Autoimmunity against carbonic anhydrase II affects retinal cell functions in autoimmune retinopathy

Abstract Autoantibodies against various retinal proteins, including anti-carbonic anhydrase II (CAII) autoantibodies, have been found in patients with cancer-associated retinopathy and autoimmune retinopathy without diagnosed cancer. We studied sera from retinopathy patients that showed reactivity w...

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Bibliographic Details
Published in:Journal of autoimmunity 2009-03, Vol.32 (2), p.133-139
Main Authors: Adamus, Grazyna, Karren, Landon
Format: Article
Language:English
Subjects:
Allergy and Immunology
Autoantibody
Autoimmune Diseases - enzymology
Autoimmune Diseases - immunology
Autoimmune Diseases - pathology
Autoimmune retinopathy
Autoimmunity - immunology
Biocatalysis
Biological and medical sciences
Calcium
Carbonic anhydrase II
Carbonic Anhydrase II - immunology
Carbonic Anhydrase II - metabolism
Cell Line
Eye Diseases - enzymology
Eye Diseases - immunology
Eye Diseases - pathology
Fundamental and applied biological sciences. Psychology
Fundamental immunology
Humans
Medical sciences
Ophthalmology
Retina
Retinopathies
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Summary:Abstract Autoantibodies against various retinal proteins, including anti-carbonic anhydrase II (CAII) autoantibodies, have been found in patients with cancer-associated retinopathy and autoimmune retinopathy without diagnosed cancer. We studied sera from retinopathy patients that showed reactivity with a 30-kDa retinal protein, which was identified as carbonic anhydrase II (CAII), and immunolabeled cells in human retina. The goal of the study was to examine whether patients' autoantibodies induce pathogenic effects on the catalytic function of CAII, which may have metabolic consequences on cell survival. Our findings revealed that anti-CAII autoantibodies have the capacity to induce cellular damage by impairing CAII cellular function through inhibiting the catalytic activity of CAII in a dose dependent manner, decreasing intracellular pH, increasing intracellular calcium, which in effect decreases retinal cell viability. The destabilized catalytic function of CAII and alterations in cytosolic pH were found very early, suggesting that autoantibodies are the inducers of apoptosis. In summary, our study showed that anti-CAII autoantibodies provoke pathogenic effects on retinal cells by decreasing cell survival by blocking the CAII cellular functions. The current experiments may facilitate better understanding the role of the immune system in retinal degeneration and help to develop better strategies for therapy of autoimmune retinopathy.
ISSN:0896-8411
1095-9157
DOI:10.1016/j.jaut.2009.02.001