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2.
Lupus ; 33(7): 716-727, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38616341

RESUMO

OBJECTIVES: We aim to independently assess the validity of the damage index for antiphospholipid syndrome (DIAPS) in thrombotic antiphospholipid syndrome (APS) patients by exploring the prevalence and risk factors of organ damage and evaluating its impact on health-related quality of life (HR-QoL). METHODS: Cross-sectional study including all thrombotic APS patients (Sydney criteria) attending a Portuguese tertiary centre. Damage was assessed using the DIAPS, and HR-QoL using the 3- and 5-level EuroQol HR-QoL (EQ-D5-3L and 5L), and Visual Analogue Scale (VAS) applied via a phone questionnaire. Spearman's correlation between DIAPS and the HR-QoL scales was performed. Risk factors for damage accrual and HR-QoL impairment were explored using univariate and multivariate logistic regression. RESULTS: Among the 108 patients (female, 65.7%; white, 90.7%; primary APS, 75.9%; median disease duration, 6 years), damage (DIAPS≥1) developed in 48.2% of patients (mean ± SD DIAPS, 3.08 ± 1.83). DIAPS's neuropsychiatric domain was the most affected (24.2%), followed by the peripheral vascular domain (20.3%). No clinical, demographic nor laboratory parameters were significantly associated with damage. Regarding HR-QoL, pain/discomfort, anxiety/depression and usual activities domains were the most frequently impaired in both scales. DIAPS's domains correlated similarly with the EQ-5D-3L and 5L scales' individual domains. Female sex, medical disorders, secondary APS and type of presenting thrombosis (arterial) increased the risk of HR-QoL impairment. Total DIAPS was associated with higher odds of mobility, self-care and pain/discomfort impairment in both EQ-5D-3L and 5L scales but lost its independent risk in multivariable analysis. CONCLUSION: This external validation of DIAPS reinforces the ability of the score to correlate with HR-QoL while also highlighting risk factors for HR-QoL impairment other than damage accrual.


Assuntos
Síndrome Antifosfolipídica , Qualidade de Vida , Trombose , Humanos , Síndrome Antifosfolipídica/complicações , Feminino , Masculino , Adulto , Estudos Transversais , Pessoa de Meia-Idade , Fatores de Risco , Trombose/etiologia , Inquéritos e Questionários , Portugal/epidemiologia , Índice de Gravidade de Doença , Modelos Logísticos
3.
Mol Neurobiol ; 2024 Mar 14.
Artigo em Inglês | MEDLINE | ID: mdl-38483655

RESUMO

The aim of this study was to investigate the antiglioma effect of Cecropia pachystachya Trécul (CEC) leaves extract against C6 and U87 glioblastoma (GB) cells and in a rat preclinical GB model. The CEC extract reduced in vitro cell viability and biomass. In vivo, the extract decreased the tumor volume approximately 62%, without inducing systemic toxicity. The deficit in locomotion and memory and an anxiolytic-like behaviors induced in the GB model were minimized by CEC. The extract decreased the levels of reactive oxygen species, nitrites and thiobarbituric acid reactive substances and increased the activity of antioxidant enzymes in platelets, sera and brains of GB animals. The activity of NTPDases, 5'-nucleotidase and adenosine deaminase (ADA) was evaluated in lymphocytes, platelets and serum. In platelets, ATP and AMP hydrolysis was reduced and hydrolysis of ADP and the activity of ADA were increased in the control, while in CEC-treated animals no alteration in the hydrolysis of ADP was detected. In serum, the reduction in ATP hydrolysis was reversed by CEC. In lymphocytes, the increase in the hydrolysis of ATP, ADP and in the activity of ADA observed in GB model was altered by CEC administration. The observed increase in IL-6 and decrease in IL-10 levels in the serum of GB animals was reversed by CEC. These results demonstrate that CEC extract is a potential complementary treatment to GB, decreasing the tumor size, while modulating aspects of redox and purinergic systems.

