Portal de Periódicos da CAPES

Mouse soluble IFN gamma receptor as IFN gamma inhibitor. Distribution, antigenicity, and activity after injection in mice.

1993; American Association of Immunologists; Volume: 150; Issue: 7 Linguagem: Inglês

10.4049/jimmunol.150.7.2698

1550-6606

Laurence Ozmen, Giorgio Gribaudo, M. Fountoulakis, Reiner Gentz, S Landolfo, Gianni Garotta,

interferon and immune responses

Abstract With the purpose to use a soluble receptor as an IFN gamma antagonist in vivo, we assessed the immunogenicity, the half-life, the bioavailability, and the activity of the soluble receptor after injection into mice. No significant immunogenicity was detected after multiple chronic injections of mouse (Mo)IFN gamma-R or injections of MoIFN gamma-R in emulsion with CFA. Pharmacokinetic experiments using radiolabeled MoIFN gamma-R revealed that the half-life of the soluble MoIFN gamma-R is 3 h in the blood and 6 h in the lymphoid organs. When the MoIFN gamma-R protein was traced by the capacity of the animal sera to displace the binding of radiolabeled MoIFN gamma-R from affinity purified rabbit anti-MoIFN gamma-R antibodies, a blood half-life of 1 h was determined. Finally, the capacity of the injected receptor to bind and neutralize the IFN gamma-mediated antiviral activity was assessed in vivo. Treatment with IFN-gamma or IFN-alpha A/D protected the mice from the lethal infection with encephalomyocarditis virus. Mice treated with MoIFN-gamma-R neutralized the protective effect of IFN-gamma.