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Related Concept Videos

Cholesterol: Significance and Regulation01:29

Cholesterol: Significance and Regulation

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Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
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Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
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Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
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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

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LDL Cholesterol Uptake Assay Using Live Cell Imaging Analysis with Cell Health Monitoring
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Tumor Cholesterol Up, T Cells Down.

Elodie Picarda1, Xiaoxin Ren1, Xingxing Zang2

  • 1Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, NY 10461, USA.

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|July 4, 2019
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Summary

Tumor cholesterol impairs T cell function by affecting endoplasmic reticulum stress pathways. This research uncovers a new cause of T cell exhaustion in cancer.

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Area of Science:

  • Immunology
  • Cancer Biology
  • Cellular Metabolism

Background:

  • Tumor microenvironments can suppress immune responses, leading to T cell dysfunction.
  • The precise mechanisms driving T cell exhaustion in tumors are not fully understood.

Purpose of the Study:

  • To investigate the role of tumor cholesterol in T cell dysfunction.
  • To identify molecular pathways linking tumor cholesterol to T cell exhaustion.

Main Methods:

  • Analysis of T cell function within the tumor microenvironment.
  • Investigation of endoplasmic reticulum stress markers in T cells.
  • Assessment of cholesterol levels in tumor tissues.

Main Results:

  • Elevated tumor cholesterol was found to be detrimental to T cell viability and function.
  • Cholesterol was shown to modulate endoplasmic reticulum stress pathways in T cells.
  • These molecular changes correlated with T cell exhaustion.

Conclusions:

  • Tumor-derived cholesterol actively contributes to T cell exhaustion.
  • Modulating cholesterol metabolism or endoplasmic reticulum stress may offer therapeutic strategies against cancer.