DEFAR - Artigos publicados em periódicos
URI permanente para esta coleçãohttp://www.hml.repositorio.ufop.br/handle/123456789/531
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Item Modulation of long non-coding RNAs by different classes of secondary metabolites from plants : a mini-review on antitumor effects.(2022) Almeida, Tamires Cunha; Seibert, Janaína Brandão; Amparo, Tatiane Roquete; Souza, Gustavo Henrique Bianco de; Silva, Glenda Nicioli da; Santos, Orlando David Henrique dosThe broad pharmacological spectrum of plants is related to their secondary metabolism, which is responsible for the synthesis of different compounds that have multiple effects on cellular physiology. Among the biological effects presented by phytochemicals, their use for the prevention and treatment of cancer can be highlighted. This occurs due to several mechanisms of antitumor ac- tion demonstrated by these compounds, including regulation of the cell signaling pathways and inhibi- tion of tumor growth. In this way, long non-coding RNAs (lncRNAs) appear to be promising targets for the treatment of cancer. Their deregulation has already been related to a variety of clinical- pathological parameters. However, the effects of secondary metabolites on lncRNAs are still restrict- ed. For this reason, the present review aimed to gather data on phytochemicals with action on lncRNAs in order to confirm their possible antitumor potential. According to the literature, terpenoid and flavonoid are the main examples of secondary metabolites involved with lncRNAs activity. In addition, the lncRNAs H19, CASC2, HOTAIR, NKILA, CCAT1, MALAT1, AFAP1-AS1, MEG3, and CDKN2B-AS1 can be highlighted as important targets in the search for new anti-tumor agents since they act as modulating pathways related to cell proliferation, cell cycle, apoptosis, cell migration and invasion. Finally, challenges for the use of natural products as a commercial drug were also discussed. The low yield, selectivity index and undesirable pharmacokinetic parameters were emphasized as a difficulty for obtaining these compounds on a large scale and for improving the potency of its biologi- cal effect. However, the synthesis and/or development of formulations were suggested as a possible approach to solve these problems. All of these data together confirm the potential of secondary me- tabolites as a source of new anti-tumor agents acting on lncRNAs.Item Chemical constituents, antioxidant potential, antibacterial study and photoprotective activity of Brazilian corn silk extract.(2022) Azevedo, Amanda Scofield de; Seibert, Janaína Brandão; Amparo, Tatiane Roquete; Antunes, Amanda dos Santos; Sousa, Lucas Resende Dutra; Souza, Gustavo Henrique Bianco de; Teixeira, Luiz Fernando de Medeiros; Vieira, Paula Melo de Abreu; Santos, Viviane Martins Rebello dos; Nascimento, Adriana Mendes do; Nascimento, Andréa Mendes doThe aim of this work was to determine the total phenolic content and evaluate the antioxidant, antibacterial, photoprotective and cytotoxic properties of corn silk ethanol extract prepared from corn silk that was air-dried at room temperature. Corn silk ethanol extract has a high content of phenolic compounds. The concentrations of ethanol extract required to produce 50% of maximal effect (EC50) in DPPH and ABTS radical scavenging assays were 489.0 and 166.1 μg/mL respectively, indicating low activity when compared to the positive control. The ethanolic extract of corn silk showed antibacterial activity, mainly on Gram-positive bacteria. The in vitro sun protection factor (SPF) of the ethanolic extract of corn silk incorporated into sunscreen UVA-UVB 5% gel with Pemulen TR-1® was evaluated for the first time. A relative increase in SPF efficacy was observed for the extract when the sunscreen was incorporated. The ethanolic extract of corn silk and the gel were considered non-cytotoxic. The corn silk ethanolic extract was characterized using ultra performance liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry (UPLC-QTOF-MS/MS). Eleven compounds including flavonoids, coumaric acid derivatives, terpenoid, hydroxycinnamic acid derivative and quinic acid derivative were suggested based on their accurate mass and MS/MS spectra.Item Anti-zika activity of Ouratea semiserrata and dereplication of its constituents.