Study by Chongqing Medical University Reveals the Potential Threat of Microplastics to the Male Reproductive System: Mechanism Analysis and Health Implications
2025-11-06 10:23
10 月 19 日，重庆医科大学发布的一项重磅研究，让 “微塑料污染” 从环境话题变成了每个人的健康警报 ——在收集的男性精液样本中，55.5% 都检出了微塑料颗粒！
On October 19, 2025, a research team from Chongqing Medical University published their findings in a journal focusing on reproductive health, which for the first time clearly identified the presence of microplastics in the human reproductive system and their associated hazards. Specifically, microplastic particles were detected in 55.5% of male semen samples, and the sperm concentration of individuals who frequently used plastic tableware was 33.23% lower than that of the control group. This reduction has approached the threshold for male fertility risk as defined by the World Health Organization (WHO).
The study further identified polystyrene (PS) and polyvinyl chloride (PVC) as the primary risk carriers. PS is commonly found in disposable foam food containers and food packaging trays, while PVC is widely used in plastic wrap and disposable tableware. Microplastic particles released by both materials can enter the bloodstream through the digestive tract and eventually penetrate the blood-testis barrier, exerting a targeted impact on the reproductive system.
Scientific Mechanism: The Signal Pathway by Which Microplastics Trigger Germ Cell Apoptosis
Through verification via cell experiments and animal models, the research team revealed the molecular mechanism by which microplastics impair reproductive function:
After polystyrene (PS)/polyvinyl chloride (PVC) microplastic particles enter germ cells, they specifically activate the FOXA1/MAP3K1/p38 signaling pathway. Among these components, FOXA1 acts as a transcription factor that regulates the expression of downstream MAP3K1 kinase, which in turn activates the p38 mitogen-activated protein kinase, ultimately initiating the apoptotic program of germ cells.
Abnormal activation of this pathway leads to impaired proliferation of spermatogonia and abnormal differentiation of secondary spermatocytes, directly resulting in reduced sperm count and decreased motility. Furthermore, this damage is cumulative, and long-term exposure can cause irreversible impairment to reproductive function.
This finding fills a gap in research on the human toxicity of microplastics. Previously, the academic community had detected microplastics in tissues such as blood, placenta, and lungs, but this is the first study to focus on the targeted hazards of microplastics to the reproductive system. It provides crucial experimental evidence for the health risk assessment of microplastics.
Scientific Basis for Material Selection
Priority should be given to materials with higher stability, such as polypropylene (PP5) and high-density polyethylene (HDPE). The microplastic release of these materials is only 1/8 that of polystyrene (PS) and 1/12 that of polyvinyl chloride (PVC), with superior high-temperature resistance.
Upgrade of Industry Standards
It is proposed to refer to EU regulations, establish detection methods and limit standards for microplastic release from disposable plastic tableware, and prohibit the use of PVC materials in food-contact applications.
Rational Guidance for Consumers
Efforts should be made to facilitate catering enterprises to adopt degradable alternative materials (e.g., polylactic acid, PLA). Meanwhile, popular science education for consumers should be strengthened to reduce high-frequency usage scenarios of "ready-to-eat food + plastic tableware".
Extension of Research Directions
In subsequent studies, it is necessary to further investigate the differences in reproductive toxicity of microplastics with different particle sizes and materials, as well as the synergistic effects between microplastics and other environmental pollutants (e.g., heavy metals, pesticide residues), so as to provide more precise scientific support for risk prevention and control.
Academic Value of the Study
This study not only provides a new target for the assessment of microplastics' human health risks but also advances research progress in the cross-disciplinary field of "environmental pollutants - reproductive health". From a social perspective, it also offers a health-dimensional basis for the deepening of plastic restriction policies. Currently, global plastic restriction initiatives mostly focus on environmental governance; however, the research by Chongqing Medical University suggests that the health hazards of microplastics have become a key driving force for promoting plastic pollution governance, and it is necessary to construct a governance system from the dual dimensions of "environmental protection" and "public health".
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