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Visweshwar Regode, Sreeramulu Kuruba, Akbar S Mohammad, Hari C Sharma
Bacillus thuringiensis toxin proteins are deployed in transgenic plants for pest management. The present studies were aimed at characterization of gut bacterial proteases involved in activation of inactive Cry1Ac protoxin (pro-Cry1Ac) to active toxin in Helicoverpa armigera. Bacterial strains were isolated from H. armigera midgut and screened for their proteolytic activation toward pro-Cry1Ac. Among 12 gut bacterial isolates seven isolates showed proteolytic activity, and proteases from three isolates (IVS1, IVS2, and IVS3) were found to be involved in the proteolytic conversion of pro-Cry1Ac into active toxin...
2016: Frontiers in Microbiology
Gary Phillips, Ernest C Bernard, Robert J Pivar, John K Moulton, Rowland M Shelley
Twenty-four individuals of Narceus gordanus (Diplopoda: Spirobolidae) were collected in Ocala National Forest, FL, between November 2013 and July 2014. Each specimen was dissected to extract the intestine, which was removed and examined for parasitic nematodes. Coronostoma claireae n. sp. was collected from the hindgut and midgut of 10 specimens, and its morphology was examined with brightfield, differential interference contrast, phase contrast, and scanning electron microscopy. This species is separated from other Coronostoma spp...
September 2016: Journal of Nematology
Patrick Aghajanian, Shigeo Takashima, Manash Paul, Amelia Younossi-Hartenstein, Volker Hartenstein
The visceral musculature of the Drosophila intestine plays important roles in digestion as well as development. Detailed studies investigating the embryonic development of the visceral muscle exist; comparatively little is known about postembryonic development and metamorphosis of this tissue. In this study we have combined the use of specific markers with electron microscopy to follow the formation of the adult visceral musculature and its involvement in gut development during metamorphosis. Unlike the adult somatic musculature, which is derived from a pool of undifferentiated myoblasts, the visceral musculature of the adult is a direct descendant of the larval fibers, as shown by activating a lineage tracing construct in the larval muscle and obtaining labeled visceral fibers in the adult...
October 17, 2016: Developmental Biology
Oumar Bashir, Jerome P Claverie, Pierre Lemoyne, Charles Vincent
Bacillus thuringiensis (B. t.) based formulations have been widely used to control lepidopteran pests in agriculture and forestry. One of their weaknesses is their short residual activity when sprayed in the field. Using Pickering emulsions, mixtures of spores and crystals from three B. t. serovars were successfully encapsulated in colloïdosomal microparticles (50 μm) using innocuous chemicals (acrylic particles, sunflower oil, iron oxide nanoparticles, ethanol and water). A pH trigger mechanism was incorporated within the particles so that B...
2016: PeerJ
Sanae Sekihara, Toshio Shibata, Mai Hyakkendani, Shun-Ichiro Kawabata
We recently reported that transglutaminase (TG) suppresses immune deficiency pathway-controlled antimicrobial peptides (IMD-AMPs), thereby conferring immune tolerance to gut microbes, and that RNAi of the TG gene in flies decreases the lifespan compared with non-TG-RNAi flies. Here, analysis of the bacterial composition of the Drosophila gut by next-generation sequencing revealed that gut microbiota comprising one dominant genus of Acetobacter in non-TG-RNAi flies was shifted to that comprising two dominant genera of Acetobacter and Providencia in TG-RNAi flies...
October 19, 2016: Journal of Biological Chemistry
Gillian Hertlein, Marlene Seiffert, Sebastian Gensel, Eva Garcia-Gonzalez, Julia Ebeling, Ranko Skobalj, Anja Kuthning, Roderich D Süssmuth, Elke Genersch
The Gram-positive bacterium Paenibacillus larvae (P. larvae) is the causative agent of a deadly honey bee brood disease called American Foulbrood (AFB). AFB is a notifiable epizootic in most countries and, hence, P. larvae is of considerable relevance for veterinarians and apiculturists alike. Over the last decade, much progress has been made in the understanding of the (patho)biology of P. larvae. Recently, several non-ribosomally produced peptides (NRP) and peptide/polyketide (NRP/PK) hybrids produced by P...
2016: PloS One
Joaquín Gomis-Cebolla, Iñigo Ruiz de Escudero, Natalia Mara Vera-Velasco, Patricia Hernández-Martínez, Carmen Sara Hernández-Rodríguez, Tomás Ceballos, Leopoldo Palma, Baltasar Escriche, Primitivo Caballero, Juan Ferré
The Vip3Ca protein, discovered in a screening of Spanish collections of Bacillus thuringiensis, was known to be toxic to Chrysodeixis chalcites, Mamestra brassicae and Trichoplusia ni. In the present study, its activity has been tested with additional insect species and we found that Cydia pomonella is moderately susceptible to this protein. Vip3Ca (of approximately 90 kDa) was processed to an approximately 70 kDa protein when incubated with midgut juice in all tested species. The kinetics of proteolysis correlated with the susceptibility of the insect species to Vip3Ca...
