Abstract
Multiple sclerosis (MS) is an immunopathological, presumably autoimmune, disease of the CNS. Several immunomodulatory treatments, including various preparations of interferon-β, glatiramer acetate and mitoxantrone, have been approved for MS therapy. Because these agents are only partially effective, the search for better therapies continues. Therapeutic monoclonal antibodies (mAbs), a class of biotechnological agents, allow the precise targeting of molecules involved in pathological processes. Therapeutic mAbs have shown much promise in the treatment of many disorders, including inflammatory and putative autoimmune diseases such as MS. These agents have intrinsic limitations, however, such as induction of neutralizing 'anti-antibodies', systemic inflammatory reactions and severe adverse effects, some of which remain to be explained. Most notably, natalizumab (Tysabri®), a mAb against α4 integrin, was very effective in suppressing MS activity, but had to be withdrawn from the market because several treated patients developed progressive multifocal leukoencephalopathy. This article reviews the state of development of various therapeutic mAbs for MS treatment.
Key Points
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The development of therapeutic strategies for multiple sclerosis (MS) has followed the evolution of pathogenetic concepts, and current models of immunopathogenesis offer numerous molecular targets for monoclonal antibody (mAb) therapy
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The initial goal of mAb treatment was to deplete subsets of immune cells that were suspected to be pathogenically important, but evidence has accumulated to suggest that non-depleting mAbs can also have subtle immunoregulatory effects
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Because T cells are considered to have a central role in MS, they are primary therapeutic targets. Other potential targets include various costimulatory molecules, adhesion molecules and cytokines
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Despite promising results in animal models, clinical experience has shown that mAb treatment can have unexpected effects and adverse reactions when applied to patients. Some mAbs, however, have shown sufficient promise to justify cautious optimism that they might find a place in MS therapy
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Acknowledgements
The authors thank Dr Emanuelle Waubant for sharing information on rituximab trials, and gratefully acknowledge the support of the Max-Planck Society, Deutsche Forschungsgemeinschaft (DFG, SFB 571), and Hermann and Lilly Schilling Foundation.
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Reinhard Hohlfeld participated in clinical trials of Tysabri and received grant support and consultancy fees from Biogen Idec.
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Hohlfeld, R., Wekerle, H. Drug Insight: using monoclonal antibodies to treat multiple sclerosis. Nat Rev Neurol 1, 34–44 (2005). https://doi.org/10.1038/ncpneuro0016
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DOI: https://doi.org/10.1038/ncpneuro0016
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