Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 188
Filtrar
1.
PLoS Negl Trop Dis ; 18(7): e0012318, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-39028711

RESUMO

In the Americas, L. infantum (syn. chagasi) is the main cause of human visceral leishmaniasis. The role of neutrophils as part of the innate response to Leishmania spp. infection is dubious and varies according to the species causing the infection. Global expression of coding RNAs, microRNAs and long non-coding RNAs changes as part of the immune response against pathogens. Changes in mRNA and non-coding RNA expression resulting from infection by Leishmania spp. are widely studied in macrophages, but scarce in neutrophils, the first cell to encounter the trypanosomatid, especially following infection by L. infantum. Herein, we aimed to understand the expression patterns of coding and non-coding transcripts during acute in vitro infection of human neutrophils by L. infantum. We isolated neutrophils from whole blood of healthy male donors (n = 5) and split into groups: 1) infected with L. infantum (MOI = 5:1), and 2) uninfected controls. After 3 hours of exposure of infected group to promastigotes of L. infantum, followed by 17 hours of incubation, total RNA was extracted and total RNA-Seq and miRNA microarray were performed. A total of 212 genes were differentially expressed in neutrophils following RNA-Seq analysis (log2(FC)±0.58, FDR≤0.05). In vitro infection with L. infantum upregulated the expression of 197 and reduced the expression of 92 miRNAs in human neutrophils (FC±2, FDR≤0.01). Lastly, 5 downregulated genes were classified as lncRNA, and of the 10 upregulated genes, there was only 1 lncRNA. Further bioinformatic analysis indicated that changes in the transcriptome and microtranscriptome of neutrophils, following in vitro infection with L. infantum, may impair phagocytosis, apoptosis and decrease nitric oxide production. Our work sheds light on several mechanisms used by L. infantum to control neutrophil-mediated immune response and identifies several targets for future functional studies, aiming at the development of preventive or curative treatments for this prevalent zoonosis.


Assuntos
Leishmania infantum , MicroRNAs , Neutrófilos , RNA Longo não Codificante , RNA Mensageiro , Humanos , Neutrófilos/imunologia , Neutrófilos/metabolismo , Leishmania infantum/genética , Leishmania infantum/imunologia , RNA Longo não Codificante/genética , MicroRNAs/genética , Masculino , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Leishmaniose Visceral/imunologia , Leishmaniose Visceral/parasitologia , Leishmaniose Visceral/genética , Adulto , Perfilação da Expressão Gênica
2.
PLoS Negl Trop Dis ; 18(1): e0011789, 2024 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-38241360

RESUMO

Domestic dogs are the primary urban reservoirs of Leishmania infantum, the causative agent of visceral leishmaniasis. In Canine Leishmaniasis (CanL), modulation of the host's immune response may be associated with the expression of small non-coding RNAs called microRNA (miR). miR-194 expression increases in peripheral blood mononuclear cells (PBMCs) of dogs with leishmaniasis with a positive correlation with the parasite load and in silico analysis demonstrated that the TRAF6 gene is the target of miR-194 in PBMCs from diseased dogs. Here, we isolated PBMCs from 5 healthy dogs and 28 dogs with leishmaniasis, naturally infected with L. infantum. To confirm changes in miR-194 and TRAF6 expression, basal expression of miR-194 and gene expression of TRAF6 was measured using qPCR. PBMCs from healthy dogs and dogs with leishmaniasis were transfected with miR-194 scramble, mimic, and inhibitor and cultured at 37° C, 5% CO2 for 48 hours. The expression of possible targets was measured: iNOS, NO, T-bet, GATA3, and FoxP3 were measured using flow cytometry; the production of cytokines IL-1ß, IL-4, IL-6, IL-10, TNF-α, IFN-γ, and TGF-ß in cell culture supernatants was measured using capture enzyme-linked immunosorbent assays (ELISA). Parasite load was measured using cytometry and qPCR. Functional assays followed by miR-194 inhibitor and IL-1ß blockade and assessment of NO production were also performed. Basal miR-194 expression was increased in PBMC from dogs with Leishmaniasis and was negatively correlated with TRAF6 expression. The mimic of miR-194 promoted an increase in parasite load. There were no significant changes in T-bet, GATA3, or FoxP3 expression with miR-194 enhancement or inhibition. Inhibition of miR-194 increased IL-1ß and NO in PBMCs from diseased dogs, and blockade of IL-1ß following miR-194 inhibition decreased NO levels. These findings suggest that miR-194 is upregulated in PBMCs from dogs with leishmaniasis and increases parasite load, possibly decreasing NO production via IL-1ß. These results increase our understanding of the mechanisms of evasion of the immune response by the parasite and the identification of possible therapeutic targets.


