title: An in vitro model of infection of human biliary epithelial cells by Cryptosporidium parvum.
abstract: Cryptosporidium parvum infection in the immunosuppressed host is frequently complicated by biliary tract involvement. The recent production of human biliary epithelial cell lines was exploited to develop an in vitro model of biliary cryptosporidiosis. Infection with C. parvum oocysts was detected by IFA and ELISA and confirmed by transmission electron microscopy. Inoculation of monolayers with 10(4) to 5 X 10(5) oocysts/well resulted in a dose-dependent increase in infection. Time-course experiments showed that the number of parasitic stages was maximal at 18-24 h after inoculation. Infection was significantly enhanced by bile at concentrations of 50 and 100 microg/mL and inhibited by 400 microg/mL paromomycin. Infection of human biliary cells with C. parvum can be consistently achieved and monitored by use of IFA or ELISA. This system will be of use in evaluating mechanisms of C. parvum infection and response to therapeutic agents in biliary cryptosporidiosis.
authors.affiliation: Department of Medicine, New England Medical Center, Boston, Massachusetts 02111, USA.
authors.forename: R
authors.initials: R
authors.lastname: Verdon
authors.forename: G T
authors.initials: GT
authors.lastname: Keusch
authors.forename: S
authors.initials: S
authors.lastname: Tzipori
authors.forename: S A
authors.initials: SA
authors.lastname: Grubman
authors.forename: D M
authors.initials: DM
authors.lastname: Jefferson
authors.forename: H D
authors.initials: HD
authors.lastname: Ward
mesh_terms: D000563:Amebicides / Q000494:pharmacology; D000818:Animals; D001659:Biliary Tract / Q000469:parasitology* / Q000502:physiology*; D001660:Biliary Tract Diseases / Q000503:physiopathology; D002417:Cattle; D002460:Cell Line; D003457:Cryptosporidiosis / Q000503:physiopathology*; D016785:Cryptosporidium parvum / Q000187:drug effects / Q000502:physiology*; D004848:Epithelium / Q000469:parasitology / Q000502:physiology; D006801:Humans; D008954:Models, Biological; D010303:Paromomycin / Q000494:pharmacology; D014407:Tumor Cells, Cultured
chemical_list: D000563:Amebicides; D010303:Paromomycin