title: Long-term kinetics of adult human antibody repertoires.
abstract: In healthy humans, antibody repertoires change during ontogeny and senescence. The dynamics of antibody repertoires among adults over a longer period of time in one and the same individual has, however, not been extensively studied. In this study we analysed peripheral blood samples from five healthy adults, taken over a period of 10 weeks and once 9 years later. A competitive, quantitative polymerase chain reaction (PCR) was developed to investigate short and long-term variations in VH gene family repertoires. Serum antibody levels to common self and non-self antigens were determined in samples taken at the same time-points as the cell samples to analyse possible correlations between molecular and serological expression profiles. We found a high degree of stability in the VH gene family repertoire over time as well as between individuals with a Caucasian background. A specific change in the usage of primarily the VH3 and VH5 gene families was observed in one individual at one time-point. The deviating pattern resembled the VH gene family utilization pattern observed in naturally activated B lymphocytes. The fluctuations in VH3 and VH5 gene family expression correlated with the presence of rheumatoid factor in serum. We discuss the possible influence of polyclonal, transient stimulation of B cells on VH gene repertoires, as measured in circulating B cells.
authors.affiliation: Department of Clinical Immunology, Karolinska Institute at Huddinge University Hospital, Stockholm, Sweden. iris.hard@mtc.ki.se
authors.forename: Iris
authors.initials: I
authors.lastname: Van Dijk-Härd
authors.forename: Inger
authors.initials: I
authors.lastname: Lundkvist
mesh_terms: D000328:Adult; D000375:Aging / Q000276:immunology*; D001323:Autoantibodies / Q000096:biosynthesis; D001324:Autoantigens / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology*; D005260:Female; D005803:Genes, Immunoglobulin / Q000276:immunology*; D006801:Humans; D007143:Immunoglobulin Heavy Chains / Q000235:genetics; D007135:Immunoglobulin Variable Region / Q000235:genetics; D007136:Immunoglobulins / Q000097:blood; D008213:Lymphocyte Activation; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction / Q000379:methods
chemical_list: D001323:Autoantibodies; D001324:Autoantigens; D007143:Immunoglobulin Heavy Chains; D007135:Immunoglobulin Variable Region; D007136:Immunoglobulins