Abstract：
:Absorption of amino acids by the necturus proximal tubules was measured under free-flow conditions The coexistence of proximal tubular amino acid influx was determined by infusing saline into tubular lumens by the stopped-flow microperfusion technique. Under free-flow conditions, fractional absorption of individual amino acids ranged from 0.30 +/- 0.18 (glutamic acid) to 0.96 +/- 0.02 (proline), with 14 of 19 values greater than 0.75. The transport avidity for a given amino acid bore no relationship to its molecular weight, transport class, or plasma concentration. The values obtained for tubular fluid/plasma (TF/P) were very comparable to those reported for the rat. In stopped-flow microperfusion experiments, samples of isotonic saline residing in tubule lumens for 20 min were found to contain all the amino acids present in plasma (filtrate). The concentrations of all except the acidic anionic pair, glutamic acid and aspartic acid, were remarkably similar to those obtained by collection of end proximal samples in free-flow studies. The very high concentrations of the acidic amino acids may reflect their passive distribution across the luminal cell membrane, active absorption having been impaired by the absence of some substance normally present in glomerular filtrate.
journal_name
Kidney Intjournal_title
Kidney internationalauthors
Oken DE,Weise Mdoi
10.1038/ki.1978.67subject
Has Abstractpub_date
1978-06-01 00:00:00pages
445-51issue
6eissn
0085-2538issn
1523-1755pii
S0085-2538(15)31904-9journal_volume
13pub_type
杂志文章abstract：:Because of differences in case-mix across states, state-level case-mix-adjusted end-stage renal disease (ESRD) incident rates are reported in each United States Renal Data System Annual Data Report to make the across-state comparisons valid. The adjusted rates were estimated by the direct adjustment method, a widely u...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/sj.ki.5000299
更新日期：2006-04-01 00:00:00
abstract：:The microvillus brush border on the renal proximal tubule epithelium allows the controlled reabsorption of solutes that are filtered through the glomerulus and thus participates in general body homeostasis. Here, using the lipid 5-phosphatase Ship2 global knockout mice, proximal tubule-specific Ship2 knockout mice, an...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1016/j.kint.2017.01.008
更新日期：2017-07-01 00:00:00
abstract：:Prostaglandin E2 (PGE2) may be an important negative feedback modulator of endothelin-1 (ET-1)-stimulated mesangial cell proliferation and contraction. Recent studies suggest that ET-1 may induce prolonged mesangial cell PGE2 production, however the mechanism of this effect is unknown. The current study was undertaken...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/ki.1995.6
更新日期：1995-01-01 00:00:00
abstract：:Insulin-like growth factor I (IGF-I) has been found in the kidney, particularly in the collecting duct in the rat. Since cultured rabbit collecting duct cells constitute a convenient system for in vitro studies, we have examined whether these cells secrete IGF-I. Culture medium conditioned by collecting duct cells was...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/ki.1991.3
更新日期：1991-01-01 00:00:00
abstract：BACKGROUND:We examined the effect of kidney disease (KD) on mortality in nondiabetic and diabetic Pima Indians aged > or = 45 years old. METHODS:Deaths and person-years of follow-up were stratified in a time-dependent fashion into categories of (1) no proteinuria and normal serum creatinine (SCr); (2) proteinuria and ...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1111/j.1523-1755.2005.00523.x
更新日期：2005-09-01 00:00:00
abstract：:Transplanted organs express allogeneic epitopes against which a recipient's immune system mounts a destructive response. In the absence of a reliable strategy for induction of donor-specific tolerance, therapeutic immunosuppression remains the best prospect to prevent rejection, but exposes recipients to increased ris...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/ki.2015.268
更新日期：2015-12-01 00:00:00
abstract：:We have studied acid-base balance in 32 patients attending the renal clinic of Mount Sinai Hospital. The parameters of acid-base balance measured included acid production measured as urinary sulfate and organic anions, net acid excretion measured as urinary ammonia plus titratable acid minus bicarbonate, and net GI ab...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/ki.1995.79
更新日期：1995-02-01 00:00:00
abstract：:Long-term complications of continuous immunosuppression still remain a serious threat and are currently drawing the attention of transplant physicians. Wimmer et al. show that malignancy occurs approximately fourfold more frequently in renal-transplant recipients than in a normal control population. Besides immunosupp...
