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The antileukemia activity of a human anti-CD40 antagonist antibody, HCD122, on human chronic lymphocytic leukemia cells.

Luqman, Mohammad and Klabunde, Sha and Lin, Karen and Georgakis, Georgios V. and Cherukuri, Anu and Holash, Jocelyn and Goldbeck, Cheryl and Xu, Xiaomei and Kadel, Edward E. and Lee, Sang Hoon and Aukerman, Sharon and Jallal, Bahija and Aziz, Natasha and Weng, Wen-Kai and Wierda, William and O'Brien, Susan and Younes, Anas (2008) The antileukemia activity of a human anti-CD40 antagonist antibody, HCD122, on human chronic lymphocytic leukemia cells. Blood, 112 (3). pp. 711-720. ISSN 1528-0020

Abstract

B-cell chronic lymphocytic leukemia (B-CLL) is a lymphoproliferative disorder characterized by the surface expression of CD20, CD5 antigens, as well as the receptor CD40. Activation of CD40 by its ligand (CD40L) induces proliferation and rescues the cells from spontaneous and chemotherapy-induced apoptosis. CD40 activation also induces secretion of cytokines, such as IL-6, IL-10, TNF-alpha, IL-8, and GM-CSF, which are involved in tumor cell survival, migration, and interaction with cells in the tumor microenvironment. Here we demonstrate that in primary B-CLL tumor cells, the novel antagonist anti-CD40 monoclonal antibody, HCD122, inhibits CD40L-induced activation of signaling pathways, proliferation and survival, and secretion of cytokines. Furthermore, HCD122 is also a potent mediator of antibody-dependent cellular cytotoxicity (ADCC), lysing B-CLL cells more efficiently than rituximab in vitro, despite a significantly higher number of cell surface CD20 binding sites compared with CD40. Unlike rituximab, however, HCD122 (formerly CHIR-12.12) does not internalize upon binding to the cells. Our data suggest that HCD122 may inhibit B-CLL growth by blocking CD40 signaling and by ADCC-mediated cell lysis.

Item Type: Article
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Additional Information: author can archive post-print (ie final draft post-refereeing); On author's personal web site or On departmental web site
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Date Deposited: 14 Dec 2009 13:56
Last Modified: 31 Jan 2013 01:09
URI: https://oak.novartis.com/id/eprint/683

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