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Buthionine sulfoximine treatment impairs rat diaphragm function
C F Morales1, A Anzueto, F Andrade
1Division of Pulmonary Diseases/Critical Care Medicine, University of Texas Health Science Center at San Antonio 78284-7885.
Summary
Glutathione (GSH) depletion impairs diaphragm function during resistive breathing. BSO treatment, which lowers GSH, exacerbated diaphragm weakness when combined with inspiratory resistive loading, highlighting GSH
Area of Science:
- Physiology
- Biochemistry
- Respiratory Medicine
Background:
- The diaphragm's glutathione (GSH) redox cycle activates during inspiratory resistive loading (RB).
- Buthionine sulfoximine (BSO) inhibits GSH synthesis, lowering tissue GSH levels.
Purpose of the Study:
- To investigate the impact of GSH depletion via BSO on rat diaphragm function at rest and during RB.
- To determine if GSH plays a protective role against respiratory stress.
Main Methods:
- Rats underwent inspiratory RB until respiratory failure.
- BSO was administered to deplete diaphragmatic GSH.
- In vitro diaphragm contractile properties (Po, Pt, force-frequency) were measured.
Main Results:
- BSO treatment significantly depleted diaphragmatic GSH.
- Neither BSO nor RB alone altered diaphragm function.
- Combined BSO and RB treatment resulted in significant decreases in Pt, Po, and tetanic tension.
Conclusions:
- GSH depletion exacerbates diaphragm impairment under inspiratory resistive loading.
- These findings suggest GSH is crucial for protecting the diaphragm against respiratory stress.