Chancroid pathophysiology: Difference between revisions
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===Pathogenesis=== | ===Pathogenesis=== | ||
*''H. ducreyi'' enters the skin through breaks in the epithelium. | *''H. ducreyi'' enters the skin through breaks in the epithelium. | ||
*''H. ducreyi'' produces 3 fimbrialike proteins (Flp), Flp1, Flp2, and Flp3, that help the bacteria adhere to subcutaneous epithelial cells and fibroblasts.<ref name=" | *''H. ducreyi'' produces 3 fimbrialike proteins (Flp), Flp1, Flp2, and Flp3, that help the bacteria adhere to subcutaneous epithelial cells and fibroblasts.<ref name="SpinolaFortney2003">{{cite journal|last1=Spinola|first1=S. M.|last2=Fortney|first2=K. R.|last3=Katz|first3=B. P.|last4=Latimer|first4=J. L.|last5=Mock|first5=J. R.|last6=Vakevainen|first6=M.|last7=Hansen|first7=E. J.|title=Haemophilus ducreyi Requires an Intact flp Gene Cluster for Virulence in Humans|journal=Infection and Immunity|volume=71|issue=12|year=2003|pages=7178–7182|issn=0019-9567|doi=10.1128/IAI.71.12.7178-7182.2003}}</ref><ref name="pmid1391058">{{cite journal| author=Abeck D, Johnson AP| title=Pathophysiological concept of Haemophilus ducreyi infection (chancroid) | journal=Int J STD AIDS | year= 1992 | volume= 3 | issue= 5 | pages= 319-23 | pmid=1391058 | doi= | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=1391058}}</ref> | ||
*''H. ducreyi'' recruits inflammatory cells to the infected area and induces secretion of interleukin 6 (IL-6) and interleukin 8 (IL-8) from epithelial cells. IL-8 induces neutrophils and macrophages to form abscesses, which may cause the presentation of erythematous papules which progress into intradermal pustules.<ref name="pmid1391058"></ref><ref name="ChancroidWikipedia">Chancroid. Wikipedia (July 16, 2015). https://en.wikipedia.org/wiki/Chancroid Accessed on January 6, 2016.</ref><ref name="ChancroidMedscape">Chancroid in Emergency Medicine. Medscape (February 12, 2014). http://emedicine.medscape.com/article/781520-overview#a5 Accessed January 8, 2016.</ref> | *''H. ducreyi'' recruits inflammatory cells to the infected area and induces secretion of interleukin 6 (IL-6) and interleukin 8 (IL-8) from epithelial cells. IL-8 induces neutrophils and macrophages to form abscesses, which may cause the presentation of erythematous papules which progress into intradermal pustules.<ref name="pmid1391058"></ref><ref name="ChancroidWikipedia">Chancroid. Wikipedia (July 16, 2015). https://en.wikipedia.org/wiki/Chancroid Accessed on January 6, 2016.</ref><ref name="ChancroidMedscape">Chancroid in Emergency Medicine. Medscape (February 12, 2014). http://emedicine.medscape.com/article/781520-overview#a5 Accessed January 8, 2016.</ref> | ||
*Ulcers develop after secretion of the virulence factor ''H. ducreyi'' cytolethal distending toxin (HdCDT), which causes necrosis of myeloid and epithelial cells.<ref name="ChancroidMedscape"></ref> | *Ulcers develop after secretion of the virulence factor ''H. ducreyi'' cytolethal distending toxin (HdCDT), which causes necrosis of myeloid and epithelial cells.<ref name="ChancroidMedscape"></ref> | ||
Revision as of 18:42, 8 January 2016
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Yazan Daaboul, M.D.; Nate Michalak, B.A.; Serge Korjian M.D.
Overview
Pathophysiology
Transmission
- Chancroid may develop after transmission of class I or class II of the bacterium Haemophilus ducreyi through sexual contact.[1]
- A class I gentically distinct subclade strain of H. ducreyi may serve as the etiologic agent of non-sexually transmitted skin ulcers.[2][3]
Pathogenesis
- H. ducreyi enters the skin through breaks in the epithelium.
- H. ducreyi produces 3 fimbrialike proteins (Flp), Flp1, Flp2, and Flp3, that help the bacteria adhere to subcutaneous epithelial cells and fibroblasts.[4][5]
- H. ducreyi recruits inflammatory cells to the infected area and induces secretion of interleukin 6 (IL-6) and interleukin 8 (IL-8) from epithelial cells. IL-8 induces neutrophils and macrophages to form abscesses, which may cause the presentation of erythematous papules which progress into intradermal pustules.[5][6][7]
- Ulcers develop after secretion of the virulence factor H. ducreyi cytolethal distending toxin (HdCDT), which causes necrosis of myeloid and epithelial cells.[7]
- It is presumed that iron plays an essential role in chancroid pathogenesis.[5]
- H. ducreyi has the ability to avoid phagocytosis.[7]
References
- ↑ Chancroid. MedlinePlus (Decemner 2, 2015). https://www.nlm.nih.gov/medlineplus/ency/article/000635.htm Accessed January 6, 2015.
- ↑ Marks M, Chi KH, Vahi V, Pillay A, Sokana O, Pavluck A; et al. (2014). "Haemophilus ducreyi associated with skin ulcers among children, Solomon Islands". Emerg Infect Dis. 20 (10): 1705–7. doi:10.3201/eid2010.140573. PMC 4193279. PMID 25271477.
- ↑ Gaston JR, Roberts SA, Humphreys TL (2015). "Molecular phylogenetic analysis of non-sexually transmitted strains of Haemophilus ducreyi". PLoS One. 10 (3): e0118613. doi:10.1371/journal.pone.0118613. PMC 4361675. PMID 25774793.
- ↑ Spinola, S. M.; Fortney, K. R.; Katz, B. P.; Latimer, J. L.; Mock, J. R.; Vakevainen, M.; Hansen, E. J. (2003). "Haemophilus ducreyi Requires an Intact flp Gene Cluster for Virulence in Humans". Infection and Immunity. 71 (12): 7178–7182. doi:10.1128/IAI.71.12.7178-7182.2003. ISSN 0019-9567.
- ↑ 5.0 5.1 5.2 Abeck D, Johnson AP (1992). "Pathophysiological concept of Haemophilus ducreyi infection (chancroid)". Int J STD AIDS. 3 (5): 319–23. PMID 1391058.
- ↑ Chancroid. Wikipedia (July 16, 2015). https://en.wikipedia.org/wiki/Chancroid Accessed on January 6, 2016.
- ↑ 7.0 7.1 7.2 Chancroid in Emergency Medicine. Medscape (February 12, 2014). http://emedicine.medscape.com/article/781520-overview#a5 Accessed January 8, 2016.