Application of Cytotoxic T Lymphocyte Antigen 4 Immunoglobulin G in Prevention of Rejection and the Induction of Immune Tolerance of Orthotopic Liver Transplantation in Rats / 中国普外基础与临床杂志

ABSTRACT

Objective This study was conducted to build experimental model of orthotopic liver transplantation in rat(ROLT) with the character of acute rejection;and to study the effect of cytotoxic T lymphocyte antigen 4 immunoglobulin G(CTLA4-Ig) on prevention of rejection and the induction of immune tolerance of ROLT.(Methods Build model) of Wistar→SD ROLT(performed by the two cuff method) with character of acute rejection.Recipients were injected with CTLA4-Ig 75 ?g per ROLT into abdominal cavity after 2 days of operation.Contrast was made with no treatment group,the clinical characters,the liver function,the transplantated liver pathologic character and the concentrations of TNF-? in serum were observed and measured on postoperative day 7.In treatment group,all above observation were done on postoperative month 4.Above all,determination of the effect of CTLA4-Ig on preventing acute rejection and inducing tolerance in ROLT was observed.Results ①Recipients(no treatment group) died one by one within 6th～14th days;pathologic character of rejection in transplantation liver could be found;② In treatment group,on postoperative day 7 and month 4,no clinical rejection character and no pathologic character of rejection in transplantation liver were found and serum concentration of cytokins related to TNF-? found lower than that of contrast group(P