Search results for "caproni"

Development and pathology of echinostoma caproni in experimentally infected mice

2007

In the present article, several parasitological features of mice, each experimentally infected with 75 metacercariae of Echinostoma caproni (Trematoda: Echinostomatidae), were studied during the first 12 wk postinfection. Moreover, the early pathological responses also were analyzed and compared with data previously published on other host species of E. caproni to gain further insight into the factors determining worm rejection or establishment of chronic infections. The results obtained show that the pattern of E. caproni infection in mice is consistent with a highly compatible host–parasite system. This combination is characterized by a high worm establishment, high egg output, and long s…

Differential alterations in the small intestine epithelial cell turnover during acute and chronic infection with Echinostoma caproni (Trematoda)

2015

Background The intestinal epithelium plays a multifactorial role in mucosal defense. In this sense, augmented epithelial cell turnover appears as a potential effector mechanism for the rejection of intestinal-dwelling helminths. Methods A BrdU pulse-chase experiment was conducted to investigate the infection-induced alterations on epithelial cell kinetics in hosts of high (mouse) and low (rat) compatibility with the intestinal trematode Echinostoma caproni. Results High levels of crypt-cell proliferation and tissue hyperplasia were observed in the ileum of infected mice, coinciding with the establishment of chronic infections. In contrast, the cell migration rate was about two times higher …

Identification of antigenic proteins from Echinostoma caproni (Trematoda) recognized by mouse immunoglobulins M, A and G using an immunoproteomic app…

2008

Antigenic proteins of Echinostoma caproni (Trematoda) against mouse IgM, IgA, IgG, IgG1 and IgG2a were investigated by immunoproteomics. Excretory/secretory products (ESP) of E. caproni separated by two-dimensional (2D) gel electrophoresis were transferred to nitrocellulose membranes and probed with the different mouse immunoglobulin classes. A total of four proteins (enolase, 70 kDa heat-shock protein (HSP-70), actin and aldolase) were accurately identified. Enolase was recognized in eight different spots of which seven of them were detected in the expected molecular weight and were recognized by IgA, IgG or IgG and IgG1. Another spot identified as enolase at 72 kDa was only recognized by …

Screening trematodes for novel intervention targets: a proteomic and immunological comparison of Schistosoma haematobium, Schistosoma bovis and Echin…

2011

SUMMARYWith the current paucity of vaccine targets for parasitic diseases, particularly those in childhood, the aim of this study was to compare protein expression and immune cross-reactivity between the trematodes Schistosoma haematobium, S. bovis and Echinostoma caproni in the hope of identifying novel intervention targets. Native adult parasite proteins were separated by 2-dimensional gel electrophoresis and identified through electrospray ionisation tandem mass spectrometry to produce a reference gel. Proteins from differential gel electrophoresis analyses of the three parasite proteomes were compared and screened against sera from hamsters infected with S. haematobium and E. caproni fo…

Kinetics of echinostoma caproni (trematoda: echinostomatidae) antigens in feces and serum of experimentally infected hamsters and rats

2004

This study reports on the kinetics of antibody production to Echinostoma caproni and the dynamics of antigens in feces and sera in 2 experimental hosts (hamsters and rats) that display different degrees of susceptibility with this echinostome. Echinostoma caproniproduced chronic infections in hamsters, whereas rats lost the infection at 49-56 days postinfection (DPI). Hamsters developed higher antibody responses than rats, probably in relation to different intestinal absorptions of worm antigens in each host species. The levels of coproantigens were indicative of the course of infection in each host. Positive coproantigen levels were detected at 1-2 DPI in both hosts, and the values remaine…

Echinostoma caproni: Differential tegumental responses to growth in compatible and less compatible hosts

2010

Abstract The topography of the tegument of Echinostoma caproni adults collected from high (mice) and low (rats) compatible hosts was compared by SEM. In the oral (OS) and the ventral sucker (VS) areas, a worm age–host species interaction was found with regard to the density of spines. There was a decrease in the density of spines in the adults collected from mice, whereas an increase occurred in the OS area in worms from rats over time. The tegumentary spines in adults from mice became larger and blunter. Some spines from the VS area in adults from mice at 4 wpi were multipointed. The spines of adults from rats were sharper, not covered by the tegument and no multipointed spines were observ…

Análisis de la interacciones parásito-hospedador en el modelo Echinostoma caproni-roedor, con énfasis en los factores que determinan el curso de la i…

2015

En la presente Tesis Doctoral se analizan diferentes parámetros implicados en las relaciones parásito-hospedador en helmintiasis intestinales mediante la utilización del modelo experimental Echinostoma caproni-roedor. Con esta finalidad se estudian diversos aspectos inmunológicos, además de las alteraciones intestinales inducidas por la infección en dos sistemas parásito-hospedador: E. caproni-ratón y E. caproni-rata. Los resultados obtenidos ponen de manifiesto que el IFN-γ y el óxido nítrico son mediadores fundamentales en el desarrollo de infecciones crónicas en ratón, induciendo disfunción mitocondrial en las células del epitelio intestinal e hiperplasia tisular. No obstante, se sugiere…

Definitive host influences the proteomic profile of excretory/secretory products of the trematode Echinostoma caproni

2016

Background Echinostoma caproni is an intestinal trematode extensively used as experimental model for the study of factors that determine the course of intestinal helminth infections, since this markedly depends on the host species. Although the host-dependent mechanisms for either chronic establishment or early parasite rejection have been broadly studied, little is known regarding the parasite response against different host environments. Methods To identify host-dependent differentially expressed proteins, a comparative proteomic analysis of the excretory/secretory products released from E. caproni adults, isolated from hosts displaying different compatibility with this trematode, was per…

L'inquieto diletto della caccia in Caproni. Metamorfosi di un mito.

2013

Il tragico senza catarsi: compagno segreto dei poeti del Novecento

2014

The progressive decline of tragedy, as a literary genre, linked to the downfall of a philosophical framework of absolute values (both religious and not), activated a deep reflection about the origin and meaning of tragic. The collapse of the so-called “grande stile” produced expressive forms that rethought the agonistic tension, typical of the tragedy, towards an aesthetic of distance, away from the present, from Leopardi to Pasolini. This paper argues that, through 20th century, poetry has actually borne the functions of tragic, with a new significance. As an outsider, the poet develops critical gaze and negative thinking; he uses a metaphorical, non-mimetical language, able to challenge t…