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2014 ; 124
(15
): 2431-41
Nephropedia Template TP
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CEACAM2 negatively regulates hemi (ITAM-bearing) GPVI and CLEC-2 pathways and
thrombus growth in vitro and in vivo
#MMPMID25085348
Alshahrani MM
; Yang E
; Yip J
; Ghanem SS
; Abdallah SL
; deAngelis AM
; O'Malley CJ
; Moheimani F
; Najjar SM
; Jackson DE
Blood
2014[Oct]; 124
(15
): 2431-41
PMID25085348
show ga
Carcinoembryonic antigen-related cell adhesion molecule-2 (CEACAM2) is a
cell-surface glycoprotein expressed on blood, epithelial, and vascular cells.
CEACAM2 possesses adhesive and signaling properties mediated by immunoreceptor
tyrosine-based inhibitory motifs. In this study, we demonstrate that CEACAM2 is
expressed on the surface and in intracellular pools of platelets. Functional
studies of platelets from Ceacam2(-/-)-deficient mice (Cc2(-/-)) revealed that
CEACAM2 serves to negatively regulate collagen glycoprotein VI (platelet)
(GPVI)-FcR?-chain and the C-type lectinlike receptor 2 (CLEC-2) signaling.
Cc2(-/-) platelets displayed enhanced GPVI and CLEC-2-selective ligands,
collagen-related peptide (CRP), collagen, and rhodocytin (Rhod)-mediated platelet
aggregation. They also exhibited increased adhesion on type I collagen, and
hyperresponsive CRP and CLEC-2-induced ? and dense granule release compared with
wild-type platelets. Furthermore, using intravital microscopy to ferric chloride
(FeCl3)-injured mesenteric arterioles and laser-induced injury of cremaster
muscle arterioles, we herein show that thrombi formed in Cc2(-/-) mice were
larger and more stable than wild-type controls in vivo. Thus, CEACAM2 is a novel
platelet immunoreceptor that acts as a negative regulator of platelet
GPVI-collagen interactions and of ITAM receptor CLEC-2 pathways.