Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 406, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124308
Keywords
Ambient air pollutants; Semen quality; MtDNAcn; STL; Seminal spermatogenic cells
Categories
Funding
- Natural Science Foundation of China [91643108, 81973074, 81573190]
- State Key Laboratory of Reproductive Medicine Program [SKLRM-K201907]
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The study found that exposure to CO and PM may impair testicular and post-testicular semen quality, while changes in seminal spermatogenic cells, sperm telomere length, and sperm mitochondrial DNA copy number indicate the need for more attention to these mechanisms.
Evidences on the association of air pollutants and semen quality were limited and mechanism-based biomarkers were sparse. We enrolled 423 men at a fertility clinic in Shijiazhuang, China to evaluate associations between air pollutants and semen quality parameters including the conventional ones, sperm mitochondrial DNA copy number (mtDNAcn), sperm telomere length (STL) and seminal spermatogenic cells. PM2.5, PM10, CO, SO2, NO2 and O-3 exposure during lag0-90, lag0-9, lag10-14 and lag70-90 days were evaluated with ordinary Kringing model. The exposure-response correlations were analyzed with multiple linear regression models. CO, PM2.5 and PM10 were adversely associated with conventional semen parameters including sperm count, motility and morphology. Besides, CO was positively associated with seminal primary spermatocyte (lag70-90, 0.49; 0.14, 0.85) and mtDNAcn (lag0-90, 0.37; 0.12, 0.62, lag10-14, 0.31; 0.12, 0.49), negatively associated with STL (lag0-9, -0.30; -0.57, -0.03). PM2.5 was positively associated with mtDNAcn (0.50; 0.24, 0.75 and 0.38; 0.02, 0.75 for lag0-90 and lag70-90) while negatively associated with STL (lag70-90, -0.49; -0.96, -0.01). PM10 and NO2 were positively associated with mtDNAcn. Our findings indicate CO and PM might impair semen quality testicularly and post-testicularly while seminal spermatogenic cell, STL and mtDNAcn change indicate necessity for more attention on these mechanisms.
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