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The absence of eosinophils is associated with early metastatic lesions in Leishmania amazonensis-infected mice
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Almeida, Gregório Guilherme

; Luehring, Tassiane Assíria Martins

; Paixão, Pierre Henrique de Menezes

; Soares, Rodrigo Pedro

; de Barros, André Luís Branco

; do Monte-Neto, Rubens Lima

; Tafuri, Wagner Luiz

; Negrão-Corrêa, Deborah Aparecida

; Gonçalves, Ricardo

Memórias do Instituto Oswaldo Cruz

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2024, Volume 119 elocation e220242

Resumo: En | Texto: En | PDF: En

BACKGROUND Eosinophils are granulocytes that rapidly increase frequency in the bloodstream during helminthic infections and allergic responses. They are found in tissue infected by Leishmania during early disease, but their role during infection is not entirely understood. OBJECTIVES We aim to compare the disease due to Leishmania amazonensis in BALB/c and Δdbl-GATA1 mice, which lack eosinophils. METHODS BALB/c and Δdbl-GATA1 mice infected with L. amazonensis were observed for several weeks. The parasite load and dissemination pattern were assessed. FINDINGS The Δdbl-GATA1 mice developed an anticipated dissemination of L. amazonensis and a worsening disease. No differences were found in the lesion development or the parasite load in the footpad among Δdbl-GATA1 mice and BALB/c eight weeks after infection. However, nine weeks after infection, massive growth of metastatic lesions appeared in several parts of the skin in Δdbl-GATA1 mice, weeks earlier than BALB/c. We observed increased parasites in the bloodstream, probably an essential dissemination route. Thirteen weeks after infection, metastatic lesions were found in all Δdbl-GATA1 mice. MAIN CONCLUSION These results suggest a protective role of eosinophils in delaying the disease caused by L. amazonensis, although several limitations of this mice strain must be considered.

https://doi.org/10.1590/0074-02760220242

First report of putative Leishmania RNA virus 2 (LRV2) in Leishmania infantum strains from canine and human visceral leishmaniasis cases in the southeast of Brazil
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Rêgo, Felipe Dutra

; da Silva, Eduardo Sérgio

; Lopes, Valeriana Valadares

; Teixeira-Neto, Rafael Gonçalves

; Belo, Vinícius Silva

; Fonseca Júnior, Antônio Augusto

; Pereira, Diego Andrade

; Pena, Heber Paulino

; Laurenti, Márcia Dalastra

; Araújo, Gabriela V

; da Matta, Vânia Lúcia Ribeiro

; Chouman, Islam Hussein

; Burrin, Thainá Bergantin

; Sandoval, Carmen M

; Barrouin-Melo, Stella Maria

; de Pinho, Flaviane Alves

; de Andrade, Hélida Monteiro

; Nunes, Ramon Vieira

; Gontijo, Célia Maria Ferreira

; Soccol, Vanete Thomaz

; Klocek, Donnamae

; Grybchuk, Danyil

; Macedo, Diego Henrique

; do Monte-Neto, Rubens Lima

; Yurchenko, Vyacheslav

; Soares, Rodrigo Pedro

Memórias do Instituto Oswaldo Cruz

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2023, Volume 118 elocation e230071

Resumo: En | Texto: En | PDF: En

BACKGROUND Leishmania RNA virus 1 (LRV1) is commonly found in South American Leishmania parasites belonging to the subgenus Viannia, whereas Leishmania RNA virus 2 (LRV2) was previously thought to be restricted to the Old-World pathogens of the subgenus Leishmania. OBJECTIVES In this study, we investigated the presence of LRV2 in strains of Leishmania (L.) infantum, the causative agent of visceral leishmaniasis (VL), originating from different hosts, clinical forms, and geographical regions. METHODS A total of seventy-one isolates were screened for LRV2 using semi-nested reverse transcription-polymerase chain reaction (RT-PCR) targeting the RNA-dependent RNA polymerase (RdRp) gene. FINDINGS We detected LRV2 in two L. infantum isolates (CUR268 and HP-EMO) from canine and human cases, respectively. MAIN CONCLUSIONS To the best of our knowledge, this is the first detection of LRV2 in the New World.

