998 resultados para humanos


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Type-1 diabetes patients suffer from frequent episodes of acidosis caused by an increased fatty acid metabolism and consequently increased plasma level of acetoacetate (AcAc) and β-hydroxybutyrate (β-HOB). This article describes a study of the effects of pathological concentrations of AcAc and β-HOB on lipoperoxidation, cell viability and the release of the CXCL8 (IL-8) cytokine by activated neutrophils. Neutrophils from healthy donors were isolated by density gradient (Histopaque® 1077/1119) and incubated with the ketone bodies. Lipoperoxidation was determined as thiobarbituric acid reactive substances (TBARS). The cell viability was evaluated by the release of intracellular lactate dehydrogenase. The release of CXCL8 was measured by ELISA in a 24-h culture of opsonized zymosan-stimulated neutrophils. AcAc, but not β-HOB, provoked a dose-dependent increase in the neutrophil membrane lipoperoxidation (p<0.05; r =0.9915). In the cytotoxicity assay, a dose-dependent release of LDH was observed when the neutrophils were incubated with AcAc in concentrations up to 40 mM (p<0.05). β-HOB was devoid of effect. The release of CXCL8 was inhibited by AcAc and β-HOB in a dose-dependent manner. In conclusion, these results suggest that the accumulation of ketone bodies in diabetic patients could be involved in their usually increased susceptibility to infection.

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En la presente publicación se recogen las intervenciones realizadas por diversas personalidades en el acto solemne celebrado el 12 de noviembre de 2012 en la sede de la Comisión Económica para América Latina y el Caribe (CEPAL), en conjunto con la Embajada de Israel y la Embajada de Suecia en Chile, con motivo del centenario del nacimiento de Raoul Wallenberg (1912-1947). La extraordinaria labor humanitaria desplegada por este diplomático sueco durante la Segunda Guerra Mundial es bien conocida en todo el mundo. Sus esfuerzos por salvar judíos húngaros de los horrores del Holocausto nazi son realmente asombrosos y únicos. Él, que libró a tantos de la muerte segura, que escamoteó miles de víctimas a los verdugos del totalitarismo racista, sucumbió a su vez en las manos de nuevos verdugos. Con la perspectiva de los años, su figura emerge como expresión concreta de humanismo y como inspiración para las nuevas generaciones.

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