Journal Article

Plasma Trimethylamine-N-oxide and impaired glucose regulation: Results from The Oral Infections, Glucose Intolerance and Insulin Resistance Study (ORIGINS)

Roy, Sumith, Colombo, Paolo C., Nandakumar, Renu, Yuzefpolskaya, Melana, Demmer, Ryan T.

2020

Overview

Trimethylamine-N-oxide (TMAO)-a gut-microbiota metabolite-is a biomarker of cardiometabolic risk. No studies have investigated TMAO as an early biomarker of longitudinal glucose increase or prevalent impaired glucose regulation. In a longitudinal cohort study, 300 diabetes-free men and women (77%) aged 20-55 years (mean = 34±10) were enrolled at baseline and re-examined at 2-years to investigate the association between TMAO and biomarkers of diabetes risk. Plasma TMAO was measured using Ultra Performance Liquid Chromatography-Mass Spectrometry. After an overnight fast, FPG was measured longitudinally, HbA1C and insulin were measured only at baseline. Insulin resistance was defined using HOMA-IR. Multivariable generalized linear models regressed; i) FPG change (year 2 minus baseline) on baseline TMAO tertiles; and ii) HOMA-IR and HbA1c on TMAO tertiles. Multivariable relative risk regressions modeled prevalent prediabetes across TMAO tertiles. Mean values of 2-year longitudinal FPG±SE across tertiles of TMAO were 86.6±0.9, 86.7±0.9, 86.4±0.9 (p = 0.98). Trends were null for FPG, HbA1c, HOMA-IR, cross-sectionally. The prevalence ratio of prediabetes among participants in 2nd and 3rd TMAO tertiles (vs. the 1st) were 1.94 [95%CI 1.09-3.48] and 1.41 [95%CI: 0.76-2.61]. TMAO levels are associated with increased prevalence of prediabetes in a nonlinear fashion but not with insulin resistance or longitudinal FPG change.

• Publisher: Public Library of Science,Public Library of Science (PLoS)
• Subject: Adult / Age / Biology and Life Sciences / Biomarkers / Biomarkers - blood / Blood Glucose - analysis / Body mass index / Cardiology / Chromatography / Chronic illnesses / Cross-Sectional Studies / Diabetes / Diabetes mellitus / Diet / Epidemiology / Ethnicity / Female / Glucose / Glucose Intolerance - blood / Glucose Intolerance - pathology / Glucose tolerance / Glycated Hemoglobin A - analysis / Health risks / Heart attacks / Hemoglobin / Hispanic people / Hispanics / Humans / Insulin / Insulin - blood / Insulin Resistance / Intestinal microflora / Intolerance / Liquid chromatography / Longitudinal Studies / Male / Mass spectrometry / Mass spectroscopy / Medicine and Health Sciences / Metabolism / Metabolites / Methylamines - blood / Microbiota / Middle Aged / Physical Sciences / Prediabetic State - epidemiology / Prediabetic State - pathology / Prevalence / Public health / Risk / Risk Factors / Smoking / Statistical models / Studies / Trimethylamine / Trimethylamine-N-oxide / Variables / Young Adult