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Research Article

Cytokine response by human monocytes to Clostridium difficile toxin A and toxin B.

W A Flegel, F Müller, W Däubener, H G Fischer, U Hadding, H Northoff
W A Flegel
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F Müller
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W Däubener
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H G Fischer
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U Hadding
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H Northoff
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ABSTRACT

Clostridium difficile toxins A and B isolated from strain VPI 10463 were tested for induction of cytokine release by human monocytes. Toxin B at 10(-12) M activated human monocytes as measured by release of interleukin-1 (IL-1), tumor necrosis factor (TNF), or IL-6. These effects of toxin B were heat labile (51 degrees C, 30 min). Toxin B was as effective as bacterial lipopolysaccharides in inducing IL-1 beta but less effective in inducing TNF or IL-6. Toxin B and lipopolysaccharides were synergistic in induction of IL-1 beta, TNF, and IL-6. The toxin A preparation used was 1,000-fold less active than toxin B. Apart from the difference in activity, the two toxins showed identical patterns of reaction and there was no synergism between them. A short pulse with toxin B was sufficient to trigger IL-1 release. Toxin B was also extremely toxic for monocytes. The toxicity and the induced proinflammatory monokines (IL-1 and TNF) may contribute to the pathogenic mechanisms of C. difficile infection and pseudomembranous colitis.

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Cytokine response by human monocytes to Clostridium difficile toxin A and toxin B.
W A Flegel, F Müller, W Däubener, H G Fischer, U Hadding, H Northoff
Infection and Immunity Oct 1991, 59 (10) 3659-3666; DOI:

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Cytokine response by human monocytes to Clostridium difficile toxin A and toxin B.
W A Flegel, F Müller, W Däubener, H G Fischer, U Hadding, H Northoff
Infection and Immunity Oct 1991, 59 (10) 3659-3666; DOI:
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