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T. Cruzi

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https://www.readbyqxmd.com/read/28103294/community-based-entomological-surveillance-reveals-urban-foci-of-chagas-disease-vectors-in-sobral-state-of-cear%C3%A3-northeastern-brazil
#1
Cynara Carvalho Parente, Fernando S M Bezerra, Plutarco I Parente, Raimundo V Dias-Neto, Samanta C C Xavier, Alberto N Ramos, Filipe A Carvalho-Costa, Marli M Lima
BACKGROUND: The aim of this work was to explore the potential risk of vector-borne Chagas disease in urban districts in northeastern Brazil, by analyzing the spatiotemporal distributions and natural infection rates with Trypanosoma cruzi of triatomine species captured in recent years. The main motivation of this work was an acute human case of Chagas disease reported in 2008 in the municipality of Sobral. METHODOLOGY/PRINCIPAL FINDINGS: We analyzed data from community-based entomological surveillance carried out from 2010 to 2014...
2017: PloS One
https://www.readbyqxmd.com/read/28095511/epidemiology-and-molecular-typing-of-trypanosoma-cruzi-in-naturally-infected-hound-dogs-and-associated-triatomine-vectors-in-texas-usa
#2
Rachel Curtis-Robles, Karen F Snowden, Brandon Dominguez, Lewis Dinges, Sandy Rodgers, Glennon Mays, Sarah A Hamer
BACKGROUND: Trypanosoma cruzi is the etiologic agent of Chagas disease throughout the Americas. Few population-level studies have examined the epidemiology of canine infection and strain types of T. cruzi that infect canines in the USA. We conducted a cross-sectional study of T. cruzi infection in working hound dogs in south central Texas, including analysis of triatomine vectors collected within kennel environments. METHODOLOGY/PRINCIPLE FINDINGS: Paired IFA and Chagas Stat-Pak serological testing showed an overall seroprevalence of 57...
January 17, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28095503/detection-of-a-potential-new-bartonella-species-candidatus-bartonella-rondoniensis-in-human-biting-kissing-bugs-reduviidae-triatominae
#3
Maureen Laroche, Jean-Michel Berenger, Oleg Mediannikov, Didier Raoult, Philippe Parola
BACKGROUND: Among the Reduviidae family, triatomines are giant blood-sucking bugs. They are well known in Central and South America where they transmit Trypanosoma cruzi to mammals, including humans, through their feces. This parasitic protozoan is the causative agent of Chagas disease, a major public health issue in endemic areas. Because of the medical and economic impact of Chagas disease, the presence of other arthropod-borne pathogens in triatomines was rarely investigated. METHODOLOGY/PRINCIPAL FINDINGS: In this study, seven triatomines species involved in the transmission of T...
January 17, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28095298/molecular-identification-and-genotyping-of-trypanosoma-cruzi-dna-in-autochthonous-chagas-disease-patients-from-texas-usa
#4
Melissa N Garcia, Hadley Burroughs, Rodion Gorchakov, Sarah M Gunter, Eric Dumonteil, Kristy O Murray, Claudia P Herrera
The parasitic protozoan Trypanosoma cruzi, the causative agent of Chagas disease, is widely distributed throughout the Americas, from the southern United States (US) to northern Argentina, and infects at least 6 million people in endemic areas. Much remains unknown about the dynamics of T. cruzi transmission among mammals and triatomine vectors in sylvatic and peridomestic eco-epidemiological cycles, as well as of the risk of transmission to humans in the US. Identification of T. cruzi DTUs among locally-acquired cases is necessary for enhancing our diagnostic and clinical prognostic capacities, as well as to understand parasite transmission cycles...
January 14, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28091763/the-prevalence-of-trypanosoma-cruzi-the-causal-agent-of-chagas-disease-in-texas-rodent-populations
#5
Adriana Aleman, Trina Guerra, Troy J Maikis, Matthew T Milholland, Ivan Castro-Arellano, Michael R J Forstner, Dittmar Hahn
Rodent species were assessed as potential hosts of Trypanosoma cruzi, the etiologic agent of Chagas disease, from five sites throughout Texas in sylvan and disturbed habitats. A total of 592 rodents were captured, resulting in a wide taxonomic representation of 11 genera and 15 species. Heart samples of 543 individuals were successfully analyzed by SybrGreen-based quantitative PCR (qPCR) targeting a 166 bp fragment of satellite DNA of T. cruzi. Eight rodents representing six species from six genera and two families were infected with T...
