Efectos de las infusiones sistémicas de angiotensina II sobre la rama ascendente gruesa del Asa de Henle
Increases in the Renin-Angiotensin system contribute to the development of salt-sensitive hypertension (SSH). This condition affects 50% of hypertensive patients. The pharmacological strategies aimed at decreasing blood pressure by reducing the synthesis of Ang II or by blocking its specific recepto...
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| Formato: | Tesis doctoral acceptedVersion |
| Lenguaje: | Español |
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Facultad de Farmacia y Bioquímica
2018
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| Acceso en línea: | http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=posgraafa&cl=CL1&d=HWA_2394 http://repositoriouba.sisbi.uba.ar/gsdl/collect/posgraafa/index/assoc/HWA_2394.dir/2394.PDF |
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I28-R145-HWA_23942020-02-27 Increases in the Renin-Angiotensin system contribute to the development of salt-sensitive hypertension (SSH). This condition affects 50% of hypertensive patients. The pharmacological strategies aimed at decreasing blood pressure by reducing the synthesis of Ang II or by blocking its specific receptor AT1 are less effective in these patients, so are commonly combined with a diuretic. This suggests that patients with SSH have an increased renal reabsorption of sodium and fluids. The thick ascending limb (TAL) of the loop of Henle reabsorbs -30% of the sodium filtered through the glomerulus, and is crucial in the generation of the osmotic gradient necessary for water reabsorption by collecting ducts. Epidemiological and animal studies suggest that the TAL participates in the development of SSH. The results obtained in this thesis shows that 1-week infusion of Ang II raises the activity of the Na+/K+-ATPase in the TAL. In addition, Ang II decreases the production of the NO in response to natriuretic stimuli. In conclusion, during Ang II-induced hypertension, the net transport of Na+ in the TAL is increased, possibly by a reduction in the NO-signaling pathway. These changes can reduce the excretion of Na+ and contribute to the sensitivity of blood pressure to salt intake. Fil: González Vicente, Agustín. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Buenos Aires, Argentina Dominici, Fernando P. Facultad de Farmacia y Bioquímica Garvin, Jeffrey L. González Vicente, Agustín 2018-04-26 El aumento de actividad del sistema renina-angiotensina, contribuye al desarrollo de hipertensión sensible a la sal (HTA-SS), que afecta al 50% de los pacientes hipertensos. Los fármacospara controlar la presión arterial (PA) que disminuyen la síntesis de Ang II o bloquean su receptor específico AT1 son menos efectivos en pacientes con HTA-SS por lo que comúnmente se combinan con un diurético. Esto sugiere la HTA-SS transcurre con una reabsorción renal de sodio y fluidos aumentada. La rama ascendente gruesa (RAG) del Asa de Henle reabsorbe -30% del sodio filtrado en el glomérulo, y es fundamental en la generación del gradiente osmótico necesario para reabsorber agua en el túbulo colector. Estudios epidemiológicos y en animales indican que la RAG contribuye a la HTA-SS. Los resultados obtenidos en esta Tesis Doctoral muestran que la infusión de Ang II durante una semana eleva la actividad de la Na+/K+-ATPasa en la RAG. Además, la Ang II disminuye la capacidad de producción NO en respuesta a estímulos natriuréticos. En conclusión, se ha demostrado que durante la hipertensión inducida por Ang II, el transporte neto de Na+ en la RAG se encuentra aumentado, posiblemente por la disminución de la vía de señalización del NO. Estos cambios pueden dificultar la excreción de Na+ y contribuir a la HTA-SS. application/pdf Carreras, Cecilia Toblli, Jorge Orias, Marcelo Hipertensión Renovascular Riñón Sensibilidad a la sal Natriuresis spa Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ Ciencia de la vida Efectos de las infusiones sistémicas de angiotensina II sobre la rama ascendente gruesa del Asa de Henle info:eu-repo/semantics/doctoralThesis info:ar-repo/semantics/tesis doctoral info:eu-repo/semantics/acceptedVersion http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=posgraafa&cl=CL1&d=HWA_2394 http://repositoriouba.sisbi.uba.ar/gsdl/collect/posgraafa/index/assoc/HWA_2394.dir/2394.PDF |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-145 |
| collection |
Repositorio Digital de la Universidad de Buenos Aires (UBA) |
| language |
Español |
| orig_language_str_mv |
spa |
| topic |
Hipertensión Renovascular Riñón Sensibilidad a la sal Natriuresis Ciencia de la vida |
| spellingShingle |
Hipertensión Renovascular Riñón Sensibilidad a la sal Natriuresis Ciencia de la vida González Vicente, Agustín Efectos de las infusiones sistémicas de angiotensina II sobre la rama ascendente gruesa del Asa de Henle |
| topic_facet |
Hipertensión Renovascular Riñón Sensibilidad a la sal Natriuresis Ciencia de la vida |
| description |
Increases in the Renin-Angiotensin system contribute to the development of salt-sensitive hypertension (SSH). This condition affects 50% of hypertensive patients. The pharmacological strategies aimed at decreasing blood pressure by reducing the synthesis of Ang II or by blocking its specific receptor AT1 are less effective in these patients, so are commonly combined with a diuretic. This suggests that patients with SSH have an increased renal reabsorption of sodium and fluids. The thick ascending limb (TAL) of the loop of Henle reabsorbs -30% of the sodium filtered through the glomerulus, and is crucial in the generation of the osmotic gradient necessary for water reabsorption by collecting ducts. Epidemiological and animal studies suggest that the TAL participates in the development of SSH. The results obtained in this thesis shows that 1-week infusion of Ang II raises the activity of the Na+/K+-ATPase in the TAL. In addition, Ang II decreases the production of the NO in response to natriuretic stimuli. In conclusion, during Ang II-induced hypertension, the net transport of Na+ in the TAL is increased, possibly by a reduction in the NO-signaling pathway. These changes can reduce the excretion of Na+ and contribute to the sensitivity of blood pressure to salt intake. |
| author2 |
Dominici, Fernando P. |
| author_facet |
Dominici, Fernando P. González Vicente, Agustín |
| format |
Tesis doctoral Tesis doctoral acceptedVersion |
| author |
González Vicente, Agustín |
| author_sort |
González Vicente, Agustín |
| title |
Efectos de las infusiones sistémicas de angiotensina II sobre la rama ascendente gruesa del Asa de Henle |
| title_short |
Efectos de las infusiones sistémicas de angiotensina II sobre la rama ascendente gruesa del Asa de Henle |
| title_full |
Efectos de las infusiones sistémicas de angiotensina II sobre la rama ascendente gruesa del Asa de Henle |
| title_fullStr |
Efectos de las infusiones sistémicas de angiotensina II sobre la rama ascendente gruesa del Asa de Henle |
| title_full_unstemmed |
Efectos de las infusiones sistémicas de angiotensina II sobre la rama ascendente gruesa del Asa de Henle |
| title_sort |
efectos de las infusiones sistémicas de angiotensina ii sobre la rama ascendente gruesa del asa de henle |
| publisher |
Facultad de Farmacia y Bioquímica |
| publishDate |
2018 |
| url |
http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=posgraafa&cl=CL1&d=HWA_2394 http://repositoriouba.sisbi.uba.ar/gsdl/collect/posgraafa/index/assoc/HWA_2394.dir/2394.PDF |
| work_keys_str_mv |
AT gonzalezvicenteagustin efectosdelasinfusionessistemicasdeangiotensinaiisobrelaramaascendentegruesadelasadehenle |
| _version_ |
1766017502445305856 |