TMEM-mediated vascular permeability is transient and localized.

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Presentation transcript:

TMEM-mediated vascular permeability is transient and localized. TMEM-mediated vascular permeability is transient and localized. A, time-lapse imaging demonstrates that laser-induced damage to the endothelium creates a hole allowing for extravasation of 155-kDa dextran–TMR. The location of the hole is marked by a white dot (2 μm) and a yellow arrowhead. 155-kDa dextran–TMR extravasates and increases over time up to 60′ filling the field of view and not clearing from the tissue (n = 4). Scale bar, 50 μm. B, 155-kDa dextran–TMR is injected by tail vein i.v. catheter followed by 8 μg of VEGFA165 at 0′. VEGFA165 induces blood vessel permeability in all of the blood vessels in the field of view. Peak extravascular dextran is observed at 20′ followed by clearance by 60′ after resealing of vascular junctions (n = 4). Scale bar, 50 μm. C, spontaneous vascular permeability at the TMEM is both transient and local. Local peak extravasation of 155-kDa dextran–TMR occurs after 20′ (yellow arrowhead) and clears within 60′ (n = 11). Scale bar, 50 μm. D, quantification of average relative intensity of extravascular 155-kDa dextran–TMR after () laser damage (n = 4), () intravenous VEGFA165 (n = 4), and () spontaneous permeability (n = 11). E, table of parameters from curve fitting to an Exponentially Modified Gaussian function using data from D. F, quantification of total extravascular 155-kDa dextran–TMR area after laser-induced damage, i.v. injection of VEGFA165, or spontaneous permeability at the TMEM from individual animals represented in A, B, and C. Peak of 155-kDa dextran–TMR area in spontaneous permeability at the TMEM indicated with a red arrowhead. , laser damage; , intravenous VEGFA165; , spontaneous vascular permeability at the TMEM. Allison S. Harney et al. Cancer Discovery 2015;5:932-943 ©2015 by American Association for Cancer Research