Radiobiological effects of flattening filter and flattening filter free radiotherapy x-ray on inflammatory and apoptotic pathways in cardiac and pulmonary tissues in an MCF-7 xenograft breast cancer model
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ID: 320081
2026
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Abstract
This study investigated early inflammatory and apoptotic molecular responses in heart and lung tissues following flattening filter (FF) and flattening filter-free (FFF) radiotherapy in a murine MCF-7 xenograft breast cancer model. Mice received a single 20 Gy fraction in FF (400 MU/min) or FFF (1820 MU/min) mode, and cardiopulmonary tissues were analyzed 48 h post-irradiation. Gene expression of Tnf, Il1b, Nfkb and p53 was assessed by RT-qPCR, while NF-κB p65 activation and caspase-3-mediated apoptosis were evaluated by western blot. Both irradiation modalities significantly increased inflammatory cytokine expression and NF-κB signaling compared with controls (P < 0.05), with consistently stronger responses following FFF irradiation. Lung p53 expression increased progressively across tumor-bearing and irradiated groups, indicating enhanced DNA damage signaling, while elevated cleaved caspase-3 levels reflected apoptotic activation, particularly in irradiated groups. Overall, high-dose-rate FFF radiotherapy elicits more pronounced early inflammatory and apoptotic responses in non-target heart and lung tissues than conventional FF delivery, highlighting the importance of incorporating normal tissue radiobiological effects into high-dose-rate radiotherapy strategies.
| Reference Key |
openalex_W7167643965
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| Authors | Fatih Hacimustafaoğlu, Serhat Aras, Yalçın Erzurumlu, Burcu Çaykara |
| Journal | journal of radiation research |
| Year | 2026 |
| DOI |
10.1093/jrr/rrag046
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| URL | |
| Keywords | Keywords not found |
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