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Tyk2 is a tumor suppressor in colorectal cancer

Stefan Moritsch1, Bernadette Mödl1, Irene Scharf1

  • 1Center for Cancer Research, Medical University of Vienna & Comprehensive Cancer Center, Vienna, Austria.

Oncoimmunology
|October 3, 2022
PubMed

Insights

Tyk2 (Janus kinase Tyk2) suppresses colorectal cancer (CRC) by regulating immune cells and epithelial cells. Its absence impairs immune surveillance and promotes tumor growth, highlighting its dual role in CRC prevention.

Area of Science:

  • Immunology
  • Oncology
  • Molecular Biology

Background:

  • Janus kinase Tyk2 (Tyk2) is involved in immune surveillance, but its specific role in solid tumors, particularly colorectal cancer (CRC), remains unclear.
  • Understanding Tyk2's cell-type-specific functions is crucial for developing targeted cancer therapies.

Purpose of the Study:

  • To investigate the cell type-specific functions of Tyk2 in the development of chemically induced colorectal cancer.
  • To elucidate the mechanisms by which Tyk2 influences tumor progression and immune evasion in CRC.

Main Methods:

  • Utilized Tyk2 knockout (Tyk2Δ/Δ) and conditional knockout mouse models (Tyk2ΔHem, Tyk2ΔIEC) in a chemically induced CRC model (AOM-DSS).
  • Performed RNA-sequencing and proteomics to analyze tumor immune microenvironment and gene expression profiles.
  • Assessed tumor burden, immune cell infiltration (CD8+ T cells), and expression of immune checkpoints (Ido1) and IFNγ signatures.

Main Results:

  • All Tyk2-deficient models exhibited increased tumor burden, indicating a tumor-suppressive role for Tyk2.
  • Deletion of Tyk2 in both hematopoietic and intestinal epithelial cells significantly promoted carcinoma formation.
  • Tyk2 deficiency led to distinct immunoediting patterns, with altered IFNγ signatures and Ido1 expression, impacting CD8+ T cell infiltration and immune evasion strategies.

Conclusions:

  • Tyk2 plays a critical tumor-suppressive role in both immune and epithelial compartments of colorectal cancer.
  • Tyk2 prevents Indoleamine 2,3-dioxygenase 1 (Ido1) expression in CRC cells and enhances immune surveillance in the tumor stroma.
  • Coordinated action of Tyk2 in immune and epithelial cells is essential for preventing colorectal cancer progression.
Keywords:
3-dioxygenase 1 Ido1azoxymethane AOMcolitis-associated colorectal cancerdextran sulfate salt DSSindoleamine 2interferon gamma

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