Glomerular Charge Selectivity in Primary Glomerulopathies

1994 ◽  
Vol 87 (4) ◽  
pp. 421-425 ◽  
Author(s):  
J. G. Fox ◽  
J. D. Quin ◽  
D. St. J. O'Reilly ◽  
J. M. Boulton-Jones
Keyword(s):  
Healthy Subjects ◽  
Excretion Rate ◽  
Albumin Excretion Rate ◽  
Albumin Excretion ◽  
Charge Selectivity ◽  
Wide Range ◽  
Size Restriction ◽  
Pancreatic Isoamylase ◽  
Excretion Rates ◽  
Normal Albumin

1. Glomerular charge selectivity was assessed using the ratio of the clearance of pancreatic isoamylase to the clearance of the more anionic salivary isoamylase (CPAm/CSAm) in 53 patients with primary glomerulopathies (minimal change nephropathy, idiopathic membranous nephropathy, IgA nephropathy) and a wide range of albumin excretion rates and in 31 healthy subjects. Fractional clearances of pancreatic and salivary isoamylases (FCPAm, FCSAm) and of albumin (FCAlb) were also measured. 2. CPAm/CSAm and FCPAm were negatively correlated with FCAlb for the whole patient group (rs = −0.56 and rs = −0.65, respectively, P < 0.0001 for both), but there was no correlation of FCSAm with FCAlb. 3. For patients with near-normal albumin excretion rates (< 100 mg/24 h), there was no difference in CPAm/CSAm between the three types of glomerulopathy or between patients and healthy subjects. 4. These data suggest that glomerular charge selectivity at the size of amylase (which is smaller than albumin) is progressively lost as albuminuria increases from normal to the nephrotic range. Size restriction progressively increases until albuminuria is very heavy. When the albumin excretion rate is near normal, charge selectivity is also normal in the three main forms of primary glomerulopathy.

Proteomic analysis for the assessment of diabetic renal damage in humans

2004 ◽  
Vol 107 (5) ◽  
pp. 485-495 ◽  
Author(s):  
Harald MISCHAK ◽  
Thorsten KAISER ◽  
Michael WALDEN ◽  
Meike HILLMANN ◽  
Stefan WITTKE ◽  
...  
Keyword(s):  
Proteomic Analysis ◽  
Type Ii Diabetes ◽  
Renal Damage ◽  
Excretion Rate ◽  
Albumin Excretion Rate ◽  
Low Grade ◽  
Type Ii ◽  
Polypeptide Pattern ◽  
Albumin Excretion ◽  
Normal Albumin

Renal disease in patients with Type II diabetes is the leading cause of terminal renal failure and a major healthcare problem. Hence early identification of patients prone to develop this complication is important. Diabetic renal damage should be reflected by a change in urinary polypeptide excretion at a very early stage. To analyse these changes, we used an online combination of CE/MS (capillary electrophoresis coupled with MS), allowing fast and accurate evaluation of up to 2000 polypeptides in urine. Employing this technology, we have examined urine samples from 39 healthy individuals and from 112 patients with Type II diabetes mellitus and different degrees of albumin excretion rate. We established a ‘normal’ polypeptide pattern in the urine of healthy subjects. In patients with Type II diabetes and normal albumin excretion rate, the polypeptide pattern in urine differed significantly from normal, indicating a specific ‘diabetic’ pattern of polypeptide excretion. In patients with higher grade albuminuria, we were able to detect a polypeptide pattern indicative of ‘diabetic renal damage’. We also found this pattern in 35% of those patients who had low-grade albuminuria and in 4% of patients with normal albumin excretion. Moreover, we could identify several of the indicative polypeptides using MS/MS sequencing. We conclude that proteomic analysis with CE/MS permits fast and accurate identification and differentiation of polypeptide patterns in urine. Longitudinal studies should explore the potential of this powerful diagnostic tool for early detection of diabetic renal damage.

