Exploring the Therapeutic Potential of Extracellular Vesicles Derived from Human Immature Dental Pulp Cells on Papillary Thyroid Cancer.

Mesenchymal stem-cell-derived extracellular vesicles (MSC-EVs) have been increasingly investigated for cancer therapy and drug delivery, and they offer an advanced cell-free therapeutic option. However, their overall effects and efficacy depend on various factors, including the MSC source and cargo content. In this study, we isolated EVs from the conditioned medium of human immature dental pulp stem cells (hIDPSC-EVs) and investigated their effects on two papillary thyroid cancer (PTC) cell lines (BCPAP and TPC1). We observed efficient uptake of hIDPSC-EVs by both PTC cell lines, with a notable impact on gene regulation, particularly in the Wnt signaling pathway in BCPAP cells. However, no significant effects on cell proliferation were observed. Conversely, hIDPSC-EVs significantly reduced the invasive capacity of both PTC cell lines after 120 h of treatment. These in vitro findings suggest the therapeutic potential of hIDPSC-EVs in cancer management and emphasize the need for further research to develop novel and effective treatment strategies. Furthermore, the successful internalization of hIDPSC-EVs by PTC cell lines underscores their potential use as nanocarriers for anti-cancer agents.

Agreement Between Maximal Lactate Steady State and Critical Power in Different Sports: A Systematic Review and Bayesian's Meta-Regression.

ABSTRACT: Borszcz, FK, de Aguiar, RA, Costa, VP, Denadai, BS, and de Lucas, RD. Agreement between maximal lactate steady state and critical power in different sports: A systematic review and Bayesian's meta-regression. J Strength Cond Res 38(6): e320-e339, 2024-This study aimed to systematically review the literature and perform a meta-regression to determine the level of agreement between maximal lactate steady state (MLSS) and critical power (CP). Considered eligible to include were peer-reviewed and "gray literature" studies in English, Spanish, and Portuguese languages in cyclical exercises. The last search was made on March 24, 2022, on PubMed, ScienceDirect, SciELO, and Google Scholar. The study's quality was evaluated using 4 criteria adapted from the COSMIN tool. The level of agreement was examined by 2 separate meta-regressions modeled under Bayesian's methods, the first for the mean differences and the second for the SD of differences. The searches yielded 455 studies, of which 36 studies were included. Quality scale revealed detailed methods and small samples used and that some studies lacked inclusion/exclusion criteria reporting. For MLSS and CP comparison, likely (i.e., coefficients with high probabilities) covariates that change the mean difference were the MLSS time frame and delta criteria of blood lactate concentration, MLSS number and duration of pauses, CP longest predictive trial duration, CP type of predictive trials, CP model fitting parameters, and exercise modality. Covariates for SD of the differences were the subject's maximal oxygen uptake, CP's longest predictive trial duration, and exercise modality. Traditional MLSS protocol and CP from 2- to 15-minute trials do not reflect equivalent exercise intensity levels; the proximity between MLSS and CP measures can differ depending on test design, and both MLSS and CP have inherent limitations. Therefore, comparisons between them should always consider these aspects.

Is the 5-Minute Time-Trial Cycling Test a Valid Predictor of Maximal Oxygen Uptake? An External Cross-Validation Study.

PURPOSE: This study aimed to cross-validate a recently proposed equation for the prediction of maximal oxygen uptake (V˙O2max) in cycling exercise by using the average power output normalized by the body mass from a 5-minute time trial (RPO5-min) as the independent variable. Further, the study aimed to update the predictive equation using Bayesian informative prior distributions and meta-analysis. METHODS: On different days, 49 male cyclists performed an incremental graded exercise test until exhaustion and a 5-minute time trial on a stationary cycle ergometer. We compared the actual V˙O2max with the predicted value obtained from the RPO5-min, using a modified Bayesian Bland-Altman agreement analysis. In addition, this study updated the data on the linear regression between V˙O2max and RPO5-min, by incorporating information from a previous study as a Bayesian informative prior distribution or via meta-analysis. RESULTS: On average, the predicted V˙O2max using RPO5-min underestimated the actual V˙O2max by -6.6 mL·kg-1·min-1 (95% credible interval, -8.6 to -4.7 mL·kg-1·min-1). The lower and upper 95% limits of agreement were -17.2 (-22.7 to -12.3) and 3.8 (-1.0 to 9.5) mL·kg-1·min-1, respectively. When the current study's data were analyzed using the previously published data as a Bayesian informative prior distribution, the accuracy of predicting sample means was found to be better when compared with the data combined via meta-analyses. CONCLUSIONS: The proposed equation presented systematic bias in our sample, in which the prediction underestimated the actual V˙O2max. We provide an updated equation using the previous one as the prior distribution, which could be generalized to a greater audience of cyclists.

