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1.
Food Chem ; 439: 138146, 2024 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-38100869

RESUMO

Active packaging made from biodegradable polymers and natural additives appears as an ecological alternative. In addition to having antioxidant activity and enhancing food preservation, it allows mitigating the negative impacts caused by improper disposal. This study pursued to produce biodegradable films based on a polymer blend PBAT/PLA (Ecovio®) using the flat extrusion method. The films were prepared with the incorporation of 5 wt% of powdered turmeric or cinnamon as natural additives. The films obtained, and those reprocessed twice, were characterized in terms of colorimetric, UV light transmittance, water contact angle, water vapor permeability, morphology, mechanical properties, and antioxidant activity. Cinnamon reduced the UV light transmittance and made a surface more hydrophobic. Reprocessing led to greater elongation and maximum load, associated with increased dispersion and distribution, as evidenced in the morphological analysis. The films developed have significant potential for applications in active food packaging, with emphasis on cinnamon-additivated films.


Assuntos
Cinnamomum , Embalagem de Alimentos , Embalagem de Alimentos/métodos , Poliésteres/química , Curcuma , Pós , Antioxidantes/química , Polímeros/química , Cinnamomum zeylanicum/química
2.
Antibiotics (Basel) ; 12(8)2023 Aug 18.
Artigo em Inglês | MEDLINE | ID: mdl-37627751

RESUMO

Biotransformations are reactions mediated by microorganisms, such as fungi. These bioreactions have high chemo- and stereoselectivity on organic substrates and can be applied in the search for new bioactive compounds. In this study, acanthoic acid (AA) was biotransformed using the fungus Xylaria sp., giving the novel compound 3ß,7ß-dihydroxyacanthoic acid (S1). Both the AA and the product S1 were tested against Gram-positive and Gram-negative bacteria. To identify and validate possible biological targets as enzymes or proteins involved in the activity observed in vitro, we used the molecular docking method. Hydroxylation at the C-3 and C-7 positions of the biotransformation product enhanced its activity against Escherichia coli as well as its binding affinity and interactions with superoxide dismutase 1 (SOD1; PDB ID 4A7G). Based on our results, the SOD1 enzyme was suggested to be a possible target for the antioxidant activity of product S1.

3.
ACS Chem Neurosci ; 14(3): 389-399, 2023 02 01.
Artigo em Inglês | MEDLINE | ID: mdl-36634245

RESUMO

The increase in proinflammatory cytokine expression causes behavioral changes consistent with sickness behavior, and this led to the suggestion that depression might be a psychoneuroimmunological phenomenon. Here, we evaluated the effects of the pretreatment with fluoxetine (10 mg/kg, i.p.) and curcumin (0.5 mg/kg, i.p.) on the immune response elicited by the inoculation of an Aeromonas hydrophila bacterin in zebrafish. Non-pretreated but A. hydrophila-inoculated and sham-inoculated groups of fish served as controls. The social preference, locomotor, exploratory activities, and cerebral expression of il1b, il6, tnfa, and bdnf mRNA were compared among the groups. Behavioral changes characteristic of sickness behavior and a significant increase in the expression of il1b and il6 cytokines were found in fish from the immunostimulated group. The behavioral alterations caused by the inflammatory process were different between males and females, which was coincident with the increased expression of cerebral BDNF. Fluoxetine and curcumin prevented the sickness behavior induced by A. hydrophila and the increased expression of proinflammatory cytokines. Our results point to the potential of zebrafish as a translational model in studies related to neuroinflammation and demonstrate for the first time the effects of fluoxetine and curcumin on zebrafish sickness behavior.


