scholarly journals Effects of Angiotensin I-Converting Enzyme Inhibitor from Ashitaba (Angelica keiskei) on Blood Pressure of Spontaneously Hypertensive Rats.

1999 ◽  
Vol 45 (3) ◽  
pp. 375-383 ◽  
Author(s):  
Emiko SHIMIZU ◽  
Atsuml HAYASHI ◽  
Rumiko TAKAHASHI ◽  
Yasuo AOYAGI ◽  
Tetsuo MURAKAMI ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Spontaneously Hypertensive Rats ◽  
Enzyme Inhibitor ◽  
Converting Enzyme ◽  
Hypertensive Rats ◽  
Angiotensin I ◽  
Spontaneously Hypertensive ◽  
Converting Enzyme Inhibitor ◽  
Angiotensin I Converting Enzyme ◽  
Angelica Keiskei

The Relationship Between Angiotensin II (ANG II) and Oxidative Stress in the Maintenance of Mean Arterial Pressure (MAP) of Spontaneously Hypertensive Rats.

Hypertension ◽  
2000 ◽  
Vol 36 (suppl_1) ◽  
pp. 686-686
Author(s):  
Rodney J Bolterman ◽  
Clara M Ortiz-Ruiz ◽  
Luis A Juncos ◽  
Jane F Reckelhoff ◽  
Juan C Romero
Keyword(s):  
Oxidative Stress ◽  
Blood Pressure ◽  
Plasma Levels ◽  
Spontaneously Hypertensive Rats ◽  
Enzyme Inhibitor ◽  
Ang Ii ◽  
Converting Enzyme ◽  
Hypertensive Rats ◽  
Spontaneously Hypertensive ◽  
Converting Enzyme Inhibitor

48 Spontaneously hypertensive rats (SHR) reportedly have inappropriately high levels of Ang II despite normal plasma renin activity (PRA). Because Ang II stimulates oxidative stress, which in turn quenches nitric oxide, it is possible that Ang II-induced increases in oxidative stress contribute to the increase in blood pressure. Indeed, administering either a converting enzyme inhibitor (to decrease Ang II) or Tempol (a potent antioxidant) reduces blood pressure in SHR. We tested whether decreasing Ang II with a converting enzyme inhibitor reduces oxidative stress as well as MAP in SHR. For this, we divided 12 weeks old SHR into two groups (n=5 each). One group was treated with captopril (100 mg/kg/day added to the drinking water) and the other served as our untreated time controls. After 16 days of treatment, the rats were anesthetised and we measured MAP and collected blood samples to determine PRA, and the plasma levels of Ang II and thiobarbituric acid-reactive substances (TBARS). The captopril-treated rats had a lower MAP than the untreated rats (92±4 vs. 160±5 mmHg, respectively) and an increased PRA (42±1 vs. 26±6 ng/ml/h; captopril-treated vs. untreated rats, respectively). The decreased MAP in the captopril-treated SHR was accompanied by reduced plasma levels of Ang II (630±47 vs. 836±205 pg/ml) and TBARS (5.4±1.0 vs. 3.0±0.2 nmol/ml). Despite the significant decrease in Ang II levels in the captopril-treated SHR, they are still 20-fold higher rhan in normotensive Sprague-Dawley rats (34.0±8.8 pg/ml). In summary, captopril-induced decreases of MAP in SHR are accompanied not only by reduced levels of Ang II, but also by reduced oxidative stress. Because antioxidants also lower MAP in SHR, it suggests that oxidative stress induced by Ang II may play a role in the pathogenesis of the increased blood pressure in SHR.

Characterization of signaling pathways of Angiotensin I‐Converting Enzyme in mesangial cells of spontaneously hypertensive rats (SHR)

2011 ◽  
Vol 25 (S1) ◽  
Author(s):  
Rosana Inácio Reis ◽  
Lucas Tabajara Parreiras‐e‐Silva ◽  
Christiane Becari ◽  
Maria Claudina Andrade ◽  
Maria Cristina Oliveira Salgado ◽  
...  
Keyword(s):  
Signaling Pathways ◽  
Spontaneously Hypertensive Rats ◽  
Mesangial Cells ◽  
Converting Enzyme ◽  
Hypertensive Rats ◽  
Angiotensin I ◽  
Spontaneously Hypertensive ◽  
Angiotensin I Converting Enzyme
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