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Vacuole-inducing compounds that disrupt endolysosomal trafficking stimulate production of exosomes by glioblastoma cells.
Molecular and Cellular Biochemistry 2018 Februrary
Exosomes are produced from mammalian cells when multivesicular endosomes fuse with the plasma membrane, releasing their intralumenal vesicles. In this study we assessed the effects of MOPIPP, a novel indole-based chalcone, and vacuolin-1, a distinct triazine-based compound, on exosome production in cultured glioblastoma and 293T cells. Both compounds promote vacuolization of late endosome compartments and interfere with trafficking of late endosomes to lysosomes, without significant cytotoxicity. The results show that vacuolated cells treated with these compounds release exosomes with morphologies similar to untreated controls. However, both compounds trigger multi-fold increases in release of exosome marker proteins (e.g., CD63, Alix) in exosome fractions collected from equivalent numbers of cells. Despite the marked increase in exosome production, the profiles of selected miRNA cargoes carried by the exosomes were generally similar in cells treated with the compounds. Insofar as MOPIPP and vacuolin-1 seem able to increase the overall yield of exosomes from cultured cells, they might be useful for efforts to develop exosome-based therapeutics.
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