
handle: 10366/19332
Se estudi? el efecto antihipertensivo de la astaxantina, un antioxidante de naturaleza oxicarotenoide, en tres modelos animales de hipertensi?n: ratas espont?neamente hipertensas (SHR), ratones Swiss Albino-CD1 con hipertensi?n inducida mediante la infusi?n de angiotensina II y ratones modificados gen?ticamente para las prote?nas Vav3. Se analiz? el efecto de la astaxantina sobre las alteraciones funcionales y estructurales provocadas por la hipertensi?n en los ?rganos diana y sobre la producci?n de especies reactivas de ox?geno, as? como su relaci?n con los cambios funcionales y estructurales. La administraci?n de astaxantina en las dosis ensayadas fue capaz de disminuir la presi?n arterial en los tres modelos de hipertensi?n utilizados. La hipertrofia cardiaca que caracteriza a estos modelos de hipertensi?n, disminuy? de manera estad?sticamente significativa con la administraci?n de astaxantina, aspecto que adem?s, podr?a asociarse a la reducci?n de la fibrosis. La astaxantina mejor? la funcionalidad vascular en arterias de resistencia pero no en arterias de conductancia. Adem?s redujo de manera significativa, la formaci?n de ani?n super?xido estimulada con NADPH en anillos de aorta procedentes de los tres modelos de hipertensi?n. En las condiciones del estudio, la astaxantina redujo el remodelado en vasos de resistencia y de conductancia de ratas SHR. Mientras que en la hipertensi?n inducida por angiotensina II, la astaxantina redujo el estr?s oxidativo y la fibrosis asociados a este modelo.
The antihypertensive capacity of the astaxanthin, an antioxidant of oxicarotenoid nature, was evaluated in three animal models of hypertension: spontaneously hypertensive rats (SHR), Swiss Albino CD1 mice with hypertension induced by means of the infusion of angiotensin II and mice modified genetically for the Vav3 proteins. We analyzed the effect of the astaxanthin on the functional and structural alterations produced by the hypertension in the target organs and on the production of reactive oxygen species, as well as its relation with the functional and structural changes. The administration of astaxanthin in the tried doses was able to diminish the blood pressure in the three models of hypertension. The cardiac hypertrophy that characterizes to these models of hypertension decreased of statistically significant way with the astaxanthin administration. The reduction of fibrosis could contribute to this process. The astaxanthin improved the vascular functionality in arteries of resistance but not in conductance arteries. In addition it reduced of significant way, the formation of superoxide anion stimulated with NADPH in rings of aorta coming from the three models of hypertension. In the conditions of the study, the astaxanthin reduced the vascular remodeling in both resistance and conductance vessels of SHR. In the hypertension induced by angiotensin II, the astaxanthin reduced the oxidative stress and fibrosis of this model.
Hipertensi?n, Oxidative stress, Astaxantina, Hipertensión, Hypertension, Astaxanthin, Estrés oxidativo, Reactividad vascular, Vascular reactivity, Estr?s oxidativo
Hipertensi?n, Oxidative stress, Astaxantina, Hipertensión, Hypertension, Astaxanthin, Estrés oxidativo, Reactividad vascular, Vascular reactivity, Estr?s oxidativo
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