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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+Nephrol
2014 ; 25
(7
): 1523-32
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Angiotensin II dose-dependently stimulates human renal proximal tubule transport
by the nitric oxide/guanosine 3 ,5 -cyclic monophosphate pathway
#MMPMID24511122
Shirai A
; Yamazaki O
; Horita S
; Nakamura M
; Satoh N
; Yamada H
; Suzuki M
; Kudo A
; Kawakami H
; Hofmann F
; Nishiyama A
; Kume H
; Enomoto Y
; Homma Y
; Seki G
J Am Soc Nephrol
2014[Jul]; 25
(7
): 1523-32
PMID24511122
show ga
Stimulation of renal proximal tubule (PT) transport by angiotensin II (Ang II) is
critical for regulation of BP. Notably, in rats, mice, and rabbits, the
regulation of PT sodium transport by Ang II is biphasic: transport is stimulated
by picomolar to nanomolar concentrations of Ang II but inhibited by nanomolar to
micromolar concentrations of Ang II. However, little is known about the effects
of Ang II on human PT transport. By functional analysis with isolated PTs
obtained from nephrectomy surgery, we found that Ang II induces a dose-dependent
profound stimulation of human PT transport by type 1 Ang II receptor
(AT1)-dependent phosphorylation of extracellular signal-regulated kinase (ERK).
In PTs of wild-type mice, the nitric oxide (NO) /cGMP/cGMP-dependent kinase II
(cGKII) pathway mediated the inhibitory effect of Ang II. In PTs of
cGKII-deficient mice, the inhibitory effect of Ang II was lost, but activation of
the NO/cGMP pathway failed to phosphorylate ERK. Conversely, in human PTs, the
NO/cGMP pathway mediated the stimulatory effect of Ang II by phosphorylating ERK
independently of cGKII. These contrasting responses to the NO/cGMP pathway may
largely explain the different modes of PT transport regulation by Ang II, and the
unopposed marked stimulation of PT transport by high intrarenal concentrations of
Ang II may be an important factor in the pathogenesis of human hypertension.
Additionally, the previously unrecognized stimulatory effect of the NO/cGMP
pathway on PT transport may represent a human-specific therapeutic target in
hypertension.