Objectives
To investigate the association between natriuretic peptides and body fat distribution in a multiethnic cohort.
Background
Natriuretic peptides stimulate lipolysis, reduce weight gain, and promote adipocyte browning in animal models but data are lacking in humans.
Methods
2619 participants without heart failure in the Dallas Heart Study underwent measurements of 1) B-type natriuretic peptide (BNP) and NT-proBNP and 2) body fat distribution by dual energy x-ray absorptiometry and magnetic resonance imaging. Cross-sectional associations of natriuretic peptides with adiposity phenotypes were examined after adjustment for age, sex, race, comorbidities, and body mass index.
Results
Median BNP and NT-proBNP levels in the study cohort (mean age 44 years, 56% women, 48% African-Americans, 32% obese) were 3.0 and 28.1 pg/mL, respectively. Natriuretic peptide levels above the median were associated with a more favorable body fat profile and less insulin resistance including lower visceral fat, liver fat, and HOMA-IR; and more lower body fat and higher adiponectin (p<0.05 for each). In multivariable analyses, NT-proBNP remained inversely associated with visceral (β= −0.08, p<0.0001) and liver fat (β= −0.14, p<0.0001) and positively associated with lower body fat (β= 0.07, p<0.0001) independent of age, sex, race, and obesity-status; findings were similar with BNP. Adjustment for body composition, HOMA-IR, circulating androgens, and adipocytokines did not attenuate the associations.
Conclusions
Higher natriuretic peptide levels were independently associated with a favorable adiposity profile, characterized by decreased visceral and liver fat and increased lower body fat, suggesting a link between the heart and adipose tissue distribution mediated through natriuretic peptides.