Neurotransmitter Receptor Internalization
Neurotransmitter Receptor Internalization - Related Videos
03:11
High-Resolution Imaging of Neurotransmitter Receptors at Retinal Synapses
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2025
Source: Zhang, J., et al. High-Resolution Quantitative Immunogold Analysis of Membrane Receptors at Retinal Ribbon Synapses. J. Vis. Exp. (2016)This video demonstrates an electron microscopy technique for visualizing neurotransmitter receptor localization in retinal synapses. The retinal sections contain retinal ganglion cells that exhibit membrane-bound neurotransmitter receptors and are labeled with cholera toxin subunit B (CTB). Upon labeling the markers with gold nanoparticle-conjugated...
01:56
Internal Receptors
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2021
Many cellular signals are hydrophilic and therefore cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind to internal, or intracellular, receptors that reside within the cell. Many mammalian steroid hormones use this mechanism of cell signaling, as does nitric oxide (NO) gas. Similar to membrane-bound receptors, binding of a ligand to a receptor located in the cytoplasm or nucleus of a cell...
01:56
Internal Receptors
0 Views •
2026
Many cellular signals are hydrophilic and therefore cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind to internal, or intracellular, receptors that reside within the cell. Many mammalian steroid hormones use this mechanism of cell signaling, as does nitric oxide (NO) gas. Similar to membrane-bound receptors, binding of a ligand to a receptor located in the cytoplasm or nucleus of a cell...
01:07
Types of Receptors: Internal Receptors
0 Views •
2023
Many cellular signals are hydrophilic and cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind intracellular receptors that reside within the cell cytoplasm or nucleus. Many mammalian steroid hormones and nitric oxide (NO) gas use this cell signaling mechanism. Similar to membrane-bound receptors, the binding of a ligand to the intracellular receptor of causes a conformational change in the...
04:13
Imaging Neurotransmitter Release Using Cell-Based Neurotransmitter Fluorescent Engineered Reporters
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2025
Source: Lacin, E., et al. Construction of Cell-based Neurotransmitter Fluorescent Engineered Reporters (CNiFERs) for Optical Detection of Neurotransmitters In Vivo. J. Vis. Exp. (2016)This video demonstrates a technique for imaging neurotransmitter release in vivo using cell-based neurotransmitter fluorescent engineered reporters (CNiFERs), specialized reporter cells pre-injected into the mouse cortex. Positioned under a two-photon microscope, the mouse allows visualization of...
FAQs
The initiating signal is receptor phosphorylation after neurotransmitter binding. This chemical modification can create or expose a docking site for adaptor proteins, which connect the receptor to clathrin-mediated internalization machinery. Clathrin helps organize membrane uptake, allowing the receptor to enter an intracellular endosome rather than remain at the synaptic surface. This links ligand recognition to trafficking.
Internalized receptors do not have a single inevitable fate. They can be recycled to the plasma membrane, retained in an intracellular store, or sent for degradation. Recycling can restore receptor availability, whereas storage can hold receptors away from signaling and degradation can reduce the pool capable of responding. These alternatives help produce distinct durations and magnitudes of neuronal adaptation.
The destination and timing of trafficking help distinguish transient desensitization from more sustained adaptation. Rapid removal from the surface can reduce responsiveness during continued neurotransmitter exposure, while recycling may support recovery. If receptors are instead stored or degraded, the effect can persist longer. Thus, receptor trafficking converts stimulation history into changes in neuronal responsiveness.
A mechanistic analysis can follow the pathway in sequence: determine whether neurotransmitter binding is followed by receptor phosphorylation, examine recruitment of adaptor proteins and clathrin, then track entry into intracellular endosomes. The final assessment asks whether receptors return to the plasma membrane, remain stored, or undergo degradation. This sequence connects molecular events with functional changes in signaling.
By changing how many receptors remain available at the neuronal surface, this process can alter the strength and duration of synaptic signaling. Surface replacement through recycling may help restore responsiveness, whereas storage or degradation can maintain a reduced response. These trafficking outcomes provide a mechanism through which synapses adjust their behavior over short or long periods.
The mechanism offers a trafficking-based explanation for how neurons respond differently to repeated or persistent stimulation. Changes in receptor removal, recycling, storage, or degradation can reshape neuronal responsiveness and synaptic signaling. Consequently, altered receptor trafficking is relevant to the neural adaptations associated with learning, addiction, pain, and neurological disease.