title: DNA vaccines against chronic lung infections by Pseudomonas aeruginosa.
abstract: Vaccines containing outer membrane protein F (OprF) of Pseudomonas aeruginosa are effective in reducing lesion severity in a mouse pulmonary chronic infection model. One OprF-based vaccine, called F/I, contains carboxy oprF sequences fused to oprI in an expression vector. When delivered three times biolistically by gene gun, the F/I vaccine induces protection that is antibody-mediated in outbred mice. To demonstrate the role of F/I-induced antibody-mediated immunity, B-cell-deficient [B(-)] and B-cell-intact [B(+)] mice were immunized with F/I, challenged with Pseudomonas, and examined for lesion severity. As expected, F/I-immunized B(+) mice had fewer and less severe lesions than vector-immunized B(+) mice. However, surprisingly, F/I- and vector-immunized B(-) mice were equally protected to levels similar to F/I-immunized B(+) mice. Examination of immune cell populations and cytokine levels indicated a relative increase in the quantity of CD3+ T-lymphocytes in vector- or F/I-immunized and challenged B(-) mice compared to B(+) mice. These data indicate the protective role played by cell-mediated immunity in B(-) mice, which supports our hypothesis that cell-mediated immunity can play an important role in protection against P. aeruginosa.
authors.affiliation: Department of Microbiology and Immunology, Louisiana State University Health Sciences Center, 1501 Kings Highway, Shreveport, LA 71130-3932, USA. jstacz@lsuhsc.edu
authors.forename: J
authors.initials: J
authors.lastname: Staczek
authors.forename: L B
authors.initials: LB
authors.lastname: Gilleland
authors.forename: H C
authors.initials: HC
authors.lastname: van der Heyde
authors.forename: H E
authors.initials: HE
authors.lastname: Gilleland
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood; D001428:Bacterial Vaccines / Q000235:genetics / Q000276:immunology*; D002908:Chronic Disease; D016207:Cytokines / Q000096:biosynthesis / Q000276:immunology; D004195:Disease Models, Animal; D006801:Humans; D007111:Immunity, Cellular; D007114:Immunization; D008171:Lung Diseases / Q000276:immunology / Q000382:microbiology / Q000517:prevention & control*; D051379:Mice; D008810:Mice, Inbred C57BL; D018272:Porins / Q000235:genetics / Q000276:immunology*; D011552:Pseudomonas Infections / Q000276:immunology / Q000517:prevention & control; D011550:Pseudomonas aeruginosa / Q000235:genetics / Q000276:immunology*; D016896:Treatment Outcome; D019444:Vaccines, DNA / Q000008:administration & dosage / Q000276:immunology*
chemical_list: D000907:Antibodies, Bacterial; D001428:Bacterial Vaccines; D016207:Cytokines; D018272:Porins; D019444:Vaccines, DNA