title: An immunoregulatory human monoclonal antibody in schistosomiasis japonica.
abstract: A series of human monoclonal antibodies were generated using splenocytes from a Chinese patient with chronic schistosomiasis who had undergone splenectomy as part of a portacaval decompression operation. Splenocytes were transformed in bulk culture by Epstein Barr virus and transformants fused with the HMMA 2.11 TG/O cell line. Twenty individual IgG antiworm and egg antibody-producing hybridomas were generated and screened for antigen reactivity by Western blot and for suppression of antigen-induced blastogenesis of murine splenocytes from Schistosoma japonicum-infected animals. Only one IgG clone significantly suppressed (56% P less than 0.05) soluble egg antigen (SEA)-induced blastogenesis. This human monoclonal antibody bound a 50 kD carbohydrate antigen on Western blot analysis, binding both the adult worm and egg antigens of this parasite. The non-regulatory monoclonal antibodies bound this same molecule present in adult worms but not the corresponding molecule in a preparation of soluble eggs. Thus, specific immunoregulatory epitopes can be identified by human monoclonal antibodies generated from patients with chronic disease.
authors.affiliation: Department of Medicine, Miriam Hospital, Providence, Rhode Island 02906.
authors.forename: T F
authors.initials: TF
authors.lastname: Kresina
authors.forename: X H
authors.initials: XH
authors.lastname: Guan
authors.forename: M
authors.initials: M
authors.lastname: Posner
authors.forename: A
authors.initials: A
authors.lastname: Wisnewski
authors.forename: G R
authors.initials: GR
authors.lastname: Olds
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis*; D000947:Antigens, Helminth / Q000276:immunology; D002472:Cell Transformation, Viral; D004854:Herpesvirus 4, Human; D006801:Humans; D007074:Immunoglobulin G / Q000096:biosynthesis; D008297:Male; D012549:Schistosoma japonicum / Q000276:immunology; D012554:Schistosomiasis japonica / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000947:Antigens, Helminth; D007074:Immunoglobulin G