title: B cells and aging: molecules and mechanisms.
abstract: Recent advances allow aging-associated changes in B-cell function to be approached at a mechanistic level. Reduced expression of genes crucial to lineage commitment and differentiation yield diminished B-cell production. Moreover, intrinsic differences in the repertoire generated by B-cell precursors in aged individuals, coupled with falling B-cell generation rates and life-long homeostatic competition, result in narrowed clonotypic diversity. Similarly, reductions in gene products crucial for immunoglobulin class switch recombination and somatic hypermutation impact the efficacy of humoral immune responses. Together, these findings set the stage for integrated analyses of how age-related changes at the molecular, cellular and population levels interact to yield the overall aging phenotype.
authors.affiliation: Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA 19104-6082, USA. cancro@mail.med.upenn.edu
authors.forename: Michael P
authors.initials: MP
authors.lastname: Cancro
authors.forename: Yi
authors.initials: Y
authors.lastname: Hao
authors.forename: Jean L
authors.initials: JL
authors.lastname: Scholz
authors.forename: Richard L
authors.initials: RL
authors.lastname: Riley
authors.forename: Daniela
authors.initials: D
authors.lastname: Frasca
authors.forename: Deborah K
authors.initials: DK
authors.lastname: Dunn-Walters
authors.forename: Bonnie B
authors.initials: BB
authors.lastname: Blomberg
mesh_terms: D000375:Aging / Q000276:immunology* / Q000378:metabolism; D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D001853:Bone Marrow / Q000276:immunology / Q000378:metabolism; D006706:Homeostasis / Q000276:immunology; D006801:Humans; D054448:Precursor Cells, B-Lymphoid / Q000276:immunology* / Q000378:metabolism; D011947:Receptors, Antigen, B-Cell / Q000276:immunology* / Q000378:metabolism
chemical_list: D011947:Receptors, Antigen, B-Cell