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Related Concept Videos

Endoplasmic Reticulum01:39

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The Endoplasmic Reticulum (ER) in eukaryotic cells is a substantial network of interconnected membranes with diverse functions, from calcium storage to biomolecule synthesis. A primary component of the endomembrane system, the ER manufactures phospholipids critical for membrane function throughout the cell. Additionally, the two distinct regions of the ER specialize in the manufacture of specific lipids and proteins.
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The endoplasmic reticulum or ER makes up for more than half of the membranes in a cell and accounts for 10% of total cell volume. It is also the primary protein and lipid synthesis factory for most cell organelles, such as the Golgi apparatus, lysosomes, secretory vesicles, and the plasma membrane. Despite being the most extensive and functionally complex subcellular organelle, ER was the last to be discovered. After years of deliberation, Keith Porter and George Palade in the year 1954,...
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Smooth endoplasmic reticulum or smooth ER is a sub-organelle with specialized functions in animal cells and plant cells. It is often associated with the tubule morphology of the endoplasmic reticulum.
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The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
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The two-state receptor model explains a drug's interaction with receptors, such as G protein-coupled receptors and ligand-gated ion channels, to induce or inhibit a biological response. When no natural ligands are present, a receptor exists in an equilibrium of inactive (Ri) and active (Ra) conformations. The inactive form does not produce a response, while the active form generates a basal effect known as constitutive activity.
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Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value. 
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3D Modeling of Dendritic Spines with Synaptic Plasticity
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Spine-to-Dendrite Calcium Modeling Discloses Relevance for Precise Positioning of Ryanodine Receptor-Containing Spine

Markus Breit1, Marcus Kessler1, Martin Stepniewski1

  • 1Goethe Center for Scientific Computing, Computational Neuroscience, Goethe University Frankfurt, Frankfurt, Germany.

Scientific Reports
|October 25, 2018
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Summary
This summary is machine-generated.

The position of endoplasmic reticulum (ER) within neuronal spines is crucial for calcium (Ca2+) signaling between spines and dendrites. Specific ER structures regulate signal strength and timing, impacting synaptic plasticity.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Computational Biology

Background:

  • The endoplasmic reticulum (ER) forms a dynamic network within neurons, extending into dendritic spines.
  • While ER calcium (Ca2+) release is linked to synaptic plasticity, the role of spine ER morphology is unclear.

Purpose of the Study:

  • To investigate the impact of spine ER morphology and positioning on Ca2+ signaling between dendritic spines and the dendritic shaft.
  • To understand how ER structure influences Ca2+ homeostasis and communication within neurons.

Main Methods:

  • Development of a novel 3D spine generator tool.
  • Implementation of 3D Ca2+ modeling, incorporating plasma membrane and ER Ca2+ exchange.
  • Simulation of Ca2+ signaling dynamics under various ER configurations.

Main Results:

  • Spine ER must adopt specific conformations to facilitate Ca2+ transfer from spine to dendrite.
  • The presence and position of RyanodR-expressing ER (RyR-carrying ER) significantly influence spine-to-dendrite Ca2+ signals.
  • RyR-carrying ER can generate delayed Ca2+ reverberation, contingent on its precise location.
  • ER structural reorganization during spine growth restores spine-to-dendrite Ca2+ communication while preserving Ca2+ homeostasis.

Conclusions:

  • Precise positioning of RyR-containing spine ER is critical for regulating the strength and timing of Ca2+ signaling.
  • Spine ER morphology plays a key role in tuning spine-to-dendrite Ca2+ communication and maintaining cellular homeostasis.