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Short- and long-term effects of T-cell modulating agents in experimental autoimmunity
- Mellergård, Johan (author)
-
- Havarinasab, Said, 1964- (author)
- Linköpings universitet,Hälsouniversitetet,Molekylär och immunologisk patologi
-
- Hultman, Per, 1957- (author)
- Östergötlands Läns Landsting,Linköpings universitet,Hälsouniversitetet,Molekylär och immunologisk patologi,Klinisk patologi och klinisk genetik
- (creator_code:org_t)
- Elsevier BV, 2004
- 2004
- English.
- In: Toxicology. - : Elsevier BV. - 0300-483X .- 1879-3185. ; 196:3, s. 197-209
- Journal article (peer-reviewed)
Abstract
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- Due to the easy and reliable induction of a disease condition with many of the features present in human autoimmunity, mercury-induced autoimmunity (mHgAI) in rodents is a favourable autoimmune model. Genetically susceptible (H-2 s) mice develop in response to mercury (Hg) a systemic autoimmune condition with antinucleolar antibodies (ANoA) targeting the protein fibrillarin, transient polyclonal B-cell activation, hyperimmunoglobulinemia, and systemic immune-complex (IC) deposits. In order to study the short- and long-term effects of treatment with immunomodulating agents on the disease parameters in HgAI, groups of B10.S (H-2s) mice were given 6mg HgCl2/l drinking water for 22 weeks. Three weeks initial treatment with cyclosporin A (CyA), a high dose of tacrolimus (HD tacrolimus), or anti-CD4 monoclonal antibody (a-CD4) inhibited induction of ANoA and IC deposit by Hg. This effect persisted for the subsequent 19 weeks when the mice were only treated with Hg. Initial treatment with anti-IL-4 monoclonal antibody (a-IL-4) for 3 weeks inhibited induction of IgE and IC deposits by Hg, but not ANoA. However, subsequent treatment with Hg without a-IL-4 for 19 weeks induced IC deposits. The T-cell modulating agents aggravated some of the HgAI disease parameters: a-CD4 stimulated the polyclonal B-cell activation, a-IL-4 increased the IgG antichromatin antibody response, and a low dose of tacrolimus (LD tacrolimus) enhanced the ANoA, the polyclonal B-cell activation, and the IC deposits. We conclude that a short initial treatment with a-CD4 or CyA efficiently protects against induction of systemic autoimmunity for an extended period of time. However, some of the T-cell modulating agents, especially a low dose of tacrolimus, aggravate autoimmune manifestations not only during ongoing treatment, but also after treatment with these agents has ceased.
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