OCT4B Isoform Promotes Anchorage-Independent Growth of Glioblastoma Cells

Sang Hun Choi, Jun Kyum Kim, Hee Young Jeon, Kiyoung Eun, Hyunggee Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

OCT4, also known as POU5F1 (POU domain class 5 transcription factor 1), is a transcription factor that acts as a master regulator of pluripotency in embryonic stem cells and is one of the reprogramming factors required for generating induced pluripotent stem cells. The human OCT4 encodes three isoforms, OCT4A, OCT4B, and OCT4B1, which are generated by alternative splicing. Currently, the functions and expression patterns of OCT4B remain largely unknown in malignancies, especially in human glioblastomas. Here, we demonstrated the function of OCT4B in human glioblastomas. Among the isoform of OCT4B, OCT4B-190 (OCT4B19kDa) was highly expressed in human glioblastoma stem cells and glioblastoma cells and was mainly detected in the cytoplasm rather than the nucleus. Overexpression of OCT4B19kDa promoted colony formation of glioblastoma cells when grown in soft agar culture conditions. Clinical data analysis revealed that patients with gliomas that expressed OCT4B at high levels had a poorer prognosis than patients with gliomas that expressed OCT4B at low levels. Thus, OCT4B19kDa may play a crucial role in regulating cancer cell survival and adaption in a rigid environment.

Original languageEnglish
Pages (from-to)135-142
Number of pages8
JournalMolecules and cells
Volume42
Issue number2
DOIs
Publication statusPublished - 2019 Feb 28

Keywords

  • anchorage-independent growth
  • cytoplasmic localization
  • glioblastoma
  • mechanical stress response
  • OCT4B

ASJC Scopus subject areas

  • Medicine(all)

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