Serum amyloid A delivers retinol to intestinal myeloid cells to promote adaptive immunity.

Serum amyloid A delivers retinol to intestinal myeloid cells to promote adaptive immunity.
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DOI:
10.1126/science.abf9232
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发表时间:
2021-09-17
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Hooper LV
Hooper LV
中科院分区:
其他
文献类型:
--
作者:
Bang YJ;Hu Z;Li Y;Gattu S;Ruhn KA;Raj P;Herz J;Hooper LV

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维生素A及其衍生物视黄醇对于肠道适应性免疫的发展至关重要。产生视黄酸(RA)的骨髓细胞是这一过程的核心,但骨髓细胞如何获得视黄醇转化为RA尚不清楚。在这里,我们表明,血清淀粉样蛋白A(SAA)蛋白-视黄醇结合蛋白诱导肠上皮细胞的微生物群-提供视黄醇骨髓细胞。我们确定低密度脂蛋白受体相关蛋白1(LRP 1)作为SAA受体,内吞SAA-视黄醇复合物,促进视黄醇收购的RA生产肠髓细胞。因此,SAA和LRP 1是维生素A依赖性免疫所必需的,包括B和T细胞归巢到肠道和免疫球蛋白A的产生。因此,我们的研究结果确定了维生素A促进肠道免疫的关键机制。血清淀粉样蛋白A通过内吞受体LRP 1将视黄醇递送至产生视黄酸的髓样细胞,从而促进肠道免疫。
Vitamin A and its derivative retinol are essential for the development of intestinal adaptive immunity. Retinoic acid (RA)-producing myeloid cells are central to this process, but how myeloid cells acquire retinol for conversion to RA is unknown. Here, we show that serum amyloid A (SAA) proteins — retinol-binding proteins induced in intestinal epithelial cells by the microbiota — deliver retinol to myeloid cells. We identify LDL receptor-related protein 1 (LRP1) as an SAA receptor that endocytoses SAA–retinol complexes and promotes retinol acquisition by RA-producing intestinal myeloid cells. Consequently, SAA and LRP1 are essential for vitamin A-dependent immunity, including B and T cell homing to the intestine and immunoglobulin A production. Our findings thus identify a key mechanism by which vitamin A promotes intestinal immunity. Serum amyloid A delivers retinol to retinoic acid-producing myeloid cells through the endocytic receptor LRP1, thus promoting gut immunity.
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