Identifying Roadkill Hotspots for Mammals in the Brazilian Atlantic Forest using a Functional Group Approach.

A critical step to design wildlife mitigating measures is the identification of roadkill hotspots. However, the effectiveness of mitigations based on roadkill hotspots depends on whether spatial aggregations are recurrent over time, spatially restricted, and most importantly, shared by species with diverse ecological and functional characteristics. We used a functional group approach to map roadkill hotspots for mammalian species along the BR-101/North RJ, a major road crossing important remnants of the Brazilian Atlantic Forest. We tested if functional groups present distinct hotspot patterns, and if they converge into the same road sectors, in that case, favoring optimal mitigating actions. Roadkill rates were monitored and recorded between October/2014 and September/2018 and species were classified into six functional groups based on their home range, body size, locomotion mode, diet, and forest-dependency. Hotspots along the roads were mapped for comparison of spatial patterns between functional groups. Results demonstrated that the roadkill index varied idiosyncratically for each functional group throughout the months and that no group presented seasonality. Seven hotspots were shared by two or more functional groups, highlighting the importance of these road stretches to regional mammal fauna. Two of the stretches are associated with aquatic areas extending from one side of the road to the other, and the remaining are connected to patches of native vegetation on both sides. This work brings a promising approach, yet hardly used in ecological studies on roads to analyze roadkill dynamics, assigning more importance to ecological instead of taxonomical characteristics, normally used to identify spatiotemporal patterns.

Exploring the therapeutic potential of extracellular vesicles derived from human immature dental pulp cells on papillary thyroid cancer

Mesenchymal stem-cell-derived extracellular vesicles (MSC-EVs) have been increasingly investigated for cancer therapy and drug delivery, and they offer an advanced cell-free therapeutic option. However, their overall effects and efficacy depend on various factors, including the MSC source and cargo content. In this study, we isolated EVs from the conditioned medium of human immature dental pulp stem cells (hIDPSC-EVs) and investigated their effects on two papillary thyroid cancer (PTC) cell lines (BCPAP and TPC1). We observed efficient uptake of hIDPSC-EVs by both PTC cell lines, with a notable impact on gene regulation, particularly in the Wnt signaling pathway in BCPAP cells. However, no significant effects on cell proliferation were observed. Conversely, hIDPSC-EVs significantly reduced the invasive capacity of both PTC cell lines after 120 h of treatment. These in vitro findings suggest the therapeutic potential of hIDPSC-EVs in cancer management and emphasize the need for further research to develop novel and effective treatment strategies. Furthermore, the successful internalization of hIDPSC-EVs by PTC cell lines underscores their potential use as nanocarriers for anti-cancer agents.

Exosomes as a Nano-Carrier for Chemotherapeutics: A New Era of Oncology.

Despite the considerable advancements in oncology, cancer remains one of the leading causes of death worldwide. Drug resistance mechanisms acquired by cancer cells and inefficient drug delivery limit the therapeutic efficacy of available chemotherapeutics drugs. However, studies have demonstrated that nano-drug carriers (NDCs) can overcome these limitations. In this sense, exosomes emerge as potential candidates for NDCs. This is because exosomes have better organotropism, homing capacity, cellular uptake, and cargo release ability than synthetic NDCs. In addition, exosomes can serve as NDCs for both hydrophilic and hydrophobic chemotherapeutic drugs. Thus, this review aimed to summarize the latest advances in cell-free therapy, describing how the exosomes can contribute to each step of the carcinogenesis process and discussing how these nanosized vesicles could be explored as nano-drug carriers for chemotherapeutics.

A experiência esportiva no programa Curumim do Sesc Ribeirão Preto: descobertas, aprendizados e influências / The sports experience in the Curumim program of Sesc Ribeirão Preto: discoveries, learnings and inlfuences / La experiencia deportiva en el programa Curumim del Sesc Ribeirão Preto: descubrimientos, aprendizajes y influencias

Este artigo buscou compreender como a prática esportiva vivenciada no programa Curumim influenciou a relação dos antigos participantes do programa no Sesc Ribeirão Preto com o esporte. Como metodologia, utilizamos a Teoria Fundamentada; seis adultos que participaram do Curumim foram entrevistados. Durante a análise, cinco categorias foram estabelecidas, sendo a principal "Curumim como 'uma janela que se abre': descobertas, aprendizados e influências". Por fim, foi possível evidenciar a influência do Curumim no envolvimento com a prática esportiva. Contudo, este não foi um fator decisivo. Ainda, experiências marcantes demonstraram potencial para alterar o modo de ação de seus frequentadores e definir a escolha profissional dos participantes.

