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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Differential capacity of therapeutic drugs to induce Rods/Rings structures in vitro and in vivo and generation of anti-Rods/Rings autoantibodies

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Author(s):
Keppeke, Gerson Dierley ; Prado, Monica Simon ; Nunes, Eunice ; Perazzio, Sandro Felix ; Rodrigues, Silvia Helena ; Gomes Ferraz, Maria Lucia ; Chan, Edward K. L. ; Coelho Andrade, Luis Eduardo
Total Authors: 8
Document type: Journal article
Source: Clinical Immunology; v. 173, p. 149-156, DEC 2016.
Web of Science Citations: 7
Abstract

Some HCV patients using ribavirin and interferon alpha (IFN-alpha) develop anti-rods and rings (RR) autoantibodies, the main target of which is inosine monophosphate dehydrogenase (IMPDH), the rate-determining enzyme in de novo GTP biosynthesis. In vitro inhibition of IMPDH by ribavirin induces RR formation. Here we investigate whether other commonly used drugs that interfere with GTP biosynthesis can induce RR structures in vitro and vivo and elicit generation of autoantibodies. HEp-2 cells treated for 24 h with ribavirin, mycophenolic acid (MPA), azathioprine, methotrexate or acyclovir were positive for RR structures. However, adefovir, entecavir, tenofovir and lamivudine did not induce RR structures in these cells. Structures induced by ribavirin in HEp-2 cells are stable after 24 h drug-washout, while structures induced by other drugs are relatively labile, disappearing within 2 h. Looking at patients treated with these drugs, HCV patients treated with ribavirin (n = 17) showed higher average percentage of RR-positive peripheral mononuclear cells than autoimmune patients treated with RR-inducing immunosuppressant drugs (n = 21). Serum from 173 autoimmune patients who had been treated with MPA, azathioprine or methotrexate was tested for presence of anti-RR autoantibodies, and only one sample was found to be positive. Conversely, of 48 anti-RR autoantibody positive samples identified at Fleury Laboratories over 30 months, 94% were from HCV patients treated with ribavirin plus IFN-alpha. These data indicate that RR structures can be induced by a variety of drugs in vitro and in vivo, but anti-RR autoantibody production is mostly restricted to HCV patients under ribavirin + IFN-alpha treatment. (C) 2016 Elsevier Inc. All rights reserved. (AU)

FAPESP's process: 11/12448-0 - Antibodies anti-"Rods & Rings", HCV and ribavirin/interferon: A human model of autoantibodies generation.
Grantee:Gerson Dierley Keppeke
Support Opportunities: Scholarships in Brazil - Doctorate