Blockade of the interleukin-21/interleukin-21 receptor pathway ameliorates disease in animal models of rheumatoid arthritis.
Arthritis Rheum
; 56(4): 1152-63, 2007 Apr.
Article
em En
| MEDLINE
| ID: mdl-17393408
ABSTRACT
OBJECTIVE:
Interleukin-21 (IL-21) is a T cell-derived cytokine that modulates T cell, B cell, and natural killer cell responses. In this study, the effects of blocking IL-21 were examined in 2 rodent models of rheumatoid arthritis (RA) to determine whether IL-21 contributes to their pathologic processes.METHODS:
DBA/1 mice were immunized with bovine type II collagen and then treated with murine IL-21 receptor Fc fusion protein (IL-21R.Fc), which was initiated after the onset of arthritis symptoms in 10% of the cohort. The mice were assessed 3 times per week for signs of disease, including histologic features as well as serum cytokine, Ig, and cytokine messenger RNA (mRNA) levels in the paws. In a separate experiment, Lewis rats were immunized with Freund's complete adjuvant followed by administration of IL-21R.Fc at the peak of inflammation in the joints. Rats were assessed daily for histologic features and for scoring of arthritis severity. In addition, the effects of IL-21R.Fc on the production of interferon-gamma (IFNgamma) by T cells were examined.RESULTS:
Treatment of DBA/1 mice with IL-21R.Fc reduced the clinical and histologic signs of collagen-induced arthritis. Nonspecific IgG1 levels were decreased in response to treatment. The levels of IL-6 mRNA in the paws and the serum IL-6 levels were decreased after treatment with IL-21R.Fc. IFNgamma mRNA levels were increased in the paws, and the addition of IL-21R.Fc to collagen-activated lymph node cultures enhanced the levels of IFNgamma. Collagen-specific spleen cell responses in IL-21R.Fc-treated mice were observed as reduced levels of IFNgamma and increased levels of IL-6. Treatment of Lewis rats with IL-21R.Fc after induction of adjuvant-induced arthritis resulted in reversal of disease signs and improvements in histologic parameters.CONCLUSION:
These findings demonstrate a pathogenic role for IL-21 in animal models of RA, and support consideration of IL-21 as a therapeutic target in human RA.
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Base de dados:
MEDLINE
Assunto principal:
Artrite Experimental
/
Proteínas Recombinantes de Fusão
/
Fragmentos Fc das Imunoglobulinas
/
Interleucinas
/
Receptores de Interleucina-21
/
Subunidade alfa de Receptor de Interleucina-21
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
Arthritis Rheum
Ano de publicação:
2007
Tipo de documento:
Article
País de afiliação:
Estados Unidos