Abstract
The majority of epidemiological investigations on metal exposures and lipid metabolism employed cross-sectional designs and focused on individual metal. We explored the associations between metal mixture exposures and longitudinal changes in lipid profiles and potential sexual heterogeneity. We recruited 250 men and 73 women, aged 40 years at baseline (2012), and followed them up in 2020, from the manganese-exposed workers healthy cohort. We detected metal concentrations of blood cells at baseline with inductively coupled plasma mass spectrometry. Lipid profiles were repeatedly measured over 8 years of follow-up. We performed sparse partial least squares (sPLS) model to evaluate multi-pollutant associations. Bayesian kernel machine regression was utilized for metal mixtures as well as evaluating their joint impacts on lipid changes. In sPLS models, a positive association was found between manganese and change in total cholesterol (TC) (beta = 0.169), while a negative association was observed between cobalt (beta = − 0.134) and change in low density lipoprotein cholesterol (LDL-C) (beta = − 0.178) among overall participants, which were consistent in men. Interestingly, rubidium was positively associated with change in LDL-C (beta = 0.273) in women, while copper was negatively associated with change in TC (beta = − 0.359) and LDL-C (beta = − 0.267). Magnesium was negatively associated with change in TC (beta = − 0.327). We did not observe the significantly cumulative effect of metal mixtures on lipid changes. In comparison to other metals, manganese had a more significant influence on lipid change [group PIP (0.579) and conditional PIP (0.556) for TC change in men]. Furthermore, male rats exposed to manganese (20 mg/kg) had higher levels of LDL-C in plasma and more apparent inflammatory infiltration, vacuolation of liver cells, nuclear pyknosis, and fatty change than the controls. These findings highlight the potential role of metal mixtures in lipid metabolism with sex-dependent heterogeneity. More researches are needed to explore the underlying mechanisms.
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Data availability
The datasets used or analyzed and materials during the current study are available from the corresponding author on reasonable request.
Abbreviations
- MEWHC:
-
Manganese-exposed workers healthy cohort
- ICP-MS:
-
Inductively coupled plasma mass spectrometry
- sPLS:
-
Sparse partial least squares
- BKMR:
-
Bayesian kernel machine regression
- TC:
-
Total cholesterol
- TG:
-
Triglycerides
- HDL-C:
-
High-density lipoprotein cholesterol
- LDL-C:
-
Low-density lipoprotein cholesterol
- LOD:
-
Limit of detection
- ICC:
-
Intraclass correlation coefficient
- BMI:
-
Body mass index
- OLS:
-
Ordinary least squares
- PIP:
-
Posterior inclusion probabilities
- Mg:
-
Magnesium
- Mn:
-
Manganese
- Fe:
-
Iron
- Co:
-
Cobalt
- Cu:
-
Copper
- Zn:
-
Zinc
- Se:
-
Selenium
- Rb:
-
Rubidium
- Cd:
-
Cadmium
- Pb:
-
Lead
- ROS:
-
Reactive oxygen species
- SHBG:
-
Sex hormone-binding globulin
- ERRα:
-
Estrogen-related receptor alpha
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Acknowledgements
We would like to thank all participants who volunteered to take part in this study and all researchers involved in the project.
Funding
This work was funded by the National Natural Science Foundation of China (U21A20340, 82073504) and Guangxi Natural Science Fund for Innovation Research Team (2017GXNSFGA198003).
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Xiaoting Ge: Writing, original draft; writing, review and editing. Guohong Ye: Writing, original draft; writing, review and editing. Junxiu He: Conceptualization, writing—review and editing. Yu Bao: Investigation, data curation. Yuan Zheng: Investigation, data curation. Hong Cheng: Methodology. Xiuming Feng: Investigation, data curation. Wenjun Yang: Investigation, data curation. Fei Wang: Writing—review and editing. Yunfeng Zou: Conceptualization. Xiaobo Yang: Supervision, project administration.
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Ge, X., Ye, G., He, J. et al. Metal mixtures with longitudinal changes in lipid profiles: findings from the manganese-exposed workers healthy cohort. Environ Sci Pollut Res 29, 85103–85113 (2022). https://doi.org/10.1007/s11356-022-21653-5
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DOI: https://doi.org/10.1007/s11356-022-21653-5