PATRICIA PALMEIRA DAENEKAS JORGE
Projetos de Pesquisa
Unidades Organizacionais
LIM/36 - Laboratório de Pediatria Clínica, Hospital das Clínicas, Faculdade de Medicina
4 resultados
Resultados de Busca
Agora exibindo 1 - 4 de 4
- Transplacental Total IgG Transfer in Twin Pregnancies(2014) STACH, Sonia C. L.; BRIZOT, Maria de L.; LIAO, Adolfo W.; FRANCISCO, Rossana P. V.; PALMEIRA, Patricia; CARNEIRO-SAMPAIO, Magda; ZUGAIB, MarceloProblemIn twin pregnancies, factors that influence total umbilical cord IgG concentration and IgG transfer ratio are not well known. MethodBlood samples were prospectively collected from 57 twin pregnancies. Stepwise multivariate regression analysis was used to evaluate the association between total IgG levels in the umbilical cord blood and IgG transfer ratio according to serum IgG concentration, pregnancy chorionicity, the presence of abnormal umbilical artery pulsatility index, intrauterine growth restriction, gestational age at delivery (GAD), birthweight, and placental weight. ResultsUmbilical cord IgG concentration showed a positive correlation with serum IgG concentration and GAD; levels were significantly lower in monochorionic compared with dichorionic pregnancies. IgG transfer ratio also increased with GAD but was inversely correlated with serum IgG concentration levels. ConclusionIn twin pregnancies, besides serum IgG concentration and GAD, chorionicity also influences umbilical cord IgG concentration. Monochorionic twins have lower IgG cord concentration than dichorionic twins.
- Phenotypic Differences in Leucocyte Populations among Healthy Preterm and Full-Term Newborns(2014) QUINELLO, C.; SILVEIRA-LESSA, A. L.; CECCON, M. E. J. R.; CIANCIARULLO, M. A.; CARNEIRO-SAMPAIO, M.; PALMEIRA, P.The immune system of neonates has been considered functionally immature, and due to their high susceptibility to infections, the aim of this study was to analyse the phenotypic differences in leucocyte populations in healthy preterm and full-term newborns. We evaluated the absolute numbers and frequencies of dendritic cells (DCs) and DC subsets, monocytes and T and B lymphocytes and subsets in the cord blood of healthy moderate and very preterm (Group 1), late preterm (Group 2) and full-term (Group 3) newborns and in healthy adults, as controls, by flow cytometry. The analyses revealed statistically higher absolute cell numbers in neonates compared with adults due to the characteristic leucocytosis of neonates. We observed a lower frequency of CD80+ myeloid and plasmacytoid DCs in Group 1 and reduced expression of TLR-4 on myeloid DCs in all neonates compared with adults. TLR-2+ monocytes were reduced in Group 1 compared with Groups 2 and 3, and TLR-4+ monocytes were reduced in Groups 1 and 2 compared with Group 3. The frequencies and numbers of naive CD4+ T and CD19+ B cells were higher in the three groups of neonates compared with adults, while CD4+ effector and effector memory T cells and CD19+ memory B cells were elevated in adults compared with neonates, as expected. Our study provides reference values for leucocytes in cord blood from term and preterm newborns, which may facilitate the identification of immunological deficiencies in protection against extracellular pathogens.
- Caffeic Acid Phenethyl Ester: Consequences of Its Hydrophobicity in the Oxidative Functions and Cytokine Release by Leukocytes(2014) PARACATU, Luana Chiquetto; FARIA, Carolina Maria Quinello Gomes; QUINELLO, Camila; RENNO, Camila; PALMEIRA, Patricia; ZERAIK, Maria Luiza; FONSECA, Luiz Marcos da; XIMENES, Valdecir FariasNumerous anti-inflammatory properties have been attributed to caffeic acid phenethyl ester (CAPE), an active component of propolis. NADPH oxidases are multienzymatic complexes involved in many inflammatory diseases. Here, we studied the importance of the CAPE hydrophobicity on cell-free antioxidant capacity, inhibition of the NADPH oxidase and hypochlorous acid production, and release of TNF-alpha and IL-10 by activated leukocytes. The comparison was made with the related, but less hydrophobic, caffeic and chlorogenic acids. Cell-free studies such as superoxide anion scavenging assay, triene degradation, and anodic peak potential (E-pa) measurements showed that the alterations in the hydrophobicity did not provoke significant changes in the oxidation potential and antiradical potency of the tested compounds. However, only CAPE was able to inhibit the production of superoxide anion by activated leukocytes. The inhibition of the NADPH oxidase resulted in the blockage of production of hypochlorous acid. Similarly, CAPE was the more effective inhibitor of the release of TNF-alpha and IL-10 by Staphylococcus aureus stimulated cells. In conclusion, the presence of the catechol moiety and the higher hydrophobicity were essential for the biological effects. Considering the involvement of NADPH oxidases in the genesis and progression of inflammatory diseases, CAPE should be considered as a promising anti-inflammatory drug.
- TLR-2 and TLR-4 expression in monocytes of newborns with late-onset sepsis(2014) REDONDO, Ana C. C.; CECCON, Maria E. J. R.; SILVEIRA-LESSA, Ana L.; QUINELLO, Camila; PALMEIRA, Patricia; CARVALHO, Werther B.; CARNEIRO-SAMPAIO, MagdaObjective: To analyze toll-like receptor (TLR)-2 and TLR-4 expression in monocytes of newborns with late-onset sepsis. Methods: This prospective study included 27 full-term newborns aged 8 to 29 days, with clinical and laboratory diagnosis of late-onset sepsis. Ten newborns (37%) had positive cultures. Cytokines were measured by cytometric bead array in peripheral blood, while TLR-2, TLR-4 expression, and median fluorescence intensity (MFI) were determined by immunophenotyping peripheral whole blood monocytes, and were analyzed with a BD FACSDiva flow cytometer (Becton, Dickinson and Company, USA). A comparison was performed with healthy adults. Results: Microorganisms were identified in 37% of these septic newborns, and all of them had high levels of pro-inflammatory cytokines (IL-8, IL-6, IL-1 beta) and anti-inflammatory cytokine (IL-10) corroborating the inflammatory/septic process. In monocytes, the frequency of TLR-4 expression was higher in infected newborns (p = 0.01). Conclusion: This study investigated the innate immune response in septic newborns. Septic newborns that relied almost exclusively on the innate immune system showed little in vivo response at nnonocyte activation, suggesting impaired immune response and increased susceptibility to infection.