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Intracranial Orthotopic Allografting of Medulloblastoma Cells in Immunocompromised Mice
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HDAC and PI3K Antagonists Cooperate to Inhibit Growth of MYC-Driven Medulloblastoma

Yanxin Pei1, Kun-Wei Liu2, Jun Wang2

  • 1Tumor Initiation and Maintenance Program, NCI-Designated Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037, USA; Cancer and Immunology Department, Brain Tumor Institute, Children's National Medical Center, Washington, DC 20010, USA.

Cancer Cell
|March 16, 2016
PubMed

Insights

Histone deacetylase inhibitors show promise in treating MYC-driven medulloblastoma (MB), a deadly pediatric brain tumor. Combining HDAC inhibitors with PI3K inhibitors offers a potential new therapy for aggressive MB cases.

Area of Science:

  • Oncology
  • Neuro-oncology
  • Molecular Biology

Background:

  • Medulloblastoma (MB) is a highly malignant pediatric brain tumor.
  • MYC-driven MB has a poor prognosis, necessitating novel therapeutic strategies.
  • Current treatments for MB survivors often result in severe long-term side effects.

Purpose of the Study:

  • To identify novel therapeutic agents targeting MYC-driven medulloblastoma.
  • To investigate the efficacy of histone deacetylase inhibitors (HDACIs) in preclinical models of MB.
  • To explore combination therapies for aggressive forms of MB.

Main Methods:

  • Utilized a preclinical animal model of MYC-driven medulloblastoma.
  • Screened compounds to identify those decreasing tumor cell viability.
  • Assessed the effects of HDACIs on tumor suppressor gene expression (FOXO1).
  • Evaluated the synergistic effects of HDACIs and phosphatidylinositol 3-kinase (PI3K) inhibitors in vivo.

Main Results:

  • HDACIs demonstrated potent inhibition of MYC-driven MB cell survival in vitro.
  • HDACIs were found to induce the expression of the FOXO1 tumor suppressor gene.
  • Combination therapy with HDACIs and PI3K inhibitors significantly inhibited tumor growth in vivo.

Conclusions:

  • HDACIs represent a promising therapeutic approach for MYC-driven medulloblastoma.
  • Induction of FOXO1 is a key mechanism by which HDACIs exert their anti-tumor effects.
  • A combination of HDACIs and PI3K inhibitors offers an effective treatment strategy for aggressive MB.

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