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Leishmania spp. genetic factors associated with cutaneous leishmaniasis antimony pentavalent drug resistance: a systematic review. 与皮肤利什曼病五价锑抗药性相关的利什曼属遗传因素:系统综述。
IF 2.5 4区 医学
Memorias do Instituto Oswaldo Cruz Pub Date : 2024-09-02 eCollection Date: 2024-01-01 DOI: 10.1590/0074-02760230240
Raphaela Lisboa Andrade Nery, Thaline Mabel Sousa Santos, Luana Leandro Gois, Aldina Barral, Ricardo Khouri, Caroline Alves Feitosa, Luciane Amorim Santos
{"title":"Leishmania spp. genetic factors associated with cutaneous leishmaniasis antimony pentavalent drug resistance: a systematic review.","authors":"Raphaela Lisboa Andrade Nery, Thaline Mabel Sousa Santos, Luana Leandro Gois, Aldina Barral, Ricardo Khouri, Caroline Alves Feitosa, Luciane Amorim Santos","doi":"10.1590/0074-02760230240","DOIUrl":"10.1590/0074-02760230240","url":null,"abstract":"<p><strong>Background: </strong>Leishmaniasis is a neglected zoonosis caused by parasites of Leishmania spp. The main drug used to treat cutaneous leishmaniasis (CL) is the antimoniate of meglumine. This drug, which has strong adverse and toxic effects, is usually administered intravenously, further complicating the difficult treatment. Factors such as Leishmania gene expression and genomic mutations appear to play a role in the development of drug resistance.</p><p><strong>Objectives: </strong>This systematic review summarises the results of the literature evaluating parasite genetic markers possibly associated with resistance to pentavalent antimony in CL.</p><p><strong>Methods: </strong>This study followed PRISMA guidelines and included articles from PubMed, SciELO, and LILACS databases. Inclusion criteria were studies that (i) investigated mutations in the genome and/or changes in gene expression of Leishmania associated with treatment resistance; (ii) used antimony drugs in the therapy of CL; (iii) used naturally resistant strains isolated from patients. The Joanna Briggs Institute Critical Appraisal Checklist was used to assess article quality and risk of bias.</p><p><strong>Findings: </strong>A total of 23 articles were selected, of which 18 investigated gene expression and nine genomic mutations. Of these 23 articles, four examined gene expression and genomic mutations in the same samples. Regarding gene expression, genes from the ABC transporter protein family, AQP1, MRPA, TDR1 and TRYR were most frequently associated with drug resistance. In one of the articles in which mutations were investigated, a mutation was found in HSP70 (T579A) and in three articles mutations were found in AQP1 (A516C, G562A and G700A). A limitation of this review is that in most of the included studies, parasites were isolated from cultured lesion samples and drug resistance was assessed using in vitro drug susceptibility testing. These approaches may not be ideal for accurate genetic evaluation and detection of treatment failure.</p><p><strong>Main conclusions: </strong>The development of further studies to evaluate the genetic resistance factors of Leishmania spp. is necessary to elucidate the mechanisms of the parasite and improve patient treatment and infection control.</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"119 ","pages":"e230240"},"PeriodicalIF":2.5,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11370656/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142126174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Irrigation, migration and infestation: a case study of Chagas disease vectors and bed bugs in El Pedregal, Peru. 灌溉、迁移和虫害:秘鲁 El Pedregal 恰加斯病病媒和臭虫个案研究。
IF 2.5 4区 医学
Memorias do Instituto Oswaldo Cruz Pub Date : 2024-09-02 eCollection Date: 2024-01-01 DOI: 10.1590/0074-02760240002
Raquel Gonçalves, Kathryn P Hacker, Carlos Condori, Sherrie Xie, Katty Borrini-Mayori, Lina Mollesaca Riveros, Roger Quispe Apaza, Manuel Ysidro Arratea, Gustavo Nativio, Ricardo Castillo-Neyra, Valerie A Paz-Soldan, Michael Z Levy
