title: Polyclonal activation of CR+ and CR- B lymphocytes: the kinetics of initiation of DNA and immunoglobulin synthesis by lipopolysaccharide.
abstract: B cells that carry the complement receptor (CR+) were separated from B cells that lack the complement receptor (CR-) by velocity sedimentation or by passage through C-coated Sephadex columns. The kinetics of responses to bacterial lipopolysaccharide (LPS) in both B cell subpopulations were determined in three assay procedures: 1) incorporation of radioactive thymidine into DNA; 2) incorporation of radioactive leucine into immunoglobulin; 3) enumeration of cells forming polyclonal antibody to the 2,4,6-trinitrophenyl hapten. Although both subpopulations of B cells responded to LPS, they differed in the time course. CR- B cells responded with a delay of approximately 24 hr as compared with the response of CR+ B cells. The implications to the ontogenetic status of CR+ and CR- B subpopulations are discussed.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology*; D001665:Binding Sites; D003165:Complement System Proteins; D004247:DNA / Q000096:biosynthesis*; D005260:Female; D007136:Immunoglobulins / Q000096:biosynthesis*; D007700:Kinetics; D008070:Lipopolysaccharides / Q000494:pharmacology*; D008213:Lymphocyte Activation; D008297:Male; D051379:Mice; D008809:Mice, Inbred C3H; D011817:Rabbits; D012397:Rosette Formation; D013601:T-Lymphocytes / Q000276:immunology; D013997:Time Factors
chemical_list: D007136:Immunoglobulins; D008070:Lipopolysaccharides; D003165:Complement System Proteins; D004247:DNA