RESUMEN
Acinetobacter baumannii is a opportunistic bacterial pathogen responsible for serious nosocomial infections that is becoming increasingly resistant against antibiotics. Capsular polysaccharides (CPS) that cover A. baumannii are a major virulence factor that play an important role in pathogenesis, are used to assign serotypes and provide the basis for vaccine development. Synthetic oligosaccharides resembling the CPS of A. baumannii 17978 were printed onto microarray slides and used to screen sera from patients infected with A. baumannii as well as a monoclonal mouse antibody (mAb C8). A synthetic oligosaccharide emerged from glycan array screening as lead for the development of a vaccine against A. baumannii 17978. Tetrasaccharide 20 is a key epitope for recognition by an antibody and is a vaccine lead.
Asunto(s)
Infecciones por Acinetobacter , Acinetobacter baumannii , Glicoconjugados , Vacunas Sintéticas , Infecciones por Acinetobacter/prevención & control , Acinetobacter baumannii/efectos de los fármacos , Animales , Antibacterianos/farmacología , Epítopos , Glicoconjugados/farmacología , Humanos , Ratones , Oligosacáridos , Polisacáridos , Vacunas Sintéticas/farmacología , Factores de VirulenciaRESUMEN
Streptococcus suis bacteria are one of the most serious health problems for pigs and an emerging zoonotic agent in humans working in the swine industry. S.â suis bacteria express capsular polysaccharides (CPS) a major bacterial virulence factor that define the serotypes. Oligosaccharides resembling the CPS of S. suis serotypes 2, 3, 9, and 14 have been synthesized, glycans related to serotypes 2 and 9 were placed on glycan array surfaces to screen blood from infected pigs. Lead antigens for the development of semi-synthetic S. suis serotypes 2 and 9 glycoconjugate veterinary vaccines were identified in this way.
Asunto(s)
Antibacterianos/farmacología , Antígenos/inmunología , Glicoconjugados/farmacología , Polisacáridos Bacterianos/inmunología , Streptococcus suis/efectos de los fármacos , Vacunas Sintéticas/farmacología , Antibacterianos/química , Antibacterianos/inmunología , Antígenos/química , Descubrimiento de Drogas , Glicoconjugados/química , Glicoconjugados/inmunología , Polisacáridos Bacterianos/química , Vacunas Sintéticas/química , Vacunas Sintéticas/inmunologíaRESUMEN
Cancer treatment with antibodies (Abs) is one of the most successful therapeutic strategies for obtaining high selectivity. In this study, α-gal-Ab conjugates were developed that dramatically increased cellular cytotoxicity by recruiting natural Abs through the interaction between α-gal and anti-gal Abs. The potency of the α-gal-Ab conjugates depended on the amount of α-gal conjugated to the antibody: the larger the amount of α-gal introduced, the higher the level of cytotoxicity observed. The conjugation of antibodies with an α-gal dendrimer allowed the introduction of large amounts of α-gal to the Ab, without loss of affinity for the target cell. The method described here will enable the re-development of Abs to improve their potency.
Asunto(s)
Anticuerpos/inmunología , Neoplasias/inmunología , Trisacáridos/inmunología , Anticuerpos/química , Conformación de Carbohidratos , Línea Celular Tumoral , Supervivencia Celular/inmunología , Humanos , Neoplasias/patología , Neoplasias/terapia , Trisacáridos/síntesis química , Trisacáridos/químicaRESUMEN
Here we report the first total synthesis of several oligosaccharides resembling the capsular polysaccharide of swine pathogen S. suis serotype 18 repeating unit [â3)-d-GalNAc(α1-3)[d-Glc(ß1-2)]-d-GalA4OAc(ß1-3)-d-GalNAc(α1-3)-d-BacNAc4NAc(α1â]n. Access to the pentasaccharide repeating unit antigen proved to be very challenging due to the poor reactivity in the context of the trisaccharide. The challenge was overcome by the creation of a galacturonic acid in a late stage of the synthesis.
Asunto(s)
Streptococcus suis , Animales , Secuencia de Carbohidratos , Glicoconjugados , Oligosacáridos , Polisacáridos Bacterianos , Serogrupo , Porcinos , Desarrollo de VacunasRESUMEN
New (-)-5',6-dimethoxyisolariciresinol-(3â³,4â³-dimethoxy)-3α-O-ß-d-glucopyranoside compound was isolated from the methanol extract of the bark of Aglaia eximia (Meliaceae). The chemical structure of the new compound were elucidated on the basis of spectroscopic data including, UV, IR, HR-ESI-TOFMS, 1D-NMR, 2D-NMR and comparison with those related compounds previously reported.