Platelet P-selectin facilitates atherosclerotic lesion development.

Content Provider	Semantic Scholar
Author	Burger, Peter C. Wagner, Denisa D.
Copyright Year	2003
Abstract	P-selectin is an adhesion molecule expressed on activated platelets and endothelium. It is known to play an important role in atherosclerosis. P-selectin also circulates in plasma in a soluble form (sP-selectin), which induces procoagulant microparticle formation. We investigated the role of platelet versus endothelial P-selectin in generating sP-selectin and in the formation of atherosclerotic lesions in the apolipoprotein E (apoE)-deficient mouse model. For this we transplanted apoE(-/-)P-selectin(-/-) and apoE(-/-)P-selectin(+/+) lethally irradiated mice with bone marrow of either genotype. Seven months after transplantation, we determined from the chimeric animals that the majority of circulating sP-selectin was of endothelial origin. Thus, in atherosclerosis, the procoagulant sP-selectin reflects endothelial rather than platelet activation. We found that endothelial P-selectin was crucial for the promotion of atherosclerotic lesion growth because in its absence only relatively small lesions developed. However, platelet P-selectin also contributed to the lesion development because lesions in wild-type recipients receiving transplants with wild-type platelets were 30% larger than those receiving P-selectin-deficient platelets (P <.008) and were more frequently calcified (80% versus 44%). In comparison with P-selectin wild-type animals, absence of either endothelial or platelet P-selectin inhibited migration of smooth muscle cells into the lesion. Thus, in addition to endothelium, platelets and their P-selectin also actively promote advanced atherosclerotic lesion development.
Starting Page	298
Ending Page	301
Page Count	4
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.bloodjournal.org/content/bloodjournal/101/7/2661.full.pdf?sso-checked=true
PubMed reference number	12480714v1
Volume Number	101
Issue Number	7
Journal	Blood
Language	English
Access Restriction	Open
Subject Keyword	Apolipoproteins Atherosclerosis Blood Platelet Disorders Blood Platelets Bone Marrow Cell Adhesion Molecules Cell-Derived Microparticles Eighty Large Myocytes, Smooth Muscle P-Selectin Platelet Activation Platelet Count measurement Selectins Smooth muscle (tissue) Transplanted tissue
Content Type	Text
Resource Type	Article