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Pereira JAL, de Moraes LS, de Sena CBC, do Nascimento JLM, Rodrigues APD, da Silva SHM, Silva EO. Inhibition of Melanization by Kojic Acid Promotes Cell Wall Disruption of the Human Pathogenic Fungus Fonsecaea sp. Pathogens 2022; 11:pathogens11080925. [PMID: 36015045 PMCID: PMC9414132 DOI: 10.3390/pathogens11080925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 08/05/2022] [Accepted: 08/11/2022] [Indexed: 11/16/2022] Open
Abstract
Chromoblastomycosis (CBM) is a chronic human subcutaneous mycosis caused by various aetiologic agents. CBM does not have an established treatment but may be managed using antifungal agents, surgical removal of the lesions, or cryotherapy. Kojic acid (KA), a known tyrosinase inhibitor with a variety of biological actions, including fungistatic action against the fungus Cryptococcus neoformans, mediated by inhibiting melanin production, seems to be an alternative to improve the treatment of CBM. The aim of the present study was to analyze the action of KA against the pathogenic fungus Fonsecaea sp., an aetiological agent of CBM. The fungal culture was incubated with KA, and the amount of melanin was assessed, followed by cytochemical detection. Subsequently, the samples were analyzed by light microscopy, transmission and scanning electron microscopy. Culture analysis revealed that 100 g/mL KA significantly decreased the melanization of the fungus and the exocytosis of melanin into the culture supernatant. Additionally, KA induced less growth of biofilm formation and intense disruption of the cell wall, and decreased the number of melanin-containing vesicles in the culture supernatant. Finally, KA inhibited fungal filamentation in culture and the subsequent phagocytosis process. Thus, KA may be a promising substance to help in the treatment of CBM.
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Affiliation(s)
- Jorge Augusto Leão Pereira
- Laboratory of Structural Biology, Institute of Biological Sciences, Federal University of Pará, Belém 66075-110, PA, Brazil
| | - Lienne Silveira de Moraes
- Laboratory of Structural Biology, Institute of Biological Sciences, Federal University of Pará, Belém 66075-110, PA, Brazil
- National Institute of Science and Technology in Structural Biology and Bioimaging, Rio de Janeiro 21040-900, RJ, Brazil
- Pharmaceutical Sciences Post Graduation Program, Health and Biological Sciences Department, Federal University of Amapa (UNIFAP), Macapá 68903-329, AP, Brazil
| | - Chubert Bernardo Castro de Sena
- Laboratory of Structural Biology, Institute of Biological Sciences, Federal University of Pará, Belém 66075-110, PA, Brazil
- National Institute of Science and Technology in Neuroimmunomodulation (INCT—NIM), Rio de Janeiro 21040-900, RJ, Brazil
| | - José Luiz Martins do Nascimento
- Pharmaceutical Sciences Post Graduation Program, Health and Biological Sciences Department, Federal University of Amapa (UNIFAP), Macapá 68903-329, AP, Brazil
- National Institute of Science and Technology in Neuroimmunomodulation (INCT—NIM), Rio de Janeiro 21040-900, RJ, Brazil
- Laboratory of Molecular and Cellular Neurochemistry, Institute of Biological Sciences, Federal University of Pará, Belém 66075-110, PA, Brazil
| | - Ana Paula D. Rodrigues
- National Institute of Science and Technology in Structural Biology and Bioimaging, Rio de Janeiro 21040-900, RJ, Brazil
- Laboratory of Electron Microscopy, Evandro Chagas Institute, Ministry of Health, Belém 66093-020, PA, Brazil
| | - Silvia Helena Marques da Silva
- Laboratory of Superficial and Systemic Mycoses, Evandro Chagas Institute, Department of Mycology and Bacteriology, Ministry of Health, Ananindeua 67030-000, PA, Brazil
| | - Edilene O. Silva
- Laboratory of Structural Biology, Institute of Biological Sciences, Federal University of Pará, Belém 66075-110, PA, Brazil
- National Institute of Science and Technology in Structural Biology and Bioimaging, Rio de Janeiro 21040-900, RJ, Brazil
- Correspondence: ; Tel.: +055-9132-0175-46
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Turiel-Silva M, Wendt C, Silva EO, Rodrigues APD, de Souza W, Miranda K, Diniz J. Three-dimensional Architecture of Cyrilia lignieresi Gametocyte-stage Development Inside Red Blood Cells. J Eukaryot Microbiol 2022; 69:e12894. [PMID: 35152525 DOI: 10.1111/jeu.12894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 01/26/2022] [Accepted: 02/04/2022] [Indexed: 11/26/2022]
Abstract
The Haemogregarinidae family (Apicomplexa: Adeleina) comprises hemoprotozoa that infect mammals, birds, amphibians, fish and reptiles. Some morphological characteristics of the Cyrilia lignieresi have been described previously, but the parasite-erythrocyte relationship is still poorly understood. In order to understand the structural architecture of Cyrilia lignieresi-infected red blood cells, electron microscopy-based three-dimensional reconstruction was carried out using TEM as well as FIB-SEM tomography. Results showed that development of the macrogametocyte-stage inside the red blood cell is related to an increase in cleft-like structures in the host cell cytoplasm. Furthermore, other aspects related to parasite intraerythrocytic development were explored by 3D visualization techniques. We observed the invagination of a large extension of the Inner Membrane Complex on the parasite body, which results from or induces a folding of the posterior end of the parasite. Small tubular structures were seen associated with areas related to Inner Membrane Complex folding. Taken together, results provide new information on the remodeling of erythrocytes induced by the protozoan C. lignieresi.
