Chronic control of high blood pressure in the spontaneously hypertensive rat by delivery of angiotensin type 1 receptor antisense.
AUTOR(ES)
Iyer, S N
RESUMO
The renin-angiotensin system plays a crucial role in the development and establishment of the hypertensive state in the spontaneously hypertensive (SH) rat. Interruption of this system's activity by pharmacological means results in the lowering of blood pressure (BP) and control of hypertension. However, such means are temporary and require the continuous use of drugs for the control of this pathophysiological state. Our objective in this investigation was to determine if a virally mediated gene-transfer approach using angiotensin type 1 receptor antisense (AT1R-AS) could be used to control hypertension on a long-term basis in the SH rat model of human essential hypertension. Injection of viral particles containing AT1R-AS (LNSV-AT1R-AS) in 5-day-old rats resulted in a lowering of BP exclusively in the SH rat and not in the Wistar Kyoto normotensive control. A maximal anti-hypertensive response of 33 +/- 5 mmHg was observed, was maintained throughout development, and still persisted 3 months after administration of LNSV-AT1R-AS. The lowering of BP was associated with the expression of AT1R-AS transcript and decreases in AT1-receptor in many peripheral angiotensin II target tissues such as mesenteric artery, adrenal gland, heart, and kidney. Attenuation of angiotensin II-stimulated physiological actions such as contraction of aortic rings and increase in BP was also observed in the LNSV-AT1R-AS-treated SH rat. These observations show that a single injection of LNSV-AT1R-AS normalizes BP in the SH rat on a long-term basis. They suggest that such a gene-transfer strategy can be successfully used to control the development of hypertension on a permanent basis.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=38537Documentos Relacionados
- Delivery of angiotensin II type 1 receptor antisense inhibits angiotensin action in neurons from hypertensive rat brain.
- Direct gene delivery of human tissue kallikrein reduces blood pressure in spontaneously hypertensive rats.
- Regulation of blood pressure by the type 1A angiotensin II receptor gene.
- Cosegregation of the renin allele of the spontaneously hypertensive rat with an increase in blood pressure.
- A gene differentially expressed in the kidney of the spontaneously hypertensive rat cosegregates with increased blood pressure.