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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Crestani, Carlos C. Busnardo, Cristiane Tavares, Rodrigo F. Alves, Fernando H. F. Correa, Fernando M. A. |
| Description | Country affiliation: Brazil Author Affiliation: Crestani CC ( Department of Pharmacology, School of Medicine of Ribeirão Preto, University of São Paulo, Av. Bandeirantes 3900, Ribeirão Preto, São Paulo 14049-900, Brazil.) |
| Abstract | Microinjection of noradrenaline into the bed nucleus of the stria terminalis (BST) has been reported to cause a pressor response in unanesthetized rats, which was shown to be mediated by acute vasopressin release into the systemic circulation. In the present study we verified the involvement of magnocellular neurons of the hypothalamic paraventricular (PVN) or supraoptic (SON) nuclei and the local neurotransmitter involved in the pressor response to noradrenaline microinjection into the BST. The PVN pretreatment with the non-selective neurotransmission blocker CoCl2 (1 nmol/100 nL) inhibited the noradrenaline-evoked pressor response. However, responses were not affected by SON treatment with CoCl2. Further experiments were carried out to test if glutamatergic neurotransmission in the PVN mediates the pressor response evoked by noradrenaline microinjection into the BST. Pretreatment of the PVN with the selective N-methyl-d-aspartate (NMDA) receptor antagonist LY235959 (2 nmol/100 nL) did not affect the noradrenaline-evoked pressor response. However, PVN pretreatment with the selective non-NMDA receptor antagonist NBQX (2 nmol/100 nL) significantly reduced the pressor response to noradrenaline microinjection into the BST. In conclusion, our results suggest that pressor responses to noradrenaline microinjection into the BST are mediated by PVN magnocellular neurons without involvement of SON neurons. They also suggest that a glutamatergic neurotransmission through non-NMDA glutamate receptors in the PVN mediates the response. |
| File Format | HTM / HTML |
| ISSN | 0953816X |
| Issue Number | 11 |
| Volume Number | 29 |
| e-ISSN | 14609568 |
| Journal | European Journal of Neuroscience |
| Language | English |
| Publisher | Wiley-Blackwell |
| Publisher Date | 2009-06-01 |
| Publisher Place | France |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Neuroscience Norepinephrine Administration & Dosage Paraventricular Hypothalamic Nucleus Physiology Pressoreceptors Receptors, Amino Acid Septal Nuclei Wakefulness Animals Aspartic Acid Male Microinjections Drug Effects Rats Rats, Wistar Receptors, N-methyl-d-aspartate Comparative Study Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Neuroscience |
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