Where do we aspire to publish? A position paper on scientific communication in biochemistry and molecular biology

The scientific publication landscape is changing quickly, with an enormous increase in options and models. Articles can be published in a complex variety of journals that differ in their presentation format (online-only or in-print), editorial organizations that maintain them (commercial and/or society-based), editorial handling (academic or professional editors), editorial board composition (academic or professional), payment options to cover editorial costs (open access or pay-to-read), indexation, visibility, branding, and other aspects. Additionally, online submissions of non-revised versions of manuscripts prior to seeking publication in a peer-reviewed journal (a practice known as pre-printing) are a growing trend in biological sciences. In this changing landscape, researchers in biochemistry and molecular biology must re-think their priorities in terms of scientific output dissemination. The evaluation processes and institutional funding for scientific publications should also be revised accordingly. This article presents the results of discussions within the Department of Biochemistry, University of São Paulo, on this subject.

Estudo etnofarmacológico em entorno de floresta urbana como subsídio para a implantação da Fitoterapia no Sistema Único de Saúde / Ethnopharmacological study surrounding urban forest as a resource for the implementation of herbal medicine in the National Health System

RESUMO O estudo etnofarmacológico pode ser definido como exploração científica interdisciplinar dos agentes biologicamente ativos, tradicionalmente utilizados por populações humanas e que fazem parte de um acervo de conhecimento compartilhado. Desta forma o presente estudo teve como objetivo o estudo etnofarmacológico de plantas medicinais, no entorno de floresta urbana na Reserva Biológica Poço D’Anta em Juiz de Fora/MG visando a implantação da fitoterapia no Sistema Único de Saúde. Para este, realizou-se levantamento com três diferentes amostras: profissionais de saúde, domicílios em geral e especialistas locais. Quanto aos profissionais de saúde, pôde-se constatar que nenhum entrevistado soube conceituar o termo “Fitoterápico” e que não conheciam as políticas vigentes. Constatou-se que há aceitabilidade da implantação de Fitoterapia na saúde pública, porém, o conhecimento do tema é limitado. A partir das entrevistas nos domicílios em geral e com os especialistas locais, selecionou-se um total de 20 espécies botânicas para análise estatística e confirmação farmacológica. Esses resultados possibilitaram confrontar o conhecimento cultural com científico, com base em 14 espécies que poderiam ser cultivadas em horto na Reserva Biologica Poço D´Anta, com base em suas relevâncias locais. Os resultados obtidos podem subsidiar a aproximação do saber popular em relação ao científico, servindo de base para manutenção e fomento da implantação da Fitoterapia no sistema único de saúde.

ABSTRACT The ethnopharmacological study can be defined as an interdisciplinary scientific exploration of biologically active agents, traditionally used by human populations and part of a shared body of knowledge. Thus, the current study focused on the ethnopharmacological research of medicinal plants, in the surroundings of the urban forest in the Biological Reserve PoçoD’Anta in Juiz de Fora / MG, aiming on the implementation of the herbal medicine in the Public Health System. For this purpose, a survey was held with three different groups: health professionals, members of the community and local experts.Concerning the health professionals, it could be verified that none of the participants were able to explain the term Phytotherapic and neither they had knowledge about the relevant and applicable policies.The acceptability for the implantation of Phytotherapy for public health use was observed, but the knowledge about this subject is limited. From the interviews with members of the community and local experts, a total of 20 plant species were selected for a statistical analysis and pharmacological confirmation. These results made possible to compare the cultural knowledge with the scientific one, defining 14 species that could be grown in the garden of the Biological Reserve Poço D’Anta, based on their local relevance. The results can support the approximation of the popular knowledge with the scientific one, providing a basis for the maintenance and promotion of the Phytotherapy in the Public Health System.

