Effects of nephrectomy and high-protein diets on glomerular hemodynamics and urinary protein excretion in diabetic rats

1988 ◽  
Vol 2 (1) ◽  
pp. 30-33 ◽  
Author(s):  
Ronald G. Tilton ◽  
Giuseppe Pugliese ◽  
Kathy Chang ◽  
Charles Kilo ◽  
Joseph R. Williamson
Keyword(s):  
Diabetic Rats ◽  
Urinary Protein Excretion ◽  
Urinary Protein ◽  
High Protein ◽  
Protein Excretion ◽  
Glomerular Hemodynamics ◽  
High Protein Diets ◽  
Protein Diets

scholarly journals Effects of Low-Protein Diets Supplemented with Ketoacid on Expression of TGF-βand Its Receptors in Diabetic Rats

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Xiu Yang ◽  
Ming Yang ◽  
Ming Cheng ◽  
Li-Bin Ma ◽  
Xiang-Cheng Xie ◽  
...  
Keyword(s):  
Renal Tissue ◽  
Diabetic Rats ◽  
Urinary Protein Excretion ◽  
Urinary Protein ◽  
Low Protein ◽  
Protein Excretion ◽  
Sd Rats ◽  
Diabetes Model ◽  
Mrna And Protein Expression ◽  
Protein Diets

TGF-β1has been recognized as a key mediator in DN. This study aimed to observe the effects of low-protein diets supplemented with ketoacid on mRNA and protein expression of TGF-βand TβRI and t TβRII receptors in the renal tissue of diabetic rats. A diabetes model was established in 72 male SD rats. They were then equally randomized to three groups: NPD group, LPD group, and LPD + KA group. Additional 24 male SD rats receiving normal protein diets were used as the control. Eight rats from each group were sacrificed at weeks 4, 8, and 12 after treatment, from which SCr, BUN, serum albumin, and 24 h urinary protein excretion were collected. The expressions of TGF-β1, TβRI, and TβRII in LPD and LPD + KA groups were significantly lower than those in NPD group and lower in LPD + KA group than those in LPD group. Low-protein diets supplemented with ketoacid have been demonstrated to provide a protective effect on the renal function as represented by reduced SCr, BUN, and urinary protein excretion, probably through downregulating the gene expression of TGF-β1and its receptors in LPD + KA group.

Glomerular size selectivity in nephrotic rats exposed to diets with different protein content

1987 ◽  
Vol 253 (2) ◽  
pp. F318-F327
Author(s):  
A. Remuzzi ◽  
C. Battaglia ◽  
L. Rossi ◽  
C. Zoja ◽  
G. Remuzzi
Keyword(s):  
High Protein Diet ◽  
Urinary Protein Excretion ◽  
Urinary Protein ◽  
High Protein ◽  
Protein Diet ◽  
Standard Diet ◽  
Size Selectivity ◽  
Protein Excretion ◽  
Fractional Clearance ◽  
Glomerular Size

Glomerular size-selective properties in animals made nephrotic by adriamycin (ADR) injection and fed standard (20% protein) or high-protein (35% protein) diets were investigated using dextran fractional clearances. To interpret filtration and dextran-sieving data, a theoretical approach previously developed for analysis of experimental data in healthy and nephrotic humans was used. Four types of hypothetical pore-radius distributions were compared in order to establish the best tool for describing membrane pore structure in normal and nephrotic rats. This analysis revealed that a spread distribution of pores, the lognormal probability distribution, is the most adequate in representing membrane intrinsic characteristics. ADR animals on standard diet developed massive proteinuria and a lower glomerular filtration rate (GFR) than control animals. High-protein feeding in ADR rats induced a further increase in urinary protein excretion and in GFR. Dextran fractional clearance was more elevated for larger dextran fractions (greater than 46 A) in ADR animals on the standard diet than in control rats. No differences were observed in dextran-sieving curves between ADR rats on the standard and high-protein diet. Theoretical analysis of filtration and fractional clearance data revealed comparable changes in the intrinsic parameters of glomerular size selectivity in the two groups of nephrotic animals. These observations indicate that increased traffic of plasma proteins through the glomerular capillary wall does not imply, in our experimental condition, a further loss of glomerular size-selective properties. The greater urinary protein excretion of ADR animals on high-protein diet than ADR animals on a standard diet cannot be explained by further impairment of glomerular size selectivity but more likely reflects hemodynamic changes.

