Abstract
| Originalsprog | Engelsk |
|---|---|
| Tidsskrift | American Journal of Physiology: Regulatory, Integrative and Comparative Physiology |
| Vol/bind | 283 |
| Udgave nummer | 4 |
| Sider (fra-til) | R837-42 |
| ISSN | 0363-6119 |
| DOI | |
| Status | Udgivet - 2002 |
Bibliografisk note
Keywords: Acute Disease; Angiotensin II; Angiotensin-Converting Enzyme Inhibitors; Animals; Blood Pressure; Bradykinin; Captopril; Diuresis; Drug Synergism; Hypertension; Kidney; Lithium; Male; Rats; Rats, Sprague-Dawley; Receptor, Bradykinin B2; Receptors, BradykininAdgang til dokumentet
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Diuretic response to acute hypertension is blunted during angiotensin II clamp. / Leong, Patrick K K; Zhang, Yibin; Yang, Li E; McDonough, Alicia A; Holstein-Rathlou, N.-H.
I: American Journal of Physiology: Regulatory, Integrative and Comparative Physiology, Bind 283, Nr. 4, 2002, s. R837-42.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review
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TY - JOUR
T1 - Diuretic response to acute hypertension is blunted during angiotensin II clamp.
AU - Leong, Patrick K K
AU - Zhang, Yibin
AU - Yang, Li E
AU - McDonough, Alicia A
AU - Holstein-Rathlou, N.-H.
N1 - Keywords: Acute Disease; Angiotensin II; Angiotensin-Converting Enzyme Inhibitors; Animals; Blood Pressure; Bradykinin; Captopril; Diuresis; Drug Synergism; Hypertension; Kidney; Lithium; Male; Rats; Rats, Sprague-Dawley; Receptor, Bradykinin B2; Receptors, Bradykinin
PY - 2002
Y1 - 2002
N2 - Acute hypertension inhibits proximal tubule (PT) fluid reabsorption. The resultant increase in end proximal flow rate provides the error signal to mediate tubuloglomerular feedback autoregulation of renal blood flow and glomerular filtration rate and suppresses renal renin secretion. To test whether the suppression of the renin-angiotensin system during acute hypertension affects the magnitude of the inhibition of PT fluid and sodium reabsorption, plasma ANG II levels were clamped by infusion of the angiotensin-converting enzyme (ACE) inhibitor captopril (12 microg/min) and ANG II after pretreatment with the bradykinin B(2) receptor blocker HOE-140 (100 microg/kg bolus). Because ACE also degrades bradykinin, HOE-140 was included to block effect of accumulating vasodilatory bradykinins during captopril infusion. HOE-140 increased the sensitivity of arterial blood pressure to ANG II: after captopril infusion without HOE-140, 20 ng x kg(-1) x min(-1) ANG II had no pressor effect, whereas with HOE-140, 20 ng x kg(-1) x min(-1) ANG II increased blood pressure from 104 +/- 4 to 140 +/- 6 mmHg. ANG II infused at 2 ng x kg(-1) x min(-1) had no pressor effect after captopril and HOE-140 infusion ("ANG II clamp"). When blood pressure was acutely increased 50-60 mmHg by arterial constriction without ANG II clamp, urine output and endogenous lithium clearance increased 4.0- and 6.7-fold, respectively. With ANG II clamp, the effects of acute hypertension were reduced 50%: urine output and endogenous lithium clearance increased two- and threefold, respectively. We conclude that HOE-140, an inhibitor of the B(2) receptor, potentiates the sensitivity of arterial pressure to ANG II and that clamping systemic ANG II levels during acute hypertension blunts the magnitude of the pressure diuretic response.
AB - Acute hypertension inhibits proximal tubule (PT) fluid reabsorption. The resultant increase in end proximal flow rate provides the error signal to mediate tubuloglomerular feedback autoregulation of renal blood flow and glomerular filtration rate and suppresses renal renin secretion. To test whether the suppression of the renin-angiotensin system during acute hypertension affects the magnitude of the inhibition of PT fluid and sodium reabsorption, plasma ANG II levels were clamped by infusion of the angiotensin-converting enzyme (ACE) inhibitor captopril (12 microg/min) and ANG II after pretreatment with the bradykinin B(2) receptor blocker HOE-140 (100 microg/kg bolus). Because ACE also degrades bradykinin, HOE-140 was included to block effect of accumulating vasodilatory bradykinins during captopril infusion. HOE-140 increased the sensitivity of arterial blood pressure to ANG II: after captopril infusion without HOE-140, 20 ng x kg(-1) x min(-1) ANG II had no pressor effect, whereas with HOE-140, 20 ng x kg(-1) x min(-1) ANG II increased blood pressure from 104 +/- 4 to 140 +/- 6 mmHg. ANG II infused at 2 ng x kg(-1) x min(-1) had no pressor effect after captopril and HOE-140 infusion ("ANG II clamp"). When blood pressure was acutely increased 50-60 mmHg by arterial constriction without ANG II clamp, urine output and endogenous lithium clearance increased 4.0- and 6.7-fold, respectively. With ANG II clamp, the effects of acute hypertension were reduced 50%: urine output and endogenous lithium clearance increased two- and threefold, respectively. We conclude that HOE-140, an inhibitor of the B(2) receptor, potentiates the sensitivity of arterial pressure to ANG II and that clamping systemic ANG II levels during acute hypertension blunts the magnitude of the pressure diuretic response.
U2 - 10.1152/ajpregu.00089.2002
DO - 10.1152/ajpregu.00089.2002
M3 - Journal article
C2 - 12228052
VL - 283
SP - R837-42
JO - American Journal of Physiology
JF - American Journal of Physiology
SN - 0363-6119
IS - 4
ER -