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The HSP90 inhibitor onalespib potentiates 177Lu‑DOTATATE therapy in neuroendocrine tumor cells

  • Authors:
    • Sara Lundsten
    • Diana Spiegelberg
    • Bo Stenerlöw
    • Marika Nestor
  • View Affiliations / Copyright

    Affiliations: Department of Immunology, Genetics and Pathology, Uppsala University, 751 87 Uppsala, Sweden
    Copyright: © Lundsten et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 1287-1295
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    Published online on: September 30, 2019
       https://doi.org/10.3892/ijo.2019.4888
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Abstract

177Lu‑DOTATATE was recently approved for the treatment of somatostatin receptor (SSTR)‑positive neuroendocrine tumors (NETs). However, despite impressive response rates, complete responses are rare. Heat shock protein 90 (HSP90) inhibitors have been suggested as suitable therapeutic agents for NETs, as well as a potential radiosensitizers. Consequently, the aim of this study was to investigate whether the HSP90‑inhibitor onalespib could reduce NET cell growth and act as a radiosensitizer when used in combination with 177Lu‑DOTATATE. The NET cell lines BON, NCI‑H727 and NCI‑H460, were first characterized with regards to 177Lu‑DOTATATE uptake and sensitivity to onalespib treatment in monolayer cell assays. The growth inhibitory effects of the monotherapies and combination treatments were then examined in three‑dimensional multicellular tumor spheroids. Lastly, the molecular effects of the treatments were assessed. 177Lu‑DOTATATE uptake was observed in the BON and NCI‑H727 cells, while the NCI‑H460 cells exhibited no detectable uptake. Accordingly, 177Lu‑DOTATATE reduced the growth of BON and NCI‑H727 spheroids, while no effect was observed in the NCI‑H460 spheroids. Onalespib reduced cell viability and spheroid growth in all three cell lines. Furthermore, the combination of onalespib and 177Lu‑DOTATATE exerted synergistic therapeutic effects on the BON and NCI‑H727 spheroids. Western blot analysis of BON spheroids revealed the downregulation of epidermal growth factor receptor (EGFR) and the upregulation of γ H2A histone family member X (γH2AX) following combined treatment with onalespib and 177Lu‑DOTATATE. Moreover, flow cytometric analyses revealed a two‑fold increase in caspase 3/7 activity in the combination group. In conclusion, the findings of this study demonstrate that onalespib exerts antitumorigenic effects on NET cells and may thus be a feasible treatment option for NETs. Furthermore, onalespib was able to synergistically potentiate 177Lu‑DOTATATE treatment in a SSTR‑specific manner. The radiosensitizing mechanisms of onalespib involved the downregulation of EGFR expression and the induction of apoptosis. Consequently, the combination of onalespib and 177Lu‑DOTATATE may prove to be a promising strategy with which to improve therapeutic responses in patients with NETs. Further studies investigating this strategy in vivo regarding the therapeutic effects and potential toxicities are warranted to expand these promising findings.
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Copy and paste a formatted citation
Spandidos Publications style
Lundsten S, Spiegelberg D, Stenerlöw B and Nestor M: The HSP90 inhibitor onalespib potentiates 177Lu‑DOTATATE therapy in neuroendocrine tumor cells. Int J Oncol 55: 1287-1295, 2019.
APA
Lundsten, S., Spiegelberg, D., Stenerlöw, B., & Nestor, M. (2019). The HSP90 inhibitor onalespib potentiates 177Lu‑DOTATATE therapy in neuroendocrine tumor cells. International Journal of Oncology, 55, 1287-1295. https://doi.org/10.3892/ijo.2019.4888
MLA
Lundsten, S., Spiegelberg, D., Stenerlöw, B., Nestor, M."The HSP90 inhibitor onalespib potentiates 177Lu‑DOTATATE therapy in neuroendocrine tumor cells". International Journal of Oncology 55.6 (2019): 1287-1295.
Chicago
Lundsten, S., Spiegelberg, D., Stenerlöw, B., Nestor, M."The HSP90 inhibitor onalespib potentiates 177Lu‑DOTATATE therapy in neuroendocrine tumor cells". International Journal of Oncology 55, no. 6 (2019): 1287-1295. https://doi.org/10.3892/ijo.2019.4888
Copy and paste a formatted citation
x
Spandidos Publications style
Lundsten S, Spiegelberg D, Stenerlöw B and Nestor M: The HSP90 inhibitor onalespib potentiates 177Lu‑DOTATATE therapy in neuroendocrine tumor cells. Int J Oncol 55: 1287-1295, 2019.
APA
Lundsten, S., Spiegelberg, D., Stenerlöw, B., & Nestor, M. (2019). The HSP90 inhibitor onalespib potentiates 177Lu‑DOTATATE therapy in neuroendocrine tumor cells. International Journal of Oncology, 55, 1287-1295. https://doi.org/10.3892/ijo.2019.4888
MLA
Lundsten, S., Spiegelberg, D., Stenerlöw, B., Nestor, M."The HSP90 inhibitor onalespib potentiates 177Lu‑DOTATATE therapy in neuroendocrine tumor cells". International Journal of Oncology 55.6 (2019): 1287-1295.
Chicago
Lundsten, S., Spiegelberg, D., Stenerlöw, B., Nestor, M."The HSP90 inhibitor onalespib potentiates 177Lu‑DOTATATE therapy in neuroendocrine tumor cells". International Journal of Oncology 55, no. 6 (2019): 1287-1295. https://doi.org/10.3892/ijo.2019.4888
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