Assuntos
Curcumina , Fluoxetina , Masculino , Animais , Feminino , Fluoxetina/farmacologia , Citocinas/metabolismo , Peixe-Zebra/metabolismo , Curcumina/farmacologia , Fator Neurotrófico Derivado do Encéfalo , Interação Social , Interleucina-6
4.
J Manipulative Physiol Ther ; 45(2): 97-103, 2022 02.
Artigo em Inglês | MEDLINE | ID: mdl-35753870

RESUMO

OBJECTIVE: The purpose of this study was to investigate whether photobiomodulation (PBM) can protect against and attenuate muscle atrophy owing to complete peripheral nerve lesion in mice by acting on autophagy. METHODS: C57BL/10 mice underwent right sciatic nerve transection to induce tibialis anterior muscle atrophy. After 6 hours of denervation, the mice received PBM (wavelength, 830 nm) daily, transcutaneously over the tibialis anterior muscle region for 5 or 14 days. Some mice with sciatic nerve lesion did not receive PBM. Mice that did not have sciatic nerve lesion and PBM were used as controls. After 5 and 14 days, the right tibialis anterior muscle was examined using histomorphometric (cross-sectional area of muscle fibers), Western blot (levels of the autophagy marker LC3), and immunofluorescence analyses (number of LC3 puncta in the muscle fibers). RESULTS: The cross-sectional area of the tibialis anterior muscle fibers decreased after 5 and 14 days of denervation. PBM protected against muscle fiber atrophy after 5 days of denervation and attenuated muscle fiber atrophy after 14 days of denervation. After 5 days of muscle denervation, autophagy did not change, as demonstrated by the comparable levels of LC3-I/II ratio and LC3 puncta between the controls and the mice with atrophic muscle; PBM did not change this profile. After 14 days of denervation, an increased LC3-I/II ratio suggested an ongoing autophagy, which was not affected by PBM. CONCLUSION: PBM attenuated the tibialis anterior muscle atrophy induced by sciatic nerve transection in the mice after at least 5 and 14 days of muscle denervation, without affecting autophagy. The transient protective effect of PBM was observed as early as 5 days after the of complete nerve lesion.


Assuntos
Atrofia Muscular , Neuropatia Ciática , Animais , Autofagia , Camundongos , Camundongos Endogâmicos C57BL , Denervação Muscular , Músculo Esquelético/inervação , Atrofia Muscular/patologia
5.
Cureus ; 14(12): e32594, 2022 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-36654594

RESUMO

Phytobezoars are a well-documented cause of small bowel obstruction. Previous reports include patients who have predisposing factors such as gastric surgery, diabetes mellitus, or poor dentition. Consequences of extreme dieting have also been reported, but a resultant phytobezoar and life-threatening bowel obstruction are rare. We present a case of phytobezoar solely due to a diet inordinately high in fiber.

6.
Phys Med ; 87: 90-98, 2021 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-34130221

RESUMO

PURPOSE: Mammography is the diagnostic imaging practice used in screening to detect early lesions suspected of malignancy. It uses a low energy X-ray beam in which a low dose in the order of 2-3 mGy is delivered to patient breast cells. However, it has been speculated that it could lead to significant cell damage, when compared to conventional X-ray. We investigated the biological effects of low doses, with mean glandular doses (MGDs) of 2.5 mGy and 2.5 + 2.5 mGy, on mammary cells in vitro. METHODS: We used the non-tumorigenic cell line (MCF-10A) and two tumor cells lines (MCF-7 and MDA-MB-231). Colony formation, apoptosis, and double-strand DNA breaks (DSBs) were quantified. RESULTS: The selected MGD regimens did not alter the formation of colonies by any of the cell lines. MCF-7 cells exhibited a markedly increase in apoptosis, 24 h after the single-dose protocol; MCF-10A cells underwent apoptosis only after 72 h, with both irradiation regimens, while MDA-MB-231 cells (highly invasive and metastatic) were not susceptible to apoptosis. The detection of γH2AX histone in the nuclei of irradiated cells showed that the double-dose resulted in increase of DSBs, especially in tumor cell lines. CONCLUSIONS: Although the health benefits of early breast screening remain indisputable, our future perspective is to better understand the biological basis for the effects of low dose radiation on breast cells and to investigate if and under what conditions there would be a risky situation in repeated mammography screening, in both asymptomatic and symptomatic women.