Assuntos
Doenças do Cão , Leishmania infantum , Leishmaniose Visceral , Leishmaniose , MicroRNAs , Animais , Cães , Citocinas/genética , Doenças do Cão/parasitologia , Fatores de Transcrição Forkhead , Leishmania infantum/fisiologia , Leishmaniose Visceral/genética , Leishmaniose Visceral/veterinária , Leucócitos Mononucleares , MicroRNAs/genética , Óxido Nítrico/metabolismo , Carga Parasitária , Fator 6 Associado a Receptor de TNF , Leishmaniose/veterinária , Interleucina-1beta/metabolismo
3.
Pathogens ; 12(12)2023 Nov 27.
Artigo em Inglês | MEDLINE | ID: mdl-38133278

RESUMO

We investigated the zoonotic transmission of Cryptosporidium among the children (n = 188), dogs (n = 133), and cats (n = 55) living in 188 households. Fecal samples were examined using ELISA and confirmed via nested PCR. Coproantigens oocysts were detected in 3.7% of children, 8.3% of dogs, and 5.5% of cats. We found strong evidence of two cases of the zoonotic transmission of Cryptosporidium canis between children and dogs. Furthermore, four children and their respective pets (one dog and three cats) were infected with Cryptosporidium parvum, but we cannot exclude the hypotheses that the oocysts were transmitted from children to animals or that both hosts were infected by a shared source, such as contaminated water or food. The presence of an infected animal elevated the risk of zoonotic transmission by 129.7-fold (95% CI: 13.92-1209.68). Furthermore, sharing a bed with pets was identified as a risk factor for infection in children (OR: 9.9, 95% CI: 1.37-71.2). In conclusion, the zoonotic transmission of Cryptosporidium among children and pets cohabiting in the same household may be quite common, especially when infected animals lie or sleep on children's beds. These findings unequivocally highlight the public health concern surrounding C. canis.

4.
Vet Sci ; 10(10)2023 Oct 07.
Artigo em Inglês | MEDLINE | ID: mdl-37888560

RESUMO

Dogs are considered the major domestic reservoir for human visceral leishmaniasis, a serious disease caused by the Leishmania infantum parasite. Diagnosis of canine visceral leishmaniasis (CVL) is critical for disease control, with several methods currently available. Among the serological tests, the DPP rapid test and the EIE-LVC, more commonly used in Brazil, are associated with variable sensitivity and specificity. Research with novel recombinant proteins such as the ELISA with the recombinant chimeric protein Q5 may therefore improve the CVL diagnosis. This study aimed to evaluate the true diagnostic potential of Q5 in an ELISA assay using a large number of CVL-suspected sera (406) with a previous positive diagnosis based on the rapid DPP test. Sera from the DPP-positive dogs, also assessed with the EIE-LVC test, were compared with sera from healthy dogs (n = 46) and used for ELISA tests using the recombinant Q5. The resulting data as well as the correlation with the clinical signs and the environmental characteristics of the animals were analyzed using Medal and GraphPad Prism 8.0. Overall, similar levels of lower sensitivity (67-68%) were seen for both the commercial EIE-LVC test and the Q5 ELISA when all assessed sera were considered, but a much greater sensitivity (92%) was seen for those samples from symptomatic dogs only. In contrast, many negative results were observed for the DPP-positive sera from asymptomatic dogs or those with no clinical information available. A selection of those sera were tested yet again in new ELISA assays using a second batch of the recombinant Q5, purified under milder denaturing conditions, as well as using another recombinant protein (Lci13). The results reveal a higher-than-expected incidence of likely false-positive results for DPP, reinforcing the need for other recombinant proteins, such as the chimeric Q5, to be investigated as possible alternatives to the currently used CVL diagnostic methods.

5.
Plant Physiol Biochem ; 201: 107862, 2023 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-37413941

RESUMO

Evidence suggests that guard cells have higher rate of phosphoenolpyruvate carboxylase (PEPc)-mediated dark CO2 assimilation than mesophyll cells. However, it is unknown which metabolic pathways are activated following dark CO2 assimilation in guard cells. Furthermore, it remains unclear how the metabolic fluxes throughout the tricarboxylic acid (TCA) cycle and associated pathways are regulated in illuminated guard cells. Here we carried out a13C-HCO3 labelling experiment in tobacco guard cells harvested under continuous dark or during the dark-to-light transition to elucidate principles of metabolic dynamics downstream of CO2 assimilation. Most metabolic changes were similar between dark-exposed and illuminated guard cells. However, illumination altered the metabolic network structure of guard cells and increased the 13C-enrichment in sugars and metabolites associated to the TCA cycle. Sucrose was labelled in the dark, but light exposure increased the 13C-labelling and leads to more drastic reductions in the content of this metabolite. Fumarate was strongly labelled under both dark and light conditions, while illumination increased the 13C-enrichment in pyruvate, succinate and glutamate. Only one 13C was incorporated into malate and citrate in either dark or light conditions. Our results indicate that several metabolic pathways are redirected following PEPc-mediated CO2 assimilation in the dark, including gluconeogenesis and the TCA cycle. We further showed that the PEPc-mediated CO2 assimilation provides carbons for gluconeogenesis, the TCA cycle and glutamate synthesis and that previously stored malate and citrate are used to underpin the specific metabolic requirements of illuminated guard cells.


Assuntos
Dióxido de Carbono , Malatos , Malatos/metabolismo , Dióxido de Carbono/metabolismo , Células do Mesofilo/metabolismo , Fosfoenolpiruvato Carboxilase/metabolismo , Citratos/metabolismo
6.
Artigo em Inglês | MEDLINE | ID: mdl-37396195

RESUMO

[This corrects the article DOI: 10.1017/ash.2023.136.].

