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.

Navegar

Resultados da Pesquisa

Agora exibindo 1 - 10 de 95
  • Item
    Effect on cellular recruitment and the innate immune response by combining saponin, monophosphoryl lipid-A and incomplete freund’s adjuvant with Leishmania (Viannia) braziliensis antigens for a vaccine formulation.
    (2019) Souza, Juliana Vitoriano de; Mathias, Fernando Augusto Siqueira; Moreira, Nádia das Dores; Soares, Rodrigo Dian de Oliveira Aguiar; Vieira, Paula Melo de Abreu; Carvalho, Andréa Teixeira de; Carneiro, Cláudia Martins; Giunchetti, Rodolfo Cordeiro; Brito, Rory Cristiane Fortes de; Fujiwara, Ricardo Toshio; Roatt, Bruno Mendes; Melo, Maria Norma; Reis, Alexandre Barbosa
    The poor immunogenicity displayed by some antigens has encouraged the development of strategies to improve the immune response and safety of vaccine candidates, resulting in an intense search for substances that potentiate vaccine response. Adjuvants have these properties helping vaccine candidates to induce a strong, durable, and fast immune response. In this study, we evaluated the specific immune response of adjuvants alone, Saponin (SAP), Incomplete Freund’s Adjuvant (IFA) and Monophosphoryl lipid-A SE (MPL-SE ) and in combination with total antigen of L. braziliensis (LB): LBSAP, LBIFA and LBMPL. The specific immune response induced by these compositions demonstrated that they were powerfully immunogenic, increasing cellular infiltration in the skin. Draining lymph nodes cultures showed that LBIFA and LBMPL have higher ability to increase the capacity of APCs to present antigens, with increased frequency of CD11c+ CD86+ cells. SAP, MPL, LBSAP, LBIFA and LBMPL could activate lymphocytes increasing expression of CD69 and CD25. LBSAP group was an excellent inducer of pro-inflammatory cytokines at 24 h. At 48 h, higher cytokines production was observed in IFA, LBIFA, MPL and LBMPL groups. Our data demonstrate that LBSAP and LBMPL are potential formulations to be tested in other experimental models. Also, the data obtained could expand the knowledge about immune response after sensitization and also contribute to the development of safe, immunogenic and effective vaccines.
  • Item
    Synthetic peptides elicit strong cellular immunity in Visceral Leishmaniasis natural reservoir and contribute to long-lasting polyfunctional T-cells in BALB/c mice.
    (2019) Brito, Rory Cristiane Fortes de; Cardoso, Jamille Mirelle de Oliveira; Reis, Levi Eduardo Soares; Mathias, Fernando Augusto Siqueira; Soares, Rodrigo Dian de Oliveira Aguiar; Carvalho, Andréa Teixeira de; Roatt, Bruno Mendes; Oliveira, Rodrigo Corrêa de; Ruiz, Jeronimo Conceição; Resende, Daniela de Melo; Reis, Alexandre Barbosa
    Reverse vaccinology or immunoinformatics is a computational methodology which integrates data from in silico epitope prediction, associated to other important information as, for example, the predicted subcellular location of the proteins used in the design of the context of vaccine development. This approach has the potential to search for new targets for vaccine development in the predicted proteome of pathogenic organisms. To date, there is no effective vaccine employed in vaccination campaigns against visceral leishmaniasis (VL). For the first time, herein, an in silico, in vitro, and in vivo peptide screening was performed, and immunogenic peptides were selected to constitute VL peptide-based vaccines. Firstly, the screening of in silico potential peptides using dogs naturally infected by L. infantum was conducted and the peptides with the best performance were selected. The mentioned peptides were used to compose Cockt-1 (cocktail 1) and Cockt-2 (cocktail 2) in combination with saponin as the adjuvant. Therefore, tests for immunogenicity, polyfunctional T-cells, and the ability to induce central and effector memory in T-lymphocytes capacity in reducing the parasite load on the spleen for Cockt-1 and Cockt-2 were performed. Among the vaccines under study, Cockt-1 showed the best results, eliciting CD4+ and CD8+ polyfunctional T-cells, with a reduction in spleen parasitism that correlates to the generation of T CD4+ central memory and T CD8+ effector memory cells. In this way, our findings corroborate the use of immunoinformatics as a tool for the development of future vaccines against VL.