Assuntos
Neoplasias da Mama , Mamografia , Mama , Linhagem Celular Tumoral , Quebras de DNA de Cadeia Dupla , Feminino , Humanos , Raios X
7.
Microbiol Resour Announc ; 10(16)2021 Apr 22.
Artigo em Inglês | MEDLINE | ID: mdl-33888509

RESUMO

We present the genome sequence of a bacterial strain isolated from park25 mutants of Drosophila melanogaster as part of efforts to better understand the microbial communities in D. melanogaster We isolated and sequenced a Lactiplantibacillus plantarum strain. We present a preliminary comparative analysis with a closely related strain.

8.
Int J Radiat Biol ; 97(7): 877-887, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33900904

RESUMO

Purpose: Technological advancement in the treatment of cancer together with early detection and diagnosis have considerably improved the survival of breast cancer patients. On the other hand, the potential of patients developing side effects from cancer treatment are not negligible. Despite the progress that has been made in terms of early diagnosis, therapy, and survival, including improvements in the chemotherapeutic agents, radiation and molecular targeted therapies, cardiotoxicity of cancer therapy is still cause for concern. Radiation therapy for breast cancer is associated with increased risk of heart disease and myocardial infarction. Furthermore, the association of radiation therapy to chemotherapy is an important aspect to be considered in the development of cardiac disease, as this could play an additional role as a risk factor. Besides the heart effect, other side effects can be observed in the bone, ovary, uteri, and other organs. This paper aims to review the recent literature to present the current understanding of side effects associated with breast cancer treatment. The focus is on recent preclinical studies that have assessed potential changes in different organs that may be injured after breast cancer treatment, both due to both radiation and chemotherapy agents.Conclusion: Radiation-induced heart disease is one important side effect that must be considered during the treatment planning and patient follow-up. The cardiac damage can be potentialized when chemotherapy is associated to radiotherapy, and the literature findings indicate that heart fibrosis plays an important role at the radio-chemotherapy induced cardiac damage. Literature findings also showed important side effects at the bone, that can lead to ospeoporosis, due to the decrease of calcium, after radio or chemotherapy treatments. This decrease could be explained by the ovarian failure observed at rats after chemotherapy treatment. It is of great importance to acknowledge the complications originating from the treatment, so that new strategies can be developed. In this way, it will be possible to minimize side effects and improve the patients' quality of life.


Assuntos
Neoplasias da Mama/terapia , Animais , Antineoplásicos/efeitos adversos , Neoplasias da Mama/tratamento farmacológico , Neoplasias da Mama/radioterapia
9.
Environ Monit Assess ; 193(2): 82, 2021 Jan 23.
Artigo em Inglês | MEDLINE | ID: mdl-33486539

RESUMO

The aim of the present study was to examine the genotoxicity induced by water-soluble fractions of particulate matter (PM) and its potential relation with heavy metals. For this purpose, the genotoxicity induced on human peripheral lymphocytes by water-soluble PM2.5 (particles with aerodynamic diameter ≤ 2.5 µm) collected from the indoor air of various workplaces in Greece (n = 20), was examined by the Sister Chromatid Exchange (SCE) induction assay and assessed in relation to the concentrations of the heavy metals Cu, Pb, Mn, Ni, Co, Zn, Cr, and Cd. The number of SCEs per metaphase (SCEs/metaphase), as an indicator of genotoxicity, the proliferation rate index (PRI), as an indicator of cytostaticity, and the mitotic index (MI), as an indicator of cytotoxicity, were measured and assessed in three water-soluble fractions of PM2.5: the total water-soluble fraction WSA (filtered through 0.45 µm), the dissolved fraction WSB (filtered through 0.22 µm), and the non-chelexed dissolved fraction WSC (filtered through Chelex-100 resin). Results showed statistically significant number of SCEs/metaphase in all water-soluble PM2.5 fractions in relation to the control with large variabilities across the workplaces as a result of variations in indoor conditions, sources, and/or activities. The concentrations of genotoxicity were evaluated in terms of mass-normalized genotoxicity (SCEs/mg PM2.5), that represents the genotoxic potency of particles, and air volume-normalized genotoxicity (SCEs/m3 air), that reflects the inhalation risk for people working or spending much time in these microenvironments. Correlation and linear regression analyses were further employed in order to investigate the potential relationships between genotoxicity and the water-soluble concentrations of PM2.5-bounded heavy metals. According to the results, the highest mass-normalized genotoxicity values were found for PM2.5 from the photocopying center, whereas the highest air volume-normalized genotoxicity was found in tavern-2. Significant positive correlations between the genotoxicity and water-soluble metals were derived, highlighting the role that heavy metals play in the genotoxicity of indoor PM2.5. Among the targeted metals, Zn and Pb were found to be good predictors of the genotoxicity of water-soluble PM2.5.


