EFAR - Escola de Farmácia
URI permanente desta comunidadehttp://www.hml.repositorio.ufop.br/handle/123456789/451
Notícias
O curso de Farmácia em Ouro Preto foi criado em 1839, sendo a mais antiga Escola de Farmácia da América Latina.
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191 resultados
Resultados da Pesquisa
Item Evaluation of susceptibility of Trichophyton mentagrophytes and Trichophyton rubrum clinical isolates to antifungal drugs using a modified CLSI microdilution method (M38-A).(2007) Barros, Maria Elisabete da Silva; Santos, Daniel de Assis; Hamdan, Júnia SoaresOnychomycosis is a common adult human mycosis, and dermatophytes of the Trichophyton genera are the most common causative agent. Many antimycotic agents are safe and highly effective for the treatment of dermatophytosis, and are available for clinical practice. Successful treatment depends on the ability of antifungal drugs to eradicate the fungal isolates. The aim of this work was to determine the MICs of four antifungal drugs (fluconazole, itraconazole, terbinafine and griseofulvin) recognized for ungual dermatophytosis treatment caused by Trichophyton species, especially Trichophyton mentagrophytes and Trichophyton rubrum. MICs were determined using a broth microdilution method in accordance with Clinical and Laboratory Standards Institute approved standard M38-A with some modifications, such as an incubation temperature of 28 °C, an incubation time of 7 days and inocula constituted of only microconidia. The results showed that the activities of terbinafine and itraconazole were significantly higher (MICs of <0.007–0.031 and 0.015–0.25 μg ml−1, respectively) than other tested agents. All isolates had reduced susceptibility to fluconazole (1–64 μg ml−1). The MIC of griseofulvin varied among strains (MICs of 0.062–1 μg ml−1). The parameters adopted to perform susceptibility testing of T. rubrum and T. mentagrophytes to antifungal agents appeared to be suitable and reliable, and could contribute to the possible development of a standard protocol.Item Benznidazole treatment during early indeterminate Chagas' disease shifted the cytokine expression by innate and adaptive immunity cells toward a type-1 modulated immune profile.(2006) Avelar, Renato Sathler; Avelar, Danielle Marchetti Vitelli; Massara, Rodrigo Lima; Lana, Marta de; Carvalho, Andréa Teixeira de; Dias, João Carlos Pinto; Santos, Silvana Maria Elói; Martins Filho, Olindo AssisTrypanosoma cruzi-infected children was treated with benznidazole (Bz) duringthe early-indeterminate disease (E-IND) and the cytokine pattern of innate andadaptive immune compartments were evaluated prior to the treatment and1 year after it. At first, we observed that the ex vivo cytokine profile of circula-ting leukocytes from E-IND (n ¼ 6) resembled the one observed for healthyschoolchildren (n ¼ 7). Additionally, in vitro stimulation with T. cruzi anti-gens drove the E-IND cytokine pattern toward a mixed immune profile withhigher levels of IFN-c+, TNF-a+and IL-4+NK cells, increased numbers ofIFN-c+, TNF-a+and IL-10+CD4+T cells in addition to enhanced frequencyof TNF-a+/IL-4+CD19+lymphocytes. Interestingly, upon T. cruzi antigen invitro stimulation, E-IND CD8+lymphocytes displayed a selective enhancementof IFN-c expression, accounting for a global type 1-modulated cytokine micro-environment. A shift toward a type 1-modulated profile was also the hallmarkof Bz-treated children (E-INDT). In this context, despite the mixed overall exvivo cytokine profile observed for NK and CD8+T cells, incr eased ability ofthese leukocytes to produce IFN-c in respons e to T. cruzi antigens was repor-ted. Most noteworthy was the IL-10 production evidenced at T lymphocytes,mainly CD4+cells, as well as B lymphocytes, both ex vivo and upon antigenstimulation. Toget her, these findings gave evidence that NK cells and CD8+T lymphocytes are the major sources of IFN-c, a pivotal cytokine for successfultherapeutic response in human Chagas’ disease. Moreover, our data have alsobrought additional information, pointing out IL-10 production by CD4+cellsand B lymphocytes, as the putative key element for parasite clearance in theabsence of deleterious tissue damage.Item Advances in Chagas disease chemotherapy.