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Molecular Pathogenesis

Implication of the Structure of the Helicobacter pylori cag Pathogenicity Island in Induction of Interleukin-8 Secretion

C. Audibert, C. Burucoa, B. Janvier, J. L. Fauchère
C. Audibert
Laboratoire de Microbiologie A, CHU La Milétrie, 86021 Poitiers Cedex, France
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C. Burucoa
Laboratoire de Microbiologie A, CHU La Milétrie, 86021 Poitiers Cedex, France
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B. Janvier
Laboratoire de Microbiologie A, CHU La Milétrie, 86021 Poitiers Cedex, France
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J. L. Fauchère
Laboratoire de Microbiologie A, CHU La Milétrie, 86021 Poitiers Cedex, France
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DOI: 10.1128/IAI.69.3.1625-1629.2001
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ABSTRACT

Helicobacter pylori virulence is associated with the presence of the cag pathogenicity island (PAI). Thecag PAI is involved in the ability to induce interleukin-8 (IL-8) secretion by human cells, which is implicated in the inflammatory response of the gastric mucosa to H. pyloriinfection. The aim of this study was to determine whether the genetic structure of the cag PAI is conserved and whether it is linked to IL-8 induction ability. Detection of specific markers (cagA, picB, cag13-cag14, virD4, and IS605) by PCR and dot blot hybridization and long-distance PCR determination of the presence of cagI, cagII, and the middle region of thecag PAI were performed on 153 strains isolated from adults suffering from ulcers (n = 79) or gastritis (n = 74). IL-8 induction ability was evaluated by coculture of the strains with HEp-2 cells. Eighty-three strains (54.3%) had an entire cag PAI, 12 strains (7.8%) had thecag PAI split in two, 49 strains (32%) had nocag PAI, and 9 strains exhibited other structural combinations. The presence of an entire cag PAI was statistically correlated with the presence of IS605(P = 0.006) and the ability to induce IL-8 secretion but not with clinical presentation of the infection. The structure of the cag PAI appears to be rather conserved and is related to the proinflammatory power of a strain. The existence of strains inducing IL-8 secretion regardless of the cag PAI structure suggests that this region is not the only requirement for IL-8 secretion.

  • Copyright © 2001 American Society for Microbiology
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Implication of the Structure of the Helicobacter pylori cag Pathogenicity Island in Induction of Interleukin-8 Secretion
C. Audibert, C. Burucoa, B. Janvier, J. L. Fauchère
Infection and Immunity Mar 2001, 69 (3) 1625-1629; DOI: 10.1128/IAI.69.3.1625-1629.2001

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Implication of the Structure of the Helicobacter pylori cag Pathogenicity Island in Induction of Interleukin-8 Secretion
C. Audibert, C. Burucoa, B. Janvier, J. L. Fauchère
Infection and Immunity Mar 2001, 69 (3) 1625-1629; DOI: 10.1128/IAI.69.3.1625-1629.2001
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KEYWORDS

Antigens, Bacterial
Bacterial Proteins
Helicobacter Infections
Helicobacter pylori
Interleukin-8
virulence factors

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