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Intracellular trafficking of beta2-glycoprotein I complexes with lipid vesicles in macrophages: implications on the development of antiphospholipid syndrome.

Abstract：

:Beta(2)-glycoprotein I (beta(2)GPI) is known as a major autoantigen for antiphospholipid antibodies. Our recent data show that binding of beta(2)GPI to oxidized low-density lipoprotein (oxLDL) or to liposomes containing anionic phospholipid(s) may facilitate the presentation of beta(2)GPI's epitope by macrophages/dendritic cells to autoreactive T cells. In the present study, we investigated intracellular trafficking of beta(2)GPI and its complexes with oxLDL or liposomes containing phosphatidylserine (PS-liposomes) in mouse macrophage-like J774 cells. A relatively small amount of non-complexed beta(2)GPI was taken up and stagnated in the late endosome after incubating for 16h. In contrast, beta(2)GPI complexes with oxLDL or PS-liposomes were transported into the lysosome. In the presence of the IgG anti-beta(2)GPI autoantibody, WB-CAL-1, beta(2)GPI/oxLDL complexes were rapidly incorporated into intracellular space and were finally localized in the lysosome. Interestingly, in vitro pulses by beta(2)GPI/oxLDL complexes together with WB-CAL-1 led to the expression of membranous CD36 as well as Fcgamma type I receptors (FcgammaRI). These observations suggest that IgG immune complexes of beta(2)GPI/oxLDL provide not only FcgammaRI- but also scavenger receptor-mediated uptake of beta(2)GPI/oxLDL complexes by macrophages. Thus, beta(2)GPI/oxLDL complexes as a major atherogenic autoantigen and IgG anti-beta(2)GPI autoantibodies may facilitate antigen presentation and foam cell formation in antiphospholipid syndrome.

journal_name

J Autoimmun

journal_title

Journal of autoimmunity

authors

Kajiwara T,Yasuda T,Matsuura E

doi

10.1016/j.jaut.2007.07.003

subject

Has Abstract

pub_date

2007-09-01 00:00:00

pages

164-73

issue

2-3

eissn

0896-8411

issn

1095-9157

pii

S0896-8411(07)00082-0

journal_volume

29

pub_type

杂志文章

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