Centipedes subdue giant prey by blocking KCNQ channels
Lei Luo1,2,3, Bowen Li1,2,3, Sheng Wang4
1Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences, Kunming Institute of Zoology, Kunming 650223, Yunnan, China.
Summary
Giant centipede venom rapidly incapacitates prey by blocking KCNQ potassium channels. A specific peptide toxin (SsTx) targets these channels, but a KCNQ opener can neutralize its lethal effects.
Area of Science:
- Toxicology
- Neuroscience
- Pharmacology
Background:
- Centipede venom is a complex mixture of toxins.
- Venom synthesis is metabolically costly, implying efficient mechanisms of action.
- Centipedes subdue prey much larger than themselves rapidly.
Purpose of the Study:
- To investigate the mechanism by which the centipede Scolopendra subspinipes mutilans rapidly subdues large prey.
- To identify the specific toxin responsible for lethal effects.
- To explore potential therapeutic interventions for centipede envenomation.
Main Methods:
- Venom extraction and analysis.
- Electrophysiological recordings to assess toxin activity on ion channels.
- In vivo testing of venom and toxin lethality.
- Pharmacological neutralization assays using a KCNQ channel opener.
Main Results:
- A peptide toxin, SsTx, was identified as the primary component responsible for rapid prey incapacitation.
- SsTx was shown to specifically block KCNQ potassium channels.
- The KCNQ channel opener retigabine effectively neutralized the lethal toxicity of the centipede venom.
- KCNQ channel blockade disrupts multiple physiological systems, including cardiovascular, respiratory, muscular, and nervous systems.
Conclusions:
- Centipede venom has evolved a potent strategy targeting broadly distributed KCNQ channels for rapid, multi-systemic disruption.
- SsTx is a key toxin mediating this effect.
- Targeting KCNQ channels offers a promising therapeutic strategy against centipede envenomation.
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