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Norcia LN. Concurrent oxidation of cholesterol and corn oil sterols in autoxidizing lipid films. J AM OIL CHEM SOC 2018. [DOI: 10.1007/bf02636767] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- L. N. Norcia
- Cardiovascular Section; Oklahoma Medical Research Institute; Oklahoma City
- ; Department of Biochemistry; University of Oklahoma School of Medicine; Oklahoma City
- ; Departments of Physiological Chemistry and Physiology; Temple University School of Medicine; Philadelphia Pa
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Crabbé P, Azpeitia EA, Djerassi C. Stéroïdes et Terpénoïdes de Différentes Espèces D'Irésine. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bscb.19610700307] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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3
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Robert J, Mandel P, Rebel G. NEUTRAL LIPIDS AND PHOSPHOLIPIDS FROM CULTURED ASTROBLASTS. J Neurochem 2006. [DOI: 10.1111/j.1471-4159.1976.tb04449.x-i1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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4
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Cunha RA, Constantino MD, Fonseca E, Ribeiro JA. Age-dependent decrease in adenosine A1 receptor binding sites in the rat brain. Effect of cis unsaturated free fatty acids. ACTA ACUST UNITED AC 2001; 268:2939-47. [PMID: 11358511 DOI: 10.1046/j.1432-1327.2001.02183.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Unsaturated free fatty acids and adenosine operate two neuromodulatory systems with opposite effects on neuronal function. Here, we tested if fatty acids controlled inhibitory adenosine A1 receptors. Arachidonate (AA, 10 microM) decreased the Bmax of an A1 receptor agonist, (R)-[3H]phenylisopropyladenosine (PIA; from 812 to 267 fmol x mg(-1) protein), and antagonist, [3H]1,3-dipropyl-8-cyclopentylxanthine (DPCPX; from 994 to 311 fmol x mg(-1) protein) and decreased the Kd of [3H]PIA (from 1.20 to 0.57 nM) binding to brain membranes of young adult rats (2 months old), these effects being mimicked by other cis but not trans unsaturated or saturated fatty acids. AA (10 microM) increased the potency of the A1 receptor agonist, 2-chloroadenosine to inhibit hippocampal synaptic transmission in young adult rats (EC50 decreased from 337 to 237 nM), which may constitute a safety feedback mechanism to control AA-induced neurotoxicity. Upon aging, there were increased free fatty acid levels and a concomitant decreased density of A1 receptors. This was more marked in hippocampal nerve terminals of aged rats (24 months old) and may be the determinant factor contributing to the lower potency of 2-choloroadenosine in aged rats (EC50 = 955 nM), in spite of the decreased Kd of PIA binding upon aging. The effects of AA on A1 receptor binding were attenuated upon aging, AA being devoid of effects in aged rats. Accordingly, AA (10 microM) failed to modify the potency of 2-choloroadenosine in aged rats (EC50 = 997 nM). However, albumin, which quenches free fatty acids, increased A1 receptor density by 65% and 2-chloroadenosine potency (EC50 = 703 nM) in aged rats, suggesting that the increased fatty acids levels in aged rats may contribute to the decreased potency of A1 receptor agonists in aged rats. Also, the observed saturation of the control by AA of A1 receptors may contribute to the decreased adaptability of neuromodulation to different firing conditions in aged rats.
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Affiliation(s)
- R A Cunha
- Laboratory of Neurosciences, Faculty of Medicine, University of Lisbon, Lisbon, Portugal.
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Abstract
The lipid composition of plasma membranes isolated from bovine adrenal chromaffin cells has been determined. Choline and ethanolamine phosphatides were predominant; the level of lyso compounds was very low. The amount of cholesterol and the cholesterol/phospholipid molar ratio was low compared to those of the other subcellular fractions of chromaffin cells. A complex pattern of neutral glycolipids was observed in contrast to that of gangliosides.
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Montaudon D, Robert J, Canguilhem B. Fluorescence anisotropy of kidney lipids and membranes of a hibernating mammal. Cryobiology 1986; 23:177-83. [PMID: 3698645 DOI: 10.1016/0011-2240(86)90009-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The fluorescence anisotropy of lipids and membranes isolated from kidneys of European hamsters (Cricetus cricetus L.) has been estimated using 1,6-diphenyl-1,3,5-hexatriene as a probe. We have compared in this study the results obtained for two critical periods for a hibernator: winter (torpid state), and summer (active state). The differences were of very low magnitude. A slight increase in anisotropy was noticed in the kidney lipids and microsomal membrane preparations from torpid animals. In contrast, a small decrease in anisotropy was observed in the microsomal lipid extracts of torpid animals. A difference in triglyceride content of winter and summer total kidney lipids was detected, as well as a difference in microsomal protein content between winter and summer membrane preparations. It is hypothesized that the latter observations may explain why the behavior of kidney total lipids and microsomal preparations were different from that presented by kidney microsomal lipids in respect to fluorescence anisotropy. Therefore, only a little, if any, homeoviscous adaptation is exhibited by kidney membranes during hibernation of this mammal.
