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)

Diabetes mellitus was induced in Lewis rats by streptozotocin, and these animals and control rats fed ad lib were studied after 7 weeks. At the time of sacrifice, nondecalcified histological sections of bone were prepared and subsequently quantitated by micromorphometric techniques. In addition, tibial alkaline phosphatase and mineral ash content were determined. The bones obtained from the diabetic animals are characterized by significant decrements in the quantities of osteoid and osteoclasts and by failure to acquire a tetracycline label. These histological features are attended by reduced quantities of urinary hydroxyproline and tibial alkaline phosphatase. As compared with control animals fed ad lib, diabetic rats are hyperphosphatemic and markedly hypercalciuric. Circulating alkaline phosphatase is also elevated and associated with a parallel increase in intestinal content of this enzyme. Although serum corticosterone levels are increased, diabetes is associated with decrements in both circulating immunoreactive parathyroid hormone and 1,25(OH)2D. We conclude that prolonged streptozotocin-induced diabetes mellitus in the rat results in reduced bone turnover. The relative roles that functional caloric deprivation, low circulating levels of 1,25(OH)2D, hypercalciuria, hypercortisolemia, and decreased blood parathyroid hormone levels play in the genesis of these skeletal abnormalities remain to be determined.
 ...
PMID:The effect of streptozotocin-induced chronic diabetes mellitus on bone and mineral homeostasis in the rat. 645 Feb 54

The clinical characteristics of 107 patients younger than 60 years with mitral anular calcium (MAC) were compared with those of 107 age- and sex-matched control subjects. The patients with MAC included 55 men and 52 women, mean age 51 years. The control group included 55 men and 52 women, mean age 51 years. Patients with MAC had a higher prevalence of cardiomegaly on chest x-ray (p less than 0.0001), left atrial and left ventricular enlargement by echocardiography (p less than 0.0001), precordial murmurs (p less than 0.0001), diabetes mellitus (p less than 0.0001), systemic hypertension (p less than 0.025) and total conduction defects on surface electrocardiograms (p less than 0.0001) compared with the age- and sex-matched control subjects. The mean serum phosphorus and product of serum calcium and phosphorus were higher in patients with MAC (p less than 0.0025) than in the control subjects. The prevalence of coronary heart disease, aortic stenosis and hypertrophic cardiomyopathy and the mean serum cholesterol, triglyceride, total protein, albumin, creatinine, alkaline phosphatase and calcium levels were not significantly different between patients with MAC and the control subjects.
 ...
PMID:Clinical characteristics of patients younger than 60 years with mitral anular calcium: comparison with age- and sex-matched control subjects. 650 99

The influence of diabetes on mortality and morbidity following operations for obstructive jaundice has been assessed in 118 consecutive patients, all of whom received antibiotic cover, subcutaneous heparin and intravenous mannitol. 44 patients had diabetes mellitus (37%). There were 12 post operative deaths (10%). Factors which significantly contributed to mortality included; admission values for alkaline phosphatase, creatinine, haematocrit, bilirubin and age of patient over 70 years. Although mortality was not increased in diabetics, wound sepsis was significantly more common (20% and 4% respectively; p less than 0.02). The majority of infections were due to antibiotic sensitive Staphylococcus aureus. Diabetes did not influence survival after operation for malignant disease.
 ...
PMID:Influence of diabetes on mortality and morbidity following operations for obstructive jaundice. 669 98

