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https://www.readbyqxmd.com/read/29643755/-alpinia-essential-oils-and-their-major-components-against-rhodnius-nasutus-a-vector-of-chagas-disease
#1
Thamiris de A de Souza, Marcio B P Lopes, Aline de S Ramos, José Luiz P Ferreira, Jefferson Rocha de A Silva, Margareth M C Queiroz, Kátia G de Lima Araújo, Ana Claudia F Amaral
Species of the genus Alpinia are widely used by the population and have many described biological activities, including activity against insects. In this paper, we describe the bioactivity of the essential oil of two species of Alpinia genus, A. zerumbet and A. vittata , against Rhodnius nasutus , a vector of Chagas disease. The essential oils of these two species were obtained by hydrodistillation and analyzed by GC-MS. The main constituent of A. zerumbet essential oil (OLALPZER) was terpinen-4-ol, which represented 19...
2018: TheScientificWorldJournal
https://www.readbyqxmd.com/read/29626223/effect-of-temperature-and-vector-nutrition-on-the-development-and-multiplication-of-trypanosoma-rangeli-in-rhodnius-prolixus
#2
Roberta Carvalho Ferreira, Cínthia Firmo Teixeira, Vinícius Fernandes A de Sousa, Alessandra A Guarneri
Trypanosoma rangeli is a protozoan parasite that infects mammals and triatomines, causing different levels of pathogenicity in its invertebrate vectors, particularly those from the genus Rhodnius. We have recently shown that temperature can modulate T. rangeli growth during in vitro culture, as well as its in vivo pathogenicity to R. prolixus. In the present study, we investigated colonization of R. prolixus by T. rangeli and assessed the role of temperature and vector nutrition on parasite development and multiplication...
April 6, 2018: Parasitology Research
https://www.readbyqxmd.com/read/29456553/silencing-of-iron-and-heme-related-genes-revealed-a-paramount-role-of-iron-in-the-physiology-of-the-hematophagous-vector-rhodnius-prolixus
#3
Ana B Walter-Nuno, Mabel L Taracena, Rafael D Mesquita, Pedro L Oliveira, Gabriela O Paiva-Silva
Iron is an essential element for most organisms However, free iron and heme, its complex with protoporphyrin IX, can be extremely cytotoxic, due to the production of reactive oxygen species, eventually leading to oxidative stress. Thus, eukaryotic cells control iron availability by regulating its transport, storage and excretion as well as the biosynthesis and degradation of heme. In the genome of Rhodnius prolixus , the vector of Chagas disease, we identified 36 genes related to iron and heme metabolism We performed a comprehensive analysis of these genes, including identification of homologous genes described in other insect genomes...
2018: Frontiers in Genetics
https://www.readbyqxmd.com/read/29447846/keeping-cool-kissing-bugs-avoid-cannibalism-by-thermoregulating
#4
Claudio R Lazzari, Aurélie Fauquet, Chloé Lahondère
Kissing bugs possess a highly developed thermal sense and when starved, they attempt to bite any object which temperature is close to that of a warm-blooded host. At each feeding event, these insects take massive meals in just a few minutes. One could then expect fed-bugs being heated-up by the ingested warm blood and so becoming attractive to starved conspecifics. This is not however the case, arising the question about why cannibalism is very rare among these insects. Recently, the ability of thermoregulating during feeding has been demonstrated in Rhodnius prolixus...
February 12, 2018: Journal of Insect Physiology
https://www.readbyqxmd.com/read/29425363/trypanosoma-cruzi-infection-in-rhodnius-pallescens-heteroptera-reduviidae-infesting-coyol-palms-in-the-dry-arch-of-panam%C3%A3
#5
Indra G Rodríguez, Azael Saldaña, Kadir González, Vanessa Pineda, Milixa Perea, Ana M Santamaría, Carmen C de Junca, Luis F Chaves, José E Calzada
Ecoepidemiological scenarios for Trypanosoma cruzi Chagas transmission are partially shaped by kissing bug vector ecology. The presence of Attalea butyracea Kunth, the 'royal palm', is a major risk factor for Chagas disease transmission in Panamá given their frequent infestations by Rhodnius pallescens Barber, a major neotropical T. cruzi vector. It was assumed that in Panamá this relationship was very close and unique, limiting the niche of R. pallescens to that of Att. butyracea. However, here we present observations about T...
