Fasciola hepatica:the effect of the microtubule inhibitors colchicine and tubulozole-C on the ultrastructure of the adult fluke

The effect of the microtubule inhibitors colchicine (1 x 10(-3) M) and tubulozole-C(1 x 10(-6) M) on the ultrastructure of adult Fasciola hepatica has been determined in vitro by transmission electron microscopy (TEM), using both intact flukes and tissue-slice material. With colchicine treatment, the apical membrane of the tegument became increasingly convoluted and blebbed, while accumulations of T1 secretory bodies occurred in the basal region of the syncytium, leading to progressively fewer secretory bodies in the syncytium. In the tegumental cells there were distinct accumulations of T1 secretory bodies around the Golgi complexes, which remained active for up to 12 h incubation. Tubulozole-treated flukes showed more severe effects, with initial accumulations of secretory bodies, both at the tegumental apex and base. This was followed in the later time-periods by the sloughing of the tegumental syncytium. In the underlying tegumental cells, the granular endoplasmic reticulum (GER) cisternae were swollen and disrupted, becoming concentrated around the nucleus. The Golgi complexes were dispersed to the periphery of the cells and gradually disappeared from the cytoplasm. After treatment with both drugs, the cell population in the vitelline follicles was altered, with an abnormally large proportion of stem cells and relatively few intermediate type 1 cells. The nurse cell cytoplasm became fragmented and was no longer in contact with the vitelline cells, while the shell globule clusters within the intermediate type 2 and mature cells were loosely packed. In the mature vitelline cells, 'yolk' globules and glycogen deposits became fewer than normal and lipid droplets were observed. The results are discussed in relation to the different modes of action of the two drugs and potential significance of this to anthelmintic (benzimidazole) therapy.

The letters of Lowndes, addressed to the Hon. John C. Calhoun

This document contains an address to John C. Calhoun about various points that they disagree on and why.

Identification of a Novel Recycling Sequence in the C-tail of FPR2/ALX Receptor: Association with Cell Protection from Apoptosis

Formyl-peptide receptor type 2 (FPR2; also called ALX because it is the receptor for lipoxin A4) sustains a variety of biological responses relevant to the development and control of inflammation, yet the cellular regulation of this G-protein-coupled receptor remains unexplored. Here we report that, in response to peptide agonist activation, FPR2/ALX undergoes β-arrestin-mediated endocytosis followed by rapid recycling to the plasma membrane. We identify a transplantable recycling sequence that is both necessary and sufficient for efficient receptor recycling. Furthermore, removal of this C-terminal recycling sequence alters the endocytic fate of FPR2/ALX and evokes pro-apoptotic effects in response to agonist activation. This study demonstrates the importance of endocytic recycling in the anti-apoptotic properties of FPR2/ALX and identifies the molecular determinant required for modulation of this process fundamental for the control of inflammation.

Trabalho colaborativo entre professores para integração curricular no 1º ciclo do ensino básico: um contributo para melhoria das planifica��ões pedagógicas em S.Tomé e Príncipe

Dissertação apresentada à Escola Superior de Educa��ão de Lisboa para obtenção do grau de mestre em Didáticas Integradas em Língua Portuguesa, Matemática, Ciências Naturais e Sociais

500 cm3, Naas sur A.B.C. [critérium motocycliste de l'A.A.M.M., Association des anciens motocyclistes militaires à Auxerre, le 24 mai 1920] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59359

« Oeuvres sacrez de J. B. C. », à savoir.

Contient : 1 « Job ou de la fermeté,.VI. livres », traduction en vers du livre de Job ; 2 « Version des cantiques de l'Eglise » ; 3 « Le Symbole d'ATHANASE » ; 4 « Hymne de S. S. AMBROISE et AUGUSTIN » ; 5 « Le Cantique des cantiques, ou Les amours de Salomon et de Sulamite, avec l'allegorie des amours de Jesu Christ et de l'Eglise » ; 6 « Version du psaume 137, Super flumina Babylonis »

26-8-20, circuit de la Sarthe, Borgotti sur A.B.C. : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 60720