Abstract
Di (2-ethyl-hexyl) phthalate (DEHP) mainly enters the human body through the digestive tract, respiratory tract, and skin. At the same time, it has reproductive and developmental toxicity, neurotoxicity, and so on, which can cause the decrease of sperm motility. Asthenospermia is also known as low sperm motility, and the semen quality of men in some areas of China is declining year by year. Interestingly, previous studies have shown that sleep disorders can also lead to asthenospermia. However, the relationship between sleep, DEHP, and asthenospermia is still unclear. Analysis of the National Health and Nutrition Examination Survey (NHANES) population database showed that DEHP was associated with sleep disorders, and subsequent experiments in mice and Drosophila indicated that DEHP exposure had certain effects on sleep and asthenospermia. Furthermore, we analyzed the Comparative Toxicogenomics Database (CTD) to find out the common signaling pathway among the three: hypoxia-inducible factor 1(HIF-1). Then Search Tool for the Retrieval of Interacting Genes/Proteins (STRING) was used to screen out the proteins that DEHP affected the HIF-1 pathway: glyceraldehyde-3-phosphate dehydrogenase (GAPDH), serine/threonine-protein kinase (AKT1), epidermal growth factor receptor (EGFR), and finally Western blot analysis was used to detect the expression levels of the three proteins. Compared with the control group, DEHP decreased the protein expression levels of GAPDH and AKT1 in the HIF-1 pathway, and caused sleep disorders and decreased sperm motility. This study provides preliminary evidence for exploring the mechanism among DEHP, sleep disorders, and asthenospermia.
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The data are available from the corresponding author on reasonable request.
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Acknowledgements
We extend our sincere gratitude to Wenwen Wang from the Cancer Center of Zhejiang University for her guidance in bioinformatics, along with other study participants.
Funding
This work was supported by the National Natural Science Foundation of China [82073593], the Scientific Research Projects in Colleges and Universities of Anhui Education Department [KJ2019A0281 and KJ2020A0666], Domestic Visiting and Training Project for Excellent Young Key Teachers of Colleges and Universities [gxgnfx2020115], Research level improvement program of Anhui Medical University[2021xkjT010], National College Students Innovation and Entrepreneurship Project [202210366028], and National College Students Innovation and Entrepreneurship Project [S202310366113].
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Xiao-lu Li: project administration, investigation, formal analysis, writing—original draft, and writing—editing. Xiao-yue Cai: project administration, investigation, formal analysis, and writing—review. Xia Ning: methodology, visualization, and writing—review. Yue-yue Liang: methodology. Yun Hong: methodology. Qi-meng Li: methodology. Die Hu: methodology. Yuan-zhuo Zheng: methodology. Yang Cai: methodology. Wenwen Wang: methodology. Tao Xu: conceptualization, project administration, supervision, and funding acquisition. Ling-li Zhao: conceptualization, project administration, writing—review and editing, supervision, and funding acquisition.
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Eight-week-old ICR male mice were treated with DEHP (0 and 500 mg/kg/ day) by oral gavage for 35 days, and sperm motility in the cauda epididymidis was measured using a sperm motility analyzer. The video is a sperm motility video of the tail of the mouse epididymis.
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Li, Xl., Cai, Xy., Ning, X. et al. Role of sleep in asthenospermia induced by di (2-ethyl-hexyl) phthalate. Environ Sci Pollut Res 31, 13965–13980 (2024). https://doi.org/10.1007/s11356-024-32030-9
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DOI: https://doi.org/10.1007/s11356-024-32030-9