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L Yuan1,2, T Gao1,2, H He1,2

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Silver ions (Ag+) are toxic to mitochondria, damaging their structure and function. This research highlights potential hazards of silver nanomaterials at the sub-cellular level, impacting their biological applications.

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Area of Science:

  • Biochemistry
  • Toxicology
  • Nanomaterials Science

Background:

  • Silver (Ag+) is widely used in biomaterials, but its sub-cellular toxicity is poorly understood.
  • Ag+ is known to interact with cellular components like DNA and proteins.
  • Understanding Ag+ effects at the mitochondrial level is crucial for safety assessments.

Purpose of the Study:

  • To investigate the toxicity of Ag+ on isolated rat liver mitochondria.
  • To examine the impact of Ag+ on mitochondrial morphology, respiration, swelling, membrane fluidity, and reactive oxygen species (ROS) generation.

Main Methods:

  • Isolation of mitochondria from rat livers.
  • Assessment of mitochondrial structure and function through various assays.
  • Measurement of reactive oxygen species (ROS) production.

Main Results:

  • Ag+ significantly altered mitochondrial morphology and function.
  • Observed mitochondrial swelling, collapse of transmembrane potential, and altered membrane fluidity.
  • Decreased respiratory rate and accelerated ROS generation were noted, suggesting nonspecific injury.

Conclusions:

  • Ag+ poses a significant toxic risk to mitochondria, affecting structure and function.
  • Mitochondrial injury by Ag+ appears to be a nonspecific process.
  • Findings necessitate careful consideration for the biological and medical applications of silver-based materials.