The cytolethal distending toxin of Haemophilus ducreyi aggravates dermal lesions in a rabbit model of chancroid
| Autor: | Lena Mölne, Karin Ahlman, Ing-Marie Jonsson, Teresa Lagergård, Catharina Wising |
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| Rok vydání: | 2004 |
| Předmět: |
Sexually transmitted disease
Haemophilus Infections Cytolethal distending toxin Immunology Bacterial Toxins Inflammation urologic and male genital diseases medicine.disease_cause Microbiology Haemophilus influenzae Lesion Chancroid Haemophilus ducreyi medicine Animals Skin integumentary system biology Pasteurellaceae bacterial infections and mycoses medicine.disease biology.organism_classification female genital diseases and pregnancy complications Infectious Diseases Rabbits medicine.symptom |
| Zdroj: | Microbes and infection. 7(5-6) |
| ISSN: | 1286-4579 |
| Popis: | Haemophilus ducreyi, the etiologic agent of the sexually transmitted disease chancroid, produces a cytolethal distending toxin (HdCDT) that inhibits cultured cell proliferation, leading to cell death. A rabbit model of dermal infection was used to investigate the roles of H. ducreyi bacteria and HdCDT in the development, clinical appearance, and persistence of infection. A non-toxin producing H. ducreyi strain, and for comparison purposes a non-capsulated Haemophilus influenzae strain, were inoculated intradermally, with and without co-administration of purified HdCDT. Co-administration of HdCDT resulted in significant aggravation of H. ducreyi-induced inflammatory lesions, and development of ulcers in rabbit skin. Less pronounced inflammatory lesions and lack of epithelial eruption were observed after inoculation with H. influenzae. Histopathological sections of the H. ducreyi-induced lesions, in both the presence and absence of HdCDT, showed dense infiltrates of the same type inflammatory cells, with the exception of a prominent endothelial cell proliferation noted in sections from lesions caused by H. ducreyi and toxin. Signs of chronic inflammation with involvement of T cells, macrophages, eosinophils, and granuloma formation were observed after H. ducreyi inoculation both with and without toxin. In conclusion, H. ducreyi causes a pronounced, chronic inflammation with involvement of T cells and macrophages, and in combination with HdCDT production of ulcers in the rabbit model. These pathogenic mechanisms may promote the development and persistence of chancroid ulcers. |
| Databáze: | OpenAIRE |
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