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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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Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
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Related Experiment Video

Updated: Jul 3, 2025

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Synaptic plasticity in human thalamocortical assembloids.

Mary H Patton1, Kristen T Thomas1, Ildar T Bayazitov1

  • 1Department of Developmental Neurobiology, St. Jude Children's Research Hospital; Memphis, TN 38105, USA.

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Summary

Human brain organoids mimic synaptic plasticity crucial for learning and memory. Thalamocortical assembloids enable studying human neural circuit function and disease.

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Area of Science:

  • Neuroscience
  • Stem Cell Biology
  • Human Organoid Models

Background:

  • Synaptic plasticity, including long-term potentiation (LTP) and long-term depression (LTD), is fundamental for learning and memory.
  • Studying human synaptic plasticity is challenging due to the lack of suitable experimental models.

Approach:

  • Developed human thalamocortical assembloids by fusing induced pluripotent stem cell-derived thalamic and cortical organoids.
  • Utilized single-nucleus RNA-sequencing to characterize cell types within the organoids.
  • Employed whole-cell patch-clamp electrophysiology and two-photon imaging to analyze synaptic function.

Key Points:

  • Thalamocortical assembloids exhibit reciprocal long-range axonal projections and functional synapses.
  • Both thalamocortical and corticothalamic synapses display short-term plasticity similar to animal models.
  • LTP and LTD were induced in human assembloids, but with distinct mechanisms compared to rodents.

Conclusions:

  • Thalamocortical assembloids serve as a novel model for investigating human synaptic plasticity.
  • This system offers new avenues for understanding the neural basis of learning, memory, and neurological disorders.