Protein S and Gas6 induce efferocytosis of HIV-1-infected cells.

Abstract:

:Efferocytosis, the phagocytic clearance of apoptotic cells, can provide host protection against certain types of viruses by mediating phagocytic clearance of infected cells undergoing apoptosis. It is known that HIV-1 induces apoptosis and HIV-1-infected cells are efferocytosed by macrophages, although its molecular mechanisms are unknown. To elucidate the roles that efferocytosis of HIV-1-infected cells play in clearance of infected cells, we sought to identify molecules that mediate these processes. We found that protein S, present in human serum, and its homologue, Gas6, can mediate phagocytosis of HIV-1-infected cells by bridging receptor tyrosine kinase Mer, expressed on macrophages, to phosphatidylserine exposed on infected cells. Efferocytosis of live infected cells was less efficient than dead infected cells; however, a significant fraction of live infected cells were phagocytosed over 12h. Our results suggest that efferocytosis not only removes dead cells, but may also contribute to macrophage removal of live virus producing cells.

journal_name

Virology

journal_title

Virology

authors

Chua BA,Ngo JA,Situ K,Ramirez CM,Nakano H,Morizono K

doi

10.1016/j.virol.2017.12.025

subject

Has Abstract

pub_date

2018-02-01 00:00:00

pages

176-190

eissn

0042-6822

issn

1096-0341

pii

S0042-6822(17)30438-5

journal_volume

515

pub_type

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