RRC ID 56654
Author Hua G, He C, Lv X, Fan L, Wang C, Remmenga SW, Rodabaugh KJ, Yang L, Lele SM, Yang P, Karpf AR, Davis JS, Wang C.
Title The four and a half LIM domains 2 (FHL2) regulates ovarian granulosa cell tumor progression via controlling AKT1 transcription.
Journal Cell Death Dis
Abstract The four and a half LIM domains 2 (FHL2) has been shown to play important roles in the regulation of cell proliferation, survival, adhesion, motility and signal transduction in a cell type and tissue-dependent manner. However, the function of FHL2 in ovarian physiology and pathology is unclear. The aim of this study was to determine the role and functional mechanism of FHL2 in the progression of ovarian granulosa cell tumors (GCTs). Immunohistochemical analysis indicated that FHL2 was overexpressed in GCT tissues. Cellular localization of FHL2 in GCT cells was cell cycle dependent. Knockdown of FHL2 suppressed GCT cell growth, reduced cell viability and inhibited cell migration. Consistently, ectopic expression of FHL2 in GCT cells with very low endogenous FHL2 promoted cell growth, improved cell viability and enhance cell migration. Importantly, overexpression of FHL2 promoted GCT progression in vivo. Mechanistic studies indicated that FHL2 regulates AKT1 gene expression in vitro and in vivo. Knockdown of FHL2 or AKT1 in GCT cell lines induced very similar phenotypes. Ectopic expression of constitutively active AKT1 rescued FHL2 knockdown-induced arrest of GCT cell growth and reduction of GCT cell viability, suggesting that FHL2 regulates GCT cell growth and viability through controlling AKT1 expression. Finally, co-immunoprecipitation and chromatin immunoprecipitation analyses indicated that FHL2 functions as a co-activator of NFκB and AP-1 to regulate AKT1 gene transcription. In conclusion, results from the present study indicate that FHL2 exerts its oncogenic action in GCT cells via controlling AKT1 gene expression. FHL2 is a promising target for the development of novel drugs against ovarian granulosa cell tumor.
Volume 7(7)
Pages e2297
Published 2016-7-14
DOI 10.1038/cddis.2016.207
PII cddis2016207
PMID 27415427
PMC PMC4973349
MeSH Animals Cell Line, Tumor Cell Transformation, Neoplastic / genetics* Cell Transformation, Neoplastic / metabolism Cell Transformation, Neoplastic / pathology Female Gene Expression Regulation, Neoplastic* Genes, Reporter Granulosa Cell Tumor / genetics* Granulosa Cell Tumor / metabolism Granulosa Cell Tumor / pathology Humans LIM-Homeodomain Proteins / antagonists & inhibitors LIM-Homeodomain Proteins / genetics* LIM-Homeodomain Proteins / metabolism Luciferases / genetics Luciferases / metabolism Mice Mice, Nude Muscle Proteins / antagonists & inhibitors Muscle Proteins / genetics* Muscle Proteins / metabolism NF-kappa B / genetics NF-kappa B / metabolism Neoplasm Transplantation Ovarian Neoplasms / genetics* Ovarian Neoplasms / metabolism Ovarian Neoplasms / pathology Proto-Oncogene Proteins c-akt / genetics* Proto-Oncogene Proteins c-akt / metabolism RNA, Small Interfering / genetics RNA, Small Interfering / metabolism Signal Transduction Transcription Factor AP-1 / genetics Transcription Factor AP-1 / metabolism Transcription Factors / antagonists & inhibitors Transcription Factors / genetics* Transcription Factors / metabolism Transcription, Genetic
IF 5.959
Times Cited 13
Resource
Human and Animal Cells KGN(RCB1154)