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The Tumor Microenvironment02:17

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Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
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Related Experiment Video

Updated: Jun 27, 2025

Studying the Effects of Tumor-Secreted Paracrine Ligands on Macrophage Activation using Co-Culture with Permeable Membrane Supports
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Cholesterol and Immune Microenvironment: Path Towards Tumorigenesis.

Eslam E Saad1, Rachel Michel2, Mostafa A Borahay3

  • 1Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.

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High cholesterol levels suppress the immune system, worsening cancer prognosis. Targeting cholesterol synthesis offers a novel strategy for cancer treatment, particularly for obesity-related cancers.

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Area of Science:

  • Oncology
  • Immunology
  • Metabolic Syndrome

Background:

  • Obesity is a significant risk factor for various cancers.
  • Hypercholesterolemia, a common comorbidity of obesity, is increasingly linked to cancer development.
  • Statins, used to treat hypercholesterolemia, show potential in improving cancer prognosis.

Purpose of the Study:

  • To investigate the immunomodulatory role of cholesterol in cancer.
  • To explore how cholesterol affects the tumor immune microenvironment and immune cells.
  • To understand the oncogenic driving activity of cholesterol.

Main Methods:

  • Literature review focusing on cholesterol's impact on tumor immunity.
  • Analysis of cholesterol's modulation of immune cells (dendritic cells, T cells, Tregs, neutrophils).
  • Examination of cholesterol's effect on immune mediators (PD-1, CTLA-4, TGF-β, IL-12, IL-23, FOXP3).

Main Results:

  • Cholesterol plays an immunosuppressive role, correlating with poorer cancer outcomes.
  • Cholesterol influences the expression of key immune mediators within the tumor microenvironment.
  • Evidence suggests cholesterol aids tumor progression by altering immunological architecture.

Conclusions:

  • Cholesterol's immunomodulatory effects contribute to its oncogenic potential.
  • Targeting cholesterol synthesis may represent a promising therapeutic strategy for obesity-related cancers.
  • Further research is warranted on cholesterol's role in specific cancers like breast, colorectal, and pancreatic cancer.