Background <p>Liver fibrosis is a chronic progressive liver disease influenced by environmental and genetic factors. Early stages of liver fibrosis are marked by abnormal fat deposition in the liver. MicroRNA-30c (miR-30c) plays key roles in various pathological processes, including lipid metabolism, metabolic disorders, and cancer. However, the precise role of miR-30c in the progression of liver fibrosis remains unclear. This study aimed to investigate the role of miR-30c in liver fibrosis using miR-30c knockout (KO) mice.</p> Methods <p>KO mice were compared to wild-type (WT) mice to evaluate growth and development, with a focus on lipid metabolism markers. Liver transcriptomic analysis was performed to explore gene expression alterations due to miR-30c knockout. To induce liver fibrosis, thioacetamide (TAA) was administered to the mice, allowing the assessment of the impact of miR-30c on fibrosis initiation and progression.</p> Results <p>The results showed that miR-30c knockout led to body weight loss and disrupted lipid metabolism in mice. A total of 212 upregulated genes and 267 downregulated genes were identified in the livers of KO mice by RNA-seq.&#xa0;Differential enrichment of lipid metabolism pathways was observed KO mice, including PPAR signaling pathway, fatty acid degradation, biosynthesis of unsaturated fatty acids, and so on. The deletion of miR-30c aggravated the liver injury induced by TAA and increased the structural disorder of hepatocytes, and miR-30c knockout mice showed more severe liver fibrosis. This study establishes miR-30c as protective against liver fibrosis progression.</p> Conclusion <p>The deficiency of miR-30c might exacerbate fibrosis and inflammation, while also disrupting lipid metabolism, suggesting that miR-30c modulation shows therapeutic potential based on mechanistic evidence. Further exploration of miR-30c-mediated crosstalk between metabolic and inflammatory pathways could advance therapeutic strategies for fibrotic liver diseases.</p>