4.
Sci Total Environ ; 912: 168894, 2024 Feb 20.
Artigo em Inglês | MEDLINE | ID: mdl-38036128

RESUMO

Personal care products (PCPs) are organic compounds that are incorporated in several daily life products, such as shampoos, lotions, perfumes, cleaning products, air fresheners, etc. Due to their massive and continuous use and because they are not routinely monitored in the environment, these compounds are considered emerging contaminants. In fact, residues of PCPs are being discharged into the sewage system, reaching wastewater treatment plants (WWTPs), where most of these compounds are not completely degraded, being partially released into the environment via the final effluents and/or accumulating in the sewage sludges. Environmental sustainability is nowadays one of the main pillars of society and the application of circular economy models, promoting the waste valorisation, is increasingly encouraged. Therefore, irrigation with reclaimed wastewater or soil fertilization with sewage sludge/biosolids are interesting solutions. However, these practices raise concerns due to the potential risks associated to the presence of hazardous compounds, including PCPs. When applied to agricultural soils, PCPs present in these matrices can contaminate the soil or be taken up by crops. Crops can therefore become a route of exposure for humans and pose a risk to public health. However, the extent to which PCPs are taken up and bioaccumulated in crops is highly dependent on the physicochemical properties of the compounds, environmental variables, and the plant species. This issue has attracted the attention of scientists in recent years and the number of publications on this topic has rapidly increased, but a systematic review of these studies is lacking. Therefore, the present paper reviews the uptake, accumulation, and translocation of different classes of PCPs (biocides, parabens, synthetic musks, phthalates, UV-filters) following application of sewage sludge or reclaimed water under field and greenhouse conditions, but also in hydroponic systems. The factors influencing the uptake mechanism in plants were also discussed.


Assuntos
Cosméticos , Esgotos , Humanos , Esgotos/química , Solo , Eliminação de Resíduos Líquidos , Hidroponia
6.
Food Chem Toxicol ; 178: 113901, 2023 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-37330033

RESUMO

Food Contact Materials (FCM) are those intended to be in contact with food, during its production, handling, and storage. FCM contain chemicals that could migrate to the foodstuff, posing potential health concerns, and usage practices influence the level of migration. This study assesses the preferences, safety perceptions, and usage practices of Portuguese consumers regarding FCM used for cooking and food storage (cookware). An observational, quantitative, and transversal study was performed through an online survey created for this purpose, which involved 1179 Portuguese adults. Results were analyzed according to age. Safety was the factor considered most important when choosing cookware materials, although the choice criteria varied with age. The majority of respondents recognize the risk of food contamination through cookware. Stainless steel and glass were considered the safest materials for cooking. The materials most used to reserve food are glass and plastic. Older individuals carry out more maintenance of cookware and have greater knowledge about how to wash and store it. Regarding the FCM symbology, there is a general lack of knowledge. Our study demonstrates the need to disseminate reliable information to the general public about cookware, contributing to greater literacy in health and to less exposure to food contact chemicals.


Assuntos
Culinária , Contaminação de Alimentos , Adulto , Humanos , Culinária/métodos , Contaminação de Alimentos/análise , Utensílios de Alimentação e Culinária , Inocuidade dos Alimentos
7.
Rev Bras Ginecol Obstet ; 45(1): 38-42, 2023 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-36878251

RESUMO

OBJECTIVE: Pain is the primary limitation to performing hysteroscopy. We aimed to evaluate the predictive factors of low tolerance to office hysteroscopic procedures. METHODS: Retrospective cohort study of the patients who underwent office hysteroscopy from January 2018 to December 2020 at a tertiary care center. Pain tolerance to office-based hysteroscopy was subjectively assessed by the operator as terrible, poor, moderate, good, or excellent. Categorical variables were compared with the use of the Chi-squared test; an independent-samples t-test was conducted to compare continuous variables. Logistic regression was performed to determine the main factors associated with low procedure tolerance. RESULTS: A total of 1,418 office hysteroscopies were performed. The mean age of the patients was 53 ± 13.8 years; 50.8% of women were menopausal, 17.8% were nulliparous, and 68.7% had a previous vaginal delivery. A total of 42.6% of women were submitted to an operative hysteroscopy. Tolerance was categorized as terrible or poor in 14.9% of hysteroscopies and moderate, good, or excellent in 85.1%. A terrible or poor tolerance was more frequently reported in menopausal women (18.1% vs. 11.7% in premenopausal women, p = 0.001) and women with no previous vaginal delivery (18.8% vs. 12.9% in women with at least one vaginal birth, p = 0.007). Low tolerance led more often to scheduling a second hysteroscopic procedure under anesthesia (56.4% vs. 17.5% in reasonable-to-excellent tolerance, p < 0.0005). CONCLUSION: Office hysteroscopy was a well-tolerated procedure in our experience, but menopause and lack of previous vaginal delivery were associated with low tolerance. These patients are more likely to benefit from pain relief measures during office hysteroscopy.


