacerbates hepatic steatosis in high fat diet-fed male mice.
basic_science · Level V
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- Record sourced from PubMed, PMID 41965824.
- Also identified by DOI 10.1038/s41467-026-71731-2.
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Abstract
Adipose tissue dysfunction drives hepatic lipid overload in metabolic dysfunction-associated steatotic liver disease (MASLD), yet the involvement of adipose tissue-derived small extracellular vesicles (sEVs) remains unclear. Herein, we showed that transplanting adipose tissue from high‑fat diet (HFD)-fed male mice exacerbated insulin resistance and hepatic steatosis in lean recipients. Adipose‑specific Sirt3 overexpression (Sirt3<sup>AKI</sup>) alleviated insulin resistance and liver steatosis in HFD-fed male mice, whereas adipose‑specific Sirt3 knockdown aggravated these phenotypes. Moreover, adipose sEV miRNAs regulated hepatic lipid metabolism in Sirt3<sup>AKI</sup> male mice. MicroRNA sequencing identified miR-30a-3p was increased in the circulating sEVs from HFD-fed male mice, while decreased in sEVs from Sirt3OE adipocytes and Sirt3<sup>AKI</sup> male mice. Mechanistically, miR‑30a‑3p promoted hepatic steatosis by targeting Becn1; this process was suppressed when Sirt3 downregulated miR‑30a‑3p transcription via deacetylation of H3K56. These findings highlight the critical role of adipose sEV microRNAs in driving hepatocyte lipotoxicity, and suggest miR-30a-3p inhibition as a promising MASLD therapy.