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Related Concept Videos

Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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Neuroplasticity01:01

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Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.
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Mechanisms of Membrane Domain Formation00:59

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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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Long-term Potentiation01:35

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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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Long-term Potentiation01:25

Long-term Potentiation

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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
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Long-term Depression01:05

Long-term Depression

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Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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Assembly and Characterization of Biomolecular Memristors Consisting of Ion Channel-doped Lipid Membranes
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Assembly and Characterization of Biomolecular Memristors Consisting of Ion Channel-doped Lipid Membranes

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Electromechanically induced membrane restructuring enables learning and memory.

Peter T Podar1,2,3, Dima Bolmatov1,4, Teshani Kumarage1,5,6,7

  • 1Shull Wollan Center, Oak Ridge National Laboratory and University of Tennessee, Oak Ridge, TN 37830.

Proceedings of the National Academy of Sciences of the United States of America
|November 4, 2025
PubMed
Summary
This summary is machine-generated.

Artificial neural networks mimic the brain's learning and memory. Researchers found that lipid bilayers with ion channels can reorganize when electrically stimulated, enhancing synaptic plasticity and mimicking brain functions.

Keywords:
droplet interface bilayerslong-term potentiationmembranesneuromorphic materialsshort-term synaptic plasticity

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Area of Science:

  • Neuroscience
  • Biophysics
  • Molecular Biology

Background:

  • Human neural networks utilize synaptic plasticity, including short-term plasticity (STP), long-term potentiation (LTP), and long-term depression (LTD), for learning and memory.
  • Understanding the molecular underpinnings of synaptic plasticity is crucial for advancing neuroscience and developing treatments for neurodegenerative diseases.

Purpose of the Study:

  • To investigate the structural reorganization of lipid bilayers with embedded gramicidin A ion channels.
  • To determine if neurologically inspired electrical stimulation can induce changes in membrane structure and function related to synaptic plasticity.

Main Methods:

  • Employing a neurologically inspired electrical stimulation protocol to interrogate lipid bilayers containing gramicidin A ion channels.
  • Analyzing voltage-induced electrocompression and its effects on membrane structure, stability, and ionic conductivity.

Main Results:

  • Lipid bilayers structurally reorganized into metastable states upon electrical stimulation.
  • These reorganized membranes exhibited enhanced short-term plasticity (STP) response.
  • Emergent long-term potentiation (LTP) or long-term depression (LTD) was observed, alongside increased ionic conductivity and persistent membrane ion conductance.

Conclusions:

  • Membrane restructuring induced by electrical stimulation can lead to nonequilibrium steady states with enhanced stability and conductivity.
  • These findings suggest a molecular mechanism by which membrane restructuring and emergent complexity may regulate synaptic plasticity.
  • This research offers insights into the molecular basis of learning and memory, with potential implications for neurodegenerative disease therapeutics.