title: Age-related accumulation of memory cells in mouse Peyer's patches.
abstract: The development of memory cells seems to take place in the germinal centres, which are chronically present in Peyer's patches (PPs). We report here age-associated changes in the lymphocyte compartment and in the number of PPs of unimmunised mice. Mice 4 weeks old do not exhibit well constituted germinal centres, but just only 1 week later, the mice develop a normal germinal centre reaction, which is maintained until late ages (mice 30 weeks old), to decrease thereafter in older mice. In addition, we also show that memory cells accumulate in PPs in old mice, being the main population CD44(+) CD62L(-) CD49d(+) CD40(+) CD25(-) B cells. These data suggest that memory B cells tend to accumulate in PPs in ageing mice, even when the GC reaction has already decreased.
authors.affiliation: Area of Immunology, Faculty of Sciences, University of Vigo, Lagoas Marcosende s/n, 36200 Vigo, Pontevedra, Spain.
authors.forename: Marta Sánchez
authors.initials: MS
authors.lastname: Carril
authors.forename: Joaquín Prado
authors.initials: JP
authors.lastname: Aragón
authors.forename: Africa
authors.initials: A
authors.lastname: González Fernández
mesh_terms: D000375:Aging / Q000276:immunology*; D000818:Animals; D015703:Antigens, CD; D000944:Antigens, Differentiation, B-Lymphocyte; D015415:Biomarkers; D051927:CD24 Antigen; D019013:CD40 Antigens; D007156:Immunologic Memory; D039441:Integrin alpha4; D008214:Lymphocytes / Q000276:immunology*; D008562:Membrane Glycoproteins; D051379:Mice; D010581:Peyer's Patches / Q000166:cytology / Q000276:immunology*; D015375:Receptors, Interleukin-2; D011990:Receptors, Transferrin
chemical_list: D015703:Antigens, CD; D000944:Antigens, Differentiation, B-Lymphocyte; D015415:Biomarkers; D051927:CD24 Antigen; D019013:CD40 Antigens; C068126:CD71 antigen; C497890:Cd24a protein, mouse; D008562:Membrane Glycoproteins; D015375:Receptors, Interleukin-2; D011990:Receptors, Transferrin; D039441:Integrin alpha4