Browsing by Subject "Captopril"

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    Effect of the arterial hypertension and captopril treatment on the angiotensin II content in the subfornical organ. A study in SHR rats
    (Murcia : F. Hernández, 2005) Carmona-Calero, E.; Pérez-González, H.; Martínez de la Peña y Valenzuela, Isabel; Gonzalez-Marrero, I.; Perez-Garcia, C.G.; Marrero-Gordillo, N.; Ormazabal-Ramos, C.; Castañeyra Perdomo, A.; Ferres Torres, R.
    We studied the effects of spontaneous high blood pressure and the captopril treatment on the subfornical organ (SFO) of rats. The brains of control Wistar-Kyoto rats (WKY), WKY rats treated with captopril (WKY-T), spontaneously hypertensive rats (SHR) and SHR rats treated with captopril (SHR-T) were processed immunohistochemically using antiangiotensin II as primary antibody. Immunorective material (IRM) for angiotensin II was observed in a group of neurons and some cells of the ependymal layer of the SFO in WKY rats. The angiotensin II immunoreactive (AGII-ir) in the SHR rats was decreased, showing positive reaction only in a few neurons, while captopril treatment induced an increase in immunoreactive material in hypertensive rats, but contrarily, the expression of AGII-ir in the WKY-T group was scarce. The variations of the angiotensin II observed in the SFO could be owing to an interaction between the hypertension and its captopril treatment.
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    Effects of captopril on the development of rat doxorubicin nephropathy
    (Murcia : F. Hernández, 1992) Squadrito, F.; Macchiarelli, C.; Santoro, G.; Arcoraci, V.; Trimarchi, G.R.; Sturniolo, R.; Nottola, S.A.; Motta, P.M.; Caputi, A.P.
    The effects of a daily administration of an anti-converting enzyme inhibitor, Captopril (CPT) (100 mg/kg/orally), on the development of functional and morphological alterations induced in rats by a single injection (7.5 mg/kg/iv) of Doxorubicin (DXR) (Adnamycin*), were investigated. Twenty-four-hour protein excretion, urine output, food intake, water intake, and body weight gain were measured weekly for 30 days. Transmission and scanning electron microscopy observations were performed on kidney samples after 30 days. Four groups were studied. Group 1 were control rats. Group 2 were rats injected with DXR. Group 3 were rats injected with DXR and treated with CPT for 30 days. Group 4 were rats injected with DXR and treated with CPT for 15 days (CPT treatment started 15 days after DXR injection). Group 1 did not show significant functional or morphological changes. Group 2 showed severe proteinuria, significant increase in urinary volume within 2 weeks, significant body weight reduction and diffuse morphological changes. These changes mainly consisted of podocyte swelling, severe foot process fusion, and presence of casts within tubular lumen. Group 3, with respect to group 2, showed a significant reduction of the 24 h protein excretion and urine output. This group displayed morphological changes similar to those observed in group 2, but with a focal distribution. Group 4 showed functional and morphological changes comparable with those of group 2. It is concluded that CPT partially inhibits the development of the functional and morphological damage induced by DXR in the rat kidney. However, CPT did not influence the natural development of nephropathy when treatment started 15 days after DXR injection.
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    The effects of chronic administration of captopril on the mouse median eminence
    (Murcia : F. Hernández, 1998) Castañeyra Perdomo, A.; Carmona-Calero, E.; Pérez-Delgado, M. del M.; Pérez-González, H.; Marrero-Gordillo, N.; Ferres Torres, R.
    The effects of Captopril (an angiotensinconverting enzyme inhibitor) on the median eminence (ME) of the male albino mouse have been examined using morphometric and immunohistochemical procedures. We measured the nuclear area of the ependymocytes of the ME and of the glial cells of the reticular external zone of the ME. We also determined the cell/neuropil coefficient (CNC), which expreses the relation between cellular area and neuropil of the ME, and the global volume of the ME in each animal. For the immunohistochemical study we used rabbit antiarginine- vasopressin, and compared the results in the different groups of mice. We detected an increase in the immunoreactive material (arginine-vasopressin, A-V) and an increase in the global volume of the organ and also an increase of the neuropil of the ME after the longest exposure to the drug. These alterations could be related to the inhibition of the brain angiotensin 11 by captopril and the accumulation of vasopressin in the fibrous tract that runs from the paraventricular nucleus (PVN) to the neurohypophysis.