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Updated: Jun 27, 2026

Studying the Coding Profiles of Somatic Stimulation on Cardiac-locked Neuronal Responses in the Rat Spinal Dorsal Horn
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Published on: May 23, 2025

Long-loop pathways in cardiovascular electroacupuncture responses.

Peng Li1, Stephanie C Tjen-A-Looi, Zhi-Ling Guo

  • 1Department of Medicine, University of California, Irvine, CA, USA. pengli@uci.edu

Journal of Applied Physiology (Bethesda, Md. : 1985)
|December 17, 2008
PubMed
Summary
This summary is machine-generated.

Electroacupuncture (EA) activates arcuate (ARC) neurons, which inhibit cardiovascular sympathoexcitatory neurons. The ventrolateral periaqueductal gray (vlPAG) is crucial for this ARC-mediated inhibition, with direct ARC to rostral ventrolateral medulla (rVLM) projections also identified.

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Effects of Different Connection Modes of Electroacupuncture on Electrocardiogram and Nerve Discharge in Rats
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Studying the Coding Profiles of Somatic Stimulation on Cardiac-locked Neuronal Responses in the Rat Spinal Dorsal Horn
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Effects of Different Connection Modes of Electroacupuncture on Electrocardiogram and Nerve Discharge in Rats
04:33

Effects of Different Connection Modes of Electroacupuncture on Electrocardiogram and Nerve Discharge in Rats

Published on: January 3, 2025

Area of Science:

  • Neuroscience
  • Cardiovascular Physiology
  • Acupuncture Research

Background:

  • Electroacupuncture (EA) at P 5-6 acupoints activates arcuate (ARC) neurons.
  • These ARC neurons influence cardiovascular control by inhibiting sympathoexcitatory neurons in the rostral ventrolateral medulla (rVLM).
  • The precise pathway and role of the ventrolateral periaqueductal gray (vlPAG) in this ARC-mediated inhibition remain unclear.

Purpose of the Study:

  • To investigate whether the ARC inhibits rVLM activity directly or indirectly via the vlPAG.
  • To elucidate the role of the vlPAG in mediating the cardiovascular effects of EA.
  • To identify the neural pathways involved in EA-induced cardiovascular regulation.

Main Methods:

  • Neural recordings and microinjections in the ARC, vlPAG, and rVLM of rats.
  • Stimulation of the splanchnic nerve to activate rVLM neurons.
  • Inhibition of ARC or vlPAG neuronal activity using kainic acid (KA).
  • Retrograde tracing and immunohistochemistry to identify neuronal projections and activation markers (beta-endorphin, c-Fos).

Main Results:

  • Inhibiting ARC neurons with KA blocked EA's inhibitory effect on rVLM activity.
  • Stimulating ARC neurons with d,l-homocysteic acid mimicked EA's inhibitory effect on rVLM.
  • Bilateral microinjection of KA into the caudal vlPAG completely reversed EA-induced inhibition of rVLM neuronal activity.
  • ARC neurons project to the rVLM and are activated by EA, expressing beta-endorphin and c-Fos.

Conclusions:

  • The vlPAG, particularly the caudal part, is essential for ARC-mediated inhibition of rVLM activation during EA.
  • Direct projections from the ARC to the rVLM exist and contribute to EA's cardiovascular effects.
  • EA-induced cardiovascular inhibition involves a complex neural circuit including the ARC, vlPAG, and rVLM.