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Berlin Brandenburg

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  • Health sciences -- Medical sciences -- Immunology -- Haemophilus ducreyi  (3)
  • Virulence
  • JSTOR Current Journals  (3)
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  • 1
    Language: English
    In: The Journal of infectious diseases, 01 August 2009, Vol.200(3), pp.409-16
    Description: Haemophilus ducreyi 35000HP contains a homologue of the luxS gene, which encodes an enzyme that synthesizes autoinducer 2 (AI-2) in other gram-negative bacteria. H. ducreyi 35000HP produced AI-2 that functioned in a Vibrio harveyi-based reporter system. A H. ducreyi luxS mutant was constructed by insertional inactivation of the luxS gene and lost the ability to produce AI-2. Provision of the H. ducreyi luxS gene in trans partially restored AI-2 production by the mutant. The luxS mutant was compared with its parent for virulence in the human challenge model of experimental chancroid. The pustule-formation rate in 5 volunteers was 93.3% (95% confidence interval, 81.7%-99.9%) at 15 parent sites and 60.0% (95% confidence interval, 48.3%-71.7%) at 15 mutant sites (1-tailed P 〈 .001). Thus, the luxS mutant was partially attenuated for virulence. This is the first report of AI-2 production contributing to the pathogenesis of a genital ulcer disease.
    Keywords: Bacterial Proteins -- Metabolism ; Carbon-Sulfur Lyases -- Metabolism ; Chancroid -- Microbiology ; Haemophilus Ducreyi -- Genetics
    ISSN: 0022-1899
    E-ISSN: 15376613
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  • 2
    Language: English
    In: The Journal of infectious diseases, 01 June 2008, Vol.197(11), pp.1531-6
    Description: Haemophilus ducreyi 35000HP contains a cluster of homologues of genes required for the synthesis of enterobacterial common antigen (ECA), suggesting that H. ducreyi may express a putative ECA-like glycoconjugate. WecA initiates the synthesis of ECA by transferring N-acetylglucosamine to undecaprenyl-P, to form lipid I. A wecA mutant (35000HPwecA) was constructed, and 5 volunteers were inoculated at 3 sites with fixed doses of 35000HP on one arm and at 3 sites with varying doses of 35000HPwecA on the other arm. 35000HPwecA caused pustules to form at 3 sites inoculated with a dose 2.5-fold higher than that of 35000HP. However, at sites inoculated with similar doses of 35000HP and 35000HPwecA, pustules developed at 46.7% (95% confidence interval [CI], 23.3%-70.0%) of 15 parent-strain sites and at 8.3% (95% CI, 0.01%-23.6%) of 12 mutant-strain sites (P = .013). Thus, the expression of wecA contributes to the ability of H. ducreyi to cause pustules in humans.
    Keywords: Multigene Family ; Antigens, Bacterial -- Genetics ; Chancroid -- Microbiology ; Haemophilus Ducreyi -- Genetics
    ISSN: 0022-1899
    E-ISSN: 15376613
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  • 3
    Language: English
    In: The Journal of Infectious Diseases, 1 March 2000, Vol.181(3), pp.1049-1054
    Description: Haemophilus ducreyi expresses a conserved hemoglobin-binding outer-membrane protein (HgbA). To test the role of HgbA in pathogenesis, we infected 9 adults with isolate 35000 and its isogenic hgbA-inactivated mutant (FX504) on their upper arms in a double-blinded, escalating dose-response study. Papules developed at similar rates at sites inoculated with the mutant or parent. The pustule-formation rate was 55% (95% confidence interval [CI], 30.8%-78.5%) at parent sites and 0 (95% CI, 0-10.5%) at mutant sites (P 〈 .0001). The recovery rate of H. ducreyi from surface cultures was 16% (n = 142) from parent sites and 0 (n = 213) from mutant sites (P 〈 .0001). H. ducreyi was recovered at biopsy from 6 of 7 parent sites and from 0 of 3 mutant sites. The results indicate that hemoglobin may be a critical source of heme or iron for the establishment of H. ducreyi infection in humans.
    Keywords: Physical sciences -- Chemistry -- Chemical compounds -- Haemophilus ducreyi ; Biological sciences -- Biology -- Microbiology -- Haemophilus ducreyi ; Biological sciences -- Biology -- Microbiology -- Haemophilus ducreyi ; Health sciences -- Medical conditions -- Infections -- Haemophilus ducreyi ; Physical sciences -- Chemistry -- Chemical compounds -- Haemophilus ducreyi ; Health sciences -- Medical diagnosis -- Diagnostic methods -- Haemophilus ducreyi ; Health sciences -- Medical sciences -- Pharmacology -- Haemophilus ducreyi ; Health sciences -- Medical sciences -- Immunology -- Haemophilus ducreyi ; Health sciences -- Medical conditions -- Physical trauma -- Haemophilus ducreyi ; Health sciences -- Health and wellness -- Public health -- Haemophilus ducreyi
    ISSN: 00221899
    E-ISSN: 15376613
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