https://doi.org/10.1590/0074-02760230071

Leishmania enriettii visceralises in the trachea, lungs, and spleen of Cavia porcellus
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Alves-Sobrinho, Ednéia Venâncio

; Pinheiro, Lucélia de Jesus

; Paranaíba, Larissa Ferreira

; Fontes, Igor Campos

; Parreiras, Patrícia Martins

; Gontijo, Nelder Figueiredo

; Tafuri, Wagner Luiz

; Laurenti, Márcia Dalastra

; Soares, Rodrigo Pedro

Memórias do Instituto Oswaldo Cruz

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2022, Volume 117 elocation e220065

Resumo: En | Texto: En | PDF: En

BACKGROUND Leishmania (Mundinia) enriettii is a species commonly found in the guinea pig, Cavia porcellus. Although it is a dermotropic species, there is still an uncertainty regarding its ability to visceralise during Leishmania life cycle. OBJECTIVE Here, we investigated the ability of L. enriettii (strain L88) to visceralise in lungs, trachea, spleen, and liver of C. porcellus, its natural vertebrate host. METHODS Animals were infected sub-cutaneously in the nose and followed for 12 weeks using histological (hematoxilin-eosin) and molecular tools (polymerase chain reaction-restriction fragment length polymorphism - PCR-RFLP). To isolate parasite from C. porcellus, animals were experimentally infected for viscera removal and PCR typing targeting hsp70 gene. FINDINGS Histological analysis revealed intense and diffuse inflammation with the presence of amastigotes in the trachea, lung, and spleen up to 12 weeks post-infection (PI). Molecular analysis of paraffin-embedded tissues detected parasite DNA in the trachea and spleen between the 4th and 8th weeks PI. At the 12th PI, no parasite DNA was detected in any of the organs. To confirm that the spleen could serve as a temporary site for L. enriettii, we performed additional in vivo experiments. During 6th week PI, the parasite was isolated from the spleen confirming previous histopathological and PCR observations. MAIN CONCLUSION Leishmania enriettii (strain L88) was able to visceralise in the trachea, lung, and spleen of C. porcellus.

https://doi.org/10.1590/0074-02760220065

Lutzomyia longipalpis: an update on this sand fly vector
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RÊGO, FELIPE D.

; SOARES, RODRIGO PEDRO

Anais da Academia Brasileira de Ciências

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2021, Volume 93 Nº 3 elocation e20200254

Resumo: En | Texto: En | PDF: En

Abstract Lutzomyia longipalpis is the most important vector of Leishmania infantum, the etiological agent of visceral leishmaniasis (VL) in the New World. It is a permissive vector susceptible to infection with several Leishmania species. One of the advantages that favors the study of this sand fly is the possibility of colonization in the laboratory. For this reason, several researchers around the world use this species as a model for different subjects including biology, insecticides testing, host-parasite interaction, physiology, genetics, proteomics, molecular biology, and saliva among others. In 2003, we published our first review (Soares & Turco 2003) on this vector covering several aspects of Lu. longipalpis. This current review summarizes what has been published between 2003-2020. During this period, modern approaches were incorporated following the development of more advanced and sensitive techniques to assess this sand fly.

https://doi.org/10.1590/0001-3765202120200254 397 downloads

Antimony resistance in Leishmania (Viannia) braziliensis clinical isolates from atypical lesions associates with increased ARM56/ARM58 transcripts and reduced drug uptake
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Rugani, Jeronimo Nunes

; Gontijo, Célia Maria Ferreira

; Frézard, Frédéric

; Soares, Rodrigo Pedro

; Monte-Neto, Rubens Lima do

Memórias do Instituto Oswaldo Cruz

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2019, Volume 114 elocation e190111

