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Full-Text Articles in Medicine and Health Sciences
A Latent Propriospinal Network Can Restore Diaphragm Function After High Cervical Spinal Cord Injury, Jared M. Cregg, Kevin A. Chu, Lydia E. Hager, Rachel S. J. Maggard, Daimen R. Stoltz, Michaela Edmond, Warren J. Alilain, Polyxeni Philippidou, Lynn T. Landmesser, Jerry Silver
A Latent Propriospinal Network Can Restore Diaphragm Function After High Cervical Spinal Cord Injury, Jared M. Cregg, Kevin A. Chu, Lydia E. Hager, Rachel S. J. Maggard, Daimen R. Stoltz, Michaela Edmond, Warren J. Alilain, Polyxeni Philippidou, Lynn T. Landmesser, Jerry Silver
Spinal Cord and Brain Injury Research Center Faculty Publications
Spinal cord injury (SCI) above cervical level 4 disrupts descending axons from the medulla that innervate phrenic motor neurons, causing permanent paralysis of the diaphragm. Using an ex vivo preparation in neonatal mice, we have identified an excitatory spinal network that can direct phrenic motor bursting in the absence of medullary input. After complete cervical SCI, blockade of fast inhibitory synaptic transmission caused spontaneous, bilaterally coordinated phrenic bursting. Here, spinal cord glutamatergic neurons were both sufficient and necessary for the induction of phrenic bursts. Direct stimulation of phrenic motor neurons was insufficient to evoke burst activity. Transection and pharmacological manipulations …
Effects On Breathing Of Agonists To Μ-Opioid Or GabaA Receptors Dialyzed Into The Ventral Respiratory Column Of Awake And Sleeping Goats, Thomas M. Langer Iii, Suzanne E. Neumueller, Emma Crumley, Nicholas J. Burgraff, Sawan Talwar, Matthew R. Hodges, Lawrence Pan, Hubert V. Forster
Effects On Breathing Of Agonists To Μ-Opioid Or GabaA Receptors Dialyzed Into The Ventral Respiratory Column Of Awake And Sleeping Goats, Thomas M. Langer Iii, Suzanne E. Neumueller, Emma Crumley, Nicholas J. Burgraff, Sawan Talwar, Matthew R. Hodges, Lawrence Pan, Hubert V. Forster
Physical Therapy Faculty Research and Publications
Pulmonary ventilation (V̇I) in awake and sleeping goats does not change when antagonists to several excitatory G protein-coupled receptors are dialyzed unilaterally into the ventral respiratory column (VRC). Concomitant changes in excitatory neuromodulators in the effluent mock cerebral spinal fluid (mCSF) suggest neuromodulatory compensation. Herein, we studied neuromodulatory compensation during dialysis of agonists to inhibitory G protein-coupled or ionotropic receptors into the VRC. Microtubules were implanted into the VRC of goats for dialysis of mCSF mixed with agonists to either μ-opioid (DAMGO) or GABAA (muscimol) receptors. We found: (1) V̇I decreased during unilateral but increased during …
State-Dependent And -Independent Effects Of Dialyzing Excitatory Neuromodulator Receptor Antagonists Into The Ventral Respiratory Column, Thomas M. Langer Iii, Suzanne E. Neumueller, Emma Crumley, Nicholas J. Burgraff, Sawan Talwar, Matthew R. Hodges, Lawrence Pan, Hubert V. Forster
State-Dependent And -Independent Effects Of Dialyzing Excitatory Neuromodulator Receptor Antagonists Into The Ventral Respiratory Column, Thomas M. Langer Iii, Suzanne E. Neumueller, Emma Crumley, Nicholas J. Burgraff, Sawan Talwar, Matthew R. Hodges, Lawrence Pan, Hubert V. Forster
Physical Therapy Faculty Research and Publications
Unilateral dialysis of the broad-spectrum muscarinic receptor antagonist atropine (50 mM) into the ventral respiratory column [(VRC) including the pre-Bötzinger complex region] of awake goats increased pulmonary ventilation (V̇i) and breathing frequency (f), conceivably due to local compensatory increases in serotonin (5-HT) and substance P (SP) measured in effluent mock cerebral spinal fluid (mCSF). In contrast, unilateral dialysis of a triple cocktail of antagonists to muscarinic (atropine; 5 mM), neurokinin-1, and 5-HT receptors does not alter V̇i or f, but increases local SP. Herein, we tested hypotheses that 1) local compensatory 5-HT and SP responses to 50 mM atropine …