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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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Assessing Energy Substrate Oxidation In Vitro with 14CO2 Trapping
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Cartilage Redox Balance Is Influenced by Substrate Availability.

Jingyi Wang1, Corinne R Henak1,2,3

  • 1Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI, USA.

Cartilage
|September 19, 2025
PubMed
Summary
This summary is machine-generated.

Altered substrate availability, including low oxygen or high glucose with glutamine, enhances cartilage

Keywords:
cartilageglucoseglutamineoptical redox imagingoxygen tension

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Area of Science:

  • Biochemistry
  • Biomechanical Engineering
  • Cell Biology

Background:

  • Cartilage's mechanobiological response is crucial for joint health.
  • Redox balance plays a key role in cellular responses to mechanical stress.
  • Metabolic substrate availability may influence cartilage's response to mechanical loading.

Purpose of the Study:

  • To investigate how glucose, glutamine, and oxygen affect cartilage's mechanoresponsiveness.
  • To examine the impact of metabolic substrates on cartilage redox balance under mechanical load.
  • To utilize label-free imaging of endogenous redox cofactors for quantitative analysis.

Main Methods:

  • Utilized a label-free imaging technique to measure autofluorescence.
  • Measured autofluorescence from endogenous redox cofactors (NADH/NADPH and FAD).
  • Applied sub-failure tensile mechanical load to cartilage explants cultured under varying substrate conditions.

Main Results:

  • Low oxygen tension increased autofluorescence intensity (FAD) post-loading compared to room oxygen.
  • High glucose with glutamine significantly increased autofluorescence (FAD and NADH/NADPH) post-loading.
  • Glutamine partially substituted for glucose in maintaining redox cofactor levels under mechanical stress.

Conclusions:

  • Low oxygen and high glucose with glutamine enhance cartilage's mechanoresponsive redox balance.
  • Substrate availability significantly modulates cartilage's response to mechanical loading.
  • Glutamine plays a role in supporting cartilage redox homeostasis, potentially as a glucose alternative.