A humanized recombinant IgG4 monoclonal antibody directed against the alpha4 subunit of the integrins alpha4beta1 and alpha4beta7 with immunomodulating, anti-inflammatory, and potential antineoplastic activities. Natalizumab binds to the apha4-subunit of alpha4beta1 and alpha4beta7 integrins expressed on the surface of all leukocytes except neutrophils, inhibiting the alpha4-mediated adhesion of leukocytes to counter-receptor(s) such as vascular cell adhesion molecule-1 (VCAM-1); natalizumab
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