Abstract
Although the effect of the central clock system on adrenal function has been extensively studied, the role of the peripheral clock system in adrenal tumorigenesis remains largely unexplored. In this study we investigated the expression of clock-related genes in normal adrenocortical tissue and adrenocortical tumors. Twenty-seven fresh frozen human adrenal tissues including 13 cortisol secreting adenomas (CSA), seven aldosterone producing adenomas (APA), and seven adrenocortical carcinomas (ACC) were collected. CLOCK, BMAL1, PER1, CRY1, Rev-ERB, and RORα mRNA and protein expression were determined by qPCR and immunoblotting in pathological tissues and compared with the adjacent normal adrenal tissues. A significant downregulation of PER1, CRY1, and Rev-ERB compared with their normal tissue was demonstrated in CSA. All clock-related genes were overexpressed in APA compared with their normal tissue, albeit not significantly. A significant upregulation of CRY1 and PER1 and downregulation of BMAL1, RORα, and Rev-ERB compared with normal adrenal tissue was observed in ACC. BMAL1 and PER1 were significantly downregulated in APA compared with CSA. CLOCK, CRY1, and PER1 were upregulated, whereas BMAL1, RORα, and Rev-ERB were downregulat...Continue Reading
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