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Related Experiment Video

Updated: Jul 14, 2026

In Vitro Recording of Mesenteric Afferent Nerve Activity in Mouse Jejunal and Colonic Segments
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Published on: October 25, 2016

Spontaneous electrical activity in sheep mesenteric lymphatics.

E A H Beckett1, M A Hollywood, K D Thornbury

  • 1Smooth Muscle Research Centre, Dundalk Institute of Technology, Dundalk, County Louth, Ireland.

Lymphatic Research and Biology
|May 19, 2007
PubMed
Summary

The electrical activity of lymphatic smooth muscle cells is crucial for lymphatic pumping. This study reveals the specific ion currents involved in spontaneous electrical activity, providing insights into lymphatic function.

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Area of Science:

  • Physiology
  • Cardiovascular Biology
  • Electrophysiology

Background:

  • The lymphatic system's pumping mechanism is electrically complex, comparable to the heart.
  • Previous studies identified currents in isolated lymphatic smooth muscle cells, but their role in the intact system was unknown.

Purpose of the Study:

  • To investigate the electrophysiological basis of lymphatic pumping in intact sheep mesenteric lymphatics.
  • To determine the role of specific ion currents in the spontaneous electrical activity of lymphatic smooth muscle.

Main Methods:

  • Intracellular microelectrode recordings from sheep mesenteric lymphatic smooth muscle.
  • Application of various pharmacological agents to modulate ion channel activity (e.g., 2-APB, Cs+, nifedipine, TTX, 9-AC, Penitrem-A, 4-AP).

Main Results:

  • ~50% of vessels showed spontaneous electrical activity, including oscillations and spike complexes.
  • Norepinephrine induced depolarizing events; 2-APB attenuated these activities.
  • Cesium (Cs+) reduced firing frequency and affected the plateau phase.
  • Nifedipine abolished spontaneous events; TTX reduced spike upstroke.
  • Chloride channel blockers (9-AC) inhibited activity, suggesting a role for I(Cl(Ca)).
  • Penitrem-A affected action potential amplitude and plateau, indicating a minor role for calcium-activated potassium current in resting conductance.
  • 4-aminopyridine (4-AP) caused depolarization, suggesting an active 4-AP-sensitive current at rest.

Conclusions:

  • Ion currents identified in isolated lymphatic cells significantly shape the spontaneous electrical activity of the intact lymphatic syncitium.
  • This study elucidates the electrophysiological underpinnings of lymphatic pumping.