Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0042373 (vascular disease)
 17,070 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

When guinea pig antibodies (ab) bind insulin (ag), they can make complexes of different sizes. We propose the following model: In ab excess: (see article) Intermediate: (see article) In ag excess: (see article). An insulin molecule acts as a bivalent antigen, although more than two different antigenic determinants may be present. In vivo the large C II type disappears more rapidly from the blood than does the C I. The C II binds to complement factor C1q, whilst C I and C III do not. In sera from insulin treated patients we found C I and C III. The lack of lattice formation, due to the bivalency, may explain the difficulty in obtaining precipitation. The different complexes may influence calculations of antibody concentrations and affinity constants of the binding sites. The in vivo effects and possible clinical effects of antibodies to insulin may depend on the type of complex formed. Possibly, prevailing C II formation tends to cause large insulin requirements, although C II may seldomly be detected in the blood, because of rappid trapping. The immune complexes could affect the progression of angiopathy a) by interfering with insulin metabolism and control of diabetes, and b) by complement activation (mainly C II) and trapping in the vascular bed.
 ...
PMID:Insulin--anti-insulin complexes. 6 11

53 patients coming to amputation of one or more toes for the late results of degenerative vascular disease were studied prospectively. By a median time of thirteen months, 26 of the 53 had undergone a major amputation of the affected side. Diabetes was associated with the same prognosis as atherosclerosis obliterans uncomplicated by diabetes. A palpable pedal pulse or a functioning arterial reconstruction carried a virtual guarantee of success for the toe amputation. The presence of a popliteal pulse, however, was not associated with any better prognosis than the presence of a femoral pulse alone. Smoking seemed to exert little influence. With the passage of time, the major-amputation rate rose steadily, and by 3 1/2 years almost three-quarters of the patients had come to major amputation.
 ...
PMID:Amputation of the toes for vascular disease: fate of the affected leg. 6

Neuropathological evidence of demyelination was found in the brain and sciatic nerve of diabetic patients at autopsy. The activity of acid proteinase was somewhat increased in the white matter but decreased in the gray matter of diabetic patients. No increase was observed in the activity of neutral proteinase in diabetic white and gray matter. The activities of beta-glucuronidase and 2',3'-cyclic nucleotide-3'-phosphohydrolase (CNP) were of the same level as those of the controls. The activities of all 4 enzymes appeared to be increased in the diabetic nerve, with the possible exception of CNP which was measured from only 1 nerve. Furthermore, the amount of total protein was markedly decreased in diabetic peripheral myelin. The encephalitogenic basic protein of diabetic brain myelin was normal in the disc gel electrophoretic patterns of brain myelin proteins. However, the basic proteins of peripheral myelin were reduced in a number of diabetic patients. The present biochemical findings for diabetic white and gray matter were largely normal. Instead, the increased activities of at least the proteinases and beta-glucuronidase in diabetic peripheral nerve, together with the loss of basic proteins, indicate extensive biochemical damage of the peripheral nervous system in diabetes. They suggest that demyelination and other phenomena observed in diabetic peripheral nerve are not caused only by angiopathy and impaired circulation.
 ...
PMID:Enzyme and protein studies of demyelination in diabetes. 7 40

Microvascular disease is the predominant manifestation of the juvenile-onset diabetic after the third decade of survival, while large vessel atheroma is the major problem in the long-term survival of the maturity-onset diabetic. From the experience of a diabetic-eye clinic, we would estimate that only about 3% of patients attending a hospital diabetic clinic would have a severe form of diabetic retinopathy which might need specialized ophthalmic photocoagulation treatment. The long-term visual prognosis for patients treated in this way remains under review. Among metabolic factors associated with vascular disease, a deficiency of HDL cholesterol may be important in the future prognosis of maturity-onset diabetes.
 ...
PMID:The prognosis for diabetes. 11 81

Platelet aggregation and adhesion are commonly increased in diabetes mellitus. These abnormalities may in part be responsible for the increased incidence of vascular disease in diabetics. We have investigated the effects of diet, diet plus glibenclamide, and diet plus gliclazide on plasma glucose control and platelet function in 10 newly diagnosed maturity-onset diabetics who had not previously been treated. Before treatment, the mean postprandial plasma glucose value was 13,4 +/- 0,8 mmol/l, which fell insignificantly on dietary treatment, to 12,2 +/- 1,0 mmol/l (P greater than 0,05). Both glibenclamide and gliclazide, when added to the diet, significantly lowered mean plasma glucose values to 9,3 +/- 0,8 mmol/l and 7,8 +/- 0,8 mmol/l respectively (P less than 0,05). Platelet aggregation in response to 1 mumol adenosine diphosphate (ADP) was increased in the diet period, whereas aggregation in response to 10 mumol and 100 mumol was normal. This suggests an increased sensitivity of the platelets to ADP in diabetic patients. The addition of both glibenclamide and gliclazide reduced the magnitude of the response to within the normal range. Platelet aggregation in response to 10 mumol adrenaline and 750 micrograms/ml collagen was significantly reduced by glibenclamide (P less than 0,05). We conclude that sulphonylurea therapy appears to reduce the increased platelet aggregation which occurs in diabetics. This may play a role in the prevention of vascular disease.
 ...
PMID:Effects of the sulphonylurea drugs gliclazide and glibenclamide on blood glucose control and platelet function. 12 45

