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Aggravated experimental autoimmune encephalomyelitis in IL-15 knockout mice

Authors
Journal
Experimental Neurology
0014-4886
Publisher
Elsevier
Publication Date
Volume
222
Issue
2
Identifiers
DOI: 10.1016/j.expneurol.2009.12.034
Keywords
  • Cd4
  • Cd8
  • Cx3Cr1
  • Multiple Sclerosis
  • Cytokines
  • Demyelination
Disciplines
  • Biology
  • Medicine

Abstract

Abstract IL-15 initially identified as a T proliferating cytokine has several structural and biological similarities with IL-2 and has been associated with a number of autoimmune diseases. Because of the scarcity of information available on the role of IL-15 in MS pathogenesis, we have investigated how the absence of IL-15 affected the development of experimental autoimmune encephalomyelitis, a mouse model of MS. Following immunization of IL-15 −/− and C57BL/6 mice with MOG 35–55, we observed a more severe neurological impairment in the IL-15 knockout mice than in the wild-type group. The enhanced disease severity in IL-15 −/− mice was associated with greater demyelination in the spinal cord, increased immune cell infiltration and inflammation. These events may be related to the higher CD4/CD8 ratio and the almost absent NK cell activity, congenital immune features of IL-15KO mice. Moreover, we found that the fractalkine receptor CX3CR1 was overexpressed in the spinal cord of IL-15 −/− mice, mainly localized on infiltrating CD8 + T cells. How these findings are contributing to the aggravated EAE development in IL-15 KO mice remain unclear and need to be further investigated.

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