Urinary albumin excretion and blood pressure in the general population

1989 ◽  
Vol 76 (1) ◽  
pp. 39-42 ◽  
Author(s):  
Peter Gosling ◽  
D. G. Beevers
Keyword(s):  
Blood Pressure ◽  
General Population ◽  
Urinary Albumin Excretion ◽  
Excretion Rate ◽  
Albumin Excretion Rate ◽  
Urinary Albumin ◽  
Albumin Excretion ◽  
Arterial Blood ◽  
Blood Pressures ◽  
Excretion Rates

1. Twenty-four hour urinary albumin excretion rate was measured by a sensitive radioimmunoassay in 99 male and 100 female randomly selected factory workers, aged between 20 and 60 years. 2 The median (range) albumin excretion rates for men and women of 4.67 (1.0–25.8) and 5.25 (0.2–33.0) mg/24 h, respectively, were not significantly different. 3. No correlation was established between diastolic, systolic or mean arterial blood pressure and albumin excretion rate for the whole group. 4. Twenty-eight subjects with systolic and/or diastolic blood pressures ≥ 140/90 mmHg (18.7/12.0 kPa) showed a positive correlation between mean arterial blood pressure and albumin excretion rate (r = 0.412,P < 0.01). 5. There was no significant relationship between number of cigarettes smoked, age or alcohol intake and albumin excretion rate. 6. The data suggest that in the general population albumin excretion rate is variable and not dependent on blood pressure, but at blood pressures > 140/90 mmHg (18.7/12.0 kPa) albumin excretion rate may become pressure dependent, although high albumin excretion rates were sometimes found in subjects with blood pressures < 140/90 mmHg (18.7/12.0 kPa).

scholarly journals Influence of strenuous exercise on albumin excretion.

1988 ◽  
Vol 34 (12) ◽  
pp. 2516-2518 ◽  
Author(s):  
B K Krämer ◽  
M Kernz ◽  
K M Ress ◽  
M Pfohl ◽  
G A Müller ◽  
...  
Keyword(s):  
Healthy Subjects ◽  
Excretion Rate ◽  
Albumin Excretion Rate ◽  
Bicycle Ergometer ◽  
Strenuous Exercise ◽  
Albumin Excretion

Abstract Renal albumin excretion rate was 7.3 mg/24 h (SEM 0.5, range 0.6-21.0) in 66 healthy subjects. This rate increased markedly during and shortly after strenuous exercise on a bicycle ergometer (before: 5.5 +/- 0.6 micrograms/min; during and just after: 16.9 +/- 2.2 micrograms/min; P less than 0.001; n = 30). However, albumin excretion/24 h was not significantly higher during 24 h with a period of strenuous exercise than during 24 h without such exercise (10.3 +/- 0.9 mg/24 h vs 8.5 +/- 0.7 mg/24 h).

Microalbuminuria Reflects a Generalized Transvascular Albumin Leakiness in Clinically Healthy Subjects

1995 ◽  
Vol 88 (6) ◽  
pp. 629-633 ◽  
Author(s):  
Jan Skov Jensen ◽  
Knut Borch-Johnsen ◽  
Gorm Jensen ◽  
BO Feldt-Rasmussen
Keyword(s):  
Confidence Interval ◽  
Healthy Subjects ◽  
Urinary Albumin Excretion ◽  
Excretion Rate ◽  
Albumin Excretion Rate ◽  
Urinary Albumin ◽  
Disappearance Rate ◽  
Urinary Albumin Excretion Rate ◽  
Albumin Excretion ◽  
Plasma Compartment

1. In epidemiological studies microalbuminuria, i.e. slightly elevated urinary albumin excretion rate, predicts increased atherosclerotic vascular morbidity and mortality. This study aimed to test the hypothesis that microalbuminuria in clinically healthy subjects is associated with a systemic transvascular albumin leakiness. In animal experiments the outflux of albumin and lipids to the arterial wall are highly correlated, and both are elevated in atherosclerosis. 2. All participants were recruited at random from a population-based epidemiological study, where the upper decile of urinary albumin excretion rate was 6.6 μg/min. Twenty-seven patients with persistent microalbuminuria (urinary albumin excretion rate 6.6–150 μg/min), and 56 age- and sex-matched control subjects with persistent normoalbuminuria (UAER ≤ 6.6 μg/min) were studied. 3. The systemic transvascular albumin leakage was measured as the fractional disappearance rate of 125I-labelled albumin from the total plasma compartment in 1 h after intravenous injection. 4. The fractional disappearance rate of albumin from the plasma compartment was higher in the microalbuminuric than in the normoalbuminuric group [5.8 (95% confidence interval 5.3–6.2; n = 27) versus 5.0 (4.6–5.5; n = 56)%/h, P < 0.05]. The positive correlation between urinary albumin excretion rate on continuous scale (logarithmically transformed) and the fractional disappearance rate of albumin from the plasma compartment [slope 0.4 (95% confidence interval 0.1–0.7; n = 83), r = 0.29, P < 0.005] was independent of age, sex, smoking status, blood pressure, body size, plasma volume, plasma albumin concentration and concentrations of blood glucose, serum insulin and serum lipids. 5. In conclusion, microalbuminuria is an independent marker of systemic transvascular albumin leakiness in clinically healthy subjects. This finding may partly explain the increased atherosclerotic vascular morbidity and mortality in microalbuminuric subjects. It is suggested that the observed transvascular leakiness, in addition, may cause increased lipid insudation to the arterial walls.