(2006) Guedes, Paulo Marcos da Matta; Fietto, Juliana Lopes Rangel; Lana, Marta de; Bahia, Maria TerezinhaChagas disease is endemic from Mexico to Argentina, where it is estimated that 16 to 18 million people are infected with its causative agent, Trypanosoma cruzi, and 100 million remain at risk of infection, emphasizing the necessity to sustain and extend control measures and strategies to combat this disease. Specific chemotherapy with benznidazole or nifurtimox has been recommended for treatment of recent and congenital infection. However, clinical trials with nifurtimox and benznidazole have shown that these compounds have very low activity in preventing the development of chronic Chagas disease. Moreover, the drugs induce a number of toxic side effects. The discovery of new active, non-toxic compounds would probably expand treatment, including those patients in which clinical manifestations are absent or can only be disclosed by more elaborate medical procedures. Recent developments in the study of basic biochemical aspects of T. cruzi have allowed for the identification of new targets for chemotherapy. Like many fungi, T. cruzi has a strict requirement for specific endogenous sterol synthesis for cell viability and growth and is extremely susceptible to sterol biosynthesis inhibitors (SBI). An intensive investigation of the potential trypanocidal effect of specific SBI has been performed, and it was demonstrated that some of these compounds exhibited suppressive and curative activity in murine and dog models of acute and chronic Chagas disease. Other potential targets for anti-T. cruzi chemotherapy that include the antiproliferative lysophospholipid analogs (evaluated in clinical trials as the first oral treatment for visceral leishmaniasis), cysteine protease inhibitors and compounds that interfere with purine salvage and inositol metabolism are also discussed.Item Vibrio mimicus from Vibrio cholerae by multilocus enzyme electrophoresis.(2001) Vieira, Verônica V.; Teixeira, Luiz Fernando de Medeiros; Vicente, Ana Carolina Paulo; Momen, Hooman; Salles, Carlos AndréIn this study, we demonstrated that analyzed strains of Vibrio mimicus and Vibrio cholerae could be separated in two groups by using multilocus enzyme electrophoresis (MEE) data from 14 loci. We also showed that the combination of four enzymatic loci enables us to differentiate these two species. Our results showed that the ribosomal intergenic spacer regions PCR-mediated identification system failed, in some cases, to differentiate between V. mimicus and V. cholerae. On the other hand, MEE proved to be a powerful molecular tool for the discrimination of these two species even when atypical strains were analyzed.Item Synthesis of 4-octyl-2H-1,4-benzo-thiazin-3-ones.(2003) Guarda, Vera Lúcia de Miranda; Perrissin, Monique; Thomasson, François; Ximenes, Eulália Camelo Pessoa de Azevedo; Galdino, Suely Lins; Pitta, Ivan da Rocha; Luu-Duc, Cuong; Barbe, JacquesSynthesis, physical and analytical properties of 6-alkylacylamino-4-octyl-2H-1,4-benzo-thiazin-3-ones derivatives are described. These new compounds were prepared by acylation and/or alkylation of the amino group under phase transfer catalysis conditions. Acid hydrolysis of the alkylacylamino-2H-1,4-benzo-thiazin-3-ones afforded N-alkylamino-benzothiazin-3-ones. Some of these compounds were evaluated in vitro for possible bacteriostatic activity.Item Poly (D,L-lactide) nanocapsules prepared by solvent displacement process : influence of composition on physico-chemical and structural properties.