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Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
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SIX4 Controls Anti-PD-1 Efficacy by Regulating STING Expression.

Beiyuan Liang1, Evan H Zhang1, Zhen Ye1

  • 1Department of Cancer Biology and Genetics, The Ohio State University, Columbus, Ohio.

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|October 27, 2023
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Summary
This summary is machine-generated.

SIX4 regulates STING expression in colon cancer, impacting antitumor immunity. This finding offers a potential biomarker for predicting responses to immune checkpoint blockade therapy.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Oncology

Background:

  • The cyclic GMP-AMP synthase (cGAS)/stimulator of interferon genes (STING) pathway is crucial for antitumor immunity.
  • Reduced or defective STING expression is common in various cancers, impairing immune responses.

Purpose of the Study:

  • To investigate the role of SIX4 in regulating STING expression in colon cancer.
  • To determine if SIX4 impacts the efficacy of immune checkpoint blockade therapy.

Main Methods:

  • SIX4 gene knockout and ectopic expression in colon cancer cells.
  • Analysis of STING expression, activation, and downstream signaling.
  • In vivo studies in immune-competent mice using PD-1 antibodies.
  • Bioinformatic analysis of The Cancer Genome Atlas (TCGA) colon cancer dataset.

Main Results:

  • SIX4 knockout decreased STING mRNA and protein levels, while SIX4 overexpression increased them.
  • SIX4 depletion attenuated STING activation and downstream signaling.
  • Reduced SIX4 expression decreased CD8+ T cell infiltration and PD-1 antibody efficacy in vivo.
  • High SIX4 expression in colon tumors correlated with inflammatory response pathways and immune markers.

Conclusions:

  • SIX4 is a key regulator of STING expression in colon cancer cells.
  • SIX4 serves as a potential biomarker for predicting response to immune checkpoint blockade therapy.
  • Targeting SIX4 may enhance immunotherapy efficacy in colon cancer.