Immunocytochemical and biochemical detection of alpha-L-fucosidase in Trypanosoma cruzi

The aim of the present study was to demonstrate the presence of alpha-L-fucosidase in Trypanosoma cruzi. Immunocytochemical and biochemical techniques were used to localize and characterize a membrane-associated, neutral-pH-optimum, alpha-L-fucosidase from the parasite. Light and electron microscopy localized the alpha-L-fucosidase specifically on the surface of the parasite and on membranes in the posterior region of the epimastigote stage. Although much less intense, labeling was also detected on the surface of trypomastigotes. At least 50 percent of the alpha-L-fucosidase activity was associated with epimastigote membrane solubilized with 1 M NaCl or 1 percent Triton X-100, suggesting that alpha-L-fucosidase is peripherally associated with membranes. The enzyme from epimastigotes had a neutral pH optimum (near 7) but displayed low specific activity when p-nitrophenyl-alpha-L-fucoside was employed as substrate (0.028 U/mg protein for epimastigotes and 0.015 U/mg protein for tissue culture-derived trypomastigotes). Polyacrylamide gel electrophoresis and Western blotting analysis both showed an expected 50-kDa polypeptide which was immunoreactive with anti-alpha-L-fucosidase antibodies

RNA and DNA aptamers as potential tools to prevent cell adhesion in disease

Recent research has shown that receptor-ligand interactions between surfaces of communicating cells are necessary prerequisites for cell proliferation, cell differentiation and immune defense. Cell-adhesion events have also been proposed for pathological conditions such as cancer growth, metastasis, and host-cell invasion by parasites such as Trypanosoma cruzi. RNA and DNA aptamers (aptus = Latin, fit) that have been selected from combinatorial nucleic acid libraries are capable of binding to cell-adhesion receptors leading to a halt in cellular processes induced by outside signals as a consequence of blockage of receptor-ligand interactions. We outline here a novel approach using RNA aptamers that bind to T. cruzi receptors and interrupt host-cell invasion in analogy to existing procedures of blocking selectin adhesion and function in vitro and in vivo

Members of the Tc-85 protein family from Trypanosoma cruzi are adhesion proteins

In recent years, attention has been focused on the characterization of surface proteins from Trypanosoma cruzi in an attempt to understand the invasion mechanism of the parasite. Among the molecules described by different laboratories, we report an 85-KDa glycoprotein specific for the trypomastigote stage (Tc-85) which has been implicated in the invasion of host cells by the parasite. The hypothesis that different members of the Tc-85 protein family are involved in the adhesion of the parasite to the host is discussed.

Turnover and shedding of the Tc-85 surface glycoprotein of Trypanosoma cruzi trypomastigotes

Tc-85 is an 85-kDa surface glycoprotein specific for the trypomastigote stage of Tripanosoma cruzi which has been implicated in the invasion of host cells by the parasite. Tc-85 has a half-life of 3.5-4 h and is synthesized as a 95-kDa precursor. Processing of the 95-kDa precursor is inhibited by N-p-tosyl-L-lysine chloromethyl ketone, p-chloromercuriphenylsulfonic acid, iodoacetamide or N-ethylmaleimide, but not by aprotinin, antipain or phenylmethylsulfonil fluoride. Tc-85, but not the precursor, is rapidly shed into the medium, allowing a correlation between the decrease of Tc-85 in trypomastigotes and its increase in the culture medium. The shedding of Tc-85 was inhibited 50 per cent by 1 muM tunicamycin, but not by 10 muM swainsonine or 10 muM 1-deoxynojirimycin under the experimental conditions employed. This suggests that N-linked oligosaccharides are important for the shedding phenomenon, although it appears that they do not have to be fully processed for shedding to occur.

Trypanosoma cruzi binds to laminin in a carbohydrate-independent way

The bindings of 125I-laminin to trypomastigotes is specific and 2-5 x 10**3 laminin-binding sites were calculated to be presented on the surface of a live trypomastigote. Anti-laminin antibodies were able to inhibit the invasion of cultured cells by trypomastigotes (62-75 per cent), suggesting that laminin may be involved in the adhesion of the parasite to host cells. By affinity chromatography, an 85-KDa glycoprotein was isolated (laminin-bindign glycoprotein, LBG) from trypomastigote lysates, but not from epimastigote lysates. It is suggested that at least fragment E8 (but not E1) from laminin could be involbed in the reaction which is independent of the carbohydrate moieties from both ligand and recepto. It is also shown that LBG is member of the Tc-85 family, previously shown to be related to the invasion process of the parasite