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Effect of smoking cessation on mitochondrial respiratory chain function
Francesc Cardellach1, Josep R Alonso, Sònia López
1Mitochondrial Research Laboratory, Muscle Research Unit, Department of Internal Medicine, August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Hospital Clínic, School of Medicine, University of Barcelona, Barcelona, Catalonia, Spain.
Journal of Toxicology. Clinical Toxicology
|June 17, 2003
Summary
Smoking cessation restores mitochondrial function in lymphocytes, specifically improving complex IV and III activities. This indicates that quitting smoking can reverse some harmful effects on cellular energy production.
Area of Science:
- Mitochondrial physiology
- Cellular respiration
- Toxicology of smoking
Background:
- Chronic smoking is linked to mitochondrial respiratory chain (MRC) dysfunction, particularly complex IV inhibition.
- This dysfunction may contribute to diseases associated with tobacco use.
Purpose of the Study:
- To assess mitochondrial respiratory chain function in lymphocytes of heavy smokers after smoking cessation.
- To determine if MRC function recovers post-cessation.
Main Methods:
- Peripheral lymphocytes from 10 smokers were analyzed before and after smoking cessation (7 and 28 days).
- MRC function was measured via enzyme activities (complex II, III, IV) and polarographic oxygen consumption.
- Citrate synthase activity was used for normalization.
Main Results:
- Smokers exhibited significantly reduced complex IV activity and lymphocyte respiration compared to controls.
- Smoking cessation led to a significant recovery of complex IV and complex III activities.
- No significant changes were observed in overall oxidative activities.
Conclusions:
- Chronic smoking impairs mitochondrial respiratory chain complexes IV and III activity.
- Cessation of tobacco smoking allows for the recovery of these mitochondrial functions to normal levels.