Abstract
Messenger RNA that encodes for interleukin-15 (IL15) has been reported to be constitutively expressed in skeletal muscle, although the protein product is not generally observed. Furthermore, interferon-γ (IFN-γ) has been reported to exacerbate symptoms of experimental myasthenia gravis (EAMG). Therefore, since IL-15 is an activator of IFN-γ-producing cells, the hypothesis that drove the study reported below proposes that muscle is not a passive participant in the development of disease symptoms in EAMG and, in fact, plays a very important active role by producing immunomodulating factors that can influence the eventual immunopathological impact of the immune system on muscle. Tests of this hypothesis, made using a monoclonal skeletal myocyte line from the Lewis rat, have indicated that myocytes produce IL-15 protein following exposure to interleukin-4 (IL-4), an interesting paradox in light of the usual anti-inflammatory role played by IL-4. Furthermore, the level of IL-15 also can be regulated by IFN-γ itself. Although yet to be confirmed in vivo, IFN-γ has been shown to be capable of activating cultured myocytes in a variety of ways that could influence the ongoing autoimmune response associated with EAMG. (C) Academic Press.
Original language | English (US) |
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Pages (from-to) | 133-139 |
Number of pages | 7 |
Journal | Clinical Immunology |
Volume | 94 |
Issue number | 2 |
DOIs | |
State | Published - Feb 2000 |
Keywords
- Cytokines
- EAMG
- IFN-γ
- IL-15
- IL-4
- Muscle
ASJC Scopus subject areas
- Immunology and Allergy
- Immunology