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2015 ; 65
(3
): 561-8
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Null mutation of the nicotinamide adenine dinucleotide phosphate-oxidase subunit
p67phox protects the Dahl-S rat from salt-induced reductions in medullary blood
flow and glomerular filtration rate
#MMPMID25489057
Evans LC
; Ryan RP
; Broadway E
; Skelton MM
; Kurth T
; Cowley AW Jr
Hypertension
2015[Mar]; 65
(3
): 561-8
PMID25489057
show ga
Null mutations in the p67(phox) subunit of nicotinamide adenine dinucleotide
phosphate-oxidase confer protection from salt sensitivity on Dahl salt-sensitive
rats. Here, we track the sequential changes in medullary blood flow (MBF),
glomerular filtration rate (GFR), urinary protein, and mean arterial pressure in
SSp67(phox) null rats and wild-type littermates during 21 days of 4.0% NaCl
high-salt (HS) diet. Optical fibers were implanted in the renal medulla and MBF
was measured in conscious rats by laser Doppler flowmetry. Separate groups of
rats were prepared with femoral venous catheters and GFR was measured by the
transcutaneous assessment of fluorescein isothiocyanate-sinistrin disappearance
curves. Mean arterial blood pressure was measured by telemetry. In wild-type
rats, HS caused a rapid reduction in MBF, which was significantly lower than
control values by HS day-6. Reduced MBF was associated with a progressive
increase in mean arterial pressure, averaging 170±5 mm Hg by HS salt day-21. A
significant reduction in GFR was evident on day-14 HS, after the onset of
hypertension and reduced MBF. In contrast, HS had no significant effect on MBF in
SSp67(phox) null rats and the pressor response to sodium was blunted, averaging
150±3 mm Hg on day-21 HS. GFR was maintained throughout the study and proteinuria
was reduced. In summary, when p67(phox) is not functional in the salt-sensitive
rats, HS does not cause reduced MBF and salt-sensitive hypertension is
attenuated, and consequently renal injury is reduced and GFR is maintained.
|Animals
[MESH]
|Blood Pressure/drug effects/physiology
[MESH]
|Creatinine/metabolism
[MESH]
|Disease Models, Animal
[MESH]
|Glomerular Filtration Rate/*drug effects
[MESH]
|Hypertension/metabolism/physiopathology/*prevention & control
[MESH]