Intercellular transfer of mitochondria and mitochondrial components through extracellular vesicles (EVs), including microvesicles and exosomes, is an area of intense interest. The cargos that are carried by EVs define their biological activities. Mitochondria are in charge of bioenergetics and maintenance of cell viability. Increasing evidences indicate the presence of intact mitochondria or mitochondrial components in EVs, which raises many questions, how they are engulfed into EVs and what do they do? Here, we present what is currently known about the presence and function of various mitochondrial constituent in EVs. We also review current understanding about how and why mitochondrial components are encapsulated into EVs.
