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    Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/2436


    Title: PCB126 induces differential changes in androgen, cortisol, and aldosterone biosynthesis in human adrenocortical H295R cells
    Authors: Li, LA;Wang, PW
    Contributors: Division of Environmental Health and Occupational Medicine
    Abstract: Dioxins and polychlorinated biphenyls (PCBs) have been shown to accumulate in the adrenal glands when incorporated into the body. However, the impacts of exposure on adrenal steroidogenesis have not been thoroughly investigated. In this study, we demonstrated that dioxin-like PCB126 altered androgen, cortisol, and aldosterone biosynthesis differentially in human adrenocortical H295R cells. PCB126 diminished basal and cAMP-induced androstenedione production as well as CYP17 mRNA expression in a dose-dependent and time-dependent manner. The CYP17 repression was accompanied with decreases in the encoded 17 alpha-hydroxylase and 17,20-lyase activities, particularly the latter. In contrast, high concentrations of PCB126 stimulated basal cortisol and aldosterone biosynthesis, including induction of CYP21B, CYP11B1, and CYP11B2 mRNA expression and elevation of the conversion of cortisol from 17-OH-progesterone and aldosterone from progesterone. cAMP abolished the positive effect of PCB126 on cortisol synthesis, while it synergistically enhanced PCB126 stimulation on CYP11B2 expression and aldosterone production. It seemed likely that the downregulation of CYP21B caused by the combination of PCB126 and cAMP counteracted the CYP11B1 induction stimulated by the co-treatment. In addition, high concentrations of PCB126 might sensitize the regulation of adrenocorticotropin (ACTH) on the adrenocortical cells by increasing ACTH receptor levels. Because adrenal steroids have profound influences on glucose tolerance, insulin sensitivity, lipid metabolism, obesity, vascular function, and cardiac remodeling, this article also discusses the potential association of the detected adrenocortical alterations with increased diabetic and cardiovascular risk found among highly exposed people.
    Keywords: Toxicology
    Date: 2005-05
    Relation: Toxicological Sciences. 2005 May;85(1):530-540.
    Link to: http://dx.doi.org/10.1093/toxsci/kfi105
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=1096-6080&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000228398000012
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=18144424027
    Appears in Collections:[李立安] 期刊論文

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