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Reactive oxygen species facilitate oxygen sensing
Nanduri R Prabhakar1, Ying-Jie Peng, Guoxiang Yuan
1Department of Physiology and Biophysics, School of Medicine, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106, USA.
Novartis Foundation Symposium
|May 12, 2006
Summary
Chronic intermittent hypoxia (IH) enhances carotid body (CB) oxygen sensing via reactive oxygen species (ROS). This study reveals ROS as key mediators in CB plasticity, impacting physiological responses to hypoxia.
Area of Science:
- Physiology
- Neuroscience
- Biochemistry
Background:
- Reactive oxygen species (ROS) act as signaling molecules in physiological processes.
- Carotid body (CB) chemoreceptors are crucial in intermittent hypoxia (IH) pathophysiology.
- The role of ROS in CB oxygen sensing during IH requires further investigation.
Purpose of the Study:
- To investigate the role of ROS in CB oxygen sensing under chronic IH conditions.
- To explore the mechanisms underlying IH-induced plasticity in CB activity.
- To determine if ROS mediate the facilitation of serotonin release by hypoxia.
Main Methods:
- Utilized a rodent model of chronic IH.
- Administered superoxide dismutase (SOD) mimetic and hydrogen peroxide (H2O2).
- Measured CB activity, ROS levels, and serotonin (5-HT) release; inhibited mitochondrial complex I and 5-HT receptors.
Main Results:
- Chronic IH augmented hypoxic sensory response and induced sensory long-term facilitation (LTF).
- SOD mimetic prevented IH-induced CB changes; H2O2 mimicked these effects.
- Elevated ROS levels and increased mitochondrial complex I inhibition were observed in IH animals.
- Chronic IH enhanced hypoxia-induced 5-HT release via ROS-dependent pathways.
Conclusions:
- Chronic IH enhances CB oxygen sensing through increased ROS generation in chemoreceptor tissue.
- ROS act as critical mediators in the functional plasticity of the CB.
- These findings elucidate ROS-dependent mechanisms in hypoxic signaling and CB adaptation.