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Updated: Dec 9, 2025

Oct4GiP Reporter Assay to Study Genes that Regulate Mouse Embryonic Stem Cell Maintenance and Self-renewal
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Published on: May 30, 2012

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Phosphorylation of OCT4 Serine 236 Inhibits Germ Cell Tumor Growth by Inducing Differentiation

Dong-Keon Kim1, Bomin Song1,2, Suji Han1

  • 1Research Institute, National Cancer Center, Goyang 10408, Korea.

Cancers
|September 16, 2020
PubMed

Insights

Phosphorylation of Octamer-binding transcription factor 4 (Oct4) at serine 236 promotes germ cell tumor growth. Mimicking this modification inhibits tumor progression, offering a novel cancer therapy strategy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Octamer-binding transcription factor 4 (Oct4) is crucial for pluripotency and implicated in cancer malignancies.
  • Posttranslational modifications of Oct4 are vital but often uncharacterized, particularly in cancer.

Purpose of the Study:

  • To investigate the role of Oct4 phosphorylation at serine 236 (Oct4 S236) in human germ cell tumors (GCTs).

Main Methods:

  • Analyzed Oct4 S236 phosphorylation in patient samples and GCT cell lines.
  • Utilized serine-to-aspartate mutation (S236D) to mimic phosphorylation.
  • Performed mRNA analysis and phenotypic studies.
  • Conducted mouse xenograft experiments.
  • Investigated the effect of protein phosphatase 1 inhibition.

Main Results:

  • Oct4 was phosphorylated at S236 in a cell cycle-dependent manner in GCTs.
  • Oct4 S236D expression induced tumor cell differentiation, growth retardation, and inhibited tumor sphere formation.
  • Oct4 S236D mimicked the effects of Oct4 depletion on mRNA and phenotype.
  • Inhibition of protein phosphatase 1 increased Oct4 S236 phosphorylation, leading to GCT differentiation.

Conclusions:

  • Oct4 S236 phosphorylation plays a significant role in GCT progression.
  • Targeting Oct4 S236 phosphorylation presents a potential therapeutic strategy for GCTs.
Keywords:
OCT4 inhibitorOCT4 serine 236Oct4cancer differentiationgerm cell tumorphosphorylation

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