Elevated Microparticle Tissue Factor Activity Is Associated With Carotid Artery Plaque in HIV-Infected Women

Background: Expression of tissue factor (TF) on the surface of activated monocytes may trigger thrombosis, leading to clotting risk, inflammation, and atherosclerosis. TF-positive microparticles (MP-TF) represent a functionally active form of TF that may be promulgated by long-term HIV infection. We hypothesized that greater MP-TF activity is associated with carotid artery plaque in HIV+ women. Setting: In a case–control study nested within the Women's Interagency HIV Study (WIHS), eligible HIV+ participants underwent B-mode carotid artery ultrasound at 2 study visits occurring 7 years apart. Cases were defined by the presence of at least 1 carotid artery plaque assessed at either visit. Cases were matched 1:2 to controls who were found not to have carotid artery plaques. Methods: Conditional logistic regression estimated the association of MP-TF activity with the presence of carotid artery plaque, adjusting for demographic and behavioral characteristics, HIV-related factors, cardiometabolic risk factors, and serum inflammation biomarkers (high-sensitivity C-reactive protein, IL-6, sCD14, sCD163, Gal-3, and Gal-3BP). Results: Elevated MP-TF activity (>0.537 pg/mL) was found to be significantly associated with greater odds of plaque (adjusted odds ratio 3.86, 95% confidence interval: 1.06 to 14.07, P = 0.04). The association was attenuated after further adjustment for IL-6 but was unaffected by adjustment for other biomarkers including those denoting monocyte activation. Conclusions: Our findings suggest a link among HIV infection, innate immune system perturbation, coagulation, and atherosclerosis.

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