title: The role of complement receptor 3 (CR3) in Neisseria gonorrhoeae infection of human cervical epithelia.
abstract: Neisseria gonorrhoeae is an important sexually transmitted pathogen and a major cofactor in HIV-1 infection. This organism uses different mechanisms to infect male and female genital tract epithelia. Receptor-mediated endocytosis of N. gonorrhoeae is the principle mechanism of entry into male urethral epithelial cells. Infection in men leads to a pronounced inflammatory response. In contrast, N. gonorrhoeae infection in women induces ruffling of the cervical epithelia, allowing a macropinocytic mechanism of entry. Infection in women is frequently asymptomatic, suggesting suppression of the inflammatory response. N. gonorrhoeae-induced membrane ruffling and inflammation suppression are consistent with the ability of this bacterium to enter cervical epithelial cells, in vitro and in vivo, by interaction with complement receptor 3 (CR3), a receptor that does not trigger an inflammatory response. This receptor is present on cervical epithelial cells but not on male urogenital tract epithelia. N. gonorrhoeae engagement of CR3 initiates a unique mechanism of bacterial-induced membrane ruffling and internalization. These studies explain why the pathology of N. gonorrhoeae infection differs between males and females. Additionally, the observation that this receptor is present on cervical epithelia may provide insight into the pathogenesis of other sexually transmitted pathogens.
authors.affiliation: Department of Microbiology, University of Iowa, Iowa City, IA 52242, USA.
authors.forename: J L
authors.initials: JL
authors.lastname: Edwards
authors.forename: E J
authors.initials: EJ
authors.lastname: Brown
authors.forename: K A
authors.initials: KA
authors.lastname: Ault
authors.forename: M A
authors.initials: MA
authors.lastname: Apicella
mesh_terms: D000818:Animals; D001706:Biopsy; D018821:CD18 Antigens / Q000378:metabolism; D002460:Cell Line; D002462:Cell Membrane / Q000648:ultrastructure; D002584:Cervix Uteri / Q000276:immunology* / Q000382:microbiology* / Q000473:pathology; D004705:Endocytosis / Q000502:physiology; D004847:Epithelial Cells / Q000276:immunology / Q000382:microbiology / Q000473:pathology; D005260:Female; D017930:Genes, Reporter; D006069:Gonorrhea / Q000276:immunology / Q000382:microbiology* / Q000473:pathology; D049452:Green Fluorescent Proteins; D006801:Humans; D015151:Immunoblotting; D007202:Indicators and Reagents / Q000378:metabolism; D008164:Luminescent Proteins / Q000378:metabolism; D016177:Macrophage-1 Antigen / Q000378:metabolism*; D008297:Male; D018613:Microscopy, Confocal; D008856:Microscopy, Fluorescence; D009344:Neisseria gonorrhoeae / Q000235:genetics / Q000502:physiology* / Q000648:ultrastructure; D011233:Precipitin Tests
chemical_list: D018821:CD18 Antigens; D007202:Indicators and Reagents; D008164:Luminescent Proteins; D016177:Macrophage-1 Antigen; D049452:Green Fluorescent Proteins