Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0004153 (atherosclerosis)
 77,401 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

In aorta of intact rabbits the high activity of glutathione-peroxidase, which detoxicates lipoperoxides, was observed. In aorta of animals with pronounced experimental atheromatosis the enzyme activity did not distinctly differ from the control values. The animals with high initial content of glutathione-peroxidase in aorta were shown to be less subjected to the impairment in alimentary atherosclerosis.
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PMID:[Role of lipid peroxides in the pathogenesis of arteriosclerosis. Detoxication of lipid peroxides by the glutathione-peroxidase system in the aorta]. 1 99

It was established that in blood of patients with ischemic heart disease due to atherosclerosis of the coronary arteries (the diagnosis was verified in selective coronaroangiography) the content of acylhydroperoxides grows while the activity of glutathione-peroxidase II decreases. In blood of patients with no damage to the coronary vessels (according to the results of angiography), glutathione-peroxidase II activity does not differ significantly from the values in the control group. The decrease of glutathione-peroxidase II activity was most marked in patients with ischemic heart disease and hypercholesterolemia. It is suggested that the increase in the peroxide content in blood of patients with ischemic heart disease may be due to the sharp decrease in the activity of glutathione-peroxidase II.
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PMID:[Lipid peroxides and atherosclerosis. The enzymatic detoxication of lipid peroxides in the blood in ischemic heart disease due to coronary artery arteriosclerosis]. 45 35

Foam cell lesions were found in cholesterol-fed rabbits with induced hypertension, particularly in intimal cushions at branching sites, where permeability to horseradish peroxidase was enhanced. Permeability to horseradish peroxidase was enhanced at the edge of intimal cushions without foam cell accumulation. This finding suggests that permeability is increased before foam cell infiltration. No foam cell lesions were observed in the intima of cerebral arteries distant from branching sites, but insudation of plasma constituents here caused endothelial cells to separate from the subendothelial matrices. Foam cell lesions were absent from the cerebral arteries in normotensive cholesterol-fed rabbits.
Atherosclerosis 1978 Jun
PMID:Hypertension-induced cerebral atherosclerosis in the cholesterol-fed rabbit. 67 15

The selectively-bred substrains of spontaneously hypertensive rats with a greater vulnerability to vascular lesions rapidly developed arterial fat deposition within 1 or 2 weeks as well as a greater hypercholesterolemic response when fed on high fat cholesterol diet including 20% of suet, 5% of cholesterol and 2% of cholic acid. The ring-like arterial fat deposition at the branches of superior mesenteric arteries and cerebrobasal arteries, which was found to be good indices for the deposition of intrarenal or coronary arteries, was not observed in normotensive rats fed on high fat cholesterol diet for 3 months, greatly delayed in SHR under antihypertensive treatment and accelerated by 1% salt loading in drinking water. The horseradish peroxidase infused intravenously 1 to 4 hours before sacrifice leaked in ring-like forms which corresponded to the fat deposit in mesenteric arteries. The incorporation of 3H-proline infused 4 hours before sacrifice was enhanced in the mesenteric arteries with the fat deposition. These results clearly indicated that hypertension was a great contributory factor to rapid arterial fat deposition, which was caused by an increased vascular permeability and enhanced the arterial collagen formation, the initiation process of arterio- or atherosclerosis.
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PMID:Pathogenesis of acute arterial fat deposition in spontaneously hypertensive rats. 115 92

In 6 normal rabbits, the aortic arch, the descending thoracic and the abdominal aorta were tested for non proteic thiol compounds, selenium-dependent and selenium-independent glutatione peroxidase, glutatione reductase, glutatione transferase and thiobarbituric acid reactive substances. The aortic arch showed the greatest content of non proteic thiol compounds and thiobarbituric acid reactive substances, associated to the highest activities of glutathione-related enzymes. However, not significant differences were detectable between aortic arch and descending thoracic aorta, except for the glutathione transferase activity (0.395 +/- 0.031 vs 0.330 +/- 0.053 U/mg protein, p less than 0.05). Furthermore, both aortic arch and descending thoracic aorta showed significantly higher values of non proteic thiol compounds (46.05 +/- 10.15% and 33 +/- 13.5%, p less than 0.05), selenium-dependent glutathione peroxidase activity (70.35 +/- 26% and 54.3 +/- 9.5%, p less than 0.05), glutathione reductase activity (25.4 +/- 7% and 18.4 +/- 4.5%, p less than 0.05) and thiobarbituric acid reactive substances (65.8 +/- 18% and 47.2 +/- 17%, p less than 0.05) with respect to the abdominal aorta. The selenium-independent glutathione peroxidase activity was not detectable. In conclusion, a biochemical gradient in glutathione-related antioxidant defences and thiobarbituric acid reactive substances proceeding from the proximal to the distal segments seems to exist in the normal rabbit aorta. These results could contribute to explain the non homogeneous distribution of experimental atherosclerosis in the rabbit aorta.
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PMID:Regional distribution of glutathione-related antioxidant defences in the normal rabbit aorta. 204 54

We have investigated whether any of the three isoforms of endothelin (ET) ET-1, ET-2 and ET-3 or the structurally similar peptide sarafotoxin S6b is mitogenic on its own for rat vascular smooth muscle cells in culture. DNA synthesis was determined by a peroxidase-linked double antibody technique to detect bromodeoxyuridine incorporation into the nucleus and stained nuclei were counted by image analysis. None of the ET peptides or sarafotoxin S6b (up to 100 nM) was capable of initiating DNA synthesis in the absence of platelet derived growth factor (PDGF) or fetal calf serum. All the peptides potentiated the mitogenic effect of low concentrations of PDGF. ET-1 and ET-2 (10 nM) caused a 2-fold increase in the number of stained nuclei induced by 5 nM and 10 nM PDGF, whereas ET-3 and sarafotoxin S6b were less potent. These findings demonstrate that ET is a co-mitogen for rat vascular smooth muscle cells. The release of ET at sites of endothelial injury may therefore enhance the mitogenic action of locally acting PDGF on vascular smooth muscle cells and potentiate the proliferative response.
Atherosclerosis 1990 Dec
PMID:The endothelin peptides ET-1, ET-2, ET-3 and sarafotoxin S6b are co-mitogenic with platelet-derived growth factor for vascular smooth muscle cells. 210 88

