TY - JOUR
T1 - Chemokine-mediated inflammation in the degenerating retina is coordinated by Müller cells, activated microglia, and retinal pigment epithelium
AU - Rutar, Matt
AU - Natoli, Riccardo
AU - Chia, R. X.
AU - Valter, Krisztina
AU - Provis, Jan M.
N1 - Publisher Copyright:
© Rutar et al.; licensee BioMed Central.
PY - 2015/1/17
Y1 - 2015/1/17
N2 - Monocyte infiltration is involved in the pathogenesis of many retinal degenerative conditions. This process traditionally depends on local expression of chemokines, though the roles of many of these in the degenerating retina are unclear. Here, we investigate expression and in situ localization of the broad chemokine response in a light-induced model of retinal degeneration. Methods: Sprague-Dawley (SD) rats were exposed to 1,000 lux light damage (LD) for up to 24 hrs. At time points during (1 to 24 hrs) and following (3 and 7 days) exposure, animals were euthanized and retinas processed. Microarray analysis assessed differential expression of chemokines. Some genes were further investigated using polymerase chain reaction (PCR) and in situ hybridization and contrasted with photoreceptor apoptosis using terminal deoxynucleotidyl transferase dUTP nick-end labeling (TUNEL). Recruitment of retinal CD45+ leukocytes was determined via fluorescence activated cell sorting (FACS), and expression of chemokine receptors determined using PCR. Results: Exposure to 24 hrs of LD resulted in differential expression of chemokines including Ccl3, Ccl4, Ccl7, Cxcl1, and Cxcl10. Their upregulation correlated strongly with peak photoreceptor death, at 24 hrs exposure. In situ hybridization revealed that the modulated chemokines were expressed by a combination of Müller cells, activated microglia, and retinal pigment epithelium (RPE). This preceded large increases in the number of CD45+ cells at 3- and 7-days post exposure, which expressed a corresponding repertoire of chemokine receptors. Conclusions: Our data indicate that retinal degeneration induces upregulation of a broad chemokine response whose expression is coordinated by Müller cells, microglia, and RPE. The findings inform our understanding of the processes govern the trafficking of leukocytes, which are contributors in the pathology of retinal degenerations.
AB - Monocyte infiltration is involved in the pathogenesis of many retinal degenerative conditions. This process traditionally depends on local expression of chemokines, though the roles of many of these in the degenerating retina are unclear. Here, we investigate expression and in situ localization of the broad chemokine response in a light-induced model of retinal degeneration. Methods: Sprague-Dawley (SD) rats were exposed to 1,000 lux light damage (LD) for up to 24 hrs. At time points during (1 to 24 hrs) and following (3 and 7 days) exposure, animals were euthanized and retinas processed. Microarray analysis assessed differential expression of chemokines. Some genes were further investigated using polymerase chain reaction (PCR) and in situ hybridization and contrasted with photoreceptor apoptosis using terminal deoxynucleotidyl transferase dUTP nick-end labeling (TUNEL). Recruitment of retinal CD45+ leukocytes was determined via fluorescence activated cell sorting (FACS), and expression of chemokine receptors determined using PCR. Results: Exposure to 24 hrs of LD resulted in differential expression of chemokines including Ccl3, Ccl4, Ccl7, Cxcl1, and Cxcl10. Their upregulation correlated strongly with peak photoreceptor death, at 24 hrs exposure. In situ hybridization revealed that the modulated chemokines were expressed by a combination of Müller cells, activated microglia, and retinal pigment epithelium (RPE). This preceded large increases in the number of CD45+ cells at 3- and 7-days post exposure, which expressed a corresponding repertoire of chemokine receptors. Conclusions: Our data indicate that retinal degeneration induces upregulation of a broad chemokine response whose expression is coordinated by Müller cells, microglia, and RPE. The findings inform our understanding of the processes govern the trafficking of leukocytes, which are contributors in the pathology of retinal degenerations.
UR - http://www.scopus.com/inward/record.url?scp=84924915117&partnerID=8YFLogxK
U2 - 10.1186/s12974-014-0224-1
DO - 10.1186/s12974-014-0224-1
M3 - Article
SN - 1742-2094
VL - 12
JO - Journal of Neuroinflammation
JF - Journal of Neuroinflammation
IS - 1
M1 - 8
ER -