(2000) Mosqueira, Vanessa Carla Furtado; Legrand, Philippe; Alphandary, Huguette Pinto; Puisieux, Francis; Barratt, GillianNanocapsules (NC) were prepared by interfacial deposition of preformed biodegradable polymer (PLA50) after a solvent displacement process. The influence of the composition used for the preparation of NC was evaluated in terms of particle size, polydispersity, zeta potential, homogeneity, and structural characteristics of the systems. The nature of the oil phase, polymer molecular weight, type and concentration of different surfactants were investigated to optimize the formulation to obtain NC suitable for intravenous administration. The influence of the physicochemical properties of the different oils used in NC preparation on the NC size was evaluated. The interfacial tension between the oil and water phases seems to have a greater effect on NC size than the oil viscosity. Miglyol 810 and ethyl oleate lead to the formation of smaller NC, probably because of the reduced interfacial tension. The polymer molecular weight plays only a small role in NC surface charge in the presence of lecithin, whereas NC surface charge, size, polydispersity, and short-term stability were highly influenced by lecithin purity. It appears that the absence of poloxamer 188 leads to smaller polydispersity, less contamination with nanospheres, and reduced formation of structures other than NC. Furthermore, electron microscopy and density gradient density techniques were used to examine the structure of the particles formed and their homogeneity. NC formation was evidenced by the bands with intermediate density between nanoemulsion and nanospheres; however, other bands of low intensity were observed. The presence of liposomes and multilayers in NC preparation was confirmed by electron microscopy. The percentage of carboxyfluorescein entrapped in different NC formulations allowed us to estimate the contamination by liposomes. It has been show that, under our experimental conditions, an excess of lecithin is an essential prerequisite for a stable preparation of PLA NC.Item Potencial fitotóxico de Pterodon polygalaeflorus Benth (Leguminosae) sobre Acanthospermum australe (Loefl.) O. Kuntze e Senna occidentalis (L.).(2009) Belinelo, Valdenir José; Vieira Filho, Sidney Augusto; Almeida, Marcelo Suzart de; Alves, Dalton Luiz FerreiraO objetivo dessa pesquisa foi sintetizar e caracterizar a atividade alelopática de derivados do ácido 6α,7β–di-hidroxivouacapan-17β–óico, isolado de sementes de Pterodon polygalaeflorus Benth (Leguminosae). A caracterização dos compostos envolveu espectrometria no infravermelho (IV) e ressonância magnética nuclear de hidrogênio e de carbono (RMN de 1H e de 13C) incluindo experimentos em duas dimensões (COSY 1H 1H, HMQC e HMBC). Os efeitos alelopáticos foram avaliados através de bioensaios de germinação de sementes e crescimento radicular, em condições controladas de temperatura (25 °C) e fotoperíodo (12 h claro/12h escuro), durante 72 horas. Concentrações de 1,0, 100,0 e 1000,0 mg.L-1 foram testadas. Senna occidentalis (fedegoso) e Acanthospermum australe (carrapichinho) foram utilizadas como espécies daninhas alvo. Foi observado que o efeito alelopático dos compostos aumentou em função do aumento da concentração, mostrando assim uma relação dose dependente. A tendência geral observada nos resultados foi de aumento da intensidade dos efeitos alelopáticos inibitórios em função do aumento da concentração. A N-Etil-6α-acetoxi-7β- hidroxivouacapan-17β–amida e N,N-Dietil-6α-acetoxi-7β-hidroxivouacapan-17β–amida foram os derivados que apresentaram maior efeito inibidor da germinação e do crescimento radicular do fedegoso e do carrapichinho. Portanto, esses compostos representam grande potencial aleloquimico contra essas ervas daninha.Item Attainment of O/W emulsions containing liquid crystal from annatto oil (Bixa orellana), coffee oil, and tea tree oil (Melaleuca alternifolia) as oily phase using HLB system and ternary phase diagram.