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Parenteral administration of interferon (IFN)-beta is one of the currently approved therapies for multiple sclerosis. One characteristic of this disease is the increased production of gelatinase B, also called matrix metalloproteinase (MMP) 9. Gelatinase B is capable of destroying the blood-brain barrier, and of cleaving myelin basic protein into immunodominant and encephalitogenic fragments, thus playing a functional role and being a therapeutic target in multiple sclerosis. Here we demonstrate that gelatinase B proteolytically cleaves IFN-beta, kills its activity, and hence counteracts this cytokine as an antiviral and immunotherapeutic agent. This proteolysis is more pronounced with IFN-beta-1b than with IFN-beta-1a. Furthermore, the tetracycline minocycline, which has a known blocking effect in experimental autoimmune encephalomyelitis, an in vivo model of acute inflammation in multiple sclerosis, and other MMP inhibitors prevent the in vitro degradation of IFN-beta by gelatinase B. These data provide a novel mechanism and rationale for the inhibition of gelatinase B in diseases in which IFN-beta has a beneficial effect. The combination of gelatinase B inhibitors with better and lower pharmacological formulations of IFN-beta may reduce the side-effects of treatment with IFN-beta, and is therefore proposed for multiple sclerosis therapy and the immunotherapy of viral infections.

Gelatinase B/matrix metalloproteinase‐9 cleaves interferon‐β and is a target for immunotherapy