Regulation of Interleukin-17 Production in Patients with Rheumatoid Arthritis by Phosphoinositide 3-kinase (PI3K)/Akt and Nuclear Factor KappaB (NF-κB) Dependent Signal Transduction Pathway

We showed previously that interleukin-17 (IL-17) plays a significant role in the induction of arthritis associated with Borrelia vaccination and challenge. Little information, however, is available about the chain of immunologic events that leads to the release of IL-17. The production of IL-17 has been linked to stimulation of memory cells by IL-15. Therefore, we hypothesized that IL-15 is involved in the induction of arthritis associated with Borrelia vaccination and infection of mice. Here we present evidence that treatment of Borrelia-vaccinated and -infected mice with anti-IL-15 antibody prevents swelling of the hind paws. More importantly, both anti-IL-15 antibody-and recombinant IL-15 receptor alpha-treated Borrelia-vaccinated and -infected mice were free of major histopathologic indications of arthritis, including hyperplasia, hypertrophy, and vilus formation of the synovium. Similarly, the synovial space and perisynovium were free of inflammatory cells. By contrast, the synovium of nontreated Borrelia-vaccinated and -infected mice had overt hyperplasia, hypertrophy, and vilus formation. Moreover, the synovial space and perisynovium were infiltrated with neutrophils, macrophages, and lymphocytes. Finally, we show that recombinant IL-15 stimulates the release of IL-17 from lymph node cells obtained near the arthritic site. These results suggest that IL-15 plays a major role in orchestrating IL-17 induction of arthritis associated with Borrelia-vaccinated and -infected mice.

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Anti-Interleukin-15 Prevents Arthritis inBorrelia-Vaccinated and -Infected Mice

Amlong¹,

Nardelli²,

Peterson³

et al. 2006

Clin Vaccine Immunol

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Regulation of Interleukin-17 Production in Patients with Rheumatoid Arthritis by Phosphoinositide 3-kinase (PI3K)/Akt and Nuclear Factor KappaB (NF-κB) Dependent Signal Transduction Pathway

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Anti-Interleukin-15 Prevents Arthritis inBorrelia-Vaccinated and -Infected Mice

Anti-Interleukin-15 Prevents Arthritis inBorrelia-Vaccinated and -Infected Mice

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