Beneficial effects of low-carbohydrate-high-protein diets in long-term diabetic rats

Metabolism ◽  
1980 ◽  
Vol 29 (5) ◽  
pp. 421-428 ◽  
Author(s):  
Eberhard G. Siegel ◽  
Volker E. Trapp ◽  
Claes B. Wollheim ◽  
Albert E. Renold ◽  
Felix H. Schmidt
Keyword(s):  
Diabetic Rats ◽  
High Protein ◽  
Beneficial Effects ◽  
Low Carbohydrate ◽  
High Protein Diets ◽  
Protein Diets

Long-term effects of a somatostatin analogue on renal haemodynamics and hypertrophy in diabetic rats

1992 ◽  
Vol 83 (5) ◽  
pp. 575-581 ◽  
Author(s):  
Martin Muntzel ◽  
Thierry Hannedouche ◽  
Roberte Niesor ◽  
Laure-Helène Nöel ◽  
Jean-Claude Souberbielle ◽  
...  
Keyword(s):  
Body Weight ◽  
Diabetic Rats ◽  
Urinary Protein Excretion ◽  
Urinary Protein ◽  
Somatostatin Analogue ◽  
Renal Hypertrophy ◽  
Protein Excretion ◽  
Average Body ◽  
Average Body Weight

1. To determine whether treatment with octreotide, a somatostatin analogue, may diminish or prevent long-term diabetic renal hypertrophy and nephropathy, uninephrectomized streptozotocin-diabetic rats maintained under moderate glycaemic control (∼300 mg/dl) were treated with either placebo (n = 10 rat/group) or octreotide for 14 weeks. Uninephrectomized non-diabetic rats given either placebo or octreotide served as controls. 2. Average body weight was diminished and kidney weight, daily urinary protein excretion, glomerular filtration rate and renal plasma flow were elevated in both diabetic groups relative to controls. 3. Administration of octreotide reduced average body weight and packed cell volume in non-diabetic and diabetic rats compared with their respective controls, but did not affect glomerular hyperfiltration or the increase in urinary protein excretion. 4. Histological examination at 14 weeks disclosed unequivocal glomerular hypertrophy and mild glomerular and tubulointerstitial lesions consistent with early diabetic renal alterations in all diabetic rats, but there was no independent effect of octreotide treatment 5. Thus, long-term treatment with octreotide did not afford protection against the development of renal hypertrophy-hyperfiltration and the evolution of early diabetic nephropathy in rats.

scholarly journals The Diabetic Nephropathy and the Development of Hypertension in Rats

2001 ◽  
Vol 2 (3) ◽  
pp. 195-199 ◽  
Author(s):  
Adriana Zuccollo ◽  
Monica Navarro ◽  
Orlando Catanzaro
Keyword(s):  
Diabetic Nephropathy ◽  
Diabetic Rats ◽  
Urinary Protein Excretion ◽  
Urinary Protein ◽  
The Other ◽  
Urinary Kallikrein ◽  
Hypertensive Rats ◽  
The Third ◽  
Protein Excretion ◽  
High Prevalence