{"title":"Irrigation, migration and infestation: a case study of Chagas disease vectors and bed bugs in El Pedregal, Peru.","authors":"Raquel Gonçalves, Kathryn P Hacker, Carlos Condori, Sherrie Xie, Katty Borrini-Mayori, Lina Mollesaca Riveros, Roger Quispe Apaza, Manuel Ysidro Arratea, Gustavo Nativio, Ricardo Castillo-Neyra, Valerie A Paz-Soldan, Michael Z Levy","doi":"10.1590/0074-02760240002","DOIUrl":"10.1590/0074-02760240002","url":null,"abstract":"<p><strong>Background: </strong>The city of El Pedregal grew out of a desert, following an agricultural irrigation project in southern Peru.</p><p><strong>Objectives: </strong>To describe infestation patterns by triatomines and bed bugs and their relationship to migration and urbanization.</p><p><strong>Methods: </strong>We conducted door-to-door entomological surveys for triatomines and bed bugs. We assessed spatial clustering of infestations and compared the year of construction of infested to un-infested households. To gain a better understanding of the context surrounding triatomine infestations, we conducted in-depth interviews with residents to explore their migration histories, including previous experiences with infestation.</p><p><strong>Findings: </strong>We inspected 5,164 households for Triatoma infestans (known locally as the Chirimacha); 21 (0.41%) were infested. These were extremely spatially clustered (Ripley's K p-value < 0.001 at various spatial scales). Infested houses were older than controls (Wilcoxon rank-sum: W = 33; p = 0.02). We conducted bed bug specific inspections in 34 households; 23 of these were infested. These were spatially dispersed across El Pedregal, and no difference was observed in construction age between bed bug infested houses and control houses (W = 6.5, p = 0.07).</p><p><strong>Main conclusions: </strong>The establishment of agribusiness companies in a desert area demanded a permanent work force, leading to the emergence of a new city. Migrant farmers, seeking work opportunities or escaping from adverse climatic events, arrived with few resources, and constructed their houses with precarious materials. T. infestans, a Chagas disease vector, was introduced to the city and colonized houses, but its dispersal was constrained by presence of vacant houses. We discuss how changes in the socioeconomic and agricultural landscape can increase vulnerability to vector-borne illnesses.</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"119 ","pages":"e240002"},"PeriodicalIF":2.5,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11370655/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142126157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
You are what you eat: a systematic review exploring the interaction between Brazilian sand flies and their vertebrate food sources. 你吃什么,你就是什么:探索巴西沙蝇与其脊椎动物食物来源之间相互作用的系统综述。
IF 2.5 4区 医学
Memorias do Instituto Oswaldo Cruz Pub Date : 2024-08-30 eCollection Date: 2024-01-01 DOI: 10.1590/0074-02760240055
Felipe Dutra-Rêgo, Michelli Santos da Silva, Ana Paula Isnard, Jansen Fernandes Medeiros, José Dilermando Andrade Filho, Mariana Lourenço Freire
{"title":"You are what you eat: a systematic review exploring the interaction between Brazilian sand flies and their vertebrate food sources.","authors":"Felipe Dutra-Rêgo, Michelli Santos da Silva, Ana Paula Isnard, Jansen Fernandes Medeiros, José Dilermando Andrade Filho, Mariana Lourenço Freire","doi":"10.1590/0074-02760240055","DOIUrl":"10.1590/0074-02760240055","url":null,"abstract":"<p><p>Sand flies play a crucial role as vectors of bacteria, viruses, and protists, with Leishmania being the most notable among them, transmitted to vertebrate hosts during blood feeding. Understanding the feeding behaviours of sand flies is imperative for gaining insights into their eco-epidemiological roles in the transmission of these infectious agents. This systematic review aimed to answer the question 'What are the blood-feeding sources identified in Brazilian sand flies?' to provide an analysis of their blood-feeding habits. The diverse range of at least 16 vertebrate orders identified as blood sources for 54 sand fly species across different geographic regions was summarised, and the factors potentially associated with the risk of bias in the included studies were analysed. The findings broaden the discussion concerning methods used to identify blood meal sources and shed light on the implications of sand fly feeding behaviours for the transmission dynamics of Leishmania.</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"119 ","pages":"e240055"},"PeriodicalIF":2.5,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11368077/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142126175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Iron and vitamin D intake on a diet are able to modify the in vitro immune response to Mycobacterium leprae. 饮食中摄入的铁和维生素 D 能够改变对麻风分枝杆菌的体外免疫反应。
IF 2.5 4区 医学
Memorias do Instituto Oswaldo Cruz Pub Date : 2024-08-16 eCollection Date: 2024-01-01 DOI: 10.1590/0074-02760230178
Bruna Letícia Martins, Jonatas Perico, Daniele Ferreira de Faria Bertoluci, Adriana Sierra Assencio Almeida Barbosa, Patricia Sammarco Rosa, Maria Renata Sales Nogueira, Vânia Nieto Brito de Souza, Ana Carla Pereira Latini
