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Certain commonly used compounds that interfere with the functions of the endocrine system are classified as endocrine-disrupting chemicals (EDCs). Bisphenol A (BPA) is an EDC that is widely used in food containers. BPA levels in human sera are commonly observed to be approximately 1-100 nM. Compared with the effects of BPA on the gonads, its effects on the adrenal gland are poorly understood. To investigate the influence of BPA on steroidogenesis, we examined the activity of the steroidogenic gene Cyp11a1 and its regulatory pathways in mouse Y1 adrenal cortex cells. Treatment with BPA at &lt; 100 µM did not cause cell death. However, increased promoter activity and protein expression of Cyp11a1 were induced by low doses of BPA (10-1000 nM). Moreover, BPA induced c-Jun phosphorylation, and a specific inhibitor of c-Jun N-terminal kinase (JNK) significantly suppressed BPA-induced steroidogenesis. Thus, treatment of adrenal cells with low doses of BPA activated Cyp11a1 and increased corticosterone production through the JNK/c-Jun signaling pathway. Identical results were observed in rats after BPA injection. The abnormal induction of hormone synthesis by BPA in the adrenal gland might be linked to human metabolic defects and neuropsychiatric disorders.

Low-dose Bisphenol A ActivatesCyp11a1Gene Expression and Corticosterone Secretion in Adrenal Gland via the JNK Signaling Pathway