Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0011849 (diabetes)
 277,896 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The extent of nonenzymatic glucosylation of serum protein in control and diabetic subjects was measured by a chemical procedure using thiobarbituric acid. A mean value of 0.81 (+/- 0.21 SD) nmol glucose per milligram serum protein was observed in the control group. Diabetics displayed elevated levels of glucosylated serum proteins, up to 4 nmol glucose per milligram protein. Glucosylation of serum protein correlated strongly with fasting blood sugar (r = 0.71), percent hemoglobin A1 (r = 0.79), and percent glucosylated albumin (r = 0.99). There was no overlap between control and diabetic groups, i.e., within 3 SD of the mean of controls. These studies indicate that the assay for glucosylated serum protein appears to be an especially sensitive indicator of the degree of hyperglycemia in diabetes.
Diabetes 1979 Nov
PMID:Nonenzymatic glucosylation of serum proteins in diabetes mellitus. 48 39

The plasma proteins are constantly shuttling between intravascular and extravascular mass of a specific plasma protein is determined by its individual rate of synthesis and the mean total time it spends in plasma. The ratio of intravascular to total mass (distribution ratio) is determined by the relative rate, at which it passes from plasma to interstitial spaces (transcapillary escape rate: TER) and the relative return rate via lymph. TER in a specific organ depends on the local leakiness of the microvasculature. The overall value in normal man varies with the molecular weight of the protein being about 5%/h of the intravascular albumin mass, 3%/h for IgG and less than 1%/h for IgM. The higher the TER, the lower is the intravascular fraction. Hypertension, diabetes mellitus, burns, myxedema and certain types of liver cirrhosis will increase TER. In hypertension and diabetes this may be compensated for by an increased lymphatic return rate. Hypoproteinemia due to malnutrition or urinary or gastrointestinal loss is accompanied by a shift from the extravascular to the intravascular space.
 ...
PMID:Intra- and extravascular distribution of albumin and immunoglobulin in man. 73 85

This study documents the presence of marked immunofluorescence for IgG and albumin in renal extracellular membranes, especially tubular basement membranes (TBM), of patients with severe diabetic nephropathy. A comprehensive immunofluorescent analysis was carried out on kidney tissue from 83 patients--Group I: 24 living normal renal allograft donors and two infants less than one week of age. Group II: 24 patients with severe nephropathy who had juvenile onset of diabetes 16 to 30 years previously and who ranged in age from 20 to 47 years. Group III: 33 patients with severe kidney disease of varied etiologies with an age range of five to 63 years. The sections were assayed for a variety of proteins (immunoglobulins, complement components, and tissue antigens). Kidney sections of all patients with severe diabetic nephropathy were readily distinguished from kidneys of other patients and normals by the intense linear staining of the extracellular membranes, especially the tubular basement membrane for IgG and and albumin. Dual-labeled studies using FITC anti-basement membrane (BM) and tetramethyl rhodamine (TMR) antialbumin demonstrated localization of the albumin predominantly to the outer but also the inner TBM while the BM antisera reacted more intensely with the inner membrane. There is no evidence that an immunologic process is responsible for these findings. These immunofluorescent findings are specific for severe diabetic nephropathy and may reflect structural changes in the renal extracellular membranes that permit entrapment of serum proteins, possibly due to changes in permeability.
Diabetes 1976 Aug
PMID:Immunopathology of renal extracellular membranes in diabetes mellitus. Specificity of tubular basement-membrane immunofluorescence. 78 82

