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Gliomagenesis is orchestrated by the Oct3/4 regulatory network

Tatyana N Ignatova1,2, Hersh J Chaitin3, Nickolay V Kukekov4

  • 1Department of Neurosurgery, University of Tennessee, Health Science Center, Memphis, TN, USA.

Journal of Neurosurgical Sciences
|August 3, 2021
PubMed
Abstract

Insights

Glioblastoma stem cells (GSCs) maintain their stem-like state in 3D cultures, expressing key markers like Oct3/4 and CD133. Suppressing Oct3/4 significantly reduces GSC self-renewal and tumor formation.

Area of Science:

  • Neuroscience
  • Cancer Biology
  • Stem Cell Research

Background:

  • Glioblastoma multiforme (GBM) exhibits hierarchical phenotypic heterogeneity, leading to therapy resistance and tumor recurrence.
  • Neural stem cells (NSCs) and patient-derived glioblastoma stem cells (pdGSCs) were cultured in 2D and 3D systems.
  • The 3D monoclonal neurosphere culture system (pdMNCS) effectively models the GBM tumor microenvironment, preserving stem cell characteristics.

Purpose of the Study:

  • To investigate the role of specific stem cell markers in glioblastoma.
  • To compare the expression of cancer stem cell markers in 2D versus 3D culture systems.
  • To determine the necessity of Oct3/4 for glioblastoma stem cell (GSC) maintenance and gliomasphere formation.

Main Methods:

  • Utilized a 3D monoclonal neurosphere culture system (pdMNCS) for patient-derived GBM cells.
  • Examined expression of stem cell markers Nanog, Oct3/4, and CD133 in GBM cell lines.
  • Transfected 2D and 3D cultures with siRNA targeting Oct3/4 to assess its impact on gliomasphere formation.

Main Results:

  • CD133, a marker for GSCs, was robustly expressed in 3D-gliomaspheres but diminished in 2D cultures.
  • Incomplete differentiation of cytoskeleton and intermediate filaments was observed in patient-derived GBM cells.
  • Silencing Oct3/4 in GBM cells led to a significant reduction in gliomasphere formation, indicating its critical role.

Conclusions:

  • Oct3/4 and CD133 expression are crucial for suppressing GSC differentiation.
  • The 3D culture system is vital for maintaining GSC characteristics and relevant marker expression.
  • Targeting Oct3/4 may represent a therapeutic strategy to inhibit GSC self-renewal and GBM progression.

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