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Side-specific expression of activated leukocyte adhesion molecule (ALCAM; CD166) in pathosusceptible regions of swine aortic valve endothelium.

Aortic valve sclerosis (AVS), an early form of aortic valve disease, develops preferentially on the aortic side of valve leaflets, a predilection that is reflected in an heterogeneous side-specific gene expression profile. It has been ascertained that hypercholesterolemia is sufficient to initiate the endothelial expression of activated leukocyte adhesion molecule (ALCAM; CD166), restricted to the aortic side of the leaflet. Intercellular adhesion molecule-1 (ICAM-1) or vascular cell adhesion molecule-1 (VCAM-1)--both of which are more typically associated with early arterial inflammation--are not differentially expressed. ALCAM up-regulation by hypercholesterolemia suggests a side-specific spatial role in the recruitment of leukocytes to AVS sites.