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Trolox attenuates mechanical ventilation-induced diaphragmatic dysfunction and proteolysis
Jenna L Betters1, David S Criswell, R Andrew Shanely
1Department of Applied Physiology and Kinesiology, Center for Exercise Science, University of Florida, Gainesville, FL 32611, USA.
American Journal of Respiratory and Critical Care Medicine
|September 18, 2004
Summary
Antioxidant infusion, like Trolox, can prevent diaphragm muscle damage and loss of function caused by prolonged mechanical ventilation. This therapy helps maintain muscle health during critical care.
Area of Science:
- Physiology
- Biochemistry
- Critical Care Medicine
Background:
- Prolonged mechanical ventilation causes diaphragm oxidative injury, proteolysis, atrophy, and reduced force.
- Oxidative stress is implicated in ventilator-induced diaphragm dysfunction.
Purpose of the Study:
- To test if antioxidant infusion during mechanical ventilation prevents diaphragm oxidative stress, proteolysis, and contractile dysfunction.
- To evaluate the efficacy of Trolox in mitigating ventilator-induced diaphragm injury.
Main Methods:
- Rats were mechanically ventilated for 12 hours with or without intravenous Trolox infusion.
- Diaphragmatic force, proteolysis, and 20S proteasome activity were measured and compared to controls.
Main Results:
- Mechanical ventilation reduced diaphragmatic force by 17%, which Trolox completely prevented.
- Ventilation increased diaphragmatic proteolysis by 105% and 20S proteasome activity by 76%; Trolox attenuated these increases.
- Trolox treatment prevented proteolysis and contractile deficits in ventilated animals.
Conclusions:
- Mechanical ventilation-induced oxidative stress is a key regulator of diaphragm proteolysis and contractile dysfunction.
- Antioxidant therapy, such as Trolox, may be beneficial in preventing diaphragm injury during prolonged mechanical ventilation.
- Findings support antioxidant treatment strategies for patients requiring mechanical ventilation.