Synaptic Function Assessment
Synaptic Function Assessment - Related Videos
05:08
Drosophila Neuromuscular Junction (NMJ) Quantification: A Method to Assess Synaptic Morphology and Function
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2023
The Drosophila neuromuscular junction (NMJ) is used as a model to study the morphology and function of synapses. This video describes important features that researchers quantify to characterize the NMJ. The example protocol demonstrates a software able to perform the quantification automatically.
08:46
Studying Synaptic Vesicle Pools using Photoconversion of Styryl Dyes
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Cited by 18 •
2010
FM dyes have been of invaluable help in the understanding of synaptic dynamics. FMs are normally followed under the fluorescent microscope during different stimulation conditions. However, photoconversion of FM dyes combined with electron microscopy allows the visualization of distinct synaptic vesicle pools, among other ultrastructure components, in synaptic boutons.
10:08
Microtransplantation of Synaptic Membranes to Reactivate Human Synaptic Receptors for Functional Studies
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Cited by 2 •
2022
The protocol demonstrates that by performing microtransplantation of synaptic membranes into Xenopus laevis oocytes, it is possible to record consistent and reliable responses of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid and γ-aminobutyric acid receptors.
11:20
Osmotic Avoidance in Caenorhabditis elegans: Synaptic Function of Two Genes, Orthologues of Human NRXN1 and NLGN1, as Candidates for Autism
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Cited by 27 •
2009
Neurexins and neuroligins are membrane-neuron adhesion proteins which perform essential roles in synaptic differentiation and transmission. Neuroligin deficient mutants of C. elegans are defective in detecting osmotic strength, but when they also contain a mutation in the gene coding neurexin, they recover the wild type phenotype.
05:41
Non-invasive Assessment of Microvascular and Endothelial Function
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Cited by 12 •
2013
Capillaroscopy is a non-invasive, relatively inexpensive methodology for directly visualizing the microcirculation. The forearm blood flow technique provides accepted non-invasive measures of endothelial function.
FAQs
Comparison of synaptic and intrinsic neuronal measures is central to interpretation. A change in neurotransmitter release or receptor-mediated current points toward altered communication at the junction, whereas a change in neuronal excitability reflects how readily a cell responds to input. Measuring both helps determine whether an observed circuit abnormality arises from synaptic transmission, membrane responsiveness, or their interaction.
Measurements of neurotransmitter release address the presynaptic contribution to signaling, while receptor-mediated currents report the postsynaptic response to that signal. Examining these components separately can help localize a functional change to the sending side, receiving side, or communication between them. This distinction is useful when comparing normal circuits with drug- or gene-perturbed preparations.
Calcium imaging offers a complementary readout to direct electrophysiological measurements. It can be used alongside assays of synaptic activity to examine how signaling-related changes appear across neurons or circuits, while electrophysiology more directly measures currents or membrane-potential changes. Combining approaches can strengthen interpretation by linking cellular activity patterns with specific synaptic functional measurements.
Assessing synaptic plasticity asks whether communication changes over time or after relevant stimulation, rather than only measuring a single response. This dimension is important for connecting cellular synaptic behavior with learning and memory, where circuits must modify how information is transmitted. It also helps identify functional changes that may not be evident from baseline release, currents, or membrane-potential measurements alone.
Selection usually follows the biological question: electrophysiology is appropriate when the goal is to quantify synaptic currents or membrane-potential changes, whereas calcium imaging can provide a complementary activity readout. Related assays may be added when the study focuses on release, receptor responses, or plasticity. The chosen combination should match whether the outcome is cellular, synaptic, or circuit-level.
It is used to investigate how neural circuits support learning and memory, how synaptic communication changes during neurodevelopment, and how neurological disease disrupts brain function. The same measurements can test the effects of drugs or genetic perturbations by revealing changes in release, receptor-mediated responses, excitability, or plasticity. These outcomes support more precise models of normal and dysfunctional neural circuits.