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12 resultados
Production of an inhibitor of rat mesangial cell growth by the glomerulus and its alteration in puromycin nephrosis.
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Mesangial cell proliferation is found in many forms of progressive renal disease. This proliferation may be due to dysregulation of mesangial cell growth. The studies presented here test the hypothesis that the normal glomerulus produces a regulator of mesangial cell growth. Conditioned media (CM)
Urine protease and antiprotease activity in experimental aminonucleoside nephrotoxicity.
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Induction of nephrosis in rats with aminonucleoside of puromycin (ANP) was followed by an increase in urinary protease activity, measured by the cleavage of 14C-globin, as well as in antiprotease activity measured by trypsin inhibition. The excretion of protease and protease inhibitor coincided with
Thrombin-Induced Podocyte Injury Is Protease-Activated Receptor Dependent.
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Nephrotic syndrome is characterized by massive proteinuria and injury of specialized glomerular epithelial cells called podocytes. Studies have shown that, whereas low-concentration thrombin may be cytoprotective, higher thrombin concentrations may contribute to podocyte injury. We and others have
MAP-LC3, a promising autophagosomal marker, is processed during the differentiation and recovery of podocytes from PAN nephrosis.
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Microtubule-associated protein 1 light chain 3 (LC3) is a unique modifier protein. LC3-I, the cytosolic form, is modified to LC3-II, the membrane-bound form, by a mechanism similar to ubiquitylation by E1- and E2-like enzymes, Apg7p and Apg3p, respectively. In the present study, we found that LC3-I
Urinary serine proteases and activation of ENaC in kidney--implications for physiological renal salt handling and hypertensive disorders with albuminuria.
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Serine proteases, both soluble and cell-attached, can activate the epithelial sodium channel (ENaC) proteolytically through release of a putative 43-mer inhibitory tract from the ectodomain of the γ-subunit. ENaC controls renal Na(+) excretion and loss-of-function mutations lead to low blood
Identification of the lymphokine soluble immune response suppressor in urine of nephrotic children.
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Patients with minimal change nephrotic syndrome (MCNS) frequently have suppressed in vivo and in vitro immune responsiveness of uncertain etiology. Because increased suppressor cell activity has been associated with this disease, urines from MCNS patients were screened for activity of the lymphokine
Targeted enzyme therapy of experimental glomerulonephritis in rats.
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We sought to determine whether systemic administration of proteases ameliorates membranous nephritis induced in rats by immunization and challenge with cationic bovine gamma globulin, and whether targeting of protease to glomerular capillaries increases efficacy. Proteases substituted with biotin
Interaction of glucocorticoid hormones with rat skeletal muscle: catabolic effects and hormone binding.
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The mechanism of action of glucocorticoid hormones on rat skeletal muscle was studied by following their effect on muscle weight, free amino acid content, activity of amino acid-metabolizing enzymes, and binding to cytoplasmic receptor proteins. A significant reduction of gastrocnemius muscle and
Failure of antioxidant therapy to attenuate interstitial disease in rats with reversible nephrotic syndrome.
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The present two studies were designed to determine whether oxidized LDL contributes to the tubulointerstitial changes seen in rats during the acute phase of acute puromycin aminonucleoside nephrosis (PAN). In the single-dose study, rats were given one injection of puromycin aminonucleoside (PA; 15
Nephrotoxicity related to new therapeutic compounds.
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Toxic nephropathy is an important cause of reversible renal injury. This article focuses on the nephrotoxicity of several new therapeutic compounds. Selective cyclooxygenase-2 inhibitor is associated with sodium retention, hypertension, ankle edema, and acute renal failure. The incidence of renal
Drug-induced renal failure: update on new medications and unique mechanisms of nephrotoxicity.
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Medications cause renal failure through a variety of mechanisms. Hemodynamic renal failure may result from drugs that reduce renal prostaglandins and hence renal blood flow and glomerular filtration rate. A relatively new group of drugs with this potential is the cyclooxygenase-2 selective
Podocyte migration during nephrotic syndrome requires a coordinated interplay between cathepsin L and alpha3 integrin.
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Podocyte foot process effacement and disruption of the slit diaphragm are typically associated with glomerular proteinuria and can be induced in rats by the injection of puromycin aminonucleoside. Here, we show that the induction of puromycin aminonucleoside nephrosis involves podocyte migration
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