The present study was designed to examine the development of hypertension in diabetic rats treated with streptozotocin (STZ, 1mg/g bw). The rats were studied at 3, 6, 9, 12 and 15 weeks. From the third week the rats were divided in diabetic rats according their glycemias and controls, along 15 weeks. After the third week a group, of rats showed increased urinary protein excretion (93, 134, 155 and 191%) compared to controls. In this group of rats the urinary kallikrein excretion was lower than control and the systolic blood pressure became significantly elevated between 3 and 6 weeks and persisted up to 15 weeks. On the other hand a group of diabetic rats were normotensive with urinary protein excretion similar to controls and urinary kallikrein lower compared to control but significantly higher compared diabetic hypertensive rats. These data suggest that the association of progressive diabetic nephropathy with abnormal endothelium-dependent vasodilation may produce a high prevalence of hypertensive diabetes.

scholarly journals Evidence that an angiotensin-converting enzyme inhibitor has a different effect on glomerular injury according to the different phase of the disease at which the treatment is started.

1994 ◽  
Vol 5 (4) ◽  
pp. 1139-1146
Author(s):  
N Perico ◽  
S C Amuchastegui ◽  
V Colosio ◽  
G Sonzogni ◽  
T Bertani ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Angiotensin Converting Enzyme ◽  
Systolic Blood Pressure ◽  
Ace Inhibitor ◽  
Diabetic Rats ◽  
Urinary Protein Excretion ◽  
Urinary Protein ◽  
Converting Enzyme ◽  
Glomerular Injury ◽  
Protein Excretion

In rats with streptozotocin-induced diabetes, the effect of an angiotensin-converting enzyme (ACE) inhibitor on the evolution of glomerular injury according to the time at which the treatment is started with respect to the onset of the disease was studied. Three groups of animals were used, a control Group 1 and two groups of diabetic rats treated with insulin (Groups 2 and 3). The latter were monitored until urinary protein excretion reached 40 to 50 mg/24 h (on average, 23 wk after the induction of the diabetes). At this time, Group 2 continued to receive insulin alone, whereas Group 3 was also given the ACE inhibitor moexipril for 8 more wk. Untreated diabetic rats showed a moderate increase in systolic blood pressure that was normalized by moexipril administration. Urinary protein excretion progressively increased during the 8-wk follow-up in untreated diabetics that, at the end of the study, developed moderate glomerular sclerosis. Moexipril treatment lowered urinary protein excretion to a normal range and completely prevented glomerular injury. Three other groups of rats were similarly treated, except that moexipril treatment was started later on (when proteinuria reached 100 to 200 mg/24 h, on average, 32 wk after the induction of diabetes), and were monitored for another 8 wk. Untreated and treated diabetics had comparable blood glucose levels throughout. Systolic blood pressure, significantly increased in untreated diabetic rats, was effectively controlled by moexipril administration.(ABSTRACT TRUNCATED AT 250 WORDS)

Effect of a somatostatin analogue (SMS 201–995) on renal function and urinary protein excretion in diabetic rats

1991 ◽  
Vol 5 (2-3) ◽  
pp. 181-183 ◽  
Author(s):  
Kazumasa Igarashi ◽  
Asao Nakazawa ◽  
Nagayuki Tani ◽  
Masatoshi Yamazaki ◽  
Seiki Ito ◽  
...  
Keyword(s):  
Renal Function ◽  
Diabetic Rats ◽  
Urinary Protein Excretion ◽  
Urinary Protein ◽  
Somatostatin Analogue ◽  
Protein Excretion

scholarly journals Biphasic Vasodilator Action of Troglitazone on the Renal Microcirculation

2002 ◽  
Vol 13 (2) ◽  
pp. 342-349 ◽  
Author(s):  
Shuji Arima ◽  
Kentaro Kohagura ◽  
Kazuhisa Takeuchi ◽  
Yoshihiro Taniyama ◽  
Akira Sugawara ◽  
...  
Keyword(s):  
Constant Pressure ◽  
Calcium Influx ◽  
Late Phase ◽  
Underlying Mechanism ◽  
Urinary Protein Excretion ◽  
Urinary Protein ◽  
Protein Excretion ◽  
Glomerular Hemodynamics ◽  
Vasodilator Action ◽  
Dose Dependent

