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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
Circulating adhesion molecules in apoE-deficient mouse strains with different atherosclerosis susceptibility.
Biochemical and Biophysical Research Communications 2005 April 16
Recruitment of inflammatory cells in the arterial wall by vascular adhesion molecules plays a key role in development of atherosclerosis. Apolipoprotein E-deficient (apoE(-/-)) mice have spontaneous hyperlipidemia and develop all phases of atherosclerotic lesions. We sought to examine plasma levels of soluble vascular cell adhesion molecule-1 (sVCAM-1) and sP-selectin in two apoE(-/-) strains C57BL/6 (B6) and BALB/c with early or advanced lesions. Mice were fed chow or a Western diet containing 42% fat, 0.15% cholesterol, and 19.5% casein. On either diet, BALB/c.apoE(-/-) mice developed much smaller atherosclerotic lesions and displayed significantly lower levels of sVCAM-1 and sP-selectin than B6.apoE(-/-) mice. The Western diet significantly elevated sVCAM-1 levels in both strains and sP-selectin levels in B6.apoE(-/-) mice. BALB/c.apoE(-/-) mice exhibited 2-fold higher HDL cholesterol levels on the chow diet and 15-fold higher HDL levels on the Western diet than B6.apoE(-/-) mice, although the two strains had comparable levels of total cholesterol and triglyceride. Thus, increased atherosclerosis is accompanied by increases in circulating VCAM-1 and P-selectin levels in the two apoE(-/-) mouse strains, and the high HDL level may protect against atherosclerosis by inhibiting the expression of adhesion molecules in BALB/c.apoE(-/-) mice.
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