scholarly journals Pathophysiological Significance of a Novel Vasopressin Receptor (Vp) in Stroke-prone Spontaneously Hypertensive Rat Kidneys

1995 ◽  
Vol 36 (4) ◽  
pp. 504-504
Author(s):  
Hitoshi Endou ◽  
Michio Takeda
Keyword(s):  
Spontaneously Hypertensive Rat ◽  
Vasopressin Receptor ◽  
Spontaneously Hypertensive ◽  
Hypertensive Rat ◽  
Rat Kidneys

scholarly journals Endogenous dopamine regulates phosphate reabsorption but not NaK-ATPase in spontaneously hypertensive rat kidneys.

1994 ◽  
Vol 5 (4) ◽  
pp. 1125-1132
Author(s):  
A Debska-Slizien ◽  
P Ho ◽  
R Drangova ◽  
A D Baines
Keyword(s):  
Spontaneously Hypertensive Rat ◽  
Membrane Vesicle ◽  
Proximal Tubules ◽  
Spontaneously Hypertensive ◽  
Wky Rats ◽  
Endogenous Dopamine ◽  
Hypertensive Rat ◽  
Wistar Kyoto ◽  
Signaling Process ◽  
Rat Kidneys

Dopamine's modulatory actions on signal transduction in the spontaneously hypertensive rat (SHR) proximal tubule are blunted; therefore, it was predicted that dopamine does not regulate phosphate (Pi) reabsorption in SHR. To test this hypothesis, dopamine production was inhibited with carbidopa (10 mg/kg ip) 18 h before and during clearance measurements of chronically denervated SHR and Wistar-Kyoto (WKY) rat kidneys. Dopamine excretion decreased 80% from SHR and 85% from WKY rats. Pi excretion decreased 60 to 67%. Plasma Pi and calcium, inulin clearance, and Na excretion did not change. Citrate excretion, which reflects proton secretion by proximal tubules, decreased 72% from WKY rats. Citrate excretion was significantly lower from SHR (5 +/- 10 pmol/min) than from WKY rats (73 +/- 11 pmol/min) and was not altered by carbidopa. Carbidopa, injected 18 and 1 h before kidneys were collected, increased NaK-ATPase in cortical basolateral membranes from WKY rats (27%) but not in membranes from SHR. After the incubation of renal cortical minceates for 15 min with L-DOPA (10(-5) M), there was no change in brush border membrane vesicle uptake of 32Pi, (3H)glucose, or (14C)citrate. Incubation with carbidopa (10(-4) M) increased 32Pi uptake by 11% (P < 0.001) and (3H)glucose uptake by 9% (P = 0.02). (14C)citrate uptake was not increased by carbidopa but was higher in SHR (977 +/- 2 pmol/10 s.mg) than in WKY rats (823 +/- 43 pmol/10 s.mg; P = 0.04). In summary, dopamine produced in WKY rat and SHR proximal tubules decreases Pi uptake by using a signaling process distinct from those that regulate NaK-ATPase and the antiporter.(ABSTRACT TRUNCATED AT 250 WORDS)

A Linkage Analysis of the Salt-sensitive Hypertensive Gene in the Stroke-prone Spontaneously Hypertensive Rat (SHRSP)

1996 ◽  
Vol 37 (4) ◽  
pp. 553-553
Author(s):  
Tomoji Mashimo ◽  
Yasuo Nara ◽  
Tomoko Tamada ◽  
Chiho Matsumoto ◽  
Katumi Ikeda ◽  
...  
Keyword(s):  
Linkage Analysis ◽  
Spontaneously Hypertensive Rat ◽  
Spontaneously Hypertensive ◽  
Hypertensive Rat
Sign in / Sign up

Export Citation Format

Share Document