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dc.contributor.authorRutar, M
dc.contributor.authorNatoli, R
dc.contributor.authorAlbarracin, R
dc.contributor.authorValter, K
dc.contributor.authorProvis, J
dc.date.accessioned2021-02-12T00:18:30Z
dc.date.available2021-02-12T00:18:30Z
dc.date.issued2012-11-26
dc.identifierpii: 1742-2094-9-257
dc.identifier.citationRutar, M., Natoli, R., Albarracin, R., Valter, K. & Provis, J. (2012). 670-nm light treatment reduces complement propagation following retinal degeneration. JOURNAL OF NEUROINFLAMMATION, 9 (1), https://doi.org/10.1186/1742-2094-9-257.
dc.identifier.issn1742-2094
dc.identifier.urihttp://hdl.handle.net/11343/260534
dc.description.abstractAIM: Complement activation is associated with the pathogenesis of age-related macular degeneration (AMD). We aimed to investigate whether 670-nm light treatment reduces the propagation of complement in a light-induced model of atrophic AMD. METHODS: Sprague-Dawley (SD) rats were pretreated with 9 J/cm(2) 670-nm light for 3 minutes daily over 5 days; other animals were sham treated. Animals were exposed to white light (1,000 lux) for 24 h, after which animals were kept in dim light (5 lux) for 7 days. Expression of complement genes was assessed by quantitative polymerase chain reaction (qPCR), and immunohistochemistry. Counts were made of C3-expressing monocytes/microglia using in situ hybridization. Photoreceptor death was also assessed using outer nuclear layer (ONL) thickness measurements, and oxidative stress using immunohistochemistry for 4-hydroxynonenal (4-HNE). RESULTS: Following light damage, retinas pretreated with 670-nm light had reduced immunoreactivity for the oxidative damage maker 4-HNE in the ONL and outer segments, compared to controls. In conjunction, there was significant reduction in retinal expression of complement genes C1s, C2, C3, C4b, C3aR1, and C5r1 following 670 nm treatment. In situ hybridization, coupled with immunoreactivity for the marker ionized calcium binding adaptor molecule 1 (IBA1), revealed that C3 is expressed by infiltrating microglia/monocytes in subretinal space following light damage, which were significantly reduced in number after 670 nm treatment. Additionally, immunohistochemistry for C3 revealed a decrease in C3 deposition in the ONL following 670 nm treatment. CONCLUSIONS: Our data indicate that 670-nm light pretreatment reduces lipid peroxidation and complement propagation in the degenerating retina. These findings have relevance to the cellular events of complement activation underling the pathogenesis of AMD, and highlight the potential of 670-nm light as a non-invasive anti-inflammatory therapy.
dc.languageEnglish
dc.publisherBMC
dc.rights.urihttps://creativecommons.org/licenses/by/4.0
dc.title670-nm light treatment reduces complement propagation following retinal degeneration
dc.typeJournal Article
dc.identifier.doi10.1186/1742-2094-9-257
melbourne.affiliation.departmentAnatomy and Neuroscience
melbourne.affiliation.facultyMedicine, Dentistry & Health Sciences
melbourne.source.titleJournal of Neuroinflammation
melbourne.source.volume9
melbourne.source.issue1
dc.rights.licenseCC BY
melbourne.elementsid1110035
melbourne.contributor.authorRutar, Matthew
dc.identifier.eissn1742-2094
melbourne.accessrightsOpen Access


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