title: In vitro IgM and IgM rheumatoid factor production in response to Staphylococcus aureus Cowan I and pokeweed mitogen: the contribution of CD5+ (Leu 1) B cells.
abstract: The relation between the percentage of circulating CD5+ CD20+ B cells and the ability to synthesize IgM and IgM rheumatoid factor (RF) in vitro in response to pokeweed mitogen (PWM) and Staphylococcus aureus Cowan I (SAC) was assessed in 21 healthy controls. CD5+ CD20+ cells ranged from 7.3 to 19.9% of total CD20+ B cells. By Spearman's rank correlation, there was an inverse relation between the percentage of CD5+ CD20+ B cells and IgM production in response to PWM (rs = -0.452, p less than 0.05) and a direct correlation with RF production in response to SAC (rs = 0.450, P less than 0.05). The percentage of CD5+ CD20+ B cells was not related to any serologic HLA-A, B, C or D antigen. Healthy individuals may be predisposed to producing IgM or autoantibodies based on the percentage of circulating CD5+ Cd20+ B cells.
authors: Department of Medicine, University of Ottawa, Ottawa General Hospital, Ontario, Canada.
authors: J
authors: J
authors: Karsh
authors: R
authors: R
authors: Goldstein
authors: A I
authors: AI
authors: Lazarovits
mesh_terms: D018951:Antigens, CD20; D000943:Antigens, Differentiation / Q000032:analysis; D000944:Antigens, Differentiation, B-Lymphocyte / Q000032:analysis; D001402:B-Lymphocytes / Q000276:immunology*; D018956:CD5 Antigens; D006801:Humans; D007075:Immunoglobulin M / Q000096:biosynthesis*; D011043:Pokeweed Mitogens; D012217:Rheumatoid Factor / Q000096:biosynthesis*; D013211:Staphylococcus aureus / Q000276:immunology*
chemical_list: D018951:Antigens, CD20; D000943:Antigens, Differentiation; D000944:Antigens, Differentiation, B-Lymphocyte; D018956:CD5 Antigens; D007075:Immunoglobulin M; D011043:Pokeweed Mitogens; D012217:Rheumatoid Factor