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Affiliation(s)
- Maíra Turiel-Silva
- Universidade do Estado do Pará, Centro de Ciëncias Biológicas e da Saúde, Marabá-PA, Brazil.,Instituto Evandro Chagas, Laboratório de Microscopia Eletrônica, Belém-PA, Brazil
| | - Camila Wendt
- Universidade Federal do Rio de Janeiro, Instituto de Biofísica Carlos Chagas Filho and Centro Nacional de Biologia Estrutural e Bioimagem, Rio de Janeiro-RJ, Brazil.,Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagem, Rio de Janeiro-RJ, Brazil
| | - Edilene O Silva
- Universidade Federal do Pará, Laboratório de Biologia Estrutural, Belém-PA, Brazil.,Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagem, Rio de Janeiro-RJ, Brazil
| | - Ana Paula Drummond Rodrigues
- Instituto Evandro Chagas, Laboratório de Microscopia Eletrônica, Belém-PA, Brazil.,Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagem, Rio de Janeiro-RJ, Brazil
| | - Wanderley de Souza
- Universidade Federal do Rio de Janeiro, Instituto de Biofísica Carlos Chagas Filho and Centro Nacional de Biologia Estrutural e Bioimagem, Rio de Janeiro-RJ, Brazil.,Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagem, Rio de Janeiro-RJ, Brazil
| | - Kildare Miranda
- Universidade Federal do Rio de Janeiro, Instituto de Biofísica Carlos Chagas Filho and Centro Nacional de Biologia Estrutural e Bioimagem, Rio de Janeiro-RJ, Brazil.,Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagem, Rio de Janeiro-RJ, Brazil
| | - José Diniz
- Instituto Evandro Chagas, Laboratório de Microscopia Eletrônica, Belém-PA, Brazil
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Da Costa JP, Rodrigues APD, Farias LHS, Frade PCR, Da Silva BJM, Do Nascimento JLM, Silva EO. Biological effects of kojic acid on human monocytes in vitro. Biomed Pharmacother 2018; 101:100-106. [PMID: 29477469 DOI: 10.1016/j.biopha.2018.02.036] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Revised: 01/29/2018] [Accepted: 02/09/2018] [Indexed: 12/14/2022] Open
Abstract
Monocytes are mononuclear phagocytes in peripheral blood that can differentiate into macrophages and dendritic cells. Macrophages play a specific role in the inflammatory process and are essential for the innate response. Given the important role of monocytes/macrophages in the immune response, this study aimed to evaluate the activity of kojic acid (KA), a natural product of certain fungal species, on human peripheral blood monocytes in vitro. Purified monocytes isolated from human blood were incubated with KA (50 μg/mL for 48 h) and analyzed by light microscopy, scanning electron microscopy, transmission electron microscopy and flow cytometry. Host cell cytotoxicity was measured by the colorimetric MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay. KA treatment induced morphological alterations in monocytes, such as increased cell size, as well as numerous cellular projections. Furthermore, flow cytometry revealed increased labeling of cell surface EMR1-F4/80 but decreased labeling of CD11b and CD14. KA also promoted increased IL-6 cytokine production but did not cause cytotoxic effects in monocytes. In conclusion, our results show that KA promotes the differentiation of monocytes into macrophages and can act as an immunomodulatory agent.
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Affiliation(s)
- Josineide P Da Costa
- Federal University of Pará, Institute of Biological Sciences, Laboratory of Structural Biology, Belém, Pará, Brazil; National Institute of Science and Technology in Structural Biology and Bioimaging, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Ana Paula D Rodrigues
- Laboratory of Electron Microscopy, Evandro Chagas Institute, Department of Health Surveillance, Ministry of Health, Belém, Pará, Brazil
| | - Luis Henrique S Farias
- Laboratory of Electron Microscopy, Evandro Chagas Institute, Department of Health Surveillance, Ministry of Health, Belém, Pará, Brazil
| | - Paula Cristina R Frade
- Federal University of Pará, Institute of Biological Sciences, Laboratory of Structural Biology, Belém, Pará, Brazil
| | - Bruno José Martins Da Silva
- Federal University of Pará, Institute of Biological Sciences, Laboratory of Structural Biology, Belém, Pará, Brazil; National Institute of Science and Technology in Structural Biology and Bioimaging, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Jose Luiz M Do Nascimento
- Federal University of Pará, Institute of Biological Sciences, Laboratory of Neurochemistry Molecular and Cellular, Belém, Pará, Brazil; Neuroscience Research Group, University CEUMA, São Luís, Brazil; National Institute of Science and Technology in Neuroimmunomodulation (INCT - NIM), Rio de Janeiro, Rio de Janeiro, Brazil
| | - Edilene O Silva
- Federal University of Pará, Institute of Biological Sciences, Laboratory of Structural Biology, Belém, Pará, Brazil; National Institute of Science and Technology in Structural Biology and Bioimaging, Rio de Janeiro, Rio de Janeiro, Brazil.
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Da Silva BJM, Souza-Monteiro JR, Rogez H, Crespo-López ME, Do Nascimento JLM, Silva EO. Selective effects of Euterpe oleracea (açai) on Leishmania (Leishmania) amazonensis and Leishmania infantum. Biomed Pharmacother 2018; 97:1613-1621. [DOI: 10.1016/j.biopha.2017.11.089] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Revised: 11/14/2017] [Accepted: 11/17/2017] [Indexed: 01/26/2023] Open
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Sarges FN, Cascaes MM, Moraes LS, Guilhon GMSP, Silva EO, Zoghbi MDGB, Andrade EHA, Rodrigues APD, Costa BF, Figueiredo RNM. Chemical characterisation of the constituents of Eugenia protenta McVaugh and leishmanicidal activity of dimethylxanthoxylin. Nat Prod Res 2017; 33:879-883. [PMID: 29212369 DOI: 10.1080/14786419.2017.1410804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The chemical study of Eugenia protenta McVaugh extracts performed by classical and high-performance liquid chromatography techniques and spectral methods has led to the identification of known triterpenoids, flavonoids and an acetophenone derivative (dimethylxanthoxylin). The effect of dimethylxanthoxylin on Leishmania (Leishmania) amazonensis was evaluated against the promastigotes forms after 96 h of treatment. Dimethylxanthoxylin reduced 57 and 59% of the promastigotes growth when treated with 50 and 100 μg/mL solutions, respectively (IC50 117.35 μg/mL or 52.3 μM). Cytotoxicity experiments using MTT assays showed that this substance did not promote cell death after 24 h of treatment. Dimethylxanthoxylin was active on the promastigotes and could be a promising agent for treating leishmaniasis.
