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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Immunogenicity of antigens from outer membrane vesicles of Neisseria meningitidis associated with bilayer fragment of dioctadecyldimethylammonium in Swiss adult mice

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Author(s):
Rinaldi, Fabiana Mahylowski [1] ; Gaspar, Emanuelle Baldo [2] ; Brito, Luciana Tendolini [1] ; De Gaspari, Elizabeth [1]
Total Authors: 4
Affiliation:
[1] Adolfo Lutz Inst, Dept Immunol, Sao Paulo - Brazil
[2] Embrapa Southern Reg Anim Husb, Bage - Brazil
Total Affiliations: 2
Document type: Journal article
Source: CLINICAL AND EXPERIMENTAL VACCINE RESEARCH; v. 10, n. 2, p. 106-122, MAY 2021.
Web of Science Citations: 0
Abstract

Purpose: In the present study, meningococcal serogroup B outer membrane vesicles (OMVs) were associated with bilayer fragments of a cationic lipid, dioctadecyldimethylammonium (DDA-BF), used as adjuvant, in an antigenic preparation tested in adult female outbred mice. This adjuvant was compared to the traditional adjuvant aluminum hydroxide. Materials and Methods: The potential in generating humoral response was evaluated by enzyme-linked immunosorbent assay (ELISA). Individual serum was collected and immunoglobulin G (IgG), IgG1, IgG2a, and IgG2b were quantified. Analyses were carried out 15 and 60 days after immunization. Antibodies avidity index were also analyzed by ELISA. Immunoblot and dot-ELI SA were carried out to evaluate specific reaction for homologous strains and cross-reactive antigens present in other meningococcal strains isolated in 2011-2012 year, in Brazil. Delayed type hypersensitivity was used as indicative of cellular immunity and compared between two experimental groups, 24 hours after homologous strain challenge. Results: The OMVs of Neisseria meningitidis, and N. lactamica (related species) were characterized by electrophoretic separation of proteins in 13% polyacrylamide gel. The strains presented antigens in the range of 8 to 130 kDa, showing a heterogeneous protein migration pattern. In the group immunized with OMVs/DDA-BF, we found no significant production of total IgG 15 days after the first immunization. On the other hand, 60 days after first immunization both adjuvants act benefiting total IgG production similarly. The antibodies of the IgG isotype produced by animals immunized after one or two doses after first immunization, showed intermediate and high avidity, independent on the adjuvant used. In both experimental groups the swelling of the footpads was significantly higher than those of the controls, suggesting that only one dose was enough to stimulate the generation of cellular immunity. Conclusion: The use of this cationic adjuvant for N. meningitidis OMVs preparation revealed good potential for future new antigen preparation for N. meningitidis vaccine. (AU)

FAPESP's process: 13/11147-2 - Study of the immunogenicity of outer membrane antigens of Neisseria meningitidis and interaction with cationic lipids: evaluation of different immunization schedules in different strains of mice
Grantee:Luciana Tendolini Brito
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 12/15568-0 - Study of the immunogenicity of outer membrane antigens of Neisseria meningitidis and interaction with cationic lipids: evaluation of different immunization schedules in different strains of mice
Grantee:Elizabeth Natal de Gaspari
Support Opportunities: Regular Research Grants