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https://www.readbyqxmd.com/read/28636880/behavioral-evidence-of-oxidative-stress-by-hematophagy-in-the-ocellar-system-of-rhodnius-prolixus-st%C3%A3-l-1859-red-eyed-mutants
#1
Carlos Alberto Vija Suarez, Mario Iván Ortiz, Jorge Molina
The photonegative response to light stimulation in Rhodnius prolixus (Reduviidae, Triatominae) is modulated by compound eyes and ocelli. Screening pigments in the visual system have been shown to protect the cellular structures from the oxidative stress damage produced by blood ingestion and light stimulation. Red-eyed mutants of Rhodnius prolixus lack screening pigments in their compound eyes and ocelli and are exposed to more oxidative stress. Experiments with Rhodnius prolixus and Triatoma infestans red-eyed mutants reared from the first nymphal stage show damage in the retinas of the compound eyes and a decrease in photonegative responses due to light stimulation...
June 18, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28606853/proteomic-analysis-of-the-kissing-bug-rhodnius-prolixus-antenna
#2
Daniele S Oliveira, Nathalia F Brito, Fabio C S Nogueira, Monica F Moreira, Walter S Leal, Marcia R Soares, Ana C A Melo
Reception of odorants is essential in insects' life since the chemical signals in the environment (=semiochemicals) convey information about availability of hosts for a blood meal, mates for reproduction, sites for oviposition and other relevant information for fitness in the environment. Once they reach the antennae, these semiochemicals bind to odorant-binding proteins and are transported through the sensillar lymph until reach the odorant receptors. Such perireceptor events, particularly the interactions with transport proteins, are the liaison between the external environment and the entire neuroethological system and, therefore, a potential target to disrupt insect chemical communication...
June 9, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28602911/jaburetox-induced-toxic-effects-on-the-hemocytes-of-rhodnius-prolixus-hemiptera-reduviidae
#3
Natalia R Moyetta, Valquiria Broll, Ana Paula A Perin, Augusto F Uberti, Matheus V Coste Grahl, Fernanda Staniscuaski, Celia R Carlini, Leonardo L Fruttero
Jaburetox is a recombinant peptide derived from a Canavalia ensiformis urease that presents toxic effects upon several species of insects, phytopathogenic fungi and yeasts of medical importance. So far, no toxicity of Jaburetox to mammals has been shown. Previous reports have identified biochemical targets of this toxic peptide in insect models, although its mechanism of action is not completely understood. In this work, we aimed to characterize the effects of Jaburetox in hemolymphatic insect cells. For this purpose, the model insect and Chagas' disease vector Rhodnius prolixus was used...
June 8, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28562785/cytogenetic-analysis-in-different-populations-of-rhodnius-prolixus-and-r-nasutus-from-different-countries-of-south-america
#4
A Ravazi, K C C Alevi, J Oliveira, J A Rosa, M T V Azeredo-Oliveira
No abstract text is available yet for this article.
May 25, 2017: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/28553236/standardization-of-a-continuous-assay-for-glycosidases-and-its-use-for-screening-insect-gut-samples-at-individual-and-populational-levels
#5
Gerson S Profeta, Jessica A S Pereira, Samara G Costa, Patricia Azambuja, Eloi S Garcia, Caroline da Silva Moraes, Fernando A Genta
Glycoside Hydrolases (GHs) are enzymes able to recognize and cleave glycosidic bonds. Insect GHs play decisive roles in digestion, in plant-herbivore, and host-pathogen interactions. GH activity is normally measured by the detection of a release from the substrate of products as sugars units, colored, or fluorescent groups. In most cases, the conditions for product release and detection differ, resulting in discontinuous assays. The current protocols result in using large amounts of reaction mixtures for the obtainment of time points in each experimental replica...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28546079/pioneer-study-of-population-genetics-of-rhodnius-ecuadoriensis-hemiptera-reduviidae-from-the-central-coastand-southern-andean-regions-of-ecuador
#6
Anita G Villacís, Paula L Marcet, César A Yumiseva, Ellen M Dotson, Michel Tibayrenc, Simone Frédérique Brenière, Mario J Grijalva
Effective control of Chagas disease vector populations requires a good understanding of the epidemiological components, including a reliable analysis of the genetic structure of vector populations. Rhodnius ecuadoriensis is the most widespread vector of Chagas disease in Ecuador, occupying domestic, peridomestic and sylvatic habitats. It is widely distributed in the central coast and southern highlands regions of Ecuador, two very different regions in terms of bio-geographical characteristics. To evaluate the genetic relationship among R...
May 22, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28527286/-possible-oral-transmission-of-chagas-disease-among-hydrocarbons-sector-workers-in-casanare-colombia-2014
#7
Liliana Patricia Zuleta-Dueñas, Ángela Johana López-Quiroga, Fernando Torres-Torres, Oneida Castañeda-Porras
INTRODUCTION: Trypanosoma cruzi, the etiological agent for Chagas disease, can be transmitted by oral intake of contaminated food or drinks. During epidemiological week 14 of 2014, two cases of acute Chagas disease were notified among hydrocarbons sector workers in Paz de Ariporo, Casanare. OBJECTIVE: To characterize the affected population, to establish control and prevention measures and to confirm the outbreak. MATERIALS AND METHODS: We conducted an outbreak investigation that included the following components: a) Search for symptomatic people compatible with Chagas disease according to the case definition for their referral to medical services; b) entomological survey (192/197 houses); c) sanitary inspection and microbiological analysis of food samples; and d) study of reservoirs...
