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2015 ; 34
(22
): 2775-88
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Immunomodulatory activity of extracellular Hsp70 mediated via paired receptors
Siglec-5 and Siglec-14
#MMPMID26459514
Fong JJ
; Sreedhara K
; Deng L
; Varki NM
; Angata T
; Liu Q
; Nizet V
; Varki A
EMBO J
2015[Nov]; 34
(22
): 2775-88
PMID26459514
show ga
The intracellular chaperone heat-shock protein 70 (Hsp70) can be secreted from
cells, but its extracellular role is unclear, as the protein has been reported to
both activate and suppress the innate immune response. Potential immunomodulatory
receptors on myelomonocytic lineage cells that bind extracellular Hsp70 are not
well defined. Siglecs are Ig-superfamily lectins on mammalian leukocytes that
recognize sialic acid-bearing glycans and thereby modulate immune responses.
Siglec-5 and Siglec-14, expressed on monocytes and neutrophils, share identical
ligand-binding domains but have opposing signaling functions. Based on
phylogenetic analyses of these receptors, we predicted that endogenous sialic
acid-independent ligands should exist. An unbiased screen revealed Hsp70 as a
ligand for Siglec-5 and Siglec-14. Hsp70 stimulation through Siglec-5 delivers an
anti-inflammatory signal, while stimulation through Siglec-14 is
pro-inflammatory. The functional consequences of this interaction are also
addressed in relation to a SIGLEC14 polymorphism found in humans. Our results
demonstrate that an endogenous non-sialic acid-bearing molecule can be either a
danger-associated or self-associated signal through paired Siglecs, and may
explain seemingly contradictory prior reports on extracellular Hsp70 action.