Abstract
Interferon-tau (IFN-τ) is a type I IFN originally discovered for its role as a pregnancy recognition hormone in ruminant animals such as sheep and cows. IFN-τ possesses all of the biological properties ascribed to the other type I IFNs including antiviral, antiproliferative and immunomodulatory activities. However, IFN-τ differs in that it is relatively nontoxic to cells at high concentrations as compared to the toxicity normally associated with IFNs-α and -β and the type II IFN, IFN-γ.
IFN-τ was examined for its ability to prevent the development of experimental allergic encephalomyelitis (EAE), an animal model for multiple sclerosis (MS), in humans. IFN-τ prevents development of EAE as effectively as IFN-β, a type I IFN currently being used for the treatment of MS. Unlike IFN-β, however, IFN-τ treated mice did not develop leucopenia or experience bodyweight loss indicative of toxicity.
Superantigens can induce relapses in EAE, similar to those that are observed in patients with relapsing-remitting MS; IFN-τ blocks superantigen reactivation of EAE. The inhibitory effect of IFN-τ on induction of EAE and reactivation by superantigen involves suppression of myelin basic protein and superantigen activation of T cells as well as suppressed induction of inflammatory cytokines such as tumour necrosis factor-alpha. In addition, IFN-τ has been shown to reduce immunologically mediated spontaneous fetal resorption. Thus, IFN-τ has considerable potential for treatment of autoimmune and immunologically mediated disorders, including MS.
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Soos, J.M., Johnson, H.M. Interferon-τ. BioDrugs 11, 125–135 (1999). https://doi.org/10.2165/00063030-199911020-00006
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DOI: https://doi.org/10.2165/00063030-199911020-00006