June 1, 2017: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/28527250/-risk-of-transmission-of-chagas-disease-by-intrusion-of-triatomines-and-wild-mammals-in-bucaramanga-santander-colombia
#8
Marlene Reyes, Ángela Torres, Lyda Esteban, Mónica Flórez, Víctor Manuel Angulo
INTRODUCTION: Notice of triatomines in dwellings of some neighborhoods in Bucaramanga motivated the realization of this study.Objetive: To evaluate the intrusion of triatomines and mammals, as well as some risk factors in urban dwellings. MATERIALS AND METHODS: Triatomines were collected in a neighborhood in Bucaramanga, Santander, on a monthly basis during one year with participation of the community. Collection included manual search in lamp posts, use of light traps, animal bait, and chemical attractants in nearby forests...
January 24, 2017: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/28527247/-diversity-of-triatominae-hemiptera-reduviidae-in-santander-colombia-epidemiological-implications
#9
Lyda Esteban, José Mauricio Montes, Víctor Manuel Angulo
INTRODUCTION: Domestic and wild triatomines in the department of Santander have an epidemiological impact, as recently they have been linked to outbreaks of acute Chagas disease. The analysis of their diversity and temporal variation contributes to the understanding of their biology and ecology in one of the most endemic areas of the country. OBJECTIVES: To analyze triatominae diversity in two regions of Santander. MATERIALS AND METHODS: We analyzed the triatomine records for Santander contained in the CINTROP-UIS entomology lab database...
January 24, 2017: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/28469016/developmental-roles-of-tyrosine-metabolism-enzymes-in-the-blood-sucking-insect-rhodnius-prolixus
#10
Marcos Sterkel, Pedro L Oliveira
The phenylalanine/tyrosine degradation pathway is frequently described as a catabolic pathway that funnels aromatic amino acids into citric acid cycle intermediates. Previously, we demonstrated that the accumulation of tyrosine generated during the hydrolysis of blood meal proteins in Rhodnius prolixus is potentially toxic, a harmful outcome that is prevented by the action of the first two enzymes in the tyrosine degradation pathway. In this work, we further evaluated the relevance of all other enzymes involved in phenylalanine/tyrosine metabolism in the physiology of this insect...
May 17, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28449112/phenotypic-variability-of-the-amazonian-species-rhodnius-brethesi-hemiptera-reduviidae
#11
A C Souza, S Catalá, A L Carbajal de la Fuente, A C V Junqueira
The wild species Rhodnius brethesi (Matta, 1919) (Hemiptera: Reduviidae) is found in areas of piassabais in microregion of Rio Negro, Amazonas, Brazil. Its geographical distribution overlaps the areas of Leopoldinia piassaba palm. In areas where palm trees are found, transmission cycle of Trypanosoma cruzi is related to the extractive activity of the palm fiber, exposing workers to wild vector transmission of this parasite. The close association with the palm tree L. piassaba suggests that this wild triatomine has special features in its sensory system allowing specificity of ecotope...
April 25, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28432816/rhodnius-prolixus-from-classical-physiology-to-modern-developmental-biology
#12
REVIEW
Rodrigo Nunes-da-Fonseca, Mateus Berni, Vitória Tobias-Santos, Attilio Pane, Helena Marcolla Araujo
The hemiptera Rhodnius prolixus is a blood-feeding insect and a primary vector of Trypanosoma cruzi, the etiological agent of the Chagas disease. Over the past century, Rhodnius has been the subject of intense investigations, which have contributed to unveil important aspects of metabolism and physiology in insects. Recent technological innovations are helping dissect the genetic and molecular underpinnings of Rhodnius embryogenesis and organogenesis, thus fostering the use of this important species in the fields of developmental and evolutionary biology...
May 2017: Genesis: the Journal of Genetics and Development
https://www.readbyqxmd.com/read/28406967/differential-transcriptome-analysis-supports-rhodnius-montenegrensis-and-rhodnius-robustus-hemiptera-reduviidae-triatominae-as-distinct-species
#13
Danila Blanco de Carvalho, Carlos Congrains, Samira Chahad-Ehlers, Heloisa Pinotti, Reinaldo Alves de Brito, João Aristeu da Rosa
Chagas disease is one of the main parasitic diseases found in Latin America and it is estimated that between six and seven million people are infected worldwide. Its etiologic agent, the protozoan Trypanosoma cruzi, is transmitted by triatomines, some of which from the genus Rhodnius. Twenty species are currently recognized in this genus, including some closely related species with low levels of morphological differentiation, such as Rhodnius montenegrensis and Rhodnius robustus. In order to investigate genetic differences between these two species, we generated large-scale RNA-sequencing data (consisting of four RNA-seq libraries) from the heads and salivary glands of males of R...
