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- W2078193150 abstract "The effect of the negatively charged ganglioside GD1a, one of the major brain gangliosides [H. Beitinger, W. Probst, R. Hilbig, H. Rahmann, Seasonal variability of sialo-glycoconjugates in the brain of the Djungarian hamster (Phodopus sungorus). Comp. Biochem. Physiol., B 86 (1987) 377-384] on the function of brain derived BTX-modified voltage-dependent sodium channel was studied using the planar lipid bilayer system. Bilayers were formed either with a mixture of neutral phospholipids (4 phosphoethanolamine (PE):1 phosphocholine (PC)) alone or with one containing 6% of the disialoganglioside GD1a. The permeation and activation properties of the channels were measured in the presence of symmetrical 200 mM NaCl. We found that the single channel conductance was not affected by GD1a, whereas the steady-state activation curve displayed a hyperpolarizing shift in the presence of GD1a. Since the lipid distribution in these membranes is symmetrical, then the GD1a effect on sodium channels may result either from an induction of channel conformational changes or from an asymmetrical interaction between the channel (extracellular vs. intracellular channel aspect) and GD1a. Regardless of the mechanism, the data indicate that differences in ganglioside content in neuronal cells may contribute to the previously observed sodium channel functional variability within (soma, dentritic, axon hillock) and between neuronal cells as well as to excitability changes in those physiological and pathological conditions where changes in the neuronal ganglioside content occur." @default.
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- W2078193150 date "2004-09-01" @default.
- W2078193150 modified "2023-10-12" @default.
- W2078193150 title "Ganglioside GD1a increases the excitability of voltage-dependent sodium channels" @default.
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- W2078193150 doi "https://doi.org/10.1016/j.brainres.2004.06.055" @default.
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