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A decreasing function describes a relationship where the output consistently declines as the input increases. This means that for any two input values, if one is greater than the other, the corresponding output is smaller. Mathematically, a function f is decreasing on an interval I if for every x1 < x2​ in I, f (x1) > f (x2). This type of behavior is visually identified on a graph that slopes downward from left to right.The nature of a function can be analyzed by calculating...
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Related Experiment Video

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Modeling Hypoxia/Reoxygenation Injury in Proximal Tubular Epithelial Cells
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Hypoxia and IF₁ Expression Promote ROS Decrease in Cancer Cells.

Gianluca Sgarbi1, Giulia Gorini2,3, Francesca Liuzzi4

  • 1Department of Biomedical and Neuromotor Sciences, Laboratory of Biochemistry and Mitochondrial Pathophysiology, University of Bologna, Bologna 40126, Italy. giancarlo.solaini@unibo.it.

Cells
|June 24, 2018
PubMed
Summary

Hypoxia significantly reduces reactive oxygen species (ROS) in cancer cells, with the IF₁ protein influencing ROS levels. Understanding this interplay is crucial for developing novel cancer therapies.

Keywords:
F1F0-ATPaseIF1ROScancer cellshypoxiaosteosarcomasuperoxide radical

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Production and Detection of Reactive Oxygen Species ROS in Cancers
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Area of Science:

  • Cellular Metabolism
  • Cancer Biology
  • Biochemistry

Background:

  • Reactive oxygen species (ROS) play a complex role in cancer metabolic reprogramming under hypoxic conditions.
  • The interplay between ROS and hypoxia in malignancy remains incompletely understood.
  • The endogenous inhibitor protein (IF₁) of ATP synthase is implicated in cancer cell bioenergetics.

Purpose of the Study:

  • To investigate how hypoxia modulates ROS levels in human cancer cells compared to untransformed cells.
  • To determine the involvement of IF₁ in controlling ROS generation under severe hypoxia.
  • To elucidate the relationship between ROS, hypoxia, and IF₁ in cancer.

Main Methods:

  • Exposure of human fibroblasts and 143B osteosarcoma cells to varying hypoxic conditions (0.5% oxygen) for 20 minutes and 24 hours.
  • Quantification of cellular ROS levels using the CellROX fluorescent probe.
  • Measurement of superoxide levels using MitoSOX Red.
  • Comparison of ROS levels in IF₁-expressing and IF₁-silenced cells under normoxic and hypoxic conditions.

Main Results:

  • Hypoxia significantly decreased cellular ROS levels by up to 70% after 20 minutes and to nearly 20% of normoxic levels after 24 hours.
  • IF₁-silenced cells exhibited higher ROS levels compared to IF₁-expressing cells under both normoxia and hypoxia.
  • While superoxide levels also decreased under hypoxia, the reduction was less pronounced than total ROS, with significant differences observed between IF₁-expressing and silenced cells.

Conclusions:

  • Hypoxia induces a significant reduction in cellular ROS, a phenomenon modulated by the IF₁ protein.
  • The findings highlight the complex interplay between ROS, hypoxia, and IF₁ in cancer.
  • This interplay must be considered for the development of effective anti-cancer therapeutic strategies.