Anti-DLL4 Inhibits Growth and Reduces Tumor-Initiating Cell Frequency in Colorectal Tumors with Oncogenic KRAS Mutations
Autor: | John Lewicki, Austin L. Gurney, Min Wang, Timothy Hoey, Gilbert O'Young, Ann M. Kapoun, Marcus Fischer, Wan-Ching Yen |
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Rok vydání: | 2011 |
Předmět: |
Cancer Research
Colorectal cancer Fluorescent Antibody Technique Antineoplastic Agents Apoptosis Enzyme-Linked Immunosorbent Assay Cell Separation Mice SCID Biology Irinotecan medicine.disease_cause Proto-Oncogene Proteins p21(ras) Mice Proto-Oncogene Proteins medicine Animals Humans neoplasms Adaptor Proteins Signal Transducing Cetuximab Reverse Transcriptase Polymerase Chain Reaction Calcium-Binding Proteins Intracellular Signaling Peptides and Proteins Wild type Antibodies Monoclonal Membrane Proteins Cancer Flow Cytometry medicine.disease Immunohistochemistry Xenograft Model Antitumor Assays digestive system diseases Oncology Mutation Neoplastic Stem Cells ras Proteins cardiovascular system Cancer research Camptothecin KRAS Stem cell Colorectal Neoplasms Carcinogenesis medicine.drug |
Zdroj: | Cancer Research. 71:1520-1525 |
ISSN: | 1538-7445 0008-5472 |
Popis: | KRAS mutations are frequent in colorectal cancer (CRC) and are associated with clinical resistance to treatment with the epidermal growth factor receptor (EGFR)–targeted monoclonal antibodies. Delta-like 4 ligand (DLL4) is an important component of the Notch signaling pathway and mediates stem cell self-renewal and vascular development. DLL4 inhibition in colon tumor cells reduces tumor growth and stem cell frequency. Considering the need for new drugs to treat colon cancers with oncogenic KRAS mutations, we examined in this study the efficacy of anti-DLL4 antibodies in KRAS mutant tumors in a panel of early passage colon tumor xenograft models derived from patients. Consistent with clinical findings, mutant KRAS colorectal xenograft tumors were insensitive to the EGFR therapeutic antibody cetuximab, whereas KRAS wild-type tumors responded to cetuximab. In contrast, anti-DLL4 was efficacious against both wild-type and mutant KRAS colon tumors as a single agent and in combination with irinotecan. Further analysis of mutant KRAS tumors indicated that the anti-DLL4/irinotecan combination produced a significant decrease in colon cancer stem cell frequency while promoting apoptosis in tumor cells. Our findings provide a rationale for targeting DLL4-Notch signaling for improved treatment of CRC patients with activating KRAS mutations. Cancer Res; 71(5); 1520–5. ©2010 AACR. |
Databáze: | OpenAIRE |
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