title: [Molecular adjuvant C3d up-regulates both B7-1 and B7-2 expression on Raji cells].
abstract: To explore modulation of the molecular adjuvant C3d in the hCGbeta -C3d3 fusion protein in costimulatory molecule expression on Raji cells by linking to the surface molecule CD21. Raji cells, B cell line, were incubated with the purified hCGbeta-C3d3, hCGbeta or C3d3 protein for 15 hours respectively in the interference of anti-CD21 monoclonal antibody or not. The culture concentration of each group was 10, 30, or 90 microg/ml respectively. The expression of both B7-1 and B7-2 on Raji cells were analyzed by flow cytometric assay. It was observed that compared to hCGbeta or C3d3 protein, hCGbeta-C3d3 up-regulated both B7-1 and B7-2 expression on the Raji cells, and the effect was in a dose-dependent manner. The up-regulation effect was blocked efficiently by anti-CD21 mAb. The results showed that molecular adjuvant C3d may up-regulate both B7-1 and B7-2 expression on Raji cell via C3d/CD21/CD19 complex, thus enhance the antigen presentation of B cell, and the interaction between B cell and T cell.
authors.affiliation: Laboratory of Reproductive Immunology, Institute of Obstetrics and Gynecology, Fudan University, Shanghai 200011.
authors.forename: Min
authors.initials: M
authors.lastname: Yu
authors.forename: Da Jin
authors.initials: DJ
authors.lastname: Li
authors.forename: Xiu Li
authors.initials: XL
authors.lastname: Wang
authors.forename: Min Min
authors.initials: MM
authors.lastname: Yuan
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhu
authors.forename: Xiao Ying
authors.initials: XY
authors.lastname: Yao
authors.forename: Hua Ping
authors.initials: HP
authors.lastname: Li
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D018122:B7-1 Antigen / Q000235:genetics / Q000378:metabolism*; D051940:B7-2 Antigen / Q000235:genetics / Q000378:metabolism*; D016466:CHO Cells; D045744:Cell Line, Tumor; D018997:Chorionic Gonadotropin, beta Subunit, Human / Q000235:genetics / Q000378:metabolism; D015933:Complement C3d / Q000235:genetics / Q000378:metabolism* / Q000494:pharmacology; D006224:Cricetinae; D003412:Cricetulus; D004305:Dose-Response Relationship, Drug; D004591:Electrophoresis, Polyacrylamide Gel; D005434:Flow Cytometry; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D017464:Receptors, Complement 3d / Q000276:immunology; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology; D015854:Up-Regulation / Q000187:drug effects
chemical_list: D000911:Antibodies, Monoclonal; D018122:B7-1 Antigen; D051940:B7-2 Antigen; D018997:Chorionic Gonadotropin, beta Subunit, Human; D017464:Receptors, Complement 3d; D011993:Recombinant Fusion Proteins; D015933:Complement C3d