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2016 ; 127
(21
): 2618-29
Nephropedia Template TP
gab.com Text
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English Wikipedia
Novel phosphatidylethanolamine derivatives accumulate in circulation in
hyperlipidemic ApoE-/- mice and activate platelets via TLR2
#MMPMID27015965
Biswas S
; Xin L
; Panigrahi S
; Zimman A
; Wang H
; Yakubenko VP
; Byzova TV
; Salomon RG
; Podrez EA
Blood
2016[May]; 127
(21
): 2618-29
PMID27015965
show ga
A prothrombotic state and increased platelet reactivity are common in
dyslipidemia and oxidative stress. Lipid peroxidation, a major consequence of
oxidative stress, generates highly reactive products, including
hydroxy-?-oxoalkenoic acids that modify autologous proteins generating
biologically active derivatives. Phosphatidylethanolamine, the second most
abundant eukaryotic phospholipid, can also be modified by hydroxy-?-oxoalkenoic
acids. However, the conditions leading to accumulation of such derivatives in
circulation and their biological activities remain poorly understood. We now show
that carboxyalkylpyrrole-phosphatidylethanolamine derivatives (CAP-PEs) are
present in the plasma of hyperlipidemic ApoE(-/-) mice. CAP-PEs directly bind to
TLR2 and induces platelet integrin ?IIb?3 activation and P-selectin expression in
a Toll-like receptor 2 (TLR2)-dependent manner. Platelet activation by CAP-PEs
includes assembly of TLR2/TLR1 receptor complex, induction of downstream
signaling via MyD88/TIRAP, phosphorylation of IRAK4, and subsequent activation of
tumor necrosis factor receptor-associated factor 6. This in turn activates the
Src family kinases, spleen tyrosine kinase and PLC?2, and platelet integrins.
Murine intravital thrombosis studies demonstrated that CAP-PEs accelerate
thrombosis in TLR2-dependent manner and that TLR2 contributes to accelerate
thrombosis in mice in the settings of hyperlipidemia. Our study identified the
novel end-products of lipid peroxidation, accumulating in circulation in
hyperlipidemia and inducing platelet activation by promoting cross-talk between
innate immunity and integrin activation signaling pathways.