4 research outputs found
Interacción entre angiotensina II, óxido nÃtrico y prostaglandinas en el control de la función renal / Tesis doctoral dirigida por Francisco Javier Salazar Aparicio.
Tesis-Universidad de Murcia.Consulte la tesis en: BCA. GENERAL. ARCHIVO UNIVERSITARIO. D-500.Consulte la tesis en: BCA. GENERAL. ARCHIVO UNIVERSITARIO. T.M.-1484
Importancia de la ciclooxygenasa-2 en el control de la función renal / Francisca RodrÃguez Mulero ; Directores: F. Javier Salazar Aparicio, MarÃa Teresa Llinás Más.
Tesis - Universidad de Murcia.MEDICINA ESPINARDO. DEPOSITO. MU-Tesis 581.Consulte la tesis en: BCA. GENERAL. ARCHIVO UNIVERSITARIO. T.M.-1794
Cardiac, renal and uterine hemodynamics changes throughout pregnancy in rats with a prolonged high fat diet from an early age.
Objective: To examine whether the cardiac, renal and uterine physiological hemodynamic
changes during gestation are altered in rats with an early and prolonged exposure to a high fat
diet (HFD).
Methods: Arterial pressure and cardiac, renal, uterine and radial arteries hemodynamic
changes during gestation were examined in adult SD rats exposed to normal (13%) (n=8) or
high (60%) (n=8) fat diets from weaning. Plethysmography, high-resolution high-frequency
ultrasonography and clearance of an inulin analog were used to evaluate the arterial pressure
and hemodynamic changes before and at days 7, 14 and 19 of gestation.
Results: Arterial pressure was higher (P<0.05) in rats with high than in those with normal
(NFD) fat diet before pregnancy (123 ±3 and 110 ±3 mmHg, respectively) and only decreased
at day 14 of gestation in rats with NFD (98±4 mmHg, P<0.05). A significant increment in
stroke volume (42 ±10%) and cardiac output (51 ±12%) was found at day 19 of pregnancy in
rats with NFD. The changes in stroke volume and cardiac output were similar in rats with
NFD and HFD. When compared to the values obtained before pregnancy, a transitory
elevation in renal blood flow was found at day 14 of pregnancy in both groups. However,
glomerular filtration rate only increased (P<0.05) in rats with NFD at days 14 (20 ±7%) and
19 (27 ±8%) of gestation. The significant elevations of mean velocity, and velocity time
integral throughout gestation in radial (127 ±26% and 111 ±23%, respectively) and uterine
(91 ±16% and 111 ±25%, respectively) arteries of rats with NFD were not found in rats with
an early and prolonged HFD.
Summary: This study reports novel findings showing that the early and prolonged exposure to
a HFD leads to a significant impairment in the renal, uterine and radial arteries hemodynamic
changes associated to gestation
Trophoblast induced spiral remodelling and uteroplacental haemodynamics in hypertensive pregnant rats with reduced heme oxygenase activity.
Introduction
The aim of the present study was to determine the contribution of the heme oxygenase (HO) system to the adaptation of the uteroplacental circulation to pregnancy in the rat, and its relationship with the maintenance of blood pressure during late gestation.
Methods
The HO inhibitor, stannous mesoporphyrin (SnMP), or vehicle were administered intraperitoneally to virgin and midpregnant rats. Mean arterial pressure (MAP) was measured before and after the treatment, in the conscious rats. Uterine and radial arteries blood flow velocities were obtained from pregnant rats at days 14 and 19 of gestation using high frequency ultrasonography. Trophoblast invasion and spiral arteries remodelling were analyzed in the mesometrial triangle of pregnant rats by inmunohistochemistry.
Results
HO activity inhibition during late gestation induced a significantly increase in the MAP of pregnant rats (114±1 mmHg vs 100±2 mmHg, p<0.05) but it did not affect this parameter in virgin rats (121±2 mmHg vs 124±3 mmHg). MAP elevation was associated with marked (p<0.05) decreases in the systolic and diastolic flow velocities in uterine and radial arteries, as compared with pregnant control rats. Furthermore, spiral arteries of pregnant rats treated with SnMP showed lower (p<0.001) proportion of lumen circumference covered by trophoblast (21±3%) and a higher (p<0.05) proportion of vascular smooth muscle (33±5%) than control pregnant rats (59±5% and 16±5%, respectively)
Discussion
These data indicate that HO system play an important role in the adaptation of the uteroplacental circulation to pregnancy and in the blood pressure regulation during late gestation