Differential modulation of retinal degeneration by Ccl2 and Cx3cr1 chemokine signalling

Microglia and macrophages are recruited to sites of retinal degeneration where local cytokines and chemokines determine protective or neurotoxic microglia responses. Defining the role of Ccl2-Ccr2 and Cx3cl1-Cx3cr1 signalling for retinal pathology is of particular interest because of its potential r...

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Veröffentlicht in:PloS one 2012-04, Vol.7 (4), p.e35551
Hauptverfasser: Luhmann, Ulrich F O, Lange, Clemens A, Robbie, Scott, Munro, Peter M G, Cowing, Jill A, Armer, Hannah E J, Luong, Vy, Carvalho, Livia S, MacLaren, Robert E, Fitzke, Frederick W, Bainbridge, James W B, Ali, Robin R
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container_title PloS one
container_volume 7
creator Luhmann, Ulrich F O
Lange, Clemens A
Robbie, Scott
Munro, Peter M G
Cowing, Jill A
Armer, Hannah E J
Luong, Vy
Carvalho, Livia S
MacLaren, Robert E
Fitzke, Frederick W
Bainbridge, James W B
Ali, Robin R
description Microglia and macrophages are recruited to sites of retinal degeneration where local cytokines and chemokines determine protective or neurotoxic microglia responses. Defining the role of Ccl2-Ccr2 and Cx3cl1-Cx3cr1 signalling for retinal pathology is of particular interest because of its potential role in age-related macular degeneration (AMD). Ccl2, Ccr2, and Cx3cr1 signalling defects impair macrophage trafficking, but have, in several conflicting studies, been reported to show different degrees of age-related retinal degeneration. Ccl2/Cx3cr1 double knockout (CCDKO) mice show an early onset retinal degeneration and have been suggested as a model for AMD. In order to understand phenotypic discrepancies in different chemokine knockout lines and to study how defects in Ccl2 and/or Cx3cr1 signalling contribute to the described early onset retinal degeneration, we defined primary and secondary pathological events in CCDKO mice. To control for genetic background variability, we compared the original phenotype with that of single Ccl2, Cx3cr1 and Ccl2/Cx3cr1 double knockout mice obtained from backcrosses of CCDKO with C57Bl/6 mice. We found that the primary pathological event in CCDKO mice develops in the inferior outer nuclear layer independently of light around postnatal day P14. RPE and vascular lesions develop secondarily with increasing penetrance with age and are clinically similar to retinal telangiectasia not to choroidal neovascularisation. Furthermore, we provide evidence that a third autosomal recessive gene causes the degeneration in CCDKO mice and in all affected re-derived lines and subsequently demonstrated co-segregation of the naturally occurring RD8 mutation in the Crb1 gene. By comparing CCDKO mice with re-derived CCl2(-/-)/Crb1(Rd8/RD8), Cx3cr1(-/-)/Crb1(Rd8/RD8) and CCl2(-/-)/Cx3cr1(-/-)/Crb1(Rd8/RD8) mice, we observed a differential modulation of the retinal phenotype by genetic background and both chemokine signalling pathways. These findings indicate that CCDKO mice are not a model of AMD, but a model for an inherited retinal degeneration that is differentially modulated by Ccl2-Ccr2 and Cx3cl1-Cx3cr1 chemokine signalling.
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Defining the role of Ccl2-Ccr2 and Cx3cl1-Cx3cr1 signalling for retinal pathology is of particular interest because of its potential role in age-related macular degeneration (AMD). Ccl2, Ccr2, and Cx3cr1 signalling defects impair macrophage trafficking, but have, in several conflicting studies, been reported to show different degrees of age-related retinal degeneration. Ccl2/Cx3cr1 double knockout (CCDKO) mice show an early onset retinal degeneration and have been suggested as a model for AMD. In order to understand phenotypic discrepancies in different chemokine knockout lines and to study how defects in Ccl2 and/or Cx3cr1 signalling contribute to the described early onset retinal degeneration, we defined primary and secondary pathological events in CCDKO mice. To control for genetic background variability, we compared the original phenotype with that of single Ccl2, Cx3cr1 and Ccl2/Cx3cr1 double knockout mice obtained from backcrosses of CCDKO with C57Bl/6 mice. We found that the primary pathological event in CCDKO mice develops in the inferior outer nuclear layer independently of light around postnatal day P14. RPE and vascular lesions develop secondarily with increasing penetrance with age and are clinically similar to retinal telangiectasia not to choroidal neovascularisation. Furthermore, we provide evidence that a third autosomal recessive gene causes the degeneration in CCDKO mice and in all affected re-derived lines and subsequently demonstrated co-segregation of the naturally occurring RD8 mutation in the Crb1 gene. By comparing CCDKO mice with re-derived CCl2(-/-)/Crb1(Rd8/RD8), Cx3cr1(-/-)/Crb1(Rd8/RD8) and CCl2(-/-)/Cx3cr1(-/-)/Crb1(Rd8/RD8) mice, we observed a differential modulation of the retinal phenotype by genetic background and both chemokine signalling pathways. These findings indicate that CCDKO mice are not a model of AMD, but a model for an inherited retinal degeneration that is differentially modulated by Ccl2-Ccr2 and Cx3cl1-Cx3cr1 chemokine signalling.