4-methylimidazole exposure impairs sperm mobility by reducing the expression of blood-testis barrier junction protein in mouse testes

Area of Science:

• Toxicology
• Reproductive Biology
• Food Science

Background:

• 4-methylimidazole (4-MI) is a common additive in caramel-colored foods and beverages.
• Potential impacts of 4-MI on male reproductive health are not fully understood.

Purpose of the Study:

• To investigate the effects of 4-MI exposure on male reproductive function in mice.
• To elucidate the mechanisms underlying 4-MI-induced reproductive toxicity.

Main Methods:

• Mice were exposed to 4-MI for 8 weeks.
• Evaluated body and testicular weights, testicular morphology, sperm motility, and in vivo fertilization.
• Assessed blood-testis barrier integrity, Sertoli cell apoptosis, and oxidative stress markers.

Main Results:

• 4-MI exposure did not significantly affect body or testicular weight.
• Observed irregular testicular cell arrangement, reduced sperm motility, and decreased fertilization ability.
• Demonstrated disruption of blood-testis barrier integrity and increased Sertoli cell apoptosis, potentially due to oxidative stress.

Conclusions:

• 4-MI exposure negatively impacts male reproductive parameters, particularly sperm motility.
• Disruption of blood-testis barrier integrity is a key mechanism in 4-MI-induced reproductive damage.
• Oxidative stress may contribute to Sertoli cell apoptosis and subsequent male reproductive dysfunction.