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Fractionated radiation promotes proliferation and radioresistance in bystander A549 cells but not in bystander HT29 cells.
Ghasemi, Zahra; Tahmasebi-Birgani, Mohammad-Javad; Ghafari Novin, Arefeh; Motlagh, Parisa Esmaili; Teimoori, Ali; Ghadiri, Ata; Pourghadamyari, Hossein; Sarli, Abdolazim; Khanbabaei, Hashem.
Affiliation
  • Ghasemi Z; Department of Molecular Genetics, Faculty of Modern Sciences, Tehran Medical Sciences Branch, Islamic Azad University, Tehran, Iran.
  • Tahmasebi-Birgani MJ; Department of Medical Physics, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
  • Ghafari Novin A; Department of Medical Genetics, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
  • Motlagh PE; Department of Molecular and Cell Biology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, General Campus, Tehran, Iran.
  • Teimoori A; Department of Virology, Faculty of Medicine, Hamedan University of Medical Sciences, Hamedan, Iran.
  • Ghadiri A; Cellular and Molecular Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
  • Pourghadamyari H; Department of Clinical Biochemistry, Afzalipour School of Medicine, Kerman University of Medical Sciences, Kerman, Iran.
  • Sarli A; Department of Medical Genetics, Medical Science School, Tarbiat Modares University, Tehran, Iran.
  • Khanbabaei H; Department of Medical Physics, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran. Electronic address: Khanbabaei.h@ajums.ac.ir.
Life Sci ; 257: 118087, 2020 Sep 15.
Article in En | MEDLINE | ID: mdl-32702442
AIMS: Recent studies suggest that direct exposure of cells to fractionated radiotherapy might induce radioresistance. However, the effects of fractionated radiotherapy on the non-irradiated bystander cells remain unclear. We hypothesized that fractionated radiotherapy could enhance radioresistance and proliferation of bystander cells. MAIN METHODS: Human tumor cell lines, including A549 and HT29 were irradiated (2 Gy per day). The irradiated cells (either A549 or HT29) were co-cultured with non-irradiated cells of the same line using transwell co-culture system. Tumor cell proliferation, radioresistance and apoptosis were measured using MTT assay, clonogenic survival assay and Annexin-V in bystander cells, respectively. In addition, activation of Chk1 (Ser 317), Chk2 (Thr 68) and Akt (Ser473) were measured via western blot. KEY FINDINGS: Irradiated HT29 cells induced conventional bystander effects detected as modulation of clonogenic survival parameters (decreased area under curve, D10 and ED50 and increased α) and proliferation in recipient neighbors. While, irradiated A549 cells significantly enhanced the radioresistance and proliferation of bystander cells. These changes were accompanied with enhanced activation of Chk1, Chk2 and Akt in non-irradiated bystander A549 cells. Moreover, both bystander effects (damaging and protective) were mediated through secreted factors. SIGNIFICANCE: These findings suggest that fractionated radiotherapy could promote proliferation and radioresistance of bystander cells probably through survival and proliferation pathways.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Radiation Tolerance / Apoptosis / Bystander Effect / Cell Proliferation Limits: Humans Language: En Journal: Life Sci Year: 2020 Document type: Article Affiliation country: Country of publication:

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Radiation Tolerance / Apoptosis / Bystander Effect / Cell Proliferation Limits: Humans Language: En Journal: Life Sci Year: 2020 Document type: Article Affiliation country: Country of publication: