Nanoparticles can cause DNA damage across a cellular barrier

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cell Biology

Background:

• Nanoparticles are increasingly used in medicine, raising safety concerns regarding access to protected bodily sites.
• Evaluating nanoparticle safety requires understanding their interaction with biological barriers.

Purpose of the Study:

• To investigate the indirect effects of cobalt-chromium nanoparticles on human fibroblast cells across an intact cellular barrier.
• To elucidate the mechanism of nanoparticle-induced cellular damage mediated by intercellular signaling.

Main Methods:

• Exposure of human fibroblast cells to cobalt-chromium nanoparticles (29.5 +/- 6.3 nm).
• Analysis of cellular damage, DNA integrity, and cell death.
• Investigation of intercellular communication pathways, including connexin and pannexin channels.

Main Results:

• Cobalt-chromium nanoparticles induced DNA damage in fibroblasts without crossing the cellular barrier.
• The damage was mediated by purine nucleotide transmission (e.g., ATP) and intercellular signaling.
• Observed damage differed from direct nanoparticle exposure, with minimal cell death.

Conclusions:

• Indirect effects of nanoparticles are crucial for safety evaluations.
• Intercellular signaling pathways play a significant role in nanoparticle-induced cellular responses.
• Potential risks to tissues behind cellular barriers must be considered for nanoparticle-based therapies.