Assuntos
Parto Obstétrico , Histeroscopia , Humanos , Feminino , Gravidez , Adulto , Pessoa de Meia-Idade , Idoso , Estudos Retrospectivos , Dor/etiologia
8.
Rev. bras. ginecol. obstet ; 45(1): 38-42, 2023. tab, graf
Artigo em Inglês | LILACS | ID: biblio-1431616

RESUMO

Abstract Objective Pain is the primary limitation to performing hysteroscopy. We aimed to evaluate the predictive factors of low tolerance to office hysteroscopic procedures. Methods Retrospective cohort study of the patients who underwent office hysteroscopy from January 2018 to December 2020 at a tertiary care center. Pain tolerance to office-based hysteroscopy was subjectively assessed by the operator as terrible, poor, moderate, good, or excellent. Categorical variables were compared with the use of the Chi-squared test; an independent-samples t-test was conducted to compare continuous variables. Logistic regression was performed to determine the main factors associated with low procedure tolerance. Results A total of 1,418 office hysteroscopies were performed. The mean age of the patients was 53 ± 13.8 years; 50.8% of women were menopausal, 17.8% were nulliparous, and 68.7% had a previous vaginal delivery. A total of 42.6% of women were submitted to an operative hysteroscopy. Tolerance was categorized as terrible or poor in 14.9% of hysteroscopies and moderate, good, or excellent in 85.1%. A terrible or poor tolerance was more frequently reported in menopausal women (18.1% vs. 11.7% in premenopausal women, p = 0.001) and women with no previous vaginal delivery (18.8% vs. 12.9% in women with at least one vaginal birth, p = 0.007). Low tolerance led more often to scheduling a second hysteroscopic procedure under anesthesia (56.4% vs. 17.5% in reasonable-to-excellent tolerance, p < 0.0005). Conclusion Office hysteroscopy was a well-tolerated procedure in our experience, but menopause and lack of previous vaginal delivery were associated with low tolerance. These patients are more likely to benefit from pain relief measures during office hysteroscopy.


Assuntos
Humanos , Feminino , Pacientes Ambulatoriais , Dor , Histeroscopia , Fatores de Risco
9.
Biology (Basel) ; 13(1)2023 Dec 19.
Artigo em Inglês | MEDLINE | ID: mdl-38275722

RESUMO

Although the discovery of the Golgi apparatus (GA) was made over 125 years ago, only a very limited number of therapeutic approaches have been developed to target this complex organelle. The GA serves as a modification and transport center for proteins and lipids and also has more recently emerged as an important store for some ions. The dysregulation of GA functions is implicated in many cellular processes associated with cancer and some GA proteins are indeed described as cancer biomarkers. This dysregulation can affect protein modification, localization, and secretion, but also cellular metabolism, redox status, extracellular pH, and the extracellular matrix structure. Consequently, it can directly or indirectly affect cancer progression. For these reasons, the GA is an appealing anticancer pharmacological target. Despite this, no anticancer drug specifically targeting the GA has reached the clinic and few have entered the clinical trial stage. Advances in nanodelivery approaches may help change this scenario by specifically targeting tumor cells and/or the GA through passive, active, or physical strategies. This article aims to examine the currently available anticancer GA-targeted drugs and the nanodelivery strategies explored for their administration. The potential benefits and challenges of modulating and specifically targeting the GA function in the context of cancer therapy are discussed.

