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  • 1975-1979  (3)
  • 1970-1974  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    SULPHOLIPID METABOLISM IN DEVELOPING CHICKEN RETINA (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 30 (1978), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Glycolipid analysis of chicken retina and brain indicated the presence of cerebroside, cerebroside 3-sulphate and sulphogalactosylglycerolipid In retina, the ratio of cerebroside to cerebroside 3-sulphate was approximately half compared to brain. During chicken retina ontogenesis the ratio of cerebroside 3-sulphate to sulphogalactosylglycerolipid increased rapidly and in the adult animal, the amount of cerebroside 3-sulphate was 14 times higher than that of sulphogalactosylglycerolipid.The activity of PAPS: cerebroside sulphotransferase and arylsulphatase A in developing chicken retina indicated that the general ontogenic profiles of retinal PAPS: cerebroside sulphotransferase and arylsulphatase A were similar to those obtained for the brain. Both the enzymes showed the highest activity just before hatching. The significance of occurrence of sulpholipids in retina is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1978.tb07048.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    EFFECT OF LIGHT ON GANGLIOSIDES FROM CALF RETINA AND PHOTORECEPTORS (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 22 (1974), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: —The gangliosides of the whole calf retina and the rod outer segments have been analysed. This has been done in two functional states: before and after stimulation by light. After exposure to light no statistically significant change in the gangliosides of the whole retina was observed, but a 40 per cent increase in concentration was found in the rod outer segments. This difference was apparent only when using the same batch of rod outer segments. The major ganglioside in the whole calf retina is GD3 which accounts for 46 per cent of the total. Three other gangliosides GD1a, GD1b and GT1 are quantitatively important, each being between 12 and 16 per cent. GQ1, GM1, and GM3 are minor constituents. In contrast to the chicken retina, GM2 was not detected. The ganglioside N-acetylneuraminic acid of the rod outer segments accounts for only 1 per cent of the gangliosides of the whole retina. The composition of the gangliosides in the rod outer segments is essentially the same as that of the whole retina. No difference in the relative proportion of the gangliosides of either the rod outer segments or the whole retina was observed after exposure to light.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1974.tb04339.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    PHOSPHOLIPID METABOLISM IN LIGHT AND DARK ADAPTED EXCISED RETINA (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 20 (1973), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract— The phospholipid composition of, and the incorporation of labelled phosphorus into the different phospholipids of rat and calf retina have been studied. The influence of various conditions, such as dark and light adaptation, during the preparation of retina, lipid extraction and incubation of retina with radioactive phosphorus was investigated.The phospholipid composition of rat retina did not differ significantly from that of calf retina and the different conditions of preparation and incubation did not modify the distributions.The specific radioactivities of the different phospholipids of calf and rat retina, incubated in the presence of 32P, distinguished in both species two groups of components characterized by the rate of labelling. Phosphatidic acid (PA) and inositol glycerophospholipids (PI) belonged to the first group and showed the highest uptake of labelled phosphorus; the second group, comprising choline glycerophospholipids (PC), serine glycerophospholipids (PS), sphingomyelin (SP), ethanolamine glycerophospholipids (PE) and cardiolipin (CL) showed low incorporation activities. Only SP was labelled differently in rat and calf retina. With the exception of PS, there was no evidence for the influence of light on the turnover of individual phospholipids. The finding that PS showed higher specific radioactivities when adaptation and incubation proceeded in the dark, seems to be of interest and needs further study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1973.tb12132.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    ENZYMATIC BIOSYNTHESIS OF ETHANOLAMINE- AND CHOLINE-PHOSPHOGLYCERIDES IN RETINA DURING DEVELOPMENT. EFFECT OF LIGHT STIMULATION (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 31 (1978), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Choline- and ethanolamine-phosphoglycerides (CPG and EPG) are the most abundant phospholipids of retinal membranes. We have investigated some regulatory mechanisms involved in the final steps of their biosynthesis, namely those catalysed by CDP-choline 1,2 diradyl-sn-glycerol choline phosphotransferase (CPT) and CDP-ethanolamine 1,2 diradyl-sn-glycerol ethanolamine phosphotransferase (EPT). We have studied both enzymes in the retina which offers an excellent model for the investigation of the molecular basis of the effect of its physiological stimulus, the light. In chick retina. the specific activity (SA) of EPT reached a maximum at the 18th day of embryonic life and decreased thereafter. In the case of CPT, a similar peak of SA was observed at hatching. The time of maximum SA of EPT and CPT corresponded to the period during which retinal rod outer segments are formed. The apparent Km values of EPT and CPT determined with whole retinal homogenates for CDP-bases showed different profiles. The apparent Km of EPT decreased during embryonic life and increased thereafter whereas the apparent Km of CPT did not change during ontogenesis. Light stimulation of calf retinal homogenates had different effects on phosphotransferase activities. In the presence of only endogenous diacylglycerol (DAG) the SA of CPT was 2-fold higher for dark-adapted retinas, whereas no differences in EPT activities were observed. After addition of exogenous DAG (4mM) to the incubation medium, light stimulation of the retina led to a 50% increase of EPT activity whereas no effect was observed for CPT. These different effects could be related to the cyclic nucleotides present in retina before and after light stimulation. In addition all the data presented in this study indicate that, as in brain, CPT and EPT in retina are two different enzymes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1978.tb06239.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    DEVELOPMENTAL PATTERNS OF GANGLIOSIDES AND OF PHOSPHOLIPIDS IN CHICK RETINA AND BRAIN (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 25 (1975), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract— The changes in phospholipids and gangliosides during ontogenesis of chick retina have been compared with those in brain. Three phases of accumulation of ganglioside NeuNAc in the retina were detected. In contrast, brain NeuNAc rapidly increased during embryonic life until hatching, followed by a slower increase up to the adult stage. The phospholipid changes in retina and in brain occur in a-similar manner to the variations observed for gangliosides, however in retina the changes of phospholipid content are less marked than in brain, during embryonic life. There were marked changes in the retina and brain ganglioside patterns with age. Gd3 and Gd1b decreased rapidly in per cent; correspondingly, Gd1a increased during embryonic life and became the major ganglioside in place of Gd3. There was a similarity between ganglioside patterns of chick retina and brain. Except for some slight variations during embryonic life, the retinal phospholipid pattern did not change noticeably.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1975.tb06960.x
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    Paper (German National Licenses)
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