Racial/ethnic differences in circulating natriuretic peptide levels: The Diabetes Prevention Program

Area of Science:

• Cardiovascular Endocrinology
• Metabolic Disease Research
• Clinical Trial Analysis

Background:

• Natriuretic peptides are key hormones influencing insulin sensitivity and fat metabolism.
• Low natriuretic peptide levels are linked to an increased risk of type 2 diabetes mellitus (DM2).
• Racial and ethnic disparities exist in DM2 prevalence, yet differences in natriuretic peptide levels and responses to interventions remain understudied.

Purpose of the Study:

• To investigate racial and ethnic variations in N-terminus pro-B-type natriuretic peptide (NT-proBNP) levels.
• To examine how race/ethnicity influences NT-proBNP concentrations at baseline and after DM2 preventive interventions.
• To analyze the response of NT-proBNP levels to placebo, lifestyle changes, and metformin across different racial/ethnic groups.

Main Methods:

• Analysis of serum samples from 3,220 participants in the Diabetes Prevention Program (DPP) trial.
• Measurement of N-terminus pro-B-type natriuretic peptide (NT-proBNP) at baseline and after two years of intervention.
• Application of multivariable-adjusted regression to assess the impact of race/ethnicity on NT-proBNP levels.

Main Results:

• Significant racial differences in baseline NT-proBNP levels were observed (P < .001).
• African-American and Hispanic individuals exhibited lower baseline NT-proBNP compared to white individuals.
• NT-proBNP levels decreased in African-Americans across all intervention arms, while remaining stable or increasing in other groups over two years.

Conclusions:

• African-American individuals demonstrated lower circulating NT-proBNP levels compared to other racial/ethnic groups at baseline and post-intervention.
• These findings highlight potential racial/ethnic differences in natriuretic peptide physiology relevant to DM2.
• Further research is warranted to explore the cardio-metabolic implications of these disparities in African-Americans.