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Related Experiment Video

Updated: Aug 18, 2025

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Dendritic cells direct circadian anti-tumour immune responses.

Chen Wang1, Coline Barnoud1, Mara Cenerenti1,2

  • 1Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland.

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|December 5, 2022
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Tumour growth is influenced by the time of day it begins. Circadian rhythms in immune cells like dendritic cells and CD8+ T cells control melanoma volume, impacting cancer immunotherapy effectiveness.

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Area of Science:

  • Immunology
  • Chronobiology
  • Cancer Research

Background:

  • Cancer immunosurveillance is a natural defence against tumour development.
  • The daily fluctuation in the effectiveness of cancer immunosurveillance is not well understood.

Purpose of the Study:

  • To investigate whether the time of day influences cancer immunosurveillance effectiveness.
  • To explore the role of circadian rhythms in immune cells controlling tumour growth.

Main Methods:

  • Utilized mouse cancer models, including immunodeficient mice.
  • Assessed the impact of tumour engraftment timing on tumour size.
  • Investigated the function of dendritic cells (DCs) and CD8+ T cells in circadian anti-tumour activity.

Main Results:

  • The time of tumour engraftment significantly affects subsequent tumour size.
  • Dendritic cells and CD8+ T cells exhibit circadian functions that suppress melanoma growth.
  • Rhythmic DC trafficking and CD80 expression regulate CD8+ T cell responses.

Conclusions:

  • Circadian rhythms in immune components are crucial for controlling tumour size.
  • Synchronizing cancer immunotherapy with DC circadian functions enhances treatment efficacy.
  • These findings suggest potential therapeutic applications of circadian-based cancer treatments in humans.