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Abstract
Brain myelin was studied in genetically obese (ob/ob) mice and compared with that of normal (+/+) mice from the same strain. The brain from obese mice had a significantly lower amount of myelin, and marked changes in the fatty acid composition of myelin were observed. In contrast, the myelin cholesterol: phospholipid: galactolipid and the cerebroside: sulfatide molar ratios and also the phospholipid composition were normal. 2',3'-Cyclic nucleotide 3'-phosphohydrolase (CNP) and UDP-galactose ceramide galactosyltransferase (CGalT) enzymatic activities were normal, and 3'-phosphoadenosine 5'-phosphosulfate (PAPS): cerebroside sulfotransferase (CST) was only slightly decreased. Cholesterol esters were not present in the mutant. These results indicate that brain myelination is affected in obese mutant mice.
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Gabellec MM, Steffan AM, Dodeur M, Durand G, Kirn A, Rebel G. Membrane lipids of hepatocytes, Kupffer cells and endothelial cells. Biochem Biophys Res Commun 1983; 113:845-53. [PMID: 6870894 DOI: 10.1016/0006-291x(83)91076-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The membrane lipid composition of isolated hepatocytes, Kupffer cells and endothelial cells was determined. The hepatocytes are characterized by a lower quantity of gangliosides, cholesterol, sphingomyelin and a reduced cholesterol/phospholipid molar ratio when compared to the two other liver cell types. The main gangliosides of Kupffer and endothelial cells are the GM3 species, and those of hepatocytes are of the polysialogangliosides species.
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Sena A, Rebel G, Bieth R, Hubert P, Waksman A. Lipid composition in liver and brain of genetically obese (ob/ob), heterozygote (ob/+)and normal (+/+) mice. BIOCHIMICA ET BIOPHYSICA ACTA 1982; 710:290-6. [PMID: 7074117 DOI: 10.1016/0005-2760(82)90111-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Lipid composition was studied in liver and brain of normal (+/+), heterozygote (ob/+) and obese (ob/ob) mice. It was found that this genetic defect is expressed differently in the lipid composition of these organs. Cholesterol is increased in liver but strongly decreased in brain of obese animals. Phosphatide fatty acid composition is modified in liver and not in brain. In contrast, phospholipids and total ganglioside sialic acid are affected similarly in both organs. Although clinically normal, heterozygote (ob/+) mice already show an abnormal lipid composition in liver and brain. The potential importance of these results is presented.
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12
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Robert J, Montaudon D, Dubourg L, Rebel G, Miro JL, Canguilhem B. Changes in lipid composition of the brain cellular membranes of an hibernating mammal during its circannual rhythm. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. B, COMPARATIVE BIOCHEMISTRY 1982; 71:409-16. [PMID: 7067403 DOI: 10.1016/0305-0491(82)90402-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The lipid composition of whole brain hemispheres and subcellular fractions of European Hamsters (Cricetus cricetus) was investigated at four different periods of the year. 1. No difference was observed in winter between hibernating animals and active animals awake for 24 hr. 2. A slight increase of cholesterol/phospholipid molar ratio was observed in winter. 3. A slight increase of the ratio ethanolamine phosphoglycerides/choline phosphoglycerides was observed in summer and autumn. 4. Some changes in sugar moieties proportions of gangliosides were observed, with a tendency of increased polysialylation in winter. 5. An increase of docosahexaenoic acid was observed in summer, while a slight increase of linoleic acid and of the monounsaturated fatty acids was observed in winter. These changes were mainly exhibited in the synaptosomal fraction. All the changes observed were of very small magnitude and might not be sufficient for the maintenance of a fluid state of membranes during hibernation.
