TNF-α诱导肝干细胞凋亡及信号转导途径的改变

Influence of allogeneic bone marrow mesenchymal stem cell transplantation on serum levels of HMGB1 in mice with acute live failure

AIM: To explore the influence of allogeneic bone marrow mesenchymal stem cell (BMSC) transpantion on serum levels of high group box protein B1 (HMGB1) in an animal model of acute live failure (ALF).

METHODS: Balb/c mice were given D-galactosamine (D-GaIN) and lipopolysaccharide (LPS) to induce acute liver failure. BMSCs were cultured and purified. Ninety healthy Balb/c mice were randomly assigned to three groups: normal control group, ALF group, and BMSC treatment group. ALT/AST levels were tested 12, 24, and 48 h after treatment, and liver tissue pathological examination was performed after 48 h. The expression of HMGB1 in serum was detected by Western blot.

RESULTS: The survival rate was significantly higher in the BMSC treatment group than in the ALF group (83.3% vs 16.7%, P < 0.05). AST/ALT levels in the ALF group and BMSC treatment group rose significantly at 12 h, peaked at 24 h, and began to fall at 48 h. ALT/AST levels at 12, 24 and 48 h were significantly higher in the ALF group and BMSC treatment group than in the normal group (all P < 0.01), and in the ALF group than in the BMSC treatment group (all P < 0.01). The degeneration and necrosis in liver tissue were less obvious in the BMSC treatment group than in the ALF group. HMGB1 was almost not detectable in normal mouse serum. Serum levels of HMGB1 were significantly higher in the ALF group than in the BMSC treatment group (P < 0.01).

CONCLUSION: BMSC transplantation inhibits HMGB1 expression, reduces liver inflammation, and thereby lowers mortality in mice with ALF.