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14-3-3β Depletion Drives a Senescence Program in Glioblastoma Cells Through the ERK/SKP2/p27 Pathway

Sung Bin Seo1,2, Je-Jung Lee3, Hye Hyeon Yun1,2

  • 1Department of Biochemistry, College of Medicine, The Catholic University of Korea, 222, Banpo-daero, Seocho-gu, Seoul, 06591, Republic of Korea.

Molecular Neurobiology
|January 25, 2017
PubMed

Insights

14-3-3 beta protein negatively regulates cancer cell senescence. Depleting this protein induces senescence in glioblastoma cells via the ERK/SKP2/p27 pathway, offering a potential therapeutic target.

Area of Science:

  • Oncology
  • Cellular Biology
  • Molecular Biology

Background:

  • Cellular senescence is a key mechanism in tumor regression following stress.
  • 14-3-3 proteins are crucial scaffolding molecules with diverse cellular roles.
  • 14-3-3 beta (14-3-3β) expression correlates with astrocytoma malignancy.

Purpose of the Study:

  • To investigate the role of 14-3-3β in regulating senescence induction in glioblastoma cells.
  • To elucidate the molecular pathways involved in 14-3-3β-mediated senescence.
  • To assess the therapeutic potential of targeting 14-3-3β for glioblastoma treatment.

Main Methods:

  • Utilized small interfering RNA (siRNA) to knockdown 14-3-3β in A172 glioblastoma cells.
  • Assessed senescence phenotypes using senescence-associated β-galactosidase staining.
  • Analyzed protein expression levels (p27, SKP2, p53, p21, p-ERK) via Western blotting.
  • Investigated the role of ERK signaling using MEK inhibitor (U0126) and constitutively active ERK expression.

Main Results:

  • 14-3-3β knockdown induced significant cellular phenotypic changes and increased senescence markers.
  • Depletion of 14-3-3β led to elevated p27 and reduced SKP2 expression, without altering p53 or p21 levels.
  • ERK signaling was identified as a key modulator; 14-3-3β knockdown decreased p-ERK, while MEK inhibition mimicked senescence phenotypes, and active ERK reversed them.
  • Senescence was also induced in U87 glioblastoma cells upon 14-3-3β depletion.

Conclusions:

  • 14-3-3β acts as a negative regulator of senescence in glioblastoma cells.
  • The ERK/SKP2/p27 pathway is critical for 14-3-3β-mediated senescence.
  • Targeting 14-3-3β to induce premature senescence presents a promising therapeutic strategy for glioblastoma.
Keywords:
14-3-3βERKGlioblastomaSenescence

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