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Tagliavini F, Pietrini V, Gemignani F, Lechi A, Pallini R, Federico A. Anderson-Fabry's disease: neuropathological and neurochemical investigation. Acta Neuropathol 1982; 56:93-8. [PMID: 6278815 DOI: 10.1007/bf00690579] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
A clinical, neuropathological and neurochemical study of a case of Anderson-Fabry's disease is described. The clinical course mainly consisted of repeated ictus with major involvement of the CNS. The neuropathological examination is dominated by severe alterations in the cerebral vessels due to glycolipid deposits on the walls, with reduction or occlusion of the lumen. This is correlated with secondary ischaemic foci scattered throughout the cortex as well as through the white matter. In addition, the cells of the cerebral cortex, thalamus, basal ganglia, amygdala, cerebellar and olivary nuclei show a marked accumulation of lipofuscin. Biochemical examination reveals a threefold increase in galactolipids due to the specific alpha-galactosidase deficiency. Cholesterol is reduced secondarily to ischaemic myelin damage. Glycosaminoglycans uronic acid is increased in cytosol and membrane-bound fractions which could be related to reactive gliosis. Glycoprotein sugars show a decrease in N-acetyl-neuraminic acid and fucose as well as an increase in hexosamines and hexoses in membrane-bound fraction, while in cytosol fraction all sugars are increased. This suggests that the alpha-galactosidase deficiency can alter not only the glycolipid but also the glycoprotein metabolism, resulting in a higher presence of hexosamines and hexoses-rich glycoproteins.
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Sarkar CP, Cenedella RJ. Reactivity of key metabolic sterols in standard colorimetric assays for cholesterol. Lipids 1982; 17:46-9. [PMID: 6177997 DOI: 10.1007/bf02535121] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The reaction of lanosterol, desmosterol and 7-dehydrocholesterol, key intermediates in cholesterol biosynthesis, were-compared with cholesterol in 3 standard colorimetric assays for cholesterol based on formation of chomogens with acetic anhydride, ferric chloride and ferrous sulfate. Marked differences in the reaction of the sterols in the different assays were due both to formation of chomogens with qualitatively similar spectral patterns but with greatly different extinctions and to formation of chromogens with clearly different absorption maxima. For example, in all assays, cholesterol and desmosterol formed chromogens with very similar absorption spectra but with varying extinctions, whereas the lanosterol chromogen in all assays was different from cholesterol's in both absorption maxima and in extinctions. The findings show that attempts to measure tissue sterol levels by colorimetric methods can result in greater errors when cholesterol is not the sole sterol. Also, the unique spectral properties of the lanosterol chromogen formed in the Liebermann-Burchard reaction (a sharp absorption peak at 450 nm) suggests the possible use of this method as a qualitative test for lanosterol.
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Federico A, Robert J, Zanetta JP, Guazzi GC. Sanfilippo A syndrome (mucopolysaccharidosis III A): a neurochemical study. ITALIAN JOURNAL OF NEUROLOGICAL SCIENCES 1981; 2:119-27. [PMID: 6800974 DOI: 10.1007/bf02335431] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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16
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Antioxidant for fats and oils from canary seed: Sterol and triterpene alcohol esters of caffeic acid. J AM OIL CHEM SOC 1980. [DOI: 10.1007/bf02662051] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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17
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Ahuja KL, Bajaj KL. Colorimetric determination of sterols in vegetable oils with chloramine T and sulfuric acid reagent. J AM OIL CHEM SOC 1980. [DOI: 10.1007/bf02668253] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- K. L. Ahuja
- ; Department of Plant Breeding; Punjab Agricultural University; 141004 Ludhiana India
| | - K. L. Bajaj
- ; Department of Vegetable Crops; Punjab Agricultural University; 141004 Ludhiana India
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Abstract
A biochemical study of a case affected by Creutzfeldt-Jakob disease is reported. Changes were found in soluble and insoluble proteins, glycoproteins and mucopolysaccharides and in total lipids, glycolipids, phospholipids and gangliosides. Also CNPase, choline acetyltransferase, 5'-nucleotidase and several glycosidases have an altered activity. All these data give a complete neurochemical pattern of the changes underlying the morphological and functional alterations in this disease.
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Robert J, Mandel P, Rebel G. Membrane lipids in bromodeoxyuridine-differentiated astroglial cells in culture. Lipids 1979; 14:852-9. [PMID: 502763 DOI: 10.1007/bf02534128] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Embryonic hamster astroblasts (NN strain) grown in continuous line were cultivated in the presence of bromodeoxyuridine (BrdU). A decrease in the growth rate of the cells and striking changes in their morphology were observed, the morphology of the cells resembling that of mature astrocytes. Membrane lipids of BrdU-differentiated and standard cells were compared. No modification of the lipid/protein ratio was observed. Phospholipids and cholesterol were increased in the same proportions in the cells, and no modification of the phospholipid distribution was observed. Ganglioside sialic acid remained at the same level, but the ganglioside distribution was highly modified. Complex gangliosides appeared (GM1 and GD1a), while the proportion of simple gangliosides (GM3 and GD3) decreased. However, neither GT1 nor GQ1 were detected in differentiated cells. The distribution of phosphoglyceride acyl groups was highly modified, the proportion of arachidonic and docosapentaenoic acids being 2 to 3 times higher in BrdU-treated cells than in proliferating ones. These results were compared to those obtained with another clonal line of glial cells (C6) which exhibited no morphological differentiation in the presence of BrdU; the lipids of these cells were not modified by such a treatment.
