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Standard CD44 (CD44s) and its alternatively spliced variants (CD44v) were found to be associated with the metastatic potential of tumor cells, and with cell migration of autoimmune inflammatory cells, including cells involved in experimental autoimmune encephalomyelitis (EAE). The aim of the present study was to evaluate whether induction of anti-CD44 immune reactivity, through cDNA vaccination could down-regulate EAE. Our vaccination technique involved the insertion of CD44s or CD44v cDNA into a silicone tube filled with 2.5 cm long segment of hydroxylated-polyvinyl acetate wound dressing sponge (forming a virtual lymph node) which was implanted under the skin of SJL/J mice immunized with myelin antigens for EAE induction. Animals vaccinated with CD44v cDNA developed significantly less severe EAE when compared with sham vaccinated animals or animals vaccinated with CD44s cDNA. The in vitro proliferation of lymphocytes was preserved regarding myelin antigens and mitogens. Histopathological examinations revealed a significant reduction of EAE lesions and enhanced apoptosis in central nervous system (CNS)-infiltrating cells of the successfully vaccinated animals. Such methods of cDNA vaccination with CD44 could be applicable in inflammatory CNS diseases, like multiple sclerosis.
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