Interaction between oligodendroglia and immune cells: Mitogenic effect of an oligodendrocyte precursor cell line on syngeneic T lymphocytes
✍ Scribed by T. Yamamura; D. Sun; F. Aloisi; W. E. F. Klinkert; Dr. Hartmut Wekerle
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 866 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0360-4012
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✦ Synopsis
We analyzed cellular interactions between T lymphocytes and a recently established immortal glial line, L3 that retains several properties of immature oligodendrocytes (Aloisi et al., J Neurosci Res 27:1&24, 1990). L3 oligodendrocytes (L3-OL) cannot be induced to express class I1 antigens, nor do they specifically present antigen to syngeneic specific T lymphocyte. However, L3-OL strongly enhance the proliferation of freshly activated, interleukin-2(IL-2)dependent T-line lymphocytes and concanavalin A (ConA)-activated lymphoblasts, irrespective of their antigen specificity or surface phenotype (CD4+ or CDS'). Resting and some activated T cells were susceptible to the mitogenic effect of L3-OL only in the presence of exogenous IL-2, not of other cytokines. The mitogenic effect of L3-OL did not depend on cell viability. It was observed in paraformaldehyde-fixed L3-OL cells and in membrane preparations, but not in culture supernatant. Neither intact L3-OL cells nor membrane preparations had direct IL-2 activity. The conclusion that the mitogenic effect of L3-OL cells is exerted by membrane structures acting as a costimulatory factor@) of IL-2 is supported by the finding that it is largely blocked by a monoclonal anti-IL-2 receptor antibody. The effect is distinct from membrane-bound IL-1, membrane-bound tumor necrosis factor-a (TNF-a), IL-3, or IL-6 and cannot be reconstituted by these cytokines.