Resumo: En | Texto: En | PDF: En

BACKGROUND In addition to the limited therapeutic arsenal and the side effects of antileishmanial agents, drug resistance hinders disease control. In Brazil, Leishmania braziliensis causes atypical (AT) tegumentary leishmaniasis lesions, frequently refractory to treatment. OBJECTIVES The main goal of this study was to characterise antimony (Sb)-resistant (SbR) L. braziliensis strains obtained from patients living in Xakriabá indigenous community, Minas Gerais, Brazil. METHODS The aquaglyceroporin 1-encoding gene (AQP1) from L. braziliensis clinical isolates was sequenced, and its function was evaluated by hypo-osmotic shock. mRNA levels of genes associated with Sb resistance were measured by quantitative reverse transcription polymerase chain reaction (qRT-PCR). Atomic absorption was used to measure Sb uptake. FINDINGS Although clinical isolates presented delayed recovery time in hypo-osmotic shock, AQP1 function was maintained. Isolate 340 accumulated less Sb than all other isolates, supporting the 65-fold downregulation of AQP1 mRNA levels. Both 330 and 340 isolates upregulated antimony resistance marker (ARM) 56/ARM58 and multidrug resistant protein A (MRPA); however, only ARM58 upregulation was an exclusive feature of SbR field isolates. CA7AE seemed to increase drug uptake in L. braziliensis and represented a tool to study the role of glycoconjugates in Sb transport. MAIN CONCLUSIONS There is a clear correlation between ARM56/58 upregulation and Sb resistance in AT-harbouring patients, suggesting the use of these markers as potential indicators to help the treatment choice and outcome, preventing therapeutic failure.

https://doi.org/10.1590/0074-02760190111 1415 downloads

Lutzomyia umbratilis from an area south of the Negro River is refractory to in vitro interaction with Leishmania guyanensis
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Soares, Rodrigo Pedro

; Nogueira, Paula Monalisa

; Secundino, Nágila Francinete

; Marialva, Eric Fabrício

; Ríos-Velásquez, Cláudia Maria

; Pessoa, Felipe Arley Costa

Memórias do Instituto Oswaldo Cruz

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Mar 2018, Volume 113 Nº 3 Páginas 202 - 205

Resumo: En | Texto: En | PDF: En

BACKGROUND Lutzomyia umbratilis, the vector for Leishmania guyanensis in northern South America, has been found naturally infected with L. guyanensis only in areas north of the Negro and Amazon rivers. While populations of this sand fly species are also found in areas south of these rivers, these populations have never been reported to be infected and/or transmitting L. guyanensis. However, no studies on the corresponding host-parasite interactions are available. OBJECTIVES This study evaluated the interaction between Lu. guyanensis promastigotes and field-collected Lu. umbratilis sand flies from Rio Preto da Eva and Manacapuru, which are located to the north and south, respectively, of the Negro River. METHODS Procyclic and metacyclic attachment was quantified using an in vitro system. FINDINGS Low attachment of parasites to the midguts of insects collected from Manacapuru was detected. Conversely, greater binding of metacyclic parasites was observed in the midguts of insects collected from Rio Preto da Eva, and this attachment was more pronounced than that observed for procyclics (p < 0.03). MAIN CONCLUSIONS The Lu. umbratilis population from an area south of the Negro River has lower in vitro interaction with L. guyanensis. The higher attachment of L. guyanensis to midguts of insects from Rio Preto da Eva may suggest better vector competence. These findings are in accordance with previously reported epidemiological information of American cutaneous leishmaniasis (ACL) transmission in the Amazon.

https://doi.org/10.1590/0074-02760170425 1163 downloads

Lower galactosylation levels of the Lipophosphoglycan from Leishmania (Leishmania) major-like strains affect interaction with Phlebotomus papatasi and Lutzomyia longipalpis
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Guimarães, Agna Cristina

; Nogueira, Paula Monalisa

; Silva, Soraia de Oliveira

; Sadlova, Jovana

; Pruzinova, Katerina

; Hlavacova, Jana

; Melo, Maria Norma

; Soares, Rodrigo Pedro

Memórias do Instituto Oswaldo Cruz

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2018, Volume 113 Nº 5 elocation e170333

