Abstract
Autoimmune retinopathy (AIR) was often mistaken for retinitis pigmentosa (RP), due to an overlap of clinical findings, but increasingly has been recognized as a unique entity in the last decade. AIR has distinctive features: sudden onset of photopsias and scotomata in patients with no family history of RP, followed by visual field and central vision loss. Initially, retina exams are normal with no sign of pigment deposits or retinal degeneration. A family history of autoimmune diseases (all types) occurs in 60% of patients. One hallmark of AIR has been the presence of anti-retinal autoimmune antibodies (ARAs) in patients’ sera, but patients can continue to have ARAs even when the disease has been quiescent for years. The accumulation of ARAs represents a breakdown of retinal immune tolerance with many different immunoreactive bands found at different reference weights in AIR patients. We began investigating cellular immunity using flow cytometry and found abnormal distributions (>2 StDev) of increased memory lymphocytes and NK cells and decreased regulatory B cell subsets in many AIR patients compared to normal controls. Culture of patient lymphocytes with small amounts (25 μg) of recoverin protein for 6 days led to significant elevations of interferon gamma (IFNγ) and in some cases tumor necrosis factor alpha (TNFα) production. We found the IFNγ/IL-10 ratio in response to recoverin was elevated in patients with more active disease (defined by visual field contraction between visits), but in some patients, there also appeared to be independent factors influencing severity, suggesting other autoimmune mechanisms were at play. These cellular immune parameters may provide improved markers for active AIR.
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Supported by an unrestricted grant from Research to Prevent Blindness to Department of Ophthalmology and Paul R. Lichter Chair of Ophthalmic Genetics and the Opler fund.
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Heckenlively, J.R., Lundy, S.K. (2018). Autoimmune Retinopathy: An Immunologic Cellular-Driven Disorder. In: Ash, J., Anderson, R., LaVail, M., Bowes Rickman, C., Hollyfield, J., Grimm, C. (eds) Retinal Degenerative Diseases. Advances in Experimental Medicine and Biology, vol 1074. Springer, Cham. https://doi.org/10.1007/978-3-319-75402-4_24
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DOI: https://doi.org/10.1007/978-3-319-75402-4_24
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