Related Experiment Videos
A novel lung slice system with compromised antioxidant defenses
S J Hardwick1, A Adam, L L Smith
1Department of Pharmacology, University of London, UK.
Environmental Health Perspectives
|April 1, 1990
Summary
Researchers developed a rat lung slice model with weakened antioxidant defenses to study oxidative stress. This model, inhibited by BCNU, maintained viability and stability for further research on lung tissue damage.
Area of Science:
- Biochemistry
- Toxicology
- Pulmonary Medicine
Background:
- Oxidative stress significantly impacts lung tissue function and integrity.
- Studying oxidative stress mechanisms in lung tissue requires a stable and reliable experimental model.
- Existing models may not fully capture the complexities of antioxidant defense impairment in vivo.
Purpose of the Study:
- To establish a rat lung slice model with compromised antioxidant defenses for studying oxidative stress.
- To evaluate the stability and viability of this model following induced antioxidant impairment.
- To assess the utility of this model for investigating the effects of various oxidative agents on lung tissue.
Main Methods:
- Preparation of rat lung slices with impaired antioxidant defenses using 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU).
- Incubation of lung slices with BCNU to inhibit glutathione reductase and assess effects on nonprotein sulfhydryls (NPSH), ATP, NADP+, and NADPH.
- Evaluation of cell viability by measuring 14CO2 evolution from D-[14C(U)]-glucose.
- Exposure of the compromised lung slice model to oxidative agents like paraquat, nitrofurantoin, and 2,3-dimethoxy-1,4-naphthoquinone.
Main Results:
- BCNU induced near-maximal, irreversible inhibition of glutathione reductase (approx. 85%) with only a modest decrease in NPSH (approx. 15%).
- Intracellular ATP, NADP+, and NADPH levels remained unaltered post-BCNU treatment.
- The compromised lung slice system demonstrated stable viability and metabolic activity over a 4-hour period, comparable to control slices.
- Preliminary data were obtained on the effects of paraquat, nitrofurantoin, and 2,3-dimethoxy-1,4-naphthoquinone using this model.
Conclusions:
- A rat lung slice model with impaired antioxidant defenses, specifically glutathione reductase inhibition, was successfully established.
- This model exhibits stability and viability, making it suitable for investigating oxidative stress in lung tissue.
- The model provides a valuable tool for preliminary studies on the effects of various oxidative agents on lung tissue.