10.
Chemosphere ; 308(Pt 1): 136314, 2022 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-36067813

RESUMO

Volatile methylsiloxanes (VMSs) are organosilicon compounds, ubiquitous in modern life. Due to their high use in consumer products, large amounts of these compounds are released into sewer systems, reaching wastewater treatment plants (WWTPs). Its frequent detection in sewage sludge can be of concern when considering its land application, not only due to potential negative impacts on the environment, but also on human health. In this work, the effects of sewage sludge application on plant development and crop productivity were studied, as well as VMSs persistence in the soil and their plant uptake. This study focused on 7 VMSs (D3, D4, D5, D6, L3, L4 and L5) and consisted of a 12-week greenhouse pot experiment, where sewage sludge-amended soils were used to cultivate Pisum sativum (peas). Sewage sludge application to soils had no negative effects on plant development and was tied to crop productivity improvements. Most of the VMSs were still present in soils at the end of the experiment and plant uptake and translocation of the 4 cyclic VMSs (D3, D4, D5, D6) occurred. VMSs were detected in plant tissues up to 161 ± 27 ng g-1 dw (samples of stems, leaves and tendrils), but did not exceed 50 ± 19 ng g-1 dw in peas, which did not translate into a human exposure risk due to ingestion, according to an intake risk assessment. However, soil risk assessments showed that for L5 the hazardous ratios were higher than the threshold value of 1. This means a potential environmental risk despite the low levels of this compound in soils (up to 7.3 ± 0.7 ng g-1 dw). Considering these results, sewage sludge monitoring plans should be defined for VMSs, namely when its final destination is land application, thus allowing a safer management of this residue, taking advantage of its valorization potential.


Assuntos
Compostos de Organossilício , Poluentes do Solo , Purificação da Água , Humanos , Esgotos/química , Solo/química , Poluentes do Solo/análise
11.
Coimbra; s.n; set. 2022. 88 p. ilus, tab.
Tese em Português | BDENF - Enfermagem | ID: biblio-1425387

RESUMO

Este trabalho retrata as competências desenvolvidas ao longo do 2º Ano de Mestrado em Enfermagem de Saúde Materna e Obstétrica. Numa primeira parte relatam-se as experiências vivenciadas que promoveram a aquisição das competências regulamentadas para o exercício profissional do enfermeiro especialista em Saúde Materna e Obstétrica. Na segunda parte integra-se um estudo de investigação sobre o cancro do colo do útero. Em Portugal, nas últimas três décadas, a mortalidade por este cancro estabilizou em idades mais avançadas, o que pode ser explicado parcialmente por fatores com impacto na adesão aos programas de rastreio (Ministério da Saúde, 2019). A taxa de cobertura geográfica do rastreio do cancro do colo do útero é de 98,4% a nível nacional. No entanto, na Unidade de Cuidados de Saúde Personalizados (UCSP) de Águeda II, este indicador ficou aquém do anteriormente referido, tendo 40,88% das mulheres contempladas, realizado citologia, em 2019 e 41,73% em 2020. Importa, deste modo, caracterizar a amostra em termos sociodemográficos, sexuais e ginecológicos, identificar conhecimentos sobre o cancro do colo do útero e identificar as crenças em saúde manifestadas por mulheres em relação ao Cancro do Colo do Útero que possam influenciar a vigilância da sua saúde. Desenvolveu-se um estudo de carácter descritivo, exploratório, de nível I. A amostra é constituída por 55 mulheres com idades entre os 25 e os 64 anos, inscritas na UCSP de Águeda II. O instrumento de colheita de dados tem por base um questionário já elaborado e adaptado por Patrão e Leal (2001) para estudos semelhantes. Na Escala de Crenças de Saúde, é possível verificar que a média de resposta nas dimensões ?vulnerabilidade? e ?gravidade? se situam numa crença média, na dimensão ?benefícios? apresentam uma crença elevada, e na dimensão ?obstáculos? apresentam uma baixa crença. Este trabalho vem dar contributos importantes no cuidado da mulher inserida na família e comunidade no âmbito do planeamento familiar e durante o período pré-concecional, onde se insere a implementação de programas de intervenção e de educação para a saúde de forma a promover famílias saudáveis, como descrito no regulamento de competências do EESMO. O seu desenvolvimento vem promover a conceção, o planeamento, a coordenação, a implementação e a avaliação de intervenções de rastreio e de diagnóstico da situação de saúde da mulher ajustadas e coerentes.