7.
Animals (Basel) ; 13(13)2023 Jun 22.
Artigo em Inglês | MEDLINE | ID: mdl-37443858

RESUMO

Visceral canine leishmaniasis (CanL) can cause several clinical manifestations, including neurological lesions. Few reports have characterized the lesions observed in the central nervous system (CNS) during CanL; however, its pathogenesis remains unclear. The choroid plexus (CP) is a specialized structure responsible for the production and secretion of cerebrospinal fluid (CSF) and considered an interface between the peripheral immune system and CNS. It can allow the passage of inflammatory cells or pathogens and has the potential to act as a source of inflammatory mediators in several diseases. Thus, this study aimed to evaluate the role of CP as a possible route of inflammatory cells in the development of brain lesions in dogs with CanL, as well as its association with blood-CSF barrier (BCSFB) dysfunction. Samples were collected from 19 dogs that were naturally infected with CanL. We evaluated the histopathological lesions in the brain and investigated the gene expression of the cytokines. Capture enzyme-linked immunosorbent assay (ELISA) was used to evaluate the presence of the same cytokines in the CSF. Biochemical analysis was performed to compare the presence of albumin in the serum and CSF. Indirect ELISA was performed to measure the presence of anti-Leishmania antibodies in the CSF, which would suggest the disruption of the BCSFB. Histopathological evaluation of the dogs' brains revealed mild-to-severe inflammatory infiltrates, mainly in the CP and meninges. We also detected the presence of anti-Leishmania antibodies and albumin in the CSF, as well as Leishmania DNA in the CP. The gene expression of CCL-5 was increased in the CP of infected dogs compared with that of controls, and there was a tendency for the increase in the gene expression of CXCL-10. Thus, our findings confirm the disfunction of the BCSFB during CanL and suggest that the chemokines CCL-5 and CXCL-10 can be responsible for the recruitment of inflammatory cells found in CP.

8.
Vet Parasitol ; 320: 109958, 2023 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-37269731

RESUMO

Leishmania infantum causes visceral leishmaniosis, a neglected tropical disease that can modulate the host immune response by altering the expression of small non-coding RNAs called microRNAs (miRNAs). Some miRNAs are differentially expressed in peripheral blood mononuclear cells (PBMCs) of dogs with canine visceral leishmaniosis (CanL), like the down-regulated miR-150. Even though miR-150 is negatively correlated with L. infantum parasitic load, it is unclear if miR-150 directly affects L. infantum parasitic load and (if so) how this miRNA would contribute to infection. Here, we isolated PBMCs from 14 naturally infected dogs (CanL group) and six healthy dogs (Control group) and treated them in vitro with miR-150 mimic or inhibitor. We measured L. infantum parasitic load using qPCR and compared treatments. We also measured miR-150 in silico predicted target protein levels (STAT1, TNF-α, HDAC8, and GZMB) using flow cytometry or enzyme-linked immunosorbent assays. Increasing miR-150 activity diminished L. infantum parasitic load in CanL PBMCs. We also found that inhibition of miR-150 reduced GZMB (granzyme B) levels. These findings demonstrate that miR-150 plays an important role in L. infantum infection in canine PBMCs, and they merit further studies aiming at drug development.


Assuntos
Doenças do Cão , Leishmania infantum , Leishmaniose Visceral , MicroRNAs , Animais , Cães , Leucócitos Mononucleares , Granzimas , Leishmaniose Visceral/parasitologia , Leishmaniose Visceral/veterinária , MicroRNAs/genética , Doenças do Cão/parasitologia
9.
Trop Med Infect Dis ; 8(6)2023 Jun 16.
Artigo em Inglês | MEDLINE | ID: mdl-37368741

RESUMO

(1) Background: To evaluate the epidemiological profile of people who use drugs at the PrEP outpatient clinic of the University Hospital of Brasília; (2) Methods: Cross-sectional study with a review of data from medical records referring to the first medical consultation. The prevalence ratio was calculated using a Poisson regression model with robust variance; (3) Results: A total of 53% of subjects reported drug use in the last 3 months. The unadjusted prevalence ratio of drug use in trans women was PR: 9.0 (95%CI: 1.4-57.5). people who use drugs have a 1.9 times higher prevalence of STI diagnosis, and a 2.4 times higher prevalence of partners compared to non-users; (4) Conclusions: Substance use was associated with a higher STI prevalence ratio and number of sexual partners.

10.
Artigo em Inglês | MEDLINE | ID: mdl-37179767

RESUMO

Objective: Data are scarce regarding hospital infection control committees and compliance with infection prevention and control (IPC) recommendations in Brazil, a country of continental dimensions. We assessed the main characteristics of infection control committees (ICCs) on healthcare-associated infections (HAIs) in Brazilian hospitals. Methods: This cross-sectional study was conducted in ICCs of public and private hospitals distributed across all Brazilian regions. Data were collected directly from the ICC staff by completing an online questionnaire and during on-site visits through face-to-face interviews. Results: In total, 53 Brazilian hospitals were evaluated from October 2019 to December 2020. All hospitals had implemented the IPC core components in their programs. All centers had protocols for the prevention and control of ventilator-associated pneumonia as well as bloodstream, surgical site, and catheter-associated urinary tract infections. Most hospitals (80%) had no budget specifically allocated to the IPC program; 34% of the laundry staff had received specific IPC training; and only 7.5% of hospitals reported occupational infections in healthcare workers. Conclusions: In this sample, most ICCs complied with the minimum requirements for IPC programs. The main limitation regarding ICCs was the lack of financial support. The findings of this survey support the development of strategic plans to improve IPCs in Brazilian hospitals.

