title: ICAM-1 (CD54) expression on T lymphocytes and natural killer cells from umbilical cord blood: regulation with interleukin-12 and interleukin-15.
abstract: We investigated the effect of two immunoregulatory cytokines, interleukin (IL)-12 and IL-15, alone or in combination, on intercellular adhesion molecule 1 (ICAM-1, CD54) expression on mononuclear cells (MNC) obtained from umbilical cord blood (CB) and adult peripheral blood (APB). We established that (1) ICAM-1 expression was deficient on freshly isolated CB T and natural killer (NK) cells compared with that on adult cells; (2) ICAM-1 expression on T cells (CD3+/CD54+), but not on NK cells (CD16+/CD54+), was spontaneously upregulated after 7 days' culture in RPMI with 10% fetal calf serum (FCS) in the absence of cytokines, for CB and APB MNC alike; (3) removal of 10% FCS from the medium did not affect the spontaneous CD3+/CD54+ upregulation on APB MNC; (3) CB NK cells responded more readily to IL-12 and IL-15 than did APB NK cells in terms of ICAM-1 expression, while ICAM-1 expression on APB T cells, but not on CB T cells, could be enhanced with IL-12 plus IL-15; (4) the combination of IL-12 and IL-15 downregulated ICAM-1 expression on both CB and APB NK cells. Thus, we demonstrated the different patterns of ICAM-1 regulation by CB MNC and APB MNC in response to IL-12 and/or IL-15 and the differential effect of cytokines on the regulation of adhesion molecules on neonatal NK and T cells.
authors.affiliation: Department of Pediatrics, Chang Gung Children's Hospital, Kweishan, Taoyuan, Taiwan. sjlino@adm.cgmh.org.tw
authors.forename: S J
authors.initials: SJ
authors.lastname: Lin
authors.forename: D C
authors.initials: DC
authors.lastname: Yan
mesh_terms: D000328:Adult; D005312:Fetal Blood / Q000378:metabolism*; D005434:Flow Cytometry; D006801:Humans; D007231:Infant, Newborn; D018799:Intercellular Adhesion Molecule-1 / Q000096:biosynthesis* / Q000097:blood*; D018664:Interleukin-12 / Q000378:metabolism*; D019409:Interleukin-15 / Q000378:metabolism*; D007694:Killer Cells, Natural / Q000378:metabolism*; D013601:T-Lymphocytes / Q000378:metabolism*; D015854:Up-Regulation
chemical_list: D019409:Interleukin-15; D018799:Intercellular Adhesion Molecule-1; D018664:Interleukin-12