PRODUCTION OF PHAGE-DISPLAYED ANTI-IDIOTYPIC ANTIBODY SINGLE CHAIN VARIABLE FRAGMENTS TO MG7 MONOCLONAL ANTIBODY DIRECTED AGAINST GASTRIC CARCINOMA  

作　　者：何凤田 聂勇战 陈宝军 乔太东 韩者艺 樊代明 

机构地区：[1]Department of Biochemistry and Molecular Biology, Third Military Medical University, Chongqing 400038 [2]Institute of Digestive Disease, Xijing Hospital, Fourth Military Medical University, Xi'an 710032

出　　处：《Chinese Medical Sciences Journal》2002年第4期215-219,共5页中国医学科学杂志（英文版）

基　　金：This work was supported by the National Natural Sciences Founda- tion of China(NSFC, No. 39800057, No. 30200338) ;the National "863" High-tech Project Foundation (No. 102-10-01 -06) ;National Distinguished Youth Program of NSFC(No. 39525020); This wor

摘　　要：Objective. To generate phage-displayed anti-idiotypic antibody single chain variable fragments (anti - Id ScFv) to MG7 monoclonal antibody (McAb) directed against gastric carcinoma so as to lay a foundation for developing anti-Id ScFv vaccine of the cancer.Methods. Balb/c mice were immunized i. p. with MG7 McAb conjugated with keyhole limpet hemocyanin (KLH), and mRNA was isolated from the spleens of the immunized mice. Heavy and light chain (VH and VL) genes of antibody were amplified separately and assembled into ScFv genes with a linker DNA by PCR. The ScFv genes were ligated into the phagemid vector pCANTAB5E and the ligated sample was transformed into competent E. coli TGI. The transformants were infected with M13K07 helper phage to yield recombinant phages displaying ScFv on the tips of M13 phage. After 4 rounds of panning with MG7, the MG7-positive clones were selected by ELISA from the enriched phages. The types of the anti-Id ScFv displayed on the selected phage clones were preliminarily identified by competition ELISA.Results. The VH, VL and ScFv DNAs were about 340 bp, 320 bp and 750 bp respectively. Twenty-four MG7-positive clones were selected from 60 enriched phage clones, among which 5 displayed β or γ type anti-Id ScFv.Conclusion. The anti-Id ScFv to MG7 McAb can be successfully selected by recombinant phage antibody technique, which paves a way for the study of prevention and cure of gastric carcinoma by using anti-Id ScFv.

关 键 词：gastric carcinoma anti-idiotypic antibody IMMUNOTHERAPY 

分 类 号：R735.2[医药卫生—肿瘤] R730.[医药卫生—临床医学]