Possible role of interleukin-17 in a prime/challenge model of multiple sclerosis
Abstract
No one single pathogen has been identified as the causative agent of multiple sclerosis (MS). Alternately, the likelihood of an autoimmune event may be nonspecifically enhanced by different infectious agents. In a novel animal model of MS, SJL/J mice primed through infection with a recombinant vaccinia virus (VV) encoding myelin proteolipid protein (PLP) (VVPLP) were susceptible to a central nervous system (CNS) inflammatory disease following administration of a nonspecific immunostimulant [complete Freund’s adjuvant (CFA) plus Bordetella pertussis (BP)]. Mononuclear cells isolated from the brains, but not the spleens, of VVPLP-primed CFA/BP challenged mice produced interleukin (IL)-17 and interferon-γ and transferred a CNS inflammatory disease to naïve SJL/J mice. Administration of curdlan, a T helper 17 cell inducer, unexpectedly resulted in less severe clinical and histological signs of disease, compared to CFA/BP challenged mice, despite the induction of IL-17 in the periphery. Further examination of the VVPLP-prime CFA/BP challenge model may suggest new mechanisms for how different pathogens associated with MS can protect or enhance disease.
Keywords
Autoimmunity CNS inflammatory demyelinating diseases Experimental autoimmune encephalomyelitis Multiple sclerosis Theiler’s murine encephalomyelitis virus VaccinationNotes
Acknowledgments
We thank J. Lindsay Whitton, MD, PhD, and Matthew F. Cusick, PhD, for many helpful discussions, and Nikki J. Kennett, MS, Daniel J. Doty, BS, Braden T. McElreath, Lincoln R. Neugebauer and Robert Greenhalgh, BS, for excellent technical assistance. We are grateful to Mr. Daniel J. Harper for preparation of the manuscript. This work was supported by NIH grants AI058105-05 (RSF), R21NS059724, P20-RR018724 and 8P20 GM103433-10 (IT).
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