The isoenzymes of canine alkaline phosphatase have been separated by isoelectric focusing on agarose gels. Alkaline phosphatase from normal tissue extracts gave heterogeneous focusing patterns with the following isoelectric points: liver pH 4.3, bone pH 4.0 to 4.9, kidney pH 4.4 to 4.7 and intestine pH 3.6 to 4.6. Plasma alkaline phosphatase isoenzymes were examined in 123 dogs with activities at least twice the normal maximum. The isoenzymes from these plasma samples had multiple bands at pH 4.3 to 4.6 but in 67 per cent of all cases, the predominant isoenzyme, named isoenzyme A, was a single band of isoelectric point pH 3.5. Isoenzyme A occurred in all dogs with diabetes mellitus or Cushing's syndrome and in 93 per cent of animals receiving steroid therapy. Increased activities of the pH 4.3 to 4.6 isoenzymes were more likely to occur in cases of hepatic degeneration.
 ...
PMID:Isoenzymes of canine plasma alkaline phosphatase: an investigation using isoelectric focusing and related to diagnosis. 687 82

The influence of streptozotocin-induced diabetes on discrete stages of matrix-induced endochondral bone formation has been investigated. Mesenchymal cell proliferation was inhibited in diabetic rats as evidenced by a 65% reduction of ornithine decarboxylase (ODC) activity and a 56% reduction of [3H]thymidine incorporation per microgram DNA compared to nondiabetic controls; the inhibition was prevented by insulin treatment. In diabetic animals, chondrogenesis on day 7 was reduced by 49% compared to control animals as assessed by 35SO4 incorporation. Exogenous insulin was stimulatory to cartilage development when present during days 0 through 4 (mesenchymal cell proliferation). Calcification of cartilage and osteogenesis were reduced by more than 50% in diabetic rats and corrected by insulin as measured by alkaline phosphatase activity and 45Ca incorporation. Decreased in vivo endochondral bone growth and development during diabetes is the result of 1) inhibition of insulin-dependent mesenchymal cell proliferation, 2) decreased and delayed cartilage formation due to impaired mesenchymal cell proliferation, 3) decreased and delayed vascular invasion prior to chondrolysis and osteogenesis, and 4) reduced insulin-dependent calcification and ossification.
 ...
PMID:Influence of experimental diabetes and insulin on matrix-induced cartilage and bone differentiation. 698 62

Biochemical and bone scintigraphic studies were performed in nondiabetic and diabetic patients receiving hemodialysis at the time of kidney transplantation to assess the degree of secondary hyperparathyroidism. Despite lower serum calcium concentrations, diabetic patients had significantly lower parathyroid hormone (PTH) levels than nondiabetic patients. In addition, diabetic patients had lower graded total-skeletal scintigraphic scores than nondiabetic patients. The PTH levels showed positive correlations with bone scan scores and with alkaline phosphatase in nondiabetic patients but not in diabetic patients. Avascular necrosis occurred in 17% of nondiabetic patients and in only 2% of diabetic patients. Patients with avascular necrosis had significantly higher PTH levels than patients without avascular necrosis. Diabetes mellitus seems to confer a protective effect from the skeletal manifestations of secondary hyperparathyroidism, including avascular necrosis.
 ...
PMID:Decreased secondary hyperparathyroidism in diabetic patients receiving hemodialysis. 700 80

To assess the relationship between the decreased bone mass observed in young insulin-requiring diabetic patients and vitamin D metabolism, we measured serum 25-hydroxyvitamin D, 24,25-dihydroxyvitamin D, and 1,25-dihydroxyvitamin D concentration in 45 white, insulin-dependent diabetic subjects, 7-18 yr of age. Metacarpal cortical thickness in 87% of these diabetics was below the mean for their respective ages, while 16% had a cortical thickness value greater than 2 sDs below the mean. Serum calcium and phosphate concentrations were normal, immunoreactive parathyroid hormone was in the low normal range, and total serum alkaline phosphatase was elevated compared to age- and sex-matched controls. Circulating 24,25-dihydroxyvitamin D concentrations were significantly elevated, and 1,25-dihydroxyvitamin D was significantly decreased. The increase in 24,25-dihydroxyvitamin D was greater in the diabetics with the most severe bone loss and was maximally increased during the first 5 yr of clinical diabetes. No apparent correlation was seen between metabolic control, as measured by hemoglobin A1C and urine and plasma glucose, and the circulating levels of the vitamin D metabolites. Despite appropriate insulin replacement, alterations in vitamin D metabolism occur in the young insulin-dependent diabetic and could relate to the decrease in cortical bone mass observed in these patients.
 ...
PMID:Alterations in circulating vitamin D metabolites in the young insulin-dependent diabetic. 702 72

