Exosomal Cx43 enhances the migration ability of U251s cells. (A) Wound healing experiments were performed to evaluate the migration of U251s cells at 0, 24 and 48 h after treatment with PBS, sExo, rExo and rExo + 37,43Gap27. Scale bar, 200 µm. (B) Wound closure rate was measured using ImageJ software for statistical analysis. Data represent the results of at least three independent experiments for each group. **P<0.01, ***P<0.001. (C) Transwell assay was used to examine the migration of U251s cells after treatment with PBS, sExo, rExo and rExo + 37,43Gap27. Scale bar, 200 µm. (D) The migrated U251s cells were counted in at least 9 fields from three independent experiments for each treatment. **P<0.01. Cx43, connexin 43; U251r, temozolomide-resistant U251 glioma cells; U251s, temozolomide-sensitive U251 glioma cells; sExo, exosomes of U251s cells; rExo, exosomes of U251r cells.