October 15, 2016: Journal of Invertebrate Pathology
Nuredin Abduselam, Ahmed Zeynudin, Nicole Berens-Riha, Dinberu Seyoum, Michael Pritsch, Habtewold Tibebu, Kasahun Eba, Michael Hoelscher, Andreas Wieser, Delenasaw Yewhalaw
BACKGROUND: Around half of the global population is living in areas at risk of malaria infection. Plasmodium vivax malaria has become increasingly prevalent and responsible for a high health and socio-economic burden in Ethiopia. The availability of gametocyte carriers and mosquito species susceptible to P. vivax infection are vital for malaria transmission. Determining the susceptibility of vector species to parasite infection in space and time is important in vector control programs...
October 18, 2016: Parasites & Vectors
Marianna Nardozza, Donato Mele, Roberto Ferrari
We report the case of a 67-year-old woman with a carcinoid tumor of midgut origin who developed carcinoid heart disease and died because of bowel perforation. Echocardiography allowed the diagnosis, recognizing the typical abnormalities of tricuspid and pulmonary valve leaflets. The sonographic examination also evidenced peculiar alterations of the right heart hemodynamics: end-diastolic reversal of flow at the level of the pulmonary valve, reduced respiratory excursion without enlargement of the inferior vena cava, and biphasic hepatic venous flow without respiratory variation...
October 18, 2016: Journal of Clinical Ultrasound: JCU
Mehdi Helali, Céline Heimburger, Serge Rohr, Bernard Goichot, Alessio Imperiale
The localization of small bowel (SB) neuroendocrine tumors (NETs) remains a diagnostic challenge in clinical practice. In about a third of cases, SB-NETs are multiple at diagnosis. However, the sensitivity of conventional presurgical diagnostic investigations is not exhaustive. F-FDOPA (6-L-F-fluorodihydroxyphenylalanine) PET seems to be a valuable diagnostic technique for the detection of midgut NETs. According to our experience, a delayed PET/CT acquisition centered on abdominopelvic region and performed after oral hydration may improve the detection of primary tumor and the identification of patients with multifocal SB-NETs who could benefit from a more accurate intraoperative palpation of the entire SB...
October 5, 2016: Clinical Nuclear Medicine
Rodrigo Dutra Nunes, Guilherme Ventura-Martins, Débora Monteiro Moretti, Priscilla Medeiros-Castro, Carlucio Rocha-Santos, Carlos Renato de Oliveira Daumas-Filho, Paula Rego Barros Bittencourt-Cunha, Karina Martins-Cardoso, Cecília Oliveira Cudischevitch, Rubem Figueiredo Sadok Menna-Barreto, José Henrique Maia Oliveira, Desiely Silva Gusmão, Francisco José Alves Lemos, Daniela Sales Alviano, Pedro Lagerblad Oliveira, Carl Lowenberger, David Majerowicz, Ricardo Melo Oliveira, Rafael Dias Mesquita, Georgia Correa Atella, Mário Alberto Cardoso Silva-Neto
BACKGROUND: Mosquitoes feed on plant-derived fluids such as nectar and sap and are exposed to bioactive molecules found in this dietary source. However, the role of such molecules on mosquito vectorial capacity is unknown. Weather has been recognized as a major determinant of the spread of dengue, and plants under abiotic stress increase their production of polyphenols. RESULTS: Here, we show that including polyphenols in mosquito meals promoted the activation of AMP-dependent protein kinase (AMPK)...
October 2016: PLoS Neglected Tropical Diseases
Jian-Nan Liu, Zhi-Jun Yu, Li-Meng Liu, Ning-Xin Li, Rong-Rong Wang, Chun-Mian Zhang, Jing-Ze Liu
Francisella-like endosymbionts (FLEs) with significant homology to Francisella tularensis (γ-proteobacteria) have been characterized in several tick species, whereas knowledge on their distribution and population dynamics in ticks remains meager. Hence, in the current study, we identified a novel Francisella-like endosymbiont (FLEs-Hd) from the tick Haemaphysalis doenitzi and evaluated the putative functions of this symbiont. Results indicated that FLEs-Hd had 100% infection rate and a perfect vertical transmission in H...
October 12, 2016: Scientific Reports
Deborah C Jaworski, Chuanmin Cheng, Arathy D S Nair, Roman R Ganta
Monocytic ehrlichiosis in people caused by the intracellular bacterium, Ehrlichia chaffeensis, is an emerging infectious disease transmitted by the lone star tick, Amblyomma americanum. Tick transmission disease models for ehrlichiosis require at least two hosts and two tick blood feeding episodes to recapitulate the natural transmission cycle. One blood feeding is necessary for the tick to acquire the infection from an infected host and the next feeding is needed to transmit the bacterium to a naïve host...