Assuntos
Poluentes Atmosféricos , Metais Pesados , Poluentes Atmosféricos/análise , Poluentes Atmosféricos/toxicidade , Dano ao DNA , Monitoramento Ambiental , Grécia , Humanos , Metais Pesados/análise , Metais Pesados/toxicidade , Material Particulado/análise , Material Particulado/toxicidade , Água
10.
Microbiol Resour Announc ; 10(1)2021 Jan 07.
Artigo em Inglês | MEDLINE | ID: mdl-33414300

RESUMO

Here, we report the genome of Acetobacter tropicalis DmPark25_167, a bacterial strain isolated from a Drosophila melanogaster park25 mutant. The park25 mutant is an established genetic model of Parkinson's disease. DmPark25_167 has duplicated methionine metabolism and type IV secretion gene alleles compared with another strain of A. tropicalis.

11.
Molecules ; 25(15)2020 Jul 28.
Artigo em Inglês | MEDLINE | ID: mdl-32731380

RESUMO

Microalgae productive chains are gaining importance as sustainable alternatives to obtain natural pigments. This work presents a review on the most promising pigments and microalgal sources by gathering trends from a 10-year bibliometric survey, a patents search, and an industrial and market analysis built from available market reports, projects and companies' webpages. The performed analysis pointed out chlorophylls, phycocyanin, astaxanthin, and ß-carotene as the most relevant pigments, and Chlorella vulgaris, Spirulina platensis, Haematococcus pluvialis, and Dunaliella salina, respectively, as the most studied sources. Haematococcus is referred in the highest number of patents, corroborating a high technological interest in this microalga. The biorefinery concept, investment in projects and companies related to microalgae cultivation and/or pigment extraction is increasingly growing, particularly, for phycocyanin from Spirulina platensis. These pieces of evidence are a step forward to consolidate the microalgal pigments market, which is expected to grow in the coming years, increasing the prospects of replacing synthetic pigments by natural counterparts.


Assuntos
Indústria Farmacêutica , Microalgas/química , Indústria Farmacêutica/economia , Indústria Farmacêutica/tendências , Ficocianina/química , Ficocianina/isolamento & purificação , Pigmentos Biológicos/química , Pigmentos Biológicos/economia , Pigmentos Biológicos/isolamento & purificação
12.
Molecules ; 25(9)2020 Apr 30.
Artigo em Inglês | MEDLINE | ID: mdl-32365923

RESUMO

Water-in-oil (W/O) emulsions have high potential for several industrial areas as delivery systems of hydrophilic compounds. In general, they are less studied than oil-in-water (O/W) systems, namely in what concerns the so-called fluid systems, partly due to problems of instability. In this context, this work aimed to produce stable W/O emulsions from a natural oil, sweet almond oil, to be further tested as vehicles of natural hydrophilic extracts, here exemplified with an aqueous cinnamon extract. Firstly, a base W/O emulsion using a high-water content (40/60, v/v) was developed by testing different mixtures of emulsifiers, namely Tween 80 combined with Span 80 or Span 85 at different contents. Among the tested systems, the one using a 54/46 (v/v) Span 80/Tween 80 mixture, and subjected to 12 high-pressure homogenizer (HPH) cycles, revealed to be stable up to 6 months, being chosen for the subsequent functionalization tests with cinnamon extract (1.25-5%; w/v; water-basis). The presence of cinnamon extract leaded to changes in the microstructure as well as in the stability. The antimicrobial and antioxidant analysis were evidenced, and a sustained behavior compatible with an extract distribution within the two phases, oil and water, in particular for the higher extract concentration, was observed.


