Intercellular communications-redox interactions in radiation toxicity; potential targets for radiation mitigation

Area of Science:

• Radiation biology
• Cellular signaling
• Toxicology

Background:

• Ionizing radiation (IR) is vital in various applications but poses risks from accidental exposure.
• Radiation toxicity was previously thought to be direct, but recent research highlights intercellular communication's role.
• Intercellular signals amplify oxidative damage and inflammation via redox interactions and inflammatory mediators.

Purpose of the Study:

• To review the role of intercellular interactions in radiation-induced oxidative injury, inflammation, and cell death.
• To explore evidence for mitigating radiation injury by targeting these intercellular mediators.

Main Methods:

• Review of experimental data on intercellular signaling in radiation toxicity.
• Analysis of the role of cytokines, free radicals (e.g., nitric oxide), and enzymes (e.g., COX-2, NOS) in radiation effects.
• Examination of potential therapeutic targets for radioprotection and mitigation.

Main Results:

• Intercellular signals, including cytokines and nitric oxide, promote free radical production and inflammation.
• These signals contribute to cell-to-cell toxicity through a cohort effect.
• Targeting mediators like cytokines (IL-1β, TNF-α, TGF-β, IL-4, IL-13) and toll-like receptors (TLRs) shows promise for mitigating radiation injury.

Conclusions:

• Intercellular communication is a critical factor in radiation toxicity, driving oxidative stress and inflammation.
• Targeting specific intercellular mediators, including cytokines and TLRs, offers a promising strategy for radioprotection and mitigating radiation damage.