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0035551</identifier><identifier>PMID: 22545116</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Age ; Age related diseases ; Aging ; Animals ; Apoptosis ; Archives &amp; records ; Atherosclerosis ; Autosomal recessive inheritance ; Biology ; Biomedical research ; CCR2 protein ; Chemokine CCL2 - genetics ; Chemokine CCL2 - immunology ; Chemokines ; CRB1 gene ; CX3C Chemokine Receptor 1 ; CX3CR1 protein ; Cytokines ; Defects ; Dendritic cells ; Diabetes ; Diabetic retinopathy ; Female ; Genetics ; Genotype ; House mouse ; Lesions ; Light ; Macrophages ; Macular degeneration ; Male ; Medicine ; Mice ; Mice, Inbred C57BL ; Mice, Knockout ; Microglia ; Modulation ; Monocyte chemoattractant protein 1 ; Mutation ; Neovascularization ; Nerve Tissue Proteins - genetics ; Nervous system ; Neurotoxicity ; Ophthalmology ; Photoreceptors ; Physiological aspects ; Protein expression ; Proteins ; Receptors, Chemokine - genetics ; Receptors, Chemokine - immunology ; Retina ; Retina - immunology ; Retina - metabolism ; Retina - pathology ; Retinal degeneration ; Retinal Degeneration - genetics ; Retinal Degeneration - immunology ; Retinal Degeneration - pathology ; Science ; Signal transduction ; Signaling</subject><ispartof>PloS one, 2012-04, Vol.7 (4), p.e35551</ispartof><rights>COPYRIGHT 2012 Public Library of Science</rights><rights>2012 Luhmann et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License: https://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 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Defining the role of Ccl2-Ccr2 and Cx3cl1-Cx3cr1 signalling for retinal pathology is of particular interest because of its potential role in age-related macular degeneration (AMD). Ccl2, Ccr2, and Cx3cr1 signalling defects impair macrophage trafficking, but have, in several conflicting studies, been reported to show different degrees of age-related retinal degeneration. Ccl2/Cx3cr1 double knockout (CCDKO) mice show an early onset retinal degeneration and have been suggested as a model for AMD. In order to understand phenotypic discrepancies in different chemokine knockout lines and to study how defects in Ccl2 and/or Cx3cr1 signalling contribute to the described early onset retinal degeneration, we defined primary and secondary pathological events in CCDKO mice. To control for genetic background variability, we compared the original phenotype with that of single Ccl2, Cx3cr1 and Ccl2/Cx3cr1 double knockout mice obtained from backcrosses of CCDKO with C57Bl/6 mice. 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genetics</topic><topic>Receptors, Chemokine - immunology</topic><topic>Retina</topic><topic>Retina - immunology</topic><topic>Retina - metabolism</topic><topic>Retina - pathology</topic><topic>Retinal degeneration</topic><topic>Retinal Degeneration - genetics</topic><topic>Retinal Degeneration - immunology</topic><topic>Retinal Degeneration - pathology</topic><topic>Science</topic><topic>Signal transduction</topic><topic>Signaling</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Luhmann, Ulrich F O</creatorcontrib><creatorcontrib>Lange, Clemens A</creatorcontrib><creatorcontrib>Robbie, Scott</creatorcontrib><creatorcontrib>Munro, Peter M G</creatorcontrib><creatorcontrib>Cowing, Jill A</creatorcontrib><creatorcontrib>Armer, Hannah E J</creatorcontrib><creatorcontrib>Luong, Vy</creatorcontrib><creatorcontrib>Carvalho, Livia S</creatorcontrib><creatorcontrib>MacLaren, Robert E</creatorcontrib><creatorcontrib>Fitzke, Frederick W</creatorcontrib><creatorcontrib>Bainbridge, James W B</creatorcontrib><creatorcontrib>Ali, Robin R</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Gale In Context: Opposing Viewpoints</collection><collection>Gale In Context: Science</collection><collection>ProQuest Central (Corporate)</collection><collection>Animal Behavior Abstracts</collection><collection>Bacteriology Abstracts (Microbiology B)</collection><collection>Biotechnology Research Abstracts</collection><collection>Nursing &amp; Allied Health Database</collection><collection>Ecology Abstracts</collection><collection>Entomology Abstracts (Full archive)</collection><collection>Immunology Abstracts</collection><collection>Meteorological &amp; Geoastrophysical Abstracts</collection><collection>Nucleic Acids Abstracts</collection><collection>Virology and AIDS Abstracts</collection><collection>Agricultural Science Collection</collection><collection>Health &amp; Medical Collection</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Medical Database (Alumni Edition)</collection><collection>ProQuest Pharma Collection</collection><collection>Public