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Affiliation(s)
- Flávio N Sarges
- a Programa de Pós-Graduação em Química , Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará , Belém , Brazil
| | - Márcia M Cascaes
- a Programa de Pós-Graduação em Química , Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará , Belém , Brazil.,b Programa de Capacitação Institucional , Museu Paraense Emílio Goeldi, Coordenação de Botânica , Belém , Brazil
| | - Lienne S Moraes
- c Laboratório de Protozoologia e Biologia Estrutural , Universidade Federal do Pará , Belém , Brazil.,d Instituto de Ciência e Tecnologia em Biologia Estrutural e Bioimagem , Universidade Federal do Rio de Janeiro , Rio de Janeiro , Brazil
| | - Giselle M S P Guilhon
- a Programa de Pós-Graduação em Química , Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará , Belém , Brazil
| | - Edilene O Silva
- c Laboratório de Protozoologia e Biologia Estrutural , Universidade Federal do Pará , Belém , Brazil.,d Instituto de Ciência e Tecnologia em Biologia Estrutural e Bioimagem , Universidade Federal do Rio de Janeiro , Rio de Janeiro , Brazil
| | | | - Eloisa H A Andrade
- a Programa de Pós-Graduação em Química , Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará , Belém , Brazil.,e Museu Paraense Emílio Goeldi , Belém , Brazil
| | - Ana Paula D Rodrigues
- d Instituto de Ciência e Tecnologia em Biologia Estrutural e Bioimagem , Universidade Federal do Rio de Janeiro , Rio de Janeiro , Brazil.,f Laboratório de Microscopia Eletrônica , Instituto Evandro Chagas, Secretaria de Vigilância em Saúde, Ministério da Saúde , Belém , Brazil
| | - Brenda F Costa
- f Laboratório de Microscopia Eletrônica , Instituto Evandro Chagas, Secretaria de Vigilância em Saúde, Ministério da Saúde , Belém , Brazil
| | - Rayssa N M Figueiredo
- f Laboratório de Microscopia Eletrônica , Instituto Evandro Chagas, Secretaria de Vigilância em Saúde, Ministério da Saúde , Belém , Brazil
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Silva EO, Goiozo PFI, Pereira LG, Headley SA, Bracarense AFRL. Concomitant Malignant Pulmonary Peripheral Nerve Sheath Tumour and Benign Cutaneous Peripheral Nerve Sheath Tumour in a Dog. J Comp Pathol 2017; 157:46-50. [PMID: 28735670 DOI: 10.1016/j.jcpa.2017.05.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 05/07/2017] [Accepted: 05/19/2017] [Indexed: 02/08/2023]
Abstract
Peripheral nerve sheath tumours (PNSTs) are neoplastic growths derived from Schwann cells, perineural cells or both. Malignant PNSTs (MPNSTs) are uncommon in domestic animals. This report describes the concomitant occurrence of PNSTs in a 10-year-old female cocker spaniel with a clinical history of respiratory impairment. Grossly, there was a large infiltrative mass in the caudal lobe of the right lung; smaller nodules were observed in the other lobes of the right lung. Furthermore, a small encapsulated cutaneous nodule was observed on the left hindlimb. Histopathology of the pulmonary tumours revealed the proliferation of pleomorphic spindle-shaped cells with moderate mitotic index arranged in interwoven bundles and concentric Antoni A and Antoni B patterns; invasion of the adjacent pulmonary tissue was observed. The cutaneous nodule consisted of neoplastic mesenchymal cells in interwoven bundles with concentric whorls, but without the marked anisokaryosis, binucleation and infiltrative growth seen in the pulmonary tumour. Immunohistochemistry revealed that both tumours were immunoreactive for vimentin, glial fibrillary acidic protein and S100 protein, but were negative for factor VIII. These findings are indicative of a MPNST in the lung with a concomitant benign PNST in the limb. This case represents the first report of a primary MPNST in the lung of a dog. This neoplastic growth should be included in the differential diagnosis of primary malignant pulmonary tumours of dogs.
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Affiliation(s)
- E O Silva
- Laboratory of Animal Pathology, Universidade do Oeste Paulista, Rodovia Raposo Tavares KM 572, Presidente Prudente-São Paulo, Brazil; Laboratory of Animal Pathology, Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid PR 445, Londrina, Paraná, Brazil.
| | - P F I Goiozo
- Laboratory of Animal Pathology, Universidade do Oeste Paulista, Rodovia Raposo Tavares KM 572, Presidente Prudente-São Paulo, Brazil
| | - L G Pereira
- Laboratory of Animal Pathology, Universidade do Oeste Paulista, Rodovia Raposo Tavares KM 572, Presidente Prudente-São Paulo, Brazil
| | - S A Headley
- Laboratory of Animal Pathology, Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid PR 445, Londrina, Paraná, Brazil
| | - A F R L Bracarense
- Laboratory of Animal Pathology, Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid PR 445, Londrina, Paraná, Brazil
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Brasil EM, Canavieira LM, Cardoso ÉTC, Silva EO, Lameira J, Nascimento JLM, Eifler-Lima VL, Macchi BM, Sriram D, Bernhardt PV, Silva JRA, Williams CM, Alves CN. Inhibition of tyrosinase by 4H-chromene analogs: Synthesis, kinetic studies, and computational analysis. Chem Biol Drug Des 2017; 90:804-810. [PMID: 28390091 DOI: 10.1111/cbdd.13001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Revised: 04/03/2017] [Accepted: 04/04/2017] [Indexed: 12/01/2022]
Abstract
Inhibition of mushroom tyrosinase was observed with synthetic dihydropyrano[3,2-b]chromenediones. Among them, DHPC04 displayed the most potent tyrosinase inhibitory activity with a Ki value of 4 μm, comparable to the reference standard inhibitor kojic acid. A kinetic study suggested that these synthetic heterocyclic compounds behave as competitive inhibitors for the L-DOPA binding site of the enzyme. Furthermore, molecular modeling provided important insight into the mechanism of binding interactions with the tyrosinase copper active site.