{"title":"Iron and vitamin D intake on a diet are able to modify the in vitro immune response to Mycobacterium leprae.","authors":"Bruna Letícia Martins, Jonatas Perico, Daniele Ferreira de Faria Bertoluci, Adriana Sierra Assencio Almeida Barbosa, Patricia Sammarco Rosa, Maria Renata Sales Nogueira, Vânia Nieto Brito de Souza, Ana Carla Pereira Latini","doi":"10.1590/0074-02760230178","DOIUrl":"10.1590/0074-02760230178","url":null,"abstract":"<p><strong>Background: </strong>The impact of nutrient availability on the survival of Mycobacterium leprae and the development of leprosy remains largely unknown. Iron is essential for the survival and replication of pathogens, while vitamin D has been involved with pathogen elimination and immunoregulation.</p><p><strong>Objectives: </strong>We evaluated the influence of dietary iron and vitamin D supplementation and restriction on the inflammatory response of mouse immune cells in vitro.</p><p><strong>Methods: </strong>After 30 days of standard or modified diets, peritoneal cells and splenocytes were stimulated with the alive microorganisms and sonicated antigens of M. leprae, respectively. The production of inflammatory cytokines, reactive oxygen species, and cell proliferation were evaluated.</p><p><strong>Findings: </strong>In peritoneal cells, vitamin D supplementation and iron restriction reduced the production of IL-6 and TNF in response to M. leprae, while splenocytes presented a reduction in TNF production under the same conditions. Lower levels of IFN-γ and TNF were observed in both iron-supplemented and iron-deficient splenocytes. Besides, iron supplementation also reduced the production of IL-6 and IL-10. No changes in the production of reactive oxygen species or in cell proliferation were observed related to different diets.</p><p><strong>Main conclusions: </strong>Taken together, these data point to an interference of the status of these nutrients on the interaction between the host and M. leprae, with the potential to interfere with the progression of leprosy. Our results highlight the impact of nutritional aspects on this neglected disease, which is significantly associated with unfavourable social conditions.</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"119 ","pages":"e230178"},"PeriodicalIF":2.5,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11329276/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142017962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sublingual microcirculatory alterations in Chagas disease: an observational study in an endemic rural population. 恰加斯病的舌下微循环改变:一项针对农村流行病人群的观察性研究。
IF 2.5 4区 医学
Memorias do Instituto Oswaldo Cruz Pub Date : 2024-08-02 eCollection Date: 2024-01-01 DOI: 10.1590/0074-02760240018
Jorge Emilio De All, Juan Francisco Caminos Eguillor, Simón Marcelo Cohen, Héctor Freilij, Arnaldo Dubin
{"title":"Sublingual microcirculatory alterations in Chagas disease: an observational study in an endemic rural population.","authors":"Jorge Emilio De All, Juan Francisco Caminos Eguillor, Simón Marcelo Cohen, Héctor Freilij, Arnaldo Dubin","doi":"10.1590/0074-02760240018","DOIUrl":"10.1590/0074-02760240018","url":null,"abstract":"<p><strong>Background: </strong>Chagas disease is a systemic illness with widespread microvascular involvement. Experimental and clinical studies suggest that functional and structural microcirculatory abnormalities might be relevant to the disease progression.</p><p><strong>Objectives: </strong>To show the presence of sublingual microcirculatory alterations in patients with chronic Chagas disease.</p><p><strong>Methods: </strong>This was a cross-sectional study including adult patients with serologic diagnosis of Chagas disease (n = 41) and control volunteers with negative serology (n = 38), from an endemic rural population. Study participants underwent clinical, electrocardiographic, echocardiographic, and sublingual videomicroscopic assessment. Videos were acquired by a sidestream-dark-field (SDF) imaging device and evaluated by a software-assisted analysis (AVA 3.2 software).</p><p><strong>Findings: </strong>Most of Chagas disease patients were in the indeterminate phase (n = 34) and had lower heart rate and more echocardiographic abnormalities than control group (50 vs. 26%, p = 0.03). They also exhibited higher small microvessels total and perfused vascular density (20.12 ± 2.33 vs. 19.05 ± 2.25 and 20.03 ± 2.28 vs. 19.01 ± 2.25 mm/mm2, p < 0.05 for both). Other microvascular variables did not differ between groups.</p><p><strong>Main conclusions: </strong>Patients with chronic Chagas disease exhibited increases in sublingual total and perfused microvascular density. Angiogenesis might be the underlying mechanism. The videomicroscopic assessment of mucosal sublingual microcirculation might be an additional tool in the monitoring of Chagas disease.</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"119 ","pages":"e240018"},"PeriodicalIF":2.5,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11304841/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141897752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
