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Related Concept Videos

Lysosomes01:31

Lysosomes

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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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Lysosomal Hydrolases01:22

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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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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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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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The liver, an essential organ in the human body, performs over 200 vital functions that can be broadly categorized into metabolic, hematological, endocrine regulation, and bile production.
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Updated: Dec 22, 2025

Dual-color Correlative Light and Electron Microscopy for the Visualization of Interactions between Mitochondria and Lysosomes
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Dual-color Correlative Light and Electron Microscopy for the Visualization of Interactions between Mitochondria and Lysosomes

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SnapShot: Lysosomal Functions.

Lya K K Holland1, Inger Ødum Nielsen1, Kenji Maeda1

  • 1Cell Death and Metabolism Unit, Center for Autophagy, Recycling and Disease, Danish Cancer Society Research Center, DK-2100 Copenhagen, Denmark.

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Summary

Lysosomes are more than just recycling centers; they are crucial metabolic signaling hubs. These organelles regulate cellular metabolism and influence processes like cell death and division through released enzymes and ions.

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Dual-color Correlative Light and Electron Microscopy for the Visualization of Interactions between Mitochondria and Lysosomes
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Area of Science:

  • Cell Biology
  • Metabolism
  • Molecular Biology

Background:

  • Lysosomes traditionally known for their role in cellular waste recycling.
  • Emerging evidence suggests lysosomes possess signaling functions beyond degradation.
  • Nutrient and growth factor availability impact cellular metabolic states.

Purpose of the Study:

  • To elucidate the role of lysosomes as metabolic signaling hubs.
  • To investigate how lysosomes regulate cellular metabolism.
  • To explore the function of lysosomal hydrolases and ions in cellular processes.

Main Methods:

  • Analysis of lysosomal surface proteins involved in metabolic regulation.
  • Investigating the release and function of lysosomal hydrolases and ions.
  • Assessing the impact of lysosomal activity on cellular metabolism, death, and division.

Main Results:

  • Lysosomes regulate metabolic kinases and transcription factors on their surface.
  • Lysosomal hydrolases and ions released into the cytosol act as signaling molecules.
  • These signaling molecules influence critical cellular processes including cell death and division.

Conclusions:

  • Lysosomes function as central metabolic signaling hubs, integrating nutrient and growth factor signals.
  • Lysosomal hydrolases and ions play significant regulatory roles in cellular physiology.
  • Understanding lysosome function is key to comprehending cellular metabolic control and signaling pathways.