Objective To observe the efficacy of CTLA4Ig and CD40Ig gene local cotransfeetion on the survival of renal allografts. Methods The kidneys of guinea pig were transfected with PcDNA 3.1 + -CTLA4Ig and/or PcDNA 3. 1 + -CD40Ig gene by Lipo2000, and the transfected kidneys were transplanted to SD rats. The recipients were divided into group 1 (transfected with PcDNA 3. 1 + , mock group), group 2 (transfected with PcDNA 3. 1 + -CD40Ig, CINOIg group), group 3 (transfected with PcDNA3. 1+-CTLA4Ig, CTLA4Ig group) and group 4 (co-transfected...