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Published on: December 3, 2012
Suspended animation-like state protects mice from lethal hypoxia
1Molecular and Cellular Biology Program, University of Washington, Seattle, Washington, USA.
Shock (Augusta, Ga.)
|April 7, 2007
Summary
Hydrogen sulfide (H2S) pretreatment induces a suspended animation-like state in mice, significantly reducing oxygen demand. This allows mice to survive prolonged exposure to low oxygen levels, preventing hypoxia-related damage.
Area of Science:
- Biochemistry
- Physiology
- Toxicology
Background:
- High oxygen levels accelerate metabolic rates, potentially leading to cellular damage.
- Sulfide, a natural cellular reducer, may buffer oxygen consumption.
- Hydrogen sulfide (H2S) is endogenously produced and has known physiological effects.
Purpose of the Study:
- To investigate the hypothesis that sulfide acts as a buffer against unrestricted oxygen consumption.
- To determine if hydrogen sulfide (H2S) pretreatment can protect mice from hypoxia.
- To explore the potential of H2S in mitigating hypoxia-induced damage.
Main Methods:
- Mice (Mus musculus) were pretreated with hydrogen sulfide (H2S).
- Metabolic rates were measured following H2S administration.
- Mice were exposed to varying low oxygen conditions (5% and 3% oxygen) after H2S pretreatment.
- Survival times and physiological effects were monitored.
Main Results:
- H2S pretreatment decreased mouse metabolic rate by approximately 90%, inducing a suspended animation-like state.
- Mice pretreated with H2S survived over 6.5 hours in 5% oxygen, compared to less than 20 minutes for controls.
- Pretreated mice survived several hours at oxygen tensions as low as 3%.
Conclusions:
- H2S pretreatment effectively reduces oxygen demand, enabling survival under severe hypoxic conditions.
- This protective effect suggests H2S may be a valuable therapeutic agent for preventing hypoxia-associated tissue damage.
- Sulfide acts as a physiological buffer, mitigating the adverse effects of excessive oxygen consumption.
