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Related Concept Videos

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.
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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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Cells pull particles inward and engulf them in spherical vesicles in an energy-requiring process called endocytosis. Phagocytosis (“cellular eating”) is one of three major types of endocytosis. Cells use phagocytosis to take in large objects—such as other cells (or their debris), bacteria, and even viruses.
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Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
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Lysosomes are membrane-enclosed spherical sacs derived from the Golgi apparatus. The most important function of the lysosome is degrading macromolecules and biological polymers that are released during membrane trafficking events such as the secretory, endocytic, autophagic, and phagocytic pathways. The degradation is carried out by several hydrolytic enzymes active in an acidic environment of the lysosomal lumen. These acid hydrolases are involved in cellular processes such as cell signaling,...
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Lipid metabolism is a crucial process in the human body that involves the synthesis and degradation of lipids. This process is essential for energy production, cell membrane formation, and hormone production, among other functions.
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Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy
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Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy

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Lipophagy at a glance.

Micah B Schott1, Cody N Rozeveld1, Shaun G Weller2

  • 1Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, 985870 Nebraska Medical Center, Omaha, NE 68198, USA.

Journal of Cell Science
|March 9, 2022
PubMed
Summary
This summary is machine-generated.

Lipophagy, the breakdown of cellular fat, provides energy. Understanding its molecular mechanisms and role in diseases like metabolic disorders is crucial for developing new therapies.

Keywords:
AutophagyLipid dropletLipolysisLipophagyMetabolism

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Area of Science:

  • Cell Biology
  • Metabolism
  • Autophagy

Background:

  • Lipophagy is a key cellular process for energy production through neutral lipid catabolism.
  • Recent research is elucidating the molecular machinery and regulatory pathways of lipophagy.
  • Lipid droplets (LDs) are central organelles involved in neutral lipid storage and mobilization.

Purpose of the Study:

  • To provide an overview of the molecular components of the lipid droplet proteome.
  • To highlight the key proteins involved in lipolysis and lipophagy.
  • To discuss the current understanding of macro- and micro-lipophagy and their disease implications.

Main Methods:

  • Review of existing literature on lipophagy.
  • Analysis of protein components of lipid droplets.
  • Comparative study across different model systems (yeast, mammalian).

Main Results:

  • Identification of structural and enzymatic proteins within the LD proteome.
  • Elucidation of key players in the catabolic breakdown of LDs.
  • Characterization of macro- and micro-lipophagy pathways.

Conclusions:

  • Lipophagy is essential for cellular energy homeostasis.
  • Dysregulation of lipophagy is linked to various disease states.
  • Further research into lipophagy holds therapeutic potential for metabolic and other diseases.