DBQ - Departamento de Bioquímica

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Anti-IIa activity and antitumor properties of a hybrid heparin/heparan sulfate-like compound from Litopenaeus vannamei shrimp
(Elsevier, 2018-06-30) Brito, Adriana da Silva; Cavalcante, Rômulo S.; Cavalheiro, Renan P.; Palhares, Laís C. G. F.; Nobre, Leonardo Thiago Duarte Barreto; Souza, Giulianna Paiva Viana de Andrade; Nader, Helena B.; Lima, Marcelo A.; Chavante, Suely Ferreira
In this present study, the anti-IIa activity and the antitumor properties of a hybrid heparin/heparan sulfate-like compound (sH/HS) from Litopenaeus vannamei shrimp heads are related. In addition to inhibiting 90.7% of thrombin activity at the lowest tested concentration (0.5 μg/mL), sH/HS compound stimulated the synthesis of antithrombotic heparan sulfate by endothelial cells in a dose-dependent manner. In vitro experiments demonstrated that the molecule from shrimp displayed a potent anti-angiogenic effect, reducing over 80% of the tubular structures formation at 50 and 100 μg/mL. In addition, sH/HS compound was able to inhibit the migration of B16F10 cells at all tested concentrations without affecting the cell viability. Although the studied compound had no effect on the proliferation of such cells during a period of 24 h, it had a significant long-term antiproliferative effect, reducing about 80% of colony formation and anchorage-independent growth at 50 and 100 μg/mL concentrations. When its effectiveness was tested in vivo, it was demonstrated that sH/HS promoted a reduction of more than 90% of tumor growth. In the context of thromboembolic disorders associated with cancer, such findings make the sH/HS compound an excellent target for studies on inhibiting of development and tumor progression, and the prevention of coagulopathies
Anticoagulant, antioxidant and antitumor activities of heterofucans from the seaweed Dictyopteris delicatula
(MDPI, 2011-05-23) Magalhaes, Kaline Dantas; Costa, Leandro Silva; Fidelis, Gabriel Pereira; Oliveira, Ruth Medeiros; Nobre, Leonardo Thiago Duarte Barreto; Dantas-Santos, Nednaldo; Câmara, Rafael Barros Gomes da; Albuquerque, Ivan Rui Lopes; Cordeiro, Sara Lima; Sabry, Diego Araujo; Costa, Mariana Santana Santos Pereira; Alves, Luciana Guimaraes; Rocha, Hugo Alexandre de Oliveira
In the present study, six families of sulfated polysaccharides were obtained from seaweed Dictyopteris delicatula by proteolytic digestion, followed by acetone fractionation and molecular sieving on Sephadex G-100. Chemical analyses demonstrated that all polysaccharides contain heterofucans composed mainly of fucose, xylose, glucose, galactose, uronic acid, and sulfate. The fucans F0.5v and F0.7v at 1.0 mg/mL showed high ferric chelating activity (~45%), whereas fucans F1.3v (0.5 mg/mL) showed considerable reducing power, about 53.2% of the activity of vitamin C. The fucan F1.5v presented the most prominent anticoagulant activity. The best antiproliferative activity was found with fucans F1.3v and F0.7v. However, F1.3v activity was much higher than F0.7v inhibiting almost 100% of HeLa cell proliferation. These fucans have been selected for further studies on structural characterization as well as in vivo experiments, which are already in progress
Antioxidant fucoidans obtained from tropical seaweed protect pre-osteoblastic cells from hydrogen peroxide-induced damage
(MDPI, 2019-08-28) Fidelis, Gabriel Pereira; Silva, Cynthia Haynara Ferreira; Nobre, Leonardo Thiago Duarte Barreto; Medeiros, Valquíria Pereira; Rocha, Hugo Alexandre de Oliveira; Costa, Leandro Silva
