The Medical Letter on Drugs and Therapeutics
Natalizumab (Tysabri) for Relapsing Multiple Sclerosis
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Natalizumab, a recombinant humanized monoclonal antibody, has received accelerated approval from the FDA for intravenous treatment of relapsing forms of multiple sclerosis (MS). The beta interferons and glatiramer acetate are widely used for treatment of MS; they generally reduce the number of relapses by about 30% compared to placebo, and have been shown to be safe and effective for periods ranging from 4 to 10 years.1,2

MECHANISM OF ACTION — Natalizumab is produced in murine myeloma cells. It binds to the α4-subunit of the cell surface adhesion molecule α4ß1 integrin that is expressed on activated lymphocytes and monocytes; this blocks cell adhesion and prevents leukocyte migration across the blood-brain barrier, which may interrupt the inflammatory cascade in MS. In animal models of MS, the drug reduced leukocyte migration into brain parenchyma ... more      

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Title: Natalizumab (Tysabri) for Relapsing Multiple Sclerosis
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