1887

Abstract

has been shown to induce apoptosis within macrophages, monocytic cell lines and alveolar epithelial cells. The mechanisms and significance of -associated apoptosis are not well understood. It has been speculated that may induce apoptosis through ligation of death receptors by bacterial surface components or by secreted bacterial factors. Translocation of apoptotic factor(s) through the Dot/Icm secretion machinery followed by direct activation of caspases within the cytosol is discussed as another possible mechanism of apoptosis induction by . Here, it is shown that induced the mitochondrial release of cytochrome in CD95 (Fas/Apo-1)-negative monocytic Mono Mac 6 cells, indicating that -induced apoptosis is mediated via the mitochondrial signalling pathway. In addition, blocking of the death receptor pathway at distinct stages using CD95-, FADD- or caspase-8-deficient Jurkat cells did not affect induction of apoptosis by . Conversely, inhibition of the mitochondrial death pathway by overexpression of the anti-apoptotic protein Bcl-2 potently inhibited the processing of caspases and the induction of apoptosis. Therefore, these findings support a model in which the induction of apoptosis by is mediated by activation of the intrinsic mitochondrial death pathway in the absence of external death receptor signalling.

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2002-11-01
2020-01-24
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