Some antioxidant compounds decrease the amount of intracellular reactive oxygen species (ROS) and consequently reduce the deleterious effects of ROS in osteoblasts. Thus, these compounds fight against osteoporosis. Brown seaweeds are a rich source of antioxidant fucose-containing sulfated polysaccharides (fucans and fucoidans). We obtained six fucoidans (FRFs)—F0.3, F0.5, F0.7, F1.0, F1.5, and F2.1—from Dictyota mertensii by proteolytic digestion followed by sequential acetone precipitation. Except for F0.3, all FRFs showed antioxidant activity in different in vitro tests. In pre- osteoblast-like cells (MC3T3-L1) exposed to H2O2-oxidative stress, caspase-3 and caspase-9 were activated, resulting in apoptosis of the cells. We also observed a decrease in superoxide dismutase (SOD) and alkaline phosphatase (ALP) activity. The antioxidant FRFs protected the cells from the oxidative damage caused by H2O2, decreasing intracellular ROS and caspase activation, and increasing SOD activity. The most effective protection against damage was provided by F0.7, F1.5, and F2.1. At 0.5 mg/mL, these FRFs also suppressed the H2O2-mediated inhibition of ALP activity. The data indicated that FRFs F0.7, F1.5, and F2.1 from D. mertensii were antioxidants that protected bone tissue from oxidative stress and could represent possible adjuvants for the treatment of bone fragility through counteracting oxidative phenomena
Antioxidant sulfated polysaccharide from edible red seaweed Gracilaria birdiae is an inhibitor of calcium oxalate crystal formation
(MDPI, 2020-04-28) Oliveira, Leticia Castelo Branco Peroba; Queiroz, Moacir Fernandes; Fidelis, Gabriel Pereira; Melo, Karoline Rachel Teodosio; Câmara, Rafael Barros Gomes da; Alves, Monique Gabriela das Chagas Faustino; Costa, Leandro Silva; Teixeira, Dárlio Inácio Alves; Melo-Silveira, Raniere Fagundes; Rocha, Hugo Alexandre de Oliveira
The genus Gracilaria synthesizes sulfated polysaccharides (SPs). Many of these SPs, including those synthesized by the edible seaweed Gracilaria birdiae, have not yet been adequately investigated for their use as potential pharmaceutical compounds. Previous studies have demonstrated the immunomodulatory effects of sulfated galactans from G. birdiae. In this study, a galactan (GB) was extracted from G. birdiae and evaluated by cell proliferation and antioxidant tests. GB showed no radical hydroxyl (OH) and superoxide (O2−) scavenging ability. However, GB was able to donate electrons in two further different assays and presented iron- and copper-chelating activity. Urolithiasis affects approximately 10% of the world’s population and is strongly associated with calcium oxalate (CaOx) crystals. No efficient compound is currently available for the treatment of this disease. GB appeared to interact with and stabilize calcium oxalate dihydrate crystals, leading to the modification of their morphology, size, and surface charge. These crystals then acquired the same characteristics as those found in healthy individuals. In addition, GB showed no cytotoxic effect against human kidney cells (HEK-293). Taken together, our current findings highlight the potential application of GB as an antiurolithic agent
Antitryptical, anticoagulant and hemagglutinating activities of Eucalyptus sp. seeds
(F1000Research, 2019-01-08) Santos, Yago Queiroz dos; Carelli, Gabriella Silva Campos; Veras, Bruno Oliveira de; Batista, Virgínia Cunha; França, Anderson Felipe Jácome de; Silva, Márcia Vanusa da; Santos, Elizeu Antunes dos
Background: Plant biodiversity has great value for science being an inexhaustible source for new bioactive molecules capable of offering environmentally friendly and innovative solutions for various areas of the industry. The scientific community has increased their interest in the study of plant species in the search of new molecules and to determine their mechanisms of action. Plant seeds are natural sources of bioactive compounds, such as carbohydrates, lipids and proteins with special focus on enzymatic inhibitors which protect them against digestive enzymes of phytopathogens and lectins that play an important role