A diffusible cytotoxin of Haemophilus ducreyi

Leslie D. Cope, Sheryl Lumbley, Jo L. Latimer, Julia Klesney-Tait, Marla K. Stevens, Linda S. Johnson, Maria Purven, Robert S. Munson, Teresa Lagergard, Justin D. Radolf, Eric J. Hansen

Research output: Contribution to journalArticle

181 Citations (Scopus)

Abstract

Little is known about the virulence mechanisms employed by Haemophilus ducreyi in the production of genital ulcers. This Gram-negative bacterium previously has been shown to produce a soluble cytotoxic activity that kills HeLa and HEp-2 cells. We have now identified a cluster of three H. ducreyi genes that encode this cytotoxic activity. The predicted proteins encoded by these genes are most similar to the products of the Escherichia coli cdtABC genes that comprise the cytolethal distending toxin (CDT) of this enteric pathogen. Eleven of 12 H. ducreyi strains were shown to possess this gene cluster and culture supernatants from these strains readily killed HeLa cells. The culture supernatant from a single strain of H. ducreyi that lacked these genes was unable to kill HeLa cells. When the H. ducreyi cdtABC gene cluster was cloned into E. coli, culture supernatant from the recombinant E. coli clone killed HeLa cells. A monoclonal antibody that neutralized this soluble cytotoxic activity of H. ducreyi was shown to bind to the H. ducreyi cdtC gene product. This soluble H. ducreyi cytotoxin may play a role in the development or persistence of the ulcerative lesions characteristic of chancroid.

Original languageEnglish (US)
Pages (from-to)4056-4061
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume94
Issue number8
DOIs
StatePublished - Apr 15 1997

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Haemophilus ducreyi
Cytotoxins
HeLa Cells
Multigene Family
Escherichia coli
Genes
Chancroid
Gram-Negative Bacteria
Ulcer
Virulence
Clone Cells
Monoclonal Antibodies

Keywords

  • bacterial pathogenesis
  • chancroid
  • virulence factor

ASJC Scopus subject areas

  • Genetics
  • General

Cite this

Cope, L. D., Lumbley, S., Latimer, J. L., Klesney-Tait, J., Stevens, M. K., Johnson, L. S., ... Hansen, E. J. (1997). A diffusible cytotoxin of Haemophilus ducreyi. Proceedings of the National Academy of Sciences of the United States of America, 94(8), 4056-4061. https://doi.org/10.1073/pnas.94.8.4056

A diffusible cytotoxin of Haemophilus ducreyi. / Cope, Leslie D.; Lumbley, Sheryl; Latimer, Jo L.; Klesney-Tait, Julia; Stevens, Marla K.; Johnson, Linda S.; Purven, Maria; Munson, Robert S.; Lagergard, Teresa; Radolf, Justin D.; Hansen, Eric J.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 94, No. 8, 15.04.1997, p. 4056-4061.

Research output: Contribution to journalArticle

Cope, LD, Lumbley, S, Latimer, JL, Klesney-Tait, J, Stevens, MK, Johnson, LS, Purven, M, Munson, RS, Lagergard, T, Radolf, JD & Hansen, EJ 1997, 'A diffusible cytotoxin of Haemophilus ducreyi', Proceedings of the National Academy of Sciences of the United States of America, vol. 94, no. 8, pp. 4056-4061. https://doi.org/10.1073/pnas.94.8.4056
Cope LD, Lumbley S, Latimer JL, Klesney-Tait J, Stevens MK, Johnson LS et al. A diffusible cytotoxin of Haemophilus ducreyi. Proceedings of the National Academy of Sciences of the United States of America. 1997 Apr 15;94(8):4056-4061. https://doi.org/10.1073/pnas.94.8.4056
Cope, Leslie D. ; Lumbley, Sheryl ; Latimer, Jo L. ; Klesney-Tait, Julia ; Stevens, Marla K. ; Johnson, Linda S. ; Purven, Maria ; Munson, Robert S. ; Lagergard, Teresa ; Radolf, Justin D. ; Hansen, Eric J. / A diffusible cytotoxin of Haemophilus ducreyi. In: Proceedings of the National Academy of Sciences of the United States of America. 1997 ; Vol. 94, No. 8. pp. 4056-4061.
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