Abstract:
BACKGROUND:It is still unclear whether age per se is associated with preservation of renal functional reserve, that is, of the increase in glomerular filtration rate (GFR) induced by appropriate vasodilating stimulus. METHODS:To gain insights into this issue, we evaluated the renal response to a maximal vasodilating stimulus, represented by the combined infusion of mixed amino acid solution (AA) and dopamine at renal dose (D), in 10 young subjects (median age of 30 years, range of 19 to 32) and in 11 subjects of older age (median age of 67 years, range of 65 to 76). Two further age-matched groups of young (N = 15) and older (N = 11) living kidney donors underwent renal needle biopsy immediately before nephrectomy to perform semiquantitative scoring (0 to 3) of arteriosclerosis in intrarenal arteries. All of the study subjects were nonsmokers with healthy status proven by extensive diagnostic evaluation excluding any risk factor of renal dysfunction. RESULTS:Basal renal plasma flow (RPF) and GFR were proportionally lower in older subjects (RPF, 361 +/- 29 vs. 618 +/- 34 mL/min/1.73 m(2), P < 0.001; GFR, 79 +/- 4 vs. 127 +/- 5.8 mL/min/1.73 m(2), P < 0.001). After AA + D, a significant increase of RPF and GFR was observed in both groups, but the older subjects exhibited a smaller percentage increment (RPF, 25.5 +/- 4.8 vs. 42.4 +/- 5.8, P < 0.05; GFR, 19.6 +/- 5.7 vs. + 33.8 +/- 6.4, P < 0.05). Furthermore, the maximal vasodilating stimulus was not able to restore renal hemodynamics in older subjects to the level measured in young controls at baseline. Renal vascular resistances were higher (P < 0.05) in the older subjects both at baseline (0.19 +/- 0.02 vs. 0.09 +/- 0.004 mm Hg/mL/min) and after AA + D (0.14 +/- 0.01 vs. 0.06 +/- 0.004). Light microscopy examination detected the presence of a greater degree of arteriosclerosis at the level of interlobular and arcuate arteries (0.89 +/- 0.15 vs. 0.45 +/- 0.08) and interstitial fibrosis/tubular atrophy (1.18 +/- 0.13 vs. 0.53 +/- 0.13) in older than in young subjects. CONCLUSIONS:Therefore, aging has adverse effects on renal function despite the absence of any risk factor for renal disease, including chronic smoking: (1) GFR and RPF are lower, and (2) the renal response to maximal vasodilating stimulus is impaired. These aging-related alterations of renal hemodynamics are possibly due to organic lesions in renal vasculature.
journal_name
Kidney Intjournal_title
Kidney internationalauthors
Fuiano G,Sund S,Mazza G,Rosa M,Caglioti A,Gallo G,Natale G,Andreucci M,Memoli B,De Nicola L,Conte Gdoi
10.1046/j.1523-1755.2001.0590031052.xsubject
Has Abstractpub_date
2001-03-01 00:00:00pages
1052-8issue
3eissn
0085-2538issn
1523-1755pii
S0085-2538(15)47567-2journal_volume
59pub_type
杂志文章abstract::Lysophosphatidic acid (LPA) is known to regulate various biological responses by binding to LPA receptors. The serum level of LPA is elevated in diabetes, but the involvement of LPA in the development of diabetes and its complications remains unknown. Therefore, we studied LPA signaling in diabetic nephropathy and the...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1016/j.kint.2016.11.010
更新日期:2017-06-01 00:00:00
abstract::Hydrogen sulfide has recently been found decreased in chronic kidney disease. Here we determined the effect and underlying mechanisms of hydrogen sulfide on a rat model of unilateral ureteral obstruction. Compared with normal rats, obstructive injury decreased the plasma hydrogen sulfide level. Cystathionine-β-synthas...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.2013.449
更新日期:2014-06-01 00:00:00
abstract:BACKGROUND:It is known that chronic renal insufficiency (CRI) patients with gout may have subtle lead poisoning. In addition, gout episodes frequently aggravate progressive renal insufficiency because of the use of nephrotoxic drugs and urate deposition. Our study was arranged to evaluate the causal effect of environme...
journal_title:Kidney international
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1046/j.1523-1755.2001.00795.x
更新日期:2001-07-01 00:00:00
abstract::Metabolic changes due to chronic renal failure (CRF) were studied in isolated liver cells. In 14 CRF and 14 sham-operated rats, liver cells were isolated by the Berry and Friend method and incubated with various substrates in order to study gluconeogenesis, ureagenesis, ketogenesis, oxygen consumption as well as cytos...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.1995.215
更新日期:1995-06-01 00:00:00
abstract::Recent studies suggest that postnatal neovascularization relies not exclusively on sprouting of preexisting vessels ("angiogenesis"), but also involves the contribution of bone marrow-derived circulating endothelial progenitor cells (EPCs). EPCs can be isolated from peripheral blood or bone marrow mononuclear cells, C...
