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Related Concept Videos

The Tumor Microenvironment02:17

The Tumor Microenvironment

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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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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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Autophagy01:27

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Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
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Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
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Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
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Quantitative Analysis of Autophagy using Advanced 3D Fluorescence Microscopy
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Exploiting Autophagy-Dependent Neoantigen Presentation in Tumor Microenvironment.

Evangelos Koustas1,2, Eleni-Myrto Trifylli2, Panagiotis Sarantis1

  • 1Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece.

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Autophagy, a cellular recycling process, is crucial for cancer immunotherapy by influencing neo-antigen presentation. Modulating autophagy may enhance patient responses to cancer treatments.

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Area of Science:

  • Cellular Biology
  • Immunology
  • Oncology

Background:

  • Autophagy is a fundamental cellular process for degradation and recycling, vital for homeostasis.
  • Dysregulated autophagy is linked to cancer development, tumor microenvironment interactions, and therapy resistance.
  • Autophagy significantly impacts immune cell function, including antigen-presenting cells, T-cells, and macrophages.

Purpose of the Study:

  • To review recent advances in autophagy-dependent neo-antigen presentation.
  • To explore the role of autophagy in cancer immunotherapy.
  • To discuss future directions for targeting autophagy in cancer treatment.

Main Methods:

  • Literature review of current research on autophagy and cancer immunotherapy.
  • Analysis of autophagy's role in neo-antigen presentation by dendritic cells (DCs).
  • Examination of autophagy's influence on immune cell activity and T-cell memory.

Main Results:

  • Autophagy is implicated in presenting tumor neo-antigens via MHC-I and MHC-II pathways in DCs.
  • Autophagy influences immune cell function, T-cell memory formation, and cross-presentation of neo-antigens.
  • Autophagy plays a critical role in the efficacy of current cancer immunotherapies.

Conclusions:

  • Autophagy-mediated neo-antigen presentation is a key mechanism in cancer immunotherapy.
  • Targeting autophagy offers a potential strategy to improve responses to immune checkpoint inhibitors.
  • Further research into autophagy's role can lead to novel therapeutic approaches for malignant tumors.