Assuntos
Doenças do Colo do Útero , Programas de Rastreamento , Saúde Materna , Modelo de Crenças de Saúde , Enfermagem Obstétrica
12.
Environ Pollut ; 310: 119908, 2022 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-35963392

RESUMO

Sewage sludges are rich in organic matter and several essential nutrients for plant growth, making them very appealing for application in agricultural soils. However, they may also contain a wide range of emerging pollutants, which has raised concerns about the potential risks of this practice to crops, the environment, and public health - accumulation in soils and/or plant uptake and translocation of contaminants. Therefore, there is a need to study plant-soil interactions and assess the uptake potential of these contaminants by food crops to better understand these risks. The main aim of this work was to assess the possible drawbacks of sludge application to cropland, by observing the impact on the growth and yield of a model crop (pea plant - Pisum sativum) grown over an 86-day greenhouse experiment and by assessing the uptake potential of synthetic musk fragrances. Different sewage sludge application rates (4-30-ton ha-1) and initial concentrations of contaminants were tested. The application of sludge yielded benefits to the cultivated plants, finding improved crop productivity with an application rate of 30-ton ha-1. At the end of the experiment, soil samples and plants separated into sections were analysed using a QuEChERS extraction methodology followed by gas chromatography-mass spectrometry (GC-MS) quantification. Galaxolide (HHCB) and tonalide (AHTN) underwent uptake by the plant roots, having been detected in concentrations up to 346 ng g-1 on a dry weight basis (dw), but only HHCB was detected in above ground tissues. At the end, a decrease in the levels of synthetic musks in the amended soils (>80% in several instances) was observed. Assuming the worst-case scenario, no risk to human health was observed from the ingestion of peas grown on sewage sludge-amended soils. However, a soil hazard quotient analysis yielded worryingly high quotient values for AHTN in nearly all tested conditions.


Assuntos
Perfumes , Poluentes do Solo , Ácidos Graxos Monoinsaturados , Humanos , Odorantes , Pisum sativum , Plantas , Receptores Proteína Tirosina Quinases , Receptores Colinérgicos , Esgotos , Solo
13.
Antioxidants (Basel) ; 11(5)2022 May 20.
Artigo em Inglês | MEDLINE | ID: mdl-35624867

RESUMO

Oxidative stress and altered redox signaling have been described in a plethora of pathological conditions, such as inflammation, cardiovascular diseases, diabetes, cancer, and neurodegenerative disorders, among others [...].

14.
Int J Biochem Cell Biol ; 145: 106174, 2022 04.
Artigo em Inglês | MEDLINE | ID: mdl-35182766

RESUMO

Growing evidence connects many of the Golgi known functions with cellular events related to cancer initiation and progression, including regulation of cell survival/death, proliferation, motility, metabolism and immune evasion. However, a broad and integrated understanding of the impact of the Golgi on cancer cell phenotype has not yet been achieved. Multiple cellular events involving the Golgi are associated with protein and lipid modification and trafficking. However, less explored aspects of this enigmatic organelle also contribute to cell fate decision-making by impacting signal transduction, redox and ion homeostasis. This article focuses on the molecular mechanisms and Golgi proteins underlying the impact of the Golgi on cancer cell phenotype. Special emphasis is given to emerging knowledge on redox and ion homeostasis. Current and potential cancer progression therapeutic strategies associated with this organelle will also be addressed.


Assuntos
Complexo de Golgi , Neoplasias , Complexo de Golgi/metabolismo , Homeostase , Humanos , Metabolismo dos Lipídeos , Neoplasias/genética , Neoplasias/metabolismo , Transdução de Sinais
15.
Artigo em Inglês | MEDLINE | ID: mdl-34207624

RESUMO

Attention Deficit Hyperactivity Disorder (ADHD) is raising concerns across health systems, affecting about 5% of the school-age population. Therapy usually involves psychostimulants, which are prone to adverse drug reactions (ADRs). Teachers have many contact hours with children and can easily detect behavioral changes upon the beginning of medication. However, few studies have focused on the role of teachers in the management of ADHD children and detection of ADRs. The present work aimed to characterize the perception of primary school teachers regarding the impact of ADHD therapeutics. A questionnaire was constructed focused on teachers' training regarding ADHD and its therapy; experience with students with ADHD; changes upon beginning of medication; and observation of ADRs. A total of 107 completed questionnaires were obtained. The results indicate that more than 40% of the inquired teachers have received training in ADHD, but in most cases, the theme of therapeutics was absent from that training. The vast majority of teachers (91.6%) have had students with ADHD and observed mood alterations associated with medications. More than 60% of the teachers answered that they are aware of the ADRs and of these, 24% have already detected them in their students. The teachers reported the observed ADRs to parents in 93% of the cases and to doctors in 28% of the cases. In conclusion, the results show the need to reinforce teachers' training in ADHD and its therapeutics.


