Acute administration of 8-hydroxy-2-(di-n-propylamino) tetralin (8-OH-DPAT), a selective 5-HT-receptor agonist, causes a biphasic blood pressure response and a bradycardia in the normotensive Sprague-Dawley rat and in the spontaneously hypertensive rat

1985 ◽  
Vol 62 (3-4) ◽  
pp. 305-319 ◽  
Author(s):  
K. Gradin ◽  
A. Pettersson ◽  
T. Hedner ◽  
B. Persson
Keyword(s):  
Blood Pressure ◽  
Receptor Agonist ◽  
Spontaneously Hypertensive Rat ◽  
Blood Pressure Response ◽  
Pressure Response ◽  
Acute Administration ◽  
Sprague Dawley ◽  
Spontaneously Hypertensive ◽  
Hypertensive Rat ◽  
Sprague Dawley Rat

Blood pressure responsiveness during the development of hypertension in the conscious spontaneously hypertensive rat

1985 ◽  
Vol 63 (10) ◽  
pp. 1258-1262 ◽  
Author(s):  
Corey B. Toal ◽  
Frans H. H. Leenen
Keyword(s):  
Blood Pressure ◽  
Angiotensin Ii ◽  
Spontaneously Hypertensive Rat ◽  
Blood Pressure Response ◽  
Receptor Occupancy ◽  
Pressure Response ◽  
Spontaneously Hypertensive ◽  
Wky Rats ◽  
Freely Moving ◽  
Wistar Kyoto

Blood pressure responsiveness to iv noradrenaline and angiotensin II was studied in conscious, freely moving, age-matched spontaneously hypertensive (SHR) and Wistar-Kyoto (WKY) rats from 4 to 16 weeks of age. At 4 and 6 weeks the SHR showed small, but nonsignificant increases in responsiveness compared with WKY to both noradrenaline and angiotensin II. At 8 weeks they exhibited similar responses to the WKY. Subsequently, at 12 and 16 weeks decreased responsiveness to noradrenaline (nonsignificant) and angiotensin II (p < 0.05 at 12 and 16 weeks) was observed in SHR versus WKY. At 16 weeks of age, hexamethonium caused potentiation of the blood pressure response to noradrenaline and angiotensin II, but to the same degree in the two strains. Captopril at this age did not elicit potentiation to noradrenaline or angiotensin II in either strain. These results indicate that there is no rise in blood pressure responsiveness to circulating pressor agents, parallel to the development of hypertension in SHR. Increased receptor occupancy or more active attenuating reflexes in SHR versus WKY appear not to be involved in the absence of hyperresponsiveness in intact consious SHR at 16 weeks of age.

Hypoxic moderation of systemic hypertension in the spontaneously hypertensive rat

1987 ◽  
Vol 252 (3) ◽  
pp. R554-R561 ◽  
Author(s):  
W. N. Henley ◽  
A. Tucker
Keyword(s):  
Blood Pressure ◽  
Spontaneously Hypertensive Rat ◽  
Metabolic Adaptation ◽  
Systemic Hypertension ◽  
Thyroid Status ◽  
Blood Pressure Elevation ◽  
Spontaneously Hypertensive ◽  
Moderate Hypobaric Hypoxia ◽  
Hypertensive Rat ◽  
Wistar Kyoto

The mechanism by which chronic, moderate, hypobaric hypoxia attenuates systemic systolic blood pressure (SBP) in the spontaneously hypertensive rat (SHR) was investigated in a three-part study. In experiment 1, 10 wk of hypoxia (3,658 m altitude) commencing in 7-wk-old rats was partially effective in preventing the rise in SBP [hypoxic SHR (SHR-H) 154 mmHg vs. normoxic SHR (SHR-N) 180 mmHg; P less than 0.01]. When hypoxia was initiated in 5-wk-old SHR (experiments 2 and 3), protection against hypertension was nearly complete (experiment 2: SHR-H 122 mmHg vs. SHR-N 175 mmHg; P less than 0.001; experiment 3: 135 vs. 152 mmHg, respectively; P less than 0.05). Elevations in O2 consumption (VO2) and rectal temperature (Tre) in SHR vs. normotensive [Wistar-Kyoto (WKY)] rats provided evidence that the SHR is a hypermetabolic animal. Thyroid hormonal indices suggested that SHR changed from a low to high thyroid status at a time that rapid blood pressure elevation occurred; however, hypoxia did not influence thyroid status. Acute, significant decrements in VO2 and Tre in SHR-H (experiments 2 and 3) accompanied the attenuation of SBP by hypoxia, whereas large decrements in VO2 and SBP did not occur in hypoxic WKY. Timely administration of moderate hypoxia protects against the development of hypertension in the SHR. This protection may relate to a metabolic adaptation made by the hypoxic SHR.

scholarly journals Difference on blood pressure response of spontaneously hypertensive and normotensive rats-(1)-

1967 ◽  
Vol 63 (6) ◽  
pp. 472-486 ◽  
Author(s):  
Riitiro IWAKI ◽  
Yoshitaka KUDO ◽  
Juniti ISIKO ◽  
Tsutomu IRIKURA
Keyword(s):  
Blood Pressure ◽  
Blood Pressure Response ◽  
Pressure Response ◽  
Spontaneously Hypertensive

Sodium–Proton (Na+/H+) Exchange Inhibition Increases Blood Pressure in Spontaneously Hypertensive Rat

1994 ◽  
Vol 308 (3) ◽  
pp. 145-151 ◽  
Author(s):  
Yiu-Fai Chen ◽  
Ren-Hui Yang ◽  
Qing-Cheng Meng ◽  
Edward J. Cragoe ◽  
Suzanne Oparil
Keyword(s):  
Blood Pressure ◽  
Spontaneously Hypertensive Rat ◽  
Spontaneously Hypertensive ◽  
Hypertensive Rat
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