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Query: UMLS:C0004153 (atherosclerosis)
 77,401 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

A new technique is described for the measurement of the self-diffusion coefficients of protein macromolecules in solution. The method makes use of the phenomenon of Taylor dispersion of a solute introduced into a solvent flowing in the laminar regime through a tube of circular section. Results are reported for the self-diffusion coefficient of cholesterol associated with lipoprotein molecules in dogs' serum at pH 7.4 in the temperature range 18-37 degrees C. The diffusivity of bovine serum albumin in serum has also been studied as a function of temperature at pH 7.4 and 4.7. In the more basic solution, measurements of the diffusivity as a function of protein concentration substantially agree with earlier work. For all the systems studied the diffusivity varies rapidly with temperature. The pH of the solution, in the case of bovine serum albumin, also has a significant effect on the diffusivity of the macromolecule. The latter observation is related to the amount of water bound to the protein molecule in solution.
Atherosclerosis
PMID:Diffusion coefficients for protein molecules in blood serum. 1 75

Water and glycosaminoglycan contents were measured in upper and lower thoracic aortas of claves and steers. The ability of various molarities of guanidine hydrochloride to extract glycosaminoglycans from these tissues was assessed. Some glycosaminoglycans seem to be more resistant to extraction than others. A procedure is described for the isolation of a proteoglycan. The molecule appears to contain both dermatan sulfate and chondroitin sulfate. It also seems to be less dense than cartilage proteoglycans extracted by similar methods as assessed by its behavior in centrifugal fields. The properties, locus and biological activities of this molecule are currently being studied.
Atherosclerosis
PMID:The ground substance of the arterial wall. Part 1. Extractability of glycosaminoglycans and the isolation of a proteoglycan from bovine aorta. 12 95

The results of the conducted studies testify to the existence of a certain correlation between the stage of the pathological process and immunological reactions to brain antigens and vessels in patients with cerebral atherosclerosis. In the I and II stages of cerebral atherosclerosis there is a certain predominance of seropositive reactions to brain beta-lipoproteids. In transient disorders of brain circulation there were prevalent reactions to water soluble proteins of the vascular tissue. In patients with residual symptoms of ischemic strokes the most frequent findings were seropositive reactions to brain proteins and beta-lipoproteids.
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PMID:[Immunologic reactions to tissue antigens in patients with different stages of cerebral atherosclerosis]. 18 27

The nephrotic syndrome may be associated with several complications caused by severe proteinuria. The consequences of severe renal protein loss are disturbances of water and electrolyte metabolism, thromboses and thromboembolic complications, hyperlipidemia with accelerated atherosclerosis and, finally, some other complications due to the decreased oncotic pressure and the renal loss of transport globulins and immunoglobulins. Diagnosis and treatment of these complications are important in the management of patients with nephrotic syndrome. In the present study, the frequency and localization of thromboses and thromboembolic complications in 11 patients with nephrotic syndrome are described. In addition, factors which are known to be responsible for the hypercoagulable state in nephrotic syndrome were evaluated and correlated to the thromboembolic complications in these patients. An important finding was that in all patients with thromboses and thromboembolic complications, the serum albumin concentrations were below 2 g/100 ml, whereas, with one exception, serum albumin levels were above 2 g/100 ml in cases without thromboembolic complications. Our results indicate that serum albumin levels may be used as an indirect parameter to assess the risk of thromboembolic complications in patients with nephrotic syndrome.
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PMID:[Complications of nephrotic syndrome with special reference to thromboembolic accidents]. 37 Sep 77

Particular problems under discussion in the field of infant nutrition today are the following. (1) The frequency of breastfeeding including the effect of promotion to uncrease it. (2) The protein requirement of low birth weight infants including relevant parameters for evaluation of the requirement. Recent studies indicate that the protein requirement of low weight is only slightly higher (or may be the same) as that supplied by breast milk. (3) The tolerance for intake of certain nutrients in early infancy - mainly protein and minerals - in relation to the development of organ functions, including homeostatic disturbances that may arise when the tolerance is exceeded. Adverse effects of a too high protein intake are particularly acidosis and increased osmolar load on kidney function. Excess mineral adds to the renal solute load, implying a threat to water balance. (4) The introduction of Beikost, when and why, and (5) Atherosclerosis as a problem for the pediatrician. The need for identification of risk factors, especially screening for hyperilipidemia, in early life and for recommendation of dietary measures instituted in early childhood has to be further studied.
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PMID:Recent views on infant nutrition. 49 38

Results in animals and in man indicate that in many circumstances, lipemia is not closely related to the severity of atherosclerosis nor to the incidence of coronary heart disease (CHD) or the intake of saturated fats as observed in paired studies between farmers from Moselle and Var in France and from West and East Scotland. In rabbits, an increased response of platelets to thrombin occurs before any deposition of cholesterol, as a result of a saturated fat feeding. Under these conditions, the addition of alcohol to the drinking water decreases significantly both the platelet response to thrombin and the severity of atherosclerotic lesions without much affecting plasma cholesterol. In farmers from Moselle and Var (as well as from Scotland), platelet functions, namely the aggregation to thrombin and their clotting activity, i.e. PF3, are closely related to the intake of saturated fats, either as a result of the long-term feeding or of a 1 year change in the diet of Moselle farmers. Certain platelet functions appear to be the only blood parameter related to the incidence of CHD and significantly correlated on a group, as well as on an individual basis, with the intake of saturated fat, and inversely related with that of calcium. Saturated fats and calcium are known to be the two main dietary factors related to CHD. These results suggest that the intermediate link between dietary fats and CHD might be blood platelets rather than serum lipids, through an effect on both thrombosis and atherosclerosis.
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PMID:Dietary fats and platelet functions in relation to atherosclerosis and coronary heart disease. 51 Oct 11