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Affiliation(s)
- Edikarlos M Brasil
- Laboratório de Planejamento e Desenvolvimento de Fármacos, Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, Belém, PA, Brazil.,School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland, Australia
| | - Luciana M Canavieira
- Laboratório de Planejamento e Desenvolvimento de Fármacos, Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, Belém, PA, Brazil
| | - Érica T C Cardoso
- Laboratório de Neuroquímica Molecular e Celular, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, PA, Brazil
| | - Edilene O Silva
- Laboratório de Biologia Estrutural, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, PA, Brazil
| | - Jerônimo Lameira
- Laboratório de Planejamento e Desenvolvimento de Fármacos, Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, Belém, PA, Brazil.,Programa de Pós-Graduação em Química Medicinal, Universidade Federal do Pará, Belém, PA, Brazil
| | - José L M Nascimento
- Laboratório de Neuroquímica Molecular e Celular, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, PA, Brazil.,Programa de Pós-Graduação em Química Medicinal, Universidade Federal do Pará, Belém, PA, Brazil
| | - Vera L Eifler-Lima
- Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Barbarella M Macchi
- Laboratório de Neuroquímica Molecular e Celular, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, PA, Brazil.,Programa de Pós-Graduação em Química Medicinal, Universidade Federal do Pará, Belém, PA, Brazil
| | - Dharmarajan Sriram
- Medicinal Chemistry and Antimycobacterial Research Laboratory, Department of Pharmacy, Birla Institute of Technology and Science, Hyderabad, India
| | - Paul V Bernhardt
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland, Australia
| | - José Rogério Araújo Silva
- Laboratório de Planejamento e Desenvolvimento de Fármacos, Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, Belém, PA, Brazil
| | - Craig M Williams
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland, Australia
| | - Cláudio N Alves
- Laboratório de Planejamento e Desenvolvimento de Fármacos, Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, Belém, PA, Brazil.,Programa de Pós-Graduação em Química Medicinal, Universidade Federal do Pará, Belém, PA, Brazil
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da Silva RRP, da Silva BJM, Rodrigues APD, Farias LHS, da Silva MN, Alves DTV, Bastos GNT, do Nascimento JLM, Silva EO. In vitro biological action of aqueous extract from roots of Physalis angulata against Leishmania (Leishmania) amazonensis. BMC Complement Altern Med 2015. [PMID: 26205771 PMCID: PMC4513958 DOI: 10.1186/s12906-015-0717-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND Leishmaniasis is an infectious disease caused by various species of the protozoan parasites of the Leishmania genus and transmitted by phlebotomine sandflies. The protozoa multiply in phagocytic cells, mainly macrophages, which play an important role defending the organism from pathogens. The most effective treatment for leishmaniasis is the chemotherapy and besides the high cost, these drugs are toxic and require a long period of treatment. Currently, some herbal products are considered an important alternative source of a new leishmanicidal agent, which includes the plant Physalis angulata, . We evaluated effects of an aqueous extract from roots of Physalis angulata (AEPa) on Leishmania proliferation, morphology and also determined whether physalins were present in the extract contributing to the knowledge of its pharmacological efficacy. METHODS Morphological alterations were determined by light microscopy, transmission and scanning electron microscopy. Host cell viability was evaluated by MTT, and propidium iodide. AEPa were submitted in full HRESITOF analysis. RESULTS AEPa promoted a dose-dependent reduction on promastigotes (IC50 = 39.5 μg/mL ± 5.1) and amastigotes (IC50 = 43.4 μg/mL ± 10.1) growth. This growth inhibition was associated with several morphological alterations observed in promastigote forms. No cytotoxic effect in mammalian cells was detected (IC50 > 4000 μg/mL). Furthemore, the presence of physalins A, B, D, E, F, G and H were described, for the first time, in the P. angulata root. CONCLUSIONS Results demonstrate that AEPa effectively promotes antileishmanial activity with several important morphological alterations and has no cytotoxic effects on host cells.
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da Silva BJM, Rodrigues APD, Farias LHS, Hage AAP, Do Nascimento JLM, Silva EO. Physalis angulata induces in vitro differentiation of murine bone marrow cells into macrophages. BMC Cell Biol 2014; 15:37. [PMID: 25281406 PMCID: PMC4665300 DOI: 10.1186/1471-2121-15-37] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Accepted: 09/24/2014] [Indexed: 12/22/2022] Open
Abstract
Background The bone marrow is a hematopoietic tissue that, in the presence of cytokines and growth factors, generates all of the circulating blood cells. These cells are important for protecting the organism against pathogens and for establishing an effective immune response. Previous studies have shown immunomodulatory effects of different products isolated from plant extracts. This study aimed to evaluate the immunomodulatory properties of aqueous Physalis angulata (AEPa) extract on the differentiation of bone marrow cells. Results Increased cellular area, higher spreading ability and several cytoplasmatic projections were observed in the treated cells, using optical microscopy, suggesting cell differentiation. Furthermore, AEPa did not promote the proliferation of lymphocytes and polymorphonuclear leukocytes, however promotes increased the number of macrophages in the culture. The ultrastructural analysis by Transmission Electron Microscopy of treated cells showed spreading ability, high number of cytoplasmatic projections and increase of autophagic vacuoles. Moreover, a high level of LC3b expression by treated cells was detected by flow cytometry, suggesting an autophagic process. Cell surface expression of F4/80 and CD11b also indicated that AEPa may stimulate differentiation of bone marrow cells mainly into macrophages. In addition, AEPa did not differentiate cells into dendritic cells, as assessed by CD11c analysis. Furthermore, no cytotoxic effects were observed in the cells treated with AEPa. Conclusion Results demonstrate that AEPa promotes the differentiation of bone marrow cells, particularly into macrophages and may hold promise as an immunomodulating agent.