ERRATUM. 错误。
IF 2.5 4区 医学
Memorias do Instituto Oswaldo Cruz Pub Date : 2024-07-29 DOI: 10.1590/0074-02760240057er
{"title":"ERRATUM.","authors":"","doi":"10.1590/0074-02760240057er","DOIUrl":"10.1590/0074-02760240057er","url":null,"abstract":"<p><p>[This corrects the article doi: 10.1590/0074-02760240057].</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"119 ","pages":"e240057er"},"PeriodicalIF":2.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11285857/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141855993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Endocytosis in anaerobic parasitic protists. 厌氧寄生原生动物的内吞作用。
IF 2.5 4区 医学
Memorias do Instituto Oswaldo Cruz Pub Date : 2024-07-26 eCollection Date: 2024-01-01 DOI: 10.1590/0074-02760240058
Marlene Benchimol, Wanderley de Souza
{"title":"Endocytosis in anaerobic parasitic protists.","authors":"Marlene Benchimol, Wanderley de Souza","doi":"10.1590/0074-02760240058","DOIUrl":"10.1590/0074-02760240058","url":null,"abstract":"<p><p>The incorporation of different molecules by eukaryotic cells occurs through endocytosis, which is critical to the cell's survival and ability to reproduce. Although this process has been studied in greater detail in mammalian and yeast cells, several groups working with pathogenic protists have made relevant contributions. This review analysed the most relevant data on the endocytic process in anaerobic protists (Entamoeba histolytica, Giardia intestinalis, Trichomonas vaginalis, and Tritrichomonas foetus). Many protozoa can exert endocytic activity across their entire surface and do so with great intensity, as with E. histolytica. The available data on the endocytic pathway and the participation of PI-3 kinase, Rab, and Rho molecular complexes is reviewed from a historical perspective.</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"119 ","pages":"e240058"},"PeriodicalIF":2.5,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11285859/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141855955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Cytopathic effects in Mimivirus infection: understanding the kinetics of virus-cell interaction. 米米病毒感染的细胞病理效应:了解病毒与细胞相互作用的动力学。
IF 2.5 4区 医学
Memorias do Instituto Oswaldo Cruz Pub Date : 2024-07-22 eCollection Date: 2024-01-01 DOI: 10.1590/0074-02760230186
Gabriel Henrique Pereira Nunes, Juliana Dos Santos Oliveira, Victor Alejandro Essus, Allan J Guimarães, Bruno Pontes, Juliana Reis Cortines
{"title":"Cytopathic effects in Mimivirus infection: understanding the kinetics of virus-cell interaction.","authors":"Gabriel Henrique Pereira Nunes, Juliana Dos Santos Oliveira, Victor Alejandro Essus, Allan J Guimarães, Bruno Pontes, Juliana Reis Cortines","doi":"10.1590/0074-02760230186","DOIUrl":"10.1590/0074-02760230186","url":null,"abstract":"<p><strong>Background: </strong>Giant viruses have brought new insights into different aspects of virus-cell interactions. The resulting cytopathic effects from these interactions are one of the main aspects of infection assessment in a laboratory routine, mainly reflecting on the morphological features of an infected cell.</p><p><strong>Objectives: </strong>In this work, we follow the entire kinetics of the cytopathic effect in cells infected by viruses of the Mimiviridae family, spatiotemporally quantifying typical features such as cell roundness, loss of motility, decrease in cell area and cell lysis.</p><p><strong>Methods: </strong>Infections by Acanthamoeba polyphaga mimivirus (APMV), Tupanvirus (TPV) and M4 were carried out at multiplicity of infection (MOI) 1 and MOI 10 in Acanthamoeba castellanii. Monitoring of infections was carried out using time lapse microscopy for up to 72 hours. The images were analyzed using ImageJ software.</p><p><strong>Findings: </strong>The data obtained indicate that APMV is the slowest virus in inducing the cytopathic effects of rounding, decrease in cell area, mobility and cell lysis. However, it is the only virus whose MOI increase accelerates the lysis process of infected cells. In turn, TPV and M4 rapidly induce morphological and behavioral changes.