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Using Primary Neurosphere Cultures to Study Primary Cilia
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Breaking down glioma primary cilia disassembly.

Matthew R Sarkisian1,2, Loic P Deleyrolle3, Joshua J Breunig4,5,6,7

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Glioblastoma (GBM) cells disassemble cilia for mitosis, but the mechanisms are unclear. GBM cells use alternate pathways to disassemble cilia or maintain them, impacting tumor progression and treatment resistance.

Keywords:
AURKAHDAC6cancer stem cellsciliaglioblastoma

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Area of Science:

  • Cell Biology
  • Cancer Research
  • Molecular Biology

Background:

  • Primary cilia are common in postmitotic cells but rare in aggressive glioblastoma (GBM).
  • Cilia disassembly is essential for GBM cell division, but the underlying molecular mechanisms remain poorly understood.
  • The aurora kinase A (AURKA) and histone deacetylase 6 (HDAC6) axis is implicated in cilia disassembly and often overexpressed in GBM.

Purpose of the Study:

  • To review regulators of the core cilia disassembly pathway involving AURKA and HDAC6 in GBM.
  • To discuss recent studies investigating the inhibition of AURKA and HDAC6 in GBM models.
  • To explore alternative mechanisms of cilia disassembly and persistence in GBM cells.

Main Methods:

  • Literature review of core pathway regulators (AURKA, HDAC6).
  • Discussion of studies using GBM patient and mouse models with AURKA/HDAC6 inhibitors.
  • Analysis of GBM cell responses to inhibitors, including cilia disassembly and persistence.

Main Results:

  • GBM cells employ pathways independent of the core AURKA/HDAC6 axis for cilia disassembly.
  • GBM cells can modify axonemal tubulin to maintain cilia despite inhibitors.
  • GBM tumors upregulate various proteins that drive cilia disassembly.

Conclusions:

  • Alternative mechanisms for cilia disassembly are crucial in GBM.
  • Understanding these pathways is vital given the role of cilia in tumor formation, angiogenesis, and treatment resistance.
  • Elucidating cilia's role in GBM may provide insights into the high recurrence rates of this aggressive brain cancer.