journal_title:Kidney international
pub_type: 杂志文章,评审
doi:10.1111/j.1523-1755.2005.00261.x
更新日期:2005-05-01 00:00:00
abstract:BACKGROUND:Microalbuminuria (MA) is a strong predictor of cardiovascular disease, but its causes are incompletely understood. Hyperhomocysteinemia is a recently recognized risk factor for cardiovascular disease independent of established risk factors. It is not known whether hyperhomocysteinemia is associated with MA, ...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/sj.ki.4495353
更新日期:1998-07-01 00:00:00
abstract::Recent evidence suggesting a strong interplay between components of the renin-angiotensin system and key mediators of fibrosis led us to hypothesize that renin, independent of its enzymatic action to enhance angiotensin (Ang) II synthesis, directly increases production of the fibrogenic cytokine transforming growth fa...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/sj.ki.5000011
更新日期:2006-01-01 00:00:00
abstract::In adults on chronic hemodialysis, achieving a hemoglobin concentration of 12g/dl and above with erythropoiesis stimulating agents leads to increased cardiovascular events and mortality, but this may not be true in children. Therefore, we conducted a retrospective cohort study of pediatric patients (under 18) from the...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1016/j.kint.2016.09.013
更新日期:2017-01-01 00:00:00
abstract::Treatment of mesangial cells with recombinant human interleukin 1 beta (IL-1 beta) triggers the expression of a macrophage-type of nitric oxide (NO) synthase and the subsequent increase of cellular concentration of cGMP and nitrite production. Tetrahydrobiopterin (BH4) is an essential cofactor for NO synthase, and in ...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.1994.398
更新日期:1994-11-01 00:00:00
abstract::Protein-bound uremic toxins (PBUTs) accumulate in chronic kidney disease (CKD) and are poorly removed by dialysis. Gryp et al. demonstrated that fecal bacteria from patients with CKD do not produce more PBUTs than do those from healthy controls and that the accumulation of PBUTs, as CKD progresses, is mainly due to th...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1016/j.kint.2020.02.026
更新日期:2020-06-01 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::Acid (H+) retention appears to contribute to progressive decline in glomerular filtration rate (GFR) in patients with chronic kidney disease (CKD), including some patients without metabolic acidosis. Identification of patients with H+ retention but without metabolic acidosis could facilitate targeted alkali therapy; h...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1016/j.kint.2018.11.033
更新日期:2019-05-01 00:00:00
abstract::Aldosterone exerts its biological effects through binding to mineralocorticoid receptor (MR). Ligand binding induces a receptor transconformation within the ligand-binding domain and dissociation of associated proteins from the receptor. The ligand-activated receptor binds as a dimer to the response elements present i...
journal_title:Kidney international
pub_type: 杂志文章,评审
doi:10.1046/j.1523-1755.2000.00958.x
更新日期:2000-04-01 00:00:00
abstract::Autosomal dominant polycystic kidney disease (ADPKD) is characterized by progressive enlargement of kidney cysts leading to chronic kidney disease (CKD) and end-stage renal disease (ESRD). Identification of an early biomarker that can predict progression of CKD is urgently needed. In an earlier Consortium for Radiolog...
