SIRPα/CD172a and FHOD1 are unique markers of littoral cells, a recently evolved major cell population of red pulp of human spleen.
SIRPα/CD172a and FHOD1 are unique markers of littoral cells, a recently evolved major cell population of red pulp of human spleen.
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DOI:
10.4049/jimmunol.1103086
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发表时间:
2012-05-01
期刊:
影响因子:
--
通讯作者:
Fingeroth JD
中科院分区:
文献类型:
--
作者:
Ogembo JG;Milner DA Jr;Mansfield KG;Rodig SJ;Murphy GF;Kutok JL;Pinkus GS;Fingeroth JD
Asplenic individuals are compromised not only in their ability to destroy infectious agents, but are at increased risk of death from autoimmune disease, certain tumors, and ischemic heart disease. Enhanced mortality is attributed to lack of phagocytes sequestered in spleen that efficiently engulf and destroy appropriate targets, though related cells are found elsewhere. To determine whether a unique population regulates RBC-pathogen clearance and filtration of altered self, we reviewed the anatomic literature and analyzed in situ by immunohistochemistry and immunofluorescence the expression patterns of a little-characterized cell that dominates the splenic red pulp of man and closely related primates-the venous sinus lining or littoral cell (LC). High expression of the formin FHOD1 outlines the LC population. Though LCs are endothelial-like in distribution they express several macrophage directed proteins, the RBC antigen DARC and T-cell co-receptor CD8α/α yet they lack lineage-associated markers CD34 and CD45. Strikingly, SIRPα (CD172a) expression in human spleen concentrates on LCs, consistent with recent demonstration of a key role in RBC turnover and elimination versus release of infected or altered self. Our results indicate human LCs (SIRPα+, FHOD1+, CD8α/α+, CD34−, CD45−) comprise a highly plastic barrier cell population that emerged late in primate evolution coordinate with CD8 expression. Unique to Hominidae, LCs may be the ultimate determinant of which cells re-circulate after passage through human spleen.
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DOI:
10.1073/pnas.0906549106
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