Abstract:
BACKGROUND:Urine is supersaturated in calcium oxalate, which means that it will contain calcium oxalate crystals that form spontaneously. Their size must be controlled to prevent retention in ducts and the eventual development of a lithiasis. This is achieved, in part, by specific inhibitors of crystal growth. We investigated whether promoters of crystal nucleation could also participate in that control, because for the same amount of salt that will precipitate from a supersaturated solution, increasing the number of crystals will decrease their average size and facilitate their elimination. METHODS:Albumin was purified from commercial sources and from the urine of healthy subjects or idiopathic calcium stone formers. Its aggregation properties were characterized by biophysical and biochemical techniques. Albumin was then either attached to several supports or left free in solution and incubated in a metastable solution of calcium oxalate. Kinetics of calcium oxalate crystallization were determined by turbidimetry. The nature and efficiency of nucleation were measured by examining the type and number of neoformed crystals. RESULTS:Albumin, one of the most abundant proteins in urine, was a powerful nucleator of calcium oxalate crystals in vitro, with the polymers being more active than monomers. In addition, nucleation by albumin apparently led exclusively to the formation of calcium oxalate dihydrate crystals, whereas calcium oxalate monohydrate crystals were formed in the absence of albumin. An analysis of calcium oxalate crystals in urine showed that the dihydrate form was present in healthy subjects and stone formers, whereas the monohydrate, which is thermodynamically more stable and constitutes the core of most calcium oxalate stones, was present in stone formers only. Finally, urinary albumin purified from healthy subjects contained significantly more polymers and was a stronger promoter of calcium oxalate nucleation than albumin from idiopathic calcium stone formers. CONCLUSIONS:Promotion by albumin of calcium oxalate crystallization with specific formation of the dihydrate form might be protective, because with rapid nucleation of small crystals, the saturation levels fall; thus, larger crystal formation and aggregation with subsequent stone formation may be prevented. We believe that albumin may be an important factor of urine stability.
journal_name
Kidney Intjournal_title
Kidney internationalauthors
Cerini C,Geider S,Dussol B,Hennequin C,Daudon M,Veesler S,Nitsche S,Boistelle R,Berthézène P,Dupuy P,Vazi A,Berland Y,Dagorn JC,Verdier JMdoi
10.1046/j.1523-1755.1999.00426.xsubject
Has Abstractpub_date
1999-05-01 00:00:00pages
1776-86issue
5eissn
0085-2538issn
1523-1755pii
S0085-2538(15)46133-2journal_volume
55pub_type
杂志文章abstract::The thick ascending limb of Henle's loop ( TAL ) develops a specific and consistent structural lesion during perfusion of the isolated rat kidney that progresses from mitochondrial swelling at 15 min to complete cellular disruption at 90 min. Because it seemed possible that damage localized to this metabolically activ...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.1984.9
更新日期:1984-01-01 00:00:00
abstract:BACKGROUND:The superiority of renin-angiotensin system (RAS) blockade in providing renoprotection has been attributed to class-specific blood pressure "(BP)-independent" mechanisms. However, the conventional BP measurement methodology on which such conclusions are based is inherently limited for an accurate assessment ...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1046/j.1523-1755.2000.00009.x
更新日期:2000-04-01 00:00:00
abstract::Transient renal tubular acidosis may complicate acute renal failure (ARF). To clarify this phenomenon, the present study examined tubular H+ ion secretory capacity in an ischemic model of ARF. Clearance studies were performed in dogs subjected to 60 minutes, unilateral renal artery clamping. The contralateral kidney s...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.1986.271
更新日期:1986-12-01 00:00:00
abstract::Leucocyte interaction with other cells is facilitated by the adhesion molecules, leucocyte function-associated antigen-1 (LFA-1)-binding to intercellular adhesion molecule-1 (ICAM-1) and for T cells and natural killer (NK) cells the binding of LFA-2 (CD2) to LFA-3. As these interactions are critical for the mediation ...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.1989.303
更新日期:1989-12-01 00:00:00
abstract:BACKGROUND:Wegener's granulomatosis (WG) is a rare systemic autoimmune disease characterized by small-vessel vasculitis leading to organ damage and the presence of antineutrophil cytoplasmic autoantibodies (ANCAs). ANCAs were shown to be involved in the pathogenesis of the disease by increasing adhesion of polymorphonu...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1046/j.1523-1755.2000.00430.x
更新日期:2000-12-01 00:00:00
abstract::Studies were undertaken to examine the mechanism whereby changes in intraluminal flow rates after reabsorption in the isolated perfused proximal tubule of the rabbit. All protocols employed the technique of in vitro perfusion of isolated segments of the proximal convoluted tubule. Stepwise elimination of d-glucose and...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.1977.3
更新日期:1977-01-01 00:00:00
abstract::We designed a study to provide reversibility and comparative injury data for several candidate urinary biomarkers of kidney injury in the United States Food and Drug Administration biomarker qualification process. The nephrotoxin gentamicin was given to rats once on each of three days and the animals were killed durin...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.2010.463
更新日期:2011-06-01 00:00:00
abstract::As new components of the renin-angiotensin system (RAS) are elucidated, our understanding of the complexities of their interactions also advances. Previous studies have determined that podocytes possess a local RAS that can generate angiotensin II. Podocytes have also been shown to express angiotensin-converting enzym...
