The regulation of apoptosis by activin and transforming growth factor-β in early neoplastic and tumorigenic ovarian surface epithelium

Kyung Chul Choi, Sung Keun Kang, Chen Jei Tai, Nelly Auersperg, Peter C K Leung

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Most ovarian neoplasms arise from the ovarian surface epithelium (OSE), and multiple growth factors have been implicated to influence the transformation from OSE. The present study was performed to investigate the role of activin and transforming growth factor-β (TGFβ) in normal and neoplastic OSE cells. An immortalized OSE cell line (IOSE-29) was generated from normal OSE by transfecting simian virus 40 large T antigen and was rendered tumorigenic after subsequent transfection with the E-cadherin gene (IOSE-29EC). The activin/inhibin subunits and activin receptors were expressed at both messenger ribonucleic acids and protein levels in these cells, suggesting that activin may have an autocrine role in neoplastic OSE cells. Treatments with activin (1-100 ng/mL) resulted in a significant decrease in cell proliferation in both IOSE-29 and IOSE-29EC cells, although we have shown that it stimulated the growth of ovarian cancer cells and had no effect on normal OSE. This inhibitory effect was attenuated with cotreatment with follistatin. Treatment with TGFβ (0.1-10 ng/mL) also significantly decreased the proliferation of normal, IOSE-29, and IOSE-29EC cells in a dose-dependent manner. In addition, treatments with both activin and TGFβ resulted in an increase in DNA fragmentation in IOSE-29EC cells in a dose-dependent manner. This apoptotic effect of activin was attenuated by cotreatment with follistatin. Treatment with TGFβ (1 and 10 ng/mL) resulted in a significant decrease in Bcl-2 protein (up to 50%) in IOSE-29EC, whereas no difference was observed in Bax protein levels. Therefore, down-regulated Bcl-2 by TGFβ may eventually induce apoptosis in IOSE-29EC cells. In contrast, no difference was observed in Bax and Bcl-2 protein expression after treatment with activin. In conclusion, the present study indicates that activin and TGFβ inhibited growth and induced apoptosis in early neoplastic (IOSE-29) and tumorigenic OSE (IOSE-29EC) cells. Furthermore, antiapoptotic Bcl-2 protein was down-regulated by TGFβ, whereas no difference was produced in Bax protein by activin or TGFβ treatment or in Bcl-2 protein by activin. These results suggest that activin and TGFβ may play a role in growth inhibition and induction of apoptosis in early neoplastic and tumorigenic stage of ovarian cancer.

Original languageEnglish
Pages (from-to)2125-2135
Number of pages11
JournalJournal of Clinical Endocrinology and Metabolism
Volume86
Issue number5
DOIs
Publication statusPublished - 2001
Externally publishedYes

Fingerprint

Activins
Transforming Growth Factors
Epithelium
Apoptosis
Follistatin
Ovarian Neoplasms
bcl-2-Associated X Protein
Proteins
Growth
Cells
Activin Receptors
Inhibins
Simian virus 40
Viral Tumor Antigens
Cell proliferation
DNA Fragmentation
Cadherins
Viruses
Transfection
Intercellular Signaling Peptides and Proteins

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology, Diabetes and Metabolism

Cite this

The regulation of apoptosis by activin and transforming growth factor-β in early neoplastic and tumorigenic ovarian surface epithelium. / Choi, Kyung Chul; Kang, Sung Keun; Tai, Chen Jei; Auersperg, Nelly; Leung, Peter C K.

In: Journal of Clinical Endocrinology and Metabolism, Vol. 86, No. 5, 2001, p. 2125-2135.

Research output: Contribution to journalArticle

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abstract = "Most ovarian neoplasms arise from the ovarian surface epithelium (OSE), and multiple growth factors have been implicated to influence the transformation from OSE. The present study was performed to investigate the role of activin and transforming growth factor-β (TGFβ) in normal and neoplastic OSE cells. An immortalized OSE cell line (IOSE-29) was generated from normal OSE by transfecting simian virus 40 large T antigen and was rendered tumorigenic after subsequent transfection with the E-cadherin gene (IOSE-29EC). The activin/inhibin subunits and activin receptors were expressed at both messenger ribonucleic acids and protein levels in these cells, suggesting that activin may have an autocrine role in neoplastic OSE cells. Treatments with activin (1-100 ng/mL) resulted in a significant decrease in cell proliferation in both IOSE-29 and IOSE-29EC cells, although we have shown that it stimulated the growth of ovarian cancer cells and had no effect on normal OSE. This inhibitory effect was attenuated with cotreatment with follistatin. Treatment with TGFβ (0.1-10 ng/mL) also significantly decreased the proliferation of normal, IOSE-29, and IOSE-29EC cells in a dose-dependent manner. In addition, treatments with both activin and TGFβ resulted in an increase in DNA fragmentation in IOSE-29EC cells in a dose-dependent manner. This apoptotic effect of activin was attenuated by cotreatment with follistatin. Treatment with TGFβ (1 and 10 ng/mL) resulted in a significant decrease in Bcl-2 protein (up to 50{\%}) in IOSE-29EC, whereas no difference was observed in Bax protein levels. Therefore, down-regulated Bcl-2 by TGFβ may eventually induce apoptosis in IOSE-29EC cells. In contrast, no difference was observed in Bax and Bcl-2 protein expression after treatment with activin. In conclusion, the present study indicates that activin and TGFβ inhibited growth and induced apoptosis in early neoplastic (IOSE-29) and tumorigenic OSE (IOSE-29EC) cells. Furthermore, antiapoptotic Bcl-2 protein was down-regulated by TGFβ, whereas no difference was produced in Bax protein by activin or TGFβ treatment or in Bcl-2 protein by activin. These results suggest that activin and TGFβ may play a role in growth inhibition and induction of apoptosis in early neoplastic and tumorigenic stage of ovarian cancer.",
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T1 - The regulation of apoptosis by activin and transforming growth factor-β in early neoplastic and tumorigenic ovarian surface epithelium

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AU - Tai, Chen Jei

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AU - Leung, Peter C K

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