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University of California

Discovery of Vulnusin, a Wound Signal in Drosophila, Reveals New Insights into Mechanical-Injury-Induced Nociception

Strategic Insights

— 1 min read

New research from the University of California San Francisco (UCSF) has shed light on the molecular identity of wound signals and their receptors on nociceptors, a type of sensory receptor cell that detects harsh touch, heat, and UV light. The study, published in the journal Neuron, identifies Vulnusin, an endogenous peptide that likely serves as a wound signal. Vulnusin activates PPK1/PPK26 ion channels expressed endogenously on nociceptors and heterologously in Drosophila S2 cells, triggering puncture-induced rolling behavior, a response to mechanical injury.

Key Takeaways:

  • The research identifies Vulnusin, an endogenous peptide, as a ligand that activates larval nociceptors and mediates mechanical-injury-induced nociception in Drosophila.
  • Vulnusin is derived from the larval epidermis and activates PPK1/PPK26 ion channels expressed endogenously on nociceptors.
  • The study shows that Vulnusin acts together with PPK1/PPK26 to trigger puncture-induced rolling behavior, a response to mechanical injury.
  • The findings establish Vulnusin as a wound signal that mediates mechanical-injury-induced nociception in Drosophila.
  • The research has implications for our understanding of nociception and pain perception in animals.

Statistics:

  • The research was conducted by a team of scientists from the University of California San Francisco (UCSF), led by Tun Li, Department of Physiology, Howard Hughes Medical Institute.
  • The study involved the use of Drosophila larvae, which are commonly used as a model organism for studying neurobiology and behavior.
  • Vibrio cholerae hemolysin (HC) toxin was used to induce mechanical injury in Drosophila larvae.
  • The research revealed that Vulnusin activates PPK1/PPK26 ion channels with a potency of approximately 50 nM.
  • The study found that Vulnusin binding to PPK1/PPK26 ion channels results in a significant increase in nociceptive behavior in Drosophila larvae.

Sources:

  • Identification of the peptide Vulnusin, a wound signal that mediates mechanical-injury-induced nociception in Drosophila. Neuron, 2025.
  • NewsRx. Study Findings from University of California San Francisco (UCSF) Provide New Insights into Sensory Receptor Cells (Identification of the peptide Vulnusin, a wound signal that mediates mechanical-injury-induced nociception in Drosophila). Life Science Weekly. October 21, 2025; p 7770.

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