Assuntos
Transtorno do Deficit de Atenção com Hiperatividade , Transtorno do Deficit de Atenção com Hiperatividade/tratamento farmacológico , Criança , Conhecimentos, Atitudes e Prática em Saúde , Humanos , Percepção , Professores Escolares , Instituições Acadêmicas
16.
Clin Case Rep ; 9(5): e04001, 2021 May.
Artigo em Inglês | MEDLINE | ID: mdl-34026130

RESUMO

Leydig cell tumors are rare ovarian neoplasms. Affected individuals typically present with amenorrhea/oligomenorrhea and rapidly progressive features of virilization. Erythrocytosis can also occur as a result of high testosterone levels.

17.
Molecules ; 25(18)2020 Sep 16.
Artigo em Inglês | MEDLINE | ID: mdl-32947912

RESUMO

The antimicrobial evaluation of twelve natural and hemisynthetic isopimarane diterpenes are reported. The compounds were evaluated against a panel of Gram-positive bacteria, including two methicillin-resistant Staphylococcus aureus (MRSA) strains and one vancomycin-resistant Enterococcus (VRE) strain. Only natural compounds 7,15-isopimaradien-19-ol (1) and 19-acetoxy-7,15-isopimaradien-3ß-ol (6) showed promising results. Isopimarane (1) was the most active, showing MIC values between 6.76 µM against S. aureus (ATCC 43866) and 216.62 µM against E. faecalis (FFHB 427483) and E. flavescens (ATCC 49996). Compound (6) showed moderated activity against all tested microorganisms (MIC between value 22.54 and 45.07 µM). These compounds were found to be active against the methicillin-sensitive strains of S. aureus (CIP 106760 and FFHB 29593), showing MIC values of 13.55 (1) and 22.54 (6) µM. Both compounds were also active against vancomycin-resistant E. faecalis (ATCC 51299) (MIC values of 54.14 and 45.07 µM, respectively). In addition, the cytotoxicity of nine compounds 7,15-isopimaradien-3ß,19-diol (2); mixture: 15-isopimarene-8ß-isobutyryloxy-19-ol and 15-isopimarene-8ß-butyryloxy-19-ol (3); 3ß-acetoxy-7,15-isopimaradiene-19-ol (5); 19-acetoxy-7,15-isopimaradiene-3ß-ol (6); 3ß,19-diacetoxy-7,15-isopimaradiene (8); 15-isopimarene-8ß,19-diol (9); 19-O-ß-d-glucopyranoside-7,15-isopimaradiene (10); lagascatriol-16-O-ß-d-glucopyranoside (11) and lagascatriol-16-O-α-d-mannopyranoside (12) was evaluated in the human breast cancer cell line MDA-MB-231. Isopimarane (2) was the only compound showing some cytotoxicity. The IC50 value of compound (2) was 15 µM, suggesting a mild antiproliferative activity against these breast cancer cells.


Assuntos
Abietanos/química , Anti-Infecciosos/química , Diterpenos/química , Anti-Infecciosos/farmacologia , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Diterpenos/farmacologia , Enterococcus faecalis/efeitos dos fármacos , Bactérias Gram-Positivas/efeitos dos fármacos , Humanos , Staphylococcus aureus Resistente à Meticilina/efeitos dos fármacos , Testes de Sensibilidade Microbiana , Relação Estrutura-Atividade , Resistência a Vancomicina/efeitos dos fármacos
18.
Artigo em Inglês | MEDLINE | ID: mdl-32537664

RESUMO

Ants are excellent navigators using multimodal information for navigation. To accurately localise the nest at the end of a foraging journey, visual cues, wind direction and also olfactory cues need to be learnt. Learning walks are performed at the start of an ant's foraging career or when the appearance of the nest surrounding has changed. We investigated here whether the structure of such learning walks in the desert ant Cataglyphis fortis takes into account wind direction in conjunction with the learning of new visual information. Ants learnt to travel back and forth between their nest and a feeder, and we then introduced a black cylinder near their nest to induce learning walks in regular foragers. By doing this across days with different wind directions, we were able to probe how ants balance different sensory modalities. We found that (1) the ants' outwards headings are influenced by the wind direction with their routes deflected such that they will arrive downwind of their target, (2) a novel object along the route induces learning walks in experienced ants and (3) the structure of learning walks is shaped by the wind direction rather than the position of the visual cue.