January 13, 2017: EcoHealth
https://www.readbyqxmd.com/read/28077696/a-new-development-in-trypanosoma-cruzi-diagnosis
#6
Herbert B Tanowitz, Louis M Weiss
Chagas disease caused by the parasite, Trypanosoma cruzi is an important cause of morbidity and mortality in endemic areas of Latin America and among infected individuals who have migrated to non-endemic areas of North America and Europe. There are many diagnostic tests that are employed in the serological diagnosis of this infection. In this issue of the J Clin Microbiol 55: XXX-XXX http://dx.doi:10.1128/JCM.01649-16 by Bautista-López et al provide characterization of excretory vesicles (EV) from Vero cells infected with T...
January 11, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28077180/understanding-transmissibility-patterns-of-chagas-disease-through-complex-vector-host-networks
#7
Laura Rengifo-Correa, Christopher R Stephens, Juan J Morrone, Juan Luis Téllez-Rendón, Constantino González-Salazar
Chagas disease is one of the most important vector-borne zoonotic diseases in Latin America. Control strategies could be improved if transmissibility patterns of its aetiologic agent, Trypanosoma cruzi, were better understood. To understand transmissibility patterns of Chagas disease in Mexico, we inferred potential vectors and hosts of T. cruzi from geographic distributions of nine species of Triatominae and 396 wild mammal species, respectively. The most probable vectors and hosts of T. cruzi were represented in a Complex Inference Network, from which we formulated a predictive model and several associated hypotheses about the ecological epidemiology of Chagas disease...
January 12, 2017: Parasitology
https://www.readbyqxmd.com/read/28076955/post-translational-modifications-of-trypanosoma-cruzi-canonical-and-variant-histones
#8
Gisele F A Picchi, Vanessa Zulkievicz, Marco Aurelio Krieger, Nilson T Zanchin, Samuel Goldenberg, Lyris M F de Godoy
Chagas disease, caused by Trypanosoma cruzi, still affects millions of people around the world. No vaccines neither treatment for chronic Chagas disease are available, and chemotherapy for the acute phase is hindered by limited efficacy and severe side effects. The processes by which the parasite acquires infectivity and survives in different hosts involve tight regulation of gene expression, mainly post-transcriptionally. Nevertheless, chromatin structure/organization of trypanosomatids is similar to other eukaryotes, including histone variants and post-translational modifications...
January 11, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28064141/methoxylated-2-hydroxychalcones-as-antiparasitic-hit-compounds
#9
Chiara Borsari, Nuno Santarem, Juan Torrado, Ana Isabel Olías, María Jesús Corral, Catarina Baptista, Sheraz Gul, Markus Wolf, Maria Kuzikov, Bernhard Ellinger, Gesa Witt, Philip Gribbon, Jeanette Reinshagen, Pasquale Linciano, Annalisa Tait, Luca Costantino, Lucio H Freitas-Junior, Carolina B Moraes, Pascoalino Bruno Dos Santos, Laura Maria Alcântara, Caio Haddad Franco, Claudia Danielli Bertolacini, Vanessa Fontana, Paloma Tejera Nevado, Joachim Clos, José María Alunda, Anabela Cordeiro-da-Silva, Stefania Ferrari, Maria Paola Costi
Chalcones display a broad spectrum of pharmacological activities. Herein, a series of 2'-hydroxy methoxylated chalcones was synthesized and evaluated towards Trypanosoma brucei, Trypanosoma cruzi and Leishmania infantum. Among the synthesized library, compounds 1, 3, 4, 7 and 8 were the most potent and selective anti-T. brucei compounds (EC50 = 1.3-4.2 μM, selectivity index >10-fold). Compound 4 showed the best early-tox and antiparasitic profile. The pharmacokinetic studies of compound 4 in BALB/c mice using hydroxypropil-β-cyclodextrins formulation showed a 7...
December 9, 2016: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28062234/in-vitro-antiprotozoal-activity-of-s-cis-verbenol-against-leishmania-spp-and-trypanosoma-cruzi
#10
Gloria Yaluff, Celeste Vega, Nelson Alvarenga
(S)-cis-Verbenol, a monoterpene frequently found as a component of essential oils, was assayed against Leishmania amazonensis, Leishmania infantum, Leishmania brasiliensis and against two strains of Trypanosoma cruzi. The cytotoxicity of the compound was also assayed against human fibroblast cells using a colorimetric method. Benznidazole was used as reference drug against T. cruzi and amphotericin B was used against Leishmania spp. The compound showed good activity against the trypanosomes, being more active against the CL Brenner strain, with an IC50 value of 8...
