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. 1978 Nov;75(11):5669–5673. doi: 10.1073/pnas.75.11.5669

Steady-state analysis of tracer exchange across the C5b-9 complement lesion in a biological membrane.

P J Sims, P K Lauf
PMCID: PMC393029  PMID: 281715

Abstract

Resealed erythrocyte ghosts have been used to define the kinetics of tracer exchange across the membrane-bound terminal complex of the complement cascade (C5b-9). Under steady-state conditions and at net chemical equilibrium, C5b-9 ghosts showed no significant lysis above control levels as measured by hemoglobin efflux. In 1 mM sucrose at 37 degrees C, [14C]sucrose isotopic exchange diffusion into C5b-9 ghosts occurred at 4.8 (+/- 0.5, SEM) X 10(-20) mol sec-1 per functional lesion, equivalent to an apparent permeability coefficient of 4.8 X 10(-14) cm3 sec-1 for the single C5b-9 lesion. No significant uptake of [14C]sucrose above control levels was observed in C5b67 ghosts. The apparent rate of tracer permeation through the complement lesion is one to two orders of magnitude slower than predicted by a model of a transmembrane channel of dimensions permitting free diffusion of sucrose. The data support earlier assertions from this laboratory that diffusion of small molecules across the complement lesion in biological membranes is significantly restricted.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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