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ZAP-70 Regulates Autoimmune Arthritis via Alterations in T Cell Activation and Apoptosis.


ABSTRACT: T cells play an essential role in the pathogenesis of both human rheumatoid arthritis (RA) and its murine models. A key molecule in T cell activation is ZAP-70, therefore we aimed to investigate the effects of partial ZAP-70 deficiency on the pathogenesis of recombinant human G1(rhG1)-induced arthritis (GIA), a well-established mouse model of RA. Arthritis was induced in BALB/c and ZAP-70+/- heterozygous mice. Disease progression was monitored using a scoring system and in vivo imaging, antigen-specific proliferation, cytokine and autoantibody production was measured and T cell apoptotic pathways were analyzed. ZAP-70+/- mice developed a less severe arthritis, as shown by both clinical picture and in vitro parameters (decreased T cell proliferation, cytokine and autoantibody production). The amount of cleaved Caspase-3 increased in arthritic ZAP-70+/- T cells, with no significant changes in cleaved Caspase-8 and -9 levels; although expression of Bim, Bcl-2 and Cytochrome C showed alterations. Tyrosine phosphorylation was less pronounced in arthritic ZAP-70+/- T cells and the amount of Cbl-b-a negative regulator of T cell activation-decreased as well. We hypothesize that the less severe disease seen in the partial absence of ZAP-70 might be caused by the decreased T cell activation accompanied by increased apoptosis.

SUBMITTER: Kugyelka R 

PROVIDER: S-EPMC6562615 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature

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ZAP-70 Regulates Autoimmune Arthritis via Alterations in T Cell Activation and Apoptosis.

Kugyelka Réka R   Prenek Lilla L   Olasz Katalin K   Kohl Zoltán Z   Botz Bálint B   Glant Tibor T TT   Berki Timea T   Boldizsár Ferenc F  

Cells 20190524 5


T cells play an essential role in the pathogenesis of both human rheumatoid arthritis (RA) and its murine models. A key molecule in T cell activation is ZAP-70, therefore we aimed to investigate the effects of partial ZAP-70 deficiency on the pathogenesis of recombinant human G1(rhG1)-induced arthritis (GIA), a well-established mouse model of RA. Arthritis was induced in BALB/c and ZAP-70<sup>+/-</sup> heterozygous mice. Disease progression was monitored using a scoring system and in vivo imagin  ...[more]

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