Relative Resistance to the Hypertensive Effects of Desoxycorticosterone During Active Phase of Renal Compensatory Hypertrophy

1958 ◽  
Vol 194 (2) ◽  
pp. 236-240 ◽  
Author(s):  
C. E. Hall ◽  
O. Hall

An attempt was made to ascertain the circumstances under which unilateral nephrectomy maximally sensitized rats to hypertensive cardiovascular disease induced by desoxycorticosterone acetate in the presence of augmented NACl intake. The experiments showed that animals in which hormone treatment was delayed until 2 weeks after uninephrectomy were much more sensitive than animals in which hormone treatment was begun on the day of kidney removal. This was indicated by earlier onset and greater severity of hypertension; by a larger percentage of animals in such groups being affected, and by a greater incidence and severity of cardiovascular lesions in the former as compared with the latter. The much greater kidney size of the former clearly makes it difficult to ascribe the greater sensitivity to a reduction in renal mass as such. It is thought that during active compensatory renal hypertrophy the renal tubules are probably less responsive to the action of the hormone and therefore less prone to develop sodium retention and hence hypertension.

1976 ◽  
Vol 69 (3) ◽  
pp. 548-556 ◽  
Author(s):  
W T Melvin ◽  
A Kumar ◽  
R A Malt

After removal of one mouse kidney, compensatory hypertrophy in the remaining kidney is marked in 2 days by a 20% average increase in ribosomal RNA (rRNA) per cell. Both 28S and 18S RNA are conserved during the initial stages of compensatory renal hypertrophy to an extent sufficient to account for the rest of the observed accumulation of rRNA. Like some cultured cells, the kidney conserves rRNA during physiological growth.


1938 ◽  
Vol 67 (4) ◽  
pp. 515-519 ◽  
Author(s):  
Lois L. MacKay ◽  
T. Addis ◽  
Eaton M. MacKay

Compensatory hypertrophy of the kidney in albino rats is increased by an increase in the protein intake. The effect is greater in old rats than young rats. Successive increases in the protein intake are followed by a reduction in the increase in the degree of compensatory renal hypertrophy.


1977 ◽  
Vol 55 (4) ◽  
pp. 839-847 ◽  
Author(s):  
J. Martel-Pelletier ◽  
M. Bergeron

This study describes a method for the measurement and partial purification of a factor seemingly involved in the regulation of the renal mass.After homogenization at 4 °C, rabbit kidneys were centrifuged for 100 min at 105 000 g. The resulting supernatant (S-105) was lyophilized and tested on kidney slices obtained from rats mononephrectomized 48 h previously. We have developed a method based on the inhibition of DNA synthesis to measure the activity of the S-105. Slices of renal cortex, undergoing compensatory hypertrophy, were incubated in vitro in Hanks' medium at 37 °C, pH 7.4, in an O2–CO2 atmosphere in the presence of 0.144 μg (20 μCi (1 Ci = 37 GBq)) [3H]thymidine.An inhibition of DNA uptake of [3H]thymidine was noted in the presence of S-105. When other media (Hanks', sucrose, water) were used to extract S-105, the same type of inhibition was noted even though the sucrose buffer seemed ideal for the preservation of the inhibitory factor. The inhibitory effect was still observed after dialysis of S-105 against membranes permitting exclusion of molecules with molecular weight smaller than about 4000 (such as electrolytes and tissue thymidine). This inhibition seems to be specific, since other tissues such as liver in regeneration and rat intestine were not influenced by the dialyzed renal S-105. The dialyzable fraction did contain some inhibitors, but they were not specific for the kidney since they also acted on the liver and the jejunum.Our results suggest the existence, in the normal nephron, of a specific inhibitor of thymidine incorporation into DNA of kidneys undergoing a compensatory hypertrophy. This renal factor has a molecular weight of over 5000.