Assuntos
Anti-Infecciosos/química , Anti-Infecciosos/farmacologia , Portadores de Fármacos/química , Emulsões/química , Óleos/química , Água/química , Antioxidantes/química , Antioxidantes/farmacologia , Cinnamomum zeylanicum/química , Interações Hidrofóbicas e Hidrofílicas , Testes de Sensibilidade Microbiana , Extratos Vegetais/química , Extratos Vegetais/farmacologia
13.
Anat Rec (Hoboken) ; 303(8): 2202-2212, 2020 08.
Artigo em Inglês | MEDLINE | ID: mdl-31855314

RESUMO

Statins are prescribed to prevent and treat atherosclerotic cardiovascular and metabolic diseases but have controversial effects on skeletal muscles. While statins are a reported cause of myopathy, some studies have suggested that statins could potentially ameliorate dystrophy due to their pleiotropic effects on inflammation, myonecrosis, and autophagy. In the present study, we evaluated the potential benefit of rosuvastatin treatment on heart, limb, and diaphragm muscles in dystrophin-deficient mdx mice at an early stage (45 days of age) of disease. Mdx mice received rosuvastatin (10 mg/kg) by gavage for 30 days beginning at 15 days of age. Normal C57BL/10 mice received rosuvastatin by the same route over the same interval. In the mdx group, rosuvastatin significantly increased IgG-positive fibers (myonecrosis) and the inflammatory areas in the biceps brachii and diaphragm muscles and decreased the anterior limb muscle force (grip strength). Molecular markers of inflammation (TNF-α and NF-kB) and fibrosis (fibronectin) were not altered by rosuvastatin in mdx mice skeletal and cardiac muscles. In normal mice, rosuvastatin increased CK, TNF-α (heart), NF-kB (diaphragm), and fibronectin (heart and diaphragm). Inflammatory areas were seen in all normal muscles of rosuvastatin-treated mice. Rosuvastatin did not benefit dystrophy in the mdx mice and was associated with inflammation in normal cardiac and skeletal muscles.


Assuntos
Coração/efeitos dos fármacos , Inibidores de Hidroximetilglutaril-CoA Redutases/farmacologia , Músculo Esquelético/efeitos dos fármacos , Distrofia Muscular Animal/metabolismo , Rosuvastatina Cálcica/farmacologia , Animais , Diafragma/efeitos dos fármacos , Diafragma/metabolismo , Modelos Animais de Doenças , Fibronectinas/metabolismo , Camundongos , Camundongos Endogâmicos mdx , Miocárdio/metabolismo , NF-kappa B/metabolismo , Fator de Necrose Tumoral alfa/metabolismo
14.
Mol Ecol ; 29(3): 639-653, 2020 02.
Artigo em Inglês | MEDLINE | ID: mdl-31863671

RESUMO

Organisms are locally adapted when members of a population have a fitness advantage in one location relative to conspecifics in other geographies. For example, across latitudinal gradients, some organisms may trade off between traits that maximize fitness components in one, but not both, of somatic maintenance or reproductive output. Latitudinal gradients in life history strategies are traditionally attributed to environmental selection on an animal's genotype, without any consideration of the possible impact of associated microorganisms ("microbiota") on life history traits. Here, we show in Drosophila melanogaster, a key model for studying local adaptation and life history strategy, that excluding the microbiota from definitions of local adaptation is a major shortfall. First, we reveal that an isogenic fly line reared with different bacteria varies the investment in early reproduction versus somatic maintenance. Next, we show that in wild fruit flies, the abundance of these same bacteria was correlated with the latitude and life history strategy of the flies, suggesting geographic specificity of the microbiota composition. Variation in microbiota composition of locally adapted D. melanogaster could be attributed to both the wild environment and host genetic selection. Finally, by eliminating or manipulating the microbiota of fly lines collected across a latitudinal gradient, we reveal that host genotype contributes to latitude-specific life history traits independent of the microbiota and that variation in the microbiota can suppress or reverse the differences between locally adapted fly lines. Together, these findings establish the microbiota composition of a model animal as an essential consideration in local adaptation.