January 3, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28054995/antiparasitic-activity-of-sulfur-and-fluorine-containing-bisphosphonates-against-trypanosomatids-and-apicomplexan-parasites
#11
Tamila Galaka, Mariana Ferrer Casal, Melissa Storey, Catherine Li, María N Chao, Sergio H Szajnman, Roberto Docampo, Silvia N J Moreno, Juan B Rodriguez
Based on crystallographic data of the complexes 2-alkyl(amino)ethyl-1,1-bisphosphonates-Trypanosoma cruzi farnesyl diphosphate synthase, some linear 1,1-bisphosphonic acids and other closely related derivatives were designed, synthesized and biologically evaluated against T. cruzi, the responsible agent of Chagas disease and against Toxoplasma gondii, the etiologic agent of toxoplasmosis and also towards the target enzymes farnesyl pyrophosphate synthase of T. cruzi (TcFPPS) and T gondii (TgFPPS), respectively...
January 4, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28040568/in%C3%A2-vitro-drug-susceptibility-of-two-strains-of-the-wildlife-trypanosome-trypanosoma-copemani-a-comparison-with-trypanosoma-cruzi
#12
Adriana Botero, Sarah Keatley, Christopher Peacock, R C Andrew Thompson
Trypanosomes are blood protozoan parasites that are capable of producing illness in the vertebrate host. Within Australia, several native Trypanosoma species have been described infecting wildlife. However, only Trypanosoma copemani has been associated with pathological lesions in wildlife hosts and more recently has been associated with the drastic decline of the critically endangered woylie (Bettongia penicillata). The impact that some trypanosomes have on the health of the vertebrate host has led to the development of numerous drug compounds that could inhibit the growth or kill the parasite...
December 23, 2016: International Journal for Parasitology, Drugs and Drug Resistance
https://www.readbyqxmd.com/read/28038431/comparative-effects-of-histone-deacetylases-inhibitors-and-resveratrol-on-trypanosoma-cruzi-replication-differentiation-infectivity-and-gene-expression
#13
Vanina A Campo
Histone post-translational modification, mediated by histone acetyltransferases and deacetylases, is one of the most studied factors affecting gene expression. Recent data showing differential histone acetylation states during the Trypanosoma cruzi cell cycle suggest a role for epigenetics in the control of this process. As a starting point to study the role of histone deacetylases in the control of gene expression and the consequences of their inhibition and activation in the biology of T. cruzi, two inhibitors for different histone deacetylases: trichostatin A for class I/II and sirtinol for class III and the activator resveratrol for class III, were tested on proliferative and infective forms of this parasite...
December 21, 2016: International Journal for Parasitology, Drugs and Drug Resistance
https://www.readbyqxmd.com/read/28029081/drug-discovery-for-paediatric-chagas-diseases
#14
Sreekanth Thota, Carlos M Morel
Congenital T. cruzi infection occurs in 1-10% of infants of infected mothers. Treatment of Chagas disease focuses on killing the parasite in acute infection and managing signs and symptoms in later stages. Mothers who test positive should not be treated until they have given birth and have finished breast-feeding. Screening of newborns and other children of infected mothers to provide early diagnosis and treatment. There are only two drugs currently available for the treatment of paediatric chagas disease, nifurtimox and benznidazole...
December 26, 2016: Mini Reviews in Medicinal Chemistry
https://www.readbyqxmd.com/read/28025938/trypanothione-reductase-and-superoxide-dismutase-as-current-drug-targets-for-trypanosoma-cruzi-an-overview-of-compounds-with-activity-against-chagas-disease
#15
Iván Beltrán-Hortelano, Silvia Pérez-Silanes, Silvia Galiano
It has been over a century since Carlos Chagas discovered the Trypanosoma cruzi (T. cruzi) as the causative agent of Chagas disease (CD), a neglected tropical disease with several socioeconomic, epidemiological and human health repercussions. Currently, there are only two commercialized drugs to treat CD in acute phase, nifurtimox and benznidazol, with several adverse side effects. Thus, new orally available and safe drugs for this parasitic infection are urgently required. One strategy of great importance in new drug discovery programmes is based on the search of molecules enabling to interfere with enzymes involved in T...
December 26, 2016: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28013375/alterations-in-pancreatic-%C3%AE-cell-function-and-trypanosoma-cruzi-infection-evidence-from-human-and-animal-studies
#16
REVIEW
Quinn Dufurrena, Farhad M Amjad, Philipp E Scherer, Louis M Weiss, Jyothi Nagajyothi, Jesse Roth, Herbert B Tanowitz, Regina Kuliawat
The parasite Trypanosoma cruzi causes a persistent infection, Chagas disease, affecting millions of persons in endemic areas of Latin America. As a result of immigration, this disease has now been diagnosed in non-endemic areas worldwide. Although, the heart and gastrointestinal tract are the most studied, the insulin-secreting β cell of the endocrine pancreas is also a target of infection. In this review, we summarize available clinical and laboratory evidence to determine whether T. cruzi-infection-mediated changes of β cell function is likely to contribute to the development of hyperglycemia and diabetes...
