Human urinary phthalate metabolites level and main semen parameters, sperm chromatin structure, sperm aneuploidy and reproductive hormones.
Level 4 - case-series / case-control
Cross-sectional observational study assessing biomarker associations
PubMed 24140385 · doi:10.1016/j.reprotox.2013.10.001
What was done
The study evaluated the relationship between urinary phthalate metabolite concentrations and male reproductive parameters in 269 men attending an infertility clinic. Participants had normal sperm concentrations (20-300 million/mL) or slight oligozoospermia (15-20 million/mL). Urinary phthalate metabolites were measured using liquid chromatography-tandem mass spectrometry (LC-MS/MS). Assessed outcomes included standard semen parameters (concentration, motility, morphology), computer-assisted sperm analysis (CASA) parameters, sperm chromatin structure (DNA damage), sperm aneuploidy, and reproductive hormones.
What was found
The abstract reports statistical significance without providing numeric effect sizes, point estimates, or p-values: - Significant association with decreased sperm motility: 5OH-MEHP, MEHP, and MINP. - Significant association with decreased CASA parameters: MBP. - Significant association with decreased testosterone level: MEHP. - Significant association with increased sperm DNA damage: MBP. - Significant association with increased sperm aneuploidy: MBzP, MBP, MEHP, and MEP.
Why it matters
This study links environmental phthalate exposure to multiple markers of male reproductive dysfunction, including chromosomal abnormalities and sperm DNA damage, in a clinical population.
Limits
The study is cross-sectional, precluding causal inference. The abstract reports no numerical values, effect sizes, or confidence intervals. Findings from men attending an infertility clinic may not generalize to the broader population, and spot urine samples may not capture long-term phthalate exposure over the duration of spermatogenesis.
Cited by
- supports Elevated phthalate levels in adult men are linked to lower sperm quality and decreased testosterone.