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:
影响因子:
--
通讯作者:
Hooper LV
中科院分区:
文献类型:
--
作者:
Bang YJ;Hu Z;Li Y;Gattu S;Ruhn KA;Raj P;Herz J;Hooper LV
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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