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A biological-based model that links genomic instability, bystander effects, and adaptive response
1Lovelace Respiratory Research Institute, 2425 Ridgecrest Drive SE, Albuquerque, NM 87108, USA. bscott@lrri.org
Mutation Research
|November 9, 2004
Summary
The NEOTRANS3 model simulates how radiation exposure impacts mammalian cells, introducing a protective apoptosis-mediated (PAM) process to suppress mutations and neoplastic transformation, crucial for understanding radiation response.
Area of Science:
- Radiation Biology
- Cellular and Molecular Biology
- Computational Biology
Background:
- Ionizing radiation induces DNA damage, leading to genomic instability and mutations in mammalian cells.
- Previous models like NEOTRANS2 addressed stochastic effects of low-dose radiation but lacked mechanisms for adaptive response.
- Genomic instability can arise from DNA misrepair, resulting in mutant cells and neoplastic transformation.
Purpose of the Study:
- To introduce NEOTRANS3, a novel biological-based, dose-response model extending NEOTRANS2.
- To incorporate the protective apoptosis-mediated (PAM) process for suppressing genomic instability and neoplastic transformation.
- To link genomic instability, bystander effects, and adaptive responses in mammalian cell communities under radiation exposure.
Main Methods:
- Development of the NEOTRANS3 model, an extension of NEOTRANS2, incorporating a dose-rate-dependent protective apoptosis-mediated (PAM) process.
- Modeling the interaction (cross-talk) between genomically compromised and non-compromised cells.
- Simulation of PAM activation within a specific dose-rate interval (D(PAM), D(off)) to suppress mutant and transformed cells.
Main Results:
- NEOTRANS3 demonstrates that the PAM process, activated by low linear energy transfer (LET) radiation, can suppress newly induced mutant cells and their transformed progeny.
- PAM cooperates with normal DNA repair and apoptosis to prevent genomic instability.
- PAM selectively removes genomically compromised cells, including mutants and transformed cells, within a defined dose-rate window.
Conclusions:
- The NEOTRANS3 model provides a framework for understanding adaptive responses to radiation, highlighting the role of PAM in mitigating genomic instability.
- PAM activation is crucial for protecting mammalian cells against radiation-induced mutations and neoplastic transformation.
- The model underscores the importance of dose-rate dependency in the efficacy of protective cellular mechanisms against radiation damage.