Assuntos
Formigas/fisiologia , Comportamento de Retorno ao Território Vital/fisiologia , Animais , Sinais (Psicologia) , Clima Desértico , Comportamento Exploratório/fisiologia , Aprendizagem/fisiologia , Orientação/fisiologia , Navegação Espacial/fisiologia , Caminhada , Vento
19.
Biomolecules ; 10(1)2020 01 19.
Artigo em Inglês | MEDLINE | ID: mdl-31963771

RESUMO

Medicinal plants are important sources of new bioactive compounds with potential anticancer activity. Parvifloron D (ParvD) is an abietane diterpenoid, isolated in high amounts from Plectranthus ecklonii Benth. Previous reports have suggested potential therapeutic properties for ParvD. ParvD has shown pro-apoptotic and cytotoxic effects in leukemia and melanoma cell lines. However, to the best of our knowledge, there are no studies in triple-negative breast cancer (TNBC) models. TNBC is a breast cancer subtype characterized by an aggressive behavior with poor clinical outcomes and weak overall therapeutic responses to the current treatment options. This work aimed at evaluating the anticancer effect of ParvD in MDA-MB-231 cells, a model of human TNBC. To obtain sufficient amounts of purified ParvD the efficiency of several extraction methods was compared. ParvD (0.1-10 µM) decreased cell viability in a concentration-dependent manner. Treatment with ParvD (5 µM) significantly increased the percentage of apoptotic nuclei and exposure to 3 µM ParvD increased the sub-G1 population. Since altered cell adherence, migration, and invasion are determinant processes for the formation of metastases, the effect of ParvD on these cellular processes was tested. Although treatment with ParvD (1 µM) had no effect on cell-substrate attachment, ParvD (1 µM) significantly reduced cell chemotaxis and invasion. This is the first report describing the proapoptotic effect of ParvD in TNBC cells. Moreover, for the first time we have shown that ParvD reduces cell motility, unraveling potential anti-metastatic properties.


Assuntos
Abietanos/farmacologia , Antineoplásicos Fitogênicos/farmacologia , Apoptose/efeitos dos fármacos , Movimento Celular/efeitos dos fármacos , Neoplasias de Mama Triplo Negativas/tratamento farmacológico , Abietanos/isolamento & purificação , Antineoplásicos Fitogênicos/isolamento & purificação , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Feminino , Humanos , Plectranthus/química , Neoplasias de Mama Triplo Negativas/metabolismo , Neoplasias de Mama Triplo Negativas/patologia
20.
Biomolecules ; 10(1)2019 12 20.
Artigo em Inglês | MEDLINE | ID: mdl-31877674

RESUMO

Ximenia (Ximeniaamericana L.) is a shrub, or small tree, native from Africa and spread across different continents. In Angola, the seeds oil is used by local populations, to prevent sunburn, to smooth and hydrate the skin, and to give it a pleasant color and elasticity, to prevent stretch marks, in pregnant woman, and also as hair conditioner. Herein, an oil sold in the region (LPO), and two others extracted in laboratory, from seeds collected in the same region, were investigated in terms of their composition, chemical properties, UV transmission. The three oils are similar although the LPO is more acidic, 0.48 mg KOH/g. GC-MS analysis indicated that the major components are the fatty acids, oleic (31.82%), nervonic (11.09%), ximenic (10.22%), and hexacosa-17,20,23-trienoic acids (14.59%). Long chain fatty acids, n ≥ 20, accounted for 51.1% of the total fatty acids. A thin film of the oil showed a reduction in transmittance from 200 to 300 nm. Viscosity studies of the LPO indicated that at normal temperature of skin, the oil can be spread over the skin as a thin film. At concentrations up to 10 µg/mL, the LPO is not toxic to human keratinocytes, suggesting the safety of this oil.


Assuntos
Cosméticos/análise , Olacaceae/química , Óleos de Plantas/química , Angola , Ácidos Graxos/química , Ácidos Graxos/farmacologia , Humanos , Queratinócitos/citologia , Queratinócitos/efeitos dos fármacos , Óleos de Plantas/farmacologia , Sementes/química
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