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[Interaction of 5-HT2 and 5-HT3 receptor subtype in 5-HT-induced nociceptive responses in peripheral primary sensory

Jian Zhang1, Wang-Ping Hu, Ke-Chun Zhou

  • 1Department of Neurobiology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.

Zhongguo Ying Yong Sheng Li Xue Za Zhi = Zhongguo Yingyong Shenglixue Zazhi = Chinese Journal of Applied Physiology
|December 29, 2010
PubMed
Abstract

Insights

Serotonin receptor 3 (5-HT3R) initiates 5-HT-induced pain, while serotonin receptor 2 (5-HT2R) maintains and modulates this nociceptive response in primary afferents. This research clarifies the roles of specific serotonin receptors in pain signaling.

Area of Science:

  • Neuroscience
  • Pharmacology

Context:

  • Serotonin (5-HT) is a key neurotransmitter involved in various physiological processes, including pain perception.
  • Peripheral primary afferents play a crucial role in transmitting nociceptive signals to the central nervous system.

Purpose:

  • To investigate the specific contributions of serotonin receptor subtypes (5-HT1R, 5-HT2R, 5-HT3R) to 5-HT-induced pain responses.
  • To elucidate the roles of these receptors at the level of peripheral primary afferent neurons.

Summary:

  • Whole-cell patch clamp recordings on trigeminal ganglion neurons revealed that 5-HT induced a concentration-dependent inward current (I(5-HT)) mediated by 5-HT3R.
  • This current was potentiated by a 5-HT2R agonist but not by a 5-HT1R agonist.
  • Behavioral experiments in rats showed that 5-HT induced a dose-dependent increase in hindpaw lifting time, with 5-HT3R and 5-HT2R antagonists affecting this response.

Impact:

  • The findings suggest that 5-HT3R initiates 5-HT-induced nociception at the primary sensory level.
  • 5-HT2R appears to mediate the maintenance and modulation of nociceptive information transmission.
  • This study provides a deeper understanding of the neurobiological mechanisms underlying 5-HT-mediated pain signaling.

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