Mechanisms of Polystyrene Microplastics in Multipathway Disruption of the Blood-Testis Barrier
Abstract
Background: Polystyrene microplastics (PS-MPs) represent an emerging environmental pollutant, yet their potential threat to male reproductive health, specifically the integrity of the blood-testicular barrier (BTB), remains incompletely understood.
Objective: This study aimed to investigate the toxicological effects and underlying mechanisms of PS-MPs exposure on testicular structure and BTB function in a mouse model.
Methods: Four-week-old male ICR mice were exposed to PS-MPs at concentrations of 0, 500 µg/L, 5 mg/L, and 50 mg/L via drinking water for up to 5 weeks. Animals (n = 10 per group per time point) were sacrificed at weeks 1, 2, 3, 4, and 5 after initiation of exposure. A comprehensive assessment was performed, including evaluation of BTB permeability via biotin tracing, analysis of key junction protein (Connexin43, ZO-1, Occludin) expression and localization using western blot (WB), real-time quantitative polymerase chain reaction (RT-qPCR), and immunofluorescence, and immunofluorescent detection of macrophage activation (IBA-1).
Results: PS-MPs exposure significantly increased BTB permeability in a dose- and time-dependent manner. This was accompanied by a marked downregulation in the expression and disrupted localization of Connexin43, ZO-1, and Occludin. We observed an upregulation of IBA-1 within the testis, indicating macrophage activation.
Conclusion: This study demonstrates that PS-MPs induce BTB dysfunction in association with multipathway responses.…
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