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Christopher Del Negro

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Outward Currents Contributing To Inspiratory Burst Termination In Prebotzinger Complex Neurons Of Neonatal Mice Studied In Vitro, Rebecca Kray, Adam M. Goodreau, Thomas B. Arnold, Christopher A. Del Negro Jul 2019

Outward Currents Contributing To Inspiratory Burst Termination In Prebotzinger Complex Neurons Of Neonatal Mice Studied In Vitro, Rebecca Kray, Adam M. Goodreau, Thomas B. Arnold, Christopher A. Del Negro

Christopher Del Negro

We studied pre-Botzinger(preBotC) inspiratory interneurons to determine the cellular mechanisms that influence burst termination in a mammalian central pattern generator. Neonatal mouse slice preparations that retain pre-BoTC neurons generate respiratory motor rhythms in vitro. Inspiratory-related bursts rely on inward currents that flux Na+, thus outward currents coupled to Na+ accumulation are logical candidates for assisting in, or causing, burst termination. We examined Na+/K+/ATPase electrogenic pump current (Ipump), Na+-dependent K+ current, and ATP-dependent K+ current (IK-ATP). The pharmacological blockade of IPUMP, IK-Na, or IK-ATP caused pathological depolarization akin to a burst that ...