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  • 1
    ISSN: 1432-0428
    Keywords: Hyperprolactinaemia ; insulin receptor binding ; monocytes ; erythrocytes ; insulin resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We studied insulin receptor binding and carbohydrate metabolism in 10 patients with severe hyperprolactinaemia and compared the findings with those obtained in 20 healthy control subjects. Insulin binding to monocytes and erythrocytes was significantly decreased in the patients with an excess of prolactin. Scatchard analysis of binding data indicated that a decrease in the number of receptors rather than in receptor affinity seems to be the prevailing cause of lowered binding in hyperprolactinaemic patients. Furthermore, patients with severe hyperprolactinaemia demonstrated significantly elevated blood glucose levels following oral or intravenous glucose load despite having significantly increased insulin levels after glucose administration. The infusion of insulin induced a delayed hypoglycaemic effect and a decreased inhibition of endogenous insulin secretion, as indicated by the suppression of C-peptide in the hyperprolactinaemic patients. The present data indicate that severe hyperprolactinaemia is associated with an insulin-resistant state, which seems to be caused, at least in part, by a down-regulation of insulin receptors.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0428
    Keywords: Diabetes education ; Type 1 diabetes ; severe hypoglycaemia ; diabetes care
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In two hospitals an identical diabetes teaching and treatment programme (in-patient, Monday to Friday, group teaching) was set up. Seventy-eight consecutive, conventionally treated Type 1 diabetic patients (duration of diabetes 10±6 years), referred during a certain period, were reinvestigated after 1 year, and again (for assessment of metabolic control only) 22 months after the teaching and treatment programme. Initially, mean glycosylated haemoglobin was 2.6%, after one year 1.0%, and after 22 months 1.5% above the upper limit of the normal range (p〈0.001). Hospital admissions were reduced from a mean of 10 to a median of 1 day per patient per year (p〈0.001). The long-term quality of diabetes care achieved by the diabetes teaching and treatment programme was unrelated to intelligence quotient, diabetes duration, or diabetes-related knowledge. Patients with normal levels of glycosylated haemoglobin on follow-up (33% of all patients) had particularly good compliance rates, and significantly lower initial values of glycosylated haemoglobin than patients with glycosylated haemoglobin levels ⩾10%. The data indicate that the diabetes teaching and treatment programme resulted in a substantial long-term improvement of metabolic control and a striking reduction of hospital admissions. The study substantiates the feasibility of applying this teaching and treatment programme on a large scale to other hospitals, so as to improve the quality of diabetes care and decrease health care costs.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0428
    Keywords: Humoral immunodeficiency ; agglutinins to bacterial antigens ; heteroagglutinins ; serum immunoglobulin concentration ; suspectibility to infections ; HLA gene complex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Humoral immunity to bacterial antigens was tested in 49 tissue typed patients with juvenile onset diabetes mellitus (JOD) and in 50 healthy controls. The number of patients with agglutinins to E. coli and staphyloccoci was significantly lower compared to controls (p〈0.001, p〈0.01 respectively). Missing antibody formation to pertussis and diphtheria toxoid could also be detected in a higher percentage of JOD patients than of controls (p 〈 0.05; p ≃ 0.05, respectively). By contrast heteroagglutinins to sheep and rabbit erythrocytes were found in similiar proportion in both groups and the values of immunoglobulin serum concentrations showed no difference between patients and controls. In addition no correlation between antibody formation and genes of the HLA complex was found. It is suggested that the severely reduced agglutinin formation to bacterial antigens might be partly responsible for susceptibility to bacterial infections in juvenile diabetics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Diabetologia 19 (1980), S. 555-556 
    ISSN: 1432-0428
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0428
