Pressor, dipsogenic, natriuretic and kaliuretic responses to central carbachol in rats with lesion of the medial septal area

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Cleidionice Luiz, Aparecida [UNESP]
Abrão Saad, Wilson [UNESP]
Antonio de Arruda Camargo, Luiz [UNESP]
Renzi, Antonio [UNESP]
Antonio de Luca Junior, Laurival [UNESP]
Vanderlei Menani, José [UNESP]

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In the present study we investigated the effect of electrolytic lesion of the medial septal area (MSA) on the dipsogenic, natriuretic, kaliuretic and pressor responses elicited by intracerebroventricular (i.c.v.) injection of the cholinergic agonist carbachol. Freely moving rats with sham or MSA lesion (1-7 days and 14-18 days) and a stainless steel cannula implanted into the lateral ventricle were studied. In sham rats, i.c.v. injection of carbachol (7.5 nmol) produced an increase in water intake (10.2 ± 1.5 ml/h), mean arterial pressure (MAP) (35 ± 5 mmHg) and urinary Na+ and K+ excretion (551 ± 83 and 170 ± 17 μEq 120 min, resp.). The pressor (18 ± 3 and 14 ± 4 mmHg, resp.) and natriuretic responses (178 ± 58 and 172 ± 38 μEq 120 min) produced by i.c.v. carbachol in acute or chronic MSA-lesioned rats were reduced. No change was observed in urinary K+ excretion and a reduced water intake (5 ± 1.3 ml/h) was observed only in acute MSA-lesioned rats. These results suggest that the MSA plays an important role for the pressor and natriuretic responses induced by central cholinergic activation in rats. A small influence of this structure on water intake may also be suggested. © 1991.



Arterial pressure, Cholinergic receptor, Fluid balance, Septal area, Sodium excretion, Water intake, carbachol, animal experiment, brain injury, drinking, kaliuresis, male, natriuresis, nonhuman, pressor response, priority journal, rat, septum nucleus, Animal, Blood Pressure, Brain, Carbachol, Drinking, Male, Natriuresis, Potassium, Rats, Rats, Inbred Strains, Septum Pellucidum, Support, Non-U.S. Gov't, Thirst, Urine

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Neuroscience Letters, v. 132, n. 2, p. 195-198, 1991.