journal_title：Kidney international
pub_type： 评论,杂志文章
doi：10.1038/sj.ki.5002306
更新日期：2007-06-01 00:00:00
abstract：:Autophagy is a dynamic and highly regulated process of self-digestion responsible for cell survival and reaction to oxidative stress. As oxidative stress is increased in uremia and is associated with vascular calcification, we studied the role of autophagy in vascular calcification induced by phosphate. In an in vitro...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/ki.2012.482
更新日期：2013-06-01 00:00:00
abstract：:We studied binding and degradation of vasoactive intestinal peptide (VIP) by highly purified brush border and basolateral membranes from rabbit kidney cortex. Brush border and basolateral membranes were capable of 73 and 49% degradation of VIP after 20 minutes, and the degradation was totally prevented by bacitracin. ...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/ki.1991.32
更新日期：1991-02-01 00:00:00
abstract：:Colony stimulating factor-1 (CSF-1) is a chemoattractant and growth factor for macrophages. In autoimmune MRL-lpr mice, CSF-1 is detected in the circulation and there is an increase in CSF-1 transcripts and macrophages in the kidney. The purpose of this study was to establish whether the MRL-lpr kidney is responsible ...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/ki.1996.9
更新日期：1996-01-01 00:00:00
abstract：:The effect of the tricarboxylic acid (TCA) cycle precursor, pyruvate, on glutamine metabolism by isolated renal cortical mitochondria was assessed by quantitating its key nitrogen and carbon metabolites. When mitochondria from normal rats were incubated at pH 7.4, pyruvate (2 mM) inhibited ammonia production by almost...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/ki.1982.166
更新日期：1982-09-01 00:00:00
abstract：:Here we studied a possible association between low parathyroid hormone (PTH) status and mortality in incident patients undergoing hemodialysis . A total of 1983 patients were included at baseline and prospectively followed for 24 months. Patients were classified according to their Kidney Disease: Improving Global Outc...
journal_title：Kidney international
pub_type： 杂志文章,多中心研究
doi：10.1016/j.kint.2015.12.001
更新日期：2016-03-01 00:00:00
abstract：:The hypertrophy of renal proximal tubular cells occurs as an adaptive response to a variety of stimuli and may be involved with the progression of renal disease. Angiotensin II acting alone or in combination with other growth factors has been implicated in this process. The aims of this study were to identify the role...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/ki.1997.385
更新日期：1997-09-01 00:00:00
abstract：:The relative importance of sarcopenia and its individual components as independent predictors of mortality in the dialysis population has not been determined. We estimated whole-body muscle mass using pre-dialysis bioimpedance spectroscopy measurements in 645 ACTIVE/ADIPOSE-enrolled prevalent hemodialysis patients fro...
journal_title：Kidney international
pub_type： 杂志文章,多中心研究
doi：10.1016/j.kint.2017.01.024
更新日期：2017-07-01 00:00:00
abstract：:Thrombotic microangiopathy (TMA) is a pattern of endothelial damage that can be found in association with diverse clinical conditions such as malignant hypertension. Although the pathophysiological mechanisms differ, accumulating evidence links complement dysregulation to various TMA syndromes and in particular the at...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1016/j.kint.2016.12.009
更新日期：2017-06-01 00:00:00
abstract：:Nephrin is a slit diaphragm protein critical for structural and functional integrity of visceral glomerular epithelial cells (podocytes) and is known to be tyrosine phosphorylated by Src family kinases. We studied the role of phosphoinositide 3-kinase (PI3K), activated via the phosphorylation of nephrin, in actin cyto...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/sj.ki.5002691
更新日期：2008-03-01 00:00:00
abstract：:Clofibrate, a peroxisome proliferator-activated receptor-alpha (PPAR alpha) agonist, increases renal tubular cytochrome P450 4a (Cyp4a) expression thereby increasing 20-hydroxyeicosatetraenoic acid (20-HETE) production. To determine if clofibrate affects blood pressure regulation we studied mice with DOCA-salt induced...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/ki.2008.300
更新日期：2008-10-01 00:00:00
abstract：:Isolated perfused rat kidneys were passively sensitized by addition of either mouse ascitic fluid containing monoclonal IgE against dinitrophenol (DNP) or DNP-specific purified IgE. After washing the organ, defined doses of DNP-bovine serum albumin were given as bolus injection via the kidney artery. Antigen challenge...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/ki.1987.197
更新日期：1987-08-01 00:00:00
abstract：:The plasminogen activators (PA), which are regulated by their specific inhibitor, PAI-1, convert the zymogen plasminogen to plasmin, a protease involved in fibrinolysis and extracellular matrix turnover. Interleukin 1 beta (IL-1) is a key cytokine released from infiltrating monocytes/macrophages during the initial sta...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/ki.1996.159
更新日期：1996-04-01 00:00:00
abstract：BACKGROUND:Hemodialysis access thrombosis is a significant cause of morbidity for hemodialysis patients and results from decreased access flow caused by venous outflow tract stenosis. Ultrasound dilution (UD) is a practical, noninvasive, and reliable indicator of access flow and is effective in predicting venous stenos...
