Objectives
To examine the hypothesis that insulin resistance (IR) decreases circulating concentrations of NT-pro brain natriuretic peptide (BNP).
Background
Obesity, despite being a risk factor for heart failure (HF), is paradoxically associated with lower concentrations of BNP, a marker of myocardial stress. Low BNP in obesity is postulated to be due to IR; however, it has been difficult to define the role of IR independent of obesity. IR in rheumatoid arthritis (RA) is increased, independent of obesity, thus allowing potential mechanistic insights into the relationship between IR and BNP.
Methods
We measured demographic factors, traditional cardiovascular risk factors, body mass index (BMI), markers of inflammation (interleukin-6 (IL-6), C-reactive protein (CRP), tumor necrosis factor α (TNFα)), NT-pro-BNP, and IR by the homeostatic model assessment (HOMA) in 140 patients with RA and 82 control subjects. Patients with heart failure and coronary artery disease were excluded. We used multiple linear regression models to examine the relationship between HOMA and NT-pro-BNP in RA and controls, and in RA alone, the additional effect of inflammation.
Results
As previously reported, NT-pro-BNP concentrations were higher in RA (median 80.49 pg/mL, IQR (23.67–167.08 pg/mL) than controls (17.84 pg/mL (3.28–36.28 pg/mL)) (P<0.001), and the prevalence of IR, defined by HOMA>2.114, was higher among RA than controls (53% vs. 15%, P>0.001). HOMA was positively correlated with NT-pro-BNP (rho=0.226, P=0.007) in RA, but not in controls (rho=−0.154, P=0.168). In a multivariable model adjusted for age, race and sex, we found that increasing HOMA was statistically associated with increasing NT-pro-BNP concentrations in RA (P=0.001), but not controls (P=0.543) (P for interaction = 0.036). In RA subjects, when IL-6 was further included in the model, IL-6 (P=0.0014), but not HOMA (P=0.43), remained significantly associated with NT-pro-BNP, suggesting that IL-6 may be mechanistically involved in the relationship between IR and NT-pro-BNP in RA.
Conclusions
We conclude that in patients with RA, insulin resistance is associated with higher, rather than the expected lower, concentrations of NT-pro-BNP and that this may be related to increased IL-6.