Effects of electrical stimulation of ventral septal area on firing rates of pyrogen-treated thermosensitive neurons in preoptic anterior hypothalamus from rabbits
| Autor: | Xin-hua Xie, Da-xiang Lu, Yong-Mei Fu, Jun Dong |
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| Rok vydání: | 2005 |
| Předmět: |
Male
medicine.medical_specialty Vasopressin Interleukin-1beta Action Potentials Stimulation Endogeny Biology General Biochemistry Genetics and Molecular Biology Internal medicine Arginine vasopressin receptor 2 medicine Extracellular Animals General Pharmacology Toxicology and Pharmaceutics Neurons Pyrogens Antagonist General Medicine Thermoregulation Preoptic Area Electric Stimulation Arginine Vasopressin Electrophysiology Endocrinology nervous system Female Septum of Brain Rabbits Microelectrodes Antidiuretic Hormone Receptor Antagonists Body Temperature Regulation |
| Zdroj: | Life sciences. 80(5) |
| ISSN: | 0024-3205 |
| Popis: | Although there is considerable evidence supporting that fever evolved as a host defense response, it is important that the rise in body temperature would not be too high. Many endogenous cryogens or antipyretics that limit the rise in body temperature have been identified. Endogenous antipyretics attenuate fever by influencing the thermoregulatory neurons in the preoptic anterior hypothalamus (POAH) and in adjacent septal areas including ventral septal area (VSA). Our previous study showed that intracerebroventricular (I.C.V.) injection of interleukin-1 β (IL-1 β ) affected electrophysiological activities of thermosensitive neurons in VSA regions, and electrical stimulation of POAH reversed the effect of IL-1 β . To further investigate the functional electrophysiological connection between POAH and VSA and its mechanisms in thermoregulation, the firing rates of thermosensitive neurons in POAH of forty-seven unit discharge were recorded by using extracellular microelectrode technique in New Zealand white rabbits. Our results show that the firing rates of the warm-sensitive neurons decreased significantly and those of the cold-sensitive neurons increased in POAH when the pyrogen (IL-1 β ) was injected I.C.V. The effects of IL-1 β on firing rates in thermosensitive neurons of POAH were reversed by electrical stimulation of VSA. An arginine vasopressin (AVP) V1 antagonist abolished the regulatory effects of VSA on the firing rates in thermosensitive neurons of POAH evoked by IL-1 β . However, an AVP V2 antagonist had no effects. These data indicated that VSA regulates the activities of the thermosensitive neurons of POAH through AVP V1 but not AVP V2 receptor. |
| Databáze: | OpenAIRE |
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