on carbohydrate signalization and metabolism during germination. The objective of the present study was to evaluate and describe the protein profile and to test the hemagglutinating, hemolytic and anticoagulant activities, as well as the antitryptic effect of extracts and fractions obtained from seeds of Eucalyptus species. Methods: The crude protein extract was obtained from the seed of Eucalyptus sp. with 0.02 M sodium phosphate buffer, at pH 6.6, and fractionated using ammonium sulfate in order to study its antitryptical properties as well as the capacity of hemagglutination and influence on hemostasis. Results: The crude extract showed a high effectiveness for trypsin inhibition. For hemagglutinating activity, the ammonium sulfate fraction 0-30% presented better activity, while no hemolytic activity was present in the obtained fractions. For anticoagulation assay, the fraction 0-30% showed better results. Conclusions: Taken together, the obtained results demonstrate the biotechnological potential of Eucalyptus sp. seeds, although further study is still necessary to better isolate as well as describe the bioactive compounds
Aqueous leaf extract of Jatropha gossypiifolia L. (Euphorbiaceae) inhibits enzymatic and biological actions of Bothrops jararaca snake venom
(Public Library of Science, 2014-08-15) Félix-Silva, Juliana; Souza, Thiago; Menezes, Yamara A. S.; Cabral, Bárbara; Câmara, Rafael Barros Gomes da; Silva-Junior, Arnóbio Antonio da; Rocha, Hugo Alexandre de Oliveira; Rebecchi, Ivanise Marina Moretti; Langassner, Silvana Maria Zucolotto; Fernandes-Pedrosa, Matheus de Freitas
Snakebites are a serious public health problem due their high morbi-mortality. The main available specific treatment is the antivenom serum therapy, which has some disadvantages, such as poor neutralization of local effects, risk of immunological reactions, high cost and difficult access in some regions. In this context, the search for alternative therapies is relevant. Therefore, the aim of this study was to evaluate the antiophidic properties of Jatropha gossypiifolia, a medicinal plant used in folk medicine to treat snakebites. The aqueous leaf extract of the plant was prepared by decoction and phytochemical analysis revealed the presence of sugars, alkaloids, flavonoids, tannins, terpenes and/or steroids and proteins. The extract was able to inhibit enzymatic and biologic activities induced by Bothrops jararaca snake venom in vitro and in vivo. The blood incoagulability was efficiently inhibited by the extract by oral route. The hemorrhagic and edematogenic local effects were also inhibited, the former by up to 56% and the latter by 100%, in animals treated with extract by oral and intraperitoneal routes, respectively. The inhibition of myotoxic action of B. jararaca reached almost 100%. According to enzymatic tests performed, it is possible to suggest that the antiophidic activity may be due an inhibitory action upon snake venom metalloproteinases (SVMPs) and/or serine proteinases (SVSPs), including fibrinogenolytic enzymes, clotting factors activators and thrombin like enzymes (SVTLEs), as well upon catalytically inactive phospholipases A2 (Lys49 PLA2). Antiinflammatory activity, at least partially, could also be related to the inhibition of local effects. Additionally, protein precipitating and antioxidant activities may also be important features contributing to the activity presented. In conclusion, the results demonstrate the potential antiophidic activity of J. gossypiifolia extract, including its significant action upon local effects, suggesting that it may be used as a new source of bioactive molecules against bothropic venom
Baccharis trimera (Less.) DC exhibits an anti-Adipogenic effect by inhibiting the expression of proteins involved in adipocyte differentiation