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Affiliation(s)
- Bruno José Martins da Silva
- Instituto de Ciências Biológicas, Laboratório de Parasitologia e Laboratório de Biologia Estrutural, Universidade Federal do Pará, Avenida Augusto Corrêa, 01, Bairro Guamá, 660975-110, Belém, Pará, Brazil. .,Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagem, Rio de Janeiro, Brazil.
| | - Ana Paula D Rodrigues
- Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagem, Rio de Janeiro, Brazil. .,Laboratório de Microscopia Eletrônica, Instituto Evandro Chagas, Secretaria de Vigilância em Saúde do Ministério da Saúde, Belém, Pará, Brazil.
| | - Luis Henrique S Farias
- Instituto de Ciências Biológicas, Laboratório de Parasitologia e Laboratório de Biologia Estrutural, Universidade Federal do Pará, Avenida Augusto Corrêa, 01, Bairro Guamá, 660975-110, Belém, Pará, Brazil. .,Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagem, Rio de Janeiro, Brazil.
| | - Amanda Anastácia P Hage
- Instituto de Ciências Biológicas, Laboratório de Parasitologia e Laboratório de Biologia Estrutural, Universidade Federal do Pará, Avenida Augusto Corrêa, 01, Bairro Guamá, 660975-110, Belém, Pará, Brazil. .,Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagem, Rio de Janeiro, Brazil.
| | - Jose Luiz M Do Nascimento
- Instituto de Ciências Biológicas, Laboratório de Neuroquímica Molecular e Celular, Universidade Federal do Pará, Avenida Augusto Corrêa, 01, Bairro Guamá, 660975-110, Belém, Pará, Brazil.
| | - Edilene O Silva
- Instituto de Ciências Biológicas, Laboratório de Parasitologia e Laboratório de Biologia Estrutural, Universidade Federal do Pará, Avenida Augusto Corrêa, 01, Bairro Guamá, 660975-110, Belém, Pará, Brazil. .,Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagem, Rio de Janeiro, Brazil.
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Rodrigues APD, Farias LHS, Carvalho ASC, Santos AS, do Nascimento JLM, Silva EO. A novel function for kojic acid, a secondary metabolite from Aspergillus fungi, as antileishmanial agent. PLoS One 2014; 9:e91259. [PMID: 24621481 PMCID: PMC3951352 DOI: 10.1371/journal.pone.0091259] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Accepted: 02/08/2014] [Indexed: 01/27/2023] Open
Abstract
Kojic acid (KA) is a fungal metabolite used as a topical treatment skin-whitening cosmetic agent for melasma in humans; however its potential as an anti-leishmanial agent is unknown. Chemotherapy is one of the most effective treatments for Leishmaniasis. However, the drugs available are expensive, invasive, require long-term treatment and have severe side effects. Thus, the development of new effective leishmanicidal agents is a necessity. In this study we investigated the anti-leishmanial effect of KA on L. amazonensis, following in vitro and in vivo infections. KA (50 μg/mL) was found to decrease the growth by 62% (IC50 34 μg/mL) and 79% (IC50 27.84 μg/mL) of promastigotes and amastigotes in vitro, respectively. Ultrastructural analysis of KA-treated amastigotes showed the presence of vesicles bodies into the flagellar pocket, and an intense intracellular vacuolization and swelling of the mitochondrion. During the in vitro interaction of parasites and the host cell, KA reverses the superoxide anions (O2-) inhibitory mechanism promoted by parasite. In addition, 4 weeks after KA-topical formulation treatment of infected animals, a healing process was observed with a high production of collagen fibers and a decrease in parasite burden. Thus, these results demonstrated the great potential of KA as an anti-leishmanial compound.
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Affiliation(s)
- Ana Paula D. Rodrigues
- Universidade Federal do Pará, Instituto de Ciências Biológicas, Laboratório de Biologia Estrutural, Belém, Pará, Brazil
- Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagem, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil
- Laboratório de Microscopia Eletrônica, Instituto Evandro Chagas, Secretaria de Vigilância em Saúde do Ministério da Saúde, Belém, Pará, Brazil
| | - Luis Henrique S. Farias
- Universidade Federal do Pará, Instituto de Ciências Biológicas, Laboratório de Biologia Estrutural, Belém, Pará, Brazil
- Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagem, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Antonio Sérgio C. Carvalho
- Universidade Federal do Pará, Instituto de Ciências Exatas e Naturais, Laboratório de Investigação Sistemática em Biotecnologia e Biodiversidade Molecular do Instituto de Ciências Exatas e Naturais, Belém, Pará, Brazil
| | - Alberdan S. Santos
- Universidade Federal do Pará, Instituto de Ciências Exatas e Naturais, Laboratório de Investigação Sistemática em Biotecnologia e Biodiversidade Molecular do Instituto de Ciências Exatas e Naturais, Belém, Pará, Brazil
| | - José Luiz M. do Nascimento
- Universidade Federal do Pará, Instituto de Ciências Biológicas, Laboratório de Neuroquímica Molecular e Celular, Belém, Pará, Brazil
| | - Edilene O. Silva
- Universidade Federal do Pará, Instituto de Ciências Biológicas, Laboratório de Biologia Estrutural, Belém, Pará, Brazil
- Instituto Nacional de Ciência e Tecnologia em Biologia Estrutural e Bioimagem, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil
- * E-mail:
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Farias LHS, Rodrigues APD, Silveira FT, Seabra SH, DaMatta RA, Saraiva EM, Silva EO. Phosphatidylserine Exposure and Surface Sugars in Two Leishmania (Viannia) braziliensis Strains Involved in Cutaneous and Mucocutaneous Leishmaniasis. J Infect Dis 2012; 207:537-43. [DOI: 10.1093/infdis/jis689] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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12
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Bonadiman SF, Miranda FJB, Ribeiro MLS, Rabelo G, Lainson R, Silva EO, DaMatta RA. Hematological parameters of Ameiva ameiva (Reptilia: Teiidae) naturally infected with hemogregarine: Confirmation of monocytosis. Vet Parasitol 2010; 171:146-50. [PMID: 20409641 DOI: 10.1016/j.vetpar.2010.03.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2009] [Revised: 03/03/2010] [Accepted: 03/09/2010] [Indexed: 11/18/2022]
Affiliation(s)
- Sergio F Bonadiman
- Laboratório de Biologia Celular e Tecidual, Centro de Biociências e Biotecnologia, Parque Califórnia, Av. Alberto Lamego, 2000 Universidade Estadual do Norte Fluminense, 28013-602 Campos dos Goytacazes, RJ, Brazil
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13
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Ramos PK, Diniz JA, Silva EO, Quaresma JA, Saraiva EM, Seabra SH, Atella GC, de Souza W. Characterization in vivo and in vitro of a strain of Leishmania (Viannia) shawi from the Amazon Region. Parasitol Int 2009; 58:154-60. [DOI: 10.1016/j.parint.2009.01.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2008] [Revised: 01/15/2009] [Accepted: 01/19/2009] [Indexed: 11/28/2022]
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14
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António V.Santos M, Rodrigues IRC, Santos OJD, Bichara CNC, Silva EO. PREVALÊNCIA DA INFECÇÃO HUMANA POR Schistosoma mansoni EM BELÉM DO PARÁ E ESTUDO DA POSITIVIDADE DA Biomphalaria glabrata. Rev Patol Trop 2007. [DOI: 10.5216/rpt.v26i1.17374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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15
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Silva EO, Diniz JAP, Lainson R, DaMatta RA, de Souza W. Ultrastructural study of the gametocytes and merogonic stages of Fallisia audaciosa (Haemosporina: Garniidae) that infect neutrophils of the lizard Plica umbra (Reptilia: Iguanidae). Protist 2006; 157:13-9. [PMID: 16427806 DOI: 10.1016/j.protis.2005.10.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2005] [Accepted: 10/30/2005] [Indexed: 11/30/2022]
Abstract
Little is known regarding the ultrastructure of the genus Fallisia (Apicomplexa: Haemosporina: Garniidae). This report describes the fine structure of some developmental stages of Fallisia audaciosa that infect neutrophils in the peripheral blood of the Amazonian lizard Plica umbra (Reptilia: Iguanidae). The parasites lie within a parasitophorous vacuole and exhibit the basic structures of members of the Apicomplexa, such as the pellicle and the cytostome. Invaginations of the inner membrane complex were seen in the gametocytes and may be concerned with nutrition. The meronts were irregularly shaped before division, a feature unusual among members of the Apicomplexa. The unusual presence of a parasitic protozoan within neutrophils, in some way interfering with or modulating the microbicidal activity of such cells, is discussed.
