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Exosomes are derived from various sources, including primary and cultured cell lines and body fluids. It is now evident that they are important for communication between cells. They have, therefore, been proposed as potential carriers to deliver drugs to specific sites. In this study, we examined stability of exosomes derived from human saliva. Exosomes were stored at 4°C for up to 20 months and their membrane integrity assessed. Several exosomal markers, such as dipeptidyl peptidase IV (DPP IV; membrane marker) and programmed cell death 6-interacting protein (Alix, lumen marker), were retained intact after 20 months storage at 4°C. Moreover, intact exosomes could be isolated from whole saliva that had been stored at 4°C. Membrane disruption with detergents such as Triton X-100 and Nonidet P-40 caused partial solubilization of DPP IV and release of Alix into the supernatant. In contrast, sodium dodecyl sulfate treatment caused a complete disruption of the membrane. In addition, membrane stability was maintained after freezing and thawing. These results indicated that human saliva-derived exosomes are stable, maintaining their membrane integrity over a long storage period.

Characterization of Membrane Integrity and Morphological Stability of Human Salivary Exosomes