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Effect of electrolytic lesion of the dorsal raphe nucleus on water intake and sodium appetite BJMBR
Olivares,E.L.; Costa-e-Sousa,R.H.; Cavalcante-Lima,H.R.; Lima,H.R.C.; Cedraz-Mercez,P.L.; Reis,L.C..
The present study determined the effect of an electrolytic lesion of the dorsal raphe nucleus (DRN) on water intake and sodium appetite. Male Wistar rats weighing 290-320 g with a lesion of the DRN (L-DRN), performed two days before experiments and confirmed by histology at the end of the experiments, presented increased sensitivity to the dehydration induced by fluid deprivation. The cumulative water intake of L-DRN rats reached 23.3 ± 1.9 ml (a 79% increase, N = 9) while sham-lesioned rats (SL-DRN) did not exceed 13.0 ± 1.0 ml (N = 11, P < 0.0001) after 5 h. The L-DRN rats treated with isoproterenol (300 µg kg-1 ml-1, sc) exhibited an increase in water intake that persisted throughout the experimental period (L-DRN, 15.7 ± 1.47 ml, N = 9 vs SL-DRN,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sodium appetite; Water intake; Dorsal raphe nucleus; Serotonergic system; Electrolytic lesion; Rats.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003001200013
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Chronic excitotoxic lesion of the dorsal raphe nucleus induces sodium appetite BJMBR
Cavalcante-Lima,H.R.; Badauê-Passos Jr.,D.; de-Lucca Jr.,W.; Lima,H.R.C.; Costa-e-Sousa,R.H.; Olivares,E.L.; Cedraz-Mercez,P.L.; Reis,R.O.; Medeiros,M.A.; Côrtes,W.S.; Reis,L.C..
We determined if the dorsal raphe nucleus (DRN) exerts tonic control of basal and stimulated sodium and water intake. Male Wistar rats weighing 300-350 g were microinjected with phosphate buffer (PB-DRN, N = 11) or 1 µg/0.2 µl, in a single dose, ibotenic acid (IBO-DRN, N = 9 to 10) through a guide cannula into the DRN and were observed for 21 days in order to measure basal sodium appetite and water intake and in the following situations: furosemide-induced sodium depletion (20 mg/kg, sc, 24 h before the experiment) and a low dose of dietary captopril (1 mg/g chow). From the 6th day after ibotenic acid injection IBO-DRN rats showed an increase in sodium appetite (12.0 ± 2.3 to 22.3 ± 4.6 ml 0.3 M NaCl intake) whereas PB-DRN did not exceed 2 ml (P <...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sodium appetite; Water intake; Dorsal raphe nucleus; Serotonergic system; Ibotenic acid.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005001100015
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Effects of nitric oxide on magnocellular neurons of the supraoptic nucleus involve multiple mechanisms BJMBR
Silva,M.P. da; Cedraz-Mercez,P.L.; Varanda,W.A..
Physiological evidence indicates that the supraoptic nucleus (SON) is an important region for integrating information related to homeostasis of body fluids. Located bilaterally to the optic chiasm, this nucleus is composed of magnocellular neurosecretory cells (MNCs) responsible for the synthesis and release of vasopressin and oxytocin to the neurohypophysis. At the cellular level, the control of vasopressin and oxytocin release is directly linked to the firing frequency of MNCs. In general, we can say that the excitability of these cells can be controlled via two distinct mechanisms: 1) the intrinsic membrane properties of the MNCs themselves and 2) synaptic input from circumventricular organs that contain osmosensitive neurons. It has also been...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Magnocellular neurons; Supraoptic nucleus; Vasopressin; Oxytocin; Nitric oxide; Homeostasis.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2014000200090
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