Key result
Non-calcified or partially-calcified coronary plaque on CT linked to ~2.4-fold higher TNF-α expression in epicardial fat.
Why the study?
The biologic impact of epicardial adipose tissue TNF-α gene expression on coronary atherosclerosis assessed by computed tomography was not well understood.
Cross-Sectional (n=47)
No
Absolute Event Rate: 2.5% vs 1.03%
p-value: p=0.022
Elevated TNF-α gene expression in epicardial adipose tissue is associated with the presence of non-calcified or partially-calcified coronary plaques, suggesting a local inflammatory contribution to coronary atherosclerosis.
TNF-α expression in EAT was associated with noncalcified plaque; leaves open whether regional inflammation drives atherosclerosis progression.
AIMS: Tumor necrosis factor (TNF)-α reportedly has key pro-inflammatory properties in both atherosclerosis and adipocytes. To further investigate the biologic impact of epicardial adipose tissue (EAT) on coronary atherosclerosis, we evaluated the relationship between TNF-α gene expression in EAT and clinically-assessed coronary atherosclerosis on computed tomography (CT). METHODS: We studied 47 patients before cardiac surgery (coronary artery bypass grafting [CABG], n=26; non-CABG, n=21), assessing visceral adipose tissue (VAT) area, EAT volume, coronary calcium score (CCS), and the presence of non- and/or partially-calcified coronary plaque (NCP) on CT angiography. EAT and subcutaneous adipose tissue (SAT) samples were obtained during cardiac surgery. TNF-α mRNA in EAT was measured using quantitative real-time PCR, and normalized to that of SAT as control adipose tissue. RESULTS: There was no difference in the TNF-α expression level between patients scheduled for CABG and non-CABG surgery (p=0.23), or among the subgroups based on CCS (p=0.68), while patients with NCP had the higher TNF-α expression level than those without NCP (median [interquartile range], 2.50 [1.01-5.53] versus. 1.03 [0.64-2.16], p=0.022). On multivariate analysis adjusted for age, sex, coronary risk factors, statin therapy, CABG versus non-CABG, VAT area, and EAT volume, the presence of NCP had close correlation with the elevated TNF-α expression level (β=0.79, p=0.003). CONCLUSIONS: TNF-α expressed regionally in EAT may exert potent effects on the progression of coronary atherosclerosis, suggesting a contribution of EAT to coronary artery disease through behavior of molecule.
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Kitagawa et al. (2017) conducted a cross-sectional in Coronary Atherosclerosis (n=47). Presence of non- and/or partially-calcified coronary plaque (NCP) vs. Absence of NCP was evaluated on Normalized TNF-α gene expression in epicardial adipose tissue (p=0.022). The presence of non- and/or partially-calcified coronary plaque on computed tomography was significantly associated with higher tumor necrosis factor-α gene expression in epicardial adipose tissue (median 2.50 vs 1.03, p=0.022).
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