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- W2088906085 abstract "The role of the spectrin-based membrane skeleton in cell fusion was studied by following the condition-dependent diameter versus time expansion signature of the fusion zone in electrofused pairs of erythrocyte ghost membranes. Previous work showed that the presence of the dielectrophoresis-inducing alternating electric field, which is used to bring membranes into contact through pearl chain formation, had a detectable promoting effect on fusion zone expansion. Two new dielectrophoresis protocols were used in the present work to utilize this externally generated and controllable microforce field to probe the forces intrinsic to the system that drives the expansion of the fusion zone. First, fusion zones expanded to a greater diameter in a strong AC field compared to a weak AC field, and they expanded to a greater diameter if erythrocyte ghosts received a prior heat treatment (42 degrees C, 20 min). Furthermore, flat diaphragm fusion zones broke down into open lumen fusion zones sooner (i.e., had shorter lifetimes) when they were expanding more quickly. Second, changing the AC field strength at specific times during the fusion zone expansion led to an immediate visco-elastic response. However, shifting the AC field strength to zero after 5 s of fusion zone expansion resulted in a subsequent decrease in the average fusion zone diameter. This suggests not only that the spectrin-based membrane skeleton actually tends to prevent the rounding up process but that it may be capable of generating an antirounding force, which has broad implications for the role of the membrane skeleton in cell fusion. These results are consistent with the hypothesis that flat diaphragm fusion zones induced in heat-treated membranes were very easily stretched and that membrane-based forces that control or drive the expansion process must originate from membrane area that is outside rather than inside the fusion zone. Lastly, when an outward-directed osmotic pressure-based microforce was present at the time that erythrocyte ghosts were fused, the fusion zone diameter underwent a greater expansion in the 0-1 s interval after fusion. This suggests that an osmotic pressure-based microforce can be used to experimentally calibrate the dielectrophoretic force." @default.
- W2088906085 created "2016-06-24" @default.
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- W2088906085 date "1995-12-01" @default.
- W2088906085 modified "2023-09-26" @default.
- W2088906085 title "Membrane skeleton restraint of surface shape change during fusion of erythrocyte membranes: evidence from use of osmotic and dielectrophoretic microforces as probes" @default.
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- W2088906085 doi "https://doi.org/10.1016/s0006-3495(95)80121-9" @default.
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