February 7, 2018: Journal of Medical Entomology
https://www.readbyqxmd.com/read/29378264/molecular-characterization-of-rhodnius-robustus-specimens-potential-vectors-for-chagas-disease-in-french-guiana-south-america
#6
Christian Barnabé, Simone Frédérique Brenière, Jean-François Guégan, Denis Blanchet, Christine Aznar
Insects of the genus Rhodnius are broadly involved in Chagas disease transmission. In French Guiana, where the disease remains a public health problem, R. robustus and R. pictipes are vectors, but so far few genetic analyses of these local species have been reported. Here, we explored three mitochondrial genes (Cytb, Lsu-rRNA, and ND1) and one nuclear gene (D2) in 49 adult specimens morphologically characterized as R. robustus. We analyzed genetic polymorphisms and haplotype distributions, and we built phylogenetic trees using the available GenBank sequences from R...
January 26, 2018: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/29363459/cdna-isolation-and-expression-of-nicotinamide-adenine-dinucleotide-phosphate-dependent-cytochrome-p450-reductase-gene-in-the-chagas-disease-vector-triatoma-infestans
#7
Carla G Grosso, María M Stroppa, Gonzalo M Varela, Beatriz A García
Pyrethroid resistance has been detected in Triatoma infestans (Hemiptera: Reduviidae), which was atributed to target site insensitivity and increased oxidative metabolism of the insecticide by cytochrome P450s. Nicotinamide adenine dinucleotide phosphate (NADPH) cytochrome P450 reductase (CPR) plays an essential role in transferring electrons from NADPH to the P450-substrate complex. In this study, the full length CPR cDNA of T. infestans was isolated and gene expression was determined by quantitative polymerase chain reaction...
March 2018: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29357911/comparative-genomics-analysis-of-triatomines-reveals-common-first-line-and-inducible-immunity-related-genes-and-the-absence-of-imd-canonical-components-among-hemimetabolous-arthropods
#8
Federico Alonso Zumaya-Estrada, Jesús Martínez-Barnetche, Andrés Lavore, Rolando Rivera-Pomar, Mario Henry Rodríguez
BACKGROUND: Insects operate complex humoral and cellular immune strategies to fend against invading microorganisms. The majority of these have been characterized in Drosophila and other dipterans. Information on hemipterans, including Triatominae vectors of Chagas disease remains incomplete and fractionated. RESULTS: We identified putative immune-related homologs of three Triatominae vectors of Chagas disease, Triatoma pallidipennis, T. dimidiata and T. infestans (TTTs), using comparative transcriptomics based on established immune response gene references, in conjunction with the predicted proteomes of Rhodnius prolixus, Cimex lecticularis and Acyrthosiphon pisum hemimetabolous...
January 22, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29340462/rhodnius-stali-new-vector-infected-by-trypanosoma-rangeli-kinetoplastida-trypanosomatidae
#9
Gabriela Vieira de Souza Castro, Mariane Albuquerque Lima Ribeiro, Leandro José Ramos, Jader de Oliveira, João Aristeu da Rosa, Luis Marcelo Aranha Camargo, Dionatas Ulises de Oliveira Meneguetti
INTRODUCTION: Rhodnius stali infection by Trypanosoma rangeli is reported in this study for the first time. METHODS: The triatomines were collected from the campus of the Federal University of Acre in Rio Branco, Acre, Brazil. The identification of T. rangeli was confirmed by multiplex polymerase chain reaction. RESULTS: The examinations of two specimens revealed R. stali infection by the epimastigote forms of T. rangeli. CONCLUSIONS: The encounter of R...
November 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/29305891/efficacy-of-essential-oil-of-syzygium-aromaticum-alone-and-in-combination-with-benznidazole-on-murine-oral-infection-with-trypanosoma-cruzi-iv
#10
Gerson Zanusso Junior, Miyoko Massago, Danielle Kian, Max Jean de Ornelas Toledo
Chagas disease (CD), caused by Trypanosoma cruzi, remains a serious public health problem. One of the causes of the high morbidity and mortality in patients is the lack of an effective drug therapy. Thus, the aim of this study was to evaluate the efficacy of the essential oil of Syzygium aromaticum alone and in combination with benznidazole (BZ) in mice orally inoculated with strain of T. cruzi IV obtained from oral CD outbreak occurred in Western Brazilian Amazonia. All the animals inoculated with metacyclic trypomastigote forms (AM14 strain, BZ resistant), derived from the insect Rhodnius robustus, became infected and there was no difference in the mortality rate between the experimental groups...
