RESUMEN
The white adipose tissue (WAT) contributes to the metabolic imbalance observed in obesity and the metabolic syndrome (MetS) by mechanisms that are poorly understood. The aim of this study was to monitor changes in the transcriptome of epididymal WAT during the development of MetS. ApoE3L.CETP mice were fed a high fat (HFD) or a low-fat (LFD) diet for different time periods. Adipose RNA was analyzed by microarrays. We found an increasing number of differentially expressed transcripts during MetS development. In mice with MetS, 1396 transcripts were differentially expressed including transcripts related to immune/inflammatory responses and extracellular matrix enzymes, suggesting significant inflammation and tissue remodeling. The top list of pathways included focal adhesion, chemokine, B and T cell receptor and MAPK signaling. The data identify for the first time adipose gene signatures in apoE3L.CETP mice with diet-induced MetS and might open new avenues for investigation of potential biomarkers or therapeutic targets.
Asunto(s)
Tejido Adiposo Blanco/metabolismo , Síndrome Metabólico/genética , Algoritmos , Animales , Apolipoproteína E3/genética , Proteínas de Transferencia de Ésteres de Colesterol/genética , Dieta Alta en Grasa , Modelos Animales de Enfermedad , Perfilación de la Expresión Génica , Hígado/metabolismo , Redes y Vías Metabólicas/genética , Síndrome Metabólico/etiología , Síndrome Metabólico/metabolismo , Ratones Transgénicos , Análisis de Secuencia por Matrices de Oligonucleótidos , Transducción de SeñalRESUMEN
We examine whether managers' values, attitudes, and perceptions influence the greening of organizations. To that purpose, we specify and test a model of corporate environmental responsiveness (CER), drawing upon a modified version of the theory of planned behavior and the value-belief-norm theory. Based on survey data from 142 Greek companies, we find that top managers' personal values influence responses indirectly, through shaping their environmental attitudes, while direct relationship is not significant. Subjective norms, expressing stakeholder expectations, do affect CER, with their effect being stronger than that of attitudes. Managers' perceived ability to handle environmental issues also appears to influence responses. Results have theoretical implications, indicating the significant role of managers' values, attitudes and perceptions in a firm's environmental response. Practical implications are discussed in relation to selection of managers and training.
Asunto(s)
Actitud , Monitoreo del Ambiente/métodos , Modelos Teóricos , Humanos , Cultura OrganizacionalRESUMEN
Using an in vitro development system for Plasmodium berghei sporogonic stages and microarray technology we examined parasite gene expression during ookinete invasion of Aedes cells and the ensuing oocyst development. A number of genes were found to be differentially expressed. The most prominent class of up-regulated elements corresponded to products involved in protein synthesis and metabolism. Furthermore, several previously studied genes with a known in vivo developmental profile matched published data. A large number of genes with a hitherto unknown function during the life cycle stages studied also show a differential pattern of expression, indicating the involvement of their products in control and execution of active developmental processes.