Cited by 389Pancreatic and Hepatic Oncology ResearchTGF-β signaling in diseasesCancer Immunotherapy and Biomarkers

Regulatory T-cell Depletion Alters the Tumor Microenvironment and Accelerates Pancreatic Carcinogenesis

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Zhang, Yaqing, Lazarus, Jenny, Steele, Nina G., Yan, Wei, Lee, Ho-Joon, Nwosu, Zeribe C., Halbrook, Christopher J., Menjivar, Rosa E. +15 more·2020·Cancer Discovery

Published version of a preprint

Abstract

Regulatory T cells (Treg) are abundant in human and mouse pancreatic cancer. To understand the contribution to the immunosuppressive microenvironment, we depleted Tregs in a mouse model of pancreatic cancer. Contrary to our expectations, Treg depletion failed to relieve immunosuppression and led to accelerated tumor progression. We show that Tregs are a key source of TGFβ ligands and, accordingly, their depletion reprogramed the fibroblast population, with loss of tumor-restraining, smooth muscle actin–expressing fibroblasts. Conversely, we observed an increase in chemokines Ccl3, Ccl6, and Ccl8 leading to increased myeloid cell recruitment, restoration of immune suppression, and promotion of carcinogenesis, an effect that was inhibited by blockade of the common CCL3/6/8 receptor CCR1. Further, Treg depletion unleashed pathologic CD4+ T-cell responses. Our data point to new mechanisms regulating fibroblast differentiation in pancreatic cancer and support the notion that fibroblasts are a heterogeneous population with different and opposing functions in pancreatic carcinogenesis. Significance: Here, we describe an unexpected cross-talk between Tregs and fibroblasts in pancreatic cancer. Treg depletion resulted in differentiation of inflammatory fibroblast subsets, in turn driving infiltration of myeloid cells through CCR1, thus uncovering a potentially new therapeutic approach to relieve immunosuppression in pancreatic cancer. See related commentary by Aykut et al., p. 345. This article is highlighted in the In This Issue feature, p. 327

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  • The positive effect of Tregs depletion (increase in CD8+ T cells) was negated by an increase in other CD4+ Th cells, immunosuppressive myeloid cells, and fibroblast populations, ultimately failing to inhibit tumor growth.

    “Additionally, this study analyzed tissue levels and found that the positive effect of Tregs depletion, which results in an increase in CD8+ T cells, was negated by an increase in other CD4+ Th cells, immunosuppressive myeloid cells, and fibroblast populations, ultimately failing to inhibit tumor growth [116, 131] (Fig. 2E).”

    From Potential anti-tumor effects of regulatory T cells in the tumor microenvironment: a review (2024) · cites this paper as [116]

    The Results sections on immune cells and CD4+ T cells report a modest CD8+ T-cell increase, increased suppressive myeloid cells and other CD4+ T cells after Treg depletion. The late-stage disease Results report continued tumor growth despite increased CD8+ T cells. However, the fibroblast Results explicitly report no increase in total fibroblast numbers; the population was reprogrammed, with fewer SMA+ fibroblasts. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Other T cell populations in the PDAC TME, including Th17, Th22, CD4, and γδ T cells, play protumorigenic roles.

    “Other T cell populations within the TME have all been noted to play protumorigenic roles, including Th17, Th22, CD4, and γδ T cells188–191”

    From Pancreatic cancer: Advances and challenges (2023) · cites this paper as [191]

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Authors
Zhang, Y., Lazarus, J., Steele, N. G., Yan, W., Lee, H.-J., Nwosu, Z. C., Halbrook, C. J., Menjivar, R. E., Kemp, S. B., Sirihorachai, V. R., Velez-Delgado, A., Donahue, K., Carpenter, E. S., Brown, K. L., Irizarry-Negron, V., Nevison, A. C., Vinta, A., Anderson, M. A., Crawford, H. C., Lyssiotis, C. A., Frankel, T. L., Bednar, F., & Pasca di Magliano, M.
Affiliations
  • University of Michigan (US)
  • 1Department of Surgery, University of Michigan, Ann Arbor, Michigan.
Corresponding author
  • Zhang, Yaqing
  • Bednar, Filip
Venue
Cancer Discovery
Published
2020-03-01
Volume
10
Issue
3
Pages
422-439
ISSN
  • 2159-8274 (ISSN-L)
  • 2159-8290
OpenAlex
W3000274143
Cited by
385
References
73
Citations by year
2026: 34 · 2025: 49 · 2024: 73 · 2023: 62 · 2022: 66 · 2021: 70 · 2020: 30
FWCI
20.58
Type
journal article
Language
en
Open access
Locations
  • Cancer Discovery (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • HHS | NIH | National Cancer Institute (R01CA151588, R01CA198074, U01CA224145, P30CA046592, R50CA232985, 3-P30-CA-046592-28-S2, K08CA201581, T32-CA009676)
  • American Cancer Society (Postdoctoral Award)
  • University of Michigan Medical School (Michigan Postdoctoral Pioneer Program)
  • HHS | NIH | National Institute of General Medical Sciences (T32-GM007315, T32-GM113900)
  • Horace H. Rackham School of Graduate Studies, University of Michigan (Rackham Merit Fellowship)
  • Association of Academic Surgery (Joel Roslyn Award)
Topics
  • Health Sciences › Medicine › Oncology › Pancreatic and Hepatic Oncology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › TGF-β signaling in diseases
  • Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
Keywords
regulatory T cells, Treg depletion, pancreatic cancer, tumor microenvironment, immunosuppression, TGF-beta, cancer-associated fibroblasts, CCR1, myeloid cell recruitment, CD4+ T cells, pancreatic carcinogenesis, tumor progression
MeSH terms
Animals, Disease Models, Animal, Fibroblasts, Humans, Pancreas, Pancreatic Neoplasms, Transforming Growth Factor beta, Chemokines, CC, T-Lymphocytes, Regulatory, Mice, Receptors, CCR1, Chemokine CCL3, Chemokine CCL8, Tumor Microenvironment, Carcinogenesis

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