  • Item
    Multiplex flow cytometry serology to diagnosis of canine visceral leishmaniasis.
    (2019) Ker, Henrique Gama; Vital, Wendel Coura; Valadares, Diogo Garcia; Soares, Rodrigo Dian de Oliveira Aguiar; Brito, Rory Cristiane Fortes de; Veras, Patrícia Sampaio Tavares; Fraga, Deborah Bittencourt Mothé; Martins Filho, Olindo Assis; Carvalho, Andréa Teixeira de; Reis, Alexandre Barbosa
    An accurate diagnosis of visceral leishmaniasis is an essential tool for control of the disease. While serologic methods are very useful, these conventional methodologies still present limitations in terms of sensitivity and specificity. The use of flow cytometry is a worldwide trend in the development of high-performance diagnostic methods. Herein, we describe a new flow cytometry serology test, characterized by the employment of the Cytometric Bead Array microspheres A4 and E4 coated with the recombinant antigens rLci1A and rLci2B respectively, to improve the serodiagnosis of canine visceral leishmaniasis. The tests were conducted in a wide variety of sera groups (n = 140), where the diagnostics development would be optimized accounting not just the ability to identify infected dogs with different clinical status, but also to exclude cross-reaction and differentiate vaccinated dogs from dogs infected. Serological testing of the antigenic system A4–rLci1A showed a sensitivity of 90.0% and specificity of 75%, while the E4–rLci2B testing demonstrated a sensitivity of 95.0% and specificity of 82.5%. The use of a multiplex assay of A4–rLci1A and E4–rLci2B, resulted in a diagnostic improvement, with a sensitivity of 95.0% and specificity of 91.2%. Our results show that this novel flow cytometry serology test is a viable tool for sensitive and specific serodiagnosis. Notably, the combination of distinct antigenic systems allows us to test for antibodies to multiple recombinant antigens from a single serum sample. This benefit emphasizes the importance of this methodology as an alternative in the serological diagnosis.
  • Item
    Performance of recombinant chimeric proteins in the serological diagnosis of Trypanosoma cruzi infection in dogs.
    (2019) Leony, Leonardo Maia; Freitas, Natália Erdens Maron de; Del-Rei, Rodrigo Pimenta; Carneiro, Cláudia Martins; Reis, Alexandre Barbosa; Jansen, Ana Maria; Xavier, Samanta Cristina das Chagas; Gomes, Yara Miranda; Silva, Edimilson Domingos da; Reis, Mitermayer Galvão dos; Fraga, Deborah Bittencourt Mothé; Celedon, Paola Alejandra Fiorani; Zanchin, Nilson Ivo Tonin; Torres, Filipe Dantas; Santos, Fred Luciano Neves
    Background: Dogs are considered sentinels in areas of Trypanosoma cruzi transmission risk to humans. ELISA is generally the method of choice for diagnosing T. cruzi exposure in dogs, but its performance substantially depends on the antigenic matrix employed. In previous studies, our group has developed four chimeric antigens (IBMP-8.1, 8.2, 8.3, and 8.4) and evaluated their potential for diagnosing T. cruzi exposure in humans. For human sera, these chimeric antigens presented superior diagnostic performances as compared to commercial tests available in Brazil, Spain, and Argentina. Therefore, in this study we have evaluated the potential of these antigenic proteins for detection of anti-T. cruzi IgG antibodies in dog sera. Methodology/Principal findings: The IBMP-ELISA assays were optimized by checkerboard titration. Subsequently, the diagnostic potential was validated through analysis of ROC curves and the performance of the tests was determined using double entry tables. Cross-reactivity was also evaluated for babesiosis, ehrlichiosis, dirofilariosis, anaplasmosis, and visceral leishmaniasis. Best performance was shown by IBMP-8.3 and IBMP-8.4, although all four antigens demonstrated a high diagnostic performance with 46 positive and 149 negative samples tested. IBMP-8.3 demonstrated 100% sensitivity, followed by IBMP-8.4 (96.7–100%), IBMP-8.2 (73.3–87.5%), and IBMP-8.1 (50–100%). The highest specificities were achieved with IBMP-8.2 (100%) and IBMP-8.4 (100%), followed by IBMP-8.3 (96.7–97.5%) and IBMP 8.1 (89.1–100%). Conclusions/Significance: The use of chimeric antigenic matrices in immunoassays for anti-T. cruzi IgG antibody detection in sera of infected dogs was shown to be a promising tool for veterinary diagnosis and epidemiological studies. The chimeric antigens used in this work allowed also to overcome the common hurdles related to serodiagnosis of T. cruzi infection, especially regarding variation of efficiency parameters according to different strains and cross-reactivity with other infectious diseases.
