Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Localizing quantal currents along frog neuromuscular junctions

W Van der Kloot1, L A Naves

  • 1Department of Physiology and Biophysics, State University of New York, Stony Brook 11794-8661, USA. wvanderkloot@ccmail.sunysb.edu

The Journal of Physiology
|November 15, 1996
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Homeostatic plasticity induced by increased acetylcholine release at the mouse neuromuscular junction.

Neurobiology of aging·2021
Same author

Cm38: a new antimicrobial peptide active against Klebsiella pneumoniae is homologous to Cn11.

Protein and peptide letters·2015
Same author

Frontoxins, three-finger toxins from Micrurus frontalis venom, decrease miniature endplate potential amplitude at frog neuromuscular junction.

Toxicon : official journal of the International Society on Toxinology·2010
Same author

Craniofacial abnormalities, obesity, and hormonal alterations have similar effects in magnitude on the development of nocturnal hypoxemia in patients with acromegaly.

Journal of endocrinological investigation·2009
Same author

The role of non-invasive dynamic tests in the diagnosis of Cushing's syndrome.

Journal of endocrinological investigation·2009
Same author

Diagnosis and management of hyperprolactinemia: results of a Brazilian multicenter study with 1234 patients.

Journal of endocrinological investigation·2008
Same journal

Improved subjective sleep quality in older adults by enhancing the GABAergic system in the sensorimotor cortex.

The Journal of physiology·2026
Same journal

Fasting-induced glucose intolerance is not impacted by the addition of daily exercise: A randomized crossover study.

The Journal of physiology·2026
Same journal

Diving exposure and pulmonary stress.

The Journal of physiology·2026
Same journal

Systems modelling of mitochondrial dynamics in different exercise regimes.

The Journal of physiology·2026
Same journal

Central leptin resistance precedes obesity and drives early endocrine dysfunction.

The Journal of physiology·2026
Same journal

Decoding the molecular memory of obesity using machine learning and microRNA dynamics.

The Journal of physiology·2026
See all related articles

Researchers pinpointed the origins of nerve signal currents using advanced recording techniques. Miniature endplate potentials (MEPPs) and quantal release sites were mapped, revealing insights into neuromuscular junction function.

Area of Science:

  • Neuroscience
  • Cellular Biology
  • Biophysics

Background:

  • The precise spatial localization of quantal current origins at the neuromuscular junction is crucial for understanding synaptic transmission.
  • Previous methods have yielded varying results regarding the distribution and characteristics of miniature endplate potentials (MEPPs).

Purpose of the Study:

  • To spatially map the origins of quantal currents at the neuromuscular junction.
  • To investigate the distribution and characteristics of spontaneous MEPPs and evoked endplate potentials (EPPs).
  • To determine the effect of nicotinic agonists on quantal release and nerve conduction.

Main Methods:

  • Simultaneous intracellular recordings with two electrodes.
  • Application of one-dimensional cable equations to predict exponential fall-off of voltage changes with distance.

Related Experiment Videos

  • Extracellular and intracellular electrode recordings.

    • Main Results:

    • MEPPs were predominantly found near the center of the endplate, with no significant reduction in amplitude at the margins.
    • Spontaneous MEPPs and uniquantal EPPs originated from the same endplate region with similar regional probabilities.
    • Nicotinic agonists reduced evoked quantal output but did not alter the generation length of uniquantal EPPs, suggesting they do not block nerve conduction.
    • Extracellular electrodes may possess a longer recording range than conventionally assumed, with synchronous MEPPs detected up to 0.8 mm away.

    Conclusions:

    • Quantal currents originate from a defined region of the endplate, with MEPPs and EPPs sharing common release sites.
    • Nicotinic agonists modulate quantal output without affecting nerve conduction in the terminals.
    • Extracellular recordings offer a potentially broader spatial resolution for detecting synaptic events.