February 2018: Experimental Parasitology
https://www.readbyqxmd.com/read/29260645/clock-gene-period-in-the-chagas-disease-vector-triatoma-infestans-hemiptera-reduviidae
#11
María M Stroppa, Ignacio Gimenez, Beatriz A García
To contribute to a better understanding of the molecular bases of the circadian biological rhythms in Chagas disease vectors, in this work we identified functional domains in the sequences of the clock protein PERIOD (PER) in Rhodnius prolixus and Triatoma infestans and analyzed the expression of the PER gene at mRNA level in T. infestans . The PER protein sequences comparison among these species and those from other insects revealed that the most similar regions are the PAS domains and the most variable is the COOH-terminal...
February 2018: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29211104/surveillance-of-seroepidemiology-and-morbidity-of-chagas-disease-in-the-negro-river-brazilian-amazon
#12
José Rodrigues Coura, Angela Cv Junqueira, João Marcos Bb Ferreira
BACKGROUND: Chagas disease in the Brazilian Amazon Region was previously regarded as an enzootic disease of wild animals. More recently, in situations where humans have penetrated the wild ecotope or where triatomines and/or wild animals (marsupials) have invaded human homes resulting in disease transmission, Chagas disease has come to be regarded as an anthropozoonosis. We found that the highest incidence of infection due to Trypanosoma cruzi and Chagas disease occurred among piassaba fibre gatherers and their families...
January 2018: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/29167493/functional-aspects-of-salivary-nitric-oxide-synthase-of-rhodnius-prolixus-hemiptera-reduviidae-and-nitric-oxide-trafficking-at-the-vector-host-interface
#13
Rafaela M M Paim, Bruno W L Nascimento, Ana Mércia D Nascimento, Dimitri E Pacheco, Adriana C Soares, Ricardo N Araujo, Mauricio R V Sant'Anna, Grasielle C D Pessoa, Nelder F Gontijo, Marcos H Pereira
Rhodnius prolixus expresses nitric oxide synthase (NOS) in the cytosol of the salivary gland (SG) cells. The NO produced is stored in the SG lumen bound to NO-carrier haemeproteins called nitrophorins (NPs). NPs bind tightly to NO in the acidic SG lumen, but release NO when the pH becomes high, e.g., at the host skin (pH~7.4). NO elicits potent and transient relaxation of vascular smooth muscle. Here, we investigated the role of salivary NO in the R. prolixus feeding behaviour and the salivary vasodilator activity of the host microcirculation...
November 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29161488/identifying-trypanosoma-cruzi-discreet-typing-units-in-triatomines-collected-in-different-natural-regions-of-per%C3%A3%C2%BA
#14
Carlos P Padilla, Uriel Alvarado, Gladis Ventura, Deysi Luna-Caipo, Marcial Suárez, José R Tuñoque, Nancy Ruelas-Llerena, Luis A Fachín, Alina Huiza, Lizandro Gonzáles, Julio César Carranza, Gustavo Adolfo Vallejo, Gustavo Adolfo Vallejo, Abraham G Cáceres, Abraham G Cáceres
INTRODUCTION: Trypanosoma cruzi has been divided by international consensus into six discrete typing units (DTU): TcI, TcII, TcIII, TcIV, TcV y TcVI. The factors determining the dynamics of T. cruzi genotypes vector transmission of Chagas' disease in the different geographical regions of Perú are still unknown. OBJECTIVE: To detect and type T. cruzi DTUs from the faeces of seven species of triatomines (Panstrongylus chinai, P. geniculatus, P. herreri, Rhodnius robustus, R...
March 29, 2017: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/29161477/-insecticidal-action-of-synthetic-girgensohnine-analogues-and-essential-oils-on-rhodnius-prolixus-hemiptera-reduviidae
#15
Juliana Cuadros, Aurora L Carreño, Vladimir V Kouznetsov, Jonny E Duque
INTRODUCTION: The alkaloid girgensohnine has been used as a natural model in the synthesis of new alkaloid-like alpha-aminonitriles with insecticidal effect against disease vectors. OBJECTIVE: To evaluate the biocide activity of girgensohnine analogues and essential oils of Cymbopogon flexuosus, Citrus sinensis and Eucalyptus citriodora in stage I and stage V Rhodnius prolixus nymphs. MATERIALS AND METHODS: We used a topical application model in tergites and sternites, as well as exposure to treated surfaces with different exploratory doses of each of the molecules and essential oils to determine the lethal doses (LD50 and LD95)...
