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What are Cells?01:07

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Cells are the smallest and basic units of life, whether it is a single cell that forms the entire organism, e.g., in a bacterium or trillions of them, e.g., in humans. No matter what organism a cell is a part of, they share specific characteristics.
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A living cell has a plasma membrane, a bilayer of lipids that separates the aqueous solution inside the cell called the cytoplasm from the outside environment.
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Cells are the smallest and basic units of life, whether it is a single cell that forms the entire organism, e.g., in a bacterium, or trillions of them, e.g., in humans. No matter what organism a cell is a part of, they share specific characteristics.
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Concentration Cells02:41

Concentration Cells

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A concentration cell is a type of a  voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species.
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Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate to respond to the environment.
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Chemistry of the Cell02:58

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The cell is chemically composed of water, organic molecules and inorganic ions.
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Hair Cells01:22

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Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
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Updated: Jan 25, 2026

Generation of Alpha-Synuclein Preformed Fibrils from Monomers and Use In Vivo
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Generation of Alpha-Synuclein Preformed Fibrils from Monomers and Use In Vivo

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How is alpha-synuclein cleared from the cell?

Leonidas Stefanis1,2, Evangelia Emmanouilidou1, Marina Pantazopoulou1

  • 1Biomedical Research Foundation of the Academy of Athens, Athens, Greece.

Journal of Neurochemistry
|May 10, 2019
PubMed
Summary
This summary is machine-generated.

Alpha-synuclein clearance pathways, including proteasomes, lysosomes, and exosomes, are crucial for preventing Parkinson's disease. Dysfunctional clearance mechanisms contribute to disease progression, offering therapeutic targets.

Keywords:
alpha-synucleindegradationexosomeslysosomesproteasomeubiquitin

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Bioluminescence Imaging of Neuroinflammation in Transgenic Mice After Peripheral Inoculation of Alpha-Synuclein Fibrils
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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Alpha-synuclein aggregation is central to Parkinson's disease (PD) and synucleinopathies.
  • Protein degradation and secretion pathways regulate alpha-synuclein levels and spread.
  • Understanding alpha-synuclein clearance is vital for PD pathogenesis research.

Purpose of the Study:

  • To review intracellular and extracellular pathways for alpha-synuclein removal.
  • To explore the roles of proteasomes, lysosomes, and exosomes in alpha-synuclein homeostasis.
  • To discuss the implications of clearance pathway dysfunction in Parkinson's disease.

Main Methods:

  • Literature review of protein degradation and secretion mechanisms.
  • Analysis of alpha-synuclein trafficking and clearance pathways.
  • Synthesis of current knowledge on alpha-synuclein homeostasis.

Main Results:

  • Proteasomes and lysosomes degrade intracellular alpha-synuclein, influenced by post-translational modifications.
  • Extracellular alpha-synuclein is cleared by proteases or cell uptake (microglia, astrocytes).
  • Exosomes facilitate extracellular release of alpha-synuclein, potentially aiding cell-to-cell transfer.

Conclusions:

  • Impaired alpha-synuclein clearance by these pathways may initiate or advance Parkinson's disease.
  • Targeting these clearance mechanisms presents a promising therapeutic strategy for synucleinopathies.