This article sought to understand how the sports practice experienced in the Curumim Program influenced the relationship of the former participants with sport. As methodology, the Grounded Theory was used; six adults who participated in the Curumim in Sesc Ribeirão Preto were interviwed. Analyzing the data, five categories were established and the main one was "Curumim as 'an open window': discoveries, learning and influences". Finally, it was possible to perceive the influence of Curumim in sports practice, however, this was not a decisive factor. Still, remarkable experiences showed the potential to change the way of action of its participants and to define the professional choice.

Este artículo buscó comprender cómo la práctica deportiva vivida en el Programa Curumim influyó en la relación de los ex participantes del Sesc Ribeirão Preto con el deporte. Como metodología, se utilizó la Teoría Fundamentada; se entrevistaron seis adultos que participaron en el Curumim. En el análisis, se establecieron cinco categorías, siendo la principal "Curumim como una 'ventana que se abre': descubrimientos, aprendizajes e influencias". Finalmente, se pudo evidenciar la influencia de Curumim en la práctica deportiva, pero, este no fue un factor determinante. Todavía, experiencias notables demostraron el potencial para cambiar las acciones de sus habituales y definir su elección profesional.

A experiência esportiva no programa Curumim do Sesc Ribeirão Preto: descobertas, aprendizados e influências / The sports experience in the Curumim program of Sesc Ribeirão Preto: discoveries, learnings and inlfuences / La experiencia deportiva en el programa Curumim del Sesc Ribeirão Preto: descubrimientos, aprendizajes y influencias

Este artigo buscou compreender como a prática esportiva vivenciada no programa Curumim influenciou a relação dos antigos participantes do programa no Sesc Ribeirão Preto com o esporte. Como metodologia, utilizamos a Teoria Fundamentada; seis adultos que participaram do Curumim foram entrevistados. Durante a análise, cinco categorias foram estabelecidas, sendo a principal "Curumim como 'uma janela que se abre': descobertas, aprendizados e influências". Por fim, foi possível evidenciar a influência do Curumim no envolvimento com a prática esportiva. Contudo, este não foi um fator decisivo. Ainda, experiências marcantes demonstraram potencial para alterar o modo de ação de seus frequentadores e definir a escolha profissional dos participantes (AU).

This article sought to understand how the sports practice experienced in the Curumim Program influenced the relationship of the former participants with sport. As methodology, the Grounded Theory was used; six adults who participated in the Curumim in Sesc Ribeirão Preto were interviwed. Analyzing the data, five categories were established and the main one was "Curumim as 'an open window': discoveries, learning and influences". Finally, it was possible to perceive the influence of Curumim in sports practice, however, this was not a decisive factor. Still, remarkable experiences showed the potential to change the way of action of its participants and to define the professional choice (AU).

Este artículo buscó comprender cómo la práctica deportiva vivida en el Programa Curumim influyó en la relación de los ex participantes del Sesc Ribeirão Preto con el deporte. Como metodología, se utilizó la Teoría Fundamentada; se entrevistaron seis adultos que participaron en el Curumim. En el análisis, se establecieron cinco categorías, siendo la principal "Curumim como una 'ventana que se abre': descubrimientos, aprendizajes e influencias". Finalmente, se pudo evidenciar la influencia de Curumim en la práctica deportiva, pero, este no fue un factor determinante. Todavía, experiencias notables demostraron el potencial para cambiar las acciones de sus habituales y definir su elección profesional (AU).

