title: Absence of P-selectin delays fatty streak formation in mice.
abstract: P-selectin is expressed on activated endothelium and platelets where it can bind monocytes, neutrophils, stimulated T cells, and platelets. Because recruitment of these cells is critical for atherosclerotic lesion development, we examined whether P-selectin might play a role in atherosclerosis. We intercrossed P-selectin-deficient mice with mice lacking the low density lipoprotein receptor (LDLR) because these mice readily develop atherosclerotic lesions on diets rich in saturated fat and cholesterol. The atherogenic diet stimulated leukocyte rolling in the mesenteric venules of LDLR-deficient mice, and the increase in adhesiveness of the vessels was P-selectin-dependent. Most likely due to the reduced leukocyte interaction with the vessel wall, P-selectin-deficient mice on diet for 8-20 wk formed significantly smaller fatty streaks in the cusp region of the aortae than did P-selectin-positive mice. This difference was more prominent in males. At 37 wk on diet, the lesions in the LDLR-deficient animals progressed to the fibrous plaque stage and were distributed throughout the entire aorta; their size or distribution was no longer dependent on P-selectin. Our results show that P-selectin-mediated adhesion is an important factor in the development of early atherosclerotic lesions, and that adhesion molecules such as P-selectin are involved in the complex process of atherosclerosis.
authors.affiliation: Center for Blood Research, Harvard Medical School, Boston, Massachusetts 02115, USA.
authors.forename: R C
authors.initials: RC
authors.lastname: Johnson
authors.forename: S M
authors.initials: SM
authors.lastname: Chapman
authors.forename: Z M
authors.initials: ZM
authors.lastname: Dong
authors.forename: J M
authors.initials: JM
authors.lastname: Ordovas
authors.forename: T N
authors.initials: TN
authors.lastname: Mayadas
authors.forename: J
authors.initials: J
authors.lastname: Herz
authors.forename: R O
authors.initials: RO
authors.lastname: Hynes
authors.forename: E J
authors.initials: EJ
authors.lastname: Schaefer
authors.forename: D D
authors.initials: DD
authors.lastname: Wagner
mesh_terms: D000818:Animals; D001011:Aorta / Q000473:pathology; D001161:Arteriosclerosis / Q000209:etiology / Q000235:genetics* / Q000378:metabolism*; D002448:Cell Adhesion / Q000187:drug effects / Q000502:physiology*; D002465:Cell Movement / Q000187:drug effects; D002784:Cholesterol / Q000032:analysis / Q000097:blood; D002791:Cholesterol, Dietary / Q000494:pharmacology; D004036:Diet, Atherogenic; D004041:Dietary Fats / Q000494:pharmacology; D005260:Female; D007962:Leukocytes / Q000187:drug effects; D008074:Lipoproteins / Q000032:analysis / Q000097:blood; D008264:Macrophages; D008297:Male; D008642:Mesenteric Veins / Q000187:drug effects; D051379:Mice; D008810:Mice, Inbred C57BL; D008817:Mice, Mutant Strains; D009130:Muscle, Smooth / Q000166:cytology; D011973:Receptors, LDL / Q000235:genetics*; D019087:Selectins / Q000235:genetics* / Q000502:physiology*; D012737:Sex Factors; D014280:Triglycerides / Q000032:analysis / Q000097:blood
chemical_list: D002791:Cholesterol, Dietary; D004041:Dietary Fats; D008074:Lipoproteins; D011973:Receptors, LDL; D019087:Selectins; D014280:Triglycerides; D002784:Cholesterol