Abstract
To understand the role of corticosteroid-binding globulin (CBG) in the intracellular steroidal actions in human ovarian cancers, the level of CBG mRNA expression was evaluated in normal ovarian tissues and in ovarian cancers using competitive reverse transcription-polymerase chain reaction-Southern blot analysis. The expression of CBG mRNA was detected in all normal ovaries and ovarian cancers analyzed. There were no significant differences in the mean CBG mRNA levels between normal ovaries and ovarian cancers. The expression in normal ovaries was significantly higher (p < 0.01) in the premenopause than in the postmenopause. A high expression of CBG mRNA was observed in 11 out of 29 cases (38%) of ovarian cancer in comparison with normal ovaries. There was no difference in the expression among the histological classifications or clinical stages of ovarian cancers. These data suggest that human normal ovaries and ovarian cancers might synthesize CBG intracellularly, ovarian cancers might conserve a progesterone-associated property via CBG, and the regulation of intracelluar CBG expression might be changed in some cancers.
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