Impact of Polystyrene Microplastic Exposure at Low Doses on Male Fertility: An Experimental Study in Rats

Scout Impact

Polystyrene microplastics (PS-MPs) are shown to cause significant reproductive harm in male rats, including reduced sperm quality and hormonal imbalances. This study confirms that PS-MPs induce oxidative stress and inflammation, leading to testicular damage. Scout penalizes products containing microplastics due to their confirmed reproductive toxicity.

Key Findings

• Finding 1: PS-MP exposure reduced sperm count and motility by significant margins.
• Finding 2: Testosterone levels decreased while FSH and LH levels increased in exposed rats.
• Finding 3: Mitochondrial markers PGC-1α, UCP1, and TFAM were downregulated.
• Finding 4: Inflammatory markers NF-κB, caspase-3, and TBARS were elevated, with antioxidant defenses significantly depleted.
• Finding 5: Dose-dependent effects were observed, with PS-MPs detected in testicular tissue at doses of 10 μg/kg and higher.

Limitations

• Limitation 1: The study was conducted on rats, which may limit direct applicability to humans.
• Limitation 2: The exposure duration was limited to 45 days, which may not reflect long-term effects.