(MDPI, 2017-06-12) Nascimento, Daniele de Souza Marinho do; Oliveira, Ruth Medeiros; Câmara, Rafael Barros Gomes da; Gomes, Dayanne Lopes; Monte, Jessika Fernanda Santiago; Costa, Mariana Santana Santos Pereira; Fernandes, Júlia Moraes; Langassner, Silvana Maria Zucolotto; Rocha, Hugo Alexandre de Oliveira
Baccharis trimera (Less.) DC (gorse) is a plant popularly used for the treatment of obesity. In this study, we prepared three B. trimera extracts aqueous extract (AE), decoction (AE-D), and methanol extract (ME) and investigated their antioxidant effects in six different tests and their anti-adipogenic effect in 3T3-L1 cells. The extracts showed a dose-dependent antioxidant activity in all tests. AE was the most potent antioxidant in copper and ferric ion chelation assays, whereas AE-D was the most potent in superoxide and hydroxyl radical scavenging assays, reducing power assay, and total antioxidant capacity analysis. Only ME showed a cytotoxic effect against 3T3-L1 cells. Lipid accumulation decreased in 3T3-L1 adipocytes in the presence of AE and AE-D extracts (0.5 to 1.0 mg/mL). In addition, the extracts dramatically attenuated the levels of adipogenic transcriptional factors, including CCAAT enhancer-binding protein α (C/EBPα), CCAAT enhancer-binding protein β (C/EBPβ), and gamma receptors by peroxisome proliferators (PPARγ), during adipogenesis. AE-D (1.0 mg/mL) caused an approximately 90% reduction in the levels of these molecules. We propose that B. trimera has an anti-adipogenic effect and could be used in the development of functional foods
Characteristics of the biological cycle of lutzomyia evandroi Costa Lima & Antunes, 1936 (diptera: psychodidae) under experimental conditions
(Memorias do Instituto Oswaldo Cruz, 2001-08) Ximenes, Maria de Fátima Freire de Melo; Maciel, Janaina Cunha; Jeronimo, Selma Maria Bezerra
Commercial fucoidans from Fucus vesiculosus can be grouped into antiadipogenic and adipogenic agents
(MDPI, 2018-06-04) Oliveira, Ruth Medeiros; Câmara, Rafael Barros Gomes da; Monte, Jessyka Fernanda Santiago; Viana, Rony Lucas Silva; Melo, Karoline Rachel Teodosio; Queiroz, Moacir Fernandes; Filgueira, Luciana Guimarães Alves; Oyama, Lila Missae; Rocha, Hugo Alexandre de Oliveira
Fucus vesiculosus is a brown seaweed used in the treatment of obesity. This seaweed synthesizes various bioactive molecules, one of them being a sulfated polysaccharide known as fucoidan (FF). This polymer can easily be found commercially, and has antiadipogenic and lipolytic activity. Using differential precipitation with acetone, we obtained four fucoidan-rich fractions (F0.5/F0.9/F1.1/F2.0) from FF. These fractions contain different proportions of fucose:glucuronic acid:galactose:xylose:sulfate, and also showed different electrophoretic mobility and antioxidant activity. Using 3T3-L1 adipocytes, we found that all samples had lipolytic action, especially F2.0, which tripled the amount of glycerol in the cellular medium. Moreover, we observed that FF, F1.0, and F2.0 have antiadipogenic activity, as they inhibited the oil red staining by cells at 40%, 40%, and 50%, respectively. In addition, they decreased the expression of key proteins of adipogenic differentiation (C/EBPα, C/EBPβ, and PPARγ). However, F0.5 and F0.9 stimulated the oil red staining at 80% and increased the expression of these proteins. Therefore, these fucoidan fractions have an adipogenic effect. Overall, the data show that F2.0 has great potential to be used as an agent against obesity as it displays better antioxidant, lipolytic and antiadipogenic activities than the other fucoidan fractions that we tested
Cytotoxicity of chitosan oligomers produced by crude enzyme extract from the fungus metarhizium anisopliae in hepg2 and hela cells
(Hilaris Publisher, 2012) Santos, Everaldo Silvino dos; Assis, Cristiane Fernandes de; Melo-Silveira, Raniere Fagundes; Oliveira, Ruth Medeiros de; Costa, Leandro Silva; Rocha, Hugo Alexandre de Oliveira; Macedo, Gorete Ribeiro de
