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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
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Structure-dependent mitochondrial dysfunction and hypoxia induced with single-walled carbon nanotubes.

Li-Rong Wang1, Xue Xue, Xiao-Mei Hu

  • 1Chinese Academy of Sciences Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology of China, Beijing, 100190, China.

Small (Weinheim an Der Bergstrasse, Germany)
|March 29, 2014
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Summary

This study sorts single-walled carbon nanotubes (SWNTs) by structure, revealing that aggregated SWNTs with poor integrity increase reactive oxygen species (ROS), while integral aggregated SWNTs impact mitochondrial function and hypoxia.

Keywords:
hypoxiamitochondrial dysfunctionsingle-walled carbon nanotubesstructure-dependent

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Area of Science:

  • Nanomaterial science
  • Toxicology
  • Biophysics

Background:

  • Nanomaterial cytotoxicity depends on physicochemical properties like size and shape.
  • Understanding structure-bioeffect relationships requires well-characterized nanomaterial subpopulations.
  • Single-walled carbon nanotubes (SWNTs) are widely studied but require precise characterization.

Purpose of the Study:

  • To develop a scalable method for sorting SWNTs into distinct structural fractions.
  • To investigate the structure-dependent cytotoxicity of SWNTs on cellular functions.
  • To establish clearer structure-bioeffect correlations for nanomaterial risk assessment.

Main Methods:

  • Scalable density gradient ultracentrifugation for SWNT separation.
  • Sorting based on diameter, aggregation, and structural integrity.
  • Assessment of mitochondrial function, hypoxia, ROS levels, and apoptosis-related proteins.

Main Results:

  • Four distinct SWNT fractions were successfully isolated with high yield and stability.
  • Singly-dispersed integral SWNTs showed no significant effects on mitochondrial function or hypoxia.
  • Aggregated integral SWNTs induced mitochondrial dysfunction and hypoxia, while aggregated SWNTs with poor integrity elevated ROS levels.

Conclusions:

  • SWNT structural characteristics significantly influence bioeffects and cytotoxicity.
  • Control over SWNT structure is crucial for accurate health risk assessment.
  • These findings aid in designing safer and more effective nanomaterials for subcellular applications.