The pollutant diethylhexyl phthalate regulates hepatic energy metabolism via species-specific PPARalpha-dependent mechanisms.

Background: The modulation of energetic homeostasis by pollutants has recently emerged as a potential contributor to the onset of metabolic disorders. Diethylhexyl phthalate (DEHP) is a widely used industrial plasticizer to which humans are widely exposed. Phthalates can activate the three peroxisome proliferatoractivated receptor (PPAR) isotypes on cellular models and induce peroxisome proliferation in rodents.Objectives: In this study, we aimed to evaluate the systemic and metabolic consequences of DEHP exposure that have remained so far unexplored and to characterize the underlying molecular mechanisms of action.Methods: As a proof of concept and mechanism, genetically engineered mouse models of PPARs were exposed to high doses of DEHP, followed by metabolic and molecular analyses.Results: DEHP-treated mice were protected from diet-induced obesity via PPARalpha-dependent activation of hepatic fatty acid catabolism, whereas the activity of neither PPARbeta nor PPARgamma was affected. However, the lean phenotype observed in response to DEHP in wild-type mice was surprisingly abolished in PPARalpha-humanized mice. These species differences are associated with a different pattern of coregulator recruitment.Conclusion: These results demonstrate that DEHP exerts species-specific metabolic actions that rely to a large extent on PPARalpha signaling and highlight the metabolic importance of the species-specific activation of PPARalpha by xenobiotic compounds. Editor's SummaryDiethylhexyl phthalate (DEHP) is an industrial plasticizer used in cosmetics, medical devices, food packaging, and other applications. Evidence that DEHP metabolites can activate peroxisome proliferatoractivated receptors (PPARs) involved in fatty acid oxidation (PPARalpha and PPARbeta) and adiposite function and insulin resistance (PPARgamma) has raised concerns about potential effects of DEHP on metabolic homeostasis. In rodents, PPARalpha activation also induces hepatic peroxisome proliferation, but this response to PPARalpha activation is not observed in humans. Feige et al. (p. 234) evaluated systemic and metabolic consequences of high-dose oral DEHP in combination with a high-fat diet in wild-type mice and genetically engineered mouse PPAR models. The authors report that mice exposed to DEHP gained less weight than controls, without modifying their feeding behavior; they also exhibited lower triglyceride levels, smaller adipocytes, and improved glucose tolerance compared with controls. These effects, which were observed in mice fed both high-fat and standard diets, appeared to be mediated by PPARalpha-dependent activation of hepatic fatty acid catabolism without apparent involvement of PPARbeta or PPARgamma. However, mouse models that expressed human (versus mouse) PPARalpha tended to gain more weight on a high-fat diet than their DHEP-unexposed counterparts. The authors conclude that findings support species-specific metabolic effects of DEHP mediated by PPARalpha activation.

La figura di Nikola Tesla (1856-1943) in Tajna Nikole Tesle (1980)

Nikola Tesla è considerato, dai divulgatori scientifici che di lui si occupano, una figura chiave nella storia della scienza moderna e contemporanea, per l’importanza che hanno avuto le sue ricerche nello sviluppo di tecnologie del XX e XXI secolo. La sua attuale scarsa fama nel piano accademico contrasta con un’abbondante presenza di un Nikola Tesla come personaggio di finzione nelle arti popolari. Questa ricezione ambigua di Tesla potrebbe essere di fatto relazionata con il carattere utopico e visionario delle sue speranze nella scienza come mezzo di conoscenza per il miglioramento della società umana. Questo breve saggio si propone di analizzare come venga presentato il personaggio di Nikola Tesla nel lungometraggio jugoslavo Tajna Nikole Tesle, contribuendo così alla comprensione di come la narrativa di finzione possa sfruttare l’immagine di uno scienziato relativamente agli interessi politici legati a specifici contesti socio-storici.

Un análisis descriptivo de la traducción de los dialectos geográficos y sociales italianos al castellano: el caso de Il cane di terracotta de Andrea Camilleri

El éxito internacional de Andrea Camilleri, escritor siciliano cuyas novelas están caracterizadas por la presencia del dialecto, ha fomentado el debate sobre la posibilidad de traducir textos caracterizados por la presencia de variación lingüística. Esta cuestión ha sido tratada de forma marginal por la traductología y, a menudo, los estudiosos han abogado por la supresión de las marcas dialectales en las traducciones. Un análisis del sistema lingüístico italiano y de su literatura, sin embargo, no puede prescindir del estudio de los dialectos y de las variedades regionales, cuya presencia es todavía muy fuerte. El presente trabajo se centra en un análisis descriptivo, de tipo cualitativo y cuantitativo, de las réplicas de tres personajes de la novela de Camilleri Il cane di terracotta en la versión original y en su traducción al castellano. Este estudio, suportado por la descripción del marco teórico en el que se inscribe el tema de la variación lingüística, nos permite, en primer lugar, evaluar el peso de la presencia de marcas de dialecto geográfico y social en el texto original y trazar la compleja relación existente entre lengua nacional, dialectos y variedades regionales en Italia. En segundo lugar, a través del análisis de la versión en castellano podremos verificar si existe una supresión considerable de las marcas dialectales en la traducción

L'evasione di Pietro e la morte del tiranno. Echi Intertestuali in At 12

(Résumé de l'ouvrage) Una raccolta di studi con cui l'Associazione Biblica Italiana e le EDB intendono onorare la memoria di mons. Fusco, vescovo di Nardò-Gallipoli e illustre biblista. Il volume segue gli ambiti di interesse che hanno caratterizzato la sua ricerca e vede il contributo di insigni studiosi italiani e stranieri.