Assuntos
Drosophila melanogaster/microbiologia , Drosophila melanogaster/fisiologia , Microbiota/genética , Adaptação Fisiológica/genética , Animais , Feminino , Características de História de Vida , Fenótipo
15.
Mater Sci Eng C Mater Biol Appl ; 99: 264-274, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-30889700

RESUMO

Heterometal oxide nanoparticles of bioessential metals are shedding new light to nanoparticle-inspired bioapplications. Pairing bioreactive elements like copper and iron can affect the redox dynamic and biological profile of the nanomaterial. Given the complexity of physicochemical properties, biological activity and toxicity concerns, extensive exploration is demanded, especially when active and less active oxidation states participate as in case of cuprous-ferric delafossite CuFeO2 (copper(I)-iron(III)), a less widespread nanomaterial. In that vein, CuFeO2 nanoparticles were synthesized and biological profile was evaluated in comparison with cuprous oxide (Cu2O NPs) counterpart, an already established antimicrobial agent. Interactions with bacteria, proteins and DNA were examined. Cu2O NPs exhibited stronger antibacterial activity (IC50 < 25 µg/ml) than CuFeO2 NPs (IC50 > 100 µg/ml). In vitro exposure of nanoparticles on plasmid DNA unveiled toxicity in the form of DNA damage for Cu2O and enhanced biocompatibility for CuFeO2 NPs. Genotoxicity estimated by the frequency of sister chromatid exchanges, cytostaticity based on the proliferating rate indices and cytotoxicity based on the mitotic indices at human peripheral lymphocyte cultures were all significantly lower in the case of CuFeO2 NPs. Furthermore, through in vitro albumin denaturation assay, CuFeO2 NPs showed better performance in protein denaturation protection, correlating in superior anti-inflammatory activity than Cu2O and similar to acetylsalicylic acid. Synergy of copper(I)-iron(III) in nanoscale is apparent and gives rise to fruitful bioapplications and perspectives.


Assuntos
Antibacterianos/farmacologia , Anti-Inflamatórios/farmacologia , Cobre/química , DNA/metabolismo , Compostos Férricos/farmacologia , Mutagênicos/toxicidade , Nanopartículas/toxicidade , Proteínas/metabolismo , Albuminas/metabolismo , Bactérias/efeitos dos fármacos , Bactérias/crescimento & desenvolvimento , Clivagem do DNA/efeitos dos fármacos , Testes de Sensibilidade Microbiana , Nanopartículas/química , Nanopartículas/ultraestrutura , Desnaturação Proteica/efeitos dos fármacos , Análise Espectral Raman , Difração de Raios X
16.
Mater Sci Eng C Mater Biol Appl ; 94: 493-508, 2019 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-30423734

RESUMO

Redox-active compounds such as copper-phenanthroline are known as artificial/chemical nucleases with a great impact and potential for their applications as metallotherapeutics. In that vein, the mononuclear copper(II) complexes [Cu(L)2(bipy)] (1), [Cu(L)2(bipy)(H2O)] (2) and [Cu(L)2(phen)(H2O)] (3), where L = 2-thiophene carboxylate, bipy = 2,2΄-bipyridine and phen = 1,10-phenanthroline, have been prepared and pharmacochemically studied, while the crystal structure of 1 is also reported. All the tested complexes preferably bind to CT-DNA via minor groove as resulted from UV spectroscopy studies, luminescent titration, EB competition assays and viscosity measurements. Complexes 2 and 3 in aqua behave like a "light switch" for DNA. The intensity enhancement, with the increase of DNA concentration, reached about 3-fold for 2 and 10-fold for 3. In vitro antioxidant activity of compounds 1-3, was evaluated using two different antioxidant assays: a) interaction with 1,1-diphenyl-2-picryl-hydrazyl (DPPH) stable free radical and b) inhibition of lipid peroxidation. Moreover, their inhibitory activity on soybean lipoxygenase (LOX) was evaluated for their anti-inflammatory potency. The tested complexes showed good activity on both lipid peroxidation and soybean LOX inhibition while complex 2 exhibited the best antioxidant/anti-inflammatory activity. A computational analysis over the LOX protein structure 1JNQ was performed, in an effort to support their possible mode of action. The cytotoxicity of the complexes was determined and their efficacy against several human cancer cell lines (ovarian, OAW-42; lung, A549; colon, HT29; breast, MDA-MB-231; kidney, Caki-2; and cervical, Hela) and human non-tumor cell lines (lung, MRC-5; and breast, MTSV1-7) were evaluated. The best cytotoxic activity was appeared for complex 3. In silico, computational methods support antiestrogen activity of the administered complexes on normal breast cells.