  • Item
    Leishmania infantum nucleoside triphosphate diphosphohydrolase 1 (NTPDase 1) B-domain : antibody antiproliferative effect on the promastigotes and IgG subclass responses in canine visceral leishmaniasis.
    (2019) Maia, Ana Carolina Ribeiro Gomes; Porcino, Gabriane Nascimento; Pinto, Priscila de Faria; Mendes, Túlio Vieira; Antinarelli, Luciana Maria Ribeiro; Coimbra, Elaine Soares; Reis, Alexandre Barbosa; Juliano Neto, Luiz; Juliano, Maria Aparecida; Marques, Marcos José; Vasconcelos, Eveline Gomes
    A nucleoside triphosphate diphosphohydrolase-1 (NTPDase 1) was identified on the surface, flagellum and kinetoplast from L. infantum promastigotes by immunocytochemistry and confocal laser scanning microscopy, using immune sera that recognized specifically the B domain of NTPDase 1 and produced against synthetic peptides (LbB1LJ and LbB2LJ) derived from this domain. The polyclonal antibodies had effective antileishmanial effect, reducing significantly in vitro promastigotes growth (21–25%), an antiproliferative effect also demonstrated by immune sera produced against recombinant r-pot B domain, and two other synthetic peptides (potB1LJ and potB2LJ). In addition, using these biomolecules in ELISA technique, IgG1 and IgG2 subclasses reactivities of either healthy dogs or infected by L. infantum and classified clinically as asymptomatic, oligosymptomatic and symptomatic were tested. Analysis of distinct IgG1 and IgG2 seropositivities patterns suggested antibody subclasses binding epitopes along B domain for protection against infection, indicating this domain as a new tool for prophylactic and immunotherapeutic investigations.
  • Item
    Canine visceral leishmaniasis biomarkers and their employment in vaccines.
    (2019) Giunchetti, Rodolfo Cordeiro; Silveira, Patricia; Resende, Lucilene Aparecida; Leite, Jaqueline Costa; Melo Júnior, Otoni Alves de Oliveira; Alves, Marina Luiza Rodrigues; Costa, Laís Moreira; Lair, Daniel Ferreira; Chaves, Vinícius Rossi; Soares, Ingrid dos Santos; Mendonça, Ludmila Zanandreis de; Lanna, Mariana Ferreira; Ribeiro, Helen Silva; Gonçalves, Ana Alice Maia; Santos, Thaiza Aline Pereira; Roatt, Bruno Mendes; Soares, Rodrigo Dian de Oliveira Aguiar; Souza, Juliana Vitoriano de; Moreira, Nádia das Dores; Siqueira, Fernando Augusto Mathias; Cardoso, Jamille Mirelle de Oliveira; Vital, Wendel Coura; Galdino, Alexsandro Sobreira; Viana, Kelvinson Fernandes; Martins Filho, Olindo Assis; Lemos, Denise da Silveira; Dutra, Walderez Ornelas; Reis, Alexandre Barbosa
    The natural history of canine visceral leishmaniasis (CVL) has been well described, particularly with respect to the parasite load in different tissues and immunopathological changes according to the progression of clinical forms. The biomarkers evaluated in these studies provide support for the improvement of the tools used in developing vaccines against CVL. Thus, we describe the major studies using the dog model that supplies the rationale for including different biomarkers (tissue parasitism, histopathology, hematological changes, leucocytes immunophenotyping, cytokines patterns, and in vitro co-culture systems using purified T-cells subsets and macrophages infected with L. infantum) for immunogenicity and protection evaluations in phases I and II applied to pre-clinical and clinical vaccine trials against CVL. The search for biomarkers related to resistance or susceptibility has revealed a mixed cytokine profile with a prominent proinflammatory immune response as relevant for Leishmania replication at low levels as observed in asymptomatic dogs (highlighted by high levels of IFN-γ and TNF-α and decreased levels in IL-4, TGF-β and IL-10). Furthermore, increased levels in CD4+ and CD8+ T-cell subsets, presenting intracytoplasmic proinflammatory cytokine balance, have been associated with a resistance profile against CVL. In contrast, a polyclonal B-cell expansion towards plasma cell differentiation contributes to high antibody production, which is the hallmark of symptomatic dogs associated with high susceptibility in CVL. Finally, the different studies used to analyze biomarkers have been incorporated into vaccine immunogenicity and protection evaluations. Those biomarkers identified as resistance or susceptibility markers in CVL have been used to evaluate the vaccine performance against L. infantum in a kennel trial conducted before the field trial in an area known to be endemic for visceral leishmaniasis. This rationale has been a guiding force in the testing and selection of the best vaccine candidates against CVL and provides a way for the veterinary industry to register commercial immunobiological products.
