Prenatal phthalate exposure and reproductive function in young men.

Area of Science:

• Reproductive Toxicology
• Environmental Health
• Endocrinology

Background:

• Prenatal exposure to phthalates is a growing concern for male reproductive health.
• Limited human data exist on the specific impacts of diethylhexyl phthalate (DEHP) and diisononyl phthalate (DiNP).

Purpose of the Study:

• To investigate the association between prenatal exposure to DEHP and DiNP metabolites and reproductive parameters in adolescent men.
• To provide human data on the potential adverse effects of these common phthalates.

Main Methods:

• Maternal serum phthalate metabolite levels were measured during early pregnancy.
• Reproductive parameters including testicular size, semen quality, and hormone levels were assessed in 112 adolescent sons.
• Linear regression models were used to analyze associations, adjusting for confounders.

Main Results:

• Higher prenatal exposure to a DiNP metabolite was associated with significantly lower total testicular volume and semen volume, and higher follicle-stimulating hormone levels.
• Higher prenatal exposure to a DEHP metabolite was linked to lower semen volume.
• Specific DiNP metabolites showed linear associations with luteinizing hormone levels.

Conclusions:

• Prenatal exposure to certain DEHP and DiNP metabolites may negatively impact male reproductive function during adolescence.
• These findings highlight the potential risks of phthalate exposure during critical developmental windows.