Expression and functional analysis of pituitary tumor transforming growth factor-1 in uterine leiomyomas

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Abstract

Pituitary tumor-transforming gene-1 (PTTG-1) is a novel protooncogene overexpressed in numerous cancer cell lines and cancers. In this study we elucidate the expression of PTTG-1 in uterine leiomyomas and its functional role in the development of this disease. By comparing 23 pairs of leiomyomas and matched pairs of myometria, we found that the expression of PTTG-1 is significantly elevated in leiomyoma. The expression of PTTG-1 is independent of the menstrual cycle and is not affected by ovarian hormones. In contrast, basic fibroblast growth factor (bFGF) time- and dose-dependently stimulates PTTG-1 expression, which results in increasing cell proliferation. Forced expression of PTTG-1 by transient transfection stimulates bFGF and VEGF expression as well as changes the expression pattern of cell cycle proteins. Western blotting analysis demonstrates that the expressions of PTTG-1, bFGF, and the cell proliferation marker, proliferating cell nuclear antigen, are positively correlated with each other, which supports the hypothesis that the positive feedback loop between PTTG-1 and bFGF increases leiomyoma cell proliferation. In summary, we have shown for the first time that PTTG-1 is up-regulated in human uterine leiomyomas and that the positive feedback loop between PTTG-1 and bFGF may be pivotal in the growth of leiomyoma cells.

Original languageEnglish
Pages (from-to)3715-3723
Number of pages9
JournalJournal of Clinical Endocrinology and Metabolism
Volume90
Issue number6
DOIs
Publication statusPublished - 2005 Jun

All Science Journal Classification (ASJC) codes

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Endocrinology
  • Clinical Biochemistry
  • Biochemistry, medical

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