Renal function is independently associated with circulating betatrophin

Area of Science:

• Endocrinology
• Metabolic Syndrome Research
• Renal Physiology

Background:

• Betatrophin is a novel marker connecting liver and beta-cell function, and lipid metabolism, primarily studied in murine models.
• The regulation of circulating betatrophin in humans remains incompletely understood.
• This study investigates betatrophin's relationship with metabolic syndrome phenotypes and potential influences on its levels.

Purpose of the Study:

• To analyze the relationship between circulating betatrophin levels and various phenotypes of the metabolic syndrome in a human cohort.
• To explore the potential influence of renal function on circulating betatrophin levels.
• To investigate if renal function explains age-dependent changes in betatrophin.

Main Methods:

• Analysis of blood samples from 535 participants in the Metabolic Syndrome Berlin Potsdam study.
• Correlation analysis between betatrophin levels and clinical parameters including HbA1c, fasting glucose, triglycerides, age, blood pressure, and intima-media thickness.
• Multivariate linear regression analysis to assess the association of estimated glomerular filtration rate (eGFR) with betatrophin, adjusting for multiple covariates.

Main Results:

• Betatrophin levels positively correlated with HbA1c, fasting glucose, triglycerides, age, systolic blood pressure, and intima-media thickness.
• A significant negative correlation was observed between betatrophin and CKD-EPI eGFR, an indicator of renal function.
• Estimated GFR remained a significant independent predictor of betatrophin levels even after adjusting for age, waist circumference, gender, HbA1c, and lipid parameters.

Conclusions:

• Circulating betatrophin levels in humans are associated with age, gender, waist circumference, total/HDL cholesterol ratio, and importantly, renal function.
• The strong association with eGFR underscores the need to consider renal function as a potential confounder in studies of betatrophin.
• Future research should focus on the role of kidney function in regulating betatrophin and its implications for metabolic health.