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Abstract:

Mineralocorticoid effects in the brain include the control of cardiovascular functions, induction of salt appetite, interaction with the vasoactive neuropeptides arginine vasopressin (AVP) and angiotensin II and development or aggravation of hypertension. In this regard, mineralocorticoids may play a pathogenic role in rats with a genetic form of hypertension (spontaneously hypertensive rats, SHR). Our objective was to compare the response of the hypothalamic vasopressinergic system to mineralocorticoid administration in SHR and control Wistar-Kyoto (WKY) rats. Sixteen-week-old male SHR showing a systolic blood pressure of 190 ± 5 mm Hg and normotensive WKY rats (130 ± 5 mm Hg) were treated subcutaneously with oil vehicle or a single 10-mg dose of deoxycorticosterone acetate (DOCA). After 2 h, rats were sacrificed and brains prepared for immunocytochemistry of Fos and vasopressin V1a receptor (V1aR) and for non-isotopic in situ hybridization of AVP mRNA. In the basal state, SHR demonstrated a higher number of AVP mRNA- and V1aR-immunopositive cells in the magno-cellular division of the paraventricular hypothalamic nucleus (PVN) than WKY rats. After DOCA injection, SHR responded with a significant increase in both parameters with respect to vehicle-injected SHR. In WKY rats, DOCA was without effect on AVP mRNA although it increased the number of V1aR-positive cells. Changes in the number of Fos-positive nuclei were measured in the PVN, median preoptic nucleus (MnPO) and organum vasculosum of the lamina terminalis (OVLT), a circumventricular region showing anatomical connections with the PVN. In vehicle-injected rats, the PVN of SHR showed a higher number of Fos-positive nuclei than in WKY rats, whereas after DOCA treatment, a significant increment occurred in the OVLT but not in the PVN or MnPO of the SHR group only. These data suggest that the enhanced response of the vasopressinergic system to mineralocorticoids may contribute to the abnormal blood pressure of SHR. Copyright © 2004 S. Karger AG, Basel.

Registro:

Documento: Artículo
Título:Mineralocorticoid treatment upregulates the hypothalamic vasopressinergic system of spontaneously hypertensive rats
Autor:Pietranera, L.; Saravia, F.; Roig, P.; Lima, A.; De Nicola, A.F.
Filiación:Lab. of Neuroendocrine Biochemistry, Inst. de Biol. Y Med. Experimental, University of Buenos Aires, Buenos Aires, Argentina
Department of Biochemistry, Faculty of Medicine, University of Buenos Aires, Buenos Aires, Argentina
Inst. Univ. de Ciencias de la Salud, Fundación Barceló, Buenos Aires, Argentina
Inst. de Biol. Y Med. Experimental, Obligado 2490, 1428 Buenos Aires, Argentina
Palabras clave:Adrenal steroids; Fos; Hypertension; Organum vasculosum laminae terminalis; Paraventricular nucleus; Preoptic nucleus; Vasopressin; Vasopressin receptor; deoxycorticosterone acetate; mineralocorticoid; protein fos; vasopressin; vasopressin V1 receptor; animal cell; animal experiment; animal model; anterior hypothalamus; article; basement membrane; cell count; controlled study; dose response; drug dose regimen; essential hypertension; hypothalamus hypophysis system; immunocytochemistry; in situ hybridization; male; nonhuman; preoptic nucleus; priority journal; rat; rat strain; spontaneously hypertensive rat; systolic blood pressure; upregulation; Animals; Arginine Vasopressin; Desoxycorticosterone; Disease Models, Animal; Hypertension; Hypothalamus; Immunohistochemistry; In Situ Hybridization; Male; Mineralocorticoids; Oncogene Proteins v-fos; Rats; Rats, Inbred SHR; Rats, Inbred WKY; Receptors, Vasopressin; RNA, Messenger; Vasopressins
Año:2004
Volumen:80
Número:2
Página de inicio:100
Página de fin:110
DOI: http://dx.doi.org/10.1159/000081314
Título revista:Neuroendocrinology
Título revista abreviado:Neuroendocrinology
ISSN:00283835
CODEN:NUNDA
CAS:deoxycorticosterone acetate, 56-47-3; vasopressin, 11000-17-2; Arginine Vasopressin, 113-79-1; Desoxycorticosterone, 64-85-7; Mineralocorticoids; Oncogene Proteins v-fos; Receptors, Vasopressin; RNA, Messenger; Vasopressins, 11000-17-2
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00283835_v80_n2_p100_Pietranera

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Citas:

---------- APA ----------
Pietranera, L., Saravia, F., Roig, P., Lima, A. & De Nicola, A.F. (2004) . Mineralocorticoid treatment upregulates the hypothalamic vasopressinergic system of spontaneously hypertensive rats. Neuroendocrinology, 80(2), 100-110.
http://dx.doi.org/10.1159/000081314
---------- CHICAGO ----------
Pietranera, L., Saravia, F., Roig, P., Lima, A., De Nicola, A.F. "Mineralocorticoid treatment upregulates the hypothalamic vasopressinergic system of spontaneously hypertensive rats" . Neuroendocrinology 80, no. 2 (2004) : 100-110.
http://dx.doi.org/10.1159/000081314
---------- MLA ----------
Pietranera, L., Saravia, F., Roig, P., Lima, A., De Nicola, A.F. "Mineralocorticoid treatment upregulates the hypothalamic vasopressinergic system of spontaneously hypertensive rats" . Neuroendocrinology, vol. 80, no. 2, 2004, pp. 100-110.
http://dx.doi.org/10.1159/000081314
---------- VANCOUVER ----------
Pietranera, L., Saravia, F., Roig, P., Lima, A., De Nicola, A.F. Mineralocorticoid treatment upregulates the hypothalamic vasopressinergic system of spontaneously hypertensive rats. Neuroendocrinology. 2004;80(2):100-110.
http://dx.doi.org/10.1159/000081314