Chitooligosaccharides exhibit biological activities, including antitumor, antimicrobial and antioxidant. In this study we used a mixture of chitooligosaccharides produced by enzymatic hydrolysis in two tumor cell lines and assessed the cell proliferation and cytotoxicity of these compounds. The proliferation of HeLa cells was inhibited around by 60%
D2 dopamine receptor regulation of learning, sleep and plasticity
(Elsevier, 2015-01-16) França, A.S.C.; Soares, Bruno Lobão; Nascimento, George Carlos do; Jeronimo, Selma Maria Bezerra; Ribeiro, Sidarta Tollendal Gomes
Dual insecticidal effects of Adenanthera Pavonina kunitz-type inhibitor on Plodia Interpunctella is mediated by digestive enzymes inhibition and chitin-binding properties
(MDPI, 2019-11-28) Oliveira, Caio Fernando Ramalho de; Flores, Taylla Michelle de Oliveira; Cardoso, Marlon Henrique; Oshiro, Karen Garcia Nogueira; Russi, Raphael; França, Anderson Felipe Jácome de; Santos, Elizeu Antunes dos; Franco, Octávio Luiz; Oliveira, Adeliana Silva de; Migliolo, Ludovico
The Indianmeal moth, Plodia interpunctella, is one of the most damaging pests of stored products. We investigated the insecticidal properties of ApKTI, a Kunitz trypsin inhibitor from Adenanthera pavonina seeds, against P. interpunctella larvae through bioassays with artificial diet. ApKTI-fed larvae showed reduction of up to 88% on larval weight and 75% in survival. Trypsin enzymes extracted from P. interpunctella larvae were inhibited by ApKTI, which also demonstrated capacity to bind to chitin. Kinetic studies revealed a non-competitive inhibition mechanism of ApKTI for trypsin, which were further corroborated by molecular docking studies. Furthermore, we have demonstrated that ApKTI exhibits a hydrophobic pocket near the reactive site loop probably involved in chitin interactions. Taken together, these data suggested that the insecticidal activity of ApKTI for P. interpunctella larvae involves a dual and promiscuous mechanisms biding to two completely different targets. Both processes might impair the P. interpunctella larval digestive process, leading to larvae death before reaching the pupal stage. Further studies are encouraged using ApKTI as a biotechnological tool to control insect pests in field conditions
Effect of plasma‐nitrided titanium surfaces on the differentiation of pre‐osteoblastic cells
(Wiley, 2019-03-18) Moura, Carlos Eduardo B.; Queiroz Neto, Moacir F.; Braz, Janine Karla França da Silva; Aires, Michelle de; Farias, Nainsandra B. Silva; Barboza, Carlos Augusto Galvão; Cavalcanti Júnior, Geraldo Barroso; Rocha, Hugo Alexandre de Oliveira; Alves Júnior, Clodomiro
A titanium surface nitrided by plasma contains nitrogen ions that guarantee resistance to corrosion and biocompatibility. Despite this, no descriptions concerning the influence of the expression of cell adhesion proteins and their influence on osteogenic cell differentiation are available. Thus, the present study aimed to assess the response of murine pre‐osteoblastic cells (MC3T3‐E1) cultured on nitrided titanium surfaces. Pre‐osteoblastic cells were grown on polished titanium discs, used as controls, and on previously characterized plasma‐nitrided titanium discs. Cells from both groups were submitted to the MTT cell viability test. The expressions of α5, α2, and β1 integrin were assessed by flow cytometry and immunofluorescence, while osteocalcin expression was assessed by flow cytometry. The nitrided surface presented higher α2 and β1 integrin expressions, as well as osteocalcin expression, when compared to the polished surface, with no alterations in cell viability. These findings seem to suggest that the plasma nitriding treatment produces a titanium surface with the potential for effective in vitro osseointegration.