(2021) Ferreira, Gabriel Monteze; Silva, Breno de Mello; Souza, Gustavo Henrique Bianco de; Oliveira, Alaíde Braga de; Brandão, Geraldo CélioZika virus is an arbovirus that has vector mosquitoes of the genus Aedes. In adult humans, the infection may be asymptomatic or present mild symptoms such as itching and low fever. However, the infection is associated with other severe problems, which encouraged investigations for an effective treatment against this virus. This work evaluated the potential anti-Zika virus effect of the ethanolic extract of Ouratea semiserrata (Mart. & Nees) Engl., Ochnaceae, a medicinal plant popularly used in Brazil for the treatment of viral infections. The extract of the stems was prepared by cold percolation using ethanol as solvent and its content dereplicated by ultra-high-performance liquid chromatography-diode array detector-tandem mass spectrometry. Phenolic com- pounds including rutin, catechin, and epicatechin were identified as the major constituents. The antiviral activity was tested in vitro against Zika virus by the MTT colorimetric method. The ethanol extract inhibited the viral replication cycle with an EC50 of 37.5 μg/ml, and at the concentration of 100 μg/ml, a 100% inhibition of the viral cytopathic effect was obtained. Rutin and epicatechin inhibited viral cytopathic effect in Vero cells with EC50 > 50.00 μg/ml.Item In vitro and in silico investigation of the photoprotective and antioxidant potential of Protium spruceanum leaves and its main flavonoids.(2022) Amparo, Tatiane Roquete; Silva, Anne Cherem Peixoto da; Seibert, Janaína Brandão; Silva, Débora dos Santos da; Santos, Viviane Martins Rebello dos; Vieira, Paula Melo de Abreu; Brandão, Geraldo Célio; Souza, Gustavo Henrique Bianco de; Santos, Bianca Aloise Maneira CorrêaFor the first time, the photoprotective potential (UV absorption and antioxidant properties) of Protium spru- ceanum leaves and its main flavonoids was investigated combining an in vitro and in silico approach. The extract was standardized in rutin content (0.8% w/w), quantified by a validated HPLC-DAD method. The extract pro- tected fibroblasts and keratinocytes against cell death in the stress oxidative H2O2-induced test, with greater effect than rutin standard. This cytoprotection is correlated to the free radical scavenging action, determined by DPPH method. The theoretical investigation on the UV absorption showed an excellent correlation of the results (R2 = 0.911) allowing valuable information about the photoprotective properties of rutin, afzelin and quercitrin, as the importance of the A, B and C rings in the UV absorption property and the hydroxyls in B ring (catechol group) leading to a better antioxidant action. Therefore, the extract from P. spruceanum leaves is a promising candidate for sunscreen development.Item Melaleuca leucadendron (L.) L. flower extract exhibits antioxidant and photoprotective activities in human keratinocytes exposed to ultraviolet B radiation.(2020) Silva, Luan Silvestro Bianchini; Perasoli, Fernanda Barçante; Carvalho, Karen Vitor; Vieira, Karla Murata; Lopes, Miriam Teresa Paz; Souza, Gustavo Henrique Bianco de; Santos, Orlando David Henrique dos; Freitas, Katia MichelleRecently, there has been a demand for the replacement of chemical sunscreens with natural compounds that could prevent or restore UV-induced skin damage. Here, we investigated the photoprotective influence of the Melaleuca leucadendron ethanolic flower extract (EEMec) on factors involved in cellular and molecular UVBinduced oxidative stress in human skin keratinocytes (HaCaT). The phytochemical constituents, antioxidant potential by DPPH assay, content of total phenolic and flavonoid compounds in EEMec were evaluated. HaCaT cells were treated with EEMec followed by irradiation with UVB. CAT activity; GSH and ROS levels; and SOD1, GPx, CAT and COX-2 expression assays were employed to verify the oxidative stress, as well as EEMec effect on transmembrane transport, and pro-inflammatory and pro-apoptotic protein expression. EEMec reverted the viability loss of HaCaT cells after irradiation with UVB, exhibited significant antioxidant capacity and free radical scavenging activity in vitro, inhibited COX-2 expression and ensure protection of DNA-damage. EEMec shown a great photoprotective property to prevent keratinocytes damage induced by UV radiation and, thus a candidate potential to application as an adjuvant in sunscreen formulations as a strategy to reduce risk of sunburn and prevent skin diseases associated with UV-induced inflammation and cancer.Item Desenvolvimento de nanoemulsão fotoprotetora de Passiflora edulis.