RT Journal Article SR Electronic T1 Mechanosensory Stimulation Evokes Acute Concussion-Like Behavior by Activating GIRKs Coupled to Muscarinic Receptors in a Simple Vertebrate JF eneuro JO eNeuro FD Society for Neuroscience SP ENEURO.0073-17.2017 DO 10.1523/ENEURO.0073-17.2017 VO 4 IS 2 A1 Li, Wen-Chang A1 Zhu, Xiao-Yue A1 Ritson, Emma YR 2017 UL http://www.eneuro.org/content/4/2/ENEURO.0073-17.2017.abstract AB Most vertebrates show concussion responses when their heads are hit suddenly by heavy objects. Previous studies have focused on the direct physical injuries to the neural tissue caused by the concussive blow. We study a similar behavior in a simple vertebrate, the Xenopus laevis tadpole. We find that concussion-like behavior can be reliably induced by the mechanosensory stimulation of the head skin without direct physical impacts on the brain. Head skin stimulation activates a cholinergic pathway which then opens G protein-coupled inward-rectifying potassium channels (GIRKs) via postsynaptic M2 muscarinic receptors to inhibit brainstem neurons critical for the initiation and maintenance of swimming for up to minutes and can explain many features commonly observed immediately after concussion. We propose that some acute symptoms of concussion in vertebrates can be explained by the opening of GIRKs following mechanosensory stimulation to the head.