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Lipoprotein-associated phospholipase A2 is associated with atherosclerotic stroke risk: the Northern Manhattan Study Katan M; Moon YP; Paik MC; Wolfert RL; Sacco RL; Elkind MSPLoS One 2014[]; 9 (1): e83393BACKGROUND: Lipoprotein-associated phospholipase A2 (LpPLA2) levels are associated with stroke, though whether this extends to all populations and stroke subtypes is unknown. METHODS: Serum samples from stroke-free community participants in the Northern Manhattan Study were assayed for LpPLA2 mass and activity. Participants were followed annually for stroke. Cox-proportional-hazard models were fitted to estimate hazard-ratios and 95% confidence intervals (HR, 95% CI) for the association of LpPLA2 levels with ischemic stroke (IS), after adjusting for demographic and medical risk factors. RESULTS: Serum samples were available in 1946 participants, of whom 151 (7.8%) experienced a first IS during median follow-up 11 years. Mean age was 69 (SD 10), 35.6% were men, 20% non-Hispanic Whites, 22% non-Hispanic Blacks, and 55% Hispanics. LpPLA2 mass and activity levels were not associated with overall IS risk. LpPLA2 mass but not activity levels were associated with strokes due to large artery atherosclerosis (LAA; adjusted HR per SD 1.55, 95% CI 1.17-2.04). There was a dose-response relationship with LAA (compared to first quartile, 2nd quartile HR = 1.43, 95% CI 0.23-8.64; 3rd quartile HR = 4.47, 95% CI 0.93-21.54; 4th quartile HR = 5.07, 95% CI 1.07-24.06). The associations between LpPLA2-mass and LAA-stroke risk differed by race-ethnicity (p = 0.01); LpPLA2-mass was associated with increased risk of LAA among non-Hispanic Whites (adjusted HR per SD 1.44, 95% CI 0.98-2.11), but not other race-ethnic groups. CONCLUSION: LpPLA2-mass levels were associated with risk of atherosclerotic stroke among non-Hispanic White participants, but not in other race-ethnic groups in the cohort. Further study is needed to confirm these race-ethnic differences and the reasons for them.|1-Alkyl-2-acetylglycerophosphocholine Esterase[MESH]|Aged[MESH]|Atherosclerosis/*complications/*enzymology/epidemiology/ethnology[MESH]|Brain Ischemia/enzymology/ethnology/etiology[MESH]|Female[MESH]|Humans[MESH]|Incidence[MESH]|Male[MESH]|New York/ethnology[MESH]|Phospholipases A2/*metabolism[MESH]|Risk Factors[MESH]|Stroke/*enzymology/epidemiology/ethnology/*etiology[MESH] |
