Membrane is a semiperiable tissue. Now days, the Research membrane filtration process is mostly done, but the Journal article Jurnal Biofisika • Jurnal Biofisika Vol 8, No 1 (): Jurnal Biofisika. SIFAT LISTRIK MEMBRAN SELULOSA ASETAT – TITANIUM DIOKSIDA. Juansah, Jajang. Chemistry: A European Journal, (accepted article, in press). . Membrane insertion of the BAX core, but not latch domain, drives apoptotic pore formation.

Author: Salabar Samurn
Country: Seychelles
Language: English (Spanish)
Genre: History
Published (Last): 26 June 2017
Pages: 395
PDF File Size: 3.2 Mb
ePub File Size: 1.23 Mb
ISBN: 487-3-71585-242-5
Downloads: 28112
Price: Free* [*Free Regsitration Required]
Uploader: Mezik

Note that the amount of Cer in overnight-treated cells will be higher than that present after the treatments described in Fig. SMase activity is found in our cells under conditions causing echinocytosis Fig. Ceramide-induced lamellar gel phases in fluid cell lipid extracts. Williamson P, et al.

The process follows a sequence of events, starting with calcium entry, followed by potassium release, morphological change, generation of ceramide, lipid flip-flop and finally cell lysis. A role of flip-flop inducing lipids, such as long-chain ceramides 1718 msmbran, has also been considered for the PS exposure mechanism.

This article has been cited by other articles in PMC. To view a copy of this license, visit http: In this work we provide insights about the lead-induced eryptotic mechanism. Garcia-Arribas contributed equally to this work. All other reagents and solvents for assay were of analytical reagent grade and were purchased from Sigma-Aldrich.

Pb(II) Induces Scramblase Activation and Ceramide-Domain Generation in Red Blood Cells

Electronic supplementary material Supplementary Figures 2. These facts point to three major checkpoints in the process: AFM morphological changes could be confirmed for a large population of cells using flow cytometric measurements of RBC shape Andree H, et al. Frasch SC, et al. The involvement of a scramblase activity in PS translocation was demonstrated by transfection of a scramblase gene into Chinese hamster ovary CHO cells.


Clinical hemorheology and microcirculation. Cells treated with the neutral SMase inhibitor GW showed much decreased ceramide contents. Immunolabeling reveals the generation of ceramide-enriched domains linked to a cell morphological change, while the use of a neutral sphingomyelinase inhibitor greatly delays the process after the morphological change, and lipid flip-flop is significantly reduced.

In particular, PS translocation from the inner to the outer leaflet of the plasma membrane is critical for recognition and clearance of apoptotic cells by macrophages 52 The Journal of biological chemistry. The Journal of Immunology. Cholesterol could have a role in modulating the properties of the ceramide-enriched domains. The results in Fig.

Binding of vascular anticoagulant alpha VAC alpha to planar phospholipid bilayers. In addition, partial non-cytotoxic cholesterol depletion of red blood cells accelerates the process as the morphological change occurs faster. Shape transitions and lattice structuring of ceramide-enriched domains generated by sphingomyelinase in lipid monolayers.


Each biological replicate was read in 2 technical replicates TR. The process was repeated two more times to increase efficiency. Inhibition of the neutral magnesium-dependent sphingomyelinase by glutathione. Posada IM, et al. The aliquot was deacylated to eliminate phospholipids by methylamine treatment Clarke method.


Data obtained as detailed under Methods. Moreover, data from this and other laboratories suggest that a direct cholesterol-ceramide interaction may be taking place at high concentrations of both lipids 27 Mechanisms of phosphatidylserine exposure, a phagocyte recognition signal, on apoptotic T lymphocytes.

Another possibility is that hypothetical complex gel-like phases enriched in both ceramide and cholesterol become more Cer-enriched, as their properties are modulated by Cer: However, recent reports indicate that scramblase 1 could also interact with cholesterol 74and the possibility of cholesterol depletion enhancing scramblase activity cannot be discarded.

Cell death and differentiation. This suggests that SMase activity and ceramide formation are directly related to cell lysis. This can be due to the lack of three-dimensional imaging in these samples. This would be in agreement with the results observed in RBC lipid extract experiments 29as RBC lipid extracts in the presence of Cer show Cer-enriched domains which, after Chol depletion, stiffen significantly. Cellular physiology and biochemistry: Piagnerelli M, et al.

Jurnal Biofisika

Abstract The mechanisms of Pb II toxicity have been studied in human red blood cells using confocal microscopy, immunolabeling, fluorescence-activated cell sorting and atomic force microscopy. Dreher KL, et al. Cholesterol-rich fluid membranes solubilize ceramide domains: Fluorescence-activated cell sorting analysis Fluorescence-activated cell sorting FACS analysis was performed as described previously Journal of leukocyte biology.