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Sci Rep. 2019 Nov 22;9(1):17423. doi: 10.1038/s41598-019-53716-y.

Air pollution-derived particulate matter dysregulates hepatic Krebs cycle, glucose and lipid metabolism in mice.

Author information

1
Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, 615N. Wolfe Street, Baltimore, MD, 21205, USA. hreyesc1@jhu.edu.
2
Cardiovascular Research Institute, Case Western Reserve School of Medicine, 11100 Euclid Avenue, Cleveland, OH, 44106, USA.
3
Department of Toxicology and Cancer Biology, Markey Cancer Center, Center for Environmental and Systems Biochemistry, University of Kentucky, 1095V.A. Drive, Lexington, KY, 40536, USA.
4
Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, 615N. Wolfe Street, Baltimore, MD, 21205, USA.
5
Public Health Center, Toxicology Directorate, Aberdeen Proving Ground, Aberdeen, MD, USA.
6
Department of Pharmacological Sciences, Stony Brook University, BST 8-140, Stony Brook, NY, 11794, USA.
7
Department of Pathology, Stony Brook University School of Medicine, Stony Brook, NY, 11794, USA.
8
Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, 615N. Wolfe Street, Baltimore, MD, 21205, USA. Sbiswal@jhu.edu.

Abstract

Exposure to ambient air particulate matter (PM2.5) is well established as a risk factor for cardiovascular and pulmonary disease. Both epidemiologic and controlled exposure studies in humans and animals have demonstrated an association between air pollution exposure and metabolic disorders such as diabetes. Given the central role of the liver in peripheral glucose homeostasis, we exposed mice to filtered air or PM2.5 for 16 weeks and examined its effect on hepatic metabolic pathways using stable isotope resolved metabolomics (SIRM) following a bolus of 13C6-glucose. Livers were analyzed for the incorporation of 13C into different metabolic pools by IC-FTMS or GC-MS. The relative abundance of 13C-glycolytic intermediates was reduced, suggesting attenuated glycolysis, a feature found in diabetes. Decreased 13C-Krebs cycle intermediates suggested that PM2.5 exposure led to a reduction in the Krebs cycle capacity. In contrast to decreased glycolysis, we observed an increase in the oxidative branch of the pentose phosphate pathway and 13C incorporations suggestive of enhanced capacity for the de novo synthesis of fatty acids. To our knowledge, this is one of the first studies to examine 13C6-glucose utilization in the liver following PM2.5 exposure, prior to the onset of insulin resistance (IR).

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