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Am J Physiol Regul Integr Comp Physiol (July 11, 2002). doi:10.1152/ajpregu.00075.2002
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Articles in PresS, published online ahead of print July 11, 2002
Am J Physiol Regu Physiol, 10.1152/ajpregu.00075.2002
Submitted on February 6, 2002
Accepted on July 4, 2002

In vivo electrophysiological responses of pedunculopontine neurons to static muscle contraction

Edward D Plowey1, Jeffery M Kramer1, Joseph A Beatty1, and Tony G Waldrop2*

1 Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
2 Depatment of Cell and Molecular Physiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA

* To whom correspondence should be addressed. E-mail: twaldrop{at}unc.edu.

The pedunculopontine nucleus (PPN) has previously been implicated in central command regulation of the cardiorespiratory adjustments that accompany exercise. The current study was executed to begin to address the potential role of the PPN in the regulation of cardiorespiratory adjustments evoked by muscle contraction. Extracellular single-unit recording was employed to document the responses of PPN neurons during static muscle contraction. Sixty-four percent (20/31) of neurons sampled from the PPN responded to static muscle contraction with increases in firing rate. Furthermore, muscle contraction responsive neurons in the PPN were unresponsive to brief periods of hypotension, but were markedly activated during chemical disinhibition of the caudal hypothalamus (CH). A separate sample of PPN neurons was found to be moderately activated during systemic hypoxia. Chemical disinhibition of the PPN was found to markedly increase respiratory drive. These findings suggest that the PPN may be involved in modulating respiratory adjustments that accompany muscle contraction and that PPN neurons may have the capacity to synthesize muscle reflex and central command influences.




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