Percepção de risco e comportamentos de proteção face à covid-19 em estudantes do ensino superior: o papel mediador do medo / Percepción del riesgo y conductas protectoras frente al covid-19 en estudiantes de enseñanza superior: el papel mediador del miedo / Risk Perception and Protective Behaviors Against covid-19 in Higher Education Students: The Mediating Role of Fea

O estudo tem como objetivo descrever os comportamentos de proteção adotados por estudantes portugue-ses do ensino superior durante a pandemia e analisar a sua relação com a percepção de risco e o papel mediador do medo face à covid-19. Participaram 335 estu-dantes com idades entre os 18 e os 29 anos (m= 21.42; dp= 2.43). Os participantes preencheram um inquérito sobre os comportamentos de proteção (i.e., preventi-vos e de evitamento), a percepção de risco e o medo face à covid-19. Os resultados demonstraram que os comportamentos preventivos mais utilizados foram a lavagem/desinfecção das mãos ao longo do dia e o uso de máscara na via pública ou espaços exteriores. Os comportamentos de evitamento mais adotados foram o de evitar locais com aglomeração e os convívios presenciais com colegas/amigos. Verificouse uma as-sociação positiva entre os comportamentos de proteção, a percepção de gravidade e o medo face à covid-19. O medo face à covid-19 foi mediador da relação entre a percepção de gravidade e os comportamentos preventivos (c' = .26, ic 95% [.11; .44]) e de evitamento (c' = .28, ic 95% [.12; .50]). Os resultados são discutidos aten-dendo ao papel da percepção de risco e do medo nas respostas comportamentais dos jovens, num contexto de pandemia, sendo apresentadas implicações práticas e sugestões para estudos futuros.

El estudio tiene como objetivo describir las conductas protectoras adoptadas por los estudiantes portugueses de educación superior durante la pandemia, y analizar su relación con la percepción de riesgo y el papel mediador del miedo al covid-19. Participaron en el estudio 335 estudiantes de entre 18 y 29 años (m = 21.42; ds = 2.43). Los participantes completaron una encuesta sobre conductas protectoras (es decir, preventivas y de evitación), percepción de riesgo y miedo al covid-19. Los resultados mostraron que las conductas preventivas más utilizadas fueron el lavado/desinfección de manos a lo largo del día y el uso de mascarilla en la vía pública o al aire libre. Los comportamientos de evitación más adoptados fueron evadir lugares con reuniones e interacciones cara a cara con compañeros/amigos. Hubo una correlación positiva entre las conductas protectoras, la percepción de seriedad y el miedo al covid-19. También se encontró que el miedo al covid-19 medió la relación entre la percepción de severidad y las conductas preventivas (c' = .26, ic 95% [.11; .44]) y de evitación (c' = .28, ic 95% [.12; .50]). Los resultados se discuten considerando el papel de la percepción del riesgo y el miedo en las respuestas conductuales de los jóvenes en un contexto pandémico, así mismo se presentan impli-caciones prácticas y sugerencias para estudios futuros.

The study aims to describe the protective behaviors adopted by Portuguese higher education students in during the and to analyze their relationship with the perception of risk and the mediating role of fear of covid-19. A total of 335 students aged be-tween 18 and 29 participated in the study (m= 21.42; sd = 2.43). Participants completed a survey on protective (i.e., preventive and avoidance) behaviors, risk perception, and fear of covid-19. The results showed that the most used preventive behaviors were hand washing/disinfection throughout the day and using masks in public streets or outdoor spaces. The most adopted avoidance behaviors were avoiding crowded places and face-to-face interactions with colleagues/friends. There was a positive correlation between pro-tective behaviors, the perception of severity, and fear of covid-19. Fear of covid-19 mediated the relation between the perception of severity and both preventive (c' = .26, ic 95% [.11; .44]) and avoidance (c' = .28, ic95% [.12; .50]) behaviors. The results are discussed considering the role of risk perception and fear in the behavioral responses of young people in a pandemic context while presenting practical implications and suggestions for future studies.

Definition of the Region of Interest for the Assessment of Alveolar Bone Repair Using Micro-computed Tomography.

The objective of this study was to evaluate the influence of the extraction socket (distal or lingual root) and the type of region of interest (ROI) definition (manual or predefined) on the assessment of alveolar repair following tooth extraction using micro-computed tomography (micro-CT). The software package used for scanning, reconstruction, reorientation, and analysis of images (NRecon®, DataViewer®, CT-Analyzer®) was acquired through Bruker < https://www.bruker.com > . The sample comprised the micro-CT volumes of seven Wistar rat mandibles, in which the right first molar was extracted. The reconstructed images were analyzed using the extraction sockets, i.e., the distal and intermediate lingual root and the method of ROI definition: manual (MA), central round (CR), and peripheral round (PR). The bone volume fraction (BV/TV) values obtained were analyzed by two-way ANOVA with Tukey's post hoc test (α = 5%). The distal extraction socket resulted in significantly lower BV/TV values than the intermediate lingual socket for MA (P = 0.001), CR (P < 0.001), and PR (P < 0.001). Regarding the ROI, when evaluating the distal extraction socket, the BV/TV was significantly higher (P < 0.001) for MA than for CR and PR, with a lower BV/TV for CR. However, no significant difference was observed for MA (P = 0.855), CR (P = 0.769), or PR (P = 0.453) in the intermediate lingual extraction socket. The bone neoformation outcome (BV/TV) for alveolar bone repair after tooth extraction is significantly influenced by the ROI and the extraction socket. Using the predefined method with a standardized ROI in the central region of the distal extraction socket resulted in the assessment of bone volume, demonstrating the most critical region of the bone neoformation process.

