title: [Identification of Env-specific monoclonal antibodies from Chinese HIV-1 infected person by B cell activation and RT-PCR cloning].
abstract: To obtain protective human monoclonal antibody from HIV-1 infected person, we adapted a technology for isolating antigen specific monoclonal antibody from human memory B cells through in vitro B cell activation coupled with RT-PCT and expression cloning. Human B cells were purified by negative sorting from PBMCs of HIV-1 infected individuals and memory B cells were further enriched using anti-CD27 microbeads. Two hundred memory B cells per well were cultured in 96-well round-bottom plates Env-specific antibodies in supernatants were with feeder cells in medium containing EBV and CpG. screened by ELISA after 1-2 weeks' culture. Cells from positive wells of Env-specific antibody were harvested and total RNA was isolated. Human VH and Vkappa or Vlambda genes were amplified by RT-PCR and cloned into IgG1 and kappa or lambda expressing vectors. Functional VH and Vkappa or Vlambda were identified by cotransfecting 293T cells with individual heavy chain and light chain clones followed by analysis of culture supernatants by ELISA for Env-specific antibodies. Finally, corresponding mAb was produced by transient transfection of 293T cells with the identified VH and Vkappa/lambda pair and purified by protein A affinity chromatography. Purified monocolonal antibodies were used for HIV-1 specific antibody-dependent cell-mediated cytotoxicity (ADCC) and neutralizing activity assay. Four monocolonal Env-specific antibodies were isolated from one HIV-1 subtype B' infected individual. Two of them showed strong ADCC activity and one showed weak neutralizing activity against HIV-1. Its further studies on their application in therapeutic or prophylactic vaccines against HIV-1 should be grounded.
authors.affiliation: State Key Laboratory for Infectious Disease Prevention and Control, National Institute for Viral Disease Control and Prevention, China CDC, Beijing 100052, China. whm.anqing2007@163.com
authors.forename: Hui-Min
authors.initials: HM
authors.lastname: Wang
authors.forename: Ke
authors.initials: K
authors.lastname: Xu
authors.forename: Shuang-Qing
authors.initials: SQ
authors.lastname: Yu
authors.forename: Lin-Lin
authors.initials: LL
authors.lastname: Ding
authors.forename: Hai-Yan
authors.initials: HY
authors.lastname: Luo
authors.forename: Robin
authors.initials: R
authors.lastname: Flinko
authors.forename: George K
authors.initials: GK
authors.lastname: Lewis
authors.forename: Xia
authors.initials: X
authors.lastname: Feng
authors.forename: Ji-Rong
authors.initials: JR
authors.lastname: Shao
authors.forename: Yong-Jun
authors.initials: YJ
authors.lastname: Guan
authors.forename: Yi
authors.initials: Y
authors.lastname: Zeng
mesh_terms: D000911:Antibodies, Monoclonal / Q000235:genetics / Q000276:immunology*; D000918:Antibody Specificity; D044466:Asian People; D001402:B-Lymphocytes / Q000276:immunology*; D003001:Cloning, Molecular; D057809:HEK293 Cells; D015658:HIV Infections / Q000097:blood / Q000276:immunology*; D015497:HIV-1 / Q000276:immunology* / Q000472:pathogenicity; D006801:Humans; D056724:Immunity, Humoral; D009500:Neutralization Tests; D016133:Polymerase Chain Reaction; D054299:env Gene Products, Human Immunodeficiency Virus / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D054299:env Gene Products, Human Immunodeficiency Virus