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Robert J, Rebel G, Mandel P. Utilization of polyunsaturated fatty acid supplements by cultured neuroblastoma cells. J Neurochem 1978; 30:543-8. [PMID: 681930 DOI: 10.1111/j.1471-4159.1978.tb07807.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Robert J, Rebel G, Mandel P, Yavin E. Polar head groups manipulation of phospholipids in cultured neuroblastoma cells. Life Sci 1978; 22:211-5. [PMID: 628312 DOI: 10.1016/0024-3205(78)90539-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Changes in brain components during the development of mice homozygous for the locus ?dwarf? (dw)1,5. Neurochem Res 1977; 2:11-25. [DOI: 10.1007/bf00966018] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/13/1976] [Indexed: 10/26/2022]
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Cmelik SH, Ley H. Composition of adrenal lipids from some domestic and wild ruminants. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. B, COMPARATIVE BIOCHEMISTRY 1977; 56:267-70. [PMID: 318243 DOI: 10.1016/0305-0491(77)90013-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
1. Lipids from the whole adrenal glands of the ox and the African buffalo (Syncerus caffer) were extracted and fractionated into neutral and phospholipids. Both species revealed the presence of considerable quantities of cholesterol but only very small quantities of cholesteryl esters. 2. Fatty acids from various fractions of bovine and buffalo adrenal glands were investigated by gas-chromatography. They showed a remarkably low content of higher unsaturated fatty acids and a very high content of stearic acid. 3. Mitochondrial and microsomal fractions were isolated from the adrenal glands of the impala antelope (Aepyceros melampus), their lipids extracted, analyzed and compared with the composition of the mitochondrial lipids from bovine adrenal glands. 4. Subcellular fractions of the bovine and impala adrenal glands contain only very small quantities of esterified cholesterol. Most of the lipid fractions were characterized by the absence of adrenic acid (C22:4 omega 6) and a low content of arachidonic acid.
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Affiliation(s)
- S H Cmelik
- Department of Biochemistry, University of Rhodesa Salisbury
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Sweeney JP, Weihrauch JL. Summary of available data for cholesterol in foods and methods for its determination. CRC CRITICAL REVIEWS IN FOOD SCIENCE AND NUTRITION 1976; 8:131-59. [PMID: 801350 DOI: 10.1080/10408397609527220] [Citation(s) in RCA: 45] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A search of the literature has been conducted on the cholesterol content of foods and on the methods for its determination. The amount of cholesterol in food is important because of its possible relationship to the onset of atherosclerosis in humans. Cholesterol is present primarily in foods of animal origin. The main sources in the American diet are eggs, poultry, dairy products, fish and seafood, and meat products. Only a few samples of these products have been analyzed. In many cases there is a wide range in cholesterol values for samples analyzed. Much of the research was conducted many years ago. The most commonly used methods were gravimetric or colorimetric. In many cases the samples investigated were not adequately described. Cholesterol was often determined without isolating it from interfering materials. Although some of the cholesterol values reported in the literature appear to be reasonably accurate, there is an urgent need for reinvestigation of the cholesterol content of foods using more recently developed methods of analysis.
