Compared with standard, the range ofbiological activity is 95%
Osmolality
Corresponds to reference standard: PASS
Peptide mapping
Corresponds to reference standard: PASS
N-terminal sequence
Corresponds to reference standard:PASS
Biological activity
Description
Target:
In Vivo
Natalizumab binds rapidly and with high affinity to α4-integrin. Maximal binding (≥80% saturation), measured in vitro on isolated lymphocyte membranes, occurred 24 hours after intravenous (IV) doses of natalizumab 1 mg/kg to 6 mg/kg[1].
In Vitro
Natalizumab, a recombinant, humanized antibody, binds to α4β1-integrin and blocks its interaction with VCAM-1. As a result, leukocyte migration into brain tissue is inhibited, reducing inflammation and preventing the formation of lesions. Natalizumab may also inhibit ongoing central nervous system (CNS) inflammation, mediated by leukocytes already present in the CNS, by interrupting the interactions between α4-integrin-expressing leukocytes and extracellular matrix proteins such as fibronectin and osteopontin[1].
Kinase Assay
Cell Assay
Animal Administration
References
[1]. Hutchinson M. Natalizumab: A new treatment for relapsing remitting multiple sclerosis. Ther Clin Risk Manag. 2007 Jun;3(2):259-68.
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