Abstract
Introduction
Urbanization is associated with major changes in environmental and lifestyle exposures that may influence metabolic signatures.
Objectives
We investigated cross-sectional urban and rural differences in plasma metabolome analyzed by liquid chromatography/mass spectrometry platform in 500 Chinese adults aged 25–68 years from two neighboring southern Chinese provinces.
Methods
We first examined the overall metabolome differences by urban and rural residential location, using Orthogonal Partial Least Squares Discriminant Analysis (OPLS-DA) and random forest classification. We then tested the association between urbanization status and individual metabolites using a linear regression adjusting for age, sex, and province and conducted pathway analysis (Fisher’s exact test) to identify metabolic pathways differed by urbanization status.
Results
We observed distinct overall metabolome by urbanization status in OPLS-DA and random forest classification. Using linear regression, out of a total of 1108 unique metabolite features identified in this sample, we found that 266 metabolites were differed by urbanization status (positive false discovery rate-adjusted p-value, q-value < 0.05). For example, the following metabolites were positively associated with urbanization status: caffeine metabolites from xanthine metabolism, hazardous pollutants like 4-hydroxychlorothalonil and perfluorooctanesulfonate, and metabolites implicated in cardiometabolic diseases, such as branched-chain amino acids. In pathway analysis, we found that xanthine metabolism pathways differed by urbanization status (q-value = 1.64E−04).
Conclusion
We detected profound differences in host metabolites by urbanization status. Urban residents were characterized by metabolites signaling caffeine metabolism and toxic pollutants and metabolites on known pathways to cardiometabolic disease risks, compared to their rural counterparts. Our findings highlight the importance of considering urbanization in metabolomics analysis.
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Data availability
The metadata associated to the samples, including community-, household-, and individual-level data like urbanization index, household income, education, and physical activity, is publicly available at the China Health and Nutrition Survey (CHNS) website: https://www.cpc.unc.edu/projects/china. The metabolomics data analyzed during the current study are currently not publicly available, but are pending release to a public repository with an embargo in the future. Metabolomics data are available to collaborators by permission from the corresponding author.
Code availability
The code used for the current study are available upon reasonable request.
Consent to publish
Not applicable.
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Acknowledgements
We are grateful to the participants in the China Health and Nutrition Survey. We also want to thank Dr. Hsiao-Chuan Tien, Dr. Shufa Du, and Ms. Guifeng Jin for database assistance.
Funding
We are grateful to Research Grant funding from the National Institute for Health (NIH), National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) for R01DK104371. We are also grateful to the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) for R01 HD30880 and the NIH Fogarty Grant D43 TW009077 for financial support for the CHNS data collection and analysis files from 1989 to 2015 and future surveys. We thank the National Institute for Nutrition and Health, China Center for Disease Control and Prevention. We are also grateful for funding from the NICHD to Carolina Population Center at the University of North Carolina at Chapel Hill (NIH Grant P2C HD050924). We are also grateful to the National Center for Advancing Translational Sciences (NCATS), National Institutes of Health, through Grant Award Number UL1TR002489. Y.W. is grateful to the Sanofi Funding Award 29230-50347-466001 for educational support. M.C.B.T. is supported by Ruth L. Kirschstein National Research Service Awards (NRSA) Genetic Epidemiology of Heart, Lung, and Blood (HLB) Traits Training Grant (GenHLB, T32HL129982) funded by National Heart, Lung, and Blood Institute (NHLBI).
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HW, JZ, CS, ZW, and BZ: performed data collection. YW and WS: designed study, analyzed data, and wrote the paper. AGH, AAF and MCBT: supervised data analysis and provided intellectual content to revise the manuscript. PG-L: designed study and provided intellectual content to revise the manuscript. All authors read and approved the manuscript.
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The study met the standards for the ethical treatment of participants and was approved by the Institutional Review Boards of the University of North Carolina at Chapel Hill, Chinese Center for Disease Control and Prevention, and the National Institute for Nutrition and Health.
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Wang, Y., Sha, W., Wang, H. et al. Urbanization in China is associated with pronounced perturbation of plasma metabolites. Metabolomics 16, 103 (2020). https://doi.org/10.1007/s11306-020-01724-9
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DOI: https://doi.org/10.1007/s11306-020-01724-9