title: Differences in the degree of depletion, rate of recovery, and the preferential elimination of naive CD4+ T cells by anti-CD4 monoclonal antibody (GK1.5) in young and aged mice.
abstract: We compared the degrees of depletion and the rates of recovery of CD4+ T cells in young and old mice given a single injection of an anti-CD4 (GK1.5) mAb. We found that in young mice the CD4+ population of T cells was completely depleted from the peripheral blood and, subsequently, the lymph nodes and spleen. Young mice recovered 80% of CD4+ T cells within 100 days after the injection. Although aged mice have less CD4+ T cells, CD4+ T cells were depleted by only 60% after mAb injection. This finding was associated with prolonged circulation of Ab-coated T cells. The rate of repopulation of peripheral CD4+ T cells was also affected by aging, because 5 times less CD4+ T cells appear in aged than in young mice between days 14 and 100 post injection. Further, we found that the CD4+ T cells that are depleted in both young and old mice by injection of anti-CD4 mAb are CD45RBhigh, suggesting a preferential depletion of immature cells. Finally, the thymus appears to be required to repopulate the T cell population post injection, because thymectomized young mice failed to recover CD3+CD4+ cells.
authors.affiliation: Division of Nephrology, University of Texas Medical Branch, Galveston 77555, USA.
authors.forename: J C
authors.initials: JC
authors.lastname: Rice
authors.forename: R P
authors.initials: RP
authors.lastname: Bucy
mesh_terms: D000375:Aging / Q000276:immunology; D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology*; D017252:CD3 Complex / Q000378:metabolism; D015496:CD4-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology*; D002352:Carrier Proteins / Q000378:metabolism; D002454:Cell Differentiation; D018960:Hyaluronan Receptors; D017493:Leukocyte Common Antigens / Q000378:metabolism; D018655:Lymphocyte Count; D008212:Lymphocyte Depletion / Q000379:methods*; D008221:Lymphoid Tissue / Q000166:cytology / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D011956:Receptors, Cell Surface / Q000378:metabolism; D016201:Receptors, Lymphocyte Homing / Q000378:metabolism; D013934:Thymectomy; D013950:Thymus Gland / Q000276:immunology; D013997:Time Factors
chemical_list: D000911:Antibodies, Monoclonal; D017252:CD3 Complex; D002352:Carrier Proteins; D018960:Hyaluronan Receptors; D011956:Receptors, Cell Surface; D016201:Receptors, Lymphocyte Homing; D017493:Leukocyte Common Antigens