The CD40 agonist antibody CP-870,893 enhances dendritic cell and B-cell activity and promotes anti-tumor efficacy in SCID-hu mice.

Abstract

CD40 is a member of the TNF family of receptors that has been shown to play a crucial role in enhancing dendritic cell activity and fostering anti-tumor immune responses. In this study, we demonstrate the in vitro properties and in vivo efficacious activity of the CD40 agonist antibody, CP-870,893. CP-870,893 is a fully human, IgG2 antibody that selectively interacts with CD40 at a site distinct from its ligand-binding region with a KD of 0.4 nM. It enhances the expression of MHC class II, CD54, CD86, and CD23 on human B cells in vitro. CP-870,893 also enhances dendritic cell activity as evidenced by cytokine secretion (IL-12, IL-23, IL-8), the upregulation of CD86 and CD83, and the ability to prime T cells to secrete IFNγ. In SCID-beige mice, a single parenteral injection of CP-870,893 was therapeutically effective against several CD40(pos) human tumors (B-cell lymphoma, breast, colon, and prostate) indicating direct effects on tumor cell survival and/or growth. When mice were co-implanted with human T cells and dendritic cells, the activity of CP-870,893 against CD40(pos) tumors increased, and efficacy was also observed against CD40(neg) and CD40(low) tumors demonstrating the ability of CP-870,893 to enhance anti-tumor immune function in vivo. These studies suggest that CP-870,893 has the potential to be efficacious against a wide range of tumor types through both direct and immune-mediated effects.

• Authors: Ronald P Gladue, Timothy Paradis, Susan H Cole, Carol Donovan, Robin Nelson, Robbin Alpert, Joe Gardner, Ed Natoli, Eileen Elliott, Richard Shepard, Vahe Bedian
• Journal: Cancer immunology, immunotherapy : CII (Cancer Immunol Immunother) Vol. 60 Issue 7 Pg. 1009-17 (Jul 2011) ISSN: 1432-0851 [Electronic] Germany
• PMID: 21479995 (Publication Type: Journal Article)

Chemical References

• Antibodies, Monoclonal
• Antibodies, Monoclonal, Humanized
• CD40 Antigens
• Cytokines
• selicrelumab

Topics

• Animals
• Antibodies, Monoclonal (physiology)
• Antibodies, Monoclonal, Humanized
• B-Lymphocytes (cytology, immunology)
• CD40 Antigens (immunology)
• Cells, Cultured
• Cytokines (metabolism)
• Dendritic Cells (cytology, immunology)
• Flow Cytometry
• Humans
• Lymphocyte Activation
• Mice
• Mice, SCID
• Neoplasms, Experimental (immunology, prevention & control)