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Related Concept Videos

Delivery Pathways to the Lysosome01:36

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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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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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How does a complex organism such as a human develop from a single cell? It all starts from a single fertilized egg which gives rise to a vast array of cell types, such as nerve cells, muscle cells, and epithelial cells that characterize the adult? Throughout development and adulthood, cellular differentiation leads cells to assume their final morphology and physiology. Differentiation is the process by which unspecialized cells become specialized to carry out distinct functions.
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Maturation of Endosomes01:28

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The early endosome containing internalized molecules matures through transformations in its location, morphology, intraluminal pH, and membrane protein composition. Together, these changes result in a more acidic late endosome that contains multiple intraluminal vesicles; therefore, the late endosome is also called a multivesicular body (MVB).
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Autophagy in Development and Differentiation.

Yang-Xi Hu1, Xiao-Shuai Han2, Qing Jing3

  • 1Department of Cardiology, Shanghai Changhai Hospital, 168 Changhai Road, Shanghai, 200433, China.

Advances in Experimental Medicine and Biology
|November 29, 2019
PubMed
Summary
This summary is machine-generated.

Autophagy, a cellular process, is vital for development and renewal in many organisms. Disruptions in autophagy can cause developmental abnormalities and impact stem cell functions.

Keywords:
AutophagyDevelopmentDifferentiationInvertebratesStem cells

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Molecular Biology

Background:

  • Autophagy is a fundamental cellular process involved in intracellular degradation and renewal.
  • It plays a critical role in responding to environmental and hormonal cues.
  • Maintaining cellular health, especially in terminally differentiated cells, relies on autophagy.

Purpose of the Study:

  • To explore the multifaceted roles of autophagy in development and differentiation across various species.
  • To investigate the consequences of impaired autophagy on cellular and organismal development.
  • To understand the association between autophagy and stem cell biology.

Main Methods:

  • Comparative analysis of autophagy function in model organisms (e.g., Drosophila, C. elegans).
  • Examination of developmental processes affected by autophagy.
  • Investigation of autophagy's role in mammalian embryonic development and stem cell maintenance.

Main Results:

  • Abnormal autophagy is linked to developmental defects in invertebrates, affecting tissues like salivary glands and midgut.
  • Autophagy is essential for mammalian embryonic development, adaptation to nutrient scarcity, and hematopoiesis.
  • Autophagy is critical for the self-renewal, differentiation, and senescence of various stem cell types, including hematopoietic, mesenchymal, and neural stem cells.

Conclusions:

  • Autophagy is a conserved and essential process for normal development and cellular homeostasis across diverse species.
  • Dysfunctional autophagy leads to significant developmental abnormalities and impacts stem cell behavior.
  • Targeting autophagy pathways may offer therapeutic potential for developmental disorders and regenerative medicine.