Propofol (2,6-diisopropylphenol) is an applicable immersion anesthetic in the axolotl with potential uses in hemodynamic and neurophysiological experiments

Mathias Møller Thygesen, Mikkel Mylius Rasmussen, Jesper Guldsmed Madsen, Michael Pedersen, Henrik Lauridsen
TheMexican axolotl (Ambystoma mexicanum) is an important model species in regenerative biol- ogy. Traditionally, axolotls are anesthetized using benzocaine or MS-222, both of which act to inhibit voltage gated sodium channels thereby preventing action potential propagation. In some neurophysiological experiments this is not desirable; thereforewe tested propofol as an alterna- tive anesthetic in the axolotl.We evaluated benzocaine, MS-222, and propofol’s cardiovascular effects, effects on action potential propagation in the spinal cord, and gross limb regenerative effects.We found that propofol is applicable as a general anesthetic in the axolotl allowing for neurophysiological experiments and yielding a stable anesthesiawith significantly less cardiovas- cular effect than both benzocaine and MS-222. Additionally, propofol did not affect gross limb regeneration. In conclusion we suggest the consideration of propofol as an alternative immersion anesthetic to benzocaine and MS-222.

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