    Keywords: Cyclosporin A ; Type 1 (insulin-dependent) diabetes mellitus ; immunotherapy ; C-peptide ; islet function ; remission of Type 1 diabetes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In the Canadian/European randomized controlled study on cyclosporin A (CsA) in recent onset Type 1 (insulin-dependent) diabetes, treatment with the immunosuppressive drug had increased and maintained Beta-cell function and clinical remission during the first 12 months. Following discontinuation of the study drug and double-blinding after a mean of 13.8 months former CsA patients doubled the daily insulin dose within 6 months reaching the level of former placebo patients. The difference in Beta-cell function between the two groups was also lost. Metabolic control (HbA1c) was transiently worse in the former CsA group. Adverse effects of cyclosporin A on systolic blood pressure, haemoglobin levels, serum potassium and creatinine levels also remitted during that time. We conclude that treatment with cyclosporin A for a mean of 13.8 months had no long-lasting effect on the course of Type 1 diabetes persisting beyond drug discontinuation.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0428
    Keywords: Diabetes mellitus ; Type 2 (non-insulin-dependent) diabetes ; insulin resistance ; magnesium ; electrolytes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Low levels of magnesium have frequently been reported in diabetes mellitus especially in poorly controlled Type 1 (insulin-dependent) diabetic patients. Furthermore hypomagnesaemia might contribute to insulin resistance in Type 2 (non-insulin-dependent) diabetes. As the influence of improved metabolic control on plasma magnesium levels is unknown in Type 2 diabetic patients we studied magnesium plasma levels in 50 patients 1) before, 2) one and 3) three months after the initiation of insulin therapy or intensified treatment with oral hypoglycaemic agents. Magnesium plasma levels were measured by a colorimetric method and were significantly reduced in diabetic patients compared to healthy control subjects (0.79±0.01 mmol/l vs 0.88±0.01 mmol/l; p〈0.0001). Metabolic control was significantly improved as documented by reduced HbA1C levels in both insulin-treated patients or the patients on oral hypoglycaemic agents (p〈0.003). However, plasma magnesium levels remained unchanged during the follow-up in the insulin-treated group (1∶0.79±0.02 mmol/l; 2∶0.81±0.02 mmol/l; 3∶0.79±0.01 mmol/l) as well as in the patients on oral hypoglycaemic agents (1∶0.79±0.03 mmol/l; 2∶0.78±0.02 mmol/ l; 3∶0.84±0.04 mmol/l). This study shows that even marked improvement of glycaemic control does not correct hypomagnesaemia in Type 2 diabetes. We conclude that hypomagnesaemia might be related to the insulin-resistant state and that possible beneficial effect of chronic magnesium administration should be evaluated in these patients.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0428
    Keywords: Diabetes mellitus ; coagulation factors ; lipid peroxides ; endothelial cell ; cardiovascular risk ; diabetic nephropathy ; urinary albumin excretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Parameters of haemostasis, endothelial cell markers and lipid peroxide levels were studied in 64 Type 1 (insulin-dependent) and 94 Type 2 (non-insulin-dependent) diabetic patients according to their urinary albumin excretion rate in comparison with age-matched control subjects. We determined plasma levels of fibrinogen (Clauss' method), coagulation factor VII:activity (clotting assay), factor VII antigen, protein C and S antigen, von Willebrand factor antigen,d-dimer concentration (ELISA), and lipid peroxide levels (thiobarbituric acid) in relation to urinary albumin excretion rate (RIA). Significant positive correlations were found between urinary albumin excretion rate and plasma fibrinogen (p〈0.005,p〈0.02), factor VII activity (p〈0.0002,p〈0.002), factor VII antigen (p〈0.0001,p〈0.001), protein C (p〈0.003,p〈0.05), and lipid peroxides (p〈0.02,p〈0.004) in Type 1 as well as in Type 2 diabetes. Von Willebrand factor (p〈0.001) and protein S (p〈0.0005) correlated with albuminuria only in patients with Type 1 diabetes. Although most of the haemostatic abnormalities are already found in normoalbuminuric patients, the significant positive correlations to urinary albumin excretion indicate that endothelial cell damage and coagulation disorders deteriorate with the progression of diabetic nephropathy.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-0428
    Keywords: Keywords Non-insulin-dependent diabetes mellitus, gastric emptying, blood glucose concentration, hyperglycaemia, hypoglycaemic therapy.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Aims/hypothesis. Hyperglycaemia that is induced short-term slows gastric emptying in healthy subjects and patients with diabetes mellitus. Little information is available on the impact of longer-lasting, naturally occurring blood glucose increases and their reduction to euglycaemic values. We studied the relation between gastric emptying and pre-prandial and postprandial blood glucose concentrations in patients with Type II (non-insulin-dependent) diabetes mellitus and secondary failure to respond to oral hypoglycaemic treatment (a) before readjusting hypoglycaemic therapy and (b) 1 week thereafter.¶Methods. We studied 9 female and 1 male patient (age 60–78 years, BMI 21.9–32.5 kg/m2, diabetes duration 3–33 years, HbA1 c 8.8–13.2 %). Gastric emptying of a radiolabelled semisolid 1168 kJ meal was recorded scintigraphically.¶Results. Blood glucose concentration pre-prandial and postprandial was considerably lower subsequent to than before therapy readjustment in all patients (fasting, 7.9 mmol/l ± 1.5 SD vs 11.7 ± 1.7 mmol/l; 60 min postprandial, 11.7 ± 2.0 vs 15.4 ± 2.2 mmol/l). By contrast, gastric emptying was unchanged (residual radioactivity in stomach 50 min postprandial 65.7 ± 14.1 % vs 66.5 ± 12.9 %). There was no relation between emptying and either fasting blood glucose concentration or its postprandial increase.¶Conclusion/interpretation. The data do not support a major impact of actual, longer-lasting, naturally occurring blood glucose concentrations upon the rate of gastric emptying in patients with Type II diabetes. [Diabetologia (1999) 42: 1410–1412]