  • Item
    Neutrophil properties in healthy and Leishmania infantum-naturally infected dogs.
    (2019) Wardini, Amanda Brito; Silva, Lucia Helena Pinto da; Nadaes, Natalia Rocha; Nascimento, Michelle Tanny Cunha do; Roatt, Bruno Mendes; Reis, Alexandre Barbosa; Viana, Kelvinson Fernandes; Giunchetti, Rodolfo Cordeiro; Saraiva, Elvira Maria
    Visceral leishmaniasis is a chronic disease that afects humans and dogs as well. Dogs, the domestic reservoir of Leishmania, play a central role in the transmission of visceral leishmaniasis, the most severe form of this disease. Neutrophils are the most abundant leukocytes in blood and interact with the parasite after infection. Here, we evaluate the efector properties of neutrophils from healthy and naturally Leishmania infantum-infected dogs. Our results showed that the parasite induced neutrophil extracellular trap (NET) release from neutrophils in both groups. Additionally, phagocytosis and NETs contributed diferently to parasite killing by neutrophils from healthy and infected animals, and IFN-γ, IL-8, IL-4 and TNF-α production by neutrophils from both groups were diferentially modulated by the parasite. Our results contribute to a better understanding of the complex role played by neutrophils in canine visceral leishmaniasis, which may favor the development of more efective therapies.
  • Item
    Mixed formulation of conventional and pegylated meglumine antimoniate-containing liposomes reduces inflammatory process and parasite burden in Leishmania infantum-infected BALB/c mice.
    (2017) Reis, Levi Eduardo Soares; Brito, Rory Cristiane Fortes de; Cardoso, Jamille Mirelle de Oliveira; Mathias, Fernando Augusto Siqueira; Soares, Rodrigo Dian de Oliveira Aguiar; Carneiro, Cláudia Martins; Vieira, Paula Melo de Abreu; Ramos, Guilherme Santos; Frezard, Frederic Jean Georges; Roatt, Bruno Mendes; Reis, Alexandre Barbosa
    Pentavalent antimonial has been the first choice treatment for visceral leishmaniasis; however, it has several side effects that leads to low adherence to treatment. Liposome-encapsulated meglumine antimoniate (MA) arises as an important strategy for chemotherapy enhancement. We evaluated the immunopathological changes using the mixture of conventional and pegylated liposomes with MA. The mice were infected with Leishmania infantum and a single-dose treatment regimen. Comparison was made with groups treated with saline, empty liposomes, free MA, and a liposomal formulation of MA (Lipo MA). Histopathological analyses demonstrated that animals treated with Lipo MA showed a significant decrease in the inflammatory process and the absence of granulomas. The in vitro stimulation of splenocytes showed a significant increase of gamma interferon (IFN-γ) produced by CD8+ T cells and a decrease in interleukin-10 (IL-10) produced by CD4+ and CD8+ T cells in the Lipo MA. Furthermore, the Lipo MA group showed an increase in the IFN-γ/IL-10 ratio in both CD4+ and CD8+ T cell subsets. According to the parasite load evaluation using quantitative PCR, the Lipo MA group showed no L. infantum DNA in the spleen (0.0%) and 41.4% in the liver. In addition, we detected a low positive correlation between parasitism and histopathology findings (inflammatory process and granuloma formation). Thus, our results confirmed that Lipo MA is a promising antileishmanial formulation able to reduce the inflammatory response and induce a type 1 immune response, accompanied by a significant reduction of the parasite burden into hepatic and splenic compartments in treated animals.
