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Updated: Jun 11, 2026

Localization of the Locus Coeruleus in the Mouse Brain
07:44

Localization of the Locus Coeruleus in the Mouse Brain

Published on: March 7, 2019

Pacemaker currents in mouse locus coeruleus neurons.

R B de Oliveira1, M C H Howlett, F S Gravina

  • 1School of Biomedical Sciences and Pharmacy, University of Newcastle, University Drive, New South Wales 2308, Australia.

Neuroscience
|July 13, 2010
PubMed
Summary
This summary is machine-generated.

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Mouse locus coeruleus (LC) neurons utilize tetrodotoxin-sensitive sodium and high-TEA potassium currents for pacemaking. Unlike rats, mice lack a persistent calcium current during the interspike interval.

Area of Science:

  • Neuroscience
  • Electrophysiology
  • Ion Channel Physiology

Background:

  • Locus coeruleus (LC) neurons are crucial for regulating arousal and stress.
  • Understanding the ionic mechanisms underlying LC neuron pacemaking is essential for neurological research.

Purpose of the Study:

  • To characterize the ion currents active during the interspike interval in mouse LC neurons.
  • To compare these currents with those found in rat LC neurons.

Main Methods:

  • Application of depolarizing ramps and pulses to mouse LC neurons.
  • Pharmacological isolation of ion currents using tetrodotoxin (TTX) and tetraethylammonium chloride (TEA).
  • Voltage clamp recordings and reconstruction of net ramp-induced currents.

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Last Updated: Jun 11, 2026

Localization of the Locus Coeruleus in the Mouse Brain
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Localization of the Locus Coeruleus in the Mouse Brain

Published on: March 7, 2019

Methods for the Isolation, Culture, and Functional Characterization of Sinoatrial Node Myocytes from Adult Mice
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Methods for the Isolation, Culture, and Functional Characterization of Sinoatrial Node Myocytes from Adult Mice

Published on: October 23, 2016

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
09:20

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Main Results:

  • A tetrodotoxin (TTX)-sensitive sodium current was the sole inward conductance during the interspike interval.
  • A high-TEA (15 mM) sensitive potassium current accounted for nearly all potassium conductance.
  • No persistent calcium current was detected during the interspike interval in mice, unlike in rats.

Conclusions:

  • The interspike interval pacemaker mechanism in mouse LC neurons involves TTX-sensitive Na(+) and high-TEA sensitive K(+) currents.
  • Significant species-specific differences exist in LC neuron pacemaking, particularly regarding calcium current involvement.