The atheromas of adult aortas have been found to be composed mostly of tabular crystals of a highly insoluble cholesterol-cholestanol-water adduct designated C-C-2W. Early feeding of cholestanol risks precipitation of C-C-2W on the incomplete membranes of infants. Resultant impairment of cell permeability and reactivity can give rise to incipient atherosclerosis. The pathological condition becomes patent only with adulthood, when the aorta intima-media will be stacked with the adduct and fatty streaks will occur. Cholesterol, as provided by the usual dietary sources, contains from 3 to 10% of cholestanol, quantities more than sufficient to reach the solubility product of C-C-2W: 10(-7) mg/ml. It follows that much atherosclerosis could be avoided if cholestanol-containing foods, specifically dietary cholesterol, were not fed to infants or children. Cholestanolosis and hypercholestanolemia are new concepts to be considered in dietary approaches to control of atherosclerosis.
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PMID:Feeding cholestanol to infants causes atherosclerosis. 54 1

Guancydine (1-cyano-3-tert-amylguanidine) lowered within normal limits the tensional values in an interval of four hours after its administration in eight out of nine hypertensive patients under experiment. The hypotensive effect of a single oral dose of 500-750 mg persists for about 6-7 hours after its administration. Guancydine does not impair the vasopressor response to angiotensin II but reduces the action of this peptide on the excretion of water, Na, K and Ca through urine. The hypotensive effect of Guancydine is associated with a decrease of platelet adhesiveness and an activation of fibrinolysis. In view of this fact, Guancydine might play a role in the prophylaxis of complications of arterial hypertension - atherosclerosis and trombosis. The increase of venous blood oxygenation after Guancydine could be attributed to the opening of arterio-venous shunts or to the reduction of tissular extraction of oxygen. Guancydine does not seem to be toxic. It produced, in some patients, slight headache and orthostatic hypotension, especially during the first hours after administration.
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PMID:Guancydine, a new hypotensive agent with complex action. 56 30

However great the success in the therapy of hypertension, atherosclerosis and ischemic heart disease has been gained today by recent efficient drugs, the definite healing of patients is not yet attained. The late discovery of reserpine, such an efficient drug of plant origin against hypertension, convinced so far reluctant scientists to consider the chemical compounds of the plant world. With respect to this traditional medical knowledge, it seems necessary to define more accurately the specificity of these healings-sometimes recommended unspecifically for a whole branch of medicine. This experimental verification should not use inconsiderately the present-day classification of diseases; there should be an awareness that conventional experimental methods in pharmacology are often unsuitable for revealing the real biological activity of one or another medicinal plant. The interest in the millennial empirical field of health care is acknowledged by the World Health Organization which promotes research and development of traditional medicine, along with investigations into its psychosocial and ethnographic aspects. These studies cover a number of plants growing in Bulgaria that have a healing effect in hypertension, atherosclerosis and ischemic heart disease according to the data of traditional medicine. Using screening methods, extracts and chemically pure substances were investigated; extraction was done with solvents such as water, ether, chloroform, dichloretan, ethanol, methanol, and acetone. Most of the experiments were carried out on anesthetized cats, rabbits and dogs. The substances tested were applied mainly intravenously, and in some experiments orally. Chronic experiments were also carried out on wakeful dogs with induced hypertension, on animals fed on an atherogenic diet, and on animals with induced arrhythmia and coronary spasm. Data are presented of clinical examination of some plants or of active substances isolated from them. Major results of these studies are presented for the following plants: Garlic, Geranium; Hellebore; Mistletoe; Olive; Valerian; Hawthorn; Pseucedanum arenarium; Periwinkle; Fumitory. For another 50 plants growing in Bulgaria and in other countries the author presents his and other investigators' experimental and clinical data about hypotensive, antiatheromatous and coronarodilatating action.
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PMID:Plants and hypotensive, antiatheromatous and coronarodilatating action. 57 53

Colestipol hydrochloride, a polymeric, ion-exchange type, hypocholesterolemic agent, acting by sequestering bile acids, was labeled with carbon-14. The disposition of the labeled material was studied in the human, dog and rat. The extent of absorption from the gastrointestinal tract, as judged by urinary excretion of radioactivity, was very small and correlated well with the contents of water-soluble and dialyzable materials in the colestipol hydrochloride. Results were consistent with the dialyzable material in the drug being the absorbable species.
Atherosclerosis 1978 Jan
PMID:Preparation of [14C]colestipol hydrochloride and its disposition in the human, dog and rat. 62 28


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