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Exogenous interleukin-2 does not reverse the immunoinhibitory effects of 1,25-dihydroxyvitamin D3 on human peripheral blood lymphocyte immunoglobulin production.

Abstract：

:1,25-Dihydroxyvitamin D3 (1,25-D3) is known to have potent inhibitory effects on human peripheral blood mononuclear cell (PBMC) functions. Previous experiments suggest that addition of interleukin-2 (IL-2) to cell cultures can reverse the antiproliferative action of 1,25-D3. Previous studies have also shown that the CD4+ T-cell subset is more sensitive to the antiproliferative actions of 1,25-D3 than are the CD8+ T-cells. The objective of this study was to determine whether exogenous IL-2 could reverse the antiproliferative and immunoinhibitory action (inhibition of Ig production) in mitogen-activated PBMC cultures and in fluorescein-activated cell sorting (FACS) experiments where CD8+ T-cells were removed from PBMCs before mitogen stimulation with/without exogenous IL-2 added. In these studies, addition of IL-2 to mitogen-activated, 1,25-D3-treated PBMCs allowed the cells to overcome the 1,25-D3 suppressive effect on cell proliferation. However, exogenous IL-2 did not overcome the 1,25-D3-mediated inhibitory effect on PBMC Ig production. Using FACS lymphocyte populations (CD4+, CD8+ and B-cells), we showed that CD4+ T-cell-directed Ig synthesis in co-culture with autologous B-cells was inhibitable by incubation of cells with 1,25-D3, but Ig synthesis was restored to near-normal levels by addition of exogenous IL-2. This clearly contrasts with the inability of Il-2 to reverse the 1,25-D3 inhibitory effect on Ig synthesis in PBMCs. In other experiments, when CD8+ cells were removed from mitogen-stimulated, 1,25-D3-treated PBMCs, addition of exogenous IL-2 resulted in a full reversal of the 1,25-D3-mediated Ig inhibition. These data suggest that the inability of IL-2 to reverse the inhibitory effects of 1,25-D3 on PBMC Ig production is probably a result of a lack of sensitivity of CD8+ T-cells to the antiproliferative and immunoregulatory actions of 1,25-D3. This is possibly because of a differential expression of 1,25-D3 receptors on CD4+ and CD8+ T-cells.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Jordan SC,Lemire JM,Sakai RS,Toyoda M,Adams JS

doi

10.1016/0161-5890(90)90064-7

subject

Has Abstract

pub_date

1990-01-01 00:00:00

pages

95-100

issue

1

eissn

0161-5890

issn

1872-9142

journal_volume

27

pub_type

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