September 28, 2016: Ticks and Tick-borne Diseases
Alejandro Alvarado-Delgado, Guillermo Perales Ortiz, Ángel T Tello-López, Sergio Encarnación, Renaud Conde, Ángel G Martínez-Batallar, Ken Moran-Francia, Humberto Lanz-Mendoza
BACKGROUND: The behaviour of Anopheles spp. mosquitoes, vectors for Plasmodium parasites, plays a crucial role in the propagation of malaria to humans. Consequently, it is important to understand how the behaviour of these mosquitoes is influenced by the interaction between the brain and immunological status. The nervous system is intimately linked to the immune and endocrine systems. There is evidence that the malaria parasite alters the function of these systems upon infecting the mosquito...
October 11, 2016: Parasites & Vectors
Didier Bouchon, Martin Zimmer, Jessica Dittmer
Bacterial symbionts represent essential drivers of arthropod ecology and evolution, influencing host traits such as nutrition, reproduction, immunity, and speciation. However, the majority of work on arthropod microbiota has been conducted in insects and more studies in non-model species across different ecological niches will be needed to complete our understanding of host-microbiota interactions. In this review, we present terrestrial isopod crustaceans as an emerging model organism to investigate symbiotic associations with potential relevance to ecosystem functioning...
2016: Frontiers in Microbiology
Rui Pang, Meng Chen, Zhikun Liang, Xiangzhao Yue, Hu Ge, Wenqing Zhang
The cytochrome P450 CYP6ER1 has been reported to play an important role in imidacloprid resistance of the brown planthopper (BPH), Nilaparvata lugens, and is overexpressed in most resistant populations. In the present study, we confirmed that CYP6ER1 expression can be induced by certain levels of imidacloprid. Developmental expression analysis revealed that CYP6ER1 was expressed highly in the adult stage, and tissue distribution analysis showed that CYP6ER1 was expressed mainly in the fat body and midgut. RNA interference (RNAi) of CYP6ER1 and transgenic expression of CYP6ER1 in Drosophila melanogaster both suggested that the expression of CYP6ER1 is sufficient to confer imidacloprid resistance...
October 10, 2016: Scientific Reports
Miao Xie, Na-Na Ren, Yan-Chun You, Wei-Jun Chen, Qi-Sheng Song, Min-Sheng You
BACKGROUND: Carboxylesterases (CarEs) are involved in metabolic detoxification of dietary and environmental xenobiotics in insects. However, due to the complexity of the protein family, the involvement of CarEs in insecticide metabolism in Plutella xylostella has not been fully elucidated. This study aimed to characterize two CarE genes and assess their potential roles in response to chlorpyrifos in P. xylostella. RESULTS: Synergistic test showed that triphenyl phosphate decreased the resistance of the 3(rd) -instar larvae to chlorpyrifos...
September 22, 2016: Pest Management Science
Patrick W Maes, Pedro A P Rodrigues, Randy Oliver, Brendon M Mott, Kirk E Anderson
Dysbiosis, defined as unhealthy shifts in bacterial community composition, can lower the colonization resistance of the gut to intrinsic pathogens. Here, we determined the effect of diet age and type on the health and bacterial community composition of the honeybee (Apis mellifera). We fed newly emerged bees fresh or aged diets, and then recorded host development and bacterial community composition from four distinct regions of the hosts' digestive tract. Feeding fresh pollen or fresh substitute, we found no difference in host mortality, diet consumption, development or microbial community composition...
September 26, 2016: Molecular Ecology
Shicheng Chen, Jiangchao Zhao, Deepak Joshi, Zhiyong Xi, Beth Norman, Edward D Walker
The bacteria in the midgut of Anopheles stephensi adult females from laboratory colonies were studied by sequencing the V4 region of 16S rRNA genes, with respect to three experimental factors: stable or cured Wolbachia infection; sugar or blood diet; and age. Proteobacteria and Bacteroidetes dominated the community [>90% of operational taxonomic units (OTUs)]; most taxa were in the classes Flavobacteriia, Gammaproteobacteria, and Alphaproteobacteria, and were assigned to Elizabethkingia (46.9%), Asaia (6...
2016: Frontiers in Microbiology
Xin Tang, Huawei Liu, Quanmei Chen, Xin Wang, Ying Xiong, Ping Zhao
The solute carrier 6 (SLC6) gene family, initially known as the neurotransmitter transporters, plays vital roles in the regulation of neurotransmitter signaling, nutrient absorption and motor behavior. In this study, a total of 16 candidate genes were identified as SLC6 family gene homologs in the silkworm (Bombyx mori) genome. Spatio-temporal expression patterns of silkworm SLC6 gene transcripts indicated that these genes were highly and specifically expressed in midgut, brain and gonads; moreover, these genes were expressed primarily at the feeding stage or adult stage...
October 3, 2016: International Journal of Molecular Sciences
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