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Serum-derived MHC class II molecules: potent regulators of the cellular and humoral immune response.

Abstract：

:Soluble MHC antigens are detected in body fluids but their role and origin are still unclear. This study examined whether serum IA antigens, isolated from BALB/c mice (sIA(d)), could modulate the immune response. Specific purification procedures isolated intact IA molecules, which were thereafter applied to functional assays. Thus, sIA(d) were shown to stimulate spleen cell proliferation and the major target was identified to be the CD4(+) cell population. Inhibition of the CD4 co-receptor using specific neutralizing antibodies destroyed the sIA(d)-mediated proliferative activity, while sIA(d) successfully antagonized surface IA(d) antigens for binding to anti-IA(d) antibody. Serum-IA(d) stimulated BALB/c versus C3H/HeN but not C3H/HeN versus BALB/c mixed lymphocyte reactions, while increasing responsiveness to Legionella pneumophila. However, sIA(d) displayed an inhibitory activity during the effector phase of the humoral response, since they inhibited the anti-DNP-specific IgM production to a DNP-HSA hapten-carrier system. Furthermore, sIA(d) molecules increased Th1/Th2 cytokines during the L. pneumophila stimulus, while decreasing IL-2, GM-CSF and increasing IL-4, IL-15 during the DNP-HSA stimulus. These results suggest that sIA(d), following steps similar to surface class II antigen binding mechanisms, stimulate the initiation of a humoral or cellular immune response but rather inhibit the effector phase of the reactions, attributing thus soluble class II MHC antigens important immunomodulatory roles.

journal_name

Immunobiology

journal_title

Immunobiology

authors

Marios-Frankiskos S,Panagiota M,Katerina B,Athanassakis I

doi

10.1016/j.imbio.2009.04.005

subject

Has Abstract

pub_date

2010-03-01 00:00:00

pages

194-205

issue

3

eissn

0171-2985

issn

1878-3279

pii

S0171-2985(09)00081-3

journal_volume

215

pub_type

杂志文章

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