Retinol Metabolism in the Mollusk Osilinus lineatus Indicates an Ancient Origin for Retinyl Ester Storage Capacity

Although retinoids have been reported to be present and active in vertebrates and invertebrates, the presence of mechanisms for retinoid storage in the form of retinyl esters, a key feature to maintain whole-organism retinoid homeostasis, have been considered to date a vertebrate innovation. Here we demonstrate for the first time the presence of retinol and retinyl esters in an invertebrate lophotrochozoan species, the gastropod mollusk Osilinus lineatus. Furthermore, through a pharmacological approach consisting of intramuscular injections of different retinoid precursors, we also demonstrate that the retinol esterification pathway is active in vivo in this species. Interestingly, retinol and retinyl esters were only detected in males, suggesting a gender-specific role for these compounds in the testis. Females, although lacking detectable levels of retinol or retinyl esters, also have the biochemical capacity to esterify retinol, but at a lower rate than males. The occurrence of retinyl ester storage capacity, together with the presence in males and females of active retinoids, i.e., retinoic acid isomers, indicates that O. lineatus has a well developed retinoid system. Hence, the present data strongly suggest that the capacity to maintain retinoid homeostasis has arisen earlier in Bilateria evolution than previously thought

Psychometric performance of the brazilian version of the Mini-cuestionario de calidad de vida en la hipertensión arterial (MINICHAL)

This study aimed to evaluate the feasibility, acceptability, ceiling and floor effects, reliability, and convergent construct validity of the Brazilian version of the Mini Cuestionario de Calidad de Vida en la Hipertensión Arterial (MINICHAL). The study included 200 hypertensive outpatients in a university hospital and a primary healthcare unit. The MINICHAL was applied in 3.0 (± 1.0) minutes with 100% of the items answered. A "ceiling effect" was observed in both dimensions and in the total score, as well as evidence of measurement stability (ICC=0.74). The convergent validity was confirmed by significant positive correlations between similar dimensions of the MINICHAL and the SF-36, and significant negative correlations with the Minnesota Living with Heart Failure Questionnaire - MLHFQ, however, correlations between dissimilar constructs were also observed. It was concluded that the Brazilian version of the MINICHAL presents evidence of reliability and validity when applied to hypertensive outpatientsEste estudio tuvo como objetivo evaluar la practicidad, la aceptabilidad, los efectos techo y suelo, la confiabilidad y la validez de constructo convergente de la versión brasileña del Minicuestionario de Calidad de Vida de la Hipertensión Arterial - MINICHAL. Participaron del estudio 200 pacientes hipertensos en seguimiento en ambulatorio, en hospital universitario y en Unidad Básica de Salud. El MINICHAL fue aplicado en 3,0 (±1,0) minutos, con 100% de los ítems respondidos. Fue observado "efecto techo" en ambas dimensiones y puntaje total, así como evidencias de estabilidad de la medida (CCI=0,74). La validez convergente fue confirmada por correlaciones significativas positivas entre dimensiones similares del MINICHAL y del SF-36, y por correlaciones significativas negativas con el Minnesota Living with Heart Failure Questionnaire - MLHFQ, a pesar de que correlaciones entre constructos no similares hubiesen sido observadas. Se concluye que la versión brasileña del MINICHAL presenta evidencia de confiabilidad y validez cuando aplicada en hipertensos en seguimiento en ambulatorio.Este estudo teve como objetivo avaliar a praticabilidade, a aceitabilidade, os efeitos teto e chão, a confiabilidade e a validade de constructo convergente da versão brasileira do mini - cuestionario de calidad de vida en la hipertensión arterial - Minichal. Participaram do estudo 200 pacientes hipertensos, em seguimento ambulatorial, em hospital universitário e unidade básica de saúde. O Minichal foi aplicado em 3,0 (±1,0) minutos, com 100% dos itens respondidos. Foi observado efeito teto em ambas as dimensões e escore total, bem como evidências de estabilidade da medida (ICC=0,74). A validade convergente foi confirmada por correlações significativas positivas entre dimensões similares do Minichal e do SF-36, e por correlações significativas negativas com o Minnesota Living with Heart Failure Questionnaire - MLHFQ, embora correlações entre constructos dissimilares tenham sido observadas. Conclui-se que a versão brasileira do Minichal apresenta evidência de confiabilidade e validade, quando aplicada em hipertensos, em seguimento ambulatorial