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Yasuda S. Sterol compositions of sea squirts (Ascidiacea). COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. B, COMPARATIVE BIOCHEMISTRY 1975; 50:399-402. [PMID: 1116342 DOI: 10.1016/0305-0491(75)90248-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Kagawa H. Polymerization of flagellin into P-filament in the presence of deoxycholate. BIOCHIMICA ET BIOPHYSICA ACTA 1973; 317:114-22. [PMID: 4723240 DOI: 10.1016/0005-2795(73)90203-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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The lipid composition of adult rat brain synaptosomal plasma membranes. BIOCHIMICA ET BIOPHYSICA ACTA (BBA) - BIOMEMBRANES 1972. [DOI: 10.1016/0005-2736(72)90365-3] [Citation(s) in RCA: 300] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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D'Hollander F, Chevallier F. Estimation qualitative et quantitative des stérols libres et esterifies du rat in toto et de 23 de ses tissus ou organes. ACTA ACUST UNITED AC 1969. [DOI: 10.1016/0005-2760(69)90083-6] [Citation(s) in RCA: 42] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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37
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Swindell AC, Gaylor JL. Investigation of the Component Reactions of Oxidative Sterol Demethylation. J Biol Chem 1968. [DOI: 10.1016/s0021-9258(18)91903-4] [Citation(s) in RCA: 47] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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38
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Dvornik D, Hill P. Effect of long-term administration of AY-9944, an inhibitor of 7-dehydrocholesterol Δ7-reductase, on serum and tissue lipids in the rat. J Lipid Res 1968. [DOI: 10.1016/s0022-2275(20)42704-x] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Kraml M, Dubuc J, Dvornik D. Agents affecting lipid metabolism. XXVI. Specificity of some inhibitors of the late stages of cholesterol biosynthesis. Lipids 1967; 2:5-7. [PMID: 17805713 DOI: 10.1007/bf02531992] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/1966] [Indexed: 10/23/2022]
Abstract
The capacity of 22,25-DAC, AY-9944 and triparanol to inhibit cholesterol biosynthesis from three precursors, mevalonate, 7-dehydrocholesterol and desmosterol, has been studied in rat liver homogenates.Evidence is presented that, in vitro, 22,25-DAC, a potent inhibitor of the sterol Delta(24)-reductase, also inhibits the 7-dehydrocholesterol-Delta(7)-reductase system.
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Affiliation(s)
- M Kraml
- Department of Biochemistry, Ayerst Research Laboratories, Montreal, Canada
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42
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Saito A, Idler DR. Sterols in Irish moss (Chondrus crispus). CANADIAN JOURNAL OF BIOCHEMISTRY 1966; 44:1195-9. [PMID: 5968606 DOI: 10.1139/o66-136] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Sterol was isolated from Irish moss (Chondrus crispus) harvested in Nova Scotia. The principal sterol was identified as cholesterol by thin-layer chromatography, gas–liquid chromatography, infrared spectra, and chemical constants of the sterol and its derivatives. The total and free sterol content of the dry seaweed were 0.012% and 0.011% respectively. The crude sterol contained 1.75% of a 5,7-dienol.
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43
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Norcia LN, Rosenthal BE. Sterol content of some plant oils; further observations on fast-reacting sterols. J AM OIL CHEM SOC 1966; 43:168-70. [PMID: 5907623 DOI: 10.1007/bf02646295] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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44
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Abstract
Fourteen species (six genera) of wood-rotting basidiomycetes cultured in a chemically defined medium were examined for the presence of sterol material. These fungi were found to contain ergosterol in amounts that ranged in value from 0.017 to 0.42% of their mycelial dry weights. Such values are, in general, comparable to sterol values reported for other fungi.The synthesis of sterol by Fomes meliae was found to accompany active growth of the fungus and was quantitatively influenced by the composition of the growth medium. Hexose supported greater production of sterol than did pentose, and organic nitrogen was superior to inorganic nitrogen in respect to this synthesis. The combination of hexose and organic nitrogen supported the greatest synthesis of sterol.
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45
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GIVNER ML, DVORNIK D. Agents affecting lipid metabolism—XV. Biochemical studies with the cholesterol biosynthesis inhibitor AY-9944 in young and mature rats. Biochem Pharmacol 1965; 14:611-9. [PMID: 14322980 DOI: 10.1016/0006-2952(65)90233-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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46
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47
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Schreiber K, Aurich O. Über die Anwendbarkeit der Liebermann-Burchard-Reaktion auf stickstoffhaltige SteroideSolanum-Alkaloide. XXXVIII. Mitteilung. ACTA ACUST UNITED AC 1964. [DOI: 10.1007/bf02095795] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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48
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TAMURA T, WAINAI T, TRUSCOTT B, IDLER DR. ISOLATION OF 22-DEHYDROCHOLESTEROL FROM SCALLOP. ACTA ACUST UNITED AC 1964; 42:1331-7. [PMID: 14217240 DOI: 10.1139/o64-143] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
22-Dehydrocholesterol has been isolated from the sterols of the scallop Placopecten magellanicus (Gmelin). The azoyl esters of the unsaponifiable fats were separated into four zones by chromatography. The Δ22-sterol accounted for 31.3% of the chromatographic γ-zone and 14.1% of the total sterol fraction. The homogeneity and structure of the isolated sterol were established by gas chromatography. Further confirmation of its identity was afforded by comparison of its physical properties with synthetic 22-dehydrocholesterol and with 22-dehydrocholesterol isolated from a species of red algae.
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