keyword
MENU ▼
Read by QxMD icon Read
search

midgut receptor insect

keyword
https://www.readbyqxmd.com/read/29777666/analysis-of-cross-resistance-to-vip3-proteins-in-eight-insect-colonies-from-four-insect-species-selected-for-resistance-to-bacillus-thuringiensis-insecticidal-proteins
#1
Joaquín Gomis-Cebolla, Yuequin Wang, Yudong Quan, Kanglai He, Tom Walsh, Bill James, Sharon Downes, Wendy Kain, Ping Wang, Kathy Leonard, Tom Morgan, Brenda Oppert, Juan Ferré
Bacillus thuringiensis Vip3 proteins are synthesized and secreted during the vegetative growth phase. They are activated by gut proteases, recognize and bind to midgut receptors, form pores and lyse cells. We tested the susceptibility to Vip3Aa and Vip3Ca of Cry1A-, Cry2A-, Dipel- and Vip3-resistant insect colonies from different species to determine whether resistance to other insecticidal proteins confers cross-resistance to Vip3 proteins. As expected, the colonies resistant to Cry1A proteins, Dipel (Helicoverpa armigera, Trichoplusia ni, Ostrinia furnacalis and Plodia interpunctella) or Cry2Ab (H...
May 16, 2018: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/29700928/labeling-membrane-receptors-with-lectins-and-evaluate-on-of-the-midgut-histochemistry-of-tuta-absoluta-meyrick-lepidoptera-gelechiidae-populations-with-different-levels-of-susceptibility-to-formulated-bt
#2
Andresa C B Oliveira, Valeria Wanderley-Teixeira, Cristiane T S Silva, Álvaro A C Teixeira, Herbert A A Siqueira, Glauciane S Cruz, Clovis L Neto, Amanda L R Lima, Maria T S Correia
BACKGROUND: Studies show that insects can adapt to the toxins of Bacillus thuringiensis in field and laboratory conditions through the development of resistance to this bacterium and its formulations. This has been demonstrated in the failure to control Tuta absoluta populations in Brazil. This study evaluated membrane receptors using peroxidase labelled lectins and the midgut histochemistry of T. absoluta populations in order to assess susceptibility to the insecticides Dipel® and XenTari® ...
April 26, 2018: Pest Management Science
https://www.readbyqxmd.com/read/29686508/first-report-of-detection-of-the-putative-receptor-of-bacillus-thuringiensis-toxin-vip3aa-from-black-cutworm-agrotis-ipsilon
#3
Gamal H Osman, Waleed J Altaf, Ibrahim A S Saleh, Raya Soltane, Hussein H Abulreesh, Ibrahim A Arif, Ahmed M Ramadan, Yehia A Osman
Black cutworm (BCW) Agrotis ipsilon , an economically important lepidopteran insect, has attracted a great attention. Bacillus thuringiensