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At least 1,099 records · Page 61Linked to original sources
PubMed2002

Reactive oxygen species: roles in blood pressure and kidney function.

Oxidative stress in blood vessels and the kidney in hypertension can be induced by diverse vasoconstrictor mechanisms, including blockade of nitric oxide synthase and activation of angiotensin II type I receptors and thromboxane receptors. It can cause vasoconstriction via bioinactivation of nitric oxide, and by nitric oxide synthase independent mechanisms that include increased generation of endothelin-1 and the effects of superoxide anion and hydrogen peroxide on vascular smooth muscle cells. Oxidative stress can accompany hypertension in many models including the spontaneously hypertensive rat, the angiotensin II-infused rat, renovascular hypertension, the deoxycorticosterone acetate-salt model, and obesity-related hypertension. In the kidney, NADPH oxidase-generating superoxide anion is expressed in the vasculature, interstitium, juxtaglomerular apparatus, and the distal nephron. Much progress has been made in defining the pathways that intervene between agonist stimulation of blood vessels and reactive oxygen species-mediated contractile and renal functional responses in animal models in hypertension.

Animals↗
PubMed1980

Methoxyethylmercury nephrotoxicity: effects on enzymuria and kidney function.

The fungicide, methoxyethylmercury chloride, was given in a saline solution to four groups of Sprague-Dawley C D rats (5 male, 5 female) as a single injection (IP) of 0, 0.5, 1.0, and 2.0 mg Hg/kg. In a three-day period, no changes were observed in urine collected every 24 h from rats given 0 or 0.5 mg Hg/kg; 1 mg Hg/kg induced only a transient increase of urine gamma glutamyl transferase (x 4) and alkaline phsophatase (x 2.5) on the day 2; 2.0 mg Hg/kg caused an early increase of enzymuria (day 1 and day 2) and a decrease of Na+, Cl-, K+, urea, and creatinin excretion. Urine enzymes and total mercury excretion were higher in males. These time-related variations of enzymuria, compared to previous results with Hg Cl2, could reflect the existence of metabolites more toxic than the native compound.

Alkaline Phosphatase↗
PubMed1985

The effect of pregnancy on kidney function in renal allograft recipients.

In women with renal transplants glomerular filtration rate (GFR) increases during pregnancy but how soon the increment occurs, its relation to pre-pregnancy GFR, and the overall pattern of change are unknown. Twenty-four hour creatinine clearance (24-hr CCr) were measured prospectively in ten pregnancies in eight allograft recipients before conception, throughout pregnancy, 8 to 12 weeks postpartum, and 4 to 6 monthly thereafter. Inulin (CIn) in creatinine (CCr) clearances during infusion were also determined and protein excretion was evaluated. The results were compared to those in similar studies in ten healthy women. By the tenth gestational week 24-hr CCr was 124 +/- (SD) 15.9 ml/min in healthy women (an increase of 38%; range, 18 to 69%) and in transplant patients was 105 +/- 28.1 ml/min (an increase of 34%: range, 10 to 60%), with the greatest increments in those whose allografts functioned best before conception, regardless of donor source and sex or the transplant-pregnancy interval. In late pregnancy mean 24-hr CCr decreased by 19% (range, 6 to 28%) in healthy women and by 34% (range, 12 to 57%) in the transplant patients, but in most this did not represent graft deterioration nor lead to permanent impairment. At all time points CIn values were 5 to 10% greater than those for 24-hr CCr but slightly less than infusion CCr values. Protein excretion increased throughout pregnancy and by the third trimester in healthy women averaged 200 mg in 24 hr and regularly exceeded 500 mg in 24 hr in transplant patients, which was three times non-pregnant levels and probably not clinically significant.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMedDate not supplied

[Beta 2 microglobulin in the serum as a parameter for the evaluation of kidney function in pregnant patients with EPH gestosis].