11.
Front Genet ; 14: 1106496, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37124626

RESUMO

Canine Visceral leishmaniasis (CanL) poses a severe public health threat in several countries. Disease progression depends on the degree of immune response suppression. MicroRNAs (miRs) modulate mRNA translation into proteins and regulate various cellular functions and pathways associated with immune responses. MiR-21 and miR-148a can alter the parasite load and M1 macrophages are the principal cells in dogs' leishmanicidal activity. A previous study found increased miR-21 and miR-148a in splenic leukocytes (SL) of dogs with CanL using microarray analysis and in silico analysis identified PTEN pathway targets. PTEN is involved in the immune regulation of macrophages. We measured PTEN and the production of reactive oxygen species (ROS) and nitric oxide (NO) before and after transfection SLs of dogs with CanL with mimic and inhibition of miR-21 and miR-148a. PTEN levels increased, NO and ROS decreased in SLs from dogs with CanL. Inhibition of miRNA-21 resulted in PTEN increase; in contrast, PTEN decreased after miR-148a inhibition. Nitrite (NO2) levels increased after transfection with miR-21 inhibitor but were decreased with miR-148a inhibitor. The increase in miR-21 promoted a reduction in ROS and NO levels, but miR-148a inhibition increased NO and reduced ROS. These findings suggest that miR-21 and miR-148a can participate in immune response in CanL, affecting PTEN, NO, and ROS levels.

12.
PLoS Negl Trop Dis ; 17(1): e0011039, 2023 01.
Artigo em Inglês | MEDLINE | ID: mdl-36719867

RESUMO

Canine leishmaniasis (CanL) is a severe public health threat. Infected animals mediate transmission of the Leishmania protozoan to humans via the sandfly's bite during a blood meal. CanL progression depends on the degree of suppression of the immune response, possibly associated with microRNAs (miR), which can modulate mRNA translation into proteins and (consequently) regulate cell function. Increased miR-148a in splenic leukocytes (SL) of dogs with CanL was observed in previous studies, and in silico analysis, identified possible pathways involved in immune response regulation that are affected by this miR. Therefore, we evaluated the involvement of miR-148a in the regulation of TNF-α, IL-6, IL-12, IL-1ß, iNOS, MHCII, CD80, CD3, T-bet, and GATA-3 transcription factors and their relationship with parasite load in SL of dogs with CanL. Splenic leukocytes obtained from healthy and diseased dogs were transfected with miR-148a mimic and inhibitor oligonucleotides. After 48 hours, expression levels of MHCII, CD80, iNOS, CD3, T-bet, and GATA-3 were evaluated by flow cytometry, and concentrations of TNF-α, IL-12, IL-6, and IL-1ß were measured in culture supernatants by capture enzyme-linked immunosorbent assays. Transfection of SL with miR-148a mimics decreased iNOS levels in cells and TNF-α, IL-6, and IL-12 in the supernatants of cultured SL from CanL dogs. Interestingly, transfection with miR-148a inhibitor decreased parasite load in SL cells. These results suggest a direct or not regulatory role of this miR in the immune response to Leishmania infantum infection. We conclude that miR-148a can modulate immune responses by regulating inflammatory cytokines during CanL. Our results contribute to understanding the complex host/parasite interaction in CanL and could assist the development of treatments.