Exosomes as a nano-carrier for Chemotherapeutics: a new era of oncology

Despite the considerable advancements in oncology, cancer remains one of the leading causes of death worldwide. Drug resistance mechanisms acquired by cancer cells and inefficient drug delivery limit the therapeutic efficacy of available chemotherapeutics drugs. However, studies have demonstrated that nano-drug carriers (NDCs) can overcome these limitations. In this sense, exosomes emerge as potential candidates for NDCs. This is because exosomes have better organotropism, homing capacity, cellular uptake, and cargo release ability than synthetic NDCs. In addition, exosomes can serve as NDCs for both hydrophilic and hydrophobic chemotherapeutic drugs. Thus, this review aimed to summarize the latest advances in cell-free therapy, describing how the exosomes can contribute to each step of the carcinogenesis process and discussing how these nanosized vesicles could be explored as nano-drug carriers for chemotherapeutics.

Outcome Measure Epidemiological of Female Inmates in West Amazon, Brazil / Medida Epidemiológica de Mulheres Reclusas na Amazônia Ocidental, Brasil

Introduction: the prison system in the Brazilian state of Acre, located in the Western region of the Amazon, is a branch of the criminal justice system that has been suffering from issues such as overcrowding and growth in internal organized crime. The prevalence of these matters directly affects the resocialization of prisoners and inhibits the successful re-engineering of their social values and beliefs.Objective: to analyze the epidemiological profile of jailed women in the State of Acre, Brazil.Methods: in a cross-sectional descriptive study, 129 participants were recruited from female penitentiaries in the state of Acre. Conducted between August and December of 2017, data was collected through a validated questionnaire, divided into modules, using both open and closed-ended items.Results: we found that most women who participated in the study were single (n = 86, 66.7%), had brown skin (n = 93, 72.1%), had children (n=102, 79.1%), resided in the state of Acre (n=117, 90.5%). The mean age of the sample was 27.69 years. Among those participants who reported having partners (n = 40, 31%), we found that half had partners who were also incarcerated (n = 20, 50%). The study results also indicate that drug trafficking (n = 86, 66.7%) was the major cause for female incarceration, followed by homicide crime (n = 16, 12.4%). Over half of the participants were in prison for the first time (n = 75, 58.1%), with a high recidivism rate observed in the total sample (n = 54, 41.9%). A majority of the participants (n = 97, 75.2%) kept in touch with members of their families and a smaller portion (n = 15, 11.6%) received conjugal visits. With regard to social activities, slightly more than half (n = 75, 58.1%) worked and the majority (n = 114, 88.4%) did not study while jailed.Conclusion: the difficulties associated with accessing inmate data and the lack of peer-reviewed studies on inmate health in Brazil suggests that the public policies recommended by the PNSSP and the National Policy for Comprehensive Health Care for Women should be reevaluated.