</p><p><strong>Main conclusions: </strong>Our results indicate that mimiviruses induce different temporal responses within the host cell and that it is possible to use these kinetic data to facilitate the understanding of infection by these viruses.</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"119 ","pages":"e230186"},"PeriodicalIF":2.5,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11285858/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141752063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Assessing proteases and enzymes of the trypanothione system in subpopulations of Leishmania (Viannia) braziliensis Thor strain during macrophage infection. 评估巨噬细胞感染期间巴西利什曼病(Viannia)Thor 株亚群中的蛋白酶和锥硫蛋白系统酶。
IF 2.5 4区 医学
Memorias do Instituto Oswaldo Cruz Pub Date : 2024-07-08 eCollection Date: 2024-01-01 DOI: 10.1590/0074-02760240038
Barbara Cristina de Albuquerque-Melo, Bernardo Acácio Santini Pereira, Vítor Ennes-Vidal, Maria Eduarda Pinto Gonçalves, Luzia Monteiro de Castro Côrtes, Léa Cysne-Finkelstein, Herbert Leonel de Matos Guedes, Geovane Dias-Lopes, Carlos Roberto Alves
{"title":"Assessing proteases and enzymes of the trypanothione system in subpopulations of Leishmania (Viannia) braziliensis Thor strain during macrophage infection.","authors":"Barbara Cristina de Albuquerque-Melo, Bernardo Acácio Santini Pereira, Vítor Ennes-Vidal, Maria Eduarda Pinto Gonçalves, Luzia Monteiro de Castro Côrtes, Léa Cysne-Finkelstein, Herbert Leonel de Matos Guedes, Geovane Dias-Lopes, Carlos Roberto Alves","doi":"10.1590/0074-02760240038","DOIUrl":"10.1590/0074-02760240038","url":null,"abstract":"<p><strong>Background: </strong>Leishmania (Viannia) braziliensis Thor strain exhibits a heterogeneous composition comprised of subpopulations with varying levels of infectivity. Clonal subpopulations were previously obtained from the strain Thor by sorting single-parasites and proceeding cultivation. The subpopulations used in this study are named Thor03, Thor 10 and Thor22.</p><p><strong>Objectives: </strong>Phenotypic characteristics of the parasite, specially focusing on virulence factors and resistance to the antimicrobial mechanisms of macrophages, were investigate in these subpopulations.</p><p><strong>Methods: </strong>Cellular and molecular biology, as well as biochemistry approaches were applied to obtain the data analysed in this study.</p><p><strong>Findings: </strong>Relative quantification of gene expression was measured for calpain, cysteine protease B (CPB), and subtilisin proteases but no significant differences in these genes' expression among subpopulations was observed. However, subtilisin and CPB proteins were assessed as more abundant in Thor03 by fluorescence-labelled flow cytometry technique. Western Blotting assays, as semi-quantitative analysis in gel, showed higher concentrations of subtilisin (110 to 50 kDa) and CPB (40 to 18 kDa) in extract of intracellular amastigotes from subpopulations Thor03 and Thor10 and calpain (60 to 25 kDa) showed no significant differences among subpopulations. Complementary, higher trypanothione reductase activity was observed in Thor10 intracellular amastigotes and assays of susceptibility to hydrogen peroxide-inducing agents and nitric oxide donors conducted with promastigotes revealed greater resistance to in vitro oxidative stress induction for Thor10, followed by Thor03.</p><p><strong>Main conclusions: </strong>The data obtained for the virulence factors explored here suggest how multiple coexisting phenotypic-distinct subpopulations may contribute in adaptability of a single L. (V.) braziliensis strain during infection in the host cells.</p>","PeriodicalId":18469,"journal":{"name":"Memorias do Instituto Oswaldo Cruz","volume":"119 ","pages":"e240038"},"PeriodicalIF":2.5,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11251415/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141563744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Isolation and characterisation of Leishmania (Leishmania) infantum from cutaneous leishmaniasis patients in northeast Brazil. 从巴西东北部皮肤利什曼病患者体内分离出婴儿利什曼原虫并确定其特征。
IF 2.5 4区 医学
Memorias do Instituto Oswaldo Cruz Pub Date : 2024-07-08 eCollection Date: 2024-01-01 DOI: 10.1590/0074-02760240026
Gustavo Henrique Corrêa Soares, Gustavo Rolim Barbosa, Ana Jessica Sousa Coelho, Giovanna Bedin Caetano, Conceição de Maria Pedrozo E Silva de Azevedo, Adriano Cappellazzo Coelho, Mayara Ingrid Souza Lima, Beatriz Simonsen Stolf
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