Abstract
The recently cloned cyclin-dependent kinase inhibitor gene p57KIP2 is genomically imprinted and located on human chromosome 11p15.5. This region contains two other imprinted genes, insulin-like growth factor II (IGF-II) and H19, both of which seem to be implicated in adrenal neoplasms. We analyzed the expression of the putative tumor suppressor p57KIP2 gene by Northern blotting in normal and hyperplastic adrenals, adrenocortical tumors, and pheochromocytomas. The expression of p57KIP2 messenger ribonucleic acid (mRNA) correlated positively with H19 and negatively with IGF-II RNA in adrenocortical tissues. p57KIP2 mRNA (and H19 RNA) was abundantly expressed in normal human adrenals, adrenocortical adenomas from patients with Cushing's or Conn's syndrome or without clinical evidence of hormone overproduction, hyperplastic adrenals, and tumor-adjacent adrenal tissues, in which IGF-II mRNA expression was low. In most adrenocortical carcinomas and virilizing adrenal adenomas, very low levels of both p57KIP2 and H19 RNAs were observed, whereas IGF-II was highly expressed. In pheochromocytomas, p57KIP2 and H19 RNA expression was highly variable, but on the average it was about 45% and 27%, respectively, of that in normal and tumor-adj...Continue Reading
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