scholarly journals The expression of POMC and AgRP in brain and kidney tissues at different stages of diabetic nephropathy rats

2021 ◽  
Vol 1 (1) ◽  
pp. 43-49
Author(s):  
Shasha Liu ◽  
Jingjing Da ◽  
Jiayu Li ◽  
Rong Dong ◽  
Jing Yuan ◽  
...  
Keyword(s):  
Body Weight ◽  
Diabetic Nephropathy ◽  
Blood Glucose ◽  
Urinary Albumin Excretion ◽  
Excretion Rate ◽  
Kidney Tissue ◽  
Albumin Excretion Rate ◽  
Urinary Albumin ◽  
Urinary Albumin Excretion Rate ◽  
Albumin Excretion

Abstract Objective To explore the changes of proopiomelanocortin (POMC) and Agouti-Related Peptide (AgRP) expression in brain and kidney tissues under insulin intervention at different stages of diabetic nephropathy (DN) rats. Methods The male Sprague-Dawley (SD) rats of DN were treated with high-fat diet for 8 weeks and induced by intraperitoneally injection of streptozotocin (30 mg/kg) for one time. Then DN rats were also injected insulin subcutaneously at 2–5 U/(kg·24 h) from initiation of the streptozotocin. Kidney tissue, blood sample, and 24 h-urine were collected to detect the ratio of kidney/body weight, blood glucose and 24-h urinary albumin excretion rate at different stages (4, 8, 12, and 16 weeks). Immunohistochemistry assay was used to measure the expression of POMC and AgRP at different stages of DN rats. Results The DN rats were established successfully. With the progression of DN, blood glucose, 24-h urinary albumin excretion rate and kidney body weight ratio increased significantly, while decreased when insulin was injected. Immunohistochemistry showed that the expression levels of POMC were decreased gradually in brain and kidney tissues. Conversely, the expression of AgRP in kidney was highest at week 8 and then decreased gradually. The effect of insulin on normalizing POMC and AgRP expression in brain and renal tissues was also observed in DKD rats. Conclusion With the progression of DN, the expression of POMC and AgRP in kidney tissues was observed at different stages of disease, and their expressions were significantly normalized by insulin. The mechanism of in situ expression of POMC and AGRP in kidney to the progression of DN needs further investigations.

Glycosaminoglycans as a Possible Tool for Micro- and Macroalbuminuria in Diabetic Patients. A Pilot Study

1997 ◽  
Vol 25 (2) ◽  
pp. 81-86 ◽  
Author(s):  
G Sorrenti ◽  
M Grimaldi ◽  
N Canova ◽  
E Palazzini ◽  
N melchionda
Keyword(s):  
Type Ii Diabetes ◽  
Excretion Rate ◽  
Albumin Excretion Rate ◽  
Favourable Effect ◽  
Diabetic Patients ◽  
Type Ii ◽  
Therapeutic Tool ◽  
Albumin Excretion ◽  
End Of Treatment

The aim was to investigate sulodexide as a possible therapeutic tool for treating micro- and macroalbuminuria in diabetic patients. Fifteen patients (13 micro- and 2 macroalbuminuric) with Type II diabetes, were treated with 600 lipoprotein-lipase releasing units of sulodexide by the intramuscular route, daily for 28 days, and followed up for 2 months. The main evaluation parameter was the albumin excretion rate. At the end of treatment, six of the 13 microalbuminuric patients showed a decrease in the albumin excretion rate, which increased again in three of the six during follow-up. In the two macroalbuminuric patients the albumin excretion rate decreased at the end of treatment and remained unchanged after a further 2 months. Overall analysis (15 patients) showed a significant decrease ( P < 0.05) in the albumin excretion rate compared with baseline. Metabolic control and blood pressure remained unchanged during the entire period of study. No adverse events were registered. It is concluded that sulodexide administration has a favourable effect in reducing the albumin excretion rate in Type II diabetic patients with micro- and macroalbuminuria.

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