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Single-Cell Transcriptomics Reveals Immune Modulation by Telmisartan in Colorectal Cancer.

Jinxin Li1,2, Decao Yang1,2, Xiaoyue Wang1,2

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Summary
This summary is machine-generated.

Telmisartan, an angiotensin II receptor blocker, suppresses colorectal tumor growth by reducing pro-tumoral macrophages and boosting cytotoxic T cell responses. This drug repurposing offers potential for novel cancer immunotherapy strategies.

Keywords:
T cellcolorectal cancermacrophagetelmisartantumor microenvironment

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Area of Science:

  • Immunology
  • Oncology
  • Pharmacology

Background:

  • Telmisartan, an angiotensin II type 1 receptor blocker, possesses anti-inflammatory and antihypertensive properties.
  • Previous studies suggest telmisartan inhibits tumor cell proliferation, but its effect on the tumor immune microenvironment is unclear.

Purpose of the Study:

  • To investigate the immunomodulatory effects of telmisartan on the tumor immune microenvironment.
  • To elucidate the mechanisms by which telmisartan influences immune cell populations and functions within colorectal tumors.

Main Methods:

  • Utilized a syngeneic MC38 colorectal cancer model in C57BL/6 mice.
  • Administered telmisartan daily via intragastric gavage.
  • Performed single-cell RNA sequencing on tumor-infiltrating CD45+ immune cells.

Main Results:

  • Telmisartan significantly suppressed tumor growth and reduced tumor weight.
  • Single-cell analysis revealed telmisartan downregulated pro-tumoral and M2-associated macrophage programs (e.g., decreased Mrc1, Spp1 expression).
  • Telmisartan increased CD8+ T cells, decreased regulatory T cells, and enhanced MHC class I antigen presentation.

Conclusions:

  • Telmisartan reshapes the colorectal tumor immune microenvironment by inhibiting pro-tumoral macrophages and enhancing cytotoxic T cell responses.
  • This study provides a single-cell perspective on angiotensin receptor blockade's impact on tumor immunity.
  • Repurposing telmisartan presents a potential strategy for novel cancer immunotherapies.