METHODS: Plasma levels of 4
ceramide species (C16:0, C22:0, C24:0, and C24:1) were measured among 398 women (73% HIV+) and 339 men (68% HIV+) without
carotid artery plaques at baseline from the Women's Interagency HIV Study and the Multicenter
AIDS Cohort Study. We examined associations between baseline plasma
ceramides and risk of
carotid artery plaque formation, assessed by repeated B-mode carotid artery ultrasound imaging over a median 7-year follow-up.
RESULTS: Plasma levels of C16:0, C22:0, and C24:1
ceramides were significantly higher in HIV-infected individuals compared with those without
HIV infection (all P<0.001), and further analysis indicated that elevated
ceramide levels were associated with antiretroviral
therapy use, particularly
protease inhibitor use, in HIV-infected individuals (all P<0.001). All 4
ceramides were highly correlated with each other ( r=0.70-0.94; all P<0.001) and significantly correlated with total-
cholesterol ( r=0.42-0.58; all P<0.001) and
low-density lipoprotein cholesterol ( r=0.24-0.42; all P<0.001) levels. Of note, C16:0 and C24:1
ceramides, rather than C22:0 and C24:0
ceramides, were more closely correlated with specific monocyte activation and
inflammation markers (eg, r=0.30 between C16:0
ceramide and
soluble CD14; P<0.001) and surface markers of CD4+ T-cell activation. A total of 112 participants developed
carotid artery plaques over 7 years, and higher levels of C16:0 and C24:1
ceramides were significantly associated with increased risk of
carotid artery plaques (relative risk [95% CI]=1.55 [1.29, 1.86] and 1.51 [1.26, 1.82] per standard deviation increment, respectively; both P<0.001), after adjusting for demographic and behavioral factors. After further adjustment for
cardiovascular disease risk factors and immune activation markers, these associations were attenuated but remained significant. The results were consistent between men and women and between HIV-infected and HIV-uninfected participants.
CONCLUSIONS: In 2 HIV cohorts, elevated plasma levels of C16:0 and C24:1
ceramides, correlating with immune activation and
inflammation, were associated with antiretroviral
therapy use and progression of carotid artery
atherosclerosis.