Resumo: En | Texto: En | PDF: En

BACKGROUND Leishmania major is an Old World species causing cutaneous leishmaniasis and is transmitted by Phlebotomus papatasi and Phlebotomus duboscqi. In Brazil, two isolates from patients who never left the country were characterised as L. major-like (BH49 and BH121). Using molecular techniques, these isolates were indistinguishable from the L. major reference strain (FV1). OBJECTIVES We evaluated the lipophosphoglycans (LPGs) of the strains and their behaviour in Old and New World sand fly vectors. METHODS LPGs were purified, and repeat units were qualitatively evaluated by immunoblotting. Experimental in vivo infection with L. major-like strains was performed in Lutzomyia longipalpis (New World, permissive vector) and Ph. papatasi (Old World, restrictive or specific vector). FINDINGS The LPGs of both strains were devoid of arabinosylated side chains, whereas the LPG of strain BH49 was more galactosylated than that of strain BH121. All strains with different levels of galactosylation in their LPGs were able to infect both vectors, exhibiting colonisation of the stomodeal valve and metacyclogenesis. The BH121 strain (less galactosylated) exhibited lower infection intensity compared to BH49 and FV1 in both vectors. MAIN CONCLUSIONS Intraspecific variation in the LPG of L. major-like strains occur, and the different galactosylation levels affected interactions with the invertebrate host.

https://doi.org/10.1590/0074-02760170333 861 downloads

Quality perception in research laboratories from Fiocruz after QMS implementation
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Presot, Ivanete Milagres

; Soares, Rodrigo Pedro Pinto

; Madureira, Ana Paula

; Bicalho, Kelly Alves

; Modena, Celina Maria

Revista de Administração Pública

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Fev 2014, Volume 48 Nº 1 Páginas 237 - 252

Resumo: Pt En Es | Texto: Pt En Es | PDF: Pt | PDF: En | PDF: Es

O Sistema de Gestão da Qualidade vem sendo implementado no Centro de Pesquisas René Rachou desde 2003. Este estudo investigou sua importância para os colaboradores dos laboratórios de pesquisa. Tratou-se de um estudo quantitativo, descritivo, realizado com um grupo de 113 colaboradores. Utilizou-se a diretriz Práticas de Qualidade na Pesquisa Biomédica Básica (QPBR), da Organização Mundial de Saúde. Os questionários aplicados avaliaram os parâmetros dessa diretriz utilizando a escala Likert. Biossegurança, treinamento e ética foram os fatores considerados mais importantes. Supervisão e garantia da Qualidade, registro de dados, plano de estudo, POP e arquivo obtiveram uma avaliação intermediária. A menor avaliação foi obtida para relatório, verificação de resultados, pessoal e práticas de publicação. Entender a percepção dos colaboradores permitirá o desenvolvimento de ações de melhoria, contribuindo para a construção de um programa de treinamento e estratégias de disseminação da qualidade.

Quality Management System has been implemented at the René Rachou Research Center since 2003. This study investigated its importance for collaborators (Cs) in laboratories. This was a quantitative and descriptive study performed in a group of 113 collaborators. It was based on the World Health Organization handbook: Quality Practices in Basic Biomedical Research. The questionnaires evaluated the parameters using the Likert scale. Biosafety, training and ethics were considered to be the most important parameters. Supervision and quality assurance, data recording, study plan, SOPs and file storage achieved intermediate evaluation. The lower frequency of responses was obtained for result report, result verification, personnel and publishing practices. Understanding the perception of the collaborators allows the development of improvement actions aiming the construction of a training program directing strategies for disseminating quality.

