Measurement of mitochondrial respiratory thresholds and the control of respiration by nitric oxide.

The methods described serve to illustrate not only the importance of measuring NO. thresholds in mitochondria and cells, but also highlight many of the considerations that must be taken when making such measurements. These include the presence of O2, the source of NO., the precise design of the apparatus, and experimental conditions, such as buffer composition, light level, and temperature. When all these factors are considered, accurate interpretations of the role of NO. in controlling mitochondrial function can be made. Such experiments can provide insight into the intricate nature of the interaction between NO. and mitochondria and the variations in this system that can occur under both physiological and pathological conditions.