(2019) Almeida, Juliana Cristina dos Santos; Ribeiro, Thascilaine de Souza; Silva, Luan Silvestro Bianchini; Perasoli, Fernanda Barçante; Figueiredo, Bruna Inez Carvalho de; Carvalho, Karen Vitor; Dôres, Rosana Gonçalves Rodrigues das; Souza, Gustavo Henrique Bianco de; Santos, Orlando David Henrique dosO surgimento de inúmeras doenças, como o câncer de pele e o fotoenvelhecimento estão relacionados com a radiação solar em excesso, constituindo um considerável problema de saúde pública. O desenvolvimento fotoprotetores têm sido estimulado com o intuito de proteger a pele dos efeitos nocivos da radiação ultravioleta (UV). O objetivo do presente trabalho foi avaliar o potencial fotoprotetor (FPS) do extrato etanólico bruto (EB) de Passiflora edulis; a associação com a nanoemulsão e a atividade fotoprotetora; além de caracterizar as nanoemulsões quanto ao diâmetro médio, índice de polidispersão (IP) e potencial zeta. Foram desenvolvidas três nanoemulsões tópicas para incorporação do extrato a 0,5%. As nanoemulsões foram avaliadas visualmente quanto à aparência macroscópica 24 horas após o preparo, observando a presença ou não de sinais de instabilidade, como precipitação e separação de fases. Na formulação A, B e C, o extrato bruto foi solubilizado em Croduret, PEG e DMSO, respectivamente. O FPS foi determinado pelo método espectrofotométrico. Visualmente, a formulação A incorporou 100% do EB adicionado e apresentou-se estável após 24 horas. Entretanto, as formulações B e C não incorporaram todo o EB adicionado, ocasionando em separação das nanoemulsões em duas fases. O FPS foi determinado para o extrato etanólico bruto e para a formulação A. Para o extrato etanólico, o valor de FPS encontrado foi igual 11 e para a formulação A antes e após a incorporação do EB, FPS 4 e FPS 20, respectivamente. O diâmetro médio da formulação A sem e com extrato foi de 70,24 ± 0,12 nm e 72,10 ± 0,39 nm, respectivamente, indicando que não houve mudança significativa do diâmetro médio da nanoemulsão após a incorporação do EB. O IP da formulação A antes e após a adição de EB foi inferior a 0,3, caracterizando as mesmas como monodispersas. Os resultados apresentados mostraram que a associação do EB à formulação A resultou no aumento da sua atividade fotoprotetora.Item Photoprotective activity and increase of SPF in sunscreen formulation using lyophilized red propolis extracts from Alagoas.(2019) Almeida, Wanessa Aparecida da Silveira; Antunes, Amanda dos Santos; Penido, Ricardo Gonçalves; Correa, Helen Silva da Gloria; Nascimento, Andréa Mendes do; Andrade, Ângela Leão; Santos, Vagner Rodrigues; Cazati, Thiago; Amparo, Tatiane Roquete; Souza, Gustavo Henrique Bianco de; Freitas, Katia Michelle; Santos, Orlando David Henrique dos; Sousa, Lucas Resende Dutra; Santos, Viviane Martins Rebello dosThe excessive sun exposure, coupled with lack of sun protection represents one of the biggest risks to the occurrence of skin cancer and photoaging. Recent strategies for photoprotection have included the incorporation of natural antioxidant and anti-inflammatory compounds, into sunscreens, and the oral administration of natural antioxidant extracts. In this work, we use Brazilian red propolis extract because its antioxidant and anti-inflammatory activities. The aim of this work was to evaluate the sun protection factor and antioxidant activity of different hydroalcoholic extracts of red propolis (70% and 75%) prepared from lyophilized red propolis at room and high temperatures. The sun protection factor in vitro was determined by a spectrophotometric method developed by Mansur. The hydroalcoholic extracts of red propolis incorporated with Filter UVA-UVB 5% Gel Permulem TR-1 presented absorption in the UVB region. Also, the in vitro capacity of the hydroalcoholic extracts of red propolis to increase photoprotective activity of Filter UVA-UVB 5% Gel was evaluated. The hydroalcoholic extracts of red propolis incorporated presented higher values of sun protection factor and showed synergism in the photoprotective activity of Filter UVA-UVB 5% Gel Permulem TR-1. The antioxidant activity and sun protection factor are correlated with total phenolics content of the extracts and the hydroalcoholic extract of red propolis 75% at room temperature was choosen. The formulation developed with Filter UVA-UVB 5% Gel Permulem TR-1 with this hydroalcoholic extract of red propolis showed safe to be applied on the skin according HET-CAM test. Suggests indication of hydroalcoholic extract of red propolis (75% – room temperature) associated to photoprotective formulations for use in photoprotective products.Item Seasonality study of essential oil from leaves of Cymbopogon densiflorus and nanoemulsion development with antioxidant activity.