Platelets from diabetic patients show both increased platelet adhesiveness and sensitivity to aggregating agents. Plasma levels of the platelet-active von Willebrand Factor and the closely related factor-VIII antigen are significantly elevated, while factor VIII procoagulant activity is not. This may reflect either intravascular coagulation or disproportionate production or degradation. Plasma factors that enhance ADP-induced platelet aggregation are found in 50% of unselected male diabetics. Activity is clearly demonstrated only when plasma is added immediately prior to adding subthreshold doses of ADP to platelet-rich plasma obtained from control subjects. Systematic investigations of the molecular nature of such factors and their interactions with platelets are in progress. In platelets obtained from diabetic subjects, we have previously found increased sensitivity to the aggregating effects of arachidonic acid, and increased synthesis of immunoreactive prostaglandin E-like material. More recent studies have shown that platelets obtained from diabetic subjects are less sensitive to the antiaggregatory effects of imidazole, a thromboxane synthetase inhibitor. These observations suggest that increased synthesis of the labile aggregating substance thromboxane A2 also occurs in platelets obtained from diabetics. Collectively, these platelet and plasma abnormalities may contribute to accelerated vascular disease of diabetes. Prospective studies using antiplatelet agents are presently underway or in the planning stages in diabetics to explore their potential beneficial effects.
 ...
PMID:Platelet adhesion and aggregation in diabetes mellitus. 12 93

Vascular disease in diabetics could arise in part from altered vessel wall catebolism. Specific activities of hydrolases in aortic smooth muscle cells from rats with streptozotocin-induced diabetes were measured. Enyzmes included: neutral alpha-glucosidase, alpha-mannosidase, and lysosomal N-acetyl beta-glucosaminidase, beta-galactosidase, cathepsin C, acid alpha-glucosidase, and acid cholesteryl esterase. After 4,8, and 11 weeks of diabetes, activities of all enzymes studied were decreased significantly in diabetic vessels, decreases ranging from 15% for cathepsin C to 62% for alpha-mannosidase. After 3 weeks of diabetes, insulin treatment for 1 week restored enzyme levels to normal. After 7 weeks of diabetes, 1 week of insulin treatment did not restore enzyme levels fully to normal (acid cholesteryl esterase was unchanged); 4 weeks of insulin did. Acid phosphatase and N-acetyl beta-glucosaminidase activities were reduced markedly in histochemical studies of diabetic aortas at all time periods and were restored by insulin treatment. Alloxan-induced diabetes gave results similar to those with streptozotocin. Significant decreases of aortic hydrolase activities, including those of lysosomes, occur in experimental diabetes mellitus and could contribute to accumulation of substrates in vascular smooth muscle cells.
 ...
PMID:Hydrolase activities in the rat aorta. I. Effects of diabetes mellitus and insulin treatment. 14 80

The clinical and biochemical features of eleven patients with Type V hyperlipoproteinaemia have been reviewed. All patients were male, and there was a high incidence in the group of obesity, vascular disease, acute abdominal pain, gout, diabetes mellitus and alcoholism. Plasma cholesterol concentrations ranged from 212 to 1512 mg/100ml and triglycerides from 708 to 7670 mg/100 ml. Lipaemia was associated with significant hyponatraemia, and also interfered with the determination of plasma glucose and serum amylase. Chylomicronaemia and hyperprebetalipoproteinaemia were accompanied by reduction in the pools of beta and alpha lipoproteins. All lipoprotein classes were relatively depleted of cholesterol compared to triglyceride. There was a variable pattern of treatment response. In some patients alcohol withdrawal produced a rapid improvement in plasma lipids. In diabetes mellitus there were two types of response: a rapid one in chronic insulin deficiency, and secondly, a more gradual one in mild diabetes associated with hyperinsulinaemia. In other patients there was a rapid response to carbohydrate-calorie restriction but the respective contributions of each of the steps remained unclear.
 ...
PMID:Type V hyperlipoproteinaemia re-visted: findings in a sydney population. 16 79

We have presented and reviewed evidence for the heterogeneous nature of diabetes mellitus in terms of genetics, environmental factors, insulin responses to glucose and vascular disease. We have reviewed evidence for heterogeneity between juvenile-onset diabetes (JOD) and maturity-onset diabetes (MOD) and maturity-onset diabetes of young (MODY) and for heterogeneity within groups of JOD and MOD and MODY patients. Although much remains to be learned, a beginning has been made and suggests that primary diabetes mellitus is not a single specific disease but a syndrome comprised of a variety of diseases all characterized by hyperglycemia and tissue changes that result from heterogeneous etiologic and pathogenetic factors. Future classifications of primary diabetes mellitus will undoubtedly be lengthy, as are for other diseases and syndromes also caused by a variety of etiologic and pathogenetic mechanisms.
 ...
PMID:Clinical and etiological heterogeneity of idiopathic diabetes mellitus. The banting memorial lecture. 22 48

Sensory conduction velocity of the median nerve, motor conduction velocity of both median and tibial nerves, and corresponding distal laterncies are sufficient parameters to establish the diagnosis of polyneuropathy almost with certainty. Considering these six parameters yielded in detection of peripheral nerve dysfunction in 22% of diabetic patients who were free from clinical signs of polyneuropathy. Electroneurographical findings in 340 out of 677 patients with diabetes mellitus were interpreted as evidence of segmental demyelination. Within this group there was the majority of patients with clinical signs of polyneuropathy and with subclinical signs of peripheral nerve dysfunction. There existed a positive correlation between signs of nerve dysfunction with angiopathy, age and duration of the disease. A second group consisting of 243 diabetics with signs of incipient segmental demyelination with or without signs of axonaal degeneration mainly included juvenile patients with a short duration of the disease and with a low frequency of angiopathy.
 ...
PMID:[Diabetic polyneuropathy. 4. Synopsis of electroneurographic findings in diabetics]. 23 78


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