We performed HUVEC migration assay by a transwell chamber with 8 μm pore size (BD Biosciences, USA). The upper chamber was plated with 1 × 105 HUVECs suspended in serum-free DMEM, and the bottom chamber was added with 600 μl hAEC-CM. After 24 hours, we fixed the filters with 10% formalin, stained them with 0.1% crystal violet (Sigma, USA), and then counted the migrated cells by Leica QWin image analysis software. Complete medium was treated as a positive control medium, and serum-free high-glucose DMEM was used as a negative control medium.
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