Egos has a reduced capacity to predicts GBS prognosis in Northeast Brazil
(Wiley, 2018) Dourado Junior, Mário Emílio Teixeira; Fernandes, Ugor T.; Ramos, Eugênio S.; Vital, Ana L. F.; Urbano, João C. C.; Queiroz, José W.; Jeronimo, Selma M. B.; https://orcid.org/0000-0002-9462-2294
Objective: The Erasmus Guillain Barre Outcome Score (EGOS) is a prognostic model that predicts the chance of being able to walk independently at 6 months after Guillain Barré syndrome (GBS). This study was conducted aiming to determine the validity of EGOS in a Brazilian population.Material and Methods: Data collected from GBS patients in Rio Grande do Norte, Brazil, were used to determine the validity of EGOS. GBS disability score was as-sessed in the second week of disease and at 6 months.Results: A total of 206 subjects were studied. The Brazilian patients were younger, with a more severe clinical presentation, with higher percentage of cranial nerve in-volvement and upper respiratory infection. There was no difference relative to sex or presence of anti- gangliosides antibodies. The demyelinating variant was more com-mon (73.9%). However, only 24% of the Brazilians with EGOS 5.5-7 were not able to walk after 6 months, compared to 52% to European Group. Nine patients (3.8%) pre-sented nodopathies, of these four had an EGOS >5, but only one of the latter group was unable to walk after 6 months of GBS.Conclusions: Erasmus Guillain Barre Outcome Score was not a good predictor for the ability to walk after 6 months of GBS in Rio Grande do Norte, Brazil. Differences could be that the Brazilian GBS were younger, or alternatively, it could be due to a different infection profile or in the incidence of nodopathies.
Evaluation of the antiproliferative activity of 2-amino thiophene derivatives against human cancer cells lines
(Elsevier, 2016-12) Aguiar, Andreza Conception Véras de; Moura, Ricardo Olímpio de; Mendonça Junior, Jaime Francisco Bezerra; Rocha, Hugo Alexandre de Oliveira; Câmara, Rafael Barros Gomes da; Schiavon, Manuela dos Santos Carvalho
In spite of great progress in understanding cancer biology, current therapeutic procedures remain unsatisfactory. Chemotherapy is often followed by secondary effects with cellular toxicity negatively affecting the results. The discovery and development of new safe and efficient antitumor agents is necessary. Derivatives of 2-amino thiophene have been a topic of constant investigation due to their versatile synthetic applicability and broad spectrum of biological applications; among which are antifungal and antiproliferative activity shown in prior studies of our group. In the current study, compounds 6CN09, 6CN10, 6CN12, 6CN14, 7CN09 and 7CN11 were analyzed as to antiproliferative effect in human cells of cervical adenocarcinoma (HeLa), human pancreatic adenocarcinoma (PANC-1) and mice fibroblasts (3T3), which were exposed to the compounds in concentrations of 5, 10, 25 and 50mM during 24 and 48 h. They were submitted to MTT assay. In order to elucidate the action mechanism of antitumor thiophene derivatives flow cytometry was performed to evaluate cell death and cell cycle analysis. The results showed that thiophene derivatives demonstrated great antiproliferative potential in the HeLa and PANC-1 cell lines when compared with the control, and the percentage of cell proliferation inhibition approximated or was higher than the standard drug used; doxorubicin (Dox). In highlight were the derivatives 6CN14 and 7CN09 that showed greater efficiency in the antiproliferative evaluation. Further, all compounds had a protective effect on the non-tumor 3T3 cell line. The flow cytometry analysis showed few cells in apoptosis in both the HeLa and PANC-1 lines, although the compounds interfered with the progression of the cell cycle, and avoided cell growth and multiplication in the HeLa tumor line. These thiophene derivatives demonstrated cytostatic and antiproliferative effects and may be considered as promising molecular candidates for anticancer drugs
Fractional recovery of oleaginous bioactive produced by Rhodotorula mucilaginosa CCT3892 using deep eutectic solvents
