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. 1997 Dec;65(12):5165–5170. doi: 10.1128/iai.65.12.5165-5170.1997

The interleukin 1beta-converting enzyme, caspase 1, is activated during Shigella flexneri-induced apoptosis in human monocyte-derived macrophages.

H Hilbi 1, Y Chen 1, K Thirumalai 1, A Zychlinsky 1
PMCID: PMC175744  PMID: 9393811

Abstract

Shigella, the etiological agent of bacillary dysentery, rapidly kills human monocyte-derived macrophages in vitro. Wild-type Shigella flexneri, but not a nonvirulent derivative, induced human macrophage apoptosis as determined by morphology and terminal deoxynucleotidyltransferase-mediated dUTP-biotin nick end labeling (TUNEL). Shigella-mediated macrophage cell death was blocked by the peptide inhibitors of caspases, acetyl-Tyr-Val-Ala-Asp-aldehyde (acetyl-YVAD-CHO) and acetyl-Tyr-Val-Ala-Asp-chloromethylketone (acetyl-YVAD-CMK). Protection from apoptosis by YVAD was observed in monocytes matured in the presence or absence of colony-stimulating factors (CSF) like macrophage-CSF or granulocyte-macrophage-CSF. Furthermore, lipopolysaccharide (LPS) or gamma interferon (IFN-gamma) rendered human macrophages partially resistant to Shigella cytotoxicity. Macrophages stimulated with either LPS or IFN-gamma were also protected by YVAD from Shigella-induced cell death. During Shigella infections of human macrophages, interleukin-1beta (IL-1beta) was cleaved to the mature form. IL-1beta maturation was severely retarded by YVAD, indicating that IL-1beta-converting enzyme (ICE; caspase 1) is activated in Shigella-induced apoptosis. The finding that Shigella induces apoptosis in human macrophages by activating ICE supports the hypothesis that the acute inflammation characteristic of shigellosis is initially triggered by apoptotic macrophages which release mature IL-1beta during programmed cell death.

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Selected References

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