  • Item
    Label-free electrochemical impedance immunosensor based on modified screen-printed gold electrodes for the diagnosis of canine visceral leishmaniasis.
    (2019) Cordeiro, Taís Aparecida Reis; Gonçalves, Marcus Vinícius do Carmo; Franco, Diego Leoni; Reis, Alexandre Barbosa; Martins, Helen Rodrigues; Ferreira, Lucas Franco
    Leishmaniasis is a disease with high impact on public health in many countries. Visceral leishmaniasis (VL) is a vectorial zoonosis, with dogs as primary reservoirs in the domestic environment. VL presents high morbidity, mortality and importance in epidemiology in the American continent. In the present study, the first label-free electrochemical impedance immunosensor using screen-printed electrodes (SPEs) for the detection of anti-Leishmania infantum antibodies was developed. The soluble antigens of L. infantum were immobilized on an SPE by a 3-mercaptopropionic acid monolayer. Electrochemical impedance spectroscopy (EIS) was used for detecting bimolecular interactions occurring at the electrode surface. The addition of real samples consisting of canine and human sera positive and negative for VL presented high sensitivity and selectivity through EIS. Based on the results, a sensitive, specific, rapid and simple immunosensor was developed successfully with potential application for the serological diagnosis of leishmaniasis disease.
  • Item
    Peptide vaccines for leishmaniasis.
    (2018) Brito, Rory Cristiane Fortes de; Cardoso, Jamille Mirelle de Oliveira; Reis, Levi Eduardo Soares; Vieira, João Filipe Pereira; Mathias, Fernando Augusto Siqueira; Roatt, Bruno Mendes; Soares, Rodrigo Dian de Oliveira Aguiar; Ruiz, Jeronimo Conceição; Resende, Daniela de Melo; Reis, Alexandre Barbosa
    Due to an increase in the incidence of leishmaniases worldwide, the development of new strategies such as prophylactic vaccines to prevent infection and decrease the disease have become a high priority. Classic vaccines against leishmaniases were based on live or attenuated parasites or their subunits. Nevertheless, the use of whole parasite or their subunits for vaccine production has numerous disadvantages. Therefore, the use of Leishmania peptides to design more specific vaccines against leishmaniases seems promising. Moreover, peptides have several benefits in comparison with other kinds of antigens, for instance, good stability, absence of potentially damaging materials, antigen low complexity, and low-cost to scale up. By contrast, peptides are poor immunogenic alone, and they need to be delivered correctly. In this context, several approaches described in this review are useful to solve these drawbacks. Approaches, such as, peptides in combination with potent adjuvants, cellular vaccinations, adenovirus, polyepitopes, or DNA vaccines have been used to develop peptide-based vaccines. Recent advancements in peptide vaccine design, chimeric, or polypeptide vaccines and nanovaccines based on particles attached or formulated with antigenic components or peptides have been increasingly employed to drive a specific immune response. In this review, we briefly summarize the old, current, and future stands on peptide-based vaccines, describing the disadvantages and benefits associated with them. We also propose possible approaches to overcome the related weaknesses of synthetic vaccines and suggest future guidelines for their development.