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Prevention and Induction of Autoimmune Exocrinopathy Is Dependent on Pathogenic Autoantigen Cleavage in Murine Sjögren’s Syndrome¹

Kaoru Saegusa^*, Naozumi Ishimaru^*, Kumiko Yanagi^*, Kenji Mishima^*, Rieko Arakaki^*, Takashi Suda, Ichiro Saito^* and Yoshio Hayashi^2,*

^* Department of Pathology, Tokushima University School of Dentistry, Tokushima, Japan; and Center for the Development of Molecular Target Drugs, Cancer Research Institute, Kanazawa University, Ishikawa, Japan

The in vivo role of autoantigen cleavage during apoptosis in autoimmune diseases remains unclear. Previously, we found a cleavage product of 120-kDa -fodrin as an important autoantigen in the pathogenesis of primary Sjögren’s syndrome (SS). In the murine primary SS model, tissue-infiltrating CD4⁺ T cells purified from the salivary glands bear a large proportion of Fas ligand, and the salivary gland duct cells constitutively possess Fas. Infiltrating CD4⁺ T cells, but not CD8⁺ T cells, identified significant ⁵¹Cr release against mouse salivary gland cells. In vitro studies demonstrated that apoptotic mouse salivary gland cells result in a specific -fodrin cleavage into 120 kDa and that preincubation with caspase inhibitor peptides blocked -fodrin cleavage. In vivo treatment with caspase inhibitors N-benzyloxycarbonyl-Val-Ala-Asp fluoromethyl ketone and N-acetyl-Asp-Glu-Val-Asp-al-CHO into the murine model results in dramatic inhibitory effects on the development of autoimmune lesions and in restoration of sicca syndrome. Furthermore, we found that immunization with recombinant -fodrin protein identical with an autoantigen into normal recipients induced autoimmune lesions similar to SS. These data indicate that prevention and induction of autoimmune exocrinopathy is dependent on autoantigen cleavage via caspase cascade and that caspase inhibitors might provide a new therapeutic option directed at reducing tissue damage in the murine model for SS.

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