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RETRACTED: Vulnerability of glioblastoma cells to catastrophic vacuolization and death induced by a small molecule

Satish Srinivas Kitambi1, Enrique M Toledo1, Dmitry Usoskin1

  • 1Division of Molecular Neurobiology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 17177 Stockholm, Sweden.

Cell
|March 25, 2014
PubMed

Insights

Researchers discovered that targeting glioblastoma cells with novel compounds called Vacquinols induces massive vacuolization, leading to cancer cell death. This finding offers a new therapeutic strategy for aggressive brain cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Glioblastoma multiforme (GBM) is an aggressive brain cancer with poor prognosis.
  • GBM cells may possess unique functions exploitable for targeted therapies.

Purpose of the Study:

  • To screen patient-derived glioblastoma cells (GCs) for vulnerabilities.
  • To identify novel small molecules for targeted GBM treatment.

Main Methods:

  • Screening of patient-derived GCs.
  • Chemical synthesis and structure-activity relationship analysis of quinine-derivative NSC13316.
  • shRNA screening to identify signaling nodes.
  • In vivo pharmacokinetic and efficacy studies in a GBM animal model.

Main Results:

  • NSC13316 and its analogs, Vacquinols, selectively compromised GC viability.
  • Vacquinols induce cell death via membrane ruffling, macropinocytosis, ATP depletion, and cell rupture.
  • MAP kinase MKK4 identified as a critical signaling node.
  • Vacquinol-1 demonstrated favorable pharmacokinetics, brain exposure, and therapeutic efficacy in a GBM animal model.

Conclusions:

  • Massive vacuolization is a targetable vulnerability in glioblastoma.
  • Vacquinols represent a promising class of small molecules for glioblastoma therapy.
  • Targeting cellular vacuolization offers a novel approach for anticancer drug design.

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