El Sistema de Gestión de la Calidad ha sido implementado en el Centro de Investigación René Rachou desde el año 2003. En este estudio se investigó la importancia de dicho sistema para los trabajadores de los laboratorios de investigación. Se realizó un estudio de tipo cuantitativo, descriptivo con un grupo de 113 trabajadores. Fueron utilizadas las guías sobre Prácticas de Calidad en Investigación Biomédica Básica (QPBR) de la Organización Mundial de la Salud. El cuestionario evalúa los parámetros de esta guía utilizando la Escala Likert. Bioseguridad, formación y ética fueron los factores considerados como los más importantes dentro del cuestionario. Supervisión y Control de calidad, registro de datos, plan de estudios, POP y el archivo obtuvieron una puntuación intermedia. La puntuación más baja fue obtenida por el informe, la verificación de resultados, el personal y las prácticas de publicación. Conocer las opiniones de los trabajadores permitirá el desarrollo de acciones para la mejora del Sistema de Gestión de la Calidad, contribuyendo al desarrollo de un programa de capacitación y de estrategias para la difusión de la calidad.

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alpha-glycerophosphate dehydrogenase activity in flight muscles of triatomine bugs Panstrongylus megistus and Triatoma sordida
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Soares, Rodrigo Pedro Pinto

; Santoro, Marcelo Matos

Memórias do Instituto Oswaldo Cruz

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Out 2000, Volume 95 Nº 5 Páginas 707 - 709

Resumo: En | Texto: En | PDF: En

The alpha-glycerophosphate dehydrogenase (alpha-GPDH) activity in flight muscles of Panstrongylus megistus and Triatoma sordida, vectors of Chagas disease in Brazil, was studied. Both species showed higher enzymatic activities in fliers than in non-fliers insects. T. sordida exhibited a higher proportion of flier insects than P. megistus. A possible role of alpha-GPDH on triatomines flight is discussed.

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Population dynamics and feeding behavior of Triatoma brasiliensis and Triatoma pseudomaculata, main vectors of Chagas disease in Northeastern Brazil
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Soares, Rodrigo Pedro Pinto

; Evangelista, Luciene das Graças

; Laranja, Luciano Soares

; Diotaiuti, Liléia

Memórias do Instituto Oswaldo Cruz

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Abr 2000, Volume 95 Nº 2 Páginas 151 - 155

Resumo: En | Texto: En | PDF: En

Biological parameters of Triatoma brasiliensis and T. pseudomaculata that could influence the epidemiological importance of these insects as vectors of Trypanosoma cruzi were compared. The parameters studied were incubation period, interval between hatching or moulting and first feeding, number of blood meals, development time, mortality, net reproductive rate, instantaneous daily reproductive rate, time-lapse before starting feeding, duration of feeding, blood ingestion capacity, occurrence of defecation and blood ingestion velocity. Most aspects of feeding were similar for the two species, although T. pseudomaculata had a longer life cycle than T. brasiliensis producing one and two generations per year, respectively. The two species had similar instantaneous daily rates of population growth.

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Characterization of Rhodnius neglectus from Two Regions of Brazil Using Isoenzymes, Genitalia Morphology and Morphometry
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Soares, Rodrigo Pedro Pinto

; Barbosa, Silvia Ermelinda

; Dujardin, Jean-Pierre

; Schofield, Christopher John

; Siqueira, Ariovaldo Moura

; Diotaiuti, Liléia

Memórias do Instituto Oswaldo Cruz

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Mar 1999, Volume 94 Nº 2 Páginas 161 - 166

Resumo: En | Texto: En | PDF: En

Among the triatomines considered as secondary in the epidemiology of Chagas disease, Rhodnius neglectus is frequently captured in artificial ecotopes, especially peridomiciliary ones, rarely producing colonies indoors. Nevertheless, the presence of breeding colonies in houses was unquestionably demonstrated in some areas of the State of Goiás, Brazil. Previous isoenzyme comparisons of this species with morphologically close triatomines, such as R. prolixus, R. robustus or R. nasutus, did not produce definitive conclusions because of doubt about the geographical origin of the R. neglectus. We present here, for the first time, the isoenzyme profile of topotypes of R. neglectus. In addition, wild caught specimens from the type locality, Uberaba (Minas Gerais, Brazil), were compared to wild caught specimens from Jaraguá (Goiás, Brazil), where R. neglectus is more frequently reported invading houses. We used isoenzyme, morphology and morphometry analysis. Neither morphological nor enzymatic differences were found between areas, but metric, size-related divergence was evidenced between them.

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