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and Suppresses Ongoing Adjuvant Arthritis1

*
Department of Immunology and
Rappaport Family Institute for Research in the Medical Sciences and Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel
Depending on the mode of immunization, a single administration of
CFA may result in the development of a local inflammatory process or
chronic poly adjuvant-induced arthritis (AA). Administration of naked
DNA encoding TNF-
results in the generation of immunological memory
to its gene product. Upon induction of AA, this memory effectively
inhibited the development of disease. Self-specific Abs developed in
DNA-vaccinated animals were neutralizing in vitro and could adoptively
transfer the beneficial effect of the vaccine. Administration of CFA to
induce a local delayed-type hypersensitivity response rather than AA
did not lead to an elicited production of Abs to the gene product of
the above vaccine. Thus, elicitation of protective immunity is
dependent on the development of an autoimmune condition. Most
importantly, the administration of the TNF-
DNA construct after the
onset of disease led to a rapid, long-lasting remission. This suggests
a highly effective way by which a DNA vaccine encoding an autologous
proinflammatory cytokine can be used to reprogram the immune system to
generate protective immunity to its own potentially harmful
activities.
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