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Human Foetal Neuroblasts Exhibit BK Channel-Dependent Membrane Voltage Oscillations upon Depolarization
Elisabetta Coppi1, Federica Cherchi1,2, Martina Venturini1,3
1Department of Neuroscience, Psychology, Division of Pharmacology and Toxicology, Drug Research and Child Health (NEUROFARBA), University of Florence, Florence, Italy.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|July 24, 2026
Summary
Immature human neuroblasts exhibit unique, high-frequency voltage oscillations dependent on big conductance calcium-activated potassium (BK) channels. This discovery offers insights into early neuronal development and potential links to neurodevelopmental disorders.
Area of Science:
- Neuroscience
- Developmental Biology
- Electrophysiology
Background:
- Immature neuroblasts display distinct electrical properties before achieving mature neuronal excitability.
- Human fetal nucleus basalis of Meynert neuroblasts (hfNBMNs) possess acetylcholine machinery and ion currents.
Purpose of the Study:
- To investigate the electrophysiological properties of immature hfNBMNs.
- To characterize unexpected electrical activities observed in these neuroblasts.
Main Methods:
- Primary neuroblast cultures from human fetal brain tissue.
- Electrophysiological recordings to detect membrane voltage oscillations.
- Pharmacological manipulations using channel blockers and intracellular agents.
Main Results:
- Observed high-frequency (avg. 70 Hz), periodic-like voltage oscillations upon depolarization.
- Activity was sensitive to intracellular BAPTA and thapsigargin.
- Extracellular application of TEA, Ba2+, and Iberiotoxin indicated involvement of BK channels.
Conclusions:
- hfNBMNs exhibit recurrent, BK channel-dependent, high-frequency voltage waves.
- These waves may represent an immature excitability pattern crucial for neuronal maturation and network integration.
- Dysregulation of this activity could be implicated in neurodevelopmental disorders.