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-0428
    Keywords: Keywords Insulin-dependent diabetes mellitus ; non-enzymatic glycation ; monocyte/macrophage ; receptor for AGEs ; circulating AGEs ; cytokines.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Accelerated modification of proteins by glucose terminating in the formation of advanced glycation endproducts (AGEs) is one of the main pathogenetic mechanisms of diabetes-associated complications. One pathway by which AGEs may exert their effects is by interaction with specific receptors initially identified on macrophages, monocytes and endothelial cells. As AGE-induced autocrine upregulation of AGE receptors has been observed in vitro, we hypothesized that AGE-binding might be enhanced in diabetic patients to compensate for the elevated levels of circulating AGEs. We therefore examined the expression of AGE-binding sites on peripheral monocytes, serum levels of AGEs and AGE-induced cytokine production in patients with insulin-dependent diabetes mellitus (IDDM) compared to age-matched, healthy control subjects. In patients, AGE-binding capacity was significantly increased and there was only one class of binding sites, as revealed by Scatchard analysis (1.8 × 105 vs 1.4 × 105 binding sites per cell). Affinity of binding was, however, similar (Ka 1.5 × 106 vs 1.4 × 106 mol− 1). Saturation of binding was reached at 2.0–3.0 μmol/l with AGE-bovine serum albumin (BSA) as ligand. In contrast, cytometry using fluorescein isothiocyanate-labelled AGE-proteins showed no saturability and reversibility of AGE-binding up to 80 μmol/l, indicating non-specific binding in this concentration range. Again, this non-specific binding was significantly higher in IDDM patients. In addition, we found much higher levels of circulating AGEs in patients as compared to controls and studied possible functional consequences of increased AGE binding in vitro, monocyte stimulation by AGEs triggering cytokine release to a similar extent in patients and controls, i. e. independently of the AGE-binding capacity. Our finding of an enhanced overall AGE-binding capacity of peripheral monocytes in IDDM could be instrumental in limiting the plasma concentration of AGEs, the non-specific binding coming into play after saturation of specific binding sites by higher plasma AGE-levels. Both binding strategies may act in concert as “damage limitation mechanisms” in the development of AGE-dependent diabetic complications. [Diabetologia (1998) 41: 674–680]
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-0428
    Keywords: Keywords Autoantibodies ; oxidised LDL ; diabetic late complications ; atherosclerosis ; immune complex ; insulin-dependent diabetes mellitus.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Diabetes mellitus is associated with an increased risk of atherosclerosis. The oxidation of low-density lipoproteins (LDL) is considered a key event in the initiation of atherosclerosis. To investigate LDL oxidation in vivo we measured autoantibodies to oxidised LDL (oxLDL) in 94 patients with insulin-dependent diabetes mellitus (IDDM), compared to 27 age-matched, healthy control subjects. Patients and control subjects were screened for autoantibodies using a solid phase ELISA, comparing the binding to oxLDL with that to native LDL (nLDL). In patients with IDDM the oxLDL/nLDL antibody ratio was significantly higher than in control subjects (means ± SEM: 2.24 ± 0.26 vs 1.17 ± 0.17, p 〈 0.03). Antibody-negative patients had a longer diabetes duration (13.5 ± 1.3 vs 9.1 ± 1.1 years, p 〈 0.01) and higher actual and mean HbA1 c levels compared to antibody-positive patients (8.8 ± 0.2 vs 7.9 ± 0.2 %, p 〈 0.005 and 8.3 ± 0.2 vs 7.7 ± 0.2 %, p 〈 0.03; respectively). In patients with a high microangiopathy score, the antibody ratio was lower than in patients without complications (1.04 ± 0.10 vs 2.40 ± 0.29, p 〈 0.01). OxLDL specific immune complexes were found exclusively in antibody-negative as compared to antibody-positive patients (18.3 vs 0 %; p 〈 0.01). Our data demonstrate an inverse relationship between free oxLDL antibodies and the severity of the disease. This apparent paradox can be explained in part by our demonstration of oxLDL immune complexes, masking free antibodies. [Diabetologia (1998) 41: 350–356]
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