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Biophysical and Molecular Mechanisms of Resurgent Na Current in Neurons

When: Monday, November 18, 2019
4:00 PM - 5:00 PM  

Where: Ward Building, Room 5-230, 303 E. Chicago Avenue, Chicago, IL 60611 map it

Audience: Faculty/Staff - Student - Public - Post Docs/Docs - Graduate Students

Contact: Lexi Nash   312.503.4893

Group: Department of Pharmacology Seminars

Category: Lectures & Meetings


Indira M. Raman, Ph.D.
Bill and Gayle Cook Professor of Neurobiology
Northwestern University

Resurgent Na+ current results from a distinctive form of Na+ channel gating, originally identified in cerebellar Purkinje neurons. In these neurons, the tetrodotoxin-sensitive voltage-gated Na+ channels responsible for action potential firing have specialized mechanisms that reduce the likelihood that they accumulate in fast inactivated states, thereby shortening refractory periods and permitting rapid, repetitive, and/or burst firing. Under voltage clamp, step depolarizations evoke transient Na+ currents that rapidly activate and quickly decay, and step repolarizations elicit slower channel reopening, or a ‘resurgent’ current. The generation of resurgent current depends on a factor in the Na+ channel complex that blocks open Na+ channels at positive voltages, competing with the fast inactivation gate, and unblocks at negative voltages, permitting recovery from an open channel block along with a flow of current. Following its initial discovery, resurgent Na+ current has been found in nearly 20 types of neurons. Emerging research suggests that resurgent current is preferentially increased in a variety of clinical conditions associated with altered cellular excitability. This seminar will discuss the biophysical and molecular mechanisms of resurgent current and their relation to the normal functions of excitable cells.

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