Occipital artery injections of 5-HT may directly activate the cell bodies of vagal and glossopharyngeal afferent cell bodies in the rat
| Autor: | Joy R. Owen, Patrick J. Lacolley, Tom P. Robertson, Tristan H. Lewis, Kevin Sandock, Stephen J. Lewis, James N. Bates |
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| Rok vydání: | 2006 |
| Předmět: |
Male
Serotonin Thiazines Blood Pressure Functional Laterality Rats Sprague-Dawley Heart Rate medicine.artery Heart rate Animals Medicine Occipital artery Ligation Glossopharyngeal Nerve Neurons Analysis of Variance Dose-Response Relationship Drug business.industry Drug Administration Routes General Neuroscience Carotid sinus Vagus Nerve Nodose Ganglion Anatomy Rats Ganglion Vagus nerve Methylene Blue medicine.anatomical_structure Injections Intra-Arterial Glossopharyngeal nerve business Blood Flow Velocity |
| Zdroj: | Neuroscience. 143:289-308 |
| ISSN: | 0306-4522 |
| DOI: | 10.1016/j.neuroscience.2006.08.047 |
| Popis: | The primary objective of this study was to determine whether circulating factors gain direct access to and affect the activity of vagal afferent cell bodies in the nodose ganglia and glossopharyngeal afferents cell bodies in the petrosal ganglia, of the rat. We found that the occipital and internal carotid arteries provided the sole blood supply to the nodose ganglia, and that i.v. injections of the tracer, Basic Blue 9, elicited strong cytoplasmic staining in vagal and glossopharyngeal afferent cell bodies that was prevented by prior ligation of the occipital but not the internal carotid arteries. We also found that occipital artery injections of 5-HT elicited pronounced dose-dependent reductions in heart rate and diastolic arterial blood pressure that were (1) virtually abolished after application of the local anesthetic, procaine, to the ipsilateral nodose and petrosal ganglia, (2) markedly attenuated after transection of the ipsilateral vagus between the nodose ganglion and brain and virtually abolished after subsequent transection of the ipsilateral glossopharyngeal nerve between the petrosal ganglion and the brain, (3) augmented after ipsilateral transection of the aortic depressor and carotid sinus nerves, and (4) augmented after transection of all ipsilateral glossopharyngeal and vagal afferent nerves except for vagal cardiopulmonary afferents. These findings suggest that blood-borne 5-HT in the occipital artery gains direct access to and activates the cell bodies of vagal cardiopulmonary afferents of the rat and glossopharyngeal afferents of undetermined modalities. |
| Databáze: | OpenAIRE |
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