Abstract
To investigate whether brain AT1 receptor stimulation contributes as a hypertensive mechanism to deoxycorticosterone acetate (DOCA)-salt hypertension, losartan (1 mg/4μL) or artificial cerebrospinal fluid (aCSF) was injected into the lateral cerebral ventricle in conscious control uninephrectomized Wistar rats or rats with DOCA-salt for 2 or 4 weeks, and mean arterial pressure (MAP) and heart rates (HR) were recorded. In rats with DOCA-salt treatment, resting MAP increased to 144±6 mmHg after 2 weeks and to 170±5 mmHg after 4 weeks versus 115-120 mmHg in controls. In rats with 2 week DOCA-salt treatment, MAP started declining at 4 hr after intracerebroventricular (icv) injection of losartan, and significant decreases in MAP were found at 18 and 24 hr. In rats with 4 week DOCA-salt treatment, MAP was significantly decreased at 4, 18 and 24 hr. In both groups MAP decreased to that of control rats. In control rats, icv losartan had no effect on MAP and HR. Icv aCSF did not significantly change MAP and HR in either DOCA-salt hypertensive rats or control rats. Normalization of MAP after icv administration of the AT1 receptor antagonist suggests a significant role for brain AT1 receptor stimulation in the development and maintenance of hypertension in the DOCA-salt hypertensive rat model.
| Original language | English |
|---|---|
| Pages (from-to) | 553-557 |
| Number of pages | 5 |
| Journal | Journal of Korean Medical Science |
| Volume | 16 |
| Issue number | 5 |
| Publication status | Published - 2001 Oct 1 |
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Keywords
- Angiotensin II
- Brain AT Receptor
- Deoxycorticosterone, Hypertension
- Losartan
ASJC Scopus subject areas
- Medicine(all)
Cite this
Effects of centrally administered losartan on deoxycorticosterone-salt hypertension rats. / Park, Chang Gyu; Leenen, Frans H H.
In: Journal of Korean Medical Science, Vol. 16, No. 5, 01.10.2001, p. 553-557.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of centrally administered losartan on deoxycorticosterone-salt hypertension rats
AU - Park, Chang Gyu
AU - Leenen, Frans H H
PY - 2001/10/1
Y1 - 2001/10/1
N2 - To investigate whether brain AT1 receptor stimulation contributes as a hypertensive mechanism to deoxycorticosterone acetate (DOCA)-salt hypertension, losartan (1 mg/4μL) or artificial cerebrospinal fluid (aCSF) was injected into the lateral cerebral ventricle in conscious control uninephrectomized Wistar rats or rats with DOCA-salt for 2 or 4 weeks, and mean arterial pressure (MAP) and heart rates (HR) were recorded. In rats with DOCA-salt treatment, resting MAP increased to 144±6 mmHg after 2 weeks and to 170±5 mmHg after 4 weeks versus 115-120 mmHg in controls. In rats with 2 week DOCA-salt treatment, MAP started declining at 4 hr after intracerebroventricular (icv) injection of losartan, and significant decreases in MAP were found at 18 and 24 hr. In rats with 4 week DOCA-salt treatment, MAP was significantly decreased at 4, 18 and 24 hr. In both groups MAP decreased to that of control rats. In control rats, icv losartan had no effect on MAP and HR. Icv aCSF did not significantly change MAP and HR in either DOCA-salt hypertensive rats or control rats. Normalization of MAP after icv administration of the AT1 receptor antagonist suggests a significant role for brain AT1 receptor stimulation in the development and maintenance of hypertension in the DOCA-salt hypertensive rat model.
AB - To investigate whether brain AT1 receptor stimulation contributes as a hypertensive mechanism to deoxycorticosterone acetate (DOCA)-salt hypertension, losartan (1 mg/4μL) or artificial cerebrospinal fluid (aCSF) was injected into the lateral cerebral ventricle in conscious control uninephrectomized Wistar rats or rats with DOCA-salt for 2 or 4 weeks, and mean arterial pressure (MAP) and heart rates (HR) were recorded. In rats with DOCA-salt treatment, resting MAP increased to 144±6 mmHg after 2 weeks and to 170±5 mmHg after 4 weeks versus 115-120 mmHg in controls. In rats with 2 week DOCA-salt treatment, MAP started declining at 4 hr after intracerebroventricular (icv) injection of losartan, and significant decreases in MAP were found at 18 and 24 hr. In rats with 4 week DOCA-salt treatment, MAP was significantly decreased at 4, 18 and 24 hr. In both groups MAP decreased to that of control rats. In control rats, icv losartan had no effect on MAP and HR. Icv aCSF did not significantly change MAP and HR in either DOCA-salt hypertensive rats or control rats. Normalization of MAP after icv administration of the AT1 receptor antagonist suggests a significant role for brain AT1 receptor stimulation in the development and maintenance of hypertension in the DOCA-salt hypertensive rat model.
KW - Angiotensin II
KW - Brain AT Receptor
KW - Deoxycorticosterone, Hypertension
KW - Losartan
UR - http://www.scopus.com/inward/record.url?scp=0035486903&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0035486903&partnerID=8YFLogxK
M3 - Article
C2 - 11641522
AN - SCOPUS:0035486903
VL - 16
SP - 553
EP - 557
JO - Journal of Korean Medical Science
JF - Journal of Korean Medical Science
SN - 1011-8934
IS - 5
ER -