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Autophagy01:27

Autophagy

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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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Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
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Cellular Injury V: Apoptosis and Autophagy01:22

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Cells respond to damage and stress through highly coordinated processes that decide whether they survive or undergo controlled self-destruction. Two major pathways involved in this regulation are apoptosis, a type of programmed cell death, and autophagy, a survival mechanism that helps cells adapt to adverse conditions.ApoptosisApoptosis removes aged or injured cells to maintain tissue balance. During this process, the cell shrinks, chromatin condenses and fragments, and membrane-bound...
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Autophagic Cell Death01:18

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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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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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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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In Situ Immunofluorescent Staining of Autophagy in Muscle Stem Cells
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Autophagy and the immune function in aging.

Ana Maria Cuervo1, Fernando Macian2

  • 1Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY, 10461, USA; Institute for Aging Studies, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY, 10461, USA.

Current Opinion in Immunology
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PubMed
Summary
This summary is machine-generated.

Autophagy, a cellular recycling process, plays crucial roles in both innate and acquired immunity. Its dysfunction with age impacts immune cell functions, highlighting new connections between autophagy and immunity.

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Area of Science:

  • Cellular Biology
  • Immunology
  • Aging Research

Background:

  • Autophagy is a fundamental cellular process for degrading and recycling cellular components via lysosomes.
  • Recent research has uncovered novel types of autophagy and expanded understanding of its functions.
  • The immune system increasingly utilizes insights from autophagy research, particularly concerning host defense and immune cell specialization.

Purpose of the Study:

  • To explore emerging roles of autophagy in innate and acquired immunity.
  • To detail new functions of autophagic pathways within immune cells.
  • To examine the consequences of impaired autophagy on immune function during aging.

Main Methods:

  • Review of recent scientific literature on autophagy and immunology.
  • Analysis of studies investigating autophagic pathways in immune cells.
  • Examination of age-related changes in autophagy and immune responses.

Main Results:

  • Autophagy is implicated in various aspects of host defense against pathogens.
  • Distinct autophagic pathways exhibit unique functions within different immune cell types.
  • Malfunctioning of autophagy with advancing age is linked to compromised immune system functions.

Conclusions:

  • Autophagy's role in immunity is more complex and multifaceted than previously understood.
  • New autophagic functions are continually being discovered, strengthening the link between cellular recycling and immune responses.
  • Age-related decline in autophagy contributes to immune senescence and dysfunction.