Related Experiment Videos
Hypoxic pulmonary vasoconstriction: redox events in oxygen sensing
Gregory B Waypa1, Paul T Schumacker
1Dept. of Medicine MC6026, The University of Chicago, 5841 South Maryland Ave., Chicago, IL 60637, USA.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|December 14, 2004
Summary
Mitochondria's role in oxygen sensing for hypoxic pulmonary vasoconstriction is debated. Two models propose opposite mitochondrial reactive oxygen species (ROS) signaling pathways affecting calcium channels and cell contraction.
Area of Science:
- Cellular physiology
- Mitochondrial function
- Cardiovascular research
Background:
- Mitochondria are central to oxygen sensing in hypoxic pulmonary vasoconstriction (HPV).
- Two conflicting models explain mitochondrial responses to decreased oxygen (hypoxia).
Purpose of the Study:
- To review and compare two divergent models of mitochondrial function in hypoxia.
- To elucidate the role of mitochondrial reactive oxygen species (ROS) in HPV.
Main Methods:
- Literature review and synthesis of existing research on mitochondrial signaling in hypoxia.
- Analysis of two proposed models for mitochondrial oxygen sensing.
Main Results:
- Model 1: Hypoxia decreases mitochondrial ROS, leading to a reduced cytosol, channel inhibition, and calcium influx.
- Model 2: Hypoxia paradoxically increases mitochondrial ROS, causing an oxidized cytosol, calcium release, and contraction.
Conclusions:
- Mitochondrial ROS signaling is implicated in both proposed HPV mechanisms.
- Further research is needed to reconcile these disparate models of mitochondrial oxygen sensing.