Related Experiment Video

Updated: May 28, 2025

Studying the Effects of Tumor-Secreted Paracrine Ligands on Macrophage Activation using Co-Culture with Permeable Membrane Supports
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A novel TLR4 accessory molecule drives hepatic oncogenesis through tumor-associated macrophages

Doyeon Kim1, Carter A Allen2, Dongjun Chung2

  • 1Pelotonia Institute for Immune-Oncology, The Ohio State University Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, 410 W 12th Ave, Columbus, OH, 43210, USA; Division of Medical Oncology, Department of Internal Medicine, The Ohio State University Wexner Medical Center, 410 W 12th Ave, Columbus, OH, 43210, USA.

Cancer Letters
|February 10, 2025
PubMed

Insights

Protein canopy homolog 2 (CNPY2) regulates Toll-like receptor 4 (TLR4) in macrophages, impacting inflammation and liver cancer development. CNPY2 deficiency reduces tumor growth by inhibiting macrophage infiltration and cytokine production.

Area of Science:

  • Immunology
  • Oncology
  • Molecular Biology

Background:

  • Tumor-associated macrophages (TAMs) are key in the tumor microenvironment.
  • The specific roles of TAMs in inflammation-driven cancer are not fully understood.

Purpose of the Study:

  • To investigate the function of protein canopy homolog 2 (CNPY2) in macrophage regulation.
  • To elucidate the mechanisms by which CNPY2 influences inflammation-associated oncogenesis, particularly in liver cancer.

Main Methods:

  • Investigated CNPY2's interaction with Toll-like receptor 4 (TLR4) in macrophages.
  • Utilized macrophage-specific CNPY2 deficiency models and a diethylnitrosamine (DEN)-induced liver cancer model.
  • Performed RNA-sequencing to analyze gene expression changes in Cnpy2 knockout macrophages.

Main Results:

  • CNPY2 directly binds to TLR4, promoting cytokine production in macrophages.
  • CNPY2 deficiency reduces TLR4 expression, NFκB translocation, and macrophage cytokine production.
  • Macrophage-specific CNPY2 deficiency inhibited hepatocarcinogenesis and reduced macrophage infiltration by downregulating VEGF receptors (Flt1, Kdr) via NFκB2/p52 signaling.

Conclusions:

  • CNPY2 is a novel regulator of macrophages involved in both inflammation and hepatocarcinogenesis.
  • CNPY2's role in regulating TLR4 and VEGF receptor expression highlights its potential as a therapeutic target in cancer.
Keywords:
CNPY2Flt1Hepatocellular carcinomaKdrMacrophageNFκBTLR4

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