(2008) Morais, Gilsane Garcia; Santos, Orlando David Henrique dos; Oliveira, Wanderley Pereira; Rocha Filho, Pedro Alves daEmulsions containing liquid crystals present interesting properties and advantages such as the skin moisturize increase, active release modulation, and emulsion stabilization. In this work, emulsions containing annatto, coffee and tea tree oils, and nonionic surfactants were developed. The HLB method was used for selection of surfactants. The required HLB value was established (9.0). Liquid crystals were attained when used the surfactant mixture Ceteareth-5 and Steareth-2 and identified as lamellar. The emulsions showed pseudoplastic behavior and tixotropy. The ternary diagram was useful in the selection of the proportion of surfactant and oily phase considering skin compatibility and liquid crystal presence.Item Comparison of bidirectional lamivudine and zidovudine transport using MDCK, MDCK-MDR1, and Caco-2 cell monolayers.(2009) Souza, Jacqueline de; Benet, Leslie Z.; Huang, Yong; Storpirtis, SílviaBidirectional transport studies were conducted using Caco-2, MDCK, and MDCK–MDR1 to determine P-gp influences in lamivudine and zidovudine permeability and evaluate if zidovudine permeability changes with the increase of zidovudine concentration and/or by association of lamivudine. Transport of lamivudine and zidovudine separated and coadministrated across monolayers based on these cells were quantified using LC–MS–MS. Drug efflux by P-gp was inhibited using GG918. Bidirectional transport of lamivudine and zidovudine was performed across MDCK–MDR1 and Caco-2 cells. Statistically significant transport decrease in B!A direction was observed using MDCK–MDR1 for zidovudine and MDCK–MDR1 and Caco-2 for lamivudine. Results show increased transport in B!A and A!B directions as concentration increases but data from Papp increase in both directions for both drugs in Caco-2, decrease in MDCK, and does not change significantly in MDCK–MDR1. Zidovudine transport in A!B direction increases when coadministrated with increasing lamivudine concentration but does not change significantly in B!A direction. Zidovudine and lamivudine are P-gp substrates, but results assume that P-gp does not affect significantly lamivudine and zidovudine. Their transport in monolayers based on Caco-2 cells increase proportionally to concentration (in both directions) and zidovudine transport in Caco-2 cell monolayer does not show significant changes with lamivudine increasing concentrations.Item Purification and characterization of an extracellular trypsin-like protease of Fusarium oxysporum var. lin.(2002) Barata, Ricardo Andrade; Andrade, Milton Hércules Guerra de; Rodrigues, Roberta Dias; Castro, Ieso de MirandaAn alkaline serineprotease, capable of hydrolyzing Nu-benzoyl-DL arginine p-nitroanilide, was secreted by Fusurium oxysporum var. hi grown in the presence of gelatin as the sole nitrogen and carbon source. The protease was purified 65-fold to electrophoretic homogenity from the culture supernatant in a three-step procedure comprising QSepharose chromatography, aMnity chromatography, and FPLC on a MonoQ column. SDS-PAGE analysis of the purified protein indicated an estimated molecular mass of 41 kDa. The protease had optimum activity at a reaction temperature of 45OC and showed a rapid decrease of activity at 48OC. The optimum pH was around 8.0. Characterization of the protease showed that Ca*+ and MgZ+ cations increased the activity, which was not inhibited by EDTA or l,lO-phenanthroline. The enzyme activity on Nubenzoyl-DL arginine p-nitroanilide was inhibited by 4-(2-aminoethyl)-benzenesulfonyl fluoride hydrochloride,p-aminobenzamidine dihydrochloride, aprotinin, 3-4 dichloroisocoumarin, and IVtosyl-L-lysine chloromethyl ketone. The enzyme is also inhibited by substrate concentrations higher than 2.5x lo-4 M. The protease had a Michaelis-Menten constant of 0.16 mM and a V,, of 0.60 pm01 released product .min-‘.mg’ enzyme when assayed in a non-inhibiting substrate concentration. The activity on Nu-benzoyl-DL arginine p-nitroanilide was competitively inhibited by p-aminobenzamidine dihydrochoride. A Ki value of 0.04 mM was obtained.