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Hypothalamic clock governs circadian pain.

Hong-Rui Wei1,2, Qianqian Lou1, Le-Xian Li1

  • 1Department of Anesthesiology, The First Affiliated Hospital of USTC, Center for Advanced Interdisciplinary Science and Biomedicine of IHM, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, PR China.

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Chronic pain shows daily rhythms. A hypothalamic circuit involving vasoactive intestinal peptide (VIP) neurons in the suprachiasmatic nucleus (SCN) regulates pain sensitivity, offering new targets for pain management.

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Area of Science:

  • Neuroscience
  • Chronobiology
  • Pain Research

Background:

  • Chronic pain exhibits circadian rhythms in humans, but the underlying mechanisms are not fully understood.
  • Understanding the biological basis of pain rhythmicity is crucial for developing effective pain management strategies.

Purpose of the Study:

  • To elucidate the neural circuit responsible for daily oscillations in nociceptive thresholds in a mouse model of neuropathic pain.
  • To identify the role of the master clock and descending analgesia systems in pain rhythmicity.

Main Methods:

  • Investigated daily oscillations in nociceptive thresholds in a mouse model of neuropathic pain.
  • Mapped a rhythmic circuit from the hypothalamic master clock (suprachiasmatic nucleus) to the descending analgesia system (paraventricular nucleus and ventrolateral periaqueductal gray).

Main Results:

  • Identified a novel circuit where suprachiasmatic nucleus vasoactive intestinal peptide (SCNVIP) neuronal activity drives daily pain rhythmicity.
  • During the daytime (resting phase), high SCNVIP activity increases pain sensitivity via the paraventricular nucleus (PVN) and ventrolateral periaqueductal gray (vlPAG).
  • During the nighttime (active phase), reduced SCNVIP activity decreases pain sensitivity through the same circuit.

Conclusions:

  • A hypothalamic circuit regulating pain rhythmicity has been identified, linking the master clock to descending pain modulation.
  • This SCNVIP-PVN-vlPAG pathway offers a potential therapeutic target for managing chronic pain by modulating its circadian fluctuations.