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EGFR signaling defines Mcl⁻1 survival dependency in neuroblastoma

Srilatha Nalluri1, Susan K Peirce, Rachel Tanos

  • 1a Division of Hematology/Oncology; Aflac Children's Cancer and Blood Disorders Center ; Children's Healthcare of Atlanta ; Atlanta , GA USA.

Cancer Biology & Therapy
|March 11, 2015
PubMed

Insights

Neuroblastoma (NB) survival often relies on Mcl-1. Targeting EGFR disrupts this Mcl-1 dependence, making NB cells sensitive to Bcl-2 inhibitors, offering new therapeutic strategies.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Therapeutics

Background:

  • Neuroblastoma (NB) is a pediatric cancer often dependent on the anti-apoptotic protein Mcl-1 for survival.
  • Current Mcl-1 inhibitors lack high affinity, creating a clinical need for novel inhibition strategies.
  • Receptor tyrosine kinases (RTKs) influence NB survival, but their role in regulating Bcl-2 family interactions in NB is unclear.

Purpose of the Study:

  • To investigate the role of RTKs, specifically EGFR, in Mcl-1 dependence in neuroblastoma.
  • To elucidate the mechanisms by which EGFR signaling impacts Mcl-1 and pro-apoptotic protein interactions.
  • To explore novel therapeutic strategies combining EGFR/ERK inhibition with Bcl-2 antagonism for NB treatment.

Main Methods:

  • Utilized NB cell lines selected for resistance to ABT-737, exhibiting Mcl-1 dependence.
  • Assessed EGFR expression and activation in diagnosis and relapse NB samples.
  • Employed shRNA, erlotinib, cetuximab (EGFR inhibitors), and U0126 (ERK inhibitor) to study molecular mechanisms.
  • Analyzed changes in Bim binding to Mcl-1 and Bcl-2, and Noxa expression.

Main Results:

  • NB cells resistant to ABT-737 showed increased EGFR expression and Mcl-1 dependence.
  • EGFR inhibition disrupted Bim binding to Mcl-1 and restored sensitivity to ABT-737 and cytotoxics.
  • EGFR/ERK inhibition promoted Noxa expression and Bim dephosphorylation, enhancing Bim binding to Bcl-2.
  • EGFR inhibition shifted NB dependence from Mcl-1 to Bcl-2.

Conclusions:

  • EGFR signaling drives Mcl-1 dependence in high-risk NB via ERK-mediated Bim phosphorylation.
  • Inhibition of EGFR/ERK shifts NB survival dependence to Bcl-2, suggesting combination therapy potential.
  • EGFR inhibitors alone are insufficient for recurrent NB; combination with Bcl-2 antagonists warrants further investigation.
Keywords:
ABT-737AKT, protein kinase BBH3, Bcl-2 homology domain 3Bcl-2 antagonistBcl-2 homology proteinsBcl-2, B-cell lymphoma-2EGFREGFR, epidermal growth factor receptorERK, extracellular signal related kinaseHR NB, high-risk neuroblastomaLPP, lambda protein phosphataseMcl-1Mcl-1, Myeloid cell leukemia-1NB, neuroblastomaRTK, receptor tyrosine kinaseTK, tyrosine kinaseWCL, whole cell lysateapoptosisbim regulationco-IP, co-immunoprecipitation

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