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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 105, No. 6, 2010, pp. 786-791
Bioline Code: oc10132
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 105, No. 6, 2010, pp. 786-791

 en Expression of bacterial virulence factors and cytokines during in vitro macrophage infection by enteroinvasive Escherichia coli check for this species in other resources and Shigella flexneri check for this species in other resources : a comparative study
Bando, Silvia Y.; Moreno, Ana C.R.; Albuquerque, José A.T.; Amhaz, Juliana M.K.; Moreira-Filho, Carlos A. & Martinez, Marina B.


Enteroinvasive Escherichia coli check for this species in other resources (EIEC) and Shigella check for this species in other resources spp cause bacillary dysentery in humans by invading and multiplying within epithelial cells of the colonic mucosa. Although EIEC and Shigella share many genetic and biochemical similarities, the illness caused by Shigella is more severe. Thus, genomic and structure-function molecular studies on the biological interactions of these invasive enterobacteria with eukaryotic cells have focused on Shigella rather than EIEC. Here we comparatively studied the interactions of EIEC and of Shigella flexneri with cultured J774 macrophage-like cells. We evaluated several phenotypes: (i) bacterial escape from macrophages after phagocytosis, (ii) macrophage death induced by EIEC and S. flexneri, (iii) macrophage cytokine expression in response to infection and (iv) expression of plasmidial (pINV) virulence genes. The results showed that S. flexneri caused macrophage killing earlier and more intensely than EIEC. Both pathogens induced significant macrophage production of TNF, IL-1 and IL-10 after 7 h of infection. Transcription levels of the gene invasion plasmid antigen-C were lower in EIEC than in S. flexneri throughout the course of the infection; this could explain the diminished virulence of EIEC compared to S. flexneri.

EIEC - Shigella - in vitro infection - cytokines - virulence factors

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