Assuntos
Anti-Inflamatórios/farmacologia , Antineoplásicos/farmacologia , Antioxidantes/farmacologia , Ácidos Carboxílicos/química , Cobre/química , DNA/química , Tiofenos/química , Animais , Bovinos , Morte Celular/efeitos dos fármacos , Linhagem Celular Tumoral , Humanos , Cinética , Simulação de Acoplamento Molecular , Espectrometria de Fluorescência , Viscosidade
17.
Environ Sci Pollut Res Int ; 25(35): 35322-35329, 2018 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-30341761

RESUMO

Jaboticaba Plinia peruviana (Poir.) Govaerts is a Brazilian berry that presents high levels of polyphenols, which may play a key role in preventing cytotoxic and genotoxic effects of harmful agents. Although copper is an essential micronutrient that plays an important role in organisms, high copper concentrations may trigger toxicity to animals and plants. Here, we investigated whether Plinia peruviana hydroalcoholic extract prevents copper-induced cytotoxicity in Allium cepa root cells. Five different anthocyanins and phenolic compounds were identified in Plinia peruviana extract. Importantly, the exposure to 1.53 mg/L copper for 24 h impaired mitotic index, as well as increased mitosis disturbances and triggered DNA damage. Pre-incubation with Plinia peruviana extract (0.25 g/L and 0.75 g/L) for 3 h prevented copper-induced changes in the mitotic index and reduced the number of abnormal cells. In conclusion, we suggest that Plinia peruviana peel extract has protective effects against cellular and genetic disturbances induced by copper.


Assuntos
Cobre/toxicidade , Dano ao DNA/efeitos dos fármacos , Poluentes Ambientais/toxicidade , Myrtaceae/química , Cebolas/efeitos dos fármacos , Extratos Vegetais/farmacologia , Animais , Antocianinas/isolamento & purificação , Antocianinas/farmacologia , Brasil , Frutas/química , Índice Mitótico , Modelos Teóricos , Cebolas/citologia , Cebolas/genética , Extratos Vegetais/isolamento & purificação , Polifenóis/isolamento & purificação , Polifenóis/farmacologia
18.
J Inorg Biochem ; 177: 159-170, 2017 12.
Artigo em Inglês | MEDLINE | ID: mdl-28964993

RESUMO

There is a growing field of research on the physicochemical properties of bimetallic nanoparticles (BMNPs) and their potential use in different applications. Meanwhile, their antimicrobial activity is scarcely reported, although BMNPs can potentially achieve unique chemical transformations and synergetic effects can be presented. Towards this direction a reproducible simple hybrid polyol process under moderate temperature solvothermal conditions has been applied for the isolation of non-oxide contaminated bimetallic CuFe nanoparticles (NPs). 1,2-propylene glycol (PG), tetraethylene glycol (TEG) and polyethylene glycol (PEG 8000), that exhibit different physicochemical properties, have been utilized to regulate the size, structure, composition and the surface chemistry of NPs. The BMNPs were found to be of small crystalline size, 30-45nm, and high hydrophilicity, different wt% percentage of organic coating and variable hydrodynamic size and surface charge. The antimicrobial activity of the BMNPs was evaluated against the bacterial strains B. subtilis, E. coli and fungus S. cerevisiae. The IC50 values for CuFe NPs were found significantly lower compared with Cu NPs of the same size, revealing an enhancement in the antimicrobial activity when iron and copper coexist in the crystal structure. The reactive oxygen species (ROS) production was measured intracellularly and extracellularly by the nitroblue tetrazolium assay in the fungal cultures. No extracellular ROS were measured suggesting that both CuFe and Cu NPs enter the fungal cells during the incubation, also verified by optical imaging of the fungal cells in the presence of NPs. Higher ROS concentrations were generated intracellularly for CuFe NPs supporting different red/ox reaction mechanisms.


