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Journal of Neurophysiology, Vol 72, Issue 5 2538-2541, Copyright © 1994 by APS
ARTICLES |
G. D. Funk, J. C. Smith and J. L. Feldman
Department of Physiological Science, University of California, Los Angeles 90024-1527.
1. The ontogeny of thyrotropin-releasing hormone (TRH) and norepinephrine (NE) potentiation of inspiratory-related hypoglossal (XII) motor nerve discharge was studied in medullary slices from P0-3, P7, and P11-14 mice that retain functional networks for respiration. 2. TRH, applied locally to the XII motor nucleus, had no effect on XII inspiratory burst amplitude in slices from P0-3 mice. By P7 there was significant potentiation of burst amplitude that increased more than three-fold by P11-14. NE applied to the XII nucleus produced significant potentiation in all age groups. Potentiation increased developmentally with the largest increase occurring between P0-3 and P7. 3. Thus catecholamine and TRH modulation of inspiratory-related XII nerve activity increases during the first two weeks of life; the potentiating effects of NE appear prior to those of TRH. 4. With rhythmically active, transverse medullary slices from mice up to 2 wk of age, it is now possible to study the development of XII motoneuron modulation as it relates to respiratory control of the upper airway.
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