Interleukin-2 inhibition of oligodendrocyte progenitor cell proliferation depends on expression of the TAC receptor.
Interleukin-2 (IL-2) has been shown to inhibit oligodendrocyte progenitor cell proliferation. Within the immune system, IL-2 biological action is dependent strictly on the expression of the IL-2 receptor. The antibody TAC, which specifically binds the lymphocyte IL-2 receptor, has been shown to also bind oligodendrocyte progenitor cells cultured in a serumless, chemically defined medium. The expression of the TAC antigen was found necessary for IL-2 inhibition of oligodendrocyte progenitor cell proliferation. After IL-2 induced down-regulation of the TAC antigen, the progenitor cell was unresponsive to IL-2, even 72 hr after IL-2 withdrawal. During this unresponsive period, the oligodendrocyte progenitor cell was immunocytochemically negative for the TAC antigen. Thus, in contrast to IL-2 receptors on T-cells, IL-2 does not up-regulate its receptor on oligodendrocyte progenitor cells. However, upon interleukin 1 (IL-1) addition both IL-2 responsiveness and TAC immunocytochemical staining reappeared. These data suggest that IL-2 inhibition of progenitor cell proliferation depends on the expression of the TAC antigen, which can be regulated by IL-1.
D000818:Animals; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D007375:Interleukin-1 / Q000494:pharmacology; D007376:Interleukin-2 / Q000494:pharmacology*; D009457:Neuroglia / Q000166:cytology*; D009836:Oligodendroglia / Q000166:cytology* / Q000502:physiology; D051381:Rats; D011948:Receptors, Antigen, T-Cell / Q000502:physiology*; D011971:Receptors, Immunologic / Q000502:physiology*; D015375:Receptors, Interleukin-2
D007375:Interleukin-1; D007376:Interleukin-2; D011948:Receptors, Antigen, T-Cell; D011971:Receptors, Immunologic; D015375:Receptors, Interleukin-2