Assuntos
Doenças do Cão , Leishmania infantum , Leishmaniose Visceral , Leishmaniose , MicroRNAs , Animais , Cães , Citocinas , Doenças do Cão/parasitologia , Interleucina-12/genética , Interleucina-6 , Leishmania infantum/genética , Leishmaniose/veterinária , Leishmaniose Visceral/parasitologia , MicroRNAs/genética , Carga Parasitária , Fator de Necrose Tumoral alfa/genética
13.
Tomazini, Bruno M; Nassar Jr, Antonio Paulo; Lisboa, Thiago Costa; Azevedo, Luciano César Pontes de; Veiga, Viviane Cordeiro; Catarino, Daniela Ghidetti Mangas; Fogazzi, Debora Vacaro; Arns, Beatriz; Piastrelli, Filipe Teixeira; Dietrich, Camila; Negrelli, Karina Leal; Jesuíno, Isabella de Andrade; Reis, Luiz Fernando Lima; Mattos, Renata Rodrigues de; Pinheiro, Carla Cristina Gomes; Luz, Mariane Nascimento; Spadoni, Clayse Carla da Silva; Moro, Elisângela Emilene; Bueno, Flávia Regina; Sampaio, Camila Santana Justo Cintra; Silva, Débora Patrício; Baldassare, Franca Pellison; Silva, Ana Cecilia Alcantara; Veiga, Thabata; Barbante, Leticia; Lambauer, Marianne; Campos, Viviane Bezerra; Santos, Elton; Santos, Renato Hideo Nakawaga; Laranjeiras, Ligia Nasi; Valeis, Nanci; Santucci, Eliana; Miranda, Tamiris Abait; Patrocínio, Ana Cristina Lagoeiro do; Carvalho, Andréa de; Sousa, Eduvirgens Maria Couto de; Sousa, Ancelmo Honorato Ferraz de; Malheiro, Daniel Tavares; Bezerra, Isabella Lott; Rodrigues, Mirian Batista; Malicia, Julliana Chicuta; Silva, Sabrina Souza da; Gimenes, Bruna dos Passos; Sesin, Guilhermo Prates; Zavascki, Alexandre Prehn; Sganzerla, Daniel; Medeiros, Gregory Saraiva; Santos, Rosa da Rosa Minho dos; Silva, Fernanda Kelly Romeiro; Cheno, Maysa Yukari; Abrahão, Carolinne Ferreira; Oliveira Junior, Haliton Alves de; Rocha, Leonardo Lima; Nunes Neto, Pedro Aniceto; Pereira, Valéria Chagas; Paciência, Luis Eduardo Miranda; Bueno, Elaine Silva; Caser, Eliana Bernadete; Ribeiro, Larissa Zuqui; Fernandes, Caio Cesar Ferreira; Garcia, Juliana Mazzei; Silva, Vanildes de Fátima Fernandes; Santos, Alisson Junior dos; Machado, Flávia Ribeiro; Souza, Maria Aparecida de; Ferronato, Bianca Ramos; Urbano, Hugo Corrêa de Andrade; Moreira, Danielle Conceição Aparecida; Souza-Dantas, Vicente Cés de; Duarte, Diego Meireles; Coelho, Juliana; Figueiredo, Rodrigo Cruvinel; Foreque, Fernanda; Romano, Thiago Gomes; Cubos, Daniel; Spirale, Vladimir Miguel; Nogueira, Roberta Schiavon; Maia, Israel Silva; Zandonai, Cassio Luis; Lovato, Wilson José; Cerantola, Rodrigo Barbosa; Toledo, Tatiana Gozzi Pancev; Tomba, Pablo Oscar; Almeida, Joyce Ramos de; Sanches, Luciana Coelho; Pierini, Leticia; Cunha, Mariana; Sousa, Michelle Tereza; Azevedo, Bruna; Dal-Pizzol, Felipe; Damasio, Danusa de Castro; Bainy, Marina Peres; Beduhn, Dagoberta Alves Vieira; Jatobá, Joana DArc Vila Nova; Moura, Maria Tereza Farias de; Rego, Leila Rezegue de Moraes; Silva, Adria Vanessa da; Oliveira, Luana Pontes; Sodré Filho, Eliene Sá; Santos, Silvana Soares dos; Neves, Itallo de Lima; Leão, Vanessa Cristina de Aquino; Paes, João Lucidio Lobato; Silva, Marielle Cristina Mendes; Oliveira, Cláudio Dornas de; Santiago, Raquel Caldeira Brant; Paranhos, Jorge Luiz da Rocha; Wiermann, Iany Grinezia da Silva; Pedroso, Durval Ferreira Fonseca; Sawada, Priscilla Yoshiko; Prestes, Rejane Martins; Nascimento, Glícia Cardoso; Grion, Cintia Magalhães Carvalho; Carrilho, Claudia Maria Dantas de Maio; Dantas, Roberta Lacerda Almeida de Miranda; Silva, Eliane Pereira; Silva, Antônio Carlos da; Oliveira, Sheila Mara Bezerra de; Golin, Nicole Alberti; Tregnago, Rogerio; Lima, Valéria Paes; Silva, Kamilla Grasielle Nunes da; Boschi, Emerson; Buffon, Viviane; Machado, André SantAna; Capeletti, Leticia; Foernges, Rafael Botelho; Carvalho, Andréia Schubert de; Oliveira Junior, Lúcio Couto de; Oliveira, Daniela Cunha de; Silva, Everton Macêdo; Ribeiro, Julival; Pereira, Francielle Constantino; Salgado, Fernanda Borges; Deutschendorf, Caroline; Silva, Cristofer Farias da; Gobatto, Andre Luiz Nunes; Oliveira, Carolaine Bomfim de; Dracoulakis, Marianna Deway Andrade; Alvaia, Natália Oliveira Santos; Souza, Roberta Machado de; Araújo, Larissa Liz Cardoso de; Melo, Rodrigo Morel Vieira de; Passos, Luiz Carlos Santana; Vidal, Claudia Fernanda de Lacerda; Rodrigues, Fernanda Lopes de Albuquerque; Kurtz, Pedro; Shinotsuka, Cássia Righy; Tavares, Maria Brandão; Santana, Igor das Virgens; Gavinho, Luciana Macedo da Silva; Nascimento, Alaís Brito; Pereira, Adriano J; Cavalcanti, Alexandre Biasi.
Rev. bras. ter. intensiva ; 34(4): 418-425, out.-dez. 2022. tab, graf
Artigo em Português | LILACS-Express | LILACS | ID: biblio-1423667

RESUMO

RESUMO Objetivo: Descrever o IMPACTO-MR, um estudo brasileiro de plataforma nacional em unidades de terapia intensiva focado no impacto das infecções por bactérias multirresistentes relacionadas à assistência à saúde. Métodos: Descrevemos a plataforma IMPACTO-MR, seu desenvolvimento, critérios para seleção das unidades de terapia intensiva, caracterização da coleta de dados, objetivos e projetos de pesquisa futuros a serem realizados na plataforma. Resultados: Os dados principais foram coletados por meio do Epimed Monitor System® e consistiram em dados demográficos, dados de comorbidades, estado funcional, escores clínicos, diagnóstico de internação e diagnósticos secundários, dados laboratoriais, clínicos e microbiológicos e suporte de órgãos durante a internação na unidade de terapia intensiva, entre outros. De outubro de 2019 a dezembro de 2020, 33.983 pacientes de 51 unidades de terapia intensiva foram incluídos no banco de dados principal. Conclusão: A plataforma IMPACTO-MR é um banco de dados clínico brasileiro de unidades de terapia intensiva focado na pesquisa do impacto das infecções por bactérias multirresistentes relacionadas à assistência à saúde. Essa plataforma fornece dados para o desenvolvimento e pesquisa de unidades de terapia intensiva individuais e ensaios clínicos observacionais e prospectivos multicêntricos.


