Summary
Endothelial damage is present in HIV infection but our understanding of markers and
mechanisms is incomplete. We found increased levels of markers of endothelial cell
damage such as von Willebrand factor (vWf), soluble thrombomodulin (sTM) and adhesion
molecule E- selectin in 90 subjects seropositive for HIV relative to healthy controls.
sTM was strongly raised in those patients with the lowest CD4+ cell count (p <0.001),
but levels of vWf increased at each incremental fall in CD4+ cell count and the two
indices correlated significantly (r = -0.485, p <0.001). vWf correlated strongly with
levels of the inflammatory cytokines tumor necrosis factor (TNF-α) and alpha interferon
(IFN-α) but sTM correlated only weakly with IFN-α. We suggest that increased vWf is
largely the result of inflammatory stimulus of the endothelium but that sTM is found
only in those patients with more severe disease, and so truely represents endothelial
damage.