Swallowing, one of the more complex motor behaviors is programmed centrally by a medullary central pattern generator located in and around the nucleus of the solitary tract. The generation and modulation of neuronal patterned motor activity by the central pattern generator is dependent upon endogenous excitatory and inhibitory mechanisms and requisite central and peripheral afferent contacts. A significant imbalance in the relative contribution of excitation via NMDA and inhibition via GABA receptors may form the basis of dysfunctional swallowing present in neurological disease. Utilizing the rat as animal model, the anatomic basis of the excitatory and inhibitory processes critical to the coordination of the buccupharyngeal and esophageal phases of swallowing will be studied. Transsynaptic tracing with Pseudorabies Virus in conjunction with: (1) Fluorescent retrograde tracing will be utilized to study the anatomical connections between the buccopharyngeal and esophageal central pattern generator networks at the premotor neuron level; (2) In situ hybridization with oligonucleotide probes for the different N-Methyl-D-aspartate (NMDA) receptor subunits (R1, R2A- D) and GABAA receptor subunits (alpha1-6, beta1-3, gamma1-3, delta) will be utilized to determine the NMDA and GABAA receptor subunits expressed by our premotor neurons; (4) Immunocytochemistry for glutamate and GABA will be utilized to determined location and organization of glutaminergic and GABAergic neurons constituting and projecting to the central pattern generator; (5) Immunocytochemistry for NMDAR1 and GABAA alpha1 receptor subunit proteins will be utilized to investigate colocalization of the receptors on buccopharyngeal and esophageal premotor neurons (triple labeling method). Since alterations in excitatory and inhibitory synaptic function could contribute to the pathogenesis of swallowing disorders, these studies may have a direct bearing on the future clinical management of patients with dysphagia.

Agency
National Institute of Health (NIH)
Institute
National Institute on Deafness and Other Communication Disorders (NIDCD)
Type
Research Project (R01)
Project #
1R01DC004098-01
Application #
2861940
Study Section
General Medicine A Subcommittee 2 (GMA)
Project Start
1999-04-01
Project End
2003-03-31
Budget Start
1999-04-01
Budget End
2000-03-31
Support Year
1
Fiscal Year
1999
Total Cost
Indirect Cost
Name
Children's Hospital of Philadelphia
Department
Type
DUNS #
073757627
City
Philadelphia
State
PA
Country
United States
Zip Code
19104