1974 ◽  
Vol 144 (3) ◽  
pp. 447-453 ◽  
Author(s):  
J M Hill ◽  
G Ab ◽  
R A Malt

During the first 48h of compensatory renal hypertrophy induced by unilateral nephrectomy, RNA content per cell increased by 20–40%. During this period, rates of RNA synthesis derived from the rates of labelling of UTP and RNA after a single injection of [5-3H]uridine showed no change in the rate of RNA synthesis (3.1nmol of UTP incorporated into RNA/min per mg of RNA). ATP and ADP pools were not changed. The rate of RNA synthesis was considerably in excess of the increment of total RNA appearing in the kidneys. With [5-3H]uridine as label, only continuous infusion for 24h could produce an increase (60%) in the specific radioactivity of renal rRNA in mice with contralateral nephrectomies. With a single injection of [methyl-3H]methionine used to identify methyl groups inserted into newly synthesized rRNA, the specific radioactivity of this rRNA was unchanged 5h after contralateral nephrectomy, increased by 60% at 9–48h, and returned to normal values at 120h. Most RNA synthesized in both nephrectomized and sham-nephrectomized mice has a short half-life. Since total cellular RNA content increases in compensatory hypertrophy despite unchanged rates of rRNA synthesis, the accretion of RNA might involve conservation of ribosomal precursor RNA or a change in rate of degradation of mature rRNA.


2012 ◽  
Vol 302 (11) ◽  
pp. F1402-F1408 ◽  
Author(s):  
Hajime Nagasu ◽  
Minoru Satoh ◽  
Kengo Kidokoro ◽  
Yuko Nishi ◽  
Keith M. Channon ◽  
...  

Loss of functional nephrons associated with chronic kidney disease induces glomerular hyperfiltration and compensatory renal hypertrophy. We hypothesized that the endothelial nitric oxide synthase (eNOS) [soluble guanylate cyclase (sGC)] protein kinase G (PKG) pathway plays an important role in compensatory renal hypertrophy after unilateral nephrectomy. Analysis of mice subjected to unilateral nephrectomy showed increases in kidney weight-to-body weight and total protein-to-DNA ratios in wild-type but not eNOS knockout (eNOSKO) mice. Serum creatinine and blood urea nitrogen increased after nephrectomy in eNOSKO but not in wild-type mice. Furthermore, Bay 41–2272, an sGC stimulator, induced compensatory renal hypertrophy in eNOSKO mice and rescued renal function. The NO donor S-nitrosoglutathione (GSNO) and Bay 41–2272 stimulated PKG activity and induced phosphorylation of Akt protein in human proximal tubular cells. GSNO also induced phosphorylation of eukaryotic initiation factor 4E-binding protein and ribosomal protein S6. Our results highlight the importance of the eNOS-NO-PKG pathway in compensatory renal hypertrophy and suggest that reduced eNOS-NO bioavailability due to endothelial dysfunction is the underlying mechanism of failure of compensatory hypertrophy and acceleration of progressive renal dysfunction.


1932 ◽  
Vol 56 (2) ◽  
pp. 255-265 ◽  
Author(s):  
E. M. MacKay ◽  
L. L. MacKay ◽  
T. Addis

Compensatory hypertrophy of the kidney in albino rats becomes less as age advances. There is a rapid decrease from 5 days to 60 days of age and then a slow diminution throughout adult life.


2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Suria Emilia Suhana Othman Tan ◽  
Siti Dayana Mohamad ◽  
Muhamad Zabidi Ahmad

ABSTRACT Hypertensive emergency in the paediatric population is not uncommon. However, due to its numerous etiologies, care should be taken in determining the approach of management. We report a case of a child who presented with double vision, giddiness and elevated blood pressure. Blood investigations were normal. Renal ultrasound and magnetic resonance imaging of the abdomen were performed which both showed findings suspicious of a large heterogeneous mass at the lower pole of the left kidney with dysplastic right kidney. A final diagnosis of bilateral vesicoureteric reflux with left compensatory hypertrophy was made based upon micturating cystourethrography findings and was later confirmed by 99mTc-dimercaptosuccinic acid (DMSA) study. The objective of this case is to share the importance of the appropriate choice of radiological examinations, not only in achieving an accurate diagnosis but to ensure that unnecessary investigations are avoided.


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