(Elsevier, 2020-12) Santos, Everaldo Silvino dos; Costa, Willyan Araújo da; Padilha, Carlos Eduardo de Araújo; Dantas, Júlia Maria de Medeiros; Silva, Maylla Maria Correia Leite; Rocha, Hugo Alexandre de Oliveira; Silva, Flávio Luiz Honorato da; Ferrari, Márcio
The use of four choline chloride-based deep eutectic solvents (DES) in the recovery of oleaginous compounds from Rhodotorula mucilaginosa CCT3892 cells were investigated in this study, focusing on a novelty treatment to recovery mini-compounds intercellular produced by the yeast, as alternative for conventional methods. Regarding DES ability to improve the yeast permeability for an eventual oil-lipids recovery, it was noticed that all solvents were as efficient as a hydrochloride acid treatment, presenting a recovery percentage above 100.0% in relation untreated cells extraction. The best total carotenoid recovery was achieved using DES synthetized with choline chloride an glycerol (ChGy treatment) (0.110 ± 0.005 mg.mL−1). DES promoted a fractional recovery of carotenoids being such process for R. mucilaginosa mentioned for the first time in this paper. Thus, showing potential to be used in the industry once the solvent preserved the antioxidant activity of carotenoids and exhibit moderated cytotoxicity
Frequency of stroke types at an emergency hospital in Natal, Brazil
(Arquivos de Neuro-Psiquiatria, 2007) Dourado Junior, Mário Emílio Teixeira; Martins Junior, Antonio N.N.; Figueiredo, Marcelo Marinho de; Rocha, Orlandil D.; Ferreira, Maria Angela Fernandes; Jeronimo, Selma Maria Bezerra; https://orcid.org/0000-0002-9462-2294
Realizamos um estudo de prevalência para determinar a freqüência dos tipos de acidente vascular cerebral (AVC) num hospital de urgência de Natal. Estudaram-se todos os pacientes que foram admitidos no hospital de urgência com diagnóstico presuntivo de AVC. Dos 416 pacientes, 328 foram estudados, 88 foram excluídos por não cumprirem os critérios de inclusão, 74,7% (n= 245) tiveram AVC isquêmico, 17,7% (n=58) hemorragia intracerebral e 7,6% (n=25) hemorragia subaracnóidea. O gênero mais prevalente foi o masculino (52,7%). A média de idade foi 64,1 anos. A letalidade intra-hospitalar foi de 10,2%, 17,2% e 36% para o tipo isquêmico, hemorrágico e hemorragia subaracnóide, respectivamente. O principal fator de risco modificável foi a hipertensão arterial sistêmica (HAS) para AVC isquêmico (67,6%) e AVC hemorrágico (57,8%). A regressão logística identificou diabetes como fator de risco independente para AVC isquêmico (OR=3,70; IC=1,76-7,77). O AVC isquêmico foi o tipo mais comum. HAS e diabetes foram importantes fatores de risco
A fucan of a brown seaweed and its antitumoral property on HT-29 and immunomodulatory activity in murine RAW 264.7 macrophage cell line
(Springer, 2017-02-19) Pinheiro, Thuane de Sousa; Santos, Marilia da S. Nascimento; Castro, Luiza Sheyla E. P. Will; Paiva, Almino Afonso de O.; Alves, Luciana G.; Cruz, Ana Katarina M.; Nobre, Leonardo Thiago Duarte Barreto; Alves, Monique Gabriela das Chagas Faustino; Leite, Edda Lisboa
Polysaccharides from algae are also proper candidates with therapeutic properties and immunomodulatory and antitumor effects. The brown seaweed Lobophora variegata synthesizes different groups of anionic polysaccharides with several biological properties. Sulfated polysaccharides were obtained by delipidation of seaweed, proteolysis, and fractionation with different volumes of acetone. A fraction of sulfated polysaccharides, fucans or fucoidans, was extracted with 0.8 v acetone and named L. variegata (LV). This fucan was assessed in the inflammatory process in rats, antitumor action on human colon adenocarcinoma (HT-29 cells), apoptosis, and its effect on the cell cycle. LV fraction, a galactofucan, exhibited a high ratio of total sugar/sulfate (1.5) and a very low level of proteins. This polysaccharide showed an antiinflammatory effect on two models of inflammation induced by croton oil and oxazolone in rats. LV was analyzed in cellular proliferation of HT-29. We also