Recombinant fibronectin polypeptide antagonizes hepatic failure induced by endotoxin in mice

• Published in: Acta pharmacologica Sinica Vol. 25; no. 6; pp. 783 - 788
• Main Authors: Wu, Yong, Chen, Yuan-Zhong, Huang, Hui-Fang, Chen, Ping
• Format: Journal Article
• Language: English
• Published: United States 01.06.2004
• Subjects: Animals; Apoptosis - drug effects; Cell Adhesion; Cells, Cultured; Cricetinae; Endotoxemia - chemically induced; Endotoxemia - pathology; Fibronectins - pharmacology; Galactosamine; Humans; Kidney - cytology; Lipopolysaccharides; Liver - pathology; Liver Failure - chemically induced; Liver Failure - pathology; Male; Mice; Mice, Inbred BALB C; Peptide Fragments - pharmacology; Recombinant Proteins - pharmacology; 乙酰半乳糖胺; 内毒素; 抵抗作用; 肝坏死; 诱导作用; 重组纤维结合蛋白多肽
• ISSN: 1671-4083; 1745-7254

AIM: To study the preventive effect of recombinant human fibronectin (rhFN) polypeptide on hepatic failure induced by endotoxin in mice. METHODS: A cDNA fragment coding for Ile1363-Tyr1725 of human FN was inserted into the PinPoint Xa-3 plasmid, and the constructed plasmid was transformed into E coli BL21 (DE3) cells,and then the expression of rhFN polypeptide in DE3 cells was identified through SDS-PAGE, The target protein from the supernatant of bacteria lysate was purified through biotin-affinity chromatography. The bioactivity of the purified rhFN polypeptide was determined with cell adhesive activity. The survival rate was observed in endotoxemia mice injected with rhFN polypeptide. The tissue damage in hepatocyte was detected using histology, ultrastructure,and DNA fragmentation assay. RESULTS: The expression of rhFN polypeptide reached approximately 20 % of the total cellular protein. The adhesion ability of rhFN polypeptide was concentration-dependent. The value of EC50 was 0.8 nmol/L. The survival rate of endotoxemia mice sensitized by D-galactosamine (D-GaIN) was 60 % in rhFN polypeptide treated group, while that of endotoxemia mice sensitized by D-GaIN was 20 % in the control group (P<0.01). Histopathology showed that less necrosis occurred on the hepatocyte of endotoxemia mice injected with rhFN polypeptide compared with saline control. Ultrastructure and DNA fragmentation assay showed that no apoptotic hepatocyte was observed in the liver of rhFN-treated endotoxemia mice. CONCLUSION: Recombinant fibronectin polypeptide antagonizes hepatic failure induced by endotoxin in mice.