References: Lecithin
Biochim Biophys Acta. 1993 Jun 12;1168(2):153-7.
Dietary vitamin A modulates lecithin-retinol acyltransferase activity in developing chick intestine.
Goda T, Furuta S, Takase S.
School of Food and Nutritional Sciences, University of Shizuoka, Japan.
Retinol absorbed and generated from beta-carotene requires to be esterified by lecithin-retinol acyltransferase (LRAT) in intestinal absorptive cells. To characterize developmental changes in retinol absorptive capability in intestine, we determined LRAT activity and the amount of its retinol donor, cellular retinol-binding protein, type two (CRBP(II)) in the duodenum of developing chicks. The LRAT activity in duodenal microsomes was very low at 18- and 20-day chick embryo, but exhibited a rapid (15-fold) increase during 48 h around hatching, which occurred in parallel with the abrupt elevation of the content of CRBP(II) in chick duodenum. To examine whether dietary vitamin A affects the developmental change in LRAT activity and CRBP(II) content, 1-day-old chicks were pair-fed vitamin A-depleted or vitamin A-supplemented diet for 14 days. The chicks fed vitamin A-depleted diet showed significantly reduced LRAT activity and CRBP(II) in duodenum as early as 3 days after the start of the vitamin A-depleted diet. Changing the diet from vitamin A-depleted to vitamin A-supplemented diet led to an increase in duodenal LRAT activity within 24 h, while serum retinol concentration remained unchanged. These results suggest that duodenal LRAT activity and CRBP(II) are modulated by dietary vitamin A during the perinatal period.
Laxative online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=8504149&dopt=Abstract lecithin
Eur J Biochem. 1993 May 1;213(3):1009-15.
Evidence for a ternary interaction between alpha-actinin, (meta)vinculin and acidic-phospholipid bilayers.
Niggli V, Gimona M.
Department of Pathology, University of Bern, Switzerland.
The cytoskeletal component vinculin has been demonstrated by hydrophobic photoradiolabelling, to insert into bilayers containing acidic phospholipids and trace amounts of a photoactivatable analogue of lecithin. It is shown in this study that the higher-molecular-mass variant metavinculin and alpha-actinin, also share this property. alpha-Actinin and vinculin were also shown to associate with phosphatidylserine liposomes by chromatography of protein/lipid mixtures on a Bio-Gel A-5m column. Furthermore, interesting differences in the behaviour of binary mixtures of these proteins, in the presence of phosphatidylserine liposomes, are shown. Thus, incubation of alpha-actinin with vinculin or metavinculin, prior to the addition of liposomes, strongly inhibited the photoradiolabelling of alpha-actinin under conditions in which the liposome surface was non-limiting, but enhanced the labelling of vinculin. In contrast, vinculin and metavinculin did not mutually influence their labelling. Using gel-filtration chromatography, it was shown that alpha-actinin still bound to the vinculin-liposome complex, under conditions similar to those used for hydrophobic photolabelling with a non-limiting lipid surface. In the presence of limiting amounts of liposomes, the alpha-actinin/vinculin ratio was markedly decreased in the liposome fractions. Our results suggest the formation of a ternary complex consisting of vinculin, alpha-actinin and phospholipids. In this complex, both proteins interact at the bilayer, resulting in an altered conformation of the two proteins and, as a consequence, in modified bilayer interactions.
Laxative online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=8504798&dopt=Abstract lecithin
J Hosp Infect. 2003 Oct;55(2):137-40.
Efficacy of some neutralizers in suspension tests determining the activity of disinfectants.
Espigares E, Bueno A, Fernandez-Crehuet M, Espigares M.
Department of Preventive Medicine and Public Health, University of Granada, Avda Madrid, 11, 18012, Granada, Spain.
The ability of six mixtures to neutralize glutaraldehyde, o-phthalaldehyde and peracetic acid was tested using four reference strains: Pseudomonas aeruginosa CIP A22, Escherichia coli CIP 54127, Staphylococcus aureus CIP 53154, and Enterococcus faecium CIP 5855. Glutaraldehyde was the hardest to neutralize, and peracetic acid the easiest. The most effective mixture was Tween 80 with sodium bisulphate, sodium thioglycolate, lecithin and cysteine, and the least effective was Tween 80, lecithin and histidine. The efficacy of the neutralizers may indicate a propensity loss of activity from interfering substances when disinfectants are used in practice.
Laxative online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=14529639&dopt=Abstract lecithin
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