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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/17710

Title: Dopaminergic Control of Trigeminal Motor Outflow to Upper Airway Muscles in Anaesthetized Rats
Authors: Schwarz, Peter Bogdan
Advisor: Peever, John H.
Department: Cell and Systems Biology
Keywords: dopamine
trigeminal motor nucleus
tensor palatini
obstructive sleep apnea
upper airway patency
Issue Date: 22-Sep-2009
Abstract: The role of dopamine in directly modulating somatic motoneuron excitability and hence muscle tone is unknown. We investigated whether dopamine influences the trigeminal motor pool (MoV) that innervates the masseter and tensor palatini muscles, both of which function to maintain upper airway patency. We hypothesized that dopamine facilitates motor outflow at the MoV. We focally applied apomorphine (nonspecific dopamine receptor agonist) at the MoV in anaesthetized rats. We also applied receptor-specific agonists and antagonists to determine the receptor subtype mediating dopaminergic mechanisms of action. We demonstrated that dopaminergic transmission at the MoV potently increased motor outflow via the D1-like receptor and facilitated masseter and tensor palatini muscle tone. It is unknown whether endogenous dopamine release on to airway motoneurons influences their activity to regulate muscle tone in natural sleep-wake behaviours. This issue warrants investigation because the neurochemical basis of upper airway motor dysfunction (e.g. obstructive sleep apnea) remains poorly characterized.
URI: http://hdl.handle.net/1807/17710
Appears in Collections:Master
Department of Cell and Systems Biology - Master theses

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