ABSTRACT. Recent studies have demonstrated that thiazolidinediones, novel antidiabetic compounds that improve the insulin sensitivity, lower BP and decrease urinary protein excretion. However, neither the target vasculature nor the underlying mechanism for their actions is well understood. In this study, the action of troglitazone (Tro), a thiazolidinedione compound, on the glomerular afferent (Af-Arts) and efferent (Ef-Arts) arterioles, crucial vascular segments to the control of glomerular hemodynamics, were directly examined. Rabbit Af-Arts or Ef-Arts were microdissected from the superficial cortex and perfused at constant pressure. Increasing doses of Tro (10−8 to 10−5 M) were added to both the bath and lumen of preconstricted arterioles. In Af-Arts, Tro caused dose-dependent and biphasic dilation. Tro at 10−5 M increased the diameter by 28 ± 6% (n = 8, P < 0.01) until 20 min, with the diameter remaining at this level for 60 min, and then Tro began to dilate Af-Arts again. At 120 min, Tro at 10−5 M further increased the diameter by 23 ± 4% (n = 6). Disrupting the endothelium had no effect on either dilation (n = 7 or n = 5). Pretreatment with SKF 96365 (50 μM), which inhibits both voltage- and receptor-operated calcium channels, abolished the early-phase dilation without affecting the late-phase dilation; 20 or 120 min after adding Tro at 10−5 M, the diameter increased by 4 ± 2% (n = 7) or 28 ± 3% (n = 6), respectively. In contrast to Af-Arts, Tro caused monophasic dilation in Ef-Arts; Tro at 10−5 M did not cause significant dilation until 80 min, and at 120 min the diameter increased by 37 ± 4% (n = 5). These results suggest that in the Af-Art Tro has biphasic endothelium-independent vasodilator action, which is partly mediated by an inhibition of calcium influx. This vasodilator action may play a role in the BP-lowering effect of Tro. In addition, by dilating the postglomerular Ef-Art, Tro may decrease the glomerular capillary pressure and hence the excretion of urinary protein.

scholarly journals Effect of Huayu Tongluo Herbs on Reduction of Proteinuria via Inhibition of Wnt/β-Catenin Signaling Pathway in Diabetic Rats

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Lu Bai ◽  
Beibei Huo ◽  
Zhiqiang Chen ◽  
Qian Guo ◽  
Jing Xu ◽  
...  
Keyword(s):  
Signaling Pathway ◽  
Interstitial Fibrosis ◽  
Fasting Blood Glucose ◽  
Diabetic Rats ◽  
Urinary Protein Excretion ◽  
Urinary Protein ◽  
Control Group ◽  
Intragastric Administration ◽  
Beta Catenin ◽  
Protein Excretion

The study investigated the expression of Wnt/β-catenin pathway in diabetic rats and the intervention effect of Huayu Tongluo herbs (HTH). Ten rats were randomly selected as control group and the remaining rats were established as diabetic models. The diabetic rats were randomly divided into model group and HTH treatment group. The intervention was intragastric administration in all rats for 20 weeks. At the end of every 4 weeks, fasting blood glucose and 24 h urinary total protein quantitatively were measured. At the end of the 20th week, biochemical parameters and body weight were tested. The kidney tissues were observed under light microscope and transmission electron microscopy. We examined Wnt/beta-catenin signaling pathway key proteins and renal interstitial fibrosis related molecular markers expression. The results showed that HTH could reduce urinary protein excretion and relieve renal pathological damage. Wnt4, p-GSK3β (S9), and β-catenin expression were decreased in the signaling pathway, but GSK3β level was not changed by HTH in diabetic rats. Furthermore, the expressions of TGF-β1 and ILK were decreased, but the level of E-cadherin was increased in diabetic rats after treatment with HTH. This study demonstrated that HTH could inhibit the high expression of Wnt/β-catenin pathway in kidney of diabetic rats. The effect might be one of the main ways to reduce urinary protein excretion.

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