Introduction: Measures of pulmonary function are associated with cardiovascular disease risk; however, the underlying mechanism remains unclear. Hypothesis: We hypothesize that protein biomarkers are associated with pulmonary function decline, as well as the risk of subsequent incident coronary heart disease (CHD), heart failure (HF), and mortality. Methods: We included participants from the Atherosclerosis Risk in Communities (ARIC) study with plasma proteome measured by SOMAscan and spirometric measures (forced expiratory volume in the first second (FEV1) and forced vital capacity (FVC)) at both visits 2 (1990-1992) and 5 (2011-2013). Cross-sectional associations of protein levels with FEV1 and FVC at both visits were assessed using multivariable linear regression. The decline of FEV1 was evaluated among proteins related to cross-sectional FEV1 and FVC measures. The FEV1-decline-related proteins were further probed into the effects on incident CHD, HF, and mortality, using Cox proportional hazard models post-visit 2. Results: Out of 4,677 proteins, 364 were cross-sectionally associated with both FEV1 and FVC at visit 2 (n=11,354, age 57, 23% blacks, and 56% women) and 5 (n=3,517, age 75, 17% blacks, and 58% women) at FDR <0.05. Twenty-seven of 364 proteins were associated with FEV1 decline between visits (FDR <0.05). The protein effects were more predominant in women than men (p <0.001). Among 27 FEV1 decline-related proteins, 25 and 27 were associated with incident HF and mortality during an average of 29 years follow-up (FDR <0.05, Figure ). Gamma-aminobutyric acid receptor-associated protein showed the greatest effect with FEV1 decline, and its per SD increase was associated with 20% higher risk of HF and mortality. Compared to HF and mortality, FEV1 decline-related proteins were less associated with incident CHD. Conclusions: Twenty-seven proteins related to pulmonary function decline were heavily associated with the risk of HF and mortality, suggesting shared etiology between those conditions.
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