Atherosclerotic lesions are characterized by lipid infiltration in regions with high rates of endothelial cell turnover. The present investigation was designed to elucidate the route of macromolecular transport across vascular endothelium. The aorta and vena cava of male Sprague-Dawley rats were perfusion-fixed after the intravenous injection of Evans-blue albumin (EBA) or horseradish peroxidase (HRP). Fluorescence microscopic examination of en face preparation of the aorta stained with hematoxylin allowed the identification of endothelial cells that underwent mitosis, together with the localization and quantification of fluorescent spots for EBA leakage. The HRP specimens were subjected to histochemical treatment, and HRP leakage was seen as brown spots under the light microscope. Silver nitrate stain was added in both EBA and HRP studies to outline cell boundaries and to visualize stigmata, stomata, and dead cells. In the aorta, almost every dividing cell showed junctional leakage to albumin and HRP, with clustering of leaky spots around the branch orifices. Time-dependent studies showed gradual increases in the diameter and number of these heterogeneously sized leaky spots, which finally fused to sizes corresponding to the "blue areas" for EBA or "brown areas" for HRP. Compared with arteries, veins had fewer mitotic cells, but more dead cells and diffuse dye-staining areas, indicating a more rapid transport of macromolecules. The leaky spots in the artery were associated mainly with mitotic cells, dead cells, and stigmata, whereas those in the vein occurred primarily at regions with dead cells. These results suggest that the preferential association of the enhanced transport of macromolecules with mitosis in the arterial as compared to venous endothelium and the differential behavior in transmural transport between arteries and veins may form the basis for the predilection of atherosclerosis in arteries.
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PMID:Macromolecular transport across arterial and venous endothelium in rats. Studies with Evans blue-albumin and horseradish peroxidase. 218 Mar 95

In members of the families whose parents had atherosclerosis complicated by macrofocal myocardial infarction or stroke, the serum level of lipid peroxidation products was correlated to enzymatic activity of neutrophil and red blood cells oxidation-antioxidation. In persons with hereditary predisposition to atherosclerosis both with clinical signs of atherosclerosis and phenotypically healthy against the control group there was elevated content of plasma acylhydroperoxides and hypoactivity of neutrophil myeloperoxidase. Determination of lipid peroxidation products by malonic dealdehyde showed this parameter to be higher in members of the families of the study group and in those with cardiovascular disorders. For those whose parents had atherosclerosis versus control subjects there were no differences in the activity of superoxide dismutase, glutation peroxidase and catalase in the blood red cells. Shifts in lipid peroxidation and activity of blood myeloperoxidase are identical in type and may represent a pathogenetic ling in formation of hereditary predisposition to cardiovascular disorders of atherosclerotic origin, the detection of which becomes feasible in a subclinical period.
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PMID:[Indicators of lipid peroxidation in the blood in hereditary predisposition to arteriosclerosis]. 233 43

This new, sensitive, specific "sandwich"-type enzyme-linked immunosorbent assay (ELISA) for quantifying lipoprotein(a) [Lp(a)] in human serum and in ultracentrifugal lipoprotein fractions is based on use of a monoclonal antibody raised against apolipoprotein(a) as coating protein and a polyclonal antibody, raised against either apo B or against Lp(a) and conjugated with peroxidase, for detection of bound Lp(a). Mean intra- and interassay CVs for assay of 16 samples were 3.0% and 5.6%, respectively. Sample pretreatment with urea did not enhance Lp(a) immunoreactivity, and treatment with nonionic detergents decreased binding to the monoclonal antibody. Results correlated well (r = 0.99, n = 38) with those by radial immunodiffusion (RID). The ELISA assay, however, detects amounts corresponding to Lp(a) contents of 10 to 1000 mg/L in plasma samples diluted 1000-fold, compared with 100-500 mg/L for RID. For 92 normolipidemic subjects, the mean Lp(a) concentration was 120 (SD 130) mg/L. In patients undergoing coronary angiography, Lp(a) concentrations increased with the severity of the disease but were not correlated with either HDL cholesterol, triglycerides, apo A-I, or apo B, and only weakly with plasma cholesterol and apo A-II. These two correlations were even weaker in normal subjects, and only the correlation with total cholesterol was valid. Lp(a), measured at birth and at seven days and six months, steadily increased with age. This assay is well suited for measuring Lp(a) in plasma and in lipoprotein fractions and also for screening programs evaluating this significant genetic risk factor for the development of atherosclerosis.
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PMID:Lipoprotein(a) quantified by an enzyme-linked immunosorbent assay with monoclonal antibodies. 252 93

Activity of blood plasma myeloperoxidase (MPO) of neutrophil leucocytes and acetyl hydroperoxides was studied in families of atherosclerosis patients. The neutrophil MPO activity was decreased and the blood plasma content of acetyl hydroperoxides was increased in subjects with hereditary predisposition to atherosclerosis. The role of MPO and its possible pathogenetic action as a generator of the active forms of oxygen in atherosclerosis and its complications has been discussed.
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PMID:[Myeloperoxidase of neutrophils and its possible role in lipid peroxidation processes in arteriosclerosis]. 255 Jul 1


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