Abstract
In a previous study, Staphylococcus aureus purified cell walls (PCW), consisting of peptidoglycan (PG) plus covalently linked teichoic acid (TA), were found to be more active in complement consumption than isolated PG. Isolated TA has now been shown to be capable of activating complement. Mild sonication markedly increased the ability of PG to activate complement but had essentially no effect on the activities of PCW and TA. Optimal sonication of PG did not yield activities equal to those of PCW in dose-response and kinetic studies, which may imply that TA plays some role in complement consumption. Sonication did not lead to solubilization of PCW or PG but may have enhanced the activity of PG in complement consumption by better dispersing PG particles, thereby exposing more surface area. Lysostaphin solubilization of PCW and PG markedly decreased their activities in complement consumption. The PCW of an S. aureus TA-deficient mutant, which were mostly PG, caused similar amounts of complement consumption as the parent strain PCW. Of the treatments of PCW commonly used to isolate PG, formamide and periodate extractions in particular led to PG preparations with lower activities in complement consumption than the PCW from which they were prepared, although these activities were stimulated by sonication. When whole organisms were studied by using a TA-deficient mutant, a mutant with an additional cell surface polymer, and the TA-containing parent strains and complement consumption by these strains was compared, no difference was found in either the rate or the degree of complement activation. This led to experiments demonstrating that both material released extracellularly from staphylococci and the cytoplasmic fraction of S. aureus were active in complement consumption. The results of these experiments indicate that both physical and chemical factors must be considered in studies of complement activation by isolated bacterial cell wall components. Under certain conditions, staphylococcal TA may enhance complement activation, but studies with whole organisms clearly show that this cell wall constituent does not play an essential role in this process. In addition, studies of complement consumption with intact organisms have demonstrated that there may be contributions both from cell surface components and from material released by the cells.
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Selected References
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