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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Diabetologia 31 (1988), S. 639-646 
    ISSN: 1432-0428
    Keywords: Diabetic microangiopathy ; non-enzymatic glycosylation ; anti-albumin autoantibodies ; glucitollysine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The presence of antibodies to glycosylated albumin was studied by means of a newly developed sandwich enzyme-linked immunosorbent assay in 29 long-standing Type 1 (insulin-dependent) diabetic patients with microvascular complications and in 20 normal subjects. Two types of antibody reactivity were detected. One directed against glucitol-albumin expressing G and M isotypes. The second, predominantly belonging to the IgG class, reacted with an epitope shared by non-glycosylated albumin and the ketoamine adduct of albumin glycosylation. Both types of antibodies, with affinity constant ranging from 104 to 107 (mol/l)−1 were found in normal and diabetic subjects, but higher litres were significantly more prevalent in the diabetic patients. These antibodies may represent the result of immune tolerance breakdown or, alternatively, be natural antibodies. Although their function remains to be established, their raised prevalence in Type 1 diabetes may be relevant to diabetic microvascular disease.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0428
    Keywords: Insulin-dependent diabetes mellitus ; arterial hypertension ; borderline hypertension ; microalbuminuria ; diabetic nephropathy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Arterial hypertension and poor glycaemic control are central to the development of microalbuminuria in insulin-dependent diabetes mellitus (IDDM). Recent consensus has established sensitive criteria for their detection and treatment, although the proportion of patients who may benefit is unclear. Between 1988 and 1990, we measured urinary albumin to creatinine concentration ratio (A/C) in 3,636 adult out-patients with IDDM of more than 3 years duration, serum creatinine under 133 Μmol/l and who were not undergoing antihypertensive treatment. A/C indicating microalbuminuria (≥2.38/ 2.96 mg/mmol, male/female) was found in 620 of 3,451 patients without proteinuria, and associated with hypertension (blood pressure ≥140 and/or 90 mm Hg; p=0.0016; rate: 39.6%), independent of diabetes duration (p=0.0082) and male gender (p=0.0350; relative risk=1.16; 95% confidence interval: 1.01–1.32). Hypertension was less common among those with normal A/C (27.5%, p〈0.0001) but was positively related with diabetes duration. Of the 1,015 patients with A/C〉2.0 mg/mmol 529 were reexamined. Glycated haemoglobin levels exceeded 3 SD above the mean of normal in 84.3% of the 198 microalbuminuric patients (AER=20–200 Μg/min), but were comparably poor (79.2%) in normoalbuminuria. Duration of diabetes was inversely related to glycated haemoglobin only in microalbuminuria (0.05〈p〈0.1). Intervention to lower blood pressure remains mainly restricted to those patients with long-term diabetes and slower development of kidney disease. Near-normalisation of glycaemia remains the priority for the majority of patients with microalbuminuria.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0428
    Keywords: Type 1 (insulin-dependent) diabetes mellitus ; diabetic nephropathy ; microalbuminuria ; magnetic resonance ; chronic renal failure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Reductions in the physiological cortical to medullary signal intensity ratio are found in magnetic resonance scans of the kidney in non-diabetic glomerular disease. Whether this abnormality can also characterise patients with Type 1 (insulin-dependent) diabetes mellitus and nephropathy is not known. We measured the cortical to medullary signal intensity ratio in magnetic resonance images of the kidney in 34 patients with Type 1 diabetes (ten with either clinical proteinuria or raised serum creatinine or both, nine with microalbuminuria, seven with normal urinary albumin excretion and long duration of diabetes and eight with Type 1 diabetes of short duration). The cortical to medullary signal intensity ratio showed a trend to cluster at lower values in the normoalbuminuric patients with normal serum creatinine rather than in the nine healthy individuals, independent of Type 1 diabetes duration (1.47 ± 0.06 and 1.41 ± 0.13 vs 1.63 ± 0.16; five groups-Scheffé F-test p = 0.05–0.1). Among the Type 1 diabetic patients, significant reductions in the cortical to medullary signal intensity ratio characterised overt nephropathy (1.19 ± 0.15, p 〈0.05 vs all groups), but not microalbuminuria (1.47 ± 0.13, p = NS), concomitantly with low glomerular filtration rate and elevated fractional excretion of uric acid, but independent of glycaemic control. The determinants of the renal cortical to medullary signal intensity ratio in Type 1 diabetes are uncertain. Reductions in the cortical to medullary signal intensity ratio may be a late finding in diabetic nephropathy, and parallel the accompanying impairment in kidney haemodynamics. Magnetic resonance imaging of the kidney may not offer clues in the early diagnosis of diabetic nephropathy.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-5233
    Keywords: Diabetic nephropathy ; Microalbuminuria ; Type 1 (insulin0dependent) diabetes mellitus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The prevalence of microalbuminuria and arterial hypertension among type 1 (insulin-dependent) diabetic patients is poorly known in Italy. In the preliminary phase of a large outpatient screening programme, we addressed the possibility of using non-time urine samples to predit the chance of detecting albumin excretion rate (AER) in the range of microalbuminuria. We therefore measured urinary albumin and creatinine concentration in timed overnight collections from 641 type 1 diabetic patients with serum creatinine levels lower than 133 μmol/l. AER was strongly and comparably predicted both by urinary albumin concentration (UAlb;r 2=0.754) and by the urinary albumin to creatinine concentration ratio (A/C;r 2=0.773). After exploring several independent cut-off levels for UAlb and A/C, AER in the range 20–200 μg/min (n=91) was found to be predicted with 90% sensitivity and specificity either by UAlb≧20 mg/l or by A/C≧2.0 mg/mmol. UAlb was negatively associated with diuresis, and false negative outcomes were explained by polyuria when screening by this variable. A/C was positively associated with female gender among normoalbuminuric patients, in line with the lower urinary excretion of creatinine in women (7.2±0.25 vs 10.2±0.35 μmol/min,P〈0.00001). A significant excess of false positive outcomes in women compared with men was found when screening by any A/C cut-off level equal to or less than 2.5 mg/mmol. Simplified screening techniques seem to remain, however, a practicable option for the detection of microalbuminuria both in epidemiology and in clinical practice.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-5233
    Keywords: Diabetic nephropathy ; Hypertension ; Microalbuminuria ; Na+/Li+ countertransport ; Type 1 diabetes mellitus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Elevated erythrocyte sodium-lithium countertransport activity is an intermediate phenotype of essential hypertension among Caucasians, and may also associate with kidney disease in type 1 (insulin-dependent) diabetes mellitus. Evidence supporting the hypothesis that an inherited predisposition to essential hypertension may thus partly identify with the genetic background of susceptibility to diabetic nephropathy is, however, controversial. This review discusses the possible points of controversy, with emphasis upon the need to standardize the manifest heterogeneity in the current techniques of measurement, as well as upon the clinical concomitants and interpretation of elevated sodium-lithium countertransport activity in type 1 diabetes mellitus. Large family studies may be required in order to single out the independent contributions of genes and environment to sodium-lithium countertransport activity in type 1 diabetes mellitus. However, the original hypothesis that genes underlying elevated sodium-lithium countertransport in essential hypertension and in diabetic nephropathy may also reflect in part a predisposition to diabetic kidney disease cannot be rejected on the basis of current evidence.
    Type of Medium: Electronic Resource
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