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Related Concept Videos

G-Protein Gated Ion Channels01:21

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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
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The regulation of heart rate is a complex process controlled by the autonomic nervous system (ANS), hormonal influences, and intrinsic cardiac mechanisms. The ANS has two main components: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).
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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...
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Related Experiment Video

Updated: Nov 9, 2025

Yeast Luminometric and Xenopus Oocyte Electrophysiological Examinations of the Molecular Mechanosensitivity of TRPV4
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TRPM4 keeps up the pace.

Wojciech Ambroziak1, Jan Siemens1

  • 1Department of Pharmacology, University of Heidelberg, Im Neuenheimer Feld 366, Heidelberg, 69120, Germany.

Cell Calcium
|April 8, 2021
PubMed
Summary
This summary is machine-generated.

Researchers identified the TRPM4 ion channel as crucial for the rhythmic activity of breathing control neurons. This finding is relevant for understanding respiratory control and maintaining homeostasis.

Keywords:
Trp ion channelaction potentialautonomous firingpacemaking

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Area of Science:

  • Neuroscience
  • Physiology

Background:

  • The retrotrapezoid nucleus (RTN) is a key brainstem area controlling breathing.
  • Rhythmic activity of RTN neurons is essential for respiratory control and homeostasis.
  • Ionic mechanisms underlying RTN neuron activity are not fully understood.

Purpose of the Study:

  • To pharmacologically characterize the ionic mechanisms of RTN neuron rhythmic activity.
  • To investigate the role of the transient receptor potential melastatin 4 (TRPM4) ion channel in RTN neuron function.

Main Methods:

  • Electrophysiological recordings in brainstem slices.
  • Pharmacological manipulation of TRPM4 ion channel activity.
  • Analysis of subthreshold oscillations and action potential firing.

Main Results:

  • TRPM4 ion channels significantly contribute to subthreshold excitatory oscillations in RTN neurons.
  • TRPM4 channels are involved in the pacemaking activity (tonic action potential firing) of RTN neurons.
  • These findings provide insights into the ionic basis of respiratory rhythm generation.

Conclusions:

  • The TRPM4 ion channel plays a critical role in the intrinsic rhythmic activity of RTN neurons.
  • Understanding TRPM4's function is relevant for respiratory control and maintaining physiological homeostasis.
  • This study advances the pharmacological characterization of ion channels involved in breathing regulation.