Analysis of glucocorticoid receptors in human hepatocellular carcinoma and HepG2 cells

✍ Scribed by Wing-Yiu Lui; Fang-Ku P'Eng; Yuh-Fang Chang; Tai-Jay Chang; Ting-Fan Tsai; Mei-Ling Hsu; Tsung-Sheng Su; Shyh-Haw Tsay; Chew-Wun Wu; Tsung-Yun Liu; Chin-Wen Chi

• Publisher: John Wiley and Sons
• Year: 1993
• Tongue: English
• Weight: 875 KB
• Volume: 18
• Category: Article
• ISSN: 0270-9139
• DOI: 10.1002/hep.1840180524

✦ Synopsis

Hepatocellular carcinoma is the leading cause of male cancer death in Taiwan. We have found that the level of glucocorticoid receptor in hepatocellular carcinoma is significantly higher than that in the peritumoral tissue. In this study, we used a rat liver glucocorticoid receptor complementary DNA probe to examine the expression of glucocorticoid receptor gene in 15 paired samples of hepatocellular carcinoma and their peritumoral tissues. No differences in genomic DNA patterns of the glucocorticoid receptor gene were found between the tumor and peritumoral tissues. The amount of glucocorticoid receptor was found to be significantly higher in hepatoma samples than in peritumoral liver samples. The levels of glucocorticoid receptor messenger RNAs were increased in most tumors compared with their peritumoral samples. To examine the function of glucocorticoid receptors in hepatoma, we examined the expression of glucocorticoid receptor and its relation to cell-cycle progression in human HepG2 cells. Using specific monoclonal antibodies and flow cytometric study, we found glucocorticoid receptor to .be expressed constitutively in all cell-cycle phases. In addition, hydrocortisone treatment of HepG2 cells resulted in increased expression of glucocorticoid receptors and increased secretion of a-fetoprotein. RU-486, a glucocorticoid antagonist, blocked the hydrocortisone effect, indicating that glucocorticoid receptors are functional in HepG2 cells. Taken together, our data suggest that glucocorticoids and their receptors play an important role in the growth of hepatoma. (HEPATOLOGY 1993;18: 1167-1 174.)

Mammalian liver is one of the major target organs of steroid hormones. It is well known that steroid hormones act through their specific receptors, and steroid