title: Antigen presenting cell function is enhanced in healthy elderly.
abstract: Aging is associated with a progressive decline in T cell-mediated immune responses. Little is known about the effect of aging on antigen presenting cells (APC). We have recently reported an age-related decline in proliferative response of peripheral blood mononuclear cells from elderly volunteers to Staphylococcus enterotoxin B (SEB). Since SEB-induced stimulation of T cells is not restricted by major histocompatibility complex, experiments were conducted in which T cells and APC from young and healthy elderly subjects were combined. We initially demonstrated the decreased SEB-induced proliferative capacity of elderly T cell elderly APC co-cultures when compared with young T cell young APC co-cultures. Combination of purified T cells from elderly donors with APC from young donors maintained a reduced T cell proliferative response. Age-related decline in T cell function was also established by the reduced proliferative capacity of elderly T cells co-cultured with a reference monocyte cell line. Surprisingly, co-culture of APC from healthy elderly donors with purified T cells from young donors enhanced T cell proliferation. APC from elderly donors also marginally enhanced the proliferative response of an SEB-specific T cell line.
authors.affiliation: West Los Angeles VA Medical Center, Department of Medicine, UCLA, CA 90073, USA.
authors.forename: S C
authors.initials: SC
authors.lastname: Castle
authors.forename: K
authors.initials: K
authors.lastname: Uyemura
authors.forename: W
authors.initials: W
authors.lastname: Crawford
authors.forename: W
authors.initials: W
authors.lastname: Wong
authors.forename: T
authors.initials: T
authors.lastname: Makinodan
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging / Q000276:immunology*; D000938:Antigen-Presenting Cells / Q000166:cytology / Q000276:immunology*; D002478:Cells, Cultured; D018920:Coculture Techniques; D004768:Enterotoxins / Q000276:immunology; D006801:Humans; D013601:T-Lymphocytes / Q000166:cytology / Q000276:immunology*
chemical_list: D004768:Enterotoxins; C031818:enterotoxin B, staphylococcal