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

In vitro cholesteryl synthesis from oleic acid [1-14C] was studied with enzyme preparations from human thoracic aorta and liver. Results from studies on the properties of the esterifying system provide good evidence that the mechanism involves fatty acyl-CoA-cholesterol acyl transferase. In studies on human thoracic aorta with varying degrees of atherosclerotic disease, and pairs of normal and diseased aorta from the same subject, there was no obvious relationship between aortic cholesteryl esterifying activity and severity of atheroma. Normal aorta from two young males, presumably free of atherosclerosis, had relatively very low esterifying activity. In the six liver samples tested, there was negligible esterifying activity, in contrast to the high activity seen in the case of rat liver. For the thin layer chromatographic isolation of the labeled cholesteryl oleate a solvent system of isooctane:diethyl ether (100:6) was found to give a better separation of the ester than the petroleum ether: diethylether:acetic acid system generally used.
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PMID:Studies on cholesterol esterification in human tissues. 2 46

Studies were undertaken on the immune reactions in aging at cerebral atherosclerosis and parkinsonism. With age a number of changes occurred, which were characterized by a decrease in specific and non-specific immunity, against the background of which the autoimmune reactions were developing. There was an increase in the frequency of the detection of antibodies to antigens of the brain as well as in those of the aorta, heart, liver and pancreatic gland. The "peak" of autoimmune reactions was registered at 65 years in men and 75 years in women. There were lymphocytes in the peripheral blood, which together with homologic antigens inhibited the migration of macrophages. In subjects aged 90 years and over the autoantibodies occurred in a lower percent of cases as compared with the subjects aged 60--74. In subjects aged 45--55 with cerebral atherosclerosis the indices under study appeared to be close to those in healthy persons aged 60--74. Still more marked immunological shifts were found in patients with parkinsonism. The findings may suggest a certain role of the autoimmune mechanisms in pathogenesis of some forms of nervous pathology at late stages of ontogenesis and atherosclerosis.
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PMID:[Autoimmune phenomena in the aging, cerebral atherosclerosis, Parkinsonism (author's transl)]. 3 Mar 28

The opinion is emerging that beta-blocking drugs have an important role in management of patients following acute myocardial infarction. Already beta-blocking drugs are accepted as the treatment of choice in hypertension and in angina pectoris--in the major risk factor and consequence respectively of coronary atherosclerosis, and both commonly recognized in patients who survive acute myocardial infarction. But beta-blocking drugs also may be of benefit in reducing the incidence and risk of subsequent infarction, and so may be of value for long term treatment of patients who have no symptoms whatever following acute infarction.
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PMID:The role of long term beta-blockade after myocardial infarction: Paper 1. 3 Apr 41

Cholesterol ester hydrolase activity was determined in preparations of rabbit and guinea pig aorta utilizing micellar and glycerol-dispersed cholesterol oleate substrates. Both substrate preparations demonstrated an acid pH optimum of 4--5 for the soluble and particulate rabbit media cholesterol ester hydrolase, suggesting a lysosomal origin for this activity. Approximately one-fifth of the total recovered activity was particulate. Particulate media preparations from guinea pig aorta also demonstrated cholesterol ester hydrolase activity at acid pH values with a definite optimum at pH 5 for the glycerol-dispersed substrate. However, in contrast to the rabbit media enzyme, activity was also observed at neutral pH with another optimum at pH 7. The supernatant enzyme from guinea pig media exhibited only a single pH optimum of 7. Cholesterol ester hydrolase activity from either rabbit or guinea pig media was not influenced by preincubation with cyclic AMP, ATP and protein kinase. The addition of chloroquine resulted in the inhibition of both the rabbit and guinea pig enzyme. Cholesterol ester hydrolase activity from rabbit and guinea pig media was also inhibited by phenyl methane sulfonyl fluoride; activity measured at pH 7 (guinea pig) was more sensitive to inhibition than activity measured at pH 5 (guinea pig and rabbit).
Atherosclerosis 1978 Sep
PMID:Characterization of cholesterol ester hydrolase activities in rabbit and guinea pig aortas. 3 Apr 61


Atherosclerosis 1978 Dec
PMID:Effects of some benzodiazepine derivatives on fibrinolysis and serum lipids in normolipidaemic rats and in humans. 3 94