Alterations in circulating alkaline phosphatase have been described in both man and the experimental animal with chronic insulin deficiency. We evaluated plasma and tissue alkaline phosphatase levels in freely-fed control, streptozotocin-induced diabetic and insulin-treated diabetic rats, seven weeks after the induction of diabetes. Circulating alkaline phosphatase activity was markedly elevated in the insulin deficient animal (p less than 0.001) and completely normalized following insulin administration. The elevated plasma alkaline phosphatase activity observed in the insulin deficient animals was heat-resistant and phenylalanine-sensitive, a pattern typical of the intestinal isoenzyme. Small intestinal alkaline phosphatase activity was significantly higher (p less than 0.01) in the diabetic animals, but comparable in the insulin-replaced and control rats. The intestinal isoenzyme activity was found to be strikingly insulin-sensitive; withholding insulin therapy for 36 hr prior to sacrifice resulted in an abrupt rise in both plasma and intestinal alkaline phosphatase values comparable to those observed in the insulin-deficient state. In contrast to these observations, skeletal alkaline phosphatase activity was decreased in the insulin deficient animal (p less than 0.01) and this abnormality was corrected by insulin replacement. Neither insulin deficiency nor insulin replacement resulted in any significant changes in the hepatic alkaline phosphatase isoenzyme.
 ...
PMID:Alkaline phosphatase activity in chronic streptozotocin-induced insulin deficiency in the rat: effect of insulin replacement. 703 17

In oral sulfonylurea treated diabetics, decreased plasma 25-hydroxycholecalciferol and increased activity of bone isoenzyme of serum alkaline phosphatase and urinary hydroxyproline excretion was found when compared with control subjects. In stepwise regression analysis significant relationships were found between bone isoenzyme, urinary hydroxyproline excretion, serum calcium levels and blood glucose levels. The partial correlation and multivariate regression analysis showed that in oral sulfonylurea treated patients, but not in insulin treated patients, the activity of bone isoenzyme of serum alkaline phosphatase was significantly inverse dependent on the 25-hydroxycholecalciferol levels in plasma. Oral sulfonylurea agents which are known to induce the hepatic microsomal system seem to be an additional factor to poor control of diabetes, leading to osteopathy.
 ...
PMID:Plasma 25-hydroxycholecalciferol in oral sulfonylurea treated diabetes mellitus. 704 Jan 94

Experimentally induced diabetes enhances the specific activity of several microvillus membrane proteins in the rat small intestine. The increase in the specific activity of sucrase-isomaltase has been shown by others to be due to an increase in enzyme protein, raising the possibility that diabetes induces a generalized increase in microvillus membrane proteins. Since intramembrane particles (IMPs) seen on freeze-fracture replicas of microvillus membranes are thought to represent integral membrane proteins, we compared microvillus IMP densities in diabetic rats with those in control rats. In addition, mucosal sucrase, maltase, and alkaline phosphatase specific activities were measured in all animals. Diabetic rats had significantly increased sucrase and maltase but not alkaline phosphatase specific activities compared with control rats. The density of microvillus IMPs on both the protoplasmic and extracellular fracture faces of undifferentiated crypt cells and villus absorptive cells was not increased in experimental diabetes. These data indicate that diabetes does not result in a generalized increase in microvillus membrane proteins. Thus the enhanced activity of microvillus membrane proteins in diabetes appears to be highly selective.
 ...
PMID:Structural features of the rat small intestinal microvillus membrane in acute experimental diabetes. 704 26


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