Abstract:
AIMS:Obesity, diabetes and cardiovascular disease are associated with COVID-19 risk and severity. Because epicardial adipose tissue (EAT) expresses ACE2, we wanted to identify the main factors associated with ACE2 levels and its cleavage enzyme, ADAM17, in epicardial fat. MATERIALS AND METHODS:Epicardial and subcutaneous fat biopsies were obtained from 43 patients who underwent open-heart surgery. From 36 patients, biopsies were used for RNA expression analysis by real-time PCR of ACE1, ACE2 and ADAM17. From 8 patients, stromal vascular cells were submitted to adipogenesis or used for studying the treatment effects on gene expression levels. Soluble ACE2 was determined in supernatants by ELISA. RESULTS:Epicardial fat biopsies expressed higher levels of ACE2 (1.53 [1.49-1.61] vs 1.51 [1.47-1.56] a.u., P < .05) and lower ADAM17 than subcutaneous fat (1.67 [1.65-1.70] vs 1.70 [1.66-1.74] a.u., P < .001). Both genes were increased in epicardial fat from patients with type 2 diabetes mellitus (T2DM) (1.62 [1.50-2.28] vs 1.52 [1.49-1.55] a.u., P = .05 for ACE2 and 1.68 [1.66-1.78] vs 1.66 [1.63-1.69] a.u., P < .05 for ADAM17). Logistic regression analysis determined that T2DM was the main associated factor with epicardial ACE2 levels (P < .01). The highest ACE2 levels were found on patients with diabetes and obesity. ACE1 and ACE2 levels were not upregulated by antidiabetic treatment (metformin, insulin or thiazolidinedione). Its cellular levels, which were higher in epicardial than in subcutaneous stromal cells (1.61 [1.55-1.63] vs 1 [1-1.34]), were not correlated with the soluble ACE2. CONCLUSION:Epicardial fat cells expressed higher levels of ACE2 in comparison with subcutaneous fat cells, which is enhanced by diabetes and obesity presence in patients with cardiovascular disease. Both might be risk factors for SARS-CoV-2 infection.
journal_name
Eur J Clin Investjournal_title
European journal of clinical investigationauthors
Couselo-Seijas M,Almengló C,M Agra-Bermejo R,Luis Fernandez Á,Alvarez E,R González-Juanatey J,Eiras Sdoi
10.1111/eci.13463subject
Has Abstractpub_date
2020-11-29 00:00:00pages
e13463eissn
0014-2972issn
1365-2362pub_type
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journal_title:European journal of clinical investigation
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