American Association for Cancer Research
00085472can123429-sup-can-12-3429fig1.pdf (122.26 kB)

Supplementary Figure 1 from Acute and Fractionated Irradiation Differentially Modulate Glioma Stem Cell Division Kinetics

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journal contribution
posted on 2023-03-30, 22:09 authored by Xuefeng Gao, J. Tyson McDonald, Lynn Hlatky, Heiko Enderling

PDF file - 122K, GSC fraction as function of symmetric division rate ps (means � s.d., n=5). Shaded area shows the original fraction of CD133+ cells in U87-MG cells estimated by Kim et al. (22).



Glioblastoma multiforme (GBM) is one of the most aggressive human malignancies with a poor patient prognosis. Ionizing radiation either alone or adjuvant after surgery is part of standard treatment for GBM but remains primarily noncurative. The mechanisms underlying tumor radioresistance are manifold and, in part, accredited to a special subpopulation of tumorigenic cells. The so-called glioma stem cells (GSC) are bestowed with the exclusive ability to self-renew and repopulate the tumor and have been reported to be less sensitive to radiation-induced damage through preferential activation of DNA damage checkpoint responses and increased capacity for DNA damage repair. During each fraction of radiation, non–stem cancer cells (CC) die and GSCs become enriched and potentially increase in number, which may lead to accelerated repopulation. We propose a cellular Potts model that simulates the kinetics of GSCs and CCs in glioblastoma growth and radiation response. We parameterize and validate this model with experimental data of the U87-MG human glioblastoma cell line. Simulations are conducted to estimate GSC symmetric and asymmetric division rates and explore potential mechanisms for increased GSC fractions after irradiation. Simulations reveal that in addition to their higher radioresistance, a shift from asymmetric to symmetric division or a fast cycle of GSCs following fractionated radiation treatment is required to yield results that match experimental observations. We hypothesize a constitutive activation of stem cell division kinetics signaling pathways during fractionated treatment, which contributes to the frequently observed accelerated repopulation after therapeutic irradiation. Cancer Res; 73(5); 1481–90. ©2012 AACR.

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