What question did this study set out to answer?

This study aims to explore the role of ER stress in DEHP-mediated reproductive toxicity and the protective effects of 4-PBA.

May 25, 2026Open Access

Pharmacological Attenuation of Endoplasmic Reticulum Stress Restores Sexual Behavior and Spermatogenesis in DEHP‐Exposed Male Wistar Rats

Key Points

This study aims to explore the role of ER stress in DEHP-mediated reproductive toxicity and the protective effects of 4-PBA.
Male Wistar rats were divided into experimental groups (n=8), receiving vehicle, DEHP, and DEHP + 4-PBA.
DEHP was administered at 500 mg/kg for 28 days, while 4-PBA was given at 500 mg/kg and 1000 mg/kg for 14 days.
Biochemical and histopathological analyses were conducted to assess reproductive functions and testicular health.
DEHP exposure caused significant impairments in sexual behavior, increased oxidative-nitrosative stress, and sperm abnormalities.
Histopathological examination revealed spermatogenesis anomalies and loss of germ cells in DEHP-exposed rats.
Treatment with 4-PBA restored sexual behavior, improved testicular health, and suppressed DEHP-induced ER stress.

Abstract

Di-(2-ethylhexyl)phthalate (DEHP) is a plasticizer commonly used in the manufacture of polyvinyl chloride (PVC) products in household items and medical devices. Recent evidence demonstrated the detrimental effects of DEHP on reproductive function. Endoplasmic reticulum (ER) stress and its associated cell death in testes play a critical role in the pathophysiology of DEHP-mediated reproductive toxicity. Considering this, the present study aimed to explore and validate the role of ER stress using 4-phenylbutyric acid (4-PBA), an ER stress inhibitor, in DEHP-mediated reproductive toxicity in male Wistar rats. Rats were divided into different experimental groups (n = 8) and treated with vehicle (corn oil, p.o.), DEHP (500 mg/kg; p.o.), DEHP + 4-PBA (500 mg/kg; p.o.), and DEHP + 4-PBA (1000 mg/kg; p.o.). DEHP and 4-PBA were administered in different experimental groups for 28 and 14 days, respectively. Results showed that DEHP exposure impaired the sexual and copulatory behavior of male rats. Biochemical analysis revealed that DEHP raised the oxidative-nitrosative stress markers along with depletion of GSH in testes. Scanning electron microscopy (SEM) analysis revealed sperm abnormalities and cellular anomalies in testicular ultrastructure in the DEHP-exposed group. In addition, histopathological examination found spermatogenesis anomalies and loss of germ cells in the DEHP-exposed group. At the molecular level, the expression of ER stress-associated proteins, such as GRP78, CHOP, and caspase-12, in DEHP-exposed testes highlights the role of ER stress. Furthermore, the impact of ER stress on DEHP-mediated reproductive deficits was further validated by the administration of 4-PBA. Results found that 4-PBA restored the sexual behavior, testicular anomalies, and testosterone level in DEHP-treated rats. In addition, 4-PBA suppressed DEHP-induced ER stress and associated cellular atrophy in the spermatogenesis process in testicular tissue. These findings concluded that ER stress plays an important role in DEHP-mediated reproductive toxicity, and 4-PBA shows the reproprotective effects via inhibiting the ER stress signaling pathway.

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