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Title: Inhibition of the GAS6/AXL pathway augments the efficacy of chemotherapies

Journal Article · · Journal of Clinical Investigation
DOI:https://doi.org/10.1172/JCI85610· OSTI ID:1361055
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  1. Stanford Univ. of Medicine, CA (United States). Dept. of Radiation Oncology
  2. Stanford Univ., CA (United States). Dept. of Bioengineering
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource

The AXL receptor and its activating ligand, growth arrest–specific 6 (GAS6), are important drivers of metastasis and therapeutic resistance in human cancers. Given the critical roles that GAS6 and AXL play in refractory disease, this signaling axis represents an attractive target for therapeutic intervention. But, the strong picomolar binding affinity between GAS6 and AXL and the promiscuity of small molecule inhibitors represent important challenges faced by current anti-AXL therapeutics. We have addressed these obstacles by engineering a second-generation, high-affinity AXL decoy receptor with an apparent affinity of 93 femtomolar to GAS6. Our decoy receptor, MYD1-72, profoundly inhibited disease progression in aggressive preclinical models of human cancers and induced cell killing in leukemia cells. When directly compared with the most advanced anti-AXL small molecules in the clinic, MYD1-72 achieved superior antitumor efficacy while displaying no toxicity. Furthermore, we uncovered a relationship between AXL and the cellular response to DNA damage whereby abrogation of AXL signaling leads to accumulation of the DNA-damage markers γH2AX, 53BP1, and RAD51. MYD1-72 exploited this relationship, leading to improvements upon the therapeutic index of current standard-of-care chemotherapies in preclinical models of advanced pancreatic and ovarian cancer.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1361055
Journal Information:
Journal of Clinical Investigation, Vol. 127, Issue 1; ISSN 0021-9738
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 67 works
Citation information provided by
Web of Science

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Cited By (11)

GAS6-expressing and self-sustaining cancer cells in 3D spheroids activate the PDK-RSK-mTOR pathway for survival and drug resistance journal July 2017
Stromal Gas6 promotes the progression of premalignant mammary cells journal December 2018
Tumor-associated macrophage-secreted 14-3-3ζ signals via AXL to promote pancreatic cancer chemoresistance journal April 2019
AXL degradation in combination with EGFR-TKI can delay and overcome acquired resistance in human non-small cell lung cancer cells journal May 2019
Small molecule inhibitors block Gas6-inducible TAM activation and tumorigenicity journal March 2017
AXL receptor tyrosine kinase as a promising anti-cancer approach: functions, molecular mechanisms and clinical applications journal November 2019
The bone marrow microenvironment in health and disease at a glance journal February 2018
Soluble AXL as a marker of disease progression and survival in melanoma journal January 2020
AXL Receptor Tyrosine Kinase as a Therapeutic Target in Hematological Malignancies: Focus on Multiple Myeloma journal November 2019
Tumour-Secreted Protein S (ProS1) Activates a Tyro3-Erk Signalling Axis and Protects Cancer Cells from Apoptosis journal November 2019
Dynamics of Axl Receptor Shedding in Hepatocellular Carcinoma and Its Implication for Theranostics journal December 2018

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