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Supplementation with vitamins C and E improves mouse lung repair.
Samuel Santos Valenca1, Frank Silva Bezerra, Bruna Romana-Souza
1Tissue Repair Laboratory, Histology and Embryology Department, Roberto Alcântara Gomes Institute of Biology, State University of Rio de Janeiro, 20550-170 Rio de Janeiro, Brazil.
The Journal of Nutritional Biochemistry
|December 25, 2007
Summary
Vitamins C and E may aid lung repair in mice with emphysema caused by cigarette smoke (CS). Supplementation reduced inflammation and preserved lung tissue structure, suggesting a potential therapeutic role.
Area of Science:
- Pulmonary Medicine
- Toxicology
- Nutritional Science
Background:
- Cigarette smoke (CS) is a primary cause of emphysema, leading to lung tissue destruction via oxidants and matrix metalloproteinases (MMPs).
- The potential for lung repair following CS-induced emphysema remains poorly understood.
- Understanding repair mechanisms is crucial for developing effective therapeutic strategies.
Purpose of the Study:
- To investigate the effects of combined vitamin C and vitamin E supplementation on lung repair in a mouse model of emphysema.
- To evaluate biochemical markers of oxidative stress, inflammation, and tissue remodeling.
- To assess histological changes in lung tissue after CS exposure and vitamin treatment.
Main Methods:
- Male C57BL/6 mice were exposed to CS for 60 days to induce emphysema.
- Control mice were sham-smoked.
- Post-exposure, mice received either saline/olive oil (vehicle) or vitamins C and E (50 mg/kg/day) for 60 days.
- Lung homogenates, bronchoalveolar lavage (BAL) fluid, and lung histology were analyzed.
Main Results:
- CS exposure led to decreased catalase (CAT) activity and increased superoxide dismutase (SOD) activity in the CSv group.
- The CSv group exhibited higher neutrophil counts in BAL fluid and elevated tumor necrosis factor-alpha (TNF-alpha) levels.
- Histological analysis revealed reduced collagen and elastic fibers in the CSv group compared to controls and the vitamin-treated group (CSr).
Conclusions:
- Vitamin C and E supplementation in mice with CS-induced emphysema showed a potential role in lung repair.
- Supplementation appeared to mitigate some inflammatory responses and preserve lung structural components.
- These findings suggest that vitamins C and E could be beneficial in managing emphysema associated with cigarette smoke exposure.
