The Neuropilin-1 Inhibitor, ATWLPPR Peptide, Prevents Experimental Diabetes-Induced Retinal Injury by Preserving Vascular Integrity and Decreasing Oxidative Stress

Neuropilin-1 (NRP-1) is a transmembrane glycoprotein. As a VEGF co-receptor, NRP1 significantly enhances VEGFR2 signaling and promotes vascular permeability and migration. The purpose of this study was to evaluate the effects of an NRP-1 inhibitor, ATWLPPR peptide, on the early stages of diabetic re...

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Veröffentlicht in:PloS one 2015-11, Vol.10 (11), p.e0142571-e0142571
Hauptverfasser: Wang, Jun, Wang, Shuaiwei, Li, Mengling, Wu, Dongdong, Liu, Fang, Yang, Ruisheng, Ji, Shaoping, Ji, Ailing, Li, Yanzhang
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container_title PloS one
container_volume 10
creator Wang, Jun
Wang, Shuaiwei
Li, Mengling
Wu, Dongdong
Liu, Fang
Yang, Ruisheng
Ji, Shaoping
Ji, Ailing
Li, Yanzhang
description Neuropilin-1 (NRP-1) is a transmembrane glycoprotein. As a VEGF co-receptor, NRP1 significantly enhances VEGFR2 signaling and promotes vascular permeability and migration. The purpose of this study was to evaluate the effects of an NRP-1 inhibitor, ATWLPPR peptide, on the early stages of diabetic retinopathy. Eight-week-old male C57BL/6 mice were divided into three groups: a Normal group, a Diabetes (DB) ATWLPPR treatment group and a DB saline group. Electroretinography (ERG), fundus fluorescence angiography (FFA) and leukostasis were examined to evaluate the retinal injury induced by diabetes at the end of the fifth week after STZ injection. Occludin expression and extravasation of albumin were measured to determine the extent of vascular injury. The oxidative stress level and the levels of inflammation-associated proteins were also assayed. The results indicated that treatment with ATWLPPR prevents the abnormal condition of ERG (amplitudes of b-wave decreased and implicit time increased) and vascular injury (occludin degradation and increase in extravasated albumin). These effects were associated with a reduction in the oxidase stress level and the expression of VEGF, GFAP, and ICAM-1. We conclude that ATWLPPR, an NRP-1 inhibitor, may reduce the early retinal damage induced by diabetes by preserving vascular integrity and decreasing the oxidative stress level. Blockade of NRP-1 may be a new therapeutic strategy for the early stages of DR.
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The results indicated that treatment with ATWLPPR prevents the abnormal condition of ERG (amplitudes of b-wave decreased and implicit time increased) and vascular injury (occludin degradation and increase in extravasated albumin). These effects were associated with a reduction in the oxidase stress level and the expression of VEGF, GFAP, and ICAM-1. We conclude that ATWLPPR, an NRP-1 inhibitor, may reduce the early retinal damage induced by diabetes by preserving vascular integrity and decreasing the oxidative stress level. 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As a VEGF co-receptor, NRP1 significantly enhances VEGFR2 signaling and promotes vascular permeability and migration. The purpose of this study was to evaluate the effects of an NRP-1 inhibitor, ATWLPPR peptide, on the early stages of diabetic retinopathy. Eight-week-old male C57BL/6 mice were divided into three groups: a Normal group, a Diabetes (DB) ATWLPPR treatment group and a DB saline group. Electroretinography (ERG), fundus fluorescence angiography (FFA) and leukostasis were examined to evaluate the retinal injury induced by diabetes at the end of the fifth week after STZ injection. Occludin expression and extravasation of albumin were measured to determine the extent of vascular injury. The oxidative stress level and the levels of inflammation-associated proteins were also assayed. 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As a VEGF co-receptor, NRP1 significantly enhances VEGFR2 signaling and promotes vascular permeability and migration. The purpose of this study was to evaluate the effects of an NRP-1 inhibitor, ATWLPPR peptide, on the early stages of diabetic retinopathy. Eight-week-old male C57BL/6 mice were divided into three groups: a Normal group, a Diabetes (DB) ATWLPPR treatment group and a DB saline group. Electroretinography (ERG), fundus fluorescence angiography (FFA) and leukostasis were examined to evaluate the retinal injury induced by diabetes at the end of the fifth week after STZ injection. Occludin expression and extravasation of albumin were measured to determine the extent of vascular injury. The oxidative stress level and the levels of inflammation-associated proteins were also assayed. The results indicated that treatment with ATWLPPR prevents the abnormal condition of ERG (amplitudes of b-wave decreased and implicit time increased) and vascular injury (occludin degradation and increase in extravasated albumin). These effects were associated with a reduction in the oxidase stress level and the expression of VEGF, GFAP, and ICAM-1. We conclude that ATWLPPR, an NRP-1 inhibitor, may reduce the early retinal damage induced by diabetes by preserving vascular integrity and decreasing the oxidative stress level. Blockade of NRP-1 may be a new therapeutic strategy for the early stages of DR.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>26554379</pmid><doi>10.1371/journal.pone.0142571</doi><oa>free_for_read</oa></addata></record>
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subjects Albumin
Angiogenesis
Angiography
Animals
Blood-brain barrier
Brain research
Cell adhesion & migration
Development and progression
Diabetes
Diabetes mellitus
Diabetes Mellitus, Experimental - drug therapy
Diabetes Mellitus, Experimental - metabolism
Diabetic retinopathy
Diabetic Retinopathy - metabolism
Diabetic Retinopathy - prevention & control
Electroretinograms
Electroretinography
Extravasation
Fluorescence
Genetic aspects
Glial fibrillary acidic protein
Glycoproteins
Health aspects
Inflammation
Inhibitors
Injury prevention
Integrity
Intercellular adhesion molecule 1
Male
Membrane proteins
Mice
Mice, Inbred C57BL
Neuropilin
Neuropilin-1 - antagonists & inhibitors
Neuropilin-1 - metabolism
Oligopeptides - pharmacology
Oligopeptides - therapeutic use
Oxidative stress
Oxidative Stress - drug effects
Pathogenesis
Peptides
Permeability
Properties
Proteins
Receptors, Vascular Endothelial Growth Factor - metabolism
Retina
Retinal Vessels - drug effects
Retinal Vessels - metabolism
Retinopathy
Signal transduction
Signaling
Vascular endothelial growth factor
Vascular Endothelial Growth Factor A - metabolism
title The Neuropilin-1 Inhibitor, ATWLPPR Peptide, Prevents Experimental Diabetes-Induced Retinal Injury by Preserving Vascular Integrity and Decreasing Oxidative Stress
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