Small molecule inhibits α-synuclein aggregation, disrupts amyloid fibrils, and prevents degeneration of dopaminergic neurons

Parkinson''s disease (PD) is characterized by a progressive loss of dopaminergic neurons, a process that current therapeutic approaches cannot prevent. In PD, the typical pathological hallmark is the accumulation of intracellular protein inclusions, known as Lewy bodies and Lewy neurites, which are mainly composed of alpha-synuclein. Here, we exploited a high-throughput screening methodology to identify a small molecule (SynuClean-D) able to inhibit alpha-synuclein aggregation. SynuClean-D significantly reduces the in vitro aggregation of wildtype alpha-synuclein and the familiar A30P and H50Q variants in a substoichiometric molar ratio. This compound prevents fibril propagation in protein-misfolding cyclic amplification assays and decreases the number of alpha-synuclein inclusions in human neuroglioma cells. Computational analysis suggests that SynuClean-D can bind to cavities in mature alpha-synuclein fibrils and, indeed, it displays a strong fibril disaggregation activity. The treatment with SynuClean-D of two PD Caenorhabditis elegans models, expressing alpha-synuclein either in muscle or in dopaminergic neurons, significantly reduces the toxicity exerted by alpha- synuclein. SynuClean-D-treated worms show decreased alpha-synuclein aggregation in muscle and a concomitant motility recovery. More importantly, this compound is able to rescue dopaminergic neurons from alpha-synuclein-induced degeneration. Overall, SynuClean-D appears to be a promising molecule for therapeutic intervention in Parkinson's disease

Possible role of Epoxyeicosatrienoic acid in prevention of oxidative stress mediated neuroinflammation in Parkinson disorders

Parkinson’s disease (PD) is a multifactorial neurodegenerative disease involving oxidative stress, neuroinflammation and apoptosis. Epoxyeicosatrienoic acids (EETs) are arachidonic acid metabolites and they play a role in cytoprotection by modulating various cell signaling pathways. This cytoprotective role of EETs are well established in cerebral stroke, cardiac failure, and hypertension, and it is due to their ability to attenuate oxidative stress, endoplasmic reticulum stress, inflammation, caspase activation and apoptosis. The actions of EETs in brain closely parallel the effects which is observed in the peripheral tissues. Since many of these effects could potentially contribute to neuroprotection, EETs are, therefore, one of the potential therapeutic candidates in PD. Therefore, by increasing the half life of endogenous EETs in vivo via inhibition of sEH, its metabolizing enzyme can, therefore, constitutes an important therapeutic strategy in PD

Comparative study of representations of professional autonomy produced by first and last-period undergraduate nursing students

ABSTRACT Objective: to compare the social representations of professional nurse autonomy produced by first and last-period undergraduate nursing students. Method: qualitative, descriptive and exploratory study, based on the structural approach of social representations, the Central Core Theory, carried out with 171 students from three federal public universities, using the free association technique on the object “professional nurse autonomy”. The data were submitted to EVOC 2005 software and to similarity analysis. Results: care was the central core of the representational structure identified among the students of the first period. Among last-period students, knowledge stood out as a core element. The term responsibility was identified as common to both central cores. Conclusion: regarding professional autonomy, the results point to an overlapping process of the reified and consensual universes during the undergraduate course. However, responsibility, inherent in the profession, remains cross-sectional. For the first period students, autonomy is resignified in a practical and attitudinal way, whereas for the last period students, the knowledge acquired stimulates them to assign meaning to professional autonomy with a cognitive and attitudinal representation. The data can support the use of innovative teaching practices in nursing undergraduate courses