Introdução: o sistema prisional no estado brasileiro do Acre, localizado na região ocidental da Amazônia, é um ramo do sistema de justiça criminal que tem sofrido por situações como a superlotação e o crescimento do crime organizado interno. A prevalência destas questões afeta diretamente a ressocialização dos prisioneiros e inibe a preservação bem sucedida dos seus valores e crenças sociais.Objetivo: analisar o perfil epidemiológico das mulheres encarceradas no Estado do Acre, Brasil.Método: Estudo descritivo transversal, sendo que 129 participantes foram recrutadas em penitenciárias femininas no Estado do Acre. Conduzidos entre agosto e dezembro de 2017, os dados foram recolhidos através de um questionário validado, dividido em módulos, utilizando tanto artigos abertos como fechados.Resultados: verificamos que a maioria das mulheres que participaram no estudo eram solteiras (n = 86, 66,7%), tinham pele castanha (n = 93, 72,1%), tinham filhos (n = 102, 79,1%), residiam no estado do Acre (n = 117, 90,5%). A idade média da amostra foi de 27,69 anos. Entre os participantes que declararam ter parceiros (n = 40, 31%), descobrimos que metade tinha parceiros que também estavam encarcerados (n = 20, 50%). Os resultados do estudo indicam também que o tráfico de drogas (n = 86, 66,7%) foi a principal causa de encarceramento feminino, seguido do crime de homicídio (n = 16, 12,4%). Mais de metade dos participantes estiveram na prisão pela primeira vez (n = 75, 58,1%), com uma elevada taxa de reincidência observada na amostra total (n = 54, 41,9%). A maioria dos participantes (n = 97, 75,2%) manteve-se em contato com membros das suas famílias e uma parte menor (n = 15, 11,6%) recebeu visitas conjugais. No que respeita às atividades sociais, pouco mais de metade (n = 75, 58,1%) trabalhou e a maioria (n = 114, 88,4%) não estudou enquanto esteve presa.Conclusão: as dificuldades associadas ao acesso aos dados dos presos e a falta de estudos revistos por pares sobre a saúde dos presos no Brasil sugerem que as políticas públicas recomendadas pelo Plano Nacional de Saúde no Sistema Penitenciário - PNSSP e a Política Nacional de Atenção Integral à Saúde da Mulher - PNAISM devem ser reavaliadas.

Functional Threshold Power Estimated from a 20-minute Time-trial Test is Warm-up-dependent.

This study investigated the influence of different warm-up protocols on functional threshold power. Twenty-one trained cyclists (˙VO2max=60.2±6.8 ml·kg-1·min-1) performed an incremental test and four 20-min time trials preceded by different warm-up protocols. Two warm-up protocols lasted 45 min, with a 5-min time trial performed either 15 min (Traditional) or 25 min (Reverse) before the 20-min time trial. The other two warm-up protocols lasted 25 min (High Revolutions-per minute) and 10 min (Self-selected), including three fast accelerations and self-selected intensity, respectively. The power outputs achieved during the 20-min time trial preceded by the Traditional and Reverse warm-up protocols were significantly lower than the High Revolutions-per-minute and Self-selected protocols (256±30; 257±30; 270±30; 270±30 W, respectively). Participants chose a conservative pacing strategy at the onset (negative) for the Traditional and Reverse but implemented a fast-start strategy (U-shaped) for the High revolutions-per-minute and Self-selected warm-up protocols. In conclusion, 20-min time-trial performance and pacing are affected by different warm-ups. Consequently, the resultant functional threshold power may be different depending on whether the original protocol with a 5-min time trial is followed or not.

Clusters of SARS-CoV-2 Lineage B.1.1.7 Infection after Vaccination with Adenovirus-Vectored and Inactivated Vaccines.

A SARS-CoV-2 B.1.1.7 variant of concern (VOC) has been associated with increased transmissibility, hospitalization, and mortality. This study aimed to explore the factors associated with B.1.1.7 VOC infection in the context of vaccination. On March 2021, we detected SARS-CoV-2 RNA in nasopharyngeal samples from 14 of 22 individuals vaccinated with a single-dose of ChAdOx1 (outbreak A, n = 26), and 22 of 42 of individuals with two doses of the CoronaVac vaccine (outbreak B, n = 52) for breakthrough infection rates for ChAdOx1 of 63.6% and 52.4% for CoronaVac. The outbreaks were caused by two independent clusters of the B.1.1.7 VOC. The serum of PCR-positive symptomatic SARS-CoV-2-infected individuals had ~1.8-3.4-fold more neutralizing capacity against B.1.1.7 compared to the serum of asymptomatic individuals. These data based on exploratory analysis suggest that the B.1.1.7 variant can infect individuals partially immunized with a single dose of an adenovirus-vectored vaccine or fully immunized with two doses of an inactivated vaccine, although the vaccines were able to reduce the risk of severe disease and death caused by this VOC, even in the elderly.

Oil Spill Sorber Based on Extrinsically Magnetizable Porous Geopolymer.

Environmental impacts are increasingly due to the human polluting activities. Therefore, there is a need to develop technologies capable of removing contamination and driving the impacted environment as close as possible to its inherent characteristics. One of the major problems still faced is the spill of oil into water. Therefore, to solve the environmental problem, this work shows the use of magnetically modified geopolymer materials as an oil remover from water with a magnet's aid. The results obtained were outstanding since the average intrinsic oil removal capability (IORC) was 150 g/g. The presented IORC is the largest found in the materials produced by our research group, constituting an extremely encouraging result, mainly because of the ease of preparing the magnetic geopolymer system. Furthermore, the low cost of production and the material's capability to be reused as filler of polymer or even cementitious matrices allows us to project that this nanocomposite can be widely used, constituting an economically viable alternative for more efficient environmental recovery processes.

