Evolving Pain Resistance | The Scientist Magazine® - 1 views
www.the-scientist.com/?articles.view/articleNo/38012/title/Evolving-Pain-Resistance/
pain resistance science research
shared by grayton downing on 27 Oct 13
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Grasshopper mice of the southwestern US deserts (Onychomys torridus) have evolved to take advantage of a normally well-protected food source:
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results suggested that rather than blocking the binding of the venom altogether, the grasshopper mouse had evolved a strategy to block the transmission of pain when the venom was bound. Sure enough, when the team pre-treated the mice with venom, and then administered a painful formalin stimulus, the mice were protected from the pain.
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further investigate how the scorpion venom inhibits the transmission of pain, Rowe and her colleagues sequenced the Nav1.8 channel, replaced grasshopper mouse sequences with house mouse sequences, and expressed the mutant channels in a cell line to observe the effects of the genetic changes.
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“a really small amount of variation—one amino acid—can actually produce these really profound physiological effects,” Rowe said. “Evolutionarily speaking, it allows this mouse to then feed on a chemically protected scorpion.”