PreprintCited by 33Protein Kinase Regulation and GTPase SignalingMelanoma and MAPK PathwaysProtein Tyrosine Phosphatases

A Novel Pan-RAS Inhibitor with a Unique Mechanism of Action Blocks Tumor Growth in Mouse Models of GI Cancer

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Foote, Jeremy B., Mattox, Tyler E., Keeton, Adam B., Chen, Xi, Smith, Forrest, Berry, Kristy L., Holmes, Thomas, Wang, Junwei +27 more·2023·bioRxiv (Cold Spring Harbor Laboratory)

Abstract

Here, we describe a novel pan-RAS inhibitor, ADT-007, that potently inhibited the growth of RAS mutant cancer cells irrespective of the RAS mutation or isozyme. RAS WT cancer cells with GTP-activated RAS from upstream mutations were equally sensitive. Conversely, RAS WT cancer cells harboring downstream BRAF mutations and normal cells were essentially insensitive to ADT-007. Sensitivity of cancer cells to ADT-007 required activated RAS and dependence on RAS for proliferation, while insensitivity was attributed to metabolic deactivation by UDP-glucuronosyltransferases expressed in RAS WT and normal cells but repressed in RAS mutant cancer cells. ADT-007 binds nucleotide-free RAS to block GTP activation of effector interactions and MAPK/AKT signaling, resulting in mitotic arrest and apoptosis. ADT-007 displayed unique advantages over mutant-specific KRAS and pan-KRAS inhibitors, as well as other pan-RAS inhibitors that could impact in vivo antitumor efficacy by escaping compensatory mechanisms leading to resistance. Local administration of ADT-007 showed robust antitumor activity in syngeneic immune-competent and xenogeneic immune-deficient mouse models of colorectal and pancreatic cancer. The antitumor activity of ADT-007 was associated with the suppression of MAPK signaling and activation of innate and adaptive immunity in the tumor immune microenvironment. Oral administration of ADT-007 prodrug also inhibited tumor growth, supporting further development of this novel class of pan-RAS inhibitors for RAS-driven cancers. SIGNIFICANCE: ADT-007 has unique pharmacological properties with distinct advantages over other RAS inhibitors by circumventing resistance and activating antitumor immunity. ADT-007 prodrugs and analogs with oral bioavailability warrant further development for RAS-driven cancers.

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Crossref · 10.1101/2023.05.17.541233

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Authors
Foote, J. B., Mattox, T. E., Keeton, A. B., Chen, X., Smith, F., Berry, K. L., Holmes, T., Wang, J., Huang, C.-H., Ward, A. B., Mitra, A. K., Ramirez-Alcantara, V., Hardy, C., Fleten, K. G., Flatmark, K., Yoon, K. J., Sarvesh, S., Nagaraju, G. P., Bandi, D. S. R., Maxuitenko, Y. Y., Valiyaveettil, J., Carstens, J. L., Buchsbaum, D. J., Yang, J., Zhou, G., Nurmemmedov, E., Babic, I., Gaponenko, V., Abdelkarim, H., Boyd, M. R., Gorman, G. S., Manne, U., Bae, S., El-Rayes, B. F., & Piazza, G. A.
Affiliations
  • University of Alabama at Birmingham (US)
  • University of South Alabama (US)
  • University of Illinois Chicago (US)
  • Auburn University (US)
  • University of Connecticut (US)
  • Augusta University (US)
Corresponding author
Piazza, Gary A.
Venue
bioRxiv (Cold Spring Harbor Laboratory)
Publisher
openRxiv
Published
2023-05-19
OpenAlex
W4377092453
Cited by
13
References
51
Citations by year
2026: 1 · 2025: 6 · 2024: 6
Type
posted content
Language
en
Open access
Locations
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (submittedVersion)
Funders
National Cancer Institute (R01CA238514, R01CA264983, R01CA254197)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Melanoma and MAPK Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
Keywords
pan-RAS inhibitors, RAS mutations, BRAF mutation, UDP-glucuronosyltransferase, MAPK signaling, Akt signaling, mitotic arrest, apoptosis, colorectal cancer, pancreatic cancer, tumor immune microenvironment, antitumor immunity, prodrugs, oral bioavailability, drug resistance

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