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Related Concept Videos

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Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or  immature dendritic cells. Non-professional phagocytes such as  epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes. 
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Apoptosis is a combination of two Greek words, 'apo' and 'ptosis,' meaning separation and falling off, respectively. Hippocrates used this word to describe gangrene, which was caused due to bandaging of fractured bones. Apoptosis was distinguished from necrosis in 1970 when John Kerr reported observations of morphological changes occurring during apoptosis. During one experiment, he observed that the disruption of blood supply to the liver tissue resulted in a size...
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Cell death is an essential process where the body gets rid of old or damaged cells. Cell proliferation and death need to be balanced, as an imbalance between the two may lead to cancer or autoimmune diseases.
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Different tissue phagocytes sample apoptotic cells to direct distinct homeostasis programs.

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Professional phagocytes, including dendritic cells and macrophages, clear apoptotic cells to maintain immune tolerance. This study reveals specialized roles for these cells in the intestine, impacting inflammation and disease.

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Area of Science:

  • Immunology
  • Cell Biology
  • Gastroenterology

Background:

  • Phagocytes like dendritic cells and macrophages clear apoptotic cells, crucial for immune homeostasis and preventing inflammation.
  • Studying in situ apoptotic cell clearance by diverse tissue-resident phagocytes is challenging.
  • The specific functions of phagocytes in response to homeostatic apoptosis remain largely unclear.

Purpose of the Study:

  • To investigate the roles of specific phagocyte subsets in clearing apoptotic intestinal epithelial cells (IECs) in situ.
  • To characterize the molecular responses of phagocytes upon sampling apoptotic IECs.
  • To understand how apoptotic IEC clearance influences immune responses and mucosal homeostasis.

Main Methods:

  • In situ sampling of apoptotic intestinal epithelial cells (IECs) in mouse models.
  • Transcriptomic analysis of phagocyte subsets before and after apoptotic IEC sampling.
  • Identification of unique gene expression signatures in different phagocyte populations.
  • Tracking of apoptotic IECs to mesenteric lymph nodes.

Main Results:

  • A specific subset of dendritic cells and two macrophage subsets sample apoptotic IECs in the small intestinal lamina propria.
  • Phagocytes exhibit unique transcriptional signatures, including macrophage-specific lipid metabolism and dendritic cell-specific regulatory T-cell activation programs.
  • Apoptotic IECs are transported to lymph nodes by dendritic cells, driving tolerogenic T-cell differentiation.
  • Differentially expressed genes in phagocytes overlap with inflammatory bowel disease susceptibility genes.

Conclusions:

  • Apoptotic IEC sampling by distinct phagocyte subsets is a specialized process maintaining mucosal homeostasis.
  • Phagocyte responses to apoptotic IECs involve unique molecular pathways that suppress inflammation.
  • This mechanism is critical for inducing immune tolerance and preventing chronic inflammatory diseases like inflammatory bowel disease.