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Related Concept Videos

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.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
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Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
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Autophagic Cell Death01:18

Autophagic Cell Death

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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.
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and...
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Delivery Pathways to the Lysosome01:36

Delivery Pathways to the Lysosome

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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.
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
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Mitochondria01:37

Mitochondria

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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
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Visualizing Mitophagy with Fluorescent Dyes for Mitochondria and Lysosome
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Visualizing Mitophagy with Fluorescent Dyes for Mitochondria and Lysosome

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Autophagy in Mitochondrial Quality Control.

Rui Wang1, Guanghui Wang2

  • 1Laboratory of Molecular Neuropathology, Jiangsu Key Laboratory of Neuropsychiatric Diseases & Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, 215123, Jiangsu, China.

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

Autophagy is a cellular process crucial for removing damaged components and maintaining cell health. Selective autophagy ensures proper cell function and differentiation, with its dysfunction leading to diseases like anemia.

Keywords:
AutophagyFissionFusionMitochondriaMitophagyPINK1Parkin

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In Vitro and In Vivo Detection of Mitophagy in Human Cells, C. Elegans, and Mice

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Sensitive Measurement of Mitophagy by Flow Cytometry Using the pH-dependent Fluorescent Reporter mt-Keima
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Sensitive Measurement of Mitophagy by Flow Cytometry Using the pH-dependent Fluorescent Reporter mt-Keima

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Sensitive Measurement of Mitophagy by Flow Cytometry Using the pH-dependent Fluorescent Reporter mt-Keima
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Area of Science:

  • Cell Biology
  • Molecular Biology

Background:

  • Autophagy, encompassing macroautophagy and microautophagy, is vital for cellular renewal, energy production, metabolism, and organelle clearance.
  • While initially considered nonselective, recent research highlights the importance of selective autophagy in degrading specific cellular components like damaged organelles.

Purpose of the Study:

  • To elucidate the role of selective autophagy in cellular quality control and homeostasis.
  • To investigate the specific mechanisms of organelle clearance, including mitophagy, reticulophagy, and pexophagy.
  • To understand the implications of autophagy dysfunction in cellular injury and disease, particularly in red blood cell maturation.

Main Methods:

  • Literature review and synthesis of current research on autophagy mechanisms.
  • Analysis of selective degradation pathways for mitochondria, endoplasmic reticulum, and peroxisomes.
  • Examination of autophagy's role in red blood cell differentiation and disease pathogenesis.

Main Results:

  • Selective autophagy, rather than nonselective macroautophagy, is responsible for the targeted clearance of damaged organelles.
  • Specific selective autophagy pathways like mitophagy, reticulophagy, and pexophagy facilitate the removal of distinct organelles.
  • Autophagy is essential for the maturation of red blood cells, involving the selective removal of organelles like mitochondria.

Conclusions:

  • Autophagy is a critical cellular quality control mechanism that maintains homeostasis by selectively removing dysfunctional components.
  • Dysfunctional autophagy impairs organelle clearance, leading to cellular injury and contributing to diseases such as anemia due to defective red blood cell differentiation.