RRC ID 44282
著者 Cheng JC, Klausen C, Leung PC.
タイトル Overexpression of wild-type but not C134W mutant FOXL2 enhances GnRH-induced cell apoptosis by increasing GnRH receptor expression in human granulosa cell tumors.
ジャーナル PLoS One
Abstract The etiology of granulosa cell tumors (GCTs) is largely unknown. The primary mode of treatment is surgical, however not all women are cured by surgery alone. Thus, it is important to develop improved treatments through a greater understanding of the molecular mechanisms that contribute to this disease. Recently, it has been shown that a FOXL2 402C>G (C134W) mutation is present in 97% of human adult-type GCTs, suggesting an important role for this mutation in the development of GCTs. We have shown previously that gonadotropin-releasing hormone (GnRH)-I and -II induce apoptosis in cultured normal human granulosa cells. Moreover, it has been reported that FOXL2 can bind to the promoter of the mouse GnRH receptor gene and regulate its transcription. Thus, we hypothesized that C134W mutant FOXL2 could modulate the pro-apoptotic effects of GnRH via aberrant regulation of GnRH receptor levels. Using KGN cells, a human GCT-derived cell line which harbors the FOXL2 402C>G mutation, we show that treatment with GnRH-I and -II induces cell apoptosis, and that small interfering RNA-mediated depletion of GnRH receptor abolishes these effects. Overexpression of wild-type FOXL2 increases both mRNA and protein levels of GnRH receptor and consequently enhances GnRH-induced apoptosis. Importantly, neither the expression levels of GnRH receptor nor GnRH-induced apoptosis were affected by overexpression of the C134W mutant FOXL2. Interestingly, knockdown of endogenous FOXL2 down-regulates GnRHR expression in normal human granulosa cells with wild-type FOXL2, but not in KGN cells. These results suggest that the FOXL2 402C>G mutation may contribute to the development of human adult-type GCTs by reducing the expression of GnRH receptor, thus conferring resistance to GnRH-induced cell apoptosis.
巻・号 8(1)
ページ e55099
公開日 2013-1-1
DOI 10.1371/journal.pone.0055099
PII PONE-D-12-24246
PMID 23372819
PMC PMC3553060
MeSH Apoptosis* / drug effects Apoptosis* / genetics Cell Line, Tumor Cell Survival Female Forkhead Box Protein L2 Forkhead Transcription Factors / genetics* Gene Expression* Gene Expression Regulation, Neoplastic / drug effects Gene Knockdown Techniques Gonadotropin-Releasing Hormone / pharmacology* Granulosa Cell Tumor / genetics* Humans Mutation Ovarian Neoplasms / genetics* Receptors, LHRH / genetics* Receptors, LHRH / metabolism
IF 2.74
引用数 9
WOS 分野 ENDOCRINOLOGY & METABOLISM
リソース情報
ヒト・動物細胞 KGN(RCB1154)