DBG - Departamento de Biologia Celular e Genética

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Digestive enzymes during development of Ceratitis capitata (Diptera:Tephritidae) and effects of SBTI on its digestive serine proteinase targets
(Insect Biochemistry and Molecular Biology, 2006) Silva, Fatima C. B. L.; Alcazar, Alonso; Macedo, Leonardo L. P.; Oliveira, Adeliana S.; Macedo, Francisco P.; Abreu, Luiz R. D.; Santos, Elizeu A.; Sales, Mauricio P.
Effect of trypsin inhibitor from Crotalaria pallida seeds on Callosobruchus maculatus (cowpea weevil) and Ceratitis capitata (fruit fly)
(Plant Physiology and Biochemistry, 2005-12-07) Gomes, Carlos E. M.; Barbosa, Aulus E. A. D.; Macedo, Leonardo L. P.; Pitanga, Joelma C. M.; Moura, Fabiano T.; Oliveira, Adeliana S.; Moura, Raniere M.; Queiroz, Alexandre F. S.; Macedo, Francisco P.; Andrade, Lúcia B. S.; Vidal, Márcia S.; Sales, Mauricio P.
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
Immunomodulatory effects and antimicrobial activity of heterofucans from Sargassum filipendula
(Springer, 2017-07-18) Telles, Cinthia Beatrice Silva; Mendes-Aguiar, Carolina; Fidelis, Gabriel Pereira; Frasson, Amanda Piccoli; Pereira, Wogelsanger Oliveira; Scortecci, Katia Castanho; Camara, Rafael Barros Gomes; Nobre, Leonardo Thiago Duarte Barreto; Costa, Leandro Silva; Tasca, Tiana; Rocha, Hugo Alexandre de Oliveira
Parasitic diseases are a human health problem mainly in low-income areas. The drugs available for the treatment of these diseases are far from satisfactory due to high costs, toxicity, and drug resistance. Sulfated polysaccharides are a complex group of bioactive polymers and can be obtained from seaweeds. The heterofucans from Sargassum filipendula (SF) present strong antiproliferative and antioxidant activities. However, their immunomodulatory and antimicrobial capacity have not been evaluated until now. In this study, five sulfated fucose-rich fractions were isolated (named SF0.5V, SF0.7V, SF1.0V, SF1.5V, and SF2.0V). The chemical composition showed slight differences among polysaccharides and, consequently, biological activity of these polymers. Three fractions (SF0.5V, SF0.7V, and SF1.0V) showed a strong immunomodulatory activity enhancing the release of nitric oxide (NO) by murine macrophages (RAW 264.7), though only SF0.5V was able to induce interleukin-6 (IL-6) and TNF-α release from RAW cells. The sugar to sulfate ratio was not correlated with these activities. Meanwhile, the contents of xylose (P = 0.98 for NO; P = 0.98 for IL-6; P = 0.96 for TNF-α) and glucuronic acid (P = 0.91 for NO; P = 0.9190 for IL-6; P = 0.79 for TNF-α) were strongly positively correlated. SF0.7V and SF1.0V inhibited biofilm formation by Klebsiella pneumoniae (4.2 and 6.8%, respectively), whereas SF0.5V showed inhibitory effect (~50%) on biofilm formation by Staphylococcus epidermidis. Furthermore, SF0.7V and SF1.0V showed high inhibition capacity on the survival of the protozoan Trichomonas vaginalis. The sugar to sulfate ratio was positively correlated (P = 0.60) with this activity. The results demonstrate the spectrum of action of these sulfated polysaccharides obtained from SF and show their potential as immunomodulatory and microbicidal agents
Influence of culture medium on the production of eif antigen from Leishmania chagasi in recombinant Escherichia coli
(Sociedade Brasileira de Microbiologia, 2011-12) Santos, Everaldo Silvino dos; Vaz, Michelle Rossana Ferreira; França, Ricardo Luiz Soares de; Andrade, Sirtys Santos Lessa de; Sousa Junior, Francisco Canindé de; Martins, Daniella Regina Arantes; Macedo, Gorete Ribeiro de
With the advent of recombinant DNA technology, recombinant protein expression has become an important tool in the study of the structure, function and identification of new proteins, especially those with therapeutic functions. Escherichia coli has been the predominant prokaryote used in genetic engineering studies due to the abundance of information about its metabolism. Despite significant advances in molecular biology and immunology of infections, there are as yet no prophylactic drugs capable of preventing visceral leishmaniasis. It is therefore important to identify specific antigens in order to develop vaccines and diagnostic kits against this disease. The objective of this study was to evaluate the influence of culture medium on the production of eIF antigen from Leishmania chagasi in recombinant Escherichia coli. An induction procedure using IPTG was carried out in a series of trials, to observe the influence of culture medium (2xTY, TB) under expression of the recombinant eIF protein. Results showed that recombinant protein expression was associated to growth and that the highest eIF antigen expression was obtained in the 2xTY medium
Invasive fungal infection by Cryptococcus neoformans var. grubii with bone marrow and meningeal involvement in a HIV infected patient: a case report
