Abstract
Extracellular vesicles (EVs) are recognized as major vehicles for exchange of information across distant cells and tissues, which have been extensively explored for diagnosis and therapeutic purposes. The presence of multiple connexin (Cx) proteins has been described in EVs, where they might facilitate EV-cell communication. However, quantitative changes in Cx levels and functional assessment of Cx channels have only been established for Cx43. In present work, we provide a detailed description of the protocols we have optimized to assess the expression and permeability of Cx43 channels in EVs derived from cultured cells and human peripheral blood. Particularly, we include some modifications to improve quantitative analysis of EV-Cx43 by enzyme-linked immunosorbent assay (ELISA) and assessment of channel functionality by sucrose-density gradient ultracentrifugation, which can be easily adapted to other Cx family members, leveraging the development of diagnostic and therapeutic applications based on Cx-containing EVs.
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