journal_title:Kidney international
pub_type: 评论,杂志文章
doi:10.1038/ki.2012.127
更新日期:2012-08-01 00:00:00
abstract:BACKGROUND:Although peritoneal dialysis (PD) is a widely accepted form of renal replacement therapy (RRT), concerns remain regarding the bioincompatible nature of standard PD fluid. In order to evaluate whether a newly formulated fluid of neutral pH, and containing low levels of glucose degradation products (GDP), resu...
journal_title:Kidney international
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.1111/j.1523-1755.2004.00747.x
更新日期:2004-07-01 00:00:00
abstract::Micropuncture studies were carried out in surface nephrons of rats with nephrotoxic-serum (NTS)-induced nephrotic syndrome during a period of active sodium and water retention. It was found that hydrostatic pressure and tubular diameter were increased in the proximal tubules (13.4 +/- 0.2 vs. 10.4 +/- 0.2 mm Hg; 31.3 ...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.1979.166
更新日期:1979-11-01 00:00:00
abstract:BACKGROUND:Angiotensin II (Ang II) can up-regulate nicotinamide adenine dinucleotide phosphate [NAD(P)H] oxidase, whose product superoxide anion (O2-) can interact with nitric oxide (NO) to form peroxynitrite (ONOO-). We tested the hypothesis that Ang II subtype 1 (AT1) receptor activation enhances oxidative stress and...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1046/j.1523-1755.2002.00123.x
更新日期:2002-01-01 00:00:00
abstract::These studies were undertaken to examine effects of elevated glucose levels on glycolysis, sorbitol pathway activity, and the cytosolic redox state of NADH/NAD+ in isolated glomeruli. Blood-free glomeruli were isolated from kidneys of male, Sprague-Dawley rats using standard sieving techniques, then incubated for one ...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.1992.121
更新日期:1992-04-01 00:00:00
abstract::One reason for the inadequacy of current renoprotective therapy and the persistent poor renal prognosis in diabetic nephropathy is the large interindividual variation in response to treatment. Genetic as well as non-genetic factors are known to influence treatment efficacy. This Commentary summarizes the impact of the...
journal_title:Kidney international
pub_type: 评论,杂志文章
doi:10.1038/sj.ki.5000283
更新日期:2006-04-01 00:00:00
abstract::Ravulizumab is a long-acting C5 inhibitor engineered from eculizumab with increased elimination half-life, allowing an extended dosing interval from two to eight weeks. Here we evaluate the efficacy and safety of ravulizumab in adults with atypical hemolytic uremic syndrome presenting with thrombotic microangiopathy. ...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1016/j.kint.2020.01.035
更新日期:2020-06-01 00:00:00
abstract:BACKGROUND:The renal 11beta-hydroxysteroid dehydrogenase type 2 (11beta HSD2) enzyme inactivates 11-hydroxy steroids in the kidney, thereby protecting the nonselective mineralocorticoid (MR) receptor from occupation by glucocorticoids. Loss-of-function mutations in the gene encoding 11beta HSD2 (HSD11B2) result in over...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1111/j.1523-1755.2005.67119.x
更新日期:2005-02-01 00:00:00
abstract:UNLABELLED:The paracellular permeability of opossum kidney cells, a proximal tubule cell line. BACKGROUND:The regulation of the unusually leaky paracellular pathway of the proximal tubule is poorly understood partially because of the lack of an appropriate in vitro cell model. In this study, we determined whether the ...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1046/j.1523-1755.1999.00787.x
更新日期:1999-12-01 00:00:00
abstract::Vascular endothelial growth factor (VEGF) and transforming growth factor-β1 (TGF-β1) are key mediators of adverse peritoneal membrane remodeling in peritoneal dialysis eventually leading to ultrafiltration failure. Both are pleiotropic growth factors with cell type-dependent regulation of expression and biological eff...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.2013.217
更新日期:2013-12-01 00:00:00
abstract::Exosomes are small membrane vesicles that are secreted from a variety of cell types into various body fluids including the blood and urine. These vesicles are thought to play a role in cell-cell interactions. CD24 is a small but extensively glycosylated protein linked to the cell surface by means of a glycosyl-phospha...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/sj.ki.5002486
更新日期:2007-11-01 00:00:00
abstract::The importance of the relationship between the alteration of podocytic processes (PP) and proteinuria has been controversial for almost 30 years. In spite of several morphometric studies the range of PP alterations in different proteinuric conditions has gone unnoticed. Thus, we studied the distribution of abnormally ...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.1987.269
