title: Identification of immunodominant antigens of Chlamydia trachomatis using proteome microarrays.
abstract: Chlamydia trachomatis is the most common bacterial sexually transmitted pathogen in the world. In order to control this infection there is an urgent need to formulate a vaccine. Identification of protective antigens is required to implement a subunit vaccine. To identify potential antigen vaccine candidates, three strains of mice, BALB/c, C3H/HeN and C57BL/6, were inoculated with live and inactivated C. trachomatis mouse pneumonitis (MoPn) by different routes of immunization. Using a protein microarray, serum samples collected after immunization were tested for the presence of antibodies against specific chlamydial antigens. A total of 225 open reading frames (ORF) of the C. trachomatis genome were cloned, expressed, and printed in the microarray. Using this protein microarray, a total of seven C. trachomatis dominant antigens were identified (TC0052, TC0189, TC0582, TC0660, TC0726, TC0816 and, TC0828) as recognized by IgG antibodies from all three strains of animals after immunization. In addition, the microarray was probed to determine if the antibody response exhibited a Th1 or Th2 bias. Animals immunized with live organisms mounted a predominant Th1 response against most of the chlamydial antigens while mice immunized with inactivated Chlamydia mounted a Th2-biased response. In conclusion, using a high throughput protein microarray we have identified a set of novel proteins that can be tested for their ability to protect against a chlamydial infection.
authors.affiliation: ImmPORT Therapeutics, 1 Technology Drive, Suite E309, Irvine, CA 92618, USA.
authors.forename: Douglas M
authors.initials: DM
authors.lastname: Molina
authors.forename: Sukumar
authors.initials: S
authors.lastname: Pal
authors.forename: Mathew A
authors.initials: MA
authors.lastname: Kayala
authors.forename: Andy
authors.initials: A
authors.lastname: Teng
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Kim
authors.forename: Pierre
authors.initials: P
authors.lastname: Baldi
authors.forename: Philip L
authors.initials: PL
authors.lastname: Felgner
authors.forename: Xiaowu
authors.initials: X
authors.lastname: Liang
authors.forename: Luis M
authors.initials: LM
authors.lastname: de la Maza
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood*; D000942:Antigens, Bacterial / Q000032:analysis / Q000276:immunology*; D001426:Bacterial Proteins / Q000032:analysis / Q000276:immunology*; D002692:Chlamydia trachomatis / Q000276:immunology*; D005260:Female; D016056:Immunodominant Epitopes / Q000032:analysis / Q000276:immunology*; D007074:Immunoglobulin G / Q000097:blood; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D040081:Protein Array Analysis; D018417:Th1 Cells / Q000276:immunology; D018418:Th2 Cells / Q000276:immunology
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D016056:Immunodominant Epitopes; D007074:Immunoglobulin G