2017: PloS One
https://www.readbyqxmd.com/read/28274885/molecular-identification-of-wild-triatomines-of-the-genus-rhodnius-in-the-bolivian-amazon-strategy-and-current-difficulties
#14
Simone Frédérique Brenière, Edwin Wily Condori, Rosio Buitrago, Luis Fernando Sosa, Catarina Lopes Macedo, Christian Barnabé
The Amazon region has recently been considered as endemic in Latin America. In Bolivia, the vast Amazon region is undergoing considerable human migrations and substantial anthropization of the environment, potentially renewing the danger of establishing the transmission of Chagas disease. The cases of human oral contamination occurring in 2010 in the town of Guayaramerín provided reasons to intensify research. As a result, the goal of this study was to characterize the species of sylvatic triatomines circulating in the surroundings of Yucumo (Beni, Bolivia), a small Amazonian city at the foot of the Andes between the capital (La Paz) and Trinidad the largest city of Beni...
March 6, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28254111/celebrating-the-sequencing-of-the-rhodnius-prolixus-genome-a-tribute-to-the-memory-of-vincent-b-wigglesworth
#15
EDITORIAL
Claudio R Lazzari
No abstract text is available yet for this article.
February 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28235907/octopamine-and-tyramine-regulate-the-activity-of-reproductive-visceral-muscles-in-the-adult-female-blood-feeding-bug-rhodnius-prolixus
#16
Sam Hana, Angela B Lange
The role of octopamine and tyramine in regulating spontaneous contractions of reproductive tissues was examined in the female Rhodnius prolixus Octopamine decreased the amplitude of spontaneous contractions of the oviducts and reduced RhoprFIRFa-induced contractions in a dose-dependent manner, whereas tyramine only reduced the RhoprFIRFa-induced contractions. Both octopamine and tyramine decreased the frequency of spontaneous bursal contractions and completely abolished the contractions at 5×10(-7) M and above...
February 24, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28199333/comparative-and-functional-triatomine-genomics-reveals-reductions-and-expansions-in-insecticide-resistance-related-gene-families
#17
Lucila Traverso, Andrés Lavore, Ivana Sierra, Victorio Palacio, Jesús Martinez-Barnetche, José Manuel Latorre-Estivalis, Gaston Mougabure-Cueto, Flavio Francini, Marcelo G Lorenzo, Mario Henry Rodríguez, Sheila Ons, Rolando V Rivera-Pomar
BACKGROUND: Triatomine insects are vectors of Trypanosoma cruzi, a protozoan parasite that is the causative agent of Chagas' disease. This is a neglected disease affecting approximately 8 million people in Latin America. The existence of diverse pyrethroid resistant populations of at least two species demonstrates the potential of triatomines to develop high levels of insecticide resistance. Therefore, the incorporation of strategies for resistance management is a main concern for vector control programs...
February 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28145576/differences-in-competitive-ability-for-the-occupancy-of-shelters-in-triatomines
#18
C A Zacharias, S A Minoli, G Manrique
Triatomines (Hemiptera: Reduviidae: Triatominae) are nocturnal blood-sucking insects. During daylight hours they remain in an akinetic state inside their shelters, whereas at dusk they become active and move outside. When they are outside their shelters during the photophase, triatomines are vulnerable to diurnal predators and the period just before dawn is critical to their survival. This work analyses the existence of competitive interactions involved in the occupancy of shelters by triatomines. Behavioural assays were performed in which nymphs of different stages, nutritional status or species were released in an experimental arena containing a space-limited artificial shelter...
February 1, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28143573/the-modern-morphometric-approach-to-identify-eggs-of-triatominae
#19
Soledad Santillán-Guayasamín, Anita G Villacís, Mario J Grijalva, Jean-Pierre Dujardin
BACKGROUND: Egg morphometrics in the Triatominae has proved to be informative for distinguishing tribes or genera, and has been based generally on traditional morphometrics. However, more resolution is required, allowing species or even population recognition, because the presence of eggs in the domicile could be related to the species ability to colonize human dwellings, suggesting its importance as a vector. RESULTS: We explored the resolution of modern morphometric methods to distinguish not only tribes and genera, but also species or geographic populations in some important Triatominae...
January 31, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28108369/jaburetox-affects-gene-expression-and-enzyme-activities-in-rhodnius-prolixus-a-chagas-disease-vector
#20
Leonardo L Fruttero, Natalia R Moyetta, Monique Siebra Krug, Valquiria Broll, Matheus V Coste Grahl, Rafael Real-Guerra, Fernanda Stanisçuaski, Celia R Carlini
Jaburetox, a recombinant peptide of ∼11kDa derived from one of the Canavalia ensiformis (Jack Bean) urease isoforms, is toxic and lethal to insects belonging to different orders when administered orally or via injection. Previous findings indicated that Jaburetox acts on insects in a complex fashion, inhibiting diuresis and the transmembrane potential of Malpighian tubules, interfering with muscle contractility and affecting the immune system. In vitro, Jaburetox forms ionic channels and alters permeability of artificial lipid membranes...
January 17, 2017: Acta Tropica
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