1α-Hydroxyvitamin D2 inhibits growth of human neuroblastoma

Paul R. van Ginkel, William Yang, Marcus M. Marcet, Clement C. Chow, Amol D. Kulkarni, Soesiawati Darjatmoko, Mary J. Lindstrom, Janice Lokken, Saswati Bhattacharya, Daniel M. Albert

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12 Scopus citations

Abstract

Neuroblastoma is the most common extracranial solid tumor in childhood. The poor outcomes of patients with high-risk neuroblastoma have encouraged the search for new therapies. In the current study, the effect of the vitamin D analog 1α-hydroxyvitamin D2 (1α-OH-D2, doxercalciferol) was assessed in a mouse xenograft model of human neuroblastoma. Vitamin D receptor (VDR) expression levels in seven neuroblastoma cell lines were compared using real-time PCR. SK-N-AS cells, which express relatively high levels of VDR, were injected into the flanks of 60 mice. The mice were treated daily via oral gavage for 5 weeks with vehicle (control), 0.15 μg, or 0.3 μg of 1α-OH-D2. The animals were then euthanized, and tumors, sera, and kidneys were collected and analyzed. End tumor volumes were significantly smaller in both the 0.15 μg group (712.07 mm3, P = 0.0121) and 0.3 μg group (772.97 mm3, P = 0.0209) when compared to controls (1,681.75 mm3). In terms of toxicity, serum calcium levels were increased but mortality was minimal in both treatment groups. These results were similar to those previously described in the transgenic (LHβ-Tag) and human xenograft (Y-79) models of retinoblastoma, a related tumor. In vitro cell viability studies of SK-N-AS and NGP cells, which represent two major human neuroblastoma subtypes that differ in their genetic abnormalities as well as their VDR expression levels, show that both are sensitive to calcitriol, the active metabolite of vitamin D3. In conclusion, the present study shows that 1α-OH-D2 can inhibit human neuroblastoma growth in vivo with relatively low toxicity. The safety of 1α-OH-D2 has been extensively studied; the drug is FDA-approved for the treatment of adult kidney patients, and Phase I/II trials have been conducted in adult oncology patients. There should not be major obstacles to starting Phase I and II clinical trials with this drug in pediatric patients with high-risk neuroblastoma.

Original languageEnglish (US)
Pages (from-to)255-262
Number of pages8
JournalJournal of Neuro-Oncology
Volume85
Issue number3
DOIs
StatePublished - Dec 1 2007

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Keywords

  • Doxercalciferol
  • Neuroblastoma
  • Serum calcium
  • Vitamin D analog
  • Xenograft model

ASJC Scopus subject areas

  • Oncology
  • Neurology
  • Clinical Neurology
  • Cancer Research

Cite this

van Ginkel, P. R., Yang, W., Marcet, M. M., Chow, C. C., Kulkarni, A. D., Darjatmoko, S., Lindstrom, M. J., Lokken, J., Bhattacharya, S., & Albert, D. M. (2007). 1α-Hydroxyvitamin D2 inhibits growth of human neuroblastoma. Journal of Neuro-Oncology, 85(3), 255-262. https://doi.org/10.1007/s11060-007-9418-z