Polybrominated diphenyl ethers and sperm quality.

Area of Science:

• Environmental Health
• Reproductive Toxicology
• Endocrinology

Background:

• Polybrominated diphenyl ethers (PBDE) are recognized endocrine disruptors with potential adverse effects on male reproduction.
• Persistent organic pollutants, including PBDEs, polychlorinated biphenyls (PCBs), and p,p'-DDE, are environmental contaminants of concern.

Purpose of the Study:

• To investigate the relationship between serum levels of PBDEs, PCBs, and p,p'-DDE and semen parameters in adult men.
• To examine the association between these environmental chemicals and serum thyroid hormone levels.

Main Methods:

• A cohort of 52 men attending a fertility clinic was recruited.
• Semen parameters, serum thyroid hormones (T3, T4, TSH), and serum levels of PBDEs, PCBs, and p,p'-DDE were measured.
• Sociodemographic and medical data were collected via questionnaires and medical records.

Main Results:

• Semen mobility showed a negative correlation with specific PBDE congeners (BDE-47, BDE-100) and the sum of PBDEs (ΣBDE).
• Thyroxin (T4) levels were negatively associated with serum BDE-47, BDE-99, ΣBDE, and p,p'-DDE, and positively associated with ΣPCB.
• No significant associations were found between other semen parameters, T3, TSH, and the measured environmental chemicals.

Conclusions:

• The findings contribute to the evidence suggesting that PBDEs may adversely affect semen quality.
• Exposure to PBDEs may also be linked to alterations in thyroid hormone status in the general population.