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Section on Neuronal Circuitry
Catherine Weisz, Ph.D., Acting Chief
The laboratory of neuronal circuitry (1) investigates the communication between neurons of the auditory system; (2) employs electrophysiology and optical techniques in in vitro preparations to study synaptic transmission between neurons; (3) integrates knowledge of neuronal synaptic inputs with electrical properties to determine the functional properties of neurons of the auditory system; (4) extends knowledge gained from in vitro brain and cochlea preparations to animal models including models of acoustic trauma; and (5) seeks to understand how the interplay between auditory neuronal pathways shapes acoustic perception in both the normal and damaged auditory system.
Current Areas of Interest
We use mouse models to study synaptic inputs and outputs of brainstem olivocochlear efferent neurons that project to the cochlea. Projects in the lab use the techniques of whole cell patch clamp recordings from auditory neuron somata and dendrites, combined with optogenetics and imaging of neuronal activity. Using these tools we dissect the synaptic inputs to the olivocochlear efferents in the brainstem, to determine how they are activated and modulated. Projects in the lab also examine how the activity of the efferent neurons changes after noise trauma or during disease. Parallel experimentation investigates the complex outputs of olivocochlear efferent neurons in the cochlea, using dendritic recording techniques from spiral ganglion afferent neurons and hair cells, paired with imaging techniques. The in-depth investigation of synaptic circuitry of olivocochlear efferent neurons will give insight into roles that the neurons play in both the healthy and diseased cochlea, and will be used to provide targets for therapeutic manipulation of the efferent system.
Front row L-R: Catherine Weisz, Alia Pederson. Back row L-R: Lester Torres Cadenas, Sian Kitcher, Matt Fischl.
- Catherine Weisz, Ph.D. Tenure-Track Investigator +1 301 827 9014 (Send e-mail)
- Mary (Grace) Chaves, B.A. Postbaccalaureate IRTA Fellow +1 301 827 9014 (Send e-mail)
- Matthew Fischl, Ph.D. Postdoctoral IRTA Fellow +1 301 827 9014 (Send e-mail)
- Sian Kitcher, Ph.D. Postdoctoral IRTA Fellow +1 301 827 9014 (Send e-mail)
- Kirupa Suthakar, Ph.D. Postdoctoral Visiting Fellow +1 301 827 9014 (Send e-mail)
- Lester Torres Cadenas, M.S. Biologist +1 301 402 4219 (Send e-mail)
- Torres Cadenas, L., Fischl, M. J. & Weisz, C. J. C. Synaptic inhibition of medial olivocochlear efferent neurons by neurons of the medial nucleus of the trapezoid body.J. Neurosci 2020 Jan 15; 40, 509–525.
- Weisz, C.J.C., Givens, R.S., Rubio, M.E., Kandler, K. Excitation by inter-axonal GABA spillover in a sound localization circuit. J. Neurosci, 2016 Jan 20; 36(3):911-25.
- Sturm JJ and Weisz CJC. Hyperactivity in the medial olivocochlear system is a common feature of tinnitus and hyperacusis in humans. J. Neurophys, Neuroforum 2015 Nov;114(5):2551–4.
- Clause A, Kim G, Weisz CJC, Rubsamen R, Vetter D, Kandler K. The precise temporal pattern of pre-hearing spontaneous activity is necessary for tonotopic map refinement. Neuron, 2014 May 21; 82(4), 822–835.
- Weisz CJC, Glowatzki E, Fuchs P. Excitability of type II cochlear afferents. J. Neurosci. 2014 Feb 5; 34(6), 2365–73.
- Weisz CJC, Lehar M, Hiel H, Glowatzki E, Fuchs PA. Synaptic transfer from outer hair cells to type II afferent fibers in the rat cochlea. J. Neurosci. 2012 Jul 11; 32(28):9528–36.
- Weisz C, Glowatzki E, Fuchs P. The postsynaptic Function of type II cochlear afferents. Nature 461, 2009 Oct 22; 1126–9.
- Weisz CJC, Raike RS, Soria-Jasso LE, Hess EJ. Potassium channel blockers inhibit the triggers of attacks in the calcium channel mouse mutant tottering. J. Neurosci, 2005 April; 25(16):4141–4145.