Dysregulation in retinal para-inflammation and age-related retinal degeneration in CCL2 or CCR2 deficient mice

We have shown previously that a para-inflammatory response exists at the retinal/choroidal interface in the aging eye; and this response plays an important role in maintaining retinal homeostasis under chronic stress conditions. We hypothesized that dysregulation of the para-inflammatory response ma...

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Veröffentlicht in:PloS one 2011-08, Vol.6 (8), p.e22818-e22818
Hauptverfasser: Chen, Mei, Forrester, John V, Xu, Heping
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description We have shown previously that a para-inflammatory response exists at the retinal/choroidal interface in the aging eye; and this response plays an important role in maintaining retinal homeostasis under chronic stress conditions. We hypothesized that dysregulation of the para-inflammatory response may result in an overt pro-inflammatory response inducing retinal degeneration. In this study, we examined this hypothesis in mice deficient in chemokine CCL2 or its cognate receptor CCR2. CCL2- or CCR2-deficient mice developed retinal degenerative changes with age, characterized as retinal pigment epithelial (RPE) cell and photoreceptor cell death. Retinal cell death was associated with significantly more subretinal microglial accumulation and increased complement activation. In addition, monocytes from CCL2- or CCR2-deficient mice had reduced capacity for phagocytosis and chemotaxis, expressed less IL-10 but more iNOS, IL-12 and TNF-α when compared to monocytes from WT mice. Complement activation at the site of RPE cell death resulted in C3b/C3d but not C5b-9 deposition, indicating only partial activation of the complement pathway. Our results suggest that altered monocyte functions may convert the protective para-inflammatory response into an overtly harmful inflammation at the retina/choroidal interface in CCL2- or CCR2-deficient mice, leading to RPE and photoreceptor degeneration. These data support a concept whereby a protective para-inflammatory response relies upon a normally functioning innate immune system. If the innate immune system is deficient chronic stress may tip the balance towards an overt inflammatory response causing cell/tissue damage.
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We hypothesized that dysregulation of the para-inflammatory response may result in an overt pro-inflammatory response inducing retinal degeneration. In this study, we examined this hypothesis in mice deficient in chemokine CCL2 or its cognate receptor CCR2. CCL2- or CCR2-deficient mice developed retinal degenerative changes with age, characterized as retinal pigment epithelial (RPE) cell and photoreceptor cell death. Retinal cell death was associated with significantly more subretinal microglial accumulation and increased complement activation. In addition, monocytes from CCL2- or CCR2-deficient mice had reduced capacity for phagocytosis and chemotaxis, expressed less IL-10 but more iNOS, IL-12 and TNF-α when compared to monocytes from WT mice. Complement activation at the site of RPE cell death resulted in C3b/C3d but not C5b-9 deposition, indicating only partial activation of the complement pathway. Our results suggest that altered monocyte functions may convert the protective para-inflammatory response into an overtly harmful inflammation at the retina/choroidal interface in CCL2- or CCR2-deficient mice, leading to RPE and photoreceptor degeneration. These data support a concept whereby a protective para-inflammatory response relies upon a normally functioning innate immune system. 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We hypothesized that dysregulation of the para-inflammatory response may result in an overt pro-inflammatory response inducing retinal degeneration. In this study, we examined this hypothesis in mice deficient in chemokine CCL2 or its cognate receptor CCR2. CCL2- or CCR2-deficient mice developed retinal degenerative changes with age, characterized as retinal pigment epithelial (RPE) cell and photoreceptor cell death. Retinal cell death was associated with significantly more subretinal microglial accumulation and increased complement activation. In addition, monocytes from CCL2- or CCR2-deficient mice had reduced capacity for phagocytosis and chemotaxis, expressed less IL-10 but more iNOS, IL-12 and TNF-α when compared to monocytes from WT mice. Complement activation at the site of RPE cell death resulted in C3b/C3d but not C5b-9 deposition, indicating only partial activation of the complement pathway. 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We hypothesized that dysregulation of the para-inflammatory response may result in an overt pro-inflammatory response inducing retinal degeneration. In this study, we examined this hypothesis in mice deficient in chemokine CCL2 or its cognate receptor CCR2. CCL2- or CCR2-deficient mice developed retinal degenerative changes with age, characterized as retinal pigment epithelial (RPE) cell and photoreceptor cell death. Retinal cell death was associated with significantly more subretinal microglial accumulation and increased complement activation. In addition, monocytes from CCL2- or CCR2-deficient mice had reduced capacity for phagocytosis and chemotaxis, expressed less IL-10 but more iNOS, IL-12 and TNF-α when compared to monocytes from WT mice. Complement activation at the site of RPE cell death resulted in C3b/C3d but not C5b-9 deposition, indicating only partial activation of the complement pathway. Our results suggest that altered monocyte functions may convert the protective para-inflammatory response into an overtly harmful inflammation at the retina/choroidal interface in CCL2- or CCR2-deficient mice, leading to RPE and photoreceptor degeneration. These data support a concept whereby a protective para-inflammatory response relies upon a normally functioning innate immune system. If the innate immune system is deficient chronic stress may tip the balance towards an overt inflammatory response causing cell/tissue damage.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>21850237</pmid><doi>10.1371/journal.pone.0022818</doi><tpages>e22818</tpages><oa>free_for_read</oa></addata></record>
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subjects Age
Aging
Animals
Autoimmune Diseases - genetics
Autoimmune Diseases - metabolism
Breakdowns
CC chemokine receptors
CCR2 protein
Cell activation
Cell death
Chemokine CCL2 - deficiency
Chemokine CCL2 - genetics
Chemokines
Chemotaxis
Complement
Complement activation
Complement component C3b
Cytokines
Dendritic Cells - metabolism
Female
Free radicals
Genes
Homeostasis
Hypotheses
Immune system
Inflammation
Inflammatory response
Innate immunity
Interleukin 10
Interleukin 12
Interleukin-10 - metabolism
Lasers
Leukocytes, Mononuclear - metabolism
Light
Lymphatic system
Macular degeneration
Medicine
Mice
Mice, Knockout
Microscopy, Electron, Transmission
Monocyte chemoattractant protein 1
Monocytes
Mortality
Nitric Oxide Synthase Type II - metabolism
Nitric-oxide synthase
Phagocytosis
Photoreceptors
Physiological aspects
Physiology
Receptors, CCR2 - deficiency
Receptors, CCR2 - genetics
Retina
Retina - metabolism
Retina - pathology
Retina - ultrastructure
Retinal degeneration
Retinal Diseases - genetics
Retinal Diseases - metabolism
Retinal Diseases - pathology
Retinal Pigment Epithelium - metabolism
Retinal Pigment Epithelium - pathology
Rodents
Stress (Psychology)
Tumor Necrosis Factor-alpha - metabolism
Tumor necrosis factor-α
title Dysregulation in retinal para-inflammation and age-related retinal degeneration in CCL2 or CCR2 deficient mice
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