ABSTRACT Objective: To describe the IMPACTO-MR, a Brazilian nationwide intensive care unit platform study focused on the impact of health care-associated infections due to multidrug-resistant bacteria. Methods: We described the IMPACTO-MR platform, its development, criteria for intensive care unit selection, characterization of core data collection, objectives, and future research projects to be held within the platform. Results: The core data were collected using the Epimed Monitor System® and consisted of demographic data, comorbidity data, functional status, clinical scores, admission diagnosis and secondary diagnoses, laboratory, clinical, and microbiological data, and organ support during intensive care unit stay, among others. From October 2019 to December 2020, 33,983 patients from 51 intensive care units were included in the core database. Conclusion: The IMPACTO-MR platform is a nationwide Brazilian intensive care unit clinical database focused on researching the impact of health care-associated infections due to multidrug-resistant bacteria. This platform provides data for individual intensive care unit development and research and multicenter observational and prospective trials.

14.
Parasit Vectors ; 15(1): 320, 2022 Sep 08.
Artigo em Inglês | MEDLINE | ID: mdl-36076242

RESUMO

BACKGROUND: Polyarthritis has been associated with canine visceral leishmaniasis (CanVL), and co-infection with Ehrlichia canis is common and may alter clinical manifestations. METHODS: A total of 89 dogs presenting CanVL were subdivided into two groups: (1) G1, consisting of 46 dogs seronegative to Ehrlichia spp., and (ii) G2, consisting of 43 dogs seropositive to Ehrlichia spp. Eight joints (carpal, tarsal, stifles and elbows) from each dog were evaluated by radiography and synovial fluid (SF) cytologic analysis. RESULTS: Overall, 74 of the 89 (83.1%) dogs presented joint abnormalities suggestive of osteoarthritis by radiography (G1: 40/46 [86.9%]; G2: 34/43 [79.0%]), with no statistically significant between-group difference. All dogs with abnormal joint X-ray images presented radiographic lesions bilaterally, independent of the characteristics of the lesion. Soft tissue swelling around the joint and joint space narrowing were more commonly observed in G1 than in G2 dogs. There was no significant between-group difference in terms of other radiographic abnormalities suggestive of osteoarthritis (evident trabecular pattern, subchondral bone sclerosis, osteolysis, osteolytic-proliferative lesions or bone proliferation). SF from 174/315 (55.2%) and 152/307 (49.5%) joints from G1 and G2 dogs, respectively, presented an inflammatory infiltrate, but there was no significant association between the presence of inflammatory infiltrate and group. There was also no statistical difference between groups in either of the evaluated joints in terms of the percentage of neutrophils or mononuclear cells. Leishmania spp. amastigotes were found in 69/315 (21.9%) joints from G1 dogs and in 100/307 (32.5%) joints from G2 dogs (Fisher's exact test, P = 0.002, odds ratio = 0.5, 95% confidence interval = 0.4-0.8). The neutrophilic infiltrate was significantly higher in joints with amastigote forms in both G1 (Mann-Whitney U-test, U(18) = 817, Z = -3.76, P = 0.0001) and G2 dogs (Mann-Whitney U-test, U(18) = 6543, Z = - 5.06, P < 0.0001). CONCLUSIONS: A high prevalence of arthritis in dogs with CanVL was found, and all dogs presented involvement in multiple joints. Although no difference was observed between groups in terms of the number of dogs with polyarthritis and the presence of an inflammatory infiltrate in SF, Leishmania spp. amastigotes were found more frequently in joints from G2 dogs. Further studies evaluating SF in dogs co-infected with L. infantum and E. canis should be performed to evaluate this finding.


Assuntos
Doenças do Cão , Leishmania infantum , Leishmaniose Visceral , Osteoartrite , Animais , Doenças do Cão/epidemiologia , Cães , Leishmaniose Visceral/complicações , Leishmaniose Visceral/diagnóstico por imagem , Leishmaniose Visceral/veterinária , Osteoartrite/complicações , Osteoartrite/diagnóstico por imagem , Osteoartrite/veterinária , Líquido Sinovial
15.
PLoS One ; 17(3): e0265192, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35324917

RESUMO

Visceral leishmaniasis in humans is a chronic and fatal disease if left untreated. Canine leishmaniasis (CanL) is a severe public health problem because infected animals are powerful transmitters of the parasite to humans via phlebotomine vectors. Therefore, dogs are an essential target for control measures. Progression of canine infection is accompanied by failure of cellular immunity with reduction of circulating lymphocytes and increased cytokines that suppress macrophage function. Studies showed that the regulation of the effector function of macrophages and T cells appears to depend on miRNAs; miRNA-21 (miR-21) shows increased expression in splenic leukocytes of dogs with CanL and targets genes related to the immune response. Mimics and inhibitors of miR-21 were used in vitro to transfect splenic leukocytes from dogs with CanL. After transfection, expression levels of the proteins FAS, FASL, CD69, CCR7, TNF-α, IL-17, IFN-γ, and IL-10 were measured. FAS, FASL, CD69, and CCR7 expression levels decreased in splenic leukocytes from dogs with CanL. The miR-21 mimic decreased CD69 expression in splenic leukocytes from CanL and healthy groups. The miR-21 inhibitor decreased IL-10 levels in culture supernatants from splenic leukocytes in the CanL group. These findings suggest that miR-21 alters the immune response in CanL; therefore, miR-21 could be used as a possible therapeutic target for CanL.


