Laboratory Evidence of Sustained Chronic Inflammatory Reaction in Retinitis Pigmentosa

PurposeTo study the nature of retinal inflammatory response in rd10 mice, an animal model of retinitis pigmentosa (RP), and to investigate the effect of an antioxidant on retinal inflammation and photoreceptor apoptosis.DesignExperimental study.Participants and ControlsThis study included 42 untreated rd10 mice, 30 N-acetylcysteine (NAC)–treated rd10 mice, and 20 C57BL/6 mice as controls.MethodsReal-time polymerase chain reaction (PCR) was performed to evaluate the expression levels of inflammatory factors (proinflammatory cytokines and chemokines) in rd10 mouse retinas. Rd10 mice were treated with an antioxidant NAC, and its effect on retinal inflammation and photoreceptor apoptosis were examined by immunohistochemistry.Main Outcome MeasuresReal-time PCR and immunohistochemistry.ResultsWe demonstrated sequential events involving increased expression of proinflammatory cytokines and chemokines, activation of microglia, and photoreceptor apoptosis during retinal degeneration of rd10 mice. Furthermore, antioxidant treatment with NAC prevented the photoreceptor cell death along with suppression of inflammatory factors and microglial activation.ConclusionsSustained chronic inflammatory reaction may contribute to the pathogenesis of retinal degeneration in rd10 mice, suggesting interventions for ocular inflammatory reaction using antioxidants as a potential treatment for patients with RP.Financial Disclosure(s)The authors have no proprietary or commercial interest in any of the materials discussed in this article.