(BMC, 2019-03) Vechi, Hareton Teixeira; Theodoro, Raquel Cordeiro; Oliveira, Andrea Lima de; Gomes, Ronald Muryellison Oliveira da Silva; Soares, Rodolfo Daniel de Almeida; Freire, Munya Gandour; Bay, Mônica Baumgardt
Background: Cryptococcosis is a common opportunistic infection in patients infected by Human Immunodeficiency Virus (HIV) and is the second leading cause of mortality in Acquired Immunodeficiency Syndrome (AIDS) patients worldwide. The most frequent presentation of cryptococcal infection is subacute meningitis, especially in patients with a CD4+ T Lymphocytes count below 100 cells/μL. However, in severely immunosuppressed individuals Cryptococcus neoformans can infect virtually any human organ, including the bone marrow, which is a rare presentation of cryptococcosis. Case presentation: A 45-year-old HIV-infected male patient with a CD4+ T lymphocyte count of 26 cells/μL who presented to the emergency department with fever and pancytopenia. Throughout the diagnostic evaluation, the bone marrow aspirate culture yielded encapsulated yeasts in budding, identified as Cryptococcus sp. The bone marrow biopsy revealed a hypocellularity for age and absence of fibrosis. It was observed presence of loosely formed granuloma composed of multinucleated giant cells encompassing rounded yeast like organisms stained with mucicarmine, compatible with Cryptococcus sp. Then, the patient underwent a lumbar puncture to investigate meningitis, although he had no neurological symptoms and neurological examination was normal. The cerebrospinal fluid culture yielded Cryptococcus sp. The species and genotype identification step showed the infection was caused by Cryptococcus neoformans var. grubii (genotype VNI). The patient was initially treated with amphotericin B deoxycholate plus fluconazole for disseminated cryptococcosis, according to guideline recommendations. However, the patient developed acute kidney injury and the treatment was switched for fluconazole monotherapy. The symptoms disappeared completely with recovery of white blood cells and platelets counts. Cerebrospinal fluid cultures for fungi at one and two-weeks of treatment were negative. Conclusions: Bone marrow infection caused by Cryptococcus neoformans is a rare presentation of cryptococcosis. The cryptococcal infection should be included for differential diagnosis in HIV-infected patients with fever and cytopenias, especially when CD4+ T lymphocytes count is below 100 cells/μL.
Manutenção da Heterozigosidade em populações de plantas autógamas
(1992-03) Gouveia, Mílson Bezerra
Molecular modelling and quantum biochemistry computations of a naturally occurring bioremediation enzyme: Alkane hydroxylase from Pseudomonas putida P1
(Elsevier, 2017-10) Sousa, Bruno Gomes de; Oliveira, Jonas Ivan Nobre; Albuquerque, Eudenilson Lins de; Fulco, Umberto Laico; Amaro, Venerando Eustáquio; Blaha, Carlos Alfredo Galindo
Many species of bacteria involved in degradation of n-alkanes have an important constitutional metabolic enzyme, the alkane hydroxylase called AlkB, specialized in the conversion of hydrocarbons molecules that can be used as carbon and/or energy source. This enzyme plays an important role in the microbial degradation of oil, chlorinated hydrocarbons, fuel additives, and many other compounds. A number of these enzymes has been biochemically characterized in detail because the potential of alkane hydroxylases to catalyse high added-value reactions is widely recognized. Nevertheless, the industrial and process bioremediation application of them is restricted, owing to their complex biochemistry, challenging process requirements, and the limited number of their three-dimensional structures. Furthermore, AlkB has great potential as biocatalysts for selective transformation of a wide range of chemically inert unreactive alkanes into reactive chemical precursors that can be used as tools for bioremediation and bioprocesses. Aiming to understand the possible ways the AlkB enzyme Pseudomonas putida P1 interacts with octane, octanol and 1-octyne, we consider its suitable biochemical structure taking into account a 3-D homology modelling. Besides, by using a quantum chemistry computational model based on the density functional theory (DFT), we determine possible protein-substrate interaction regions measured by means of its binding energy simulated throughout the Molecular Fractionation with Conjugated Caps (MFCC) approach
Novel antibacterial silver coating on PET fabric assisted with hollow-cathode glow discharge
(Wiley, 2020-07-30) Nascimento, Rubens Maribondo do; Naeem, Muhammad; Felipe, M. B. M. C.; Medeiros, Silvia Regina Batistuzzo de; Costa, Thércio Henrique de Carvalho; Libório, Maxwell Santana; Alves Júnior, Clodomiro; Nascimento, Igor Oliveira; Sousa, R. R. M.; Feitor, Michelle Cequeira