Assuntos
Doenças do Cão , Leishmania infantum , Leishmaniose Visceral , Leishmaniose , MicroRNAs , Animais , Doenças do Cão/parasitologia , Cães , Interleucina-10/genética , Interleucina-10/uso terapêutico , Leishmaniose/veterinária , Leishmaniose Visceral/tratamento farmacológico , Leishmaniose Visceral/genética , Leishmaniose Visceral/veterinária , MicroRNAs/genética , MicroRNAs/uso terapêutico , Receptores CCR7
16.
Vet Res Commun ; 46(1): 109-120, 2022 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-34554364

RESUMO

The aim of this study was evaluating the association and correlation between the diagnostics tests used for Leishmania spp. detection in dogs and ticks. We evaluated 99 dogs and 990 Rhipicephalus sanguineus. In dogs, we used bone marrow aspirates and lymph node fine-needle aspiration biopsy (FNAB) for direct parasitological examinations and real time-polymerase chain reaction (RT-PCR) and collected blood samples for enzyme-linked immunosorbent assays (ELISA). In ticks, two laboratory techniques [immunohistochemistry to lipophosphoglycan (IHC) and RT-PCR] were performed in the intestine, ovaries and salivary glands. With respect to the measurement of diagnostic performance in dogs, lymph node RT-PCR proved to be the best test followed by ELISA and bone marrow RT-PCR. In ticks, intestine IHC were considered as a gold standard for diagnosis of leishmaniasis with intestinal RT-PCR being the best diagnostic test. To arrive at the correlation between laboratory techniques for dogs and their ticks, we evaluated the diagnostic test used for dogs with tests performed in R. sanguineus, which used lymph node FNAB as the gold standard. The intestine IHC technique showed strongest association. We demonstrated that the best tissue for Leishmania spp. detection in dogs was the lymph node and the intestine in case of ticks. As for laboratory techniques, the isolated analysis of each species presented a strong agreement between immunohistochemistry and RT-PCR when compared to its gold standard. In addition, we concluded that the immunohistochemistry of ticks' intestines was a better technique for diagnosing Leishmania spp. in R. sanguineus, thereby showing almost perfect correlation with the lymph node FNAB.


Assuntos
Doenças do Cão , Leishmania , Leishmaniose Visceral , Rhipicephalus sanguineus , Animais , Doenças do Cão/diagnóstico , Cães , Leishmaniose Visceral/diagnóstico , Leishmaniose Visceral/veterinária , Reação em Cadeia da Polimerase em Tempo Real/veterinária
17.
Plant Cell Environ ; 45(2): 296-311, 2022 02.
Artigo em Inglês | MEDLINE | ID: mdl-34800300

RESUMO

Recent results suggest that metabolism-mediated stomatal closure mechanisms are important to regulate differentially the stomatal speediness between ferns and angiosperms. However, evidence directly linking mesophyll metabolism and the slower stomatal conductance (gs ) in ferns is missing. Here, we investigated the effect of exogenous application of abscisic acid (ABA), sucrose and mannitol on stomatal kinetics and carried out a metabolic fingerprinting analysis of ferns and angiosperms leaves harvested throughout a diel course. Fern stomata did not respond to ABA in the time period analysed. No differences in the relative decrease in gs was observed between ferns and the angiosperm following provision of sucrose or mannitol. However, ferns have slower gs responses to these compounds than angiosperms. Metabolomics analysis highlights that ferns have a higher accumulation of secondary rather than primary metabolites throughout the diel course, with the opposite being observed in angiosperms. Our results indicate that metabolism-mediated stomatal closure mechanisms underpin the differential stomatal speediness regulation among ferns and angiosperms, in which the slower stomatal closure in ferns is associated with the lack of ABA-responsiveness, to a reduced capacity to respond to mesophyll-derived sucrose and to a higher carbon allocation toward secondary metabolism, which likely modulates both photosynthesis-gs and growth-stress tolerance trade-offs.