Health Database</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>ProQuest Natural Science Collection</collection><collection>Hospital Premium Collection</collection><collection>Hospital Premium Collection (Alumni Edition)</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>Materials Science &amp; Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest One Sustainability</collection><collection>ProQuest Central UK/Ireland</collection><collection>Advanced Technologies &amp; Aerospace Collection</collection><collection>Agricultural &amp; Environmental Science Collection</collection><collection>ProQuest Central Essentials</collection><collection>Biological Science Collection</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>Natural Science Collection</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ProQuest One Community College</collection><collection>ProQuest Materials Science Collection</collection><collection>ProQuest Central Korea</collection><collection>Engineering Research Database</collection><collection>Health Research Premium Collection</collection><collection>Health Research Premium Collection (Alumni)</collection><collection>ProQuest Central Student</collection><collection>AIDS and Cancer Research Abstracts</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Health &amp; Medical Complete (Alumni)</collection><collection>Materials Science Database</collection><collection>Nursing &amp; Allied Health Database (Alumni Edition)</collection><collection>Meteorological &amp; Geoastrophysical Abstracts - 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Defining the role of Ccl2-Ccr2 and Cx3cl1-Cx3cr1 signalling for retinal pathology is of particular interest because of its potential role in age-related macular degeneration (AMD). Ccl2, Ccr2, and Cx3cr1 signalling defects impair macrophage trafficking, but have, in several conflicting studies, been reported to show different degrees of age-related retinal degeneration. Ccl2/Cx3cr1 double knockout (CCDKO) mice show an early onset retinal degeneration and have been suggested as a model for AMD. In order to understand phenotypic discrepancies in different chemokine knockout lines and to study how defects in Ccl2 and/or Cx3cr1 signalling contribute to the described early onset retinal degeneration, we defined primary and secondary pathological events in CCDKO mice. To control for genetic background variability, we compared the original phenotype with that of single Ccl2, Cx3cr1 and Ccl2/Cx3cr1 double knockout mice obtained from backcrosses of CCDKO with C57Bl/6 mice. We found that the primary pathological event in CCDKO mice develops in the inferior outer nuclear layer independently of light around postnatal day P14. RPE and vascular lesions develop secondarily with increasing penetrance with age and are clinically similar to retinal telangiectasia not to choroidal neovascularisation. Furthermore, we provide evidence that a third autosomal recessive gene causes the degeneration in CCDKO mice and in all affected re-derived lines and subsequently demonstrated co-segregation of the naturally occurring RD8 mutation in the Crb1 gene. By comparing CCDKO mice with re-derived CCl2(-/-)/Crb1(Rd8/RD8), Cx3cr1(-/-)/Crb1(Rd8/RD8) and CCl2(-/-)/Cx3cr1(-/-)/Crb1(Rd8/RD8) mice, we observed a differential modulation of the retinal phenotype by genetic background and both chemokine signalling pathways. These findings indicate that CCDKO mice are not a model of AMD, but a model for an inherited retinal degeneration that is differentially modulated by Ccl2-Ccr2 and Cx3cl1-Cx3cr1 chemokine signalling.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>22545116</pmid><doi>10.1371/journal.pone.0035551</doi><tpages>e35551</tpages><oa>free_for_read</oa></addata></record>
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subjects Age
Age related diseases
Aging
Animals
Apoptosis
Archives & records
Atherosclerosis
Autosomal recessive inheritance
Biology
Biomedical research
CCR2 protein
Chemokine CCL2 - genetics
Chemokine CCL2 - immunology
Chemokines
CRB1 gene
CX3C Chemokine Receptor 1
CX3CR1 protein
Cytokines
Defects
Dendritic cells
Diabetes
Diabetic retinopathy
Female
Genetics
Genotype
House mouse
Lesions
Light
Macrophages
Macular degeneration
Male
Medicine
Mice
Mice, Inbred C57BL
Mice, Knockout
Microglia
Modulation
Monocyte chemoattractant protein 1
Mutation
Neovascularization
Nerve Tissue Proteins - genetics
Nervous system
Neurotoxicity
Ophthalmology
Photoreceptors
Physiological aspects
Protein expression
Proteins
Receptors, Chemokine - genetics
Receptors, Chemokine - immunology
Retina
Retina - immunology
Retina - metabolism
Retina - pathology
Retinal degeneration
Retinal Degeneration - genetics
Retinal Degeneration - immunology
Retinal Degeneration - pathology
Science
Signal transduction
Signaling
title Differential modulation of retinal degeneration by Ccl2 and Cx3cr1 chemokine signalling
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