Section 10
Chapter 9,257

Proinflammatory cytokine production by human peripheral blood mononuclear cells stimulated with cell-free supernatants of Viridans streptococci

Soto, A.; Evans, T.J.; Cohen, J.

Cytokine 8(4): 300-304


ISSN/ISBN: 1043-4666
PMID: 9162219
DOI: 10.1006/cyto.1996.0040
Accession: 009256295

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Viridans streptococci (VS) have become recognized as an increasingly important cause of bacteraemia in neutropenic patients undergoing chemotherapy. Surprisingly, VS bacteraemia is associated with toxic shock-like syndrome (TSLS) and adult respiratory distress syndrome (ARDS), features not seen in non-neutropenic patients with viridans streptococcal bacteraemia. The mechanism by which these Gram-positive bacteria cause hypo-tension in the absence of endotoxin is not known. In this study, we have analysed the ability of cell-free bacterial supernatants derived from VS to induce the production of a number of cytokines from human peripheral blood mononuclear cells (PBMC). These cytokines were tumour necrosis factor alpha (TNF-alpha), tumour necrosis factor beta (TNF-beta) and interleukin 8 (IL-8). All 59 strains were able to induce these proinflammatory cytokines. We conclude that VS do produce secreted products which are able to stimulate the production of cytokines which may be important in the pathogenesis of shock caused by these bacteria.

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