Assuntos
Antibacterianos/farmacologia , Antifúngicos/farmacologia , Cobre/química , Ferro/química , Nanopartículas Metálicas/química , Polietilenoglicóis/farmacologia , Antibacterianos/química , Antifúngicos/química , Bacillus subtilis/efeitos dos fármacos , Escherichia coli/efeitos dos fármacos , Imagem Óptica , Tamanho da Partícula , Polietilenoglicóis/síntese química , Polietilenoglicóis/química , Espécies Reativas de Oxigênio/metabolismo , Saccharomyces cerevisiae/efeitos dos fármacos , Difração de Raios X
19.
Sci Total Environ ; 601-602: 906-917, 2017 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-28582736

RESUMO

A hybrid source-receptor modeling process was assembled, to apportion and infer source locations of PM10 and PM2.5 in three heavily-impacted urban areas of Greece, during the warm period of 2011, and the cold period of 2012. The assembled process involved application of an advanced computational procedure, the so-called Robotic Chemical Mass Balance (RCMB) model. Source locations were inferred using two well-established probability functions: (a) the Conditional Probability Function (CPF), to correlate the output of RCMB with local wind directional data, and (b) the Potential Source Contribution Function (PSCF), to correlate the output of RCMB with 72h air-mass back-trajectories, arriving at the receptor sites, during sampling. Regarding CPF, a higher-level conditional probability function was defined as well, from the common locus of CPF sectors derived for neighboring receptor sites. With respect to PSCF, a non-parametric bootstrapping method was applied to discriminate the statistically significant values. RCMB modeling showed that resuspended dust is actually one of the main barriers for attaining the European Union (EU) limit values in Mediterranean urban agglomerations, where the drier climate favors build-up. The shift in the energy mix of Greece (caused by the economic recession) was also evidenced, since biomass burning was found to contribute more significantly to the sampling sites belonging to the coldest climatic zone, particularly during the cold period. The CPF analysis showed that short-range transport of anthropogenic emissions from urban traffic to urban background sites was very likely to have occurred, within all the examined urban agglomerations. The PSCF analysis confirmed that long-range transport of primary and/or secondary aerosols may indeed be possible, even from distances over 1000km away from study areas.

20.
Mater Sci Eng C Mater Biol Appl ; 76: 1026-1040, 2017 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-28482466

RESUMO

Seeking for copper based metallo-therapeutics, three triple bridged dinuclear copper(II) complexes [Cu2(µ2-L2)(bipy)2(µ2-OH)(µ2-H2O)](NO3)2·H2O (1·H2O), [Cu2(µ2-L2)(bipy)2(µ2-OH)(µ2-NO3)](NO3)·0.6MeOH·0.4H2O (2·0.6MeOH·0.4H2O) and [Cu2(µ2-L1)(bipy)2(µ2-OH)(µ2-NO3)(H2O)](NO3)·2H2O (3·2H2O) where L2=2-thiophene acetato, L1=2-thiophene carboxylato and bipy=2,2'-bipyridine were synthesized and structurally characterized. The complexes were subjected in vitro to a pharmacochemical evaluation for their antioxidant/anti-inflammatory activity, cytotoxicity and efficacy against human ovarian, lung, colon, breast, kidney and cervical cancer cell lines along with non tumor human lung and breast cell lines. The biological results support the structure related cytotoxic activity of the compounds. Complex 3 presented a combination of best anticancer and anti-inflammatory activities. A computational analysis over the LOX-3 protein structure 1JNQ was performed to support the possible mode of action.


Assuntos
Neoplasias , 2,2'-Dipiridil , Anti-Inflamatórios , Cobre , Cristalografia por Raios X , Humanos , Estrutura Molecular
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