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Sphingadienes show therapeutic efficacy in neuroblastoma in vitro and in vivo by targeting the AKT signaling pathway

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A Correction to this article was published on 29 April 2019

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Summary

Neuroblastoma is a childhood malignancy that accounts for approximately 15% of childhood cancer deaths. Only 20–35% of children with metastatic neuroblastoma survive with standard therapy. Identification of more effective therapies is essential to improving the outcome of children with high-stage disease. Sphingadienes (SD) are growth-inhibitory sphingolipids found in natural sources including soy. They exhibit chemopreventive activity in mouse models of colon cancer, where they mediate cytotoxicity by inhibiting key pro-carcinogenic signaling pathways. In this study, the effect of SD on neuroblastoma was analyzed. Low micromolar concentrations of SD were cytotoxic to transformed and primary neuroblastoma cells independently of N-Myc amplification status. SD induced both caspase-dependent apoptosis and autophagy in neuroblastoma cells. However, only inhibition of caspase-dependent apoptosis protected neuroblastoma cells from SD-mediated cytotoxicity. SD also inhibited AKT activation in neuroblastoma cells as shown by reduced phosphorylated AKT levels. Pre-treatment with insulin attenuated SD-mediated cytotoxicity in vitro. SD-loaded nanoparticles (NP) administered parenterally to immunodeficient mice carrying neuroblastoma xenografts resulted in cytotoxic levels of SD in the circulation and significantly reduced tumor growth compared to vehicle-treated controls. Analysis of tumor extracts demonstrated reduced AKT activation in tumors of mice treated with SD-NP compared to controls treated with empty NP. Our findings indicate SD are novel potential chemotherapeutic agents that promote neuroblastoma cell death and reduce tumorigenicity in vivo.

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Change history

  • 29 April 2019

    The authors would like to note an omission of disclosure in this paper. Author JDS is cofounder, equity-holder, and consultant of GILTRx Therapeutics.

  • 29 April 2019

    The authors would like to note an omission of disclosure in this paper. Author JDS is cofounder, equity-holder, and consultant of GILTRx Therapeutics.

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Acknowledgments

This study was supported by St. Baldricks Fellowship Grant 245216 (AEA), National Institutes of Health grants R01CA129438, S10OD018070 and Swim Across America Foundation (JDS) and National Institutes of Health grant R37 HL-64159 (ROR).

Author information

Authors and Affiliations

Authors

Contributions

All authors contributed substantially to the study. Data were generated and analysed by PZ, AEA, LAP, JYL, JHS, LP, MZ, JB and AW. ROR contributed to the design of some of the studies and interpretation of results. JDS designed the overall study, interpreted all results and wrote the manuscript. All authors reviewed the manuscript for accuracy and contributed to the writing of the manuscript.

Corresponding author

Correspondence to Julie D. Saba.

Ethics declarations

Conflicts of interest

Author Piming Zhao declares that he has no conflict of interest. Author Ana E. Aguilar declares that she has no conflict of interest. Author Joanna Y. Lee declares she has no conflict of interest. Author Lucy A. Paul declares she has no conflict of interest. Author Jung H. Suh declares he has no conflict of interest. Author Latika A. Puri declares that she has no conflict of interest. Author Meng Zhang declares he has no conflict of interest. Author Jennifer Beckstead declares she has no conflict of interest. Author Andrzej Witkowski declares he has no conflict of interest. Author Robert O. Ryan declares he has no conflict of interest. Author Julie. D Saba declares she has no conflict of interest.

Ethical approvals

Human tumor and nonmalignant tissues utilized in this study were acquired in accordance with an approved UCSF Benioff Children’s Hospital Oakland Institutional Review Board protocol and with informed consent. All animal experiments conducted in this study were performed in accordance with an approved UCSF Benioff Children’s Hospital Oakland Institutional Animal Care and Use Committee protocol.

Electronic supplementary material

Supplemental Figure 1

SD are cytotoxic to three transformed neuroblastoma cell lines. Kelly, SHSY5Y and LAN-5 neuroblastoma cells were grown to 70% confluence in the preferred medium plus 10% FCS, then changed to serum-free medium and treated with either 10 μM SD (Kelly and SHSY5Y), 15 μM SD (LAN-5) or vehicle (Veh). After 18–24 h, cells were harvested, and viability was determined by MTS assay. Results are presented as arbitrary units (AU). Each condition was analysed in triplicate, and results are representative of at least three experiments. (A) Kelly cells; (B) SHSY5Y cells; (C) LAN-5 cells. * p < 0.05. (GIF 81 kb)

High Resolution Image (TIFF 1521 kb)

Supplemental Figure 2

SD are cytotoxic to primary neuroblastoma cells. (A) Immunofluorescence microscopy of primary neuroblastoma cells stained with neuronal markers tyrosine hydroxylase (TH), synaptophysin (SP), and the nuclear marker DAPI. Kelly cells were used as a positive control. (B) Primary neuroblastoma cells were exposed to SD concentrations ranging from 0 to15 μM. After a 24 h incubation, cell viability was assessed by the MTS assay. * p < 0.05 at 5 and 10 μM SD. (GIF 206 kb)

High Resolution Image (TIFF 1521 kb)

Supplemental Figure 3

Image quantification results for Fig. 3. (A) Image quantification represents the ratio of P-AKT/T-AKT in the immunoblot autoradiogram shown in (3A). (B) Image quantification represents ratio of cleaved PARP/uncleaved PARP in the immunoblot shown in (3A). (C) Image quantification represents the ratio of P-AKT/T-AKT in the immunoblot autoradiogram shown in (3B). (D) Image quantification represents the ratio of cleaved/uncleaved PARP in the immunoblot autoradiogram shown in (3B). (E) Image quantification represents the ratio of cleaved/uncleaved PARP in the immunoblot autoradiogram shown in (3C). All image quantification results are in relative units, with time zero or untreated condition arbitrarily set at one. These experiments were repeated at least three times with similar results. (GIF 91 kb)

High Resolution Image (TIFF 1521 kb)

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Zhao, P., Aguilar, A.E., Lee, J.Y. et al. Sphingadienes show therapeutic efficacy in neuroblastoma in vitro and in vivo by targeting the AKT signaling pathway. Invest New Drugs 36, 743–754 (2018). https://doi.org/10.1007/s10637-017-0558-5

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