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001-es BibID:KLTEbibl004590
Első szerző:Joó Ferenc (vegyész)
Cím:The activation of rat platelets increases the exposure of polyunsaturated fatty acid enriched phospholipids on the external leaflet of the plasma membrane / Ferenc Joó, Francoise Chevy, Odile Colard, Claude Wolf
Dátum:1993
ISSN:0005-2736
Megjegyzések:Rat platelets have been hydrogenated in the presence of colloidal palladium adsorbed on the surface of the non water-soluble polymer polyvinylpolypyrrolidone. This non-permeating catalyst restricts hydrogenation of the fatty acyl double bonds of phospholipids only in the outer half of the plasma membrane. The pattern of hydrogenation of the molecular species present on the external side of the membrane is determined using desorption-chemical soft ionization-mass spectrometry (DCI-MS) before and after cell activation by the calcium ionophore A23187. The accessibility to the catalyst of the polyunsatured molecular species within each phospholipid class is compared for resting and activated cells. The abundance of polyunsaturated species of phosphatidyl-ethanolamine and -serine in the inner half of the resting biomembrane is confirmed in rat platelets. Phosphatidylcholine is especially rich in disaturated species in this membrane. The induced exposure of the polyunsaturated species of diacyl- and ether-phosphatidylethanolamine, and of phosphatidylserine on the external side of the membrane appears after activation by the calcium ionophore. A detailed quantitative analysis within a phospholipid class shows an unequal scrambling for diacylalkyl-, alkenyl-phosphatidylethanolamine, and a variable involvement in the transmembrane redistribution following cell activation of the various molecular species as a function of the acyl moities.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Platelet activation
Polyunsaturated fatty acid
Phospholipid
Plasma membrane
Hydrogenation
Megjelenés:Biochimica et Biophysica Acta (BBA). Biomembranes. - 1149 : 2 (1993), p. 231-240. -
További szerzők:Chevy, Francoise Colard, Odile Wolf, Claude
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:bibEBI00008599
Első szerző:Logue, James A.
Cím:Catalytic hydrogenation of polyunsaturated biological membranes : effects on membrane fatty acid composition and physical properties / James A. Logue, László Vígh, Ferenc Joó, Andrew R. Cossins
Dátum:1998
ISSN:0005-2736
Megjegyzések:The relationship between phospholipid saturation and membrane physical structure in a complex, highly polyunsaturated biological membrane (trout liver microsomes) has been studied by the graded and specific hydrogenation of polyunsaturated fatty acids. The homogeneous catalyst Pd(QS)2 caused rapid and effective hydrogenation, increasing the proportion of saturated fatty acids from 20-30% up to 60%, without loss or fragmentation. Long chain, polyunsaturated fatty acids (20:5?3, 22:6?3) were rapidly converted to a large number of partially hydrogenated isomers, and ultimately to the fully saturated C20 or C22 fatty acids. C18 mono- and di-unsaturates showed slower rates of hydrogenation. Increased saturation was closely associated with an increased membrane physical order as determined by the fluorescence anisotropy probe, 1,6-diphenyl-1,3,5-hexatriene. However, extensive hydrogenation led to highly ordered membranes exhibiting a gel-liquid crystalline phase transition between 30 and 60°C. Polyunsaturated membranes can thus be converted into partially or substantially saturated membranes with measurable phase structure without direct alteration of other membrane components. This offers a less equivocal means of assessing the influence of polyunsaturation upon membrane structure and function.
Tárgyszavak:idegen nyelvű folyóiratközlemény külföldi lapban
Catalytic hydrogenation
Lipid hydrogenation
Membrane fluidity
Fatty acid saturation
Polyunsaturated fatty acid
Fish membrane
Megjelenés:Biochimica et Biophysica Acta (BBA). Biomembranes. - 1368 : 1 (1998), p. 41-51. -
További szerzők:Vígh László Joó Ferenc (1949-) (vegyész) Cossins, Andrew R.
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
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