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Article

Anticancer effects of phytocannabinoids used with chemotherapy in leukaemia cells can be improved by altering the sequence of their administration

  • Authors:
    • Katherine A. Scott
    • Angus G. Dalgleish
    • Wai M. Liu
  • View Affiliations / Copyright

    Affiliations: Department of Oncology, Institute for Infection and Immunity, St George's, University of London, London SW17 0RE, UK
  • Pages: 369-377
    |
    Published online on: May 29, 2017
       https://doi.org/10.3892/ijo.2017.4022
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Abstract

Phytocannabinoids possess anticancer activity when used alone, and a number have also been shown to combine favourably with each other in vitro in leukaemia cells to generate improved activity. We have investigated the effect of pairing cannabinoids and assessed their anticancer activity in cell line models. Those most effective were then used with the common anti-leukaemia drugs cytarabine and vincristine, and the effects of this combination therapy on cell death studied in vitro. Results show a number of cannabinoids could be paired together to generate an effect superior to that achieved if the components were used individually. For example, in HL60 cells, the IC50 values at 48 h for cannabidiol (CBD) and tetrahydrocannabinol (THC) when used alone were 8 and 13 µM, respectively; however, if used together, it was 4 µM. Median-effect analysis confirmed the benefit of using cannabinoids in pairs, with calculated combination indices being <1 in a number of cases. The most efficacious cannabinoid-pairs subsequently synergised further when combined with the chemotherapy agents, and were also able to sensitise leukaemia cells to their cytotoxic effects. The sequence of administration of these drugs was important though; using cannabinoids after chemotherapy resulted in greater induction of apoptosis, whilst this was the opposite when the schedule of administration was reversed. Our results suggest that when certain cannabinoids are paired together, the resulting product can be combined synergistically with common anti-leukaemia drugs allowing the dose of the cytotoxic agents to be dramatically reduced yet still remain efficacious. Nevertheless, the sequence of drug administration is crucial to the success of these triple combinations and should be considered when planning such treatments.
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Copy and paste a formatted citation
Spandidos Publications style
Scott KA, Dalgleish AG and Liu WM: Anticancer effects of phytocannabinoids used with chemotherapy in leukaemia cells can be improved by altering the sequence of their administration. Int J Oncol 51: 369-377, 2017.
APA
Scott, K.A., Dalgleish, A.G., & Liu, W.M. (2017). Anticancer effects of phytocannabinoids used with chemotherapy in leukaemia cells can be improved by altering the sequence of their administration. International Journal of Oncology, 51, 369-377. https://doi.org/10.3892/ijo.2017.4022
MLA
Scott, K. A., Dalgleish, A. G., Liu, W. M."Anticancer effects of phytocannabinoids used with chemotherapy in leukaemia cells can be improved by altering the sequence of their administration". International Journal of Oncology 51.1 (2017): 369-377.
Chicago
Scott, K. A., Dalgleish, A. G., Liu, W. M."Anticancer effects of phytocannabinoids used with chemotherapy in leukaemia cells can be improved by altering the sequence of their administration". International Journal of Oncology 51, no. 1 (2017): 369-377. https://doi.org/10.3892/ijo.2017.4022
Copy and paste a formatted citation
x
Spandidos Publications style
Scott KA, Dalgleish AG and Liu WM: Anticancer effects of phytocannabinoids used with chemotherapy in leukaemia cells can be improved by altering the sequence of their administration. Int J Oncol 51: 369-377, 2017.
APA
Scott, K.A., Dalgleish, A.G., & Liu, W.M. (2017). Anticancer effects of phytocannabinoids used with chemotherapy in leukaemia cells can be improved by altering the sequence of their administration. International Journal of Oncology, 51, 369-377. https://doi.org/10.3892/ijo.2017.4022
MLA
Scott, K. A., Dalgleish, A. G., Liu, W. M."Anticancer effects of phytocannabinoids used with chemotherapy in leukaemia cells can be improved by altering the sequence of their administration". International Journal of Oncology 51.1 (2017): 369-377.
Chicago
Scott, K. A., Dalgleish, A. G., Liu, W. M."Anticancer effects of phytocannabinoids used with chemotherapy in leukaemia cells can be improved by altering the sequence of their administration". International Journal of Oncology 51, no. 1 (2017): 369-377. https://doi.org/10.3892/ijo.2017.4022
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