Effects of Endocrine-Disrupting Chemicals on Adrenal Function

The adrenal glands play crucial roles in regulating metabolism, blood pressure, immune system function, and response to stress through the secretion of hormones. Despite their critical functions, the adrenal glands are often overlooked in studies on the effects of potential toxicants. Research across human, animal, and in vitro studies has identified more than 60 compounds that can induce adrenocortical toxicity. These compounds, known as endocrine-disrupting chemicals (EDCs), are natural or synthetic substances that interfere with the endocrine system. This review aims to provide an overview of the effects of 4 major families of EDCs-flame retardants, bisphenols, phthalates, and microplastics-on the function of the adrenal glands. The PubMed database was searched for studies reporting the effects of the chemicals in these 4 families on the adrenal glands. There is clear evidence that the morphology and function of the adrenal gland are affected, particularly through disrupting the steroidogenic pathway. Additionally, some EDCs have been shown to exert transgenerational effects, raising further concerns about their long-term effect. However, most EDCs have not been thoroughly evaluated for their effects on the function of the adrenal glands, especially in human studies. Thus, developing regulatory testing guideline to include the adrenal glands in the screening of EDCs is urgently needed.