Kidneys of patients with severe diabetic nephropathy demonstrate marked linear immunofluorescent staining of extracellular membranes, including the tubular and glomerular basement membranes (TBM and GBM) and Bowman's capsule. Immunofluorescent studies were carried out on kidney tissue obtained from 12 diabetic and 17 nondiabetic patients from two to 12 years following renal transplantation. The frequency and intensity of SgG and albumin staining of these membranes were significantly greater in the diabetic than in the nondiabetic patients (P less than 0.0005). TBM, GBM, and Bowman's capsule staining did not occur in any of the seven kidneys studies at the time of their transplantation into diabetic recipients. Thus, the abnormalities leading to the deposition or trapping of proteins in renal extracellular membranes occur early after the placement of normal kidneys into the abnormal metabolic environment of the diabetic transplant recipient. The present study supports the concept that basement membrane alterations in diabetes are a consequence of the biochemical perturbations of diabetes rather than a separately inherited genetically linked disorder.
Diabetes 1976 Aug
PMID:Immunopathology of renal extracellular membranes in kidneys transplanted into patients with diabetes mellitus. 78 83

In a prospective study of twenty-six patients with ischemic ulcerations of the lower extremity, the predictive reliability with regard to spontaneous wound healing of diabetes, pedal pulses, ankle blood pressure (ABP) as measured by doppler ultrasound, and "leg ulcer scan" as performed by the intra-arterial injection of radioactive albumin was evaluated. The results suggest that only the leg ulcer scan is significantly reliable in predicting the likelihood of spontaneous healing. The following format for the evaluation of the ischemic leg ulcer is therefore suggested: (1) If pedal pulses are present, a three week trial of conservative therapy is indicated before further evaluation. (2) If the doppler ABP is 50 mm Hg or less, the ulcer will not heal spontaneously. (3) Leg ulcer scan is indicated: (a) in the absence of pedal pulses if ABP is less than 50 mm Hg; (b) in the presence of pedal pulses if there is no evidence of spontaneous healing after three weeks of conservative therapy.
 ...
PMID:Predictability of healing of ischemic leg ulcers by radioisotopic and Doppler ultrasonic examination. 84 83

A comparison of serum protein fractions (electrophoretic separation) between control and mild alloxan-diabetic rats examined 10 days after alloxan indicates a decrease in total protein, a decrease in percentage albumin accompanied by a decrease in A/G ratio. In severe diabetic rats examined 48 hours after the administration of alloxan, there were no changes in total protein or in serum-protein fractions. The changes in the serum protein and serum albumin in mild diabetic cases are not the result of the degree of diabetes only. But they are rather explained by the longer time interval of the uncontrolled diabetic state. ATP administered to mild diabetic rats producing the following changes: two injections of 5 mg per rat exhibit a lowering effect on the blood glucose, with a decrease in liver fat. ATP resulted also in a significant increase in serum albumin and a decrease in beta-globulin with a consequent increase in the A/G ratio. Comparison of the different protein fractions of male and female control rats did not show any significant difference. ATP administered to control animals did not alter the normal electrophoretic pattern.
 ...
PMID:Effect of repeated doses of ATP on serum protein pattern and fat content of the liver in experimental diabetes. 89 65

Blood flow and capillary filtration coefficient (CFC) were measured by strain-gauge plethysmography on the upper and lower third of the forearm in 9 normal subjects and 29 well regulated patients with diabetes mellitus of varying duration (less than 10 years, 10 to 20 years, and more than 20 years). There was no difference in blood flow in the four groups, but CFC was significantly increased in long-term diabetes (duration above 20 years) when measured at the distal part of the forearm near the wrist. Calculations showed that this was probably due to the relatively high contribution of connective tissue in this part of the forearm. Increased water filtration in connective tissue in long-term diabetics is in accordance with earlier findings of a lowered subcutaneous interstitial fluid albumin concentration in long-term diabetics, this being explained by an increase in net water outflux from the microcirculation.
 ...
PMID:Water filtration of the forearm in short- and long-term diabetes mellitus. 97 33

