Maternal Bisphenol S Exposure Impairs Testicular Development and Sperm Function in Male Offspring by Disrupting the Immune‐Endocrine Network

Why It Matters

The research uncovers a previously unknown pathway by which BPS jeopardizes male fertility across generations, raising urgent concerns for regulators and consumers about the safety of BPA alternatives.

Key Takeaways

• Gestational BPS exposure reduces Leydig cell population in mouse testes.
• Immune pathways, especially antigen presentation, become overactive after BPS exposure.
• Steroidogenic gene expression is suppressed, impairing testosterone synthesis.
• Sperm motility and seminiferous cycle are markedly compromised.
• Findings highlight transgenerational reproductive risk of BPS, a BPA substitute.

Pulse Analysis

Bisphenol S has rapidly replaced bisphenol A in plastics, thermal paper, and food packaging, driven by regulatory bans on BPA’s estrogenic activity. Yet BPS retains endocrine‑disrupting properties and is now detectable in human urine worldwide. The surge in its use has outpaced toxicological evaluation, prompting scientists to probe its long‑term health effects, especially on reproductive systems that are highly sensitive to hormonal cues.

In the latest preclinical investigation, pregnant mice received BPS doses mirroring human exposure levels. Multi‑omics profiling showed a pronounced shift in the testicular transcriptome: immune‑related genes such as H2‑D1 and Tlr1 were up‑regulated, while key steroidogenic enzymes were down‑regulated. Deconvolution of cell populations confirmed Leydig cell loss and increased T‑cell infiltration, indicating an inflammatory milieu that interferes with testosterone production. The downstream impact manifested as disrupted seminiferous epithelium, excess collagen deposition, and a 40% drop in sperm motility, underscoring a clear functional deficit.

These results have immediate implications for public health policy and consumer safety. Regulators may need to reassess the “safe” status of BPS, incorporating its capacity to alter immune‑endocrine crosstalk and affect future generations. For manufacturers, the study adds pressure to seek truly inert alternatives rather than simply swapping one bisphenol for another. Meanwhile, clinicians and fertility specialists should stay informed about environmental contributors to male subfertility, as emerging data suggest that prenatal chemical exposures could be a hidden factor behind declining sperm quality worldwide.