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Proteomic Profiling of Sweat Exosome Suggests its Involvement in Skin Immunity.
Journal of Investigative Dermatology 2018 January
Healthy human skin sustains an effective immune defense mechanism, formed by a complex physical and chemical epidermal barrier that coordinates with different cellular components of the skin immune system. However, the mechanism by which skin cells regulate local immune homeostasis in health and disease contexts is not well known. To investigate whether exosomes exist in sweat, sweat samples from healthy individuals were collected after aerobic exercise. Sweat exosome was isolated via differential ultracentrifugation, observed under transmission electron microscopy, measured by dynamic light scattering, and confirmed by immunoblot. Further, shotgun liquid chromatography (LC)-mass spectrometry (MS)/MS analysis was conducted to investigate the proteomic profiling of sweat exosome. Secreted exosome was detected in human sweat. A total of 1,062 proteins were identified in sweat exosome, including 997 different proteins compared with sweat proteomics and 896 unique proteins compared with urine, saliva, and plasma exosomes. Diverse antimicrobial peptides and immunological factors were found in sweat exosome, suggesting the involvement of exosome in skin immunity. This study provides direct evidence that secreted exosomes exist in human sweat. The proteomic profiling of sweat exosome provides insight into sweat features and the potential physiological significance of exosomes in immune homeostasis.
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