A screening study for coronary disease, chronical bronchitis, diabetes mellitus, hypertension, peripheral circulatory disturbance and overweight is described. 2429 persons aged over 40 years and working in two factories were studied. Typical laboratory tests, a short standardised examination by a physician and a questionnaire were used. In a 10 per cent sample the questionnaire was repeated by an interview and the serum was sent to the laboratory not only by mail, but also by a special car transport in a cooled transport box. The results of the laboratory tests are presend according to age, sex and factory. The family doctor had to be informed in nearly 70 per cent of the men and about 60 per cent of the women because of at least one suspicious symptom or sign. There was a pathological value of glucose in the urine in 14.7 per cent, a rise of glucose in the blood (above 113 mg per cent) in 5.7 per cent, of triglicerides (above 181 mg per cent) in 12.6 per cent, of cholesterol (above 264 mg per cent) in 15.4 per cent, of uric acid (male above 7.7 mg per cent, female above 7.1 mg per cent) in 6.8 per cent, of creatinine (above 1.3 mg per cent) in 6.4 per cent and the presence of albumin in urine in 2.2 per cent of the cases.
 ...
PMID:[Preventive screening in two factories. I. Methods and results (author's transl)]. 100 75

The metabolic turnover rate and transcapillary escape rate of albumin were studied with 131I-labelled human albumin in nine patients with long-term diabetes mellitus. Retinopathy was present in all patients and nephropathy in four. Plasma albumin concentration and plasma volume were reduced (P smaller than 0.05). The previously reported decrease in the intravascular albumin mass in long-term diabetics was thus confirmed by an average of 59.0 g/m2 surface area, compared with a normal value of 71.7 g/m2-(minus18%) (P smaller than 0.005). The albumin metabolic rate was increased, the fractional disappearance rate being an average 13.2% of the intravascular albumin mass per 24 hr, compared with a normal value of 8.4% (+ 57%) (P smaller 0.001). The rate of synthesis was 7.7 g - 24 h-1 - m-2 in contrast to a normal rate of 6.2 g - 24 h-1 - m-2 (+24%) (P smaller 0.001). Total body albumin mass was decreased proportionally to the intravascular mass. Confirming previous observations, we found an increase in the transcapillary escape rate of albumin (fraction of intravascular albumin mass passing to the extravascular space per unit time) from a normal average of 5.6% - hr-1 to 7.4% - hr-1 (+32%) (P ssmaller than 0.001). This finding can best be explained by an increased microvascular permeability to plasma proteins. A positive correlation between the transcapillary escape rate and fractional disappearance rate of albumin was demonstrated ( r equals 0.74; P smaller than 0.01). This supports the concept that albumin is catabolized in connection with its permeation through the microvascular endothelium.
 ...
PMID:Increased metabolic turnover rate and transcapillary escape rate of albumin in long-term juvenile diabetics. 112 93

The exchange of 125I-insulin, 125I-glucagon, 125I-proinsulin, 125I-growth hormone, 131I-albumin, 14C-inulin, and 14C-dextran across isolated rat mesentery was studied in a diffusion cell. The passage of immunoprecipitable porcine 125I-insulin (0.88 ng./ml.) was not affected by porcine proinsulin (145 ng./ml.), crystalline porcine insulin (17.4 ng./ml.), human growth hormone (87 ng./ml.), bovine serum albumin (4.5 mg./ml.), or normal guinea pig serum (840 mug. protein/ml.). However, the rate of insulin exchange was reduced by guinea pig anti-insulin antiserum and partially purified human serum-bound insulin (175 mug. protein/ml.). Bound insulin at the same concentration did not affect the exchange of 125I-glucagon, 125I-growth hormone, 14C-inulin, or 14C-dextran. Further purification of bound insulin by Sephadex G-100 chromatography yielded an approximately 45,000-molecular-weight fraction that at 5 mug. protein permilliliter allowed essentially no insulin transport. This same fraction of bound insulin significantly inhibited the disappearance of immunoprecipitable porcine 125I-insulin from the incubation medium of isolated rat hemidiaphragms. Theses studies suggest that the transport of insulin across biologic membranes, mesothelium, and possible endothelium is specifically inhibited by bound insulin, a circulating macromolecule that possesses insulin-like activity.
Diabetes 1975 Nov
PMID:Transport of peptide hormones across isolated rat mesentery: effect of human serum-bound insulin. 118 35


<< Previous 1 2 3 4 5 6 7 8 9 10 Next >>