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Cerani, Agustin; Tetreault, Nicolas; Menard, Catherine; Lapalme, Eric; Patel, Chintan; Sitaras, Nicholas; Beaudoin, Felix; Leboeuf, Dominique; De Guire, Vincent; Binet, François; Dejda, Agnieszka; Rezende, Flavio A.; Miloudi, Khalil; Sapieha, Przemyslaw
Cell metabolism, 10/2013, Letnik: 18, Številka: 4Journal Article
The deterioration of the inner blood-retinal barrier and consequent macular edema is a cardinal manifestation of diabetic retinopathy (DR) and the clinical feature most closely associated with loss of sight. We provide evidence from both human and animal studies for the critical role of the classical neuronal guidance cue, semaphorin 3A, in instigating pathological vascular permeability in diabetic retinas via its cognate receptor neuropilin-1. We reveal that semaphorin 3A is induced in early hyperglycemic phases of diabetes within the neuronal retina and precipitates initial breakdown of endothelial barrier function. We demonstrate, by a series of orthogonal approaches, that neutralization of semaphorin 3A efficiently prevents diabetes-induced retinal vascular leakage in a stage of the disease when vascular endothelial growth factor neutralization is inefficient. These observations were corroborated in TgCre-Esr1/Nrp1flox/flox conditional knockout mice. Our findings identify a therapeutic target for macular edema and provide further evidence for neurovascular crosstalk in the pathogenesis of DR. Display omitted •The guidance cue semaphorin 3A is induced in the early phases of diabetes in the retina•Semaphorin 3A instigates pathological vascular permeability in diabetes via NRP-1•Neutralization of semaphorin 3A prevents retinal vascular leakage in diabetes
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