Arteriosclerosis is caused by many factors. These pathogenic factors especially over-nutrition, nicotinabusus, deficiency of muscular exercise, muscular overstrain, emotional stress and concomitant basic diseases, especially arterial hypertension, diabetes mellitus and dyslipidemia are the most important points for preventive and therapeutical action. When possible the risk factors has to be eliminated, arterial hypertension, diabetes mellitus and dyslipidemia have to be treated orderly. In the pathogenesis of arteriosclerosis and atherosclerosis are known disturbances of the lipid metabolism, the blood coagulation and the metabolism of the arterial wall cells most important. Application of anticoagulants and lipid lowering medicaments did not come up to our expectations. Experiences with animal models and a double blind study (secondary prevention of myocardial infarction) have given good reason for recommending antirheumatic or as we like to say, mesenchyme suppressive drugs.
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PMID:[Prevention and therapy of arteriosclerosis (author's transl)]. 3 60

Aortic smooth muscle cell death is an important initial lesion of atherosclerosis. A number of autooxidation products of cholesterol which has been recognized recently has the capability of inducing rabbits' aortic smooth cell death in vitro. Twelve oxidation derivatives of cholesterol, available commercially, were dissolved in small amounts of ethanol, then added to the culture medium at levels not exceeding 0.8%. The medium contained 10% fetal calf's serum which served as an in situ vehicle for the sterols. The degrees of cytotoxicity were graded and measured as percentage of dying and dead cells in the cultures within 24 hr. 25-Hydroxycholesterol and cholesthan-3 beta, 5 alpha, 6 beta-triol, were the most toxic compounds among the sterols tested. When these oxidation derivatives of cholesterol were added to these cultured cells, they significantly depressed activity of 3-hydroxy-3-methylglutaryl coenzyme A reductase, a regulatory enzyme of cholesterol biosynthesis (up to 83% inhibition by 25 hydroxycholesterol at a 3 microgram/ml concentration in culture medium) but the sequence of degree of inhibition was not exactly correlated with that of cytotoxicity. Various mechanisms are speculated. Purified cholesterol showed no cytotoxic effect and minimal inhibition of cholesterol biosynthesis.
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PMID:Cytotoxicity of oxidation derivatives of cholesterol on cultured aortic smooth muscle cells and their effect on cholesterol biosynthesis. 3 98

Over the past decade, research in blood platelet physiology has led to the suggestion that platelets play an important part in the pathogenesis and complications of coronary artery disease. Occlusive intravascular platelet aggregates have been shown to cause ischemic myocardial damage in the experimental animal and to be present in some patients who die suddenly. The interplay between endothelial damage and platelet aggregation has been implicated in the etiology of atherosclerosis. Products released from platelets during aggregation may cause arterial spasm. Patients with overt ischemic heart disease and with the risk factors associated with coronary artery disease have been found to have abnormally reactive platelets. Clinical studies of drugs that inhibit platelet aggregation have been reported to show a beneficial effect in preventing cardiac deaths or myocardial infarction; other studies have been negative or shown only a trend toward benefit. This report reviews the theoretical and experimental basis for the platelet hypothesis and the current data on the use of antiplatelet drugs in patients with coronary disease.
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PMID:Role of blood platelets in coronary artery disease. 3 67

Twenty eight subjects with noisy circulation sindrome (NCS) defined as cases at least, with 4 murmurs in different arteries were studied. They were divided in groups A, B, C formed by 9 normal children, 9 peripheral vascular atherosclerosis adults and 10 Takayasu's arteritis cases, respectively. In the whole population a complete chronometric arterial auscultation and in groups B and C an arteriography of at least 3 arteries with murmurs, were performed. Groups A, B and C had 40, 50 and 37 arterial murmurs, respectively, which were predominantly localized in supraortic trunks, pelvic and phemoral arteries, and supraortic and abdominal regions, respectively. 100, 19.1 and 21.1% of
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PMID:[Noisy circulation syndrome. Study of 28 cases]. 3 22

Cholesterol esterase activity was estimated in homogenates of rat arterial wall using radioactive cholesteryl oleate incorporated into phospholipid vesicles as a substrate. The labeled oleic acid was separated from the ester by addition of benzene-chloroform-methanol mixture. Under these conditions, two pH optima were found at about 4.5 and 7.5. Most of the activities at pH 4.5 and 7.5 were found in the lysosomal and microsomal fraction, respectively. No enzyme activity was detected when the substrate vesicles were prepared with phosphatidylethanolamine or sphingomyelin, but the activity was higher when the substrate vesicles were prepared with phosphatidylserine and highest when they were prepared with phosphatidylcholine. The relationship between enzyme regulation and lipid deposition in the arterial wall is discussed.
Atherosclerosis 1979 Jul
PMID:Studies of cholesterol esterase in rat arterial wall. 3 82


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