March 29, 2017: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/29160509/sympatry-influence-in-the-interaction-of-trypanosoma-cruzi-with-triatomine
#16
Elaine Schultz Dworak, Silvana Marques de Araújo, Mônica Lúcia Gomes, Miyoko Massago, Érika Cristina Ferreira, Max Jean de Ornelas Toledo
INTRODUCTION: Trypanosoma cruzi, the etiologic agent of Chagas disease, is widely distributed in nature, circulating between triatomine bugs and sylvatic mammals, and has large genetic diversity. Both the vector species and the genetic lineages of T. cruzi present a varied geographical distribution. This study aimed to verify the influence of sympatry in the interaction of T. cruzi with triatomines. Methods: The behavior of the strains PR2256 (T. cruzi II) and AM14 (T. cruzi IV) was studied in Triatoma sordida (TS) and Rhodnius robustus (RR)...
September 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/29157359/countercurrent-heat-exchange-and-thermoregulation-during-blood-feeding-in-kissing-bugs
#17
Chloé Lahondère, Teresita C Insausti, Rafaela Mm Paim, Xiaojie Luan, George Belev, Marcos H Pereira, Juan P Ianowski, Claudio R Lazzari
Blood-sucking insects experience thermal stress at each feeding event on endothermic vertebrates. We used thermography to examine how kissing-bugs Rhodnius prolixus actively protect themselves from overheating. During feeding, these bugs sequester and dissipate the excess heat in their heads while maintaining an abdominal temperature close to ambient. We employed a functional-morphological approach, combining histology, µCT and X-ray-synchrotron imaging to shed light on the way these insects manage the flow of heat across their bodies...
November 21, 2017: ELife
https://www.readbyqxmd.com/read/29154947/16s-rrna-gene-amplicon-sequencing-reveals-dominance-of-actinobacteria-in-rhodnius-pallescens-compared-to-triatoma-maculata-midgut-microbiota-in-natural-populations-of-vector-insects-from-colombia
#18
Luisa M Montoya-Porras, Triana-Chavez Omar, Juan F Alzate, Claudia X Moreno-Herrera, Gloria E Cadavid-Restrepo
Chagas disease affects more than 6 million people in Latin America, it is a parasitic disease caused by the protozoan Trypanosoma cruzi, which is transmitted mainly by bloodsucking insects of the Triatominae subfamily. Studies on microbial communities that inhabit the insect gut are important to understanding their role in the parasite transmission and development. The present work aims to evaluate the gut bacterial composition of natural populations of triatomine species from Vichada and Magdalena, administrative states called departments in Colombia, using high-throughput sequencing technologies...
February 2018: Acta Tropica
https://www.readbyqxmd.com/read/29145405/drivers-of-house-invasion-by-sylvatic-chagas-disease-vectors-in-the-amazon-cerrado-transition-a-multi-year-state-wide-assessment-of-municipality-aggregated-surveillance-data
#19
Raíssa N Brito, David E Gorla, Liléia Diotaiuti, Anália C F Gomes, Rita C M Souza, Fernando Abad-Franch
BACKGROUND: Insecticide spraying efficiently controls house infestation by triatomine bugs, the vectors of Trypanosoma cruzi. The strategy, however, is ineffective against sylvatic triatomines, which can transmit Chagas disease by invading (without colonizing) man-made structures. Despite growing awareness of the relevance of these transmission dynamics, the drivers of house invasion by sylvatic triatomines remain poorly understood. METHODS/FINDINGS: About 12,000 sylvatic triatomines were caught during routine surveillance in houses of Tocantins state, Brazil, in 2005-2013...
November 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29138480/nitric-oxide-contributes-to-high-salt-perception-in-a-blood-sucking-insect-model
#20
Agustina Cano, Gina Pontes, Valeria Sfara, Diego Anfossi, Romina B Barrozo
In all organisms, salts produce either appetitive or aversive responses depending on the concentration. While low-salt concentration in food elicits positive responses to ingest, high-salt triggers aversion. Still the mechanisms involved in this dual behavior have just started to be uncovered in some organisms. In Rhodnius prolixus, using pharmacological and behavioral assays, we demonstrated that upon high-salt detection in food a nitric oxide (NO) dependent cascade is activated. This activation involves a soluble guanylate cyclase (sGC) and the production of cyclic guanosine monophosphate (cGMP)...
November 14, 2017: Scientific Reports
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