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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Am+Soc+Hypertens
2016 ; 10
(4
): 346-51
Nephropedia Template TP
gab.com Text
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English Wikipedia
Renal intramedullary infusion of tempol normalizes the blood pressure response to
intrarenal blockade of heme oxygenase-1 in angiotensin II-dependent hypertension
#MMPMID26922123
Stec DE
; Juncos LA
; Granger JP
J Am Soc Hypertens
2016[Apr]; 10
(4
): 346-51
PMID26922123
show ga
Previous studies have demonstrated that intramedullary inhibition of heme
oxygenase-1 (HO-1) increases the blood pressure and superoxide production
response to angiotensin II (Ang II) infusion. The present study was designed to
test the hypothesis that increased renal medullary superoxide production
contributes to the increase in blood pressure in response to blockade of renal
medullary HO-1 in Ang II-induced hypertension. Male C57BL/6J mice (16-24 weeks of
age) were implanted with chronic intrarenal medullary interstitial (IRMI) and
infused with: saline, tempol (6 mM), the HO-1 inhibitor QC-13 (25 ?M), or a
combination of tempol + QC-13. Tempol treatment was started 2 days before
infusion of QC-13. After 2 days, Ang II was infused subcutaneously at a rate of 1
?g/kg/min for 10 days. Blood pressures on days 7-10 of Ang II infusion alone
averaged 150 ± 3 mm Hg in mice receiving IRMI infusion of saline. IRMI infusion
of QC-13 increased blood pressure in Ang II-treated mice to 164 ± 2 (P < .05).
Renal medullary superoxide production in Ang II-treated mice was significantly
increased by infusion of QC-13 alone. Ang II-treated mice receiving IRMI infusion
of tempol had a blood pressure of 136 ± 3 mm Hg. Ang II-treated mice receiving
IRMI infusion of tempol and QC-13 had a significantly lower blood pressure (142 ±
2 mm Hg, P < .05) than mice receiving QC-13 alone. The increase in renal
medullary superoxide production was normalized by infusion of tempol alone or in
combination with QC-13. These results demonstrate that renal medullary
interstitial blockade of HO-1 exacerbates Ang II-induced hypertension via a
mechanism that is dependent on enhanced superoxide generation and highlight the
important antioxidant function of HO-1 in the renal medulla.