Reduced vascular leakage and membrane attack complex (MAC) formation after intravitreal application of polySia avDP20 in mice with retinal laser lesion.

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Reduced vascular leakage and membrane attack complex (MAC) formation after intravitreal application of polySia avDP20 in mice with retinal laser lesion Reduced vascular leakage and membrane attack complex (MAC) formation after intravitreal application of polySia avDP20 in mice with retinal laser lesion Fundus fluorescein angiography was performed 48 h after laser coagulation and intravitreal application of low (0.2 μg) and high (3 μg) dose of polySia avDP20 or PBS vehicle. Late‐stage (10–11 min after fluorescein injection) fundus fluorescein angiography revealed that PBS‐treated wild‐type controls and humanized SIGLEC11 mice showed normal levels of vessel leakage, whereas polySia avDP20‐treated SIGLEC11 transgenic (tg) mice had lower levels of vessel leakage compared to PBS‐injected wild‐type or SIGLEC11 tg mice. High polySia avDP20 dose reduced vascular leakage also in wild‐type animals. Representative images out of at least eight independent experiments are shown.Fundus fluorescein angiography pictures were exported from Heidelberg Eye Explorer Software, and fluorescein leakage was quantified with ImageJ software (NIH). Pixel intensities of six regions of interest per picture were quantified, and background fluorescence was subtracted. PolySia avDP20‐treated SIGLEC11 tg animals showed reduced vascular leakage compared to PBS‐injected wild‐type control and SIGLEC11 tg mice. A reduction in vascular leakage was also observed in high‐dose polySia avDP20‐injected wild‐type control mice. Data show mean ± SD. WT PBS (n = 20 eyes), WT 0.2 μg Sia (n = 17 eyes), WT 3 μg Sia (n = 9 eyes), SIGLEC11 tg PBS (n = 16 eyes), SIGLEC11 tg 0.2 μg Sia (n = 20 eyes), SIGLEC11 tg 3 μg Sia (n = 15 eyes); WT PBS vs. WT 3 μg Sia *P = 0.0193, WT 0.2 μg Sia vs. SIGLEC11 tg 0.2 μg Sia ***P < 0.0001, SIGLEC11 tg PBS vs. SIGLEC11 tg 0.2 μg Sia ***P < 0.0001, SIGLEC11 tg PBS vs. SIGLEC11 tg 3 μg Sia ***P = 0.0002, one‐way ANOVA followed by Fisher's LSD.Anti‐C5b‐9 immunostaining of RPE/choroid whole mount preparations 48 h after laser damage showed strong MAC deposition in the laser lesions of vehicle‐injected controls. PolySia avDP20 treatment reduced MAC formation in a dose‐dependent fashion independent of SIGLEC11 presence. Scale bar: 100 μm.Quantification of C5b‐9 fluorescence signal intensity in the laser lesions. In comparison with the high amount of MAC deposition in vehicle‐injected controls, the pixel intensity is reduced in polySia avDP20‐treated eyes in a dose‐dependent fashion and regardless of SIGLEC11 presence. Data show mean ± SD. WT PBS (n = 12 laser spots), WT 0.2 μg Sia (n = 12 laser spots), WT 3 μg Sia (n = 7 laser spots), SIGLEC11 tg PBS (n = 6 laser spots), SIGLEC11 tg 0.2 μg Sia (n = 10 laser spots), SIGLEC11 tg 3 μg Sia (n = 12 laser spots); all statistical comparisons ***P < 0.0001 except SIGLEC11 tg PBS versus SIGLEC11 tg 0.2 μg Sia ***P = 0.0004, one‐way ANOVA followed by Fisher's LSD. Marcus Karlstetter et al. EMBO Mol Med. 2017;9:154-166 © as stated in the article, figure or figure legend