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Article Open Access

Analysis of radiation effects in two irradiated tumor spheroid models

  • Authors:
    • Afkar Al‑Ramadan
    • Anja C. Mortensen
    • Jörgen Carlsson
    • Marika V. Nestor
  • View Affiliations / Copyright

    Affiliations: Department of Immunology, Genetics and Pathology, Uppsala University, SE‑751 85 Uppsala, Sweden
    Copyright: © Al‑Ramadan et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 3008-3016
    |
    Published online on: December 29, 2017
       https://doi.org/10.3892/ol.2017.7716
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Abstract

Multicellular spheroids have proven suitable as three-dimensional in vivo-like models of non-vascularized micrometastases. Unlike monolayer‑based models, spheroids mirror the cellular milieu and the pathophysiological gradients inside tumor nodules. However, there is limited knowledge of the radiation effects at the molecular level in spheroids of human origin. The present study is a presentation of selected cell biological processes that may easily be analyzed with methods available at routine pathology laboratories. Using gamma irradiated pancreatic neuroendocrine BON1 and colonic adenocarcinoma HCT116 spheroids as model systems, the present study assessed the radiobiological response in these models. Spheroid growth after irradiation was followed over time and molecular responses were subsequently assessed with immunohistochemistry (IHC) staining for descriptive analyses and semi‑automatic grading of apoptosis, G2‑phase and senescence in thin sections of the spheroids. Growth studies demonstrated the BON1 spheroids were slower growing and less sensitive to radiation compared with the HCT116 spheroids. IHC staining for G2‑phase was primarily observed in the outer viable P‑cell layers of the spheroids, with the 6 Gy irradiated HCT116 spheroids demonstrating a very clear increase in staining intensity compared with unirradiated spheroids. Apoptosis staining results indicated increased apoptosis with increasing radiation doses. No clear association between senescence and radiation exposure in the spheroids were observed. The present results demonstrate the feasibility of the use of multicellular spheroids of human origin in combination with IHC analyses to unravel radiobiological responses at a molecular level. The present findings inspire further investigations, including other relevant IHC‑detectable molecular processes in time‑ and radiation dose‑dependent settings.
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Copy and paste a formatted citation
Spandidos Publications style
Al‑Ramadan A, Mortensen AC, Carlsson J and Nestor MV: Analysis of radiation effects in two irradiated tumor spheroid models. Oncol Lett 15: 3008-3016, 2018.
APA
Al‑Ramadan, A., Mortensen, A.C., Carlsson, J., & Nestor, M.V. (2018). Analysis of radiation effects in two irradiated tumor spheroid models. Oncology Letters, 15, 3008-3016. https://doi.org/10.3892/ol.2017.7716
MLA
Al‑Ramadan, A., Mortensen, A. C., Carlsson, J., Nestor, M. V."Analysis of radiation effects in two irradiated tumor spheroid models". Oncology Letters 15.3 (2018): 3008-3016.
Chicago
Al‑Ramadan, A., Mortensen, A. C., Carlsson, J., Nestor, M. V."Analysis of radiation effects in two irradiated tumor spheroid models". Oncology Letters 15, no. 3 (2018): 3008-3016. https://doi.org/10.3892/ol.2017.7716
Copy and paste a formatted citation
x
Spandidos Publications style
Al‑Ramadan A, Mortensen AC, Carlsson J and Nestor MV: Analysis of radiation effects in two irradiated tumor spheroid models. Oncol Lett 15: 3008-3016, 2018.
APA
Al‑Ramadan, A., Mortensen, A.C., Carlsson, J., & Nestor, M.V. (2018). Analysis of radiation effects in two irradiated tumor spheroid models. Oncology Letters, 15, 3008-3016. https://doi.org/10.3892/ol.2017.7716
MLA
Al‑Ramadan, A., Mortensen, A. C., Carlsson, J., Nestor, M. V."Analysis of radiation effects in two irradiated tumor spheroid models". Oncology Letters 15.3 (2018): 3008-3016.
Chicago
Al‑Ramadan, A., Mortensen, A. C., Carlsson, J., Nestor, M. V."Analysis of radiation effects in two irradiated tumor spheroid models". Oncology Letters 15, no. 3 (2018): 3008-3016. https://doi.org/10.3892/ol.2017.7716
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