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Particulate matter and markers of glycemic control and insulin resistance in type 2 diabetic patients: result from Wellcome Trust Genetic study

Abstract

There is growing evidence that air pollution is associated with increased risk of type 2 diabetes (T2DM). However, information related to whether particulate matter (PM) contributing to worsened metabolic control in T2DM patients is inconsistent. We examined the association of PM10 exposure with glucose-function parameters in young-onset T2DM patients. We investigated the association between a year ambient concentration of PM10 at residential places, using AERMOD dispersion model, with fasting plasma glucose (FPG), hemoglobin A1c (HbA1c), 2 h post meal plasma glucose (2hPG), homeostasis model assessment of insulin resistance (HOMA-IR), β-cell function (HOMA-β) and disposition index (DI) in 1213 diabetic patients from the Wellcome Trust Genetic study at the Diabetes Unit, KEM Hospital Research Center, Pune, India. We used linear regression models and adjusted for a variety of individual and environmental confounding variables. Possible effect modification by age, gender, waist-to-hip ratio (WHR) and smoking status were investigated. Sensitivity analysis assessed the impact of relative humidity (RH) and temperature a day before examination and anti-diabetic and HHR medication (Hydralazine, Hydrochlorothiazide and Reserpine). We found that 1 SD increment in background concentration of PM10 at residential places (43.83 µg/m3) was significantly associated with 2.25 mmol/mol and 0.38 mmol/l increase in arithmetic means of HbA1c and 2hPG, respectively. A similar increase in PM10 was also associated with 4.89% increase in geometric mean of HOMA-IR. The associations remained significant after adjustment to RH and temperature, and WHR and smoking enhanced the size of the effect. Our study suggests that long-term exposure to PM10 is associated with higher glycaemia and insulin resistance. In context of our previous demonstration of association of SO2 and NO x and plasma C-reactive protein, we suggest that air pollution could influence progression of diabetes complications. Prospective studies and interventions are required to define mechanism and confirm causality.

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Fig. 1: Association between exposure to PM10 and biomarkers of glycemic control, HOMA-IR, HOMA-β and DI, adjusted to age, sex, season of enrolment, duration of diabetes, WHR, and smoking
Fig. 2: Association between exposure to PM10 and biomarkers of glycemic control (i.e., 2hPG, HbA1c) adjusted to age, sex, season of enrolment, duration of diabetes, WHR, and smoking
Fig. 3: Effect modification
Fig. 4: Effect modification
Fig. 5: Effect modification

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Acknowledgements

We acknowledge the contribution made by WellGen study group and Ms. Smita Kulkarni, Diabetes Unit, in data collection and data management, and Mr. Dattatray Bhat, Diabetes Unit, for laboratory measurements. Air pollutants and meteorological data were taken from Maharashtra Pollution Control Board and Meteorological Department, Pune Office, respectively. The WellGen study was supported by the Wellcome Trust (London, UK). None of the authors had any financial or personal conflicts of interest associated with this manuscript.

Author contributions

MAK and CSY researched, wrote, discussed and edited the manuscript. SSS and AO contributed to the discussion and edited the manuscript. BK and SDG contribute to the data analyses and edited the manuscript. CSY is the guarantor of this work and, as such, had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.

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Correspondence to Chittaranjan Sakerlal Yajnik.

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Khafaie, M.A., Salvi, S.S., Ojha, A. et al. Particulate matter and markers of glycemic control and insulin resistance in type 2 diabetic patients: result from Wellcome Trust Genetic study. J Expo Sci Environ Epidemiol 28, 328–336 (2018). https://doi.org/10.1038/s41370-017-0001-1

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