RESUMO
Cutaneous leishmaniasis (CL) treatment is based on therapy with Glucantime® , yet, there are few laboratory methods to monitor its success. In this study, ex vivo and in vitro evaluations of peripheral blood monocytes were performed in a longitudinal study to characterize the impact of Glucantime® on overall phenotypic/functional features of these cells from CL patients to identify predictive biomarkers for post-therapeutic monitoring by flow cytometry. The ex vivo evaluation from CL patients demonstrated a modulatory profile before treatment, with a decrease in TLR-2, FcγRII, HLA-DR, CD86, IFN-γR, TNF, IL-12, NO, and an increase in FcγRIII and IL-10R. Conversely, treatment changes some of these biomarker expressions by decreasing FcγRIII and IL-10R and increasing IFN-γR, IL-12 and NO. Moreover, an in vitro analysis of these patients showed a reduced phagocytic capacity of Leishmania braziliensis and higher levels of IL-10 and TGF-ß modulating functional profile. Regardless of the compromised L. braziliensis phagocytic capacity, treatment re-established the production of IL-12, IL-10, TGF-ß and NO at the basal level. Notably, monocytes from patients with early cicatrization showed enhanced FcγRI and FcγRII expressions and reduced IL-10, which was further corroborated by a baseline fold change analysis. Finally, the logistic regression model emphasized the performance of FcγRI, FcγRII and IL-10 as robust predictive biomarkers for post-therapeutic cicatrization during cutaneous leishmaniasis.
Assuntos
Biomarcadores/análise , Leishmania braziliensis/imunologia , Leishmaniose Cutânea/imunologia , Receptores de IgG/análise , Adulto , Cicatriz , Citocinas/análise , Feminino , Citometria de Fluxo , Humanos , Interleucina-10/análise , Leishmaniose Cutânea/tratamento farmacológico , Leishmaniose Cutânea/parasitologia , Leishmaniose Cutânea/patologia , Modelos Logísticos , Estudos Longitudinais , Masculino , Pessoa de Meia-Idade , Monócitos/imunologia , Adulto JovemRESUMO
We examined the correspondence in performance between trees selected from a family test and their respective clones from a clonal test of Eucalyptus. Full-sib families were obtained from controlled pollination among individuals of Eucalyptus grandis and between E. grandis and E. urophylla. The hybridizations did not follow a factorial scheme. The family tests were carried out at three locations in Eunápolis and Itabela counties, in Bahia, Brazil, in 2003. Four hundred and ninety-seven high-performance trees were selected, by the individual BLUP procedure, in the family tests at two years of age, based on wood volume. The clones from these trees and 14 checks were evaluated in clonal tests carried out in the same region in 2006. The wood volume of the clones was evaluated at two years of age. Trait correlation between the trees selected from the family and clonal tests was low. The estimate of the coincidence between the best trees and the best clones using an average of the different intensities of selection was only 27%. These results demonstrate that the selection of trees in the family test should not be too drastic; otherwise the chance plus clones may be overlooked.
Assuntos
Eucalyptus/genética , Especificidade da EspécieRESUMO
Helicobacter pylori adhesion to gastric epithelial cells constitutes a key step in the establishment of a successful infection of the gastric mucosa. The high representation of outer membrane proteins in the bacterial genome suggests the relevance of those proteins in the establishment of profitable interactions with the host gastric cells. Gastric epithelial cells are protected by a mucous layer gel, mainly consisting of the MUC5AC and MUC6 mucins. In addition to this protective role, mucins harbor glycan-rich domains that constitute preferential binding sites of many pathogens. In this article we review the main players in the process of H. pylori adhesion to gastric epithelial cells, which contribute decisively to the high prevalence and chronicity of H. pylori infection. The BabA adhesin recognizes both H-type 1 and Lewis b blood-group antigens expressed on normal gastric mucosa of secretor individuals, contributing to the initial steps of infection. Upon colonization, persistent infection induces an inflammatory response with concomitant expression of sialylated antigens. The SabA adhesin mediates H. pylori binding to inflamed gastric mucosa by recognizing sialyl-Lewis a and sialyl-Lewis x antigens. The expression of the BabA and SabA adhesins is tightly regulated, permitting the bacteria to rapidly adapt to the changes of glycosylation of the host gastric mucosa that occur during infection, as well as to escape from the inflammatory response. The growing knowledge of the interactions between the bacterial adhesins and the host receptors will contribute to the design of alternative strategies for eradication of the infection.
Assuntos
Animais , Humanos , Antígenos de Bactérias/metabolismo , Aderência Bacteriana/fisiologia , Células Epiteliais/microbiologia , Mucosa Gástrica/microbiologia , Infecções por Helicobacter/microbiologia , Helicobacter pylori/fisiologia , Adesinas Bacterianas/metabolismo , /metabolismo , Helicobacter pylori/metabolismo , Antígenos do Grupo Sanguíneo de Lewis/metabolismoRESUMO
Helicobacter pylori adhesion to gastric epithelial cells constitutes a key step in the establishment of a successful infection of the gastric mucosa. The high representation of outer membrane proteins in the bacterial genome suggests the relevance of those proteins in the establishment of profitable interactions with the host gastric cells. Gastric epithelial cells are protected by a mucous layer gel, mainly consisting of the MUC5AC and MUC6 mucins. In addition to this protective role, mucins harbor glycan-rich domains that constitute preferential binding sites of many pathogens. In this article we review the main players in the process of H. pylori adhesion to gastric epithelial cells, which contribute decisively to the high prevalence and chronicity of H. pylori infection. The BabA adhesin recognizes both H-type 1 and Lewis b blood-group antigens expressed on normal gastric mucosa of secretor individuals, contributing to the initial steps of infection. Upon colonization, persistent infection induces an inflammatory response with concomitant expression of sialylated antigens. The SabA adhesin mediates H. pylori binding to inflamed gastric mucosa by recognizing sialyl-Lewis a and sialyl-Lewis x antigens. The expression of the BabA and SabA adhesins is tightly regulated, permitting the bacteria to rapidly adapt to the changes of glycosylation of the host gastric mucosa that occur during infection, as well as to escape from the inflammatory response. The growing knowledge of the interactions between the bacterial adhesins and the host receptors will contribute to the design of alternative strategies for eradication of the infection.
Assuntos
Antígenos de Bactérias/metabolismo , Aderência Bacteriana/fisiologia , Células Epiteliais/microbiologia , Mucosa Gástrica/microbiologia , Infecções por Helicobacter/microbiologia , Helicobacter pylori/fisiologia , Adesinas Bacterianas/metabolismo , Animais , Helicobacter pylori/metabolismo , Humanos , Antígenos do Grupo Sanguíneo de Lewis/metabolismo , Antígenos CD15/metabolismoRESUMO
Carbamate insecticides (mainly aldicarb) are illegally commercialized as rat poisons and commonly used by the population of Rio de Janeiro for this purpose. A retrospective study concerning 189 cases (80 men, 109 women) of carbamate poisoning referred to the Poison Control Center of Rio de Janeiro throughout 1993 is described. The causes of carbamate poisoning were suicide attempts (65%) and accidental ingestions (35%). The main signs and symptoms found (86%) were those related to the SLUDGE syndrome (increased salivation, lacrimation, urinary incontinence, diarrhea, gastrointestinal cramping and emesis) which were more commonly seen in adults than in children. Despite treatment with atropine, the case-fatality was 4%. It is concluded that there is a widespread risk of carbamate poisoning in Rio de Janeiro due to its clandestine use as a rodenticide. Effective measures by the government authorities should be implemented to stamp out the illicit commercialization of these compounds.