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Affiliation(s)
- Edilene O Silva
- Laboratório de Parasitologia, Departamento de Patologia, Centro de Ciências Biológicas, Universidade Federal do Pará, Av. Augusto Corrêa s/n, Bairro Guamá, 66075-110 Belém, Pará, Brazil.
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16
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Silva EO, Diniz JAP, Lainson R, DaMatta RA, de Souza W. Ultrastructural aspects of Fallisia effusa (Haemosporina: Garniidae) in thrombocytes of the lizard Neusticurus bicarinatus (Reptilia: Teiidae). Protist 2005; 156:35-43. [PMID: 16048131 DOI: 10.1016/j.protis.2004.09.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The fine structure of the different stages of the Fallisia effusa (Haemosporina: Garniidae), infecting the thrombocytes of the semi-aquatic Amazonian lizard Neusticurus bicarinatus (Reptilia: Teiidae) is described. Gametocytes, meronts, and merozoites of Fallisia effusa were found within a parasitophorous vacuole (PV). Multiple infections of micro- and macrogametocytes were observed. A circumferential coil of microtubules was seen in the cytoplasm of the infected host cell and this microtubule array was pronounced in cells harboring gametocytes. A deep invagination of the inner membrane complex of gametocytes may be involved in nutrition. The non-pigmented parasites underwent both merogony and gametogony in thrombocytes of the peripheral blood. No infection of the erythrocytes was observed. These observations confirm that Fallisia effusa displays characteristic features distinguishing it from other members of the Haemosporidian families, and that it has the ability to modulate microtubule assembly.
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Affiliation(s)
- Edilene O Silva
- Laboratório de Parasitologia, Departamento de Patologia, Centro de Ciências Biológicas, Universidade Federal do Pará, Av. Augusto Corrêa s/n, Bairro Guamá, 66075-110 Belém, Pará, Brazil.
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17
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Alberio SO, Diniz JA, Silva EO, de Souza W, DaMatta RA. Cytochemical and functional characterization of blood and inflammatory cells from the lizard Ameiva ameiva. Tissue Cell 2005; 37:193-202. [PMID: 15936356 DOI: 10.1016/j.tice.2004.12.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2004] [Revised: 12/22/2004] [Accepted: 12/30/2004] [Indexed: 11/15/2022]
Abstract
The fine structure and differential cell count of blood and coelomic exudate leukocytes were studied with the aim to identify granulocytes from Ameiva ameiva, a lizard distributed in the tropical regions of the Americas. Blood leukocytes were separated with a Percoll cushion and coelomic exudate cells were obtained 24 h after intracoelomic thioglycollate injection. In the blood, erythrocytes, monocytes, thrombocytes, lymphocytes, plasma cells and four types of granulocytes were identified based on their morphology and cytochemistry. Types I and III granulocytes had round intracytoplasmic granules with the same basic morphology; however, type III granulocyte had a bilobued nucleus and higher amounts of heterochromatin suggesting an advance stage of maturation. Type II granulocytes had fusiformic granules and more mitochondria. Type IV granulocytes were classified as the basophil mammalian counterpart based on their morphology and relative number. Macrophages and granulocytes type III were found in the normal coelomic cavity. However, after the thioglycollate injection the number of type III granulocyte increased. Granulocytes found in the coelomic cavity were related to type III blood granulocyte based on the morphology and cytochemical localization of alkaline phosphatase and basic proteins in their intracytoplasmic granules. Differential blood leukocyte counts showed a predominance of type III granulocyte followed by lymphocyte, type I granulocyte, type II granulocyte, monocyte and type IV granulocyte. Taken together, these results indicate that types I and III granulocytes correspond to the mammalian neutrophils/heterophils and type II to the eosinophil granulocytes.