Exosomes in the Tumor Microenvironment: From Biology to Clinical Applications.

Cancer is one of the most important health problems and the second leading cause of death worldwide. Despite the advances in oncology, cancer heterogeneity remains challenging to therapeutics. This is because the exosome-mediated crosstalk between cancer and non-cancer cells within the tumor microenvironment (TME) contributes to the acquisition of all hallmarks of cancer and leads to the formation of cancer stem cells (CSCs), which exhibit resistance to a range of anticancer drugs. Thus, this review aims to summarize the role of TME-derived exosomes in cancer biology and explore the clinical potential of mesenchymal stem-cell-derived exosomes as a cancer treatment, discussing future prospects of cell-free therapy for cancer treatment and challenges to be overcome.

Low SARS-CoV-2 seroprevalence in a cohort of Brazilian sickle cell disease patients: Possible effects of emphasis on social isolation for a population initially considered to be at very high risk.

Despite being initially considered at higher risk for severe COVID-19, sickle cell disease (SCD) patients have mostly presented clinical severity similar to the general population. As their vulnerability to become infected remains uncertain, we assessed the seroreactivity for SARS-CoV-2 to estimate the prevalence of infection and possible phenotypic and socioeconomic determinants for their contagion. Serologic evaluation was performed on 135 patients with an overall prevalence of 11%; positivity was associated with older age and use of public transportation. We speculate that social distancing instructions recommended by our clinic may have contributed to lower levels of infection, but potential protection factors need further investigation.

Conhecimentos e práticas de esporte de estudantes do ensino médio das regionais do estado do Acre / Sports knowledge and practices of high school students in the regions of the state of Acre

Este estudo visa descrever os conhecimentos e práticas de esporte de estudantes do ensino médio. A problematização baseia-se em como estão sendo percebidas essas práticas e os conhecimentos esportivos dos estudantes das instituições federais do Acre. É um estudo transversal do tipo descritivo e exploratório, com utilização de questionário estruturado, validado por um painel de especialistas. Os respondentes do estudo foram 674 estudantes. Os resultados apontam que os participantes reconhecem a importância do esporte para a melhoria de vários aspectos de sua vida, no entanto, uma grande parcela não realiza atividades esportivas nos horários de folga. O principal motivo referenciado para não praticar esporte fora da escola foi a falta de tempo. Entre os que praticam esporte no tempo livre, os motivos foram a melhora no desempenho físico e ser um hábito saudável, e as modalidades mais praticadas são o futebol e o futsal.

This study aims to describe the knowledge and sports practices of high school students. The problematization is based on how these practices and the sports knowledge of students from federal institutions in Acre are being perceived. It is a cross-sectional study of a descriptive and exploratory type, using a structured questionnaire, validated by a panel of experts. Study respondents were 674 students. The results show that the participants recognize the importance of sport for the improvement of various aspects of their lives, however, a large portion does not perform sports activities during their free time. The main reason cited for not playing sports outside school was the lack of time. Among those who practice sports in their free time, the reasons were the improvement in physical performance and being a healthy habit, and the most practiced modalities are football and futsal.

Breast cancer in Brazil: Screening program and surgical approach.

BACKGROUND: Screening mammography for breast cancer (BC) is a current strategy that reduces the mortality of BC by up to 30 %. Although mastectomy has been an important component of treatment for decades, conservative surgery (lumpectomy) has become the gold-standard approach for most cases, yet it depends on early detection of the BC. METHODS: This was an epidemiological study performed through DATASUS (2010-2018). We evaluated the temporal trend of screening mammograms, deaths from BC, and surgical procedures at national, regional and state levels. Statistical analysis was performed on VassarStat®-Website for Statistical Computation (Vassar College, New York, USA) and the R-software (R Foundation, v.4.0.3). RESULTS: During 2010-2018 there were 67,392 oncological mastectomies and 48,567 lumpectomies in Brazil's health system. Mastectomies decreased in the Northeast (-3.67 % ± 0.43 per year) and in Bahia state (-3.58 % ± 0.24 per year). Lumpectomies increased in Brazil (median 2.19 (-9.6 to 20.96)), the Northeast (median -12.07 (-25.8 to 9.43)) and Bahia (median 0.16 (-29.1 to 1.9)). Also, screening mammograms increased in Brazil (3.29 % ± 0.43), the Northeast (6.36 % ± 0.49) and Bahia (5.51 % ± 0.31), with 35,317,728 exams during this period. Deaths from BC increased annually in Brazil (+4.13 % ± 0.86), the Northeast (+4.76 % ± 1.45) and Bahia (+5.65 % ± 0.83). CONCLUSION: The number of mammograms related to the screening program increased in the years 2010-2018 in Brazil. Furthermore, we identified an increase in lumpectomies as opposed to mastectomies, and this approach is associated with a reduction in hospitalization days by almost a half, which in turn might result in a cost decrease and probably an earlier return to work.

