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Phenomenon of apoptosis in the survival of enterobacteria in the parasite-host system



Phenomenon of apoptosis in the survival of enterobacteria in the parasite-host system



Zhurnal Mikrobiologii Epidemiologii i Immunobiologii 2002(1): 79-84



Data on the apoptosis phenomenon with enterobacteria used as a model are presented. One of the mechanisms regulating the vital activity of eukaryotic cells is, together with cell proliferation and differentiation, the phenomenon known as "apoptosis". This physiological process of the eukaryotic cells death is used by many parasites in parasite--host relationships in different epitopes. The system known to trigger programmed cell death, is the surface receptor Fas, the receptor of tumor necrosis factor (TNF alpha) activated by the corresponding FasL ligand and TNF alpha, which further triggers the cascade mechanisms of the execution program. In various representatives of enterobateria different proteins serve as Fas ligand, viz. protein IpaB in Shigella flexneri, SipB activating converting enzyme IL-1 beta, identical to capsase-1, in Salmonella spp., YopP in Yersinia spp. Still the mechanism triggering apoptosis in Yersinia spp. has some original features. In Escherichia coli alpha-hemolysin is the factor triggering the suicidal program, the triggering mechanism being mediated by an increase in intracellular calcium ions.

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Accession: 046973582

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PMID: 11949266


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