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Updated: Jan 21, 2026

Real Time Detection of In Vitro Tumor Cell Apoptosis Induced by CD8+ T Cells to Study Immune Suppressive Functions of Tumor-infiltrating Myeloid Cells
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Real Time Detection of In Vitro Tumor Cell Apoptosis Induced by CD8+ T Cells to Study Immune Suppressive Functions of Tumor-infiltrating Myeloid Cells

Published on: January 29, 2019

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Cinnamaldehyde causes apoptosis of myeloid-derived suppressor cells through the activation of TLR4

Wanzhuo He1, Wensheng Zhang2, Qilin Zheng2

  • 1College of Life Sciences, Peking University, Beijing 100871, P.R. China.

Oncology Letters
|August 13, 2019
PubMed

Insights

Cinnamaldehyde (CA), derived from cinnamon, effectively reduces myeloid-derived suppressor cells (MDSCs) and enhances antitumor immunity. This natural compound shows promise for novel cancer therapies by targeting immune-suppressing cells.

Area of Science:

  • Immunology
  • Pharmacology
  • Oncology

Background:

  • Malignant tumors pose significant global health risks, with current treatments limited by severe side effects and toxicity.
  • Myeloid-derived suppressor cells (MDSCs) critically inhibit effective antitumor immune responses, representing a key therapeutic target in cancer.
  • Cinnamaldehyde (CA), a compound from cinnamon, is explored for its potential immunomodulatory and anticancer properties.

Purpose of the Study:

  • To investigate the anti-MDSC activity of cinnamaldehyde (CA).
  • To evaluate the potential of CA as a therapeutic agent for cancer by assessing its impact on immune suppression mediated by MDSCs.

Main Methods:

  • MDSCs were isolated from the spleens of mice with colon cancer to establish an in vitro model.
  • The effects of CA treatment on MDSC proliferation and apoptosis were assessed.
  • Key apoptosis-related proteins (Bax, Bcl-2, caspase-9) were analyzed to elucidate the mechanism of action.

Main Results:

  • CA treatment significantly reduced MDSC proliferation and induced apoptotic cell death in vitro.
  • CA enhanced the expression of pro-apoptotic proteins Bax and caspase-9 while downregulating the anti-apoptotic protein Bcl-2.
  • These findings suggest CA induces apoptosis in MDSCs via the intrinsic mitochondrial pathway.

Conclusions:

  • Cinnamaldehyde (CA) exhibits significant anti-MDSC activity.
  • CA treatment attenuates the immunosuppressive function of MDSCs, thereby potentially enhancing the antitumor immune response.
  • CA demonstrates potential as a novel therapeutic agent for cancer treatment.
Keywords:
antitumorapoptosiscinnamaldehydemyeloid-derived suppressor cellstoll-like receptor 4

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