Protective effect of MSC-derived exosomes against cisplatin-induced apoptosis via heat shock protein 70 in auditory explant model

Therapeutics based on stem cell technology, including stem cell-derived exosomes, have emerged in recent years for the treatment of what were otherwise considered incurable diseases. In this study, we evaluated the efficacy of human MSC-derived exosomes for protection against cisplatin induced ototoxic hearing loss. Incubation of cochlear explants with MSC-derived exosomes prior to addition of cisplatin induced a reduction in cisplatin-induced drug toxicity in auditory hair cells but not when the exosomes were introduced simultaneously with or after cisplatin. The delivery of MSC-derived exosomes to cochlear explants was confirmed by the increasing protein levels of the exosome markers CD63 and HSP70 to reduce apoptosis. These results were consistent with those from a model in which MSC-derived exosomes protect auditory hair cells from cisplatin-induced drug toxicity in an ex vivo cochlear explant model and support future studies into the therapeutic benefits of stem cell-derived exosomes in clinical applications.