journal_title：Kidney international
pub_type： 临床试验,杂志文章
doi：10.1046/j.1523-1755.2001.00753.x
更新日期：2001-06-01 00:00:00
abstract：:Superoxide (O2-) production and Fc alpha R antigen expression of circulating polymorphonuclear leukocytes (PMNL) isolated from patients with IgA nephropathy (IgAN) and non-IgA mesangial proliferative glomerulonephritis (PGN) and healthy volunteers were investigated to establish their biological importance in the immun...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/ki.1994.114
更新日期：1994-03-01 00:00:00
abstract：BACKGROUND:In the rat cortical thick ascending limb (CTAL), intracellular Ca2+ ([Ca2+]i) responses to angiotensin II (Ang II) and angiotensin III (Ang III) were mediated by the Ang II subtype 1A receptor (AT1A-R), whereas the arginine vasopressin (AVP)-dependent cAMP accumulation involved the vasopressin receptor type ...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1046/j.1523-1755.2002.00366.x
更新日期：2002-06-01 00:00:00
abstract：:Mineralocorticoid hormones stimulate Na+ absorption and K+ secretion by the cortical collecting tubule. There is good evidence that this stimulation involves increasing luminal membrane Na+ permeability and the turnover rate (or number) of the Na+-K+ pumps. These experiments were designed to examine whether mineraloco...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/ki.1985.177
更新日期：1985-10-01 00:00:00
abstract：:We sought to study glomerular pathophysiology in a model of IgA nephropathy (IgAN). Preliminary experiments with oral immunization indicated that Lewis rats had higher IgA levels and IgA/IgG ratios than Wistar, Fischer or Sprague-Dawley rats. Six groups of Lewis rats were studied: four continuously orally immunized fo...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/ki.1992.268
更新日期：1992-07-01 00:00:00
abstract：:The monoclonal antibody (mAb) 3G5 was found, by indirect immunofluorescence, to bind to renal cortical structures in frozen sections of human, rat and calf kidneys. Double indirect immunofluorescence studies on frozen sections of rat kidneys showed that 3G5 stained only the glomerulus and the distribution of the 3G5 a...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/ki.1992.236
更新日期：1992-06-01 00:00:00
abstract：:With a lifetime incidence of up to 12% in man and 6% in woman, nephrolithiasis is a major health problem worldwide. Approximately, 80% of kidney stones are composed of calcium and hypercalciuria is found in up to 40% of stone-formers. Although the mechanisms resulting in precipitation and growth of calcium crystals in...
journal_title：Kidney international
pub_type： 杂志文章,评审
doi：10.1038/sj.ki.5002441
更新日期：2007-11-01 00:00:00
abstract：BACKGROUND:Arteriovenous (AV) fistulas used for hemodialysis access may affect cardiac load by increasing the preload while decreasing the afterload. In dogs, AV fistulas have also been shown to affect coronary perfusion negatively. We investigated the net effect of AV fistulas on cardiac oxygen supply and demand. MET...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1046/j.1523-1755.1999.00433.x
更新日期：1999-05-01 00:00:00
abstract：:Recent studies have greatly expanded our knowledge of initial events that lead to epithelial cell polarity. Epithelial polarity is defined, in part, by apical cell-cell tight junctions that separate the plasma membrane into the apical domain and the basolateral domain, as well as the zonula adherens that mediate inter...
journal_title：Kidney international
pub_type： 杂志文章,评审
doi：10.1038/sj.ki.5002579
更新日期：2007-12-01 00:00:00
abstract：:Chronic cyclosporine (CsA) nephrotoxicity is a major complication of heart, bone marrow, and renal transplantation, and is characterized in humans by striped interstitial fibrosis, tubular dilatation and atrophy, and hyalinization of hilar arterioles. This last feature is highly specific for cyclosporine injury and ha...
journal_title：Kidney international
pub_type： 杂志文章
doi：10.1038/ki.1995.311
更新日期：1995-08-01 00:00:00
