Abstract
Mitochondria are the organelles where the most fundamental processes of energy transformation within the cell are located. They are also involved in several processes like apoptosis and autophagy, reactive oxygen species formation, and calcium signaling, which are crucial for proper cell functioning. In addition, mitochondrial genome hosts genes encoding important proteins incorporated in respiratory chain complexes and indispensable for the oxidative phosphorylation. Studying isolated mitochondria is, therefore, crucial for better understanding of cell physiology. The presented protocol describes a relatively simple and handy method for crude mitochondrial fraction isolation from different mammalian cell lines. It includes mechanical cells disruption (homogenization) and differential centrifugation. In addition, this chapter presents two basic ways to assess mitochondrial functionality: by measuring mitochondrial inner membrane potential and coupled respiration.
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