更新日期:1987-11-01 00:00:00
abstract:BACKGROUND:We have previously reported that the serum concentration of 2-(alpha-mannopyranosyl)-L-tryptophan (MPT), tryptophan glycoconjugate, is a more accurate measure of renal function than that of serum creatinine concentration. The aim of the present study was to compare the diagnostic value of serum concentration...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1111/j.1523-1755.2004.00521.x
更新日期:2004-04-01 00:00:00
abstract:BACKGROUND:Fructose is a nutrient as well as a potent agent for the formation of advanced glycation end product in diabetes. GLUT5 is a facilitated-diffusion fructose transporter expressed in the small intestine and kidney. Previous reports on the localization of GLUT5 by in situ hybridization and immunohistochemistry ...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1046/j.1523-1755.1999.00635.x
更新日期:1999-09-01 00:00:00
abstract::Neutrophil gelatinase-associated lipocalin (Ngal, 24p3, SIP24, lipocalin 2, or siderocalin) was originally purified from neutrophils, but with unknown function. Recently, it was identified that Ngal activates nephron formation in the embryonic kidney, is rapidly and massively induced in renal failure and possesses kid...
journal_title:Kidney international
pub_type: 杂志文章,评审
doi:10.1038/sj.ki.5002165
更新日期:2007-05-01 00:00:00
abstract::Lysyl oxidase like-2 (LOXL2) is an amine oxidase with both intracellular and extracellular functions. Extracellularly, LOXL2 promotes collagen and elastin crosslinking, whereas intracellularly, LOXL2 has been reported to modify histone H3, stabilize SNAIL, and reduce cell polarity. Although LOXL2 promotes liver and lu...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1016/j.kint.2018.02.024
更新日期:2018-08-01 00:00:00
abstract:BACKGROUND:High-dose folinic acid is used to accelerate methotrexate elimination to avoid renal toxicity of the drug. The present study was carried out to examine the role of the renal organic anion transporters OAT-K1 and OAT-K2 in the urinary excretion of methotrexate, especially in the methotrexate-folinic acid resc...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1046/j.1523-1755.2001.0600031058.x
更新日期:2001-09-01 00:00:00
abstract::Intrarenal angiotensin II is increased in kidney diseases independently of plasma angiotensin II and is thought to promote progressive deterioration of renal architecture. Here we investigated the mechanism of enhanced renal angiotensin II generation in kidney glomerular diseases. For this, kidney- or liver-specific a...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.2013.453
更新日期:2014-05-01 00:00:00
abstract::Epidermal growth factor receptor (EGFR) is a receptor tyrosine kinase. Its activation results in beneficial or detrimental consequences, depending on the particular setting. Earlier studies in the animal model of acute kidney injury showed that EGFR activation promotes renal tubular cell proliferation. Activation of E...
journal_title:Kidney international
pub_type: 杂志文章,评审
doi:10.1038/ki.2012.435
更新日期:2013-05-01 00:00:00
abstract::Transgenic rats [TGR; strain name TGR(mRen2)27] harboring the mouse Ren-2 renin gene have been recently generated as a model for the study of primary hypertension that offers the advantage of a clearly-defined genetic alteration. Expression of the mouse Ren-2 gene causes severe hypertension (200 to 260 mm Hg) which is...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.1992.4
更新日期:1992-01-01 00:00:00
abstract::We have analyzed the protein content of proximal tubular fluid (PTF) by ultramicro disc electrophoresis and measured total protein excretion rates both in control conditions and during angiotensin infusion to the rat. Under control conditions PTF albumin concentration was 1.49 +/- 1.12 (SD) mg/100 ml and did not incre...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.1975.83
更新日期:1975-08-01 00:00:00
abstract::Fibrillary glomerulonephritis (FGN) is a rare glomerular disease. Kidney biopsy is required to establish the diagnosis. Recent studies have identified abundant glomerular deposition of DNAJB9 as a unique histological marker of FGN. We developed an immunoprecipitation-based multiple reaction monitoring method to measur...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1016/j.kint.2019.01.024
更新日期:2019-05-01 00:00:00
abstract::The beneficial effects of post-insult administration of pentoxifylline, a novel hemorheologic agent experimentally studied in various ischemic diseases, were evaluated in two models of acute renal failure (ARF): direct nephrotoxicity (mercuric chloride 4 mg/kg via femoral vein) and hemoglobinuria (glycerol 10 ml/kg i....
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.1989.218
更新日期:1989-09-01 00:00:00