December 24, 2016: Parasitology Research
https://www.readbyqxmd.com/read/28011170/antiprotozoal-drug-nitazoxanide-enhances-parasitemia-tissue-lesions-and-mortality-caused-by-trypanosoma-cruzi-in-murine-model
#17
Juan Salvador Valle-Reyes, Valery Melnikov, Oxana Dobrovinskaya, Alejandrina Rodriguez-Hernández, Cristina Wookee-Zea, Víctor Pimientel-Rodrigez, Gabriela Rueda-Valdovinos, Iván Delgado-Enciso, Uriel A López-Lemus, Francisco Espinoza-Gómez
Chagas' disease is caused by unicellular parasite Trypanosoma cruzi (T. cruzi). It is endemic throughout Latin America, but nowadays has become a global challenge due to tourism and migration. Non-treated infection may result in health-threatening complications and lead to death. Current medications for this infection are nifurtimox (NFT) and benznidazol. Both drugs may cause side effects and are ineffective in the chronic phase. Therefore, new antichagasic compounds are urgently required. Nitazoxanide (NTZ) is a broad spectrum antiparasitic drug, proposed recently as a potential candidate to be added to the list of essential medicines for integrated neglected tropical disease control and elimination...
December 21, 2016: Experimental Parasitology
https://www.readbyqxmd.com/read/28007406/adipose-tissue-a-safe-haven-for-parasites
#18
REVIEW
Herbert B Tanowitz, Philipp E Scherer, Maria M Mota, Luisa M Figueiredo
Adipose tissue (AT) is no longer regarded as an inert lipid storage, but as an important central regulator in energy homeostasis and immunity. Three parasite species are uniquely associated with AT during part of their life cycle: Trypanosoma cruzi, the causative agent of Chagas disease; Trypanosoma brucei, the causative agent of African sleeping sickness; and Plasmodium spp., the causative agents of malaria. In AT, T. cruzi resides inside adipocytes, T. brucei is found in the interstitial spaces between adipocytes, while Plasmodium spp...
December 19, 2016: Trends in Parasitology
https://www.readbyqxmd.com/read/28003350/blood-gene-signatures-of-chagas-disease-cardiomyopathy-with-or-without-ventricular-dysfunction
#19
Ludmila Rodrigues Pinto Ferreira, Frederico Moraes Ferreira, Helder Imoto Nakaya, Xutao Deng, Darlan da Silva Cândido, Lea Campos de Oliveira, Jean-Noel Billaud, Marion C Lanteri, Vagner Oliveira-Carvalho Rigaud, Mark Seielstad, Jorge Kalil, Fabio Fernandes, Antônio Luiz P Ribeiro, Ester Cerdeira Sabino, Edecio Cunha-Neto
Chagas disease, caused by the protozoan parasite Trypanosoma cruzi, affects 7 million people in endemic Latin America. About 30% of infected patients will develop chronic Chagas disease cardiomyopathy (CCC), an inflammatory cardiomyopathy characterized by hypertrophy, fibrosis and myocarditis. Further studies are necessary to understand the molecular mechanisms of disease progression. Transcriptome analysis has been increasingly used to identify molecular changes associated with disease outcomes. We thus assessed the whole-blood transcriptome of Chagas disease patients...
December 21, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28002786/plasma-concentrations-of-ccl3-and-ccl4-in-the-cardiac-and-digestive-clinical-forms-of-chronic-chagas-disease
#20
Amanda Priscila de Oliveira, Christiane Maria Ayo, Kallyne Kioko Oliveira Mimura, Sonia Maria Oliani, Cássia Rubia Bernardo, Ana Vitória Silveira Camargo, Luís Sérgio Ronchi, Aldenis Albaneze Borim, Eumildo de Campos Júnior, Cinara Cássia Brandão de Mattos, Lilian Castiglioni, Reinaldo Bulgarelli Bestetti, Carlos Eugênio Cavasini, Luiz Carlos de Mattos
The aim of this study was to investigate the plasma levels of the CCL3 and CCL4 chemokines in patients with the cardiac and digestive clinical forms of chronic Chagas disease and in cardiac patients with and without left ventricular systolic dysfunction (LVSD). Plasma samples from 75 patients were evaluated by enzyme-linked immunosorbent assay (ELISA) to confirm infection by T. cruzi. Plasma levels of the CCL3 and CCL4 chemokines were measured using Milliplex® MAP assay (Millipore). There were no significant differences in the levels of CCL3 and CCL4 between patients with the digestive and cardiac clinical forms of Chagas disease...
December 18, 2016: Cytokine
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