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Affiliation(s)
- Sanny O Alberio
- Departamento de Fisiologia, Universidade Estadual do Pará, 66887-670 Belém, PA, Brazil
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18
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Bond J, Roberts E, Springel K, Lizarraga S, Scott S, Higgins J, Hampshire DJ, Morrison EE, Leal GF, Silva EO, Costa SMR, Baralle D, Raponi M, Karbani G, Rashid Y, Jafri H, Bennett C, Corry P, Walsh CA, Woods CG. Erratum: Corrigendum: A centrosomal mechanism involving CDK5RAP2 and CENPJ controls brain size. Nat Genet 2005. [DOI: 10.1038/ng0505-555d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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19
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Silva EO, Diniz JP, Alberio S, Lainson R, de Souza W, DaMatta RA. Blood monocyte alteration caused by a hematozoan infection in the lizard Ameiva ameiva (Reptilia: Teiidae). Parasitol Res 2004; 93:448-56. [PMID: 15243797 DOI: 10.1007/s00436-004-1151-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2004] [Accepted: 06/08/2004] [Indexed: 10/26/2022]
Abstract
Although hematozoa have been described from many different host species, little is known about the infection and its relationship to the physiology of the host. We studied a hematozoan, regarded as a species of Lainsonia Landau, 1973 (Lankestereliidae), which infects the monocytes of the lizard Ameiva ameiva. The infected animals show a huge monocytosis and morphological changes in the monocytes. Ultrastructurally, the parasite has an apical complex, dense bodies, electron lucent structures, plasma membrane projections and folding which may be involved with nutrition. The parasite occupies a parasitophorous vacuole (PV) exhibiting high electron density at its membrane. Mitochondria and the Golgi complex of the monocytes were concentrated around the PV, and the cytoplasm was totally occupied by a vimentin type of intermediate filament radiating from (or to) the cytosolic surface of the PV. Vimentin was identified by diameter measurement, immunofluorescence and immunoelectron microscopy. These observations indicate that this infection alters the physiological state of the host and suggest that this parasite has the ability to modify monocyte vimentin assembly.
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Affiliation(s)
- Edilene O Silva
- Laboratório de Parasitologia, Departamento de Patologia, Centro de Ciências Biológicas, Universidade Federal do Pará, Av. Augusto Corrêa s/n, Bairro Guamá, 66075-110, Belém, Brazil
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20
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Leal GF, Roberts E, Silva EO, Costa SMR, Hampshire DJ, Woods CG. A novel locus for autosomal recessive primary microcephaly (MCPH6) maps to 13q12.2. J Med Genet 2003; 40:540-2. [PMID: 12843329 PMCID: PMC1735531 DOI: 10.1136/jmg.40.7.540] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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21
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Diniz JA, Silva EO, de Souza W, Lainson R. Some observations on the fine structure of trophozoites of the haemogregarine Cyrilia lignieresi (Adeleina: Haemogregarinidae) in erythrocytes of the fish Synbranchus marmoratus (Synbranchidae). Parasitol Res 2002; 88:593-7. [PMID: 12107449 DOI: 10.1007/s00436-002-0603-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2001] [Accepted: 01/10/2002] [Indexed: 10/27/2022]
Abstract
This communication describes the fine structure of trophozoites of the haemogregarine Cyrilia lignieresi (Laveran, 1906) found in erythrocytes of the fresh-water fish Synbranchus marmoratus from Belém, Pará, North Brazil. The parasite possesses the usual structures, such as conoid, rhoptries and micronemes, seen in members of the phylum Apicomplexa. Three structures, however, appear to be characteristic features of this parasite. The parasitophorous vacuole is unusual in containing a large number of spherical bodies. Secondly, some of the dense bodies, which are usually spherical organelles, may appear as elongated structures. Thirdly, peculiar invaginations of the inner membrane appear to divide the parasite into compartments.
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Affiliation(s)
- J A Diniz
- Unidade de Microscopia Eletrônica, Instituto Evandro Chagas, Av. Almirante Barroso 492, Bairro Marco, 66090-000 Belém, Pará, Brazil.
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22
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Abstract
Most of the studies on the fine structure of protozoa of the Apicomplexa group have been carried out with members of the ToxoPlasma, Eimeria, and Plasmodium genera. In the present study we analyzed the fine structure of Garnia gonadoti parasitizing the red blood cells of the Amazonian reptile Gonatodes humeralis (Reptilia; Lacertilia). Transmission electron microscopy of thin sections showed that G. gonadoti presented all structures characteristic of the group, including the apicoplast. However, four special features were observed: (1) absence of the hemozoin (malarial) pigment; (2) a group of microtubules associated with the mitochondrion; (3) a vacuole containing electron-dense material, which resembled the acidocalcisome described in trypanosomatids; and (4) a special array of the host-cell endoplasmic reticulum around the parasitophorous vacuole.
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Affiliation(s)
- J A Diniz
- Unidade de Microscopia Eletr nica, Instituto Evandro Chagas, Belem, Pará, Brazil
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23
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Splendore A, Silva EO, Alonso LG, Richieri-Costa A, Alonso N, Rosa A, Carakushanky G, Cavalcanti DP, Brunoni D, Passos-Bueno MR. High mutation detection rate in TCOF1 among Treacher Collins syndrome patients reveals clustering of mutations and 16 novel pathogenic changes. Hum Mutat 2000; 16:315-22. [PMID: 11013442 DOI: 10.1002/1098-1004(200010)16:4<315::aid-humu4>3.0.co;2-h] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Twenty-eight families with a clinical diagnosis of Treacher Collins syndrome were screened for mutations in the 25 coding exons of TCOF1 and their adjacent splice junctions through SSCP and direct sequencing. Pathogenic mutations were detected in 26 patients, yielding the highest detection rate reported so far for this disease (93%) and bringing the number of known disease-causing mutations from 35 to 51. This is the first report to describe clustering of pathogenic mutations. Thirteen novel polymorphic alterations were characterized, confirming previous reports that TCOF1 has an unusually high rate of single-nucleotide polymorphisms (SNPs) within its coding region. We suggest a possible different mechanism leading to TCS or genetic heterogeneity for this condition, as we identified two families with no apparent pathogenic mutation in the gene. Furthermore, our data confirm the absence of genotype-phenotype correlation and reinforce that the apparent anticipation often observed in TCS families is due to ascertainment bias.
