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Smad3 promotes cancer progression by inhibiting E4BP4-mediated NK cell development

Patrick Ming-Kuen Tang1,2, Shuang Zhou2,3,4, Xiao-Ming Meng2

  • 1Department of Anatomical and Cellular Pathology, The Chinese University of Hong Kong, Hong Kong SAR 999077, China.

Nature Communications
|March 7, 2017
PubMed

Insights

Smad3 in the tumor microenvironment suppresses natural killer (NK) cell activity, promoting cancer. Inhibiting Smad3 enhances NK cell function and combats tumor growth, offering a new cancer treatment strategy.

Area of Science:

  • Immunology
  • Cancer Biology
  • Molecular Biology

Background:

  • Transforming growth factor-beta (TGF-β) signaling is implicated in tumor progression.
  • The specific role of Smad3 within the tumor microenvironment in regulating cancer progression requires further elucidation.

Purpose of the Study:

  • To investigate the role of Smad3 in the tumor microenvironment on cancer progression.
  • To explore the potential of targeting Smad3 for cancer therapy.

Main Methods:

  • Utilized two syngeneic mouse tumor models with Smad3 deletion or inhibition.
  • Analyzed Natural Killer (NK) cell populations and function in vitro and in vivo.
  • Identified Smad3 target genes using molecular biology techniques.
  • Administered Smad3 inhibitor SIS3 systemically.

Main Results:

  • Deletion or inhibition of Smad3 in the tumor microenvironment suppressed tumor growth, invasion, and metastasis.
  • Smad3-deficient bone marrow led to an expanded NK cell population with enhanced tumor-suppressive activity.
  • Smad3 was found to suppress NK cell differentiation and IFN-γ transcription via E4BP4.
  • Treatment with Smad3 inhibitor SIS3 effectively suppressed cancer progression.

Conclusions:

  • Smad3-E4BP4 axis suppresses NK cell-mediated immunosurveillance, contributing to cancer progression.
  • Targeting the Smad3-dependent tumor microenvironment presents a promising anti-cancer strategy.
  • Disrupting Smad3 enhances NK cell differentiation and anti-cancer functions.

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