demonstrated the cytotoxic action against this cell line and induction in the apoptosis and decreased the cell cycle in phases S and G2/M and the accumulation of cells in the G1 phase. Our studies with LV showed a marked immunomodulatory action without and with lipopolysaccharide (LPS) on RAW 264.7 cells. Comparative studies of two fucans, LV and FV (Fucus vesiculosus), with different structures were assessed on viability in macrophages, RAW 264.7 cells. Both showed cytotoxicity in these cells. We observed high levels of nitric oxide (NO) production, interleukin-6 (IL-6), and tumor necrosis factor-alpha (TNF-α) when treated at 0.25, 0.5, and 1.0 mg mL−1 of LV. Data also suggest that LV has potential antitumor effects on HT-29 and antiinflammatory and immunomodulatory effects on RAW 264.7 cells
Genotoxicity and osteogenic potential of sulfated polysaccharides from Caulerpa prolifera seaweed
(Elsevier, 2018) Chaves Filho, Gildácio Pereira; Sousa, Angélica Fernandes Gurgel de; Câmara, Rafael Barros Gomes da; Rocha, Hugo Alexandre de Oliveira; Medeiros, Silvia Regina Batistuzzo de; Moreira, Susana Margarida Gomes
Marine algae are sources of novel bioactive molecules and present a great potential for biotechnological and biomedical applications. Although green algae are the least studied type of seaweed, several of their biological activities have already been described. Here, we investigated the osteogenic potential of Sulfated Polysaccharide (SP)- enriched samples extracted from the green seaweed Caulerpa prolifera on human mesenchymal stem cells isolated from Wharton jelly (hMSC-WJ). In addition, the potential genotoxicity of these SPs was determined by cytokinesis-block micronucleus (CBMN) assay. SP-enriched samples did not show significant cytotoxicity towards hMSCs-WJ at a concentration of up to 10 μg/mL, and after 72 h of exposure. SP enrichment also significantly increased alkaline phosphatase (ALP) activity, promoting calcium accumulation in the extracellular matrix. Among the SP-enriched samples, the CP0.5 subfraction (at 5 μg/mL) presented the most promising results. In this sample, ALP activity was increased approximately by 60%, and calcium accumulation was approximately 6-fold above the negative control, indicating high osteogenic potential. This subfraction also proved to be non-genotoxic, according to the CBMN assay, as it did not induce micronuclei. The results of this study highlight, for the first time, the potential of these SPs for the development of new therapies for bone regeneration
Heterofucan from Sargassum filipendula induces apoptosis in HeLa cells
(MDPI, 2011-04-14) Costa, Leandro Silva; Telles, Cinthia Beatrice Silva; Oliveira, Ruth Medeiros; Nobre, Leonardo Thiago Duarte Barreto; Dantas-Santos, Nednaldo; Câmara, Rafael Barros Gomes da; Costa, Mariana Santana Santos Pereira; Almeida-Lima, Jailma; Melo-Silveira, Raniere Fagundes; Albuquerque, Ivan Rui Lopes; Leite, Edda Lisboa; Rocha, Hugo Alexandre de Oliveira
Fucan is a term used to denominate a family of sulfated polysaccharides rich in sulfated L-fucose. Heterofucan SF-1.5v was extracted from the brown seaweed Sargassum filipendula by proteolytic digestion followed by sequential acetone precipitation. This fucan showed antiproliferative activity on Hela cells and induced apoptosis. However, SF-1.5v was not able to activate caspases. Moreover, SF-1.5v induced glycogen synthase kinase (GSK) activation, but this protein is not involved in the heterofucan SF-1.5v induced apoptosis mechanism. In addition, ERK, p38, p53, pAKT and NFκB were not affected by the presence of SF-1.5v. We determined that SF-1.5v induces apoptosis in HeLa mainly by mitochondrial release of apoptosis-inducing factor (AIF) into cytosol. In addition, SF-1.5v decreases the expression of anti-apoptotic protein Bcl-2 and increased expression of apoptogenic protein Bax. These results are significant in that they provide a mechanistic framework for further exploring the use of SF-1.5v as a novel chemotherapeutics against human cervical cancer

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