Shrub-derived compound eases nerve pain by cooling spinal inflammation
Liang W, Zhang M, Cheng L, Huang Z, Zhang L
Medicinal Plants
The unassuming Daphne shrub some gardeners grow for its fragrant winter blooms has been a source of pain-relieving folk remedies in China for centuries, and this study shows exactly how one of its compounds works at the molecular level.
Scientists studied a natural compound called daphnetin, found in a plant called Daphne giraldii, to see how it helps with nerve pain. In rats with an injured nerve, the compound calmed down overactive immune cells in the spinal cord by flipping a molecular switch, which reduced pain and improved how the rats walked. This helps explain why a plant used in traditional medicine actually works, and could lead to new pain treatments.
Key Findings
Daphnetin increased pain thresholds (mechanical and thermal) and improved gait in rats with chronic nerve injury.
The compound shifted spinal immune cells (microglia) from an inflammatory M1 state to a protective M2 state by activating the Nrf2 pathway and blocking the NLRP3 inflammasome.
Daphnetin was shown to bind directly to two specific sites (Tyr334 and Tyr572) on the Keap1 protein, revealing its precise molecular target for the first time.
chevron_right Technical Summary
A compound from a traditional Chinese medicinal shrub reduced nerve pain in rats by calming inflammation in the spinal cord, pointing to a possible new drug pathway for chronic nerve pain that is notoriously hard to treat.
Abstract Preview
Original paper
Daphnetin alleviates neuropathic pain in rats by modulating spinal microglial polarization via the Nrf2/NLRP3 inflammasome pathway.
Neuropathic pain (NP) is a frequent sequel to peripheral nerve injury and maladaptive nervous system function. Daphnetin (DAP), a bioactive 7,8-dihydroxycoumarin derived from the traditional Chines...
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Daphne giraldii is a shrub, of the family Thymelaeaceae. It is deciduous, and is found in regions of China.