title: Cloning of in vivo-derived thioguanine-resistant human B cells.
abstract: In vivo-derived thioguanine-resistant (TGr) B cells have been cloned from peripheral blood mononuclear cells (PBMC) of 4 healthy adults. This was done by using Epstein-Barr (EB) virus transformation of B cells enriched from a large number of PBMC obtained with a blood cell separator. The cloned TGr B cells lacked hypoxanthine guanine phosphoribosyltransferase (HPRT) enzyme activity. The frequency of in vivo TGr B cells was estimated to be 8.6-13.1 X 10(-6) for the 4 individuals by comparing the cloning efficiency of non-selected cells and TG-selected cells. This frequency is somewhat higher but comparable to the in vivo frequency of TGr T cells. Because the cloned TGr B cells can be easily expanded in vitro, this procedure provides a large amount of material for the precise characterization of in vivo mutations in humans.
authors.affiliation: Department of Radiobiology, Radiation Effects Research Foundation, Hiroshima, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Hakoda
authors.forename: Y
authors.initials: Y
authors.lastname: Hirai
authors.forename: Y
authors.initials: Y
authors.lastname: Kusunoki
authors.forename: M
authors.initials: M
authors.lastname: Akiyama
mesh_terms: D000944:Antigens, Differentiation, B-Lymphocyte / Q000032:analysis; D001402:B-Lymphocytes / Q000187:drug effects*; D002469:Cell Separation; D002472:Cell Transformation, Viral; D002999:Clone Cells; D004351:Drug Resistance; D004854:Herpesvirus 4, Human; D006801:Humans; D007041:Hypoxanthine Phosphoribosyltransferase / Q000235:genetics*; D013866:Thioguanine / Q000633:toxicity*
chemical_list: D000944:Antigens, Differentiation, B-Lymphocyte; D007041:Hypoxanthine Phosphoribosyltransferase; D013866:Thioguanine