Assuntos
Ácido Abscísico/farmacologia , Gleiquênias/fisiologia , Magnoliopsida/fisiologia , Manitol/farmacologia , Reguladores de Crescimento de Plantas/farmacologia , Estômatos de Plantas/fisiologia , Sacarose/farmacologia , Gleiquênias/metabolismo , Cinética , Magnoliopsida/metabolismo
18.
Interface (Botucatu, Online) ; 26: e210737, 2022. ilus
Artigo em Português | LILACS | ID: biblio-1385936

RESUMO

Esta investigação teórica apresenta a abordagem dialógica de competência e seus princípios e métodos para a construção de perfis profissionais. De modo distinto às concepções que focalizam elementos isolados da competência, a abordagem dialógica está baseada em referencial integrador e propõe áreas de competência que caracterizam núcleo e campo no exercício profissional. Essa abordagem reconhece a existência de diferentes visões sobre competência profissional que devem ser analisadas e dialogadas. O perfil competente, construído como metapontos de vista, traduz combinações contextualizadas de conhecimentos, habilidades, atitudes e valores, que expressam excelência na atuação profissional, com vistas à formação, à certificação e à Educação Permanente de profissionais de saúde. O texto analisa a coerência entre as práticas assim sistematizadas e a elaboração de atividades profissionais confiáveis.(AU)


Esta investigación teórica presenta el abordaje dialógico de competencia, sus principios y métodos para la construcción de perfiles profesionales. De forma diferente a las concepciones que focalizan elementos aislados de la competencia, el abordaje dialógico se basa en un referencial integrador y propone áreas de competencia que caracterizan núcleo y campo en el ejercicio profesional. Ese abordaje reconoce la existencia de diferentes visiones sobre competencia profesional que deben analizarse y dialogarse. El perfil competente, construido como metapuntos de vista, traduce combinaciones contextualizadas de conocimientos, habilidades, actitudes y valores que expresan excelencia en la actuación profesional, con el objetivo de formación, certificación y educación permanentes de profesionales de la salud. El texto analiza la coherencia entre las prácticas sistematizadas de tal forma y la elaboración de actividades profesionales confiables.(AU)


This theoretical investigation presents the dialogic approach to competence, its principles, and methods for the construction of professional profiles. Unlike conceptions that focus on isolated elements of competence, the dialogic approach is based on an integrative framework and proposes areas of competence that characterize core and field in professional practice. This approach recognizes the existence of different views on professional competence that must be analyzed and discussed. A set of strategies, devices, and methods capable of triangulating these views and systematizing professional activities is presented. The competent profile, built as a meta point of view, translates contextualized combinations of knowledge, skills, attitudes, and values that express excellence in professional performance, with a view to training, certification, and continuing education of health professionals. The text analyzes the coherence between practices systematized in the way proposed here and the development of entrustable professional activities.(AU)


Assuntos
Humanos , Competência Profissional , Pessoal de Saúde , Educação Baseada em Competências , Prática Profissional/tendências
19.
Rev. bras. educ. méd ; 46(2): e058, 2022. tab, graf
Artigo em Português | LILACS-Express | LILACS | ID: biblio-1365627

RESUMO

Resumo: Introdução: A educação médica no Brasil atravessa um momento de grande transformação que requer adaptações e novos modelos de ensino. Diante da velocidade com que novas informações na área da saúde são produzidas, a incorporação das tecnologias digitais na prática educacional torna-se imprescindível, possibilitando a interação virtual e o acesso às bases de dados remotas. A associação entre as tecnologias digitais e as metodologias ativas, que promovem a autonomia dos estudantes e o desenvolvimento do pensamento crítico-reflexivo, implica novos desafios no contexto da educação em tempos de pandemia. Este ensaio analisa o uso de tecnologias digitais na educação médica e de saúde, destacando sua associação com as principais formas de metodologias ativas e os desafios da educação por acesso remoto, no contexto da pandemia da Covid-19. Desenvolvimento: Devido às medidas de distanciamento físico e de interrupção de atividades educacionais presenciais, as instituições de ensino vivenciaram mudanças drásticas com a necessidade de rápida adaptação na tentativa de atenuar os impactos da pandemia no ensino. O uso de ferramentas digitais como plataformas virtuais e o acesso remoto (síncronos e assíncronos) foram algumas das estratégias amplamente utilizadas. O levantamento de potenciais desafios na associação entre metodologias ativas e ensino remoto foi tratado de modo a problematizar o processo educacional em tempos de pandemia. Conclusão: A pandemia da Covid-19 evidenciou a necessidade de inovação nos métodos de ensino-aprendizagem e acelerou a utilização das tecnologias digitais e a adaptação a elas. A associação dessas tecnologias com metodologias ativas tornou-se um novo desafio para docentes e estudantes, e requer estudos adicionais sobre eficácia e implicações do ensino remoto na formação de futuros profissionais da saúde.


Abstract: Introduction: Medical education in Brazil is going through a time of great transformation that requires adaptations and new teaching models. Given the speed with which new information in the health area is produced, the incorporation of digital technologies in educational practice becomes essential, enabling virtual interaction and access to remote databases. The association between digital technologies and active methodologies, which promote student autonomy and the development of critical-reflective thinking, entails new challenges in education. This essay analyzes the use of digital technologies in medical and health education, highlighting their association with the main forms of active methodologies and the challenges of remote education, in the context of the Covid-19 pandemic. Development: Due to social distancing measures and the interruption of in-person educational activities, educational institutions have experienced drastic changes with the need for rapid adaptation to mitigate the impacts of the pandemic on education. The use of digital tools such as virtual platforms and remote access (synchronous and asynchronous) were widely used strategies. Potential challenges in the association between active methodologies and remote learning were investigated to problematize the educational process during the pandemic. Conclusion: The Covid-19 pandemic highlighted the need for innovation in teaching-learning methods and accelerated the use and adaptation to digital technologies. The association of these technologies with active methodologies has become a new challenge for teachers and students and further studies are required on the effectiveness and implications of remote learning for the training of future health professionals.

SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA