Receptor-mediated immunoglobulin G transport across mucosal barriers in adult life: functional expression of FcRn in the mammalian lung.

Receptor-mediated immunoglobulin G transport across mucosal barriers in adult life: functional expression of FcRn in the mammalian lung.
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DOI:
10.1084/jem.20020400
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发表时间:
2002-08-05
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Lencer WI
Lencer WI
中科院分区:
其他
文献类型:
--
作者:
Spiekermann GM;Finn PW;Ward ES;Dumont J;Dickinson BL;Blumberg RS;Lencer WI

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人胃肠道、呼吸道和生殖道的粘液分泌物含有在宿主防御中一起起作用的免疫球蛋白(IG)G和分泌型伊加(sIgA)。IgG究竟如何穿过上皮屏障在粘膜免疫中发挥作用仍不清楚。在这里,我们测试的想法,MHC I类相关的Fc受体,FcRn,运输IgG跨粘膜表面的人类和小鼠肺从管腔到浆膜。我们发现,支气管上皮细胞的人,非人灵长类动物,和小鼠,表达FcRn在成年生活中,并证明FcRn依赖性吸收的生物活性Fc融合蛋白在小鼠体内的呼吸道上皮。因此,IgG,像二聚体伊加一样,可以通过受体介导的转胞吞作用在成年动物中穿过上皮屏障。这些数据表明,表达FcRn的粘膜表面重吸收IgG,并解释了IgG可能在免疫监视中起作用以检索腔内抗原用于在固有层或全身处理的机制。
Mucosal secretions of the human gastrointestinal, respiratory, and genital tracts contain the immunoglobulins (Ig)G and secretory IgA (sIgA) that function together in host defense. Exactly how IgG crosses epithelial barriers to function in mucosal immunity remains unknown. Here, we test the idea that the MHC class I–related Fc-receptor, FcRn, transports IgG across the mucosal surface of the human and mouse lung from lumen to serosa. We find that bronchial epithelial cells of the human, nonhuman primate, and mouse, express FcRn in adult-life, and demonstrate FcRn-dependent absorption of a bioactive Fc-fusion protein across the respiratory epithelium of the mouse in vivo. Thus, IgG, like dimeric IgA, can cross epithelial barriers by receptor-mediated transcytosis in adult animals. These data show that mucosal surfaces that express FcRn reabsorb IgG and explain a mechanism by which IgG may act in immune surveillance to retrieve lumenal antigens for processing in the lamina propria or systemically.
在聚合物免疫球蛋白受体/分泌成分缺陷的小鼠中,缺乏上皮免疫球蛋白A转运,粘膜泄漏增加。
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期刊: BIOCHIMICA ET BIOPHYSICA ACTA-GENE STRUCTURE AND EXPRESSION
影响因子: --
作者:
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