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Project 4: Role of Receptor Tyrosine Kinase AXL in HNSCC Therapy Resistance

项目 4：受体酪氨酸激酶 AXL 在 HNSCC 治疗抵抗中的作用

基本信息

批准号：
9146601
负责人：
DERIC L WHEELER
金额：
$ 24.71万
依托单位：
UNIVERSITY OF WISCONSIN-MADISON
依托单位国家：
美国
项目类别：
财政年份：
资助国家：
美国
起止时间：
至
项目状态：
未结题

来源：
https://reporter.nih.gov/project-details/9146601
关键词：
Ablation Antibodies Apoptosis Biological Markers Biological Models Biopsy Caspase Cell Line Cessation of life Cetuximab Clinic Clinical Clinical Research Clinical Trials Combined Modality Therapy Cyclophosphamide Data Diagnosis Diagnostic Distant Metastasis Down-Regulation ERBB3 gene Epidermal Growth Factor Receptor Future Genetic Goals Head and Neck Cancer Head and Neck Squamous Cell Carcinoma Human Human Papillomavirus In Vitro Investigation Knowledge Laboratories Malignant Neoplasms Mediating Metastatic/Recurrent Modeling Molecular Molecular Target Monoclonal Antibodies Neoplasm Metastasis Newly Diagnosed Operative Surgical Procedures PI3K/AKT Pathogenesis Pathologic Pathologist Pathway interactions Patients Phosphotransferases Physicians Play Proliferation Marker Proteomics Radiation Radiosurgery Receptor Protein-Tyrosine Kinases Refractory Relapse Resected Resistance Role S-Phase Fraction Scientist Series Signal Transduction Specimen Survival Rate Testing Therapeutic Translating Translations Treatment outcome United States Universities Wisconsin Xenograft procedure base cancer therapy chemotherapy cohort experience improved in vivo in vivo Model innovation insight mouse model novel novel therapeutics overexpression predictive marker research study resistance mechanism response small hairpin RNA small molecule inhibitor src-Family Kinases targeted agent therapeutic target therapy resistant tumor tumor growth

项目摘要

PROJECT SUMMARY The primary objective of this proposal is to examine the receptor tyrosine kinase AXL as a driver of cetuximab resistance in Head and Neck Cancer (HNC). Cetuximab, a monoclonal antibody targeting the EGFR, is the only approved molecular targeting agent in the management of HNC. Despite well established benefit, the majority of patients do not respond to cetuximab, and those who do respond ultimately manifest resistance. Intrinsic and acquired resistance to cetuximab is a major obstacle to improving treatment outcome in HNSCC. Further, limited molecular understanding of cetuximab resistance mechanisms reveals a gap in knowledge in HNC therapy. To identify novel, targetable mechanisms of cetuximab resistance in HNC we employ human tumors, patient-derived xenografts (PDXs), and several models of intrinsic and acquired resistance. We have identified that 1) AXL is overexpressed in HNC and is significantly associated with higher pathologic grade, metastases, and shorter survival, 2) PDXs resistant to cetuximab have high AXL expression compared to cetuximab-sensitive PDXs, and AXL blockade can re-sensitize resistant tumors, 3) overexpression of AXL in cetuximab-sensitive HNC lines render them resistant, whereas kinase dead AXL lines retain sensitivity, 4) therapeutic targeting of AXL can restore sensitivity to cetuximab in the resistant setting and 5) a unique mechanism of resistance is identified where AXL activates Src Family Kinases (SFKs) leading to sustained HER3 signaling. In this proposal we hypothesize that AXL plays an important role in HNC pathogenesis and therapeutic resistance to cetuximab and that AXL mediates resistance by activating the HER3/PI3K/Akt axis via SFKs. To test this hypothesis, we will determine 1) if AXL mediates cetuximab resistance in HNC via a unique circuit involving the SFKs and HER3 (2) If targeting AXL in cetuximab-resistant HNC tumors can increase the efficacy of cetuximab in HNC (3) if AXL serves as a biomarker for cetuximab-resistance in HNC and 4) if cetuximab-resistant tumors, taken directly from patients, can be sensitized to cetuximab by inhibiting AXL signaling. To carry out these studies we have assembled a strong team of molecular biologists, translational physician-scientists, pathologists and biostatisticians. This investigative strategy holds great promise for translation to the clinic and brings innovation by leveraging new molecular insights to a significant existing problem in HNC.

项目总结