LUIZA DE CAMPOS REIS

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LIM/38 - Laboratório de Epidemiologia e Imunobiologia, Hospital das Clínicas, Faculdade de Medicina

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  • article 0 Citação(ões) na Scopus
    Staphylococcus aureus-Cure-Associated Antigens Elicit Type 3 Immune Memory T Cells
    (2022) SANTOS, Kamila R.; SOUZA, Fernando N.; RAMOS-SANCHEZ, Eduardo M.; BATISTA, Camila F.; REIS, Luiza C.; FOTORAN, Wesley L.; HEINEMANN, Marcos B.; CUNHA, Adriano F.; ROCHA, Mussya C.; FARIA, Angelica R.; ANDRADE, Helida M.; CERQUEIRA, Monica M. O. P.; GIDLUND, Magnus; GOTO, Hiro; LIBERA, Alice Maria M. P. Della
    Background: Staphylococcus aureus is one of the most frequently major mastitis pathogens that cause clinical and subclinical mastitis worldwide. Current antimicrobial treatments are usually ineffective, and the commercially available vaccines lack proven effectiveness. The immunological response elicited by the recombinant S. aureus-cure-associated proteins phosphoglycerate kinase (PGK), enolase (ENO), and elongation factor-G (EF-G) in combination with the granulocyte-macrophage colony-stimulating factor (GM-CSF) DNA vaccination was studied in this work. Methods: Here, twenty-three C57BL/6 mice were divided into four groups and vaccinated with: G1: none (control); G2: GM-CSF DNA plasmid DNA vaccine; G3: the combination of EF-G+ENO+PGK; and G4: the combinations of EF-G+ENO+PGK proteins plus GM-CSF plasmid DNA vaccine. After 44 days, spleen cells were collected for immunophenotyping and lymphocyte proliferation evaluation by flow cytometry upon S. aureus stimulus. Results: Immunization with the three S. aureus recombinant proteins alone resulted in a higher percentage of IL-17A(+) cells among CD8(+) T central memory cells, as well as the highest intensity of IL-17A production by overall lymphocytes indicating that the contribution of the combined lymphocyte populations is crucial to sustaining a type 3 cell immunity environment. Conclusion: The immunization with three S. aureus-cure-associated recombinant proteins triggered type 3 immunity, which is a highly interesting path to pursue an effective bovine S. aureus mastitis vaccine.
  • article 1 Citação(ões) na Scopus
    Memory CD4+ and CD8+ T lymphocyte proliferation in vaccinated dairy cows with different histories of Staphylococcus aureus mastitis
    (2022) SOARES, Thais C. S.; SANTOS, Kamila R.; LIMA, Daniel M.; MAIA, Raysa Brenda M.; RAMOS-SANCHEZ, Eduardo M.; REIS, Luiza C.; GIDLUND, Magnus; CUNHA, Adriano F. da; ORDINOLA-RAMIREZ, Carla M.; CERQUEIRA, Monica M. O. P.; HEINEMANN, Marcos B.; LIBERA, Alice M. M. P. Della; GOTO, Hiro; SOUZA, Fernando N.
    Staphylococcus aureus mastitis constitutes a serious threat to dairy cows. The reasons why available vaccines are not fully effective remain poorly understood; thus, in the present study, we investigated CD4(+) and CD8(+) T lymphocyte proliferation in dairy cows vaccinated with a polyvalent mastitis vaccine that had distinct precedent Staphylococcus aureus mastitis. We studied 17 S. aureus-infected dairy cows (11 vaccinated and six unvaccinated) and eight vaccinated healthy dairy cows with no previous S. aureus mastitis infections. Flow cytometry was used to assess lymphocyte proliferation using an anti-Ki67 antibody, and monoclonal antibodies were used to identify T cell subsets. S. aureus-infected cows exhibited reduced overall lymphocyte proliferation, including CD4(+) T lymphocyte proliferation, and memory lymphocyte proliferation in response to S. aureus isolate stimulus. Immunization did not influence the expansion of blood lymphocyte populations. Furthermore, CD8(+) T cells, memory CD8(+) T lymphocytes, and effector memory CD8(+) T lymphocytes displayed reduced proliferation 21 days after the third vaccine dose compared with before vaccination at time zero. The present data demonstrates an overall negative regulation of the T-cell response suggesting its detrimental impact leading to the persistence of S. aureus intramammary infections. Furthermore, the lack of vaccination effect on T-cell mediated immunity (e.g., proliferation) may be related to poor vaccine efficacy.