The silver-coated fabrics are of much importance because of their outstanding antibacterial features and are useable in several medical and hygienic applications. The silver deposition on fabrics by conventional techniques is not feasible because of their high processing cost, long processing duration, complex equipment, and multiple steps processing (nanoparticle synthesis and subsequent deposition on fabrics). In this novel study, the antibacterial silver coating is deposited by using a hollow cathode discharge (HCD) capable of generating high-density plasma, and thus it exhibits high-efficiency processing. The silver is deposited on woven and non-woven PET fabrics for various treatment times (10-60 minutes), and their antibacterial performance against E. coli and S. aureus bacterial is tested. The XRD results verified the deposition of silver with (111) preferred orientation, while SEM analysis depicted the uniform/ homogeneous deposition of silver particles. The interfacial free energy of adhesion depicts that after the silver deposition on both fabrics, the surface is actively unfavorable for bacterial adhesion. The antibacterial test revealed that the silver-coated woven and non-woven PET fabrics exhibit exceptional antibacterial activity against E. coli and S. aureus bacteria. As the HCD technique is relatively cost-effective, no need for specific sputtering targets, eco-friendly, and require single-step processing for silver deposition. Thus the results are expected to be of remarkable importance to prepare silver-coated antibacterial fabrics useable in hospitals and other appropriate applications
Piolho: um invasor entre nós
(SEDIS-UFRN, 2024-08-21) Lima, Lucimar Fernandes de; Lima, Ingrid Bezerra da Silva; Lima, Roberto Rodrigues Cunha; Medeiros, Silvia Regina Batistuzzo de
Com a perspectiva de contribuir com informações direcionadas ao público jovem a respeito da infestação de piolhos, este trabalho traz orientações sobre cuidados, tratamentos e o que deve ser evitado quando percebida essa situação tão recorrente e que atinge, sobretudo, as comunidades escolares.
The Bisindole Alkaloid Caulerpin, from seaweeds of the Genus Caulerpa, attenuated colon damage in murine colitis model
(MDPI, 2018-09-07) Lucena, Alessandra Marinho Miranda; Souza, Cássio R. M.; Jales, Jéssica T.; Guedes, Paulo Marcos da Matta; Miranda, George E. C. de; Moura, Adolpho M. A. de; Araújo-Júnior, João X.; Nascimento, George J.; Scortecci, Kátia Castanho; Santos, Barbara V. O.; Souto, Janeusa Trindade de
Caulerpin (CLP), an alkaloid from algae of the genus Caulerpa, has shown anti-inflammatory activity. Therefore, this study aimed to analyze the effect of CLP in the murine model of peritonitis and ulcerative colitis. Firstly, the mice were submitted to peritonitis to evaluate which dose of CLP (40, 4, or 0.4 mg/kg) could decrease the inflammatory infiltration in the peritoneum. The most effective doses were 40 and 4 mg/kg. Then, C57BL/6 mice were submitted to colitis development with 3% dextran sulfate sodium (DSS) and treated with CLP at doses of 40 and 4 mg/kg. The disease development was analyzed through the disease activity index (DAI); furthermore, colonic tissue samples were submitted to histological analysis, NFκB determination, and in vitro culture for cytokines assay. Therefore, CLP at 4 mg/kg presented the best results, triggering improvement of DAI and attenuating the colon shortening and damage. This dose was able to reduce the TNF-α, IFN-γ, IL-6, IL-17, and NFκB p65 levels, and increased the levels of IL-10 in the colon tissue. Thus, CLP mice treatment at a dose of 4 mg/kg showed promising results in ameliorating the damage observed in the ulcerative colitis
Use of plasmids for expression of proteins from the genus Leishmania in Escherichia coli: current state and perspectives
(Springer-Verlag GmbH Germany, 2020-03-25) Santos, Everaldo Silvino dos; Ribeiro, Vitor Troccoli; Leitão, Ana Laura Oliveira de Sá; Vasconcelos, Luan Tales Costa de Paiva; Oliveira Filho, Marcos Antônio; Martins, Daniella Regina Arantes; Sousa Júnior, Francisco Canindé de
Leishmaniosis is caused by the protozoa of the genus Leishmania with a wide spectrum of clinical and epidemiological manifestations which are characterized into four clinical groups: cutaneous, mucocutaneous, diffuse cutaneous, and visceral. American visceral leishmaniosis (AVL) or visceral leishmaniosis (VL) has been known as the most severe form of the disease. However, despite the growing number of people exposed to the infection risk and the great effort done by the scientific community worldwide to significantly increase the knowledge about these diseases, there is no vaccine capable of preventing VL in humans. In this short review, we present some of the plasmids used for the expression of recombinant protein by Escherichia coli strains used mainly for the second generation of vaccines for leishmaniosis. It can be emphasized that currently, these vectors and hosts play an important role in developing vaccine strategies against the disease. Indeed, use of the E. coli BL21 (DE) strain is remarkable mainly due to its characteristics for being a stable protein producer as well as the use of histidine tags for antigen purification

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