Cancer Chemotherapy and Pharmacology

, Volume 73, Issue 2, pp 271–279 | Cite as

p75 neurotrophin receptor and fenretinide-induced signaling in neuroblastoma

Original Article
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Abstract

Purpose

Neuroblastoma is the most common extracranial solid tumor of childhood. The retinoic acid analogue, fenretinide (4-hydroxyphenyl retinamide; 4-HPR), induces apoptosis in neuroblastoma cells in vitro and is currently in clinical trials for children with refractory neuroblastoma. We have previously shown that expression of the p75 neurotrophin receptor (p75NTR) enhances apoptosis induction and mitochondrial accumulation of reactive oxygen species by 4-HPR in neuroblastoma cells. We now examine the signaling events that underlie this effect.

Methods

Systematic examination of pro- and anti-apoptotic signaling effectors was performed by Western blot. Specific inhibitors of JNK phosphorylation and scavengers of mitochondrial reactive oxygen species were used to demonstrate the roles of these phenomena in the enhancement of fenretinide efficacy.

Results

The present studies demonstrate that enhancement of 4-HPR-induced apoptosis by p75NTR is dependent upon p38MAPK phosphorylation, JNK phosphorylation, caspase 3 activation, Akt cleavage, and decreased Akt phosphorylation. In addition, treatment with 4-HPR results in upregulation of MKK4 and MEKK1, and phosphorylation of MKK3/6. Efforts to enhance the efficacy of 4-HPR and to identify those tumors most likely to respond to it might exploit these effectors of 4-HPR-induced apoptosis.

Conclusions

Pharmacological agents that enhance MKK4 or MEKK1 expression or JNK expression or phosphorylation may enhance efficacy of 4-HPR in neuroblastomas that do not express high levels of p75NTR.

Keywords

Neuroblastoma Retinoids Signal transduction Apoptosis 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Center for Neural Development and DiseaseUniversity of Rochester Medical CenterRochesterUSA
  2. 2.Department of Pediatrics, Golisano Children’s HospitalUniversity of Rochester Medical CenterRochesterUSA
  3. 3.Department of NeurologyUniversity of Rochester Medical CenterRochesterUSA
  4. 4.Department of Neurobiology and AnatomyUniversity of Rochester Medical CenterRochesterUSA

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