Immunotherapy has the potential to be a powerful tool for cancer treatment. Yet, despite intensive research with both unmodified and conjugated monoclonal antibodies (mAbs), such reagents have yet to achieve their envisioned success. A true evaluation of the efficacy of cancer immunotherapy would be afforded by access to human antibodies against appropriate cell-surface markers that allow the specific targeting of tumor cells. In this way, a therapeutic antibody could be administered with uncompromised dosing protocols. We present a strategy wherein antibody phage-display technology, in conjunction with the synthesis of structurally defined carbohydrate """"""""panning reagents"""""""" analogous to tumor antigens, can be used to obtain human mAbs against tumor-associated antigens. First, human antibodies would allow the full exploitation of passive immunological treatments for various cancers, since the antibody composition is native to humans. Second, the glycosphingolipids (GSLs) and glycoproteins are currently the most well known distinguishing markers available for specifically targeting tumor cells. Using our expertise in antibody-phage technology we will construct novel single chain antibody (scFv) libraries from the blood of cancer patients as a source of human mAbs. With our experience in chemoenzymatic synthesis, we will prepare panning reagents based on the structures of tumor-associated GSLs and glycoproteins for direct in vitro selection. Selection techniques pioneered in our laboratory will provide a means to obtain human scFvs with high affinity and well-defined specificity against a designated panel of panning reagents. We will use advanced antibody engineering techniques to perform affinity maturation of the initially selected antibodies to refine tumor-antigen specificity within the specific cancer cell line. Finally, we will also engineer our scFvs to provide human monoclonal whole IgG, as well as scFv immunopharmacological reagents. Both constructs will be applicable to passive immunotherapeutic paradigms. Our approach would enable, for the first time, the complete assessment of the efficacy of immunotherapy for cancer treatment.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI047127-02
Application #
6497373
Study Section
Bio-Organic and Natural Products Chemistry Study Section (BNP)
Program Officer
Johnson, David R
Project Start
2001-02-01
Project End
2005-01-31
Budget Start
2002-02-01
Budget End
2003-01-31
Support Year
2
Fiscal Year
2002
Total Cost
$221,625
Indirect Cost
Name
Scripps Research Institute
Department
Type
DUNS #
City
La Jolla
State
CA
Country
United States
Zip Code
92037
Kim, Youngsoo; Lillo, Antonietta M; Steiniger, Sebastian C J et al. (2006) Targeting heat shock proteins on cancer cells: selection, characterization, and cell-penetrating properties of a peptidic GRP78 ligand. Biochemistry 45:9434-44
Felding-Habermann, Brunhilde; Lerner, Richard A; Lillo, Antonietta et al. (2004) Combinatorial antibody libraries from cancer patients yield ligand-mimetic Arg-Gly-Asp-containing immunoglobulins that inhibit breast cancer metastasis. Proc Natl Acad Sci U S A 101:17210-5
Lillo, Antonietta M; Sun, Chengzao; Gao, Changshou et al. (2004) A human single-chain antibody specific for integrin alpha3beta1 capable of cell internalization and delivery of antitumor agents. Chem Biol 11:897-906
Gao, Changshou; Mao, Shenlan; Ronca, Francesca et al. (2003) De novo identification of tumor-specific internalizing human antibody-receptor pairs by phage-display methods. J Immunol Methods 274:185-97
Sun, Chengzao; Wirsching, Peter; Janda, Kim D (2003) Enabling ScFvs as multi-drug carriers: a dendritic approach. Bioorg Med Chem 11:1761-8
Delgado, Mercedes; Lee, Kyung Joo; Altobell 3rd, Lawrence et al. (2002) A parallel approach to the discovery of carrier delivery vehicles to enhance antigen immunogenicity. J Am Chem Soc 124:4946-7
Davis, R S; Dennis Jr, G; Kubagawa, H et al. (2002) Fc receptor homologs (FcRH1-5) extend the Fc receptor family. Curr Top Microbiol Immunol 266:85-112
Lee, Kyung Joo; Mao, Shenlan; Sun, Chengzao et al. (2002) Phage-display selection of a human single-chain fv antibody highly specific for melanoma and breast cancer cells using a chemoenzymatically synthesized G(M3)-carbohydrate antigen. J Am Chem Soc 124:12439-46
Sun, Chengzao; Wirsching, Peter; Janda, Kim D (2002) Syntheses of dendritic linkers containing chlorambucil residues for the preparation of antibody-multidrug immunoconjugates. Bioorg Med Chem Lett 12:2213-5