Petrosal ganglion responses to acetylcholine and ATP are enhanced by chronic normobaric hypoxia in the rabbit
| Autor: | Jorge Arroyo, Valentina P. Dedios, Claudia V. Dominguez, Julio Alcayaga, Gabriel Icekson |
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| Rok vydání: | 2013 |
| Předmět: |
Male
Pulmonary and Respiratory Medicine medicine.medical_specialty Time Factors Chemoreceptor Sensory Receptor Cells Physiology Action Potentials Sensory system Biology Adenosine Triphosphate Internal medicine medicine Animals Hypoxia Receptor Glossopharyngeal Nerve Analysis of Variance Normobaric hypoxia Dose-Response Relationship Drug General Neuroscience Body Weight Hypoxia (medical) Acetylcholine Ganglion medicine.anatomical_structure Endocrinology Carotid body Rabbits medicine.symptom medicine.drug |
| Zdroj: | Respiratory Physiology & Neurobiology. 189:624-631 |
| ISSN: | 1569-9048 |
| DOI: | 10.1016/j.resp.2013.07.023 |
| Popis: | In mammals, adaptation to chronic hypoxia requires the integrity of the arterial chemoreceptors, specially the carotid body (CB). Chronic hypoxia increases the sensibility of the CB by acting on the receptor cells, but there is limited information on the effects of chronic hypoxia on the sensory neurons that innervate the CB. Therefore, we studied the responses evoked by ACh and ATP, the main transmitters that generate the chemoafferent activity, on the petrosal ganglion (PG) of rabbits exposed to chronic normobaric hypoxia (CNH) during fourteen days. ATP and ACh increased the activity of PG neurons in a dose-dependent manner, in a similar way than in rabbits not exposed to hypoxia (naïve). However, the duration of the responses were significantly increased by CNH, with the mean maximal responses to ACh and ATP increased by a factor of two and four, respectively. Our results suggest that CNH increases duration of the responses by modifying the expression and/or content of ACh and ATP receptors. |
| Databáze: | OpenAIRE |
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