journal_title:Kidney international
pub_type: 杂志文章,多中心研究
doi:10.1016/j.kint.2017.09.027
更新日期:2018-03-01 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::Growth failure is a cardinal feature of chronic renal failure in children. Administration of recombinant human growth hormone (rhGH) ameliorates this problem but may adversely affect the kidney and hasten the progression to end-stage renal disease. We conducted experiments to examine the impact of rhGH on the severity...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.1993.380
更新日期:1993-12-01 00:00:00
abstract:BACKGROUND:While metabolically generated oxidants are produced locally in experimental glomerular diseases, little is still known of their significance and the respective scavenger systems in human glomerular diseases. METHODS:Here we studied kidneys from patients with congenital nephrotic syndrome of the Finnish type...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1046/j.1523-1755.2001.059002481.x
更新日期:2001-02-01 00:00:00
abstract:BACKGROUND:Previous experiments from our laboratory have demonstrated that HKalpha(2) coimmunoprecipitated with beta(1)-Na(+),K(+)-ATPase. Although HKalpha(2) is expressed abundantly in the apical membrane of distal colon, the demonstration that beta(1) localizes to this same membrane in distal colon has not been demon...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1111/j.1523-1755.2004.00856.x
更新日期:2004-09-01 00:00:00
abstract::The content of platelet activating factor (PAF) in glomeruli isolated from rats with nephrotoxic serum glomerulonephritis (NSGN) was quantified at various stages of the disease and the role of complement, platelets and neutrophils in mediating changes in glomerular PAF levels was evaluated. PAF content was assessed fo...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.1990.40
更新日期:1990-02-01 00:00:00
abstract::Peptides representing potential antigenic regions of the NC-1 and 7-S domains of the human alpha 1 and alpha 2, and bovine alpha 3 chains of type IV collagen were synthesized either chemically or by the recombinant DNA technique and tested by ELISA using antibodies raised in rabbits against the whole type IV collagen ...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.1993.16
更新日期:1993-01-01 00:00:00
abstract::Propofol has been shown to provide protection against renal ischemia/reperfusion injury experimentally, but clinical evidence is lacking. Here we studied the effect of propofol anesthesia on the occurrence of acute kidney injury following heart surgery with cardiopulmonary bypass. One hundred and twelve patients who u...
journal_title:Kidney international
pub_type: 杂志文章,随机对照试验
doi:10.1038/ki.2013.532
更新日期:2014-08-01 00:00:00
abstract::We evaluated short- and long-term effects of high-dose recombinant human erythropoietin (rHuEPO) in kidney transplantation in a prospective double-blind, placebo-controlled study. Patients with chronic kidney disease following receipt of a deceased donor kidney allograft were randomized to 3 doses of 40,000 units rHuE...
journal_title:Kidney international
pub_type: 杂志文章,随机对照试验
doi:10.1038/ki.2011.349
更新日期:2012-02-01 00:00:00
abstract::Amylin (islet amyloid peptide) plays a critical role in islet amyloidosis and in the development of beta-cell dysfunction in patients with diabetes; however, the involvement of amylin in renal amyloidosis has not been studied. For this reason, we surveyed 149 patients with biopsy-proven diabetic nephropathy (DN). The ...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/sj.ki.5002305
更新日期:2007-07-01 00:00:00
abstract::The acute renal effects of hypoxemia and the ability of theophylline to prevent these effects were assessed in anesthetized and mechanically-ventilated newborn and adult rabbits. Renal blood flow (RBF) and glomerular filtration rate (GFR) were determined by the clearance of para-aminohippuric acid and inulin, respecti...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.1988.114
更新日期:1988-06-01 00:00:00
abstract::Kidney fibrosis is the common consequence of chronic kidney diseases that inexorably progresses to end-stage kidney disease with organ failure treatable only with replacement therapy. Since transforming growth factor-β1 is the main player in the pathogenesis of kidney fibrosis, we posed the hypothesis that recombinant...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1016/j.kint.2020.05.041
更新日期:2020-11-01 00:00:00
abstract::Kidney transplant patients receiving phenytoin or phenobarbital may have decreased graft survival. These drugs have been shown to enhance the metabolism of glucocorticoids. We determined the disposition of total and unbound prednisolone in six stable kidney transplant patients receiving prednisone for immunosuppressio...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.1984.17
更新日期:1984-01-01 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::The effects of intravenous (i.v.) and intracarotid (IC) angiotensin II (AII) infusion on systemic and renal hemodynamics, renal water excretion, and plasma antidiuretic hormone (ADH) levels were examined in six conscious dogs under water loaded and hydropenic conditions. In the first group of seven studies, AII in a m...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/ki.1986.214
更新日期:1986-10-01 00:00:00
abstract::Diabetic nephropathy shows a higher incidence in male subjects, which may in part be owing to genetic factors. The angiotensin II type 2 receptor (AT2), present in the renal glomerulus, may oppose the deleterious effects of the type I receptor (AT1) through vasodilatation and growth inhibition. We determined whether t...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1038/sj.ki.5000348
更新日期:2006-05-01 00:00:00
abstract::Defective recycling of megalin consequent to impaired phosphatidylinositol metabolism has been implicated as a mechanism causing tubular proteinuria in patients with Lowe syndrome. In this issue, Berquez et al. describe an innovative approach using a clinically approved drug to "rebalance" phosphatidylinositols and re...
journal_title:Kidney international
pub_type: 杂志文章
doi:10.1016/j.kint.2020.06.018
更新日期:2020-10-01 00:00:00