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Generation and characterization of a novel tetravalent anti-CD22 antibody with improved antitumor activity and pharmacokinetics.

Abstract：

:The purpose of this study was to prepare a tetravalent anti-human CD22 recombinant antibody with improved antitumor activity and a half life longer than that of its divalent counterpart. We compared the ability of tetravalent vs. divalent antibody to associate/dissociate to/from CD22-positive Daudi cells, to interact with murine and human Fcgamma receptors (FcgammaR), to bind human complement component C1q, to inhibit the growth of tumor cells, to diffuse into various tissues, to be internalized by Daudi cells, to react with human neonatal Fc receptors (FcRn), and to persist in the circulation of normal mice. As compared to the murine or chimeric divalent antibodies, the chimeric tetravalent counterpart has a longer half life in mice. It also has an affinity for FcRns that is identical to that of human IgG. The tetravalent antibody has increased antitumor activity in vitro and completely conserved effector functions (binding to FcgammaR-positive cells and to C1q) in vitro. Despite its 33% higher molecular weight, it penetrates mouse tissues as well as its divalent antibody counterpart. Based on the improved in vitro performance and pharmacokinetics of the tetravalent antibody it will now be tested for its antitumor activity in vivo.

journal_name

Int Immunopharmacol

journal_title

International immunopharmacology

authors

Liu XY,Pop LM,Roopenian DC,Ghetie V,Vitetta ES,Smallshaw JE

doi

10.1016/j.intimp.2005.11.022

keywords:

subject

Has Abstract

pub_date

2006-05-01 00:00:00

pages

791-9

issue

5

eissn

1567-5769

issn

1878-1705

pii

S1567-5769(05)00335-8

journal_volume

6

pub_type

杂志文章

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