title: Expression of interferon-gamma receptors on murine oligodendrocytes and its regulation by cytokines and mitogens.
abstract: Interferon-gamma (IFN-gamma) is a cytokine known to exert an important immunological role on astrocytes and oligodendrocytes. As a receptor for IFN-gamma has been demonstrated on murine astrocytes, we have searched for a specific receptor on the cell surface of pure mouse oligodendrocytes maintained in tissue culture. Using recombinant murine IFN-gamma labelled with 125I, we have established the basic physicochemical parameters of the binding. A single receptor was found with a Kd of 1 x 10(-9) M. The number of receptors per cell was 3000-4000 and its molecular weight, as determined by cross-linking experiments, is 87,000. The binding of IFN-gamma to its oligodendrocyte receptor is saturable, specific and temperature-dependent. The receptor-IFN-gamma complex is quickly endocytosed at 37 degrees (the half-time of maximal internalization is around 1 min). Some cytokines, such as interleukin-1 alpha and interleukin-6, up-regulated the expression of the oligodendrocyte receptor, but others, such as tumour necrosis factor-alpha, did not. A dramatic increase in receptor expression is induced by lipopolysaccharide but it is not detectable after treatment with concanavalin A.
mesh_terms: D000818:Animals; D015703:Antigens, CD / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D016207:Cytokines / Q000276:immunology*; D005786:Gene Expression Regulation; D007371:Interferon-gamma / Q000378:metabolism; D007700:Kinetics; D051379:Mice; D008807:Mice, Inbred BALB C; D008815:Mice, Inbred Strains; D008934:Mitogens / Q000276:immunology*; D008970:Molecular Weight; D009836:Oligodendroglia / Q000276:immunology* / Q000378:metabolism; D017471:Receptors, Interferon / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D011994:Recombinant Proteins; D000096743:Interferon gamma Receptor
chemical_list: D015703:Antigens, CD; D016207:Cytokines; D007371:Interferon-gamma; D008934:Mitogens; D017471:Receptors, Interferon; D011994:Recombinant Proteins; D000096743:Interferon gamma Receptor