(2019) Seibert, Janaína Brandão; Rodrigues, Ivanildes Vasconcelos; Carneiro, Simone Pinto; Amparo, Tatiane Roquete; Lanza, Juliane Sousa; Frezard, Frederic Jean Georges; Souza, Gustavo Henrique Bianco de; Santos, Orlando David Henrique dosThe development of formulations that maintain the biological and physical chemistry properties of essential oils is an important choice when they are used as an active ingredient. This study aimed to characterize the essential oil from leaves of Cymbopogon densiflorus and evaluate the antioxidant activity of the oil, and to produce a nanoemulsion formulation containing it. The essential oil was obtained by hydrodistillation, and seasonality was analysed every 2 months by gas chromatography–mass spectrometry, showing that more than 90% of the composition was maintained for the whole period and that the major compounds were trans‐p‐menta‐2,8‐dien‐1‐ol, cis‐p‐menta‐2,8‐dien‐1‐ol, trans‐p‐menta‐1(7),8‐dien‐2‐ol, cis‐piperitol, and cis‐p‐menta‐1(7),8‐dien‐2‐ol. Stable nanoemulsions were prepared by phase inversion method encapsulating the essential oil. The antioxidant activity was evaluated by 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH) free radical scavenging and 2,2′‐azino‐bis(3‐ethylbenzothiazoline‐6‐sulphonic acid (ABTS) methods. In the first test, free and nanoemulsified essential oil showed half‐maximal inhibitory concentration (IC50) values equivalent to 14.689 and 3.692 mg mL−1, respectively. In the second test, these values were 0.567 and 0.43 mg mL−1. The development of nanoemulsion‐based essential oil from leaves of C. densiflorus was viable, and the formulated oil was able to reproduce the antioxidant activity at a concentration four times lower than that of the pure essential oil.Item Development of propolis nanoemulsion with antioxidant and antimicrobial activity for use as a potential natural preservative.(2019) Seibert, Janaína Brandão; Silva, Jessica Paola Bautista; Amparo, Tatiane Roquete; Petit, Alicia; Pervier, Pauline; Almeida, Juliana Cristina dos Santos; Azevedo, Mariana Costa; Silveira, Benila Maria; Brandão, Geraldo Célio; Souza, Gustavo Henrique Bianco de; Teixeira, Luiz Fernando de Medeiros; Santos, Orlando David Henrique dosPropolis has demonstrated potential use as food preservative but it presents strong and unpleasant flavor that alters the sensory characteristics foods. A nanoemulsion was proposed to carry the Brazilian propolis extracts for use as natural food preservative. Antimicrobial and antioxidant activities and chemical constituents of the extracts were investigated. The latter were made by sequential extraction using different solvents (hexane, ethyl acetate and ethanol). Antimicrobial activity was evaluated by agar diffusion and microdilution methods and antioxidant activity by DPPH and ABTS assays. Extracts showed antibacterial and antioxidant activity, highlighting the ethanolic which contained artepillin-C, kaempferide, drupanin and p-coumaric acid as main compounds by LC-MS analysis. The nanoemulsion developed by phase inversion method was characterized and stable under thermal-stress and centrifugation conditions. Biological properties evaluated were effectively maintained by the formulation. It was concluded that the nanoemulsion can be used as a food preservative, preventing degradation and masking the propolis off-flavor.Item Antibacterial activity of extract and fractions from branches of Protium spruceanum and cytotoxicity on fibroblasts.(2017) Amparo, Tatiane Roquete; Rodrigues, Ivanildes Vasconcelos; Seibert, Janaína Brandão; Souza, Rafaella Hilda Zaniti; Oliveira, Amanda Ribeiro de; Cabral, Vivette Appolinário Rodrigues; Vieira, Paula Melo de Abreu; Brandão, Geraldo Célio; Okuma, Adriana Akemi; Vieira Filho, Sidney Augusto; Teixeira, Luiz Fernando de Medeiros; Souza, Gustavo Henrique Bianco deThe crude ethanol extract (CEE) and fractions from branches of Protium spruceanum were subjected to antibacterial and cytotoxicity assays. Compounds of the most active fraction were identified by GC-MS and LC-MS. CEE was active against 19 bacteria and the ethyl acetate fraction (EAF) showed the lowest minimum bactericidal concentration (MBC 0.3–80.0 mg/mL). Through time-kill assay was observed that EAF induced rapid bactericidal effect against Staphylococcus saprophyticus. The cytotoxicity tests against L929 fibroblasts showed great potential of EAF on the treatment of infections caused by five bacteria (MBC < IC50). The results provide in vitro scientific support to the possible application of branches of P. spruceanum as antimicrobial agent that may contribute for treatment of infections.