Neutralisation of SARS-CoV-2 lineage P.1 by antibodies elicited through natural SARS-CoV-2 infection or vaccination with an inactivated SARS-CoV-2 vaccine: an immunological study.

BACKGROUND: Mutations accrued by SARS-CoV-2 lineage P.1-first detected in Brazil in early January, 2021-include amino acid changes in the receptor-binding domain of the viral spike protein that also are reported in other variants of concern, including B.1.1.7 and B.1.351. We aimed to investigate whether isolates of wild-type P.1 lineage SARS-CoV-2 can escape from neutralising antibodies generated by a polyclonal immune response. METHODS: We did an immunological study to assess the neutralising effects of antibodies on lineage P.1 and lineage B isolates of SARS-CoV-2, using plasma samples from patients previously infected with or vaccinated against SARS-CoV-2. Two specimens (P.1/28 and P.1/30) containing SARS-CoV-2 lineage P.1 (as confirmed by viral genome sequencing) were obtained from nasopharyngeal and bronchoalveolar lavage samples collected from patients in Manaus, Brazil, and compared against an isolate of SARS-CoV-2 lineage B (SARS.CoV2/SP02.2020) recovered from a patient in Brazil in February, 2020. Isolates were incubated with plasma samples from 21 blood donors who had previously had COVID-19 and from a total of 53 recipients of the chemically inactivated SARS-CoV-2 vaccine CoronaVac: 18 individuals after receipt of a single dose and an additional 20 individuals (38 in total) after receipt of two doses (collected 17-38 days after the most recent dose); and 15 individuals who received two doses during the phase 3 trial of the vaccine (collected 134-230 days after the second dose). Antibody neutralisation of P.1/28, P.1/30, and B isolates by plasma samples were compared in terms of median virus neutralisation titre (VNT50, defined as the reciprocal value of the sample dilution that showed 50% protection against cytopathic effects). FINDINGS: In terms of VNT50, plasma from individuals previously infected with SARS-CoV-2 had an 8·6 times lower neutralising capacity against the P.1 isolates (median VNT50 30 [IQR <20-45] for P.1/28 and 30 [<20-40] for P.1/30) than against the lineage B isolate (260 [160-400]), with a binominal model showing significant reductions in lineage P.1 isolates compared with the lineage B isolate (p≤0·0001). Efficient neutralisation of P.1 isolates was not seen with plasma samples collected from individuals vaccinated with a first dose of CoronaVac 20-23 days earlier (VNT50s below the limit of detection [<20] for most plasma samples), a second dose 17-38 days earlier (median VNT50 24 [IQR <20-25] for P.1/28 and 28 [<20-25] for P.1/30), or a second dose 134-260 days earlier (all VNT50s below limit of detection). Median VNT50s against the lineage B isolate were 20 (IQR 20-30) after a first dose of CoronaVac 20-23 days earlier, 75 (<20-263) after a second dose 17-38 days earlier, and 20 (<20-30) after a second dose 134-260 days earlier. In plasma collected 17-38 days after a second dose of CoronaVac, neutralising capacity against both P.1 isolates was significantly decreased (p=0·0051 for P.1/28 and p=0·0336 for P.1/30) compared with that against the lineage B isolate. All data were corroborated by results obtained through plaque reduction neutralisation tests. INTERPRETATION: SARS-CoV-2 lineage P.1 might escape neutralisation by antibodies generated in response to polyclonal stimulation against previously circulating variants of SARS-CoV-2. Continuous genomic surveillance of SARS-CoV-2 combined with antibody neutralisation assays could help to guide national immunisation programmes. FUNDING: São Paulo Research Foundation, Brazilian Ministry of Science, Technology and Innovation and Funding Authority for Studies, Medical Research Council, National Council for Scientific and Technological Development, National Institutes of Health. TRANSLATION: For the Portuguese translation of the abstract see Supplementary Materials section.