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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1992 Jul 15;89(14):6521–6525. doi: 10.1073/pnas.89.14.6521

Modulation of adenylate cyclase toxin production as Bordetella pertussis enters human macrophages.

H R Masure 1
PMCID: PMC49533  PMID: 1631152

Abstract

During the course of human infection, Bordetella pertussis colonizes sequential niches in the respiratory tract that include intracellular and extracellular environments. In vitro the expression of virulence factors such as the adenylate cyclase toxin is coordinately regulated by the bvg locus, which is an example of a two-component sensory transduction system. With this toxin as a reporter, enzyme activities were compared between a wild-type and an altered strain to determine whether bacterial entry into human macrophages affected gene expression. BPRU140, a strain containing an inducible expression vector, produced enzyme activity independent of bvg. Samples of the parent, the induced, and the uninduced BPRU140 were incubated individually with macrophages for 30 min. Extracellular bacteria were then killed by gentamicin. The number of viable intracellular bacteria and the internalized bacterial enzyme activity were measured over time. By 2.5 hr all samples reached a steady-state concentration of 10(5) bacteria per 10(6) macrophages. Following an initial peak of enzyme activity, adenylate cyclase values for the parent and the uninduced BPRU140 decreased to a basal level, while the values for the induced strain remained at least 3-fold greater. Therefore, compared with the persistence of enzyme in the induced strain BPRU140, the decrease in enzyme production by the parent and the uninduced BPRU140 upon entry into macrophages indicates in vivo down-modulation of gene expression. These observations support the hypothesis that sensory transduction contributes to adaptations for bacterial survival in the infected host.

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Selected References

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