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Related Concept Videos

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Tumor Immunotherapy

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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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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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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
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Retinoic Acid Reprograms Mast Cells Toward a Proinflammatory State to Enhance Antitumor Immunity.

Lizao Zhang1,2, Siqi Ren1,2, Yuhui Li2,3

  • 1Department of Oral and Maxillofacial Surgery, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou, 510120, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 27, 2025
PubMed
Summary

Researchers identified a proinflammatory mast cell (PMC) population crucial for anti-tumor immunity. Retinoic acid signaling drives PMC polarization, enhancing T cell responses and improving clinical outcomes in various cancers.

Keywords:
Mast cellscancer immunotherapypan‐cancerretinoic acidsingle‐cell RNA sequencing

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Area of Science:

  • Immunology
  • Cancer Biology
  • Molecular Oncology

Background:

  • Mast cells have complex roles in the tumor microenvironment, but their diversity across cancers is unclear.
  • Understanding mast cell heterogeneity is key to developing novel cancer immunotherapies.

Purpose of the Study:

  • To map the transcriptional and spatial diversity of mast cells in human cancers.
  • To identify mast cell subsets and their functional roles in the tumor microenvironment.

Main Methods:

  • Integrated single-cell RNA sequencing and spatial transcriptomics across ten cancer types.
  • Performed mechanistic analyses to elucidate signaling pathways regulating mast cell function.

Main Results:

  • Identified a distinct proinflammatory mast cell (PMC) population with antigen-presenting and immune-activating properties.
  • Discovered that retinoic acid (RA) signaling, via RARα, drives PMC polarization, enhancing MHC-II and CXCL16 expression.
  • Demonstrated that higher PMC abundance correlates with better clinical outcomes across multiple cancer types.

Conclusions:

  • RA-RARα-CIITA signaling is pivotal in reprogramming mast cells towards an anti-tumor phenotype.
  • Pharmacologic induction of PMCs could be a promising strategy to boost antitumor immunity.