Apoptotic death of prostate cancer cells by a gonadotropin-releasing hormone-II antagonist

Sumi Park, Ji Man Han, Jun Cheon, Jong-Ik Hwang, Jae Young Seong

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Gonadotropin-releasing hormone-I (GnRH-I) has attracted strong attention as a hormonal therapeutic tool, particularly for androgen-dependent prostate cancer patients. However, the androgen-independency of the cancer in advanced stages has spurred researchers to look for new medical treatments. In previous reports, we developed the GnRH-II antagonist Trp-1 to inhibit proliferation and stimulate the autophagic death of various prostate cancer cells, including androgen-independent cells. We further screened many GnRH-II antagonists to identify molecules with higher efficiency. Here, we investigated the effect of SN09-2 on the growth of PC3 prostate cancer cells. SN09-2 reduced the growth of prostate cancer cells but had no effect on cells derived from other tissues. Compared with Trp-1, SN09-2 conspicuously inhibited prostate cancer cell growth, even at low concentrations. SN09-2-induced PC3 cell growth inhibition was associated with decreased membrane potential in mitochondria where the antagonist was accumulated, and increased mitochondrial and cytosolic reactive oxygen species. SN09-2 induced lactate dehydrogenase release into the media and annexin V-staining on the PC3 cell surface, suggesting that the antagonist stimulated prostate cancer cell death by activating apoptotic signaling pathways. Furthermore, cytochrome c release from mitochondria to the cytosol and caspase-3 activation occurred in a concentration- and time-dependent manner. SN09-2 also inhibited the growth of PC3 cells xenotransplanted into nude mice. These results demonstrate that SN09-2 directly induces mitochondrial dysfunction and the consequent ROS generation, leading to not only growth inhibition but also apoptosis of prostate cancer cells.

Original languageEnglish
Article numbere99723
JournalPLoS One
Volume9
Issue number6
DOIs
Publication statusPublished - 2014 Jun 13

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Hormone Antagonists
prostatic neoplasms
gonadotropin-releasing hormone
Gonadotropin-Releasing Hormone
antagonists
Prostatic Neoplasms
Cells
death
Androgens
Mitochondria
Cell growth
androgens
cell growth
Growth
Annexin A5
Cell death
growth retardation
Cytochromes c
L-Lactate Dehydrogenase
Caspase 3

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)

Cite this

Apoptotic death of prostate cancer cells by a gonadotropin-releasing hormone-II antagonist. / Park, Sumi; Han, Ji Man; Cheon, Jun; Hwang, Jong-Ik; Seong, Jae Young.

In: PLoS One, Vol. 9, No. 6, e99723, 13.06.2014.

Research output: Contribution to journalArticle

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