The renal function of 27 pregnant women with EPH-gestosis were determined by measuring the level of proteinuria, the serum concentration of blood-urea-n (BUN), creatinin, beta 2-microglobulin and the creatinin clearance, in comparison with, 39 healthy pregnant women were examined. For statistics the regressions line with the week of gestation and spearman correlation between our parameters (proteinuria, BUN, creatinin, creatinin clearance and gestosis-index) were determined. The level of the proteinuria as well as the concentration of BUN and serum-creatinin are only limited useful to check the degree of a restriction of the renal function in EPH gestosis. Significant correlations were found between beta 2-microglobulin concentration and the serum creatinin concentration as well as the creatinin clearance, but not between beta 2-microglobulin and the gestosis index. Immunologic reactions in EPH-gestosis seem not to have a significant influence on beta 2-microglobulin concentration, but only the restriction of the degree of the glomerular filtration. Therefore beta 2-microglobulin is a useful parameter for renal function.

Adult↗
PubMed1982

[Disorders of kidney function in hepatic coma].

Renal function was evaluated in 80 patients with hepatic coma stage III-IV (24 patients had acute fulminant hepatic failure, 48 patients chronic hepatic failure, 8 patients had a mixed form). Urea, creatinine and electrolytes were measured in plasma and urine as well as creatinine clearance and sodium/potassium ratio in urine. Renal failure was defined as an increase of serum creatinine above 3 mg/dl. In 15 of the 24 patients with fulminant hepatic failure creatinine clearance was reduced; hyperaldosteronism was present in 13 cases; in 2 patients there was necrosis of the tubulus, in 9 patients overt renal failure. In patients with chronic hepatic failure creatinine clearance was pathological in 36 cases, hyperaldosteronism was diagnosed in 23 cases and necrosis of renal tubules in 3 cases; 8 patients had overt renal failure. In the group with the mixed form of hepatic coma creatinine clearance was pathological in 3 cases, in 6 cases hyperaldosteronism was diagnosed; necrosis of the tubules could not be found in this group; 4 patients had overt renal failure. It is suggested that for treatment of this condition dopamine should be given prophylactically as well as intravenous sodium and water substitution.

Acute Kidney Injury↗
PubMed1989

Effect of carbohydrate intake on kidney function and structure in SHR/N-cp rats. A new model of NIDDM.

The SHR/N corpulent (cp) rat is a genetically obese rat that develops hyperglycemia, hyperinsulinemia, and proteinuria. This study was designed to evaluate the effects of high carbohydrate (CHO) intake on renal function and structure in this animal model and to determine whether the renal effects are related to the type of CHO ingested. Two groups of 5-wk-old obese male SHR/N-cp rats and lean male littermates were fed diets containing 54% CHO in the form of sucrose or starch. After 12 wk, renal function parameters, including creatinine clearance, urinary glucose excretion, and urinary protein excretion, were measured. Renal morphology was evaluated by semiquantitative light and electron microscopy. On either diet, obese rats had significantly higher urinary glucose and protein excretions than their lean littermates. Mean creatinine clearance (ml/min) in obese rats did not differ significantly from values observed in lean rats. When corrected for body weight, creatinine clearance (ml.min-1.kg-1) tended to be lower in obese than in lean rats, but the difference was significant (P less than .02) only for obese and lean sucrose-fed animals. Obese rats fed sucrose compared with their obese counterparts fed starch had higher body weight (+8%, P less than .05), glucose excretion (+63%, P less than .02), and protein excretion (+242%, P less than .005). In obese rats, protein excretion correlated with glucose excretion (r = .71, P less than .01). Glomerular lesions consisting of mesangial expansion and intercapillary nodules were found in obese but not in lean rats. Moreover, obese rats fed sucrose had a significantly greater number of involved glomeruli than obese rats fed starch.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1991

Life-threatening post-nephrolithotomy hemorrhage resulting in cessation of kidney function, treated by transcatheter arterial embolization with subsequent restoration of excretory function.

A massive post-nephrolithotomy renal hemorrhage was successfully controlled by selective arterial embolization using Gelfoam particles. Prior to embolization, the kidney showed no excretory function due to complete obstruction of its collecting system by blood clots. Long-term observation revealed restoration of excretory function of the treated kidney and only minimal loss of its parenchyma.

Adult↗