1887

Abstract

SUMMARY

Whole bacterial cells of as well as purified staphylococcal peptidoglycan (PG) have been demonstrated to stimulate human monocytes to release cytokines. Hypothesising that the phenomenon of changes induced by β-lactam antibiotics in cell-wall composition may alter the immunological properties of the intact cell wall as well as of purified cell-wall components, this study assessed whether cytokine release by human monocytes is altered if cells from strains grown in the presence or absence of sub-minimal inhibitory concentrations of oxacillin are used as stimuli. Whole bacterial cells and isolated PG from these strains, grown in the presence of oxacillin, showed a significantly reduced stimulation of tumour necrosis factor-α, interleukin (IL)-1β and IL-6 release by human monocytes in a concentration-dependent fashion. The serum-induced potentiation of cytokine production by human monocytes in response to PG with modified cross-linking was also reduced. These observations may have particular relevance for staphylococcal infections, in which clinically achievable β-lactam concentrations do not suppress staphylococcal growth yet may alter and possibly enhance virulence.

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1998-06-01
2024-11-05
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