Cited by 155Pancreatic and Hepatic Oncology ResearchImmune cells in cancerCancer Cells and Metastasis

Tumor Microenvironment Remodeling Enables Bypass of Oncogenic KRAS Dependency in Pancreatic Cancer

Open access
Hou, Pingping, Kapoor, Avnish, Zhang, Qiang, Li, Jiexi, Wu, Chang-Jiun, Li, Jun, Lan, Zhengdao, Tang, Ming +8 more·2020·Cancer Discovery

Published version of a preprint

Abstract

Oncogenic KRAS (KRAS*) is a key tumor maintenance gene in pancreatic ductal adenocarcinoma (PDAC), motivating pharmacologic targeting of KRAS* and its effectors. Here, we explored mechanisms involving the tumor microenvironment (TME) as a potential basis for resistance to targeting KRAS*. Using the inducible KrasG12D;Trp53−/− PDAC mouse model, gain-of-function screens of epigenetic regulators identified HDAC5 as the top hit enabling KRAS* independent tumor growth. HDAC5-driven escaper tumors showed a prominent neutrophil-to-macrophage switch relative to KRAS*-driven tumors. Mechanistically, HDAC5 represses Socs3, a negative regulator of chemokine CCL2, resulting in increased CCL2, which recruits CCR2+ macrophages. Correspondingly, enforced Ccl2 promotes macrophage recruitment into the TME and enables tumor recurrence following KRAS* extinction. These tumor-associated macrophages in turn provide cancer cells with trophic support including TGFβ to enable KRAS* bypass in a SMAD4-dependent manner. Our work uncovers a KRAS* resistance mechanism involving immune cell remodeling of the PDAC TME. Significance: Although KRAS* is required for PDAC tumor maintenance, tumors can recur following KRAS* extinction. The capacity of PDAC cancer cells to alter the TME myeloid cell composition to support KRAS*-independent tumor growth illuminates novel therapeutic targets that may enhance the effectiveness of therapies targeting KRAS* and its pathway components. See related commentary by Carr and Fernandez-Zapico, p. 910. This article is highlighted in the In This Issue feature, p. 890

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Registry

Crossref · 10.1158/2159-8290.cd-19-0597

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  • KRAS G12D boosts GM-CSF production in PDAC cancer cells, thereby attracting immunosuppressive myeloid cells that can dampen the activity of CD8 T-cells.

    “This discovery gains significance considering the ability of KRAS G12D to boost GM-CSF production in PDAC cancer cells, thereby attracting immunosuppressive myeloid cells that can dampen the activity of CD8 T-cells [54].”

    From KRAS: Biology, Inhibition, and Mechanisms of Inhibitor Resistance (2024) · cites this paper as [54]

    The Introduction (page unavailable) says oncogenic KRAS stimulates GM-CSF production in PDAC cancer cells, recruiting myeloid cells that suppress CD8+ T-cell function. It does not specify that this effect is attributable to the G12D variant, so the allele-specific part of the claim is not established by our copy. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • YAP can restore oncogenicity in murine tumors that have lost KRAS.

    “YAP, a pivotal EMT regulator gene, can restore oncogenicity in murine tumors that have lost KRAS [54,131].”
  • In HDAC5-rich tumors, macrophages increase TGFβ production, triggering pSMAD3/SMAD4 signaling in cancer cells and bypassing the need for KRAS.

    “In HDAC5-rich tumors, these macrophages increase TGFβ production, triggering pSMAD3/SMAD4 signaling in cancer cells, and bypassing the need for KRAS.”
  • HDAC5 suppresses SOCS3, boosting CCL2 and CCL7 expression.

    “Specifically, HDAC5 suppresses SOCS3, boosting CCL2 and CCL7 expression.”
  • Gain-of-function screens identified HDAC5 as a driver of resistance to KRAS inhibition within the tumor microenvironment.

    “Gain-of-function screens of epigenetic regulators in KRAS-mutant PDAC models identified HDAC5 as a driver of resistance to KRAS inhibition within the tumor microenvironment [54].”

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Research works printed but not linked: 1

  1. [40]Kapoor A, Yap1 activation enables bypass of oncogenic Kras addiction in pancreatic cancer. Cell 158, 185– 197 (2014). 24954535 PMC4109295

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Authors
Hou, P., Kapoor, A., Zhang, Q., Li, J., Wu, C.-J., Li, J., Lan, Z., Tang, M., Ma, X., Ackroyd, J. J., Kalluri, R., Zhang, J., Jiang, S., Spring, D. J., Wang, Y. A., & DePinho, R. A.
Affiliations
The University of Texas MD Anderson Cancer Center (US)
Corresponding author
  • Wang, Y. Alan
  • DePinho, Ronald A.
Venue
Cancer Discovery
Published
2020-07-01
Volume
10
Issue
7
Pages
1058-1077
ISSN
  • 2159-8274 (ISSN-L)
  • 2159-8290
OpenAlex
W3019483263
Cited by
154
References
57
Citations by year
2026: 17 · 2025: 20 · 2024: 29 · 2023: 30 · 2022: 26 · 2021: 25 · 2020: 7
FWCI
7.94
Type
journal article
Language
en
Open access
Locations
  • Cancer Discovery (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • NIH (P30 CA016672, P01 CA117969, R01 CA225955, R01 CA231349)
  • Hirshberg Foundation for Pancreatic Cancer Research
  • Emerson Collective
Topics
  • Health Sciences › Medicine › Oncology › Pancreatic and Hepatic Oncology Research
  • Life Sciences › Immunology and Microbiology › Immunology › Immune cells in cancer
  • Health Sciences › Medicine › Oncology › Cancer Cells and Metastasis
Keywords
pancreatic ductal adenocarcinoma, KRAS, tumor microenvironment, HDAC5, epigenetic regulators, tumor-associated macrophages, MCP-1, CCR2, SOCS3, TGF-beta, SMAD4, tumor recurrence
MeSH terms
Humans, Oncogenes, Pancreatic Neoplasms, Proto-Oncogene Proteins p21(ras), Tumor Microenvironment

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