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1.
Exp Nephrol ; 9(1): 40-8, 2001.
Article in English | MEDLINE | ID: mdl-11053979

ABSTRACT

The present paper reports the glomerular and renal individual glycosaminoglycan levels in an experimental model of chronic renal failure (CRF) that was induced in Wistar rats by five-sixths mass ablation. Glycemia, body weight, blood systolic pressure and urinary excretions of creatinine, albumin and glycosaminoglycans were measured for 12 weeks. At the end of the experiment, the weight and the glycosaminoglycan composition of the kidneys were determined. In control rats, heparan sulfate was the main glycosaminoglycan found both in whole kidney and isolated glomeruli, with trace amounts of dermatan sulfate. Isolated glomeruli presented higher heparan sulfate concentrations than whole kidney (expressed as mg/g dry weight). In CRF rats, albuminuria appeared from the 2 week on, and dermatan sulfate and chondroitin sulfate contents of the kidney increased, whereas heparan sulfate levels remained unaltered. Changes in urine glycosaminoglycans (heparan sulfate, chondroitin sulfate and dermatan sulfate) were not statistically significant. The increase in glomerular dermatan sulfate and chondroitin sulfate observed in this experimental model could be related to the mechanisms involved in the glomerulosclerosis and proteinuria that occur in CRF.


Subject(s)
Glycosaminoglycans/metabolism , Kidney Failure, Chronic/metabolism , Kidney/metabolism , Animals , Glycosaminoglycans/urine , Kidney Failure, Chronic/urine , Male , Rats , Rats, Wistar , Tissue Distribution
2.
Glycobiology ; 10(2): 185-92, 2000 Feb.
Article in English | MEDLINE | ID: mdl-10642610

ABSTRACT

Diabetes mellitus was induced in one group of rats by a single injection of streptozotocin. The glycemia, the body weight, and the blood systolic pressure were measured every week, and the 24 h urine volume and urinary excretions of creatinine, albumin and glycosaminoglycans were measured every 2 weeks. At the end of the experiment (12 weeks) the weight and the glycosaminoglycan composition of the kidneys were determined. All the diabetic animals were hyperglycemic, hypertense, and did not gain weight during all the experimental period. Albuminuria appeared from the second week on. Rat urine was shown to contain heparan sulfate, chondroitin sulfate, and dermatan sulfate, and the glycosaminoglycan excretion decreased in all diabetic animals. The onset of the change in glyco-samino-glycan excretion rate was a very early event, appearing in the second week after diabetes induction. The main glycosaminoglycan found in normal rat kidney was heparan sulfate and, in contrast to the urine, the total kidney glycosaminoglycans increased in diabetic kidney, due to chondroitin sulfate and dermatan sulfate accumulation. The heparan sulfate concentration (per tissue dry weight) did not change. Our results suggest that quantification of urinary glycosaminoglycans may be a useful tool for the early diagnosis of diabetic nephropathy.


Subject(s)
Albuminuria , Diabetes Mellitus, Experimental/urine , Glycosaminoglycans/urine , Kidney/metabolism , Animals , Chondroitin Sulfates/analysis , Chondroitin Sulfates/metabolism , Chondroitin Sulfates/urine , Dermatan Sulfate/analysis , Dermatan Sulfate/metabolism , Dermatan Sulfate/urine , Diabetes Mellitus, Experimental/metabolism , Glycosaminoglycans/analysis , Glycosaminoglycans/metabolism , Heparitin Sulfate/analysis , Heparitin Sulfate/metabolism , Heparitin Sulfate/urine , Kidney/chemistry , Male , Rats , Rats, Wistar , Reference Values , Time Factors
3.
Rev. argent. cardiol ; 64(supl. 4): 74-80, 1996. tab, graf
Article in Spanish | LILACS | ID: lil-194143

ABSTRACT

Fueron estudiados 24 pacientes hipertensos con obesidad androide, sin intolerancia a la glucosa, con índice de masa corporal entre 25 y 35 kg/m2, con presión arterial diastólica superior a 95 mmHg e inferior a 115 mmHg, después de ocho semanas sin tratamiento farmacológico. Los pacientes fueron divididos en dos grupos de 12 pacientes y después de 4 semanas de administración de placebo recibieron amlodipina (5-10 mg/día) o propranolol (160-320 mg/día). Se realizó una prueba de sensibilidad a la insulina al término del período placebo y después de 20 semanas de tratamiento. Los niveles de presión se redujeron de manera semejante en los dos grupos. Antes del tratamiento con droga activa los dos grupos no diferían en cuanto al índice de sensibilidad a la insulina. El tratamiento con propranolol provocó una reducción significativa del índice de sensibilidad a la insulina (0,34 ñ 0,16 versus 0,23 ñ 0,09; p<0,05), mientras tal índice se mantuvo inalterado en el grupo tratado con amlodipina (0,33 ñ 0,29 versus 0,30 ñ 0,18; no significativo). El tratamiento de los pacientes hipertensos esenciales con propranolol resultó en un empeoramiento de la sensibilidad a la insulina, mientras la amlodipina no tuvo tal influencia deletérea


Subject(s)
Humans , Adult , Middle Aged , Amlodipine/administration & dosage , Amlodipine/pharmacology , Amlodipine/therapeutic use , Antihypertensive Agents/administration & dosage , Antihypertensive Agents/pharmacology , Antihypertensive Agents/therapeutic use , Hypertension/drug therapy , Hypertension/therapy , Insulin , Obesity , Propranolol/administration & dosage , Propranolol/pharmacology , Propranolol/therapeutic use , Body Weight , Brazil , Risk Factors
4.
Rev. argent. cardiol ; 64(supl. 4): 74-80, 1996. tab, graf
Article in Spanish | BINACIS | ID: bin-20923

ABSTRACT

Fueron estudiados 24 pacientes hipertensos con obesidad androide, sin intolerancia a la glucosa, con índice de masa corporal entre 25 y 35 kg/m2, con presión arterial diastólica superior a 95 mmHg e inferior a 115 mmHg, después de ocho semanas sin tratamiento farmacológico. Los pacientes fueron divididos en dos grupos de 12 pacientes y después de 4 semanas de administración de placebo recibieron amlodipina (5-10 mg/día) o propranolol (160-320 mg/día). Se realizó una prueba de sensibilidad a la insulina al término del período placebo y después de 20 semanas de tratamiento. Los niveles de presión se redujeron de manera semejante en los dos grupos. Antes del tratamiento con droga activa los dos grupos no diferían en cuanto al índice de sensibilidad a la insulina. El tratamiento con propranolol provocó una reducción significativa del índice de sensibilidad a la insulina (0,34 ñ 0,16 versus 0,23 ñ 0,09; p<0,05), mientras tal índice se mantuvo inalterado en el grupo tratado con amlodipina (0,33 ñ 0,29 versus 0,30 ñ 0,18; no significativo). El tratamiento de los pacientes hipertensos esenciales con propranolol resultó en un empeoramiento de la sensibilidad a la insulina, mientras la amlodipina no tuvo tal influencia deletérea (AU)


Subject(s)
Humans , Adult , Middle Aged , Amlodipine/administration & dosage , Amlodipine/pharmacology , Amlodipine/therapeutic use , Propranolol/administration & dosage , Propranolol/pharmacology , Propranolol/therapeutic use , Antihypertensive Agents/administration & dosage , Antihypertensive Agents/pharmacology , Antihypertensive Agents/therapeutic use , Insulin , Hypertension/drug therapy , Hypertension/therapy , Obesity , Body Weight , Risk Factors , Brazil
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