Single‐cell RNA sequencing reveals reduced intercellular adhesion molecule crosstalk between activated hepatic stellate cells and neutrophils alleviating liver fibrosis in hepatitis B virus transgenic mice post menstrual blood‐derived mesenchymal stem cell transplantation

Abstract Liver fibrosis can cause hepatitis B virus (HBV)‐associated hepatocellular carcinoma. Menstrual blood‐derived mesenchymal stem cells (MenSCs) can ameliorate liver fibrosis through paracrine. Single‐cell RNA sequencing (scRNA‐seq) may be used to explore the roadmap of activated hepatic stellate cell (aHSC) inactivation to target liver fibrosis. This study established HBV transgenic (HBV‐Tg) mouse model of carbon tetrachloride (CCl 4 )‐induced liver fibrosis and demonstrated that MenSCs migrated to the injured liver to improve serological indices and reduce fibrotic accumulation. RNA‐bulk analysis revealed that MenSCs mediated extracellular matrix accumulation and cell adhesion. Liver parenchymal cells and nonparenchymal cells were identified by scRNA‐seq in the control, CCl 4 , and MenSC groups, revealing the heterogeneity of fibroblasts/HSCs. A CellChat analysis revealed that diminished intercellular adhesion molecule (ICAM) signaling is vital for MenSC therapy. Specifically, Icam1 in aHSCs acted on Itgal / Itgb2 and Itgam / Itgb2 in neutrophils, causing decreased adhesion. The expression of Itgal , Itgam , and Itgb2 was higher in CCl 4 group than in the control group and decreased after MenSC therapy in neutrophil clusters. The Lcn2 , Pglyrp1 , Wfdc21 , and Mmp8 had high expression and may be potential targets in neutrophils. This study highlights interacting cells, corresponding molecules, and underlying targets for MenSCs in treating HBV‐associated liver fibrosis.