JEFFERSON RUSSO VICTOR
Projetos de Pesquisa
Unidades Organizacionais
Instituto Central, Hospital das Clínicas, Faculdade de Medicina
LIM/56 - Laboratório de Investigação em Dermatologia e Imunodeficiências, Hospital das Clínicas, Faculdade de Medicina
LIM/56 - Laboratório de Investigação em Dermatologia e Imunodeficiências, Hospital das Clínicas, Faculdade de Medicina
3 resultados
Resultados de Busca
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- Allergen-specific IgG as a mediator of allergy inhibition: Lessons from mother to child(2017) VICTOR, Jefferson RussoAllergen-specific IgG produced by immune mothers is associated with less predisposition to allergy development in their children. This finding has been described by several groups over the last few decades, but the mechanisms by which maternal IgG can inhibit allergy development are still not fully understood. With the purpose of summarizing past investigations, we review the literature on murine models of maternal immunization with allergens and on immune regulation in humans after passive therapy with purified IgG. Based on our review, a new hypothesis about these mechanisms is presented, which may provide a foundation for the future development of therapies to inhibit allergy development.
- Low doses of IgG from atopic individuals can modulate in vitro IFN-gamma production by human intra-thymic TCD4 and TCD8 cells: An IVIg comparative approach(2017) SGNOTTO, Fabio da Ressureicao; OLIVEIRA, Marilia Garcia de; LIRA, Aline Aparecida de Lima; BENTO-DE-SOUZA, Luciana; DUARTE, Alberto Jose da Silva; VICTOR, Jefferson RussoThe regulatory effect of allergic responses induced by IgG antibodies on human intra-thymic cells has not been reported in the literature. The aim of this study was to evaluate the possible differential effect of purified IgG from atopic and non-atopic individuals on human intra-thymic T cell cytokine production. Thymic tissues were obtained from 14 patients who were less than 7 d old. Additionally, blood samples were collected from atopic and non-atopic volunteers. Thymocytes and peripheral blood mononuclear cells were cultured with purified atopic or non-atopic IgG, and intracellular cytokine production was assessed. Purified IgG did not influence the frequency or viability of human intra-thymic T cells. Purified non-atopic IgG induced greater IFN-gamma production by intra-thymic CD4+CD8+ T cells than did the mock treatment and atopic IgG. A similar effect of purified non-atopic IgG on TCD8 cells was observed compared with the mock treatment. Atopic IgG inhibited IFN-gamma and TGF-beta production by intra-thymic TCD4 cells. Treatment with intravenous immunoglobulin resulted in intermediate levels of IFN-gamma and TGF-beta in intra-thymic TCD4 cells compared with treatment with atopic and non-atopic IgG. Peripheral TCD4 cells from non-atopic individuals produced IFN-gamma only in response to atopic IgG. This report describes novel evidence revealing that IgG from atopic individuals may influence intracellular IFN-gamma production by intra-thymic T cells in a manner that may favor allergy development.
- Preconception allergen sensitization can induce B10 cells in offspring: a potential main role for maternal IgG(2017) OLIVEIRA, Marlia Garcia de; OLIVEIRA, Luana de Mendonca; LIRA, Aline Aparecida de Lima; SGNOTTO, Fabio da Ressureicao; DUARTE, Alberto Jose da Silva; SATO, Maria Notomi; VICTOR, Jefferson RussoBackground: The mechanisms through which allergies can be inhibited after preconception immunization with allergens are not fully understood. We aimed to evaluate whether maternal immunization can induce a regulatory B (B10) cell population in offspring in concert with allergy inhibition. Methods: C57BL/6 females were or were not immunized with OVA and were mated with normal WT males. Their offspring were evaluated at 3 days of age or 20 days after neonatal immunization. Human peripheral B cells from atopic and non-atopic individuals were also evaluated. Results: Preconception OVA immunization induced B10 cells in offspring, and IL-10 production appeared to be critical for FcyRIIB upregulation in offspring B cells. Murine and human IL-10-producing B cells responded in vitro to IgG according to the atopic repertoire of the cells. Conclusions: Our results reveal that maternal immunization induces allergen-specific B10 cells in offspring and a pivotal role for the IgG repertoire in IL-10 production by murine and human B cells.