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2015 ; 35
(1
): 41-51
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gab.com Text
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English Wikipedia
Immune cell inhibition by SLAMF7 is mediated by a mechanism requiring src
kinases, CD45, and SHIP-1 that is defective in multiple myeloma cells
#MMPMID25312647
Guo H
; Cruz-Munoz ME
; Wu N
; Robbins M
; Veillette A
Mol Cell Biol
2015[Jan]; 35
(1
): 41-51
PMID25312647
show ga
Signaling lymphocytic activation molecule F7 (SLAMF7) is a receptor present on
immune cells, including natural killer (NK) cells. It is also expressed on
multiple myeloma (MM) cells. This led to development of an anti-SLAMF7 antibody,
elotuzumab, showing efficacy against MM. SLAMF7 mediates activating or inhibitory
effects in NK cells, depending on whether cells express or do not express the
adaptor EAT-2. Since MM cells lack EAT-2, we elucidated the inhibitory effectors
of SLAMF7 in EAT-2-negative NK cells and tested whether these effectors were
triggered in MM cells. SLAMF7-mediated inhibition in NK cells lacking EAT-2 was
mediated by SH2 domain-containing inositol phosphatase 1 (SHIP-1), which was
recruited via tyrosine 261 of SLAMF7. Coupling of SLAMF7 to SHIP-1 required Src
kinases, which phosphorylated SLAMF7. Although MM cells lack EAT-2, elotuzumab
did not induce inhibitory signals in these cells. This was at least partly due to
a lack of CD45, a phosphatase required for Src kinase activation. A defect in
SLAMF7 function was also observed in CD45-deficient NK cells. Hence,
SLAMF7-triggered inhibition is mediated by a mechanism involving Src kinases,
CD45, and SHIP-1 that is defective in MM cells. This defect might explain why
elotuzumab eliminates MM cells by an indirect mechanism involving the activation
of NK cells.