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Affiliation(s)
- A Splendore
- Centro de Estudos do Genoma Humano, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
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Carter NS, Ben Mamoun C, Liu W, Silva EO, Landfear SM, Goldberg DE, Ullman B. Isolation and functional characterization of the PfNT1 nucleoside transporter gene from Plasmodium falciparum. J Biol Chem 2000; 275:10683-91. [PMID: 10744765 DOI: 10.1074/jbc.275.14.10683] [Citation(s) in RCA: 111] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Plasmodium falciparum, the causative agent of the most lethal form of human malaria, is incapable of de novo purine synthesis, and thus, purine acquisition from the host is an indispensable nutritional requirement. This purine salvage process is initiated by the transport of preformed purines into the parasite. We have identified a gene encoding a nucleoside transporter from P. falciparum, PfNT1, and analyzed its function and expression during intraerythrocytic parasite development. PfNT1 predicts a polypeptide of 422 amino acids with 11 transmembrane domains that is homologous to other members of the equilibrative nucleoside transporter family. Southern analysis and BLAST searching of The Institute for Genomic Research (TIGR) malaria data base indicate that PfNT1 is a single copy gene located on chromosome 14. Northern analysis of RNA from intraerythrocytic stages of the parasite demonstrates that PfNT1 is expressed throughout the asexual life cycle but is significantly elevated during the early trophozoite stage. Functional expression of PfNT1 in Xenopus laevis oocytes significantly increases their ability to take up naturally occurring D-adenosine (K(m) = 13.2 microM) and D-inosine (K(m) = 253 microM). Significantly, PfNT1, unlike the mammalian nucleoside transporters, also has the capacity to transport the stereoisomer L-adenosine (K(m) > 500 microM). Inhibition studies with a battery of purine and pyrimidine nucleosides and bases as well as their analogs indicate that PfNT1 exhibits a broad substrate specificity for purine and pyrimidine nucleosides. These data provide compelling evidence that PfNT1 encodes a functional purine/pyrimidine nucleoside transporter whose expression is strongly developmentally regulated in the asexual stages of the P. falciparum life cycle. Moreover, the unusual ability to transport L-adenosine and the vital contribution of purine transport to parasite survival makes PfNT1 an attractive target for therapeutic evaluation.
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Affiliation(s)
- N S Carter
- Department of Biochemistry and Molecular Biology, Oregon Health Sciences University, Portland, Oregon 97201, USA
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Silva EO, Freitas EM, Costa SM, Duarte AR. [Down syndrome associated with clinical manifestations of Kabuki syndrome: report of a case]. J Pediatr (Rio J) 1999; 75:367-9. [PMID: 14685516 DOI: 10.2223/jped.331] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
OBJECTIVE: To describe an atypical case of Down syndrome presenting with additional clinical manifestations that might be components of Kabuki (Niikawa-Kuroki) syndrome.CLINICAL REPORT: We report the clinical history of a 19-month-old girl with a 47,XX, +21 karyotype, who presented brachycephaly, flat face, long palpebral fissures, eversion of the lateral portion of the lower eyelids, arched eyebrows with sparse lateral regions, long eyelashes, epicanthus, cortical cataract, small ears, protruding tongue, muscular hypotonia, developmental delay, hyperflexibility of joints, brachydactyly, and dermatoglyphic abnormalities.CONCLUSION: The diagnosis of Down syndrome was confirmed cytogenetically. However, the presence of additional anomalies - mainly in the ocular region - suggested that the child might also have the Kabuki syndrome.
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Affiliation(s)
- E O Silva
- Universidade Federal de Pernambuco (UFPE), Recife, PE, Brazil
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Silva EO, Saraiva EM, De Souza W, Souto-Padrón T. Cell surface characterization of amastigotes of Trypanosoma cruzi obtained from different sources. Parasitol Res 1998; 84:257-63. [PMID: 9569088 DOI: 10.1007/s004360050392] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The present study analyses the morphology and the exposition of surface carbohydrates and the Ssp4 antigen of amastigote forms of Trypanosoma cruzi (Y strain) obtained from three different sources: (a) intracellular, isolated from infected Vero cells 3 days after infection, (b) extracellular, isolated from the supernatant of Vero cells 15 days after infection, and (c) axenic, obtained by incubation of tissue culture trypomastigotes in LIT medium, at 37 degrees C for 4 days. No morphological differences were observed by light microscopy among these amastigotes. Transmission electron microscopy of thin sections showed a thick cell coat easily observed on the plasma membrane of axenic amastigotes. Carbohydrate-containing sites on the surface of the three different amastigotes were analysed using lectins, agglutination assays and flow cytometry. Mannose and/or glucose residues were found on the surface of all populations, but intracellular amastigotes showed the highest number. A small group of cells from the different populations expressed galactose and N-acetyl-glucosamine residues. The presence and distribution of the Ssp4 antigen in the different amastigote populations were evaluated using FITC and gold-labelled antibodies, and observed with an electronic programmable individual cell sorter and transmission electron microscopy. Ssp4 antigen was present on the membrane lining the flagellar pocket and on the cell surface, as well as inside the cytoplasmic vesicles of the host cell. Flow cytometry analysis of different amastigote populations showed that intracellular amastigotes presented the highest percentage of Ssp4-expressing cells.
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Affiliation(s)
- E O Silva
- Laboratório de Protozoologia I, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Brazil
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27
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Rodrigues VL, Ferraz-Filho AN, Ishihata GK, Silva EO. [Triatoma brasiliensis Neiva, 1911 (Hemiptera, Reduviidae): observations on dynamics of feeding behavior in an artificial ecotope]. CAD SAUDE PUBLICA 1995; 11:266-70. [PMID: 14528333 DOI: 10.1590/s0102-311x1995000200010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
In order to study the behavior of triatomine bugs under artificial ecotopic conditions, an experimental, double-walled poultry coop was built. Its inside walls were made of sun-dried clay blocks which could be broken apart for better access to the insects hiding in their crevices. The coop was subdivided into two main areas of different sizes using wire netting and a wall made of perforated bricks. The chickens, the only food source available for the triatomines, were kept in the larger, rectangular area, further subdivided diagonally. The triatomines were released in the smaller area and were allowed to migrate to the larger one though the holes in the bricks. Information about migration, survival, and hiding places of fourth-stage nymphs of Triatoma brasiliensis was thus gathered. At 30-day intervals, over a period of six months, the inner walls of the house were taken apart and inspected. The nymphs were marked with different colors according to the month and place of capture. It was found that 88.5% of the nymphs were captured near the roost and found engorged. After having taken their first blood meal, they would remain in the vicinity of their food source. The results obtained are considered epidemiologically relevant, and particularly so as pertaining to the control of the vectors of Chagas disease.
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Affiliation(s)
- V L Rodrigues
- Superintendência de Controle de Endemias, Secretaria de Estado da Saúde, Mogi Guaçu, SP, 13840-000, Brasil
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