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Normal rabbit serum reduces the buoyant density of lipopolysaccharide (LPS) from Escherichia coli 0111:B4 (d = 1.44 g/cm3) and Salmonella minnesota R595 (d = 1.38 g/cm3) to a value less than g/cm3. This density shift is associated with the inhibition of a number of endotoxic activities of the LPS; namely, the pyrogenic activity, the ability to produce an immediate neutropenia in rabbits, lethality in adrenalectomized mice, and anticomplementary activity. A qualitatively similar change in buoyant density was observed to occur after intravenous injection of the LPS into rabbits. Preliminary evidence suggests that the density shift does not occur as a result of the degradation of the glycolipid backbone of the LPS. These data suggest that the interactions of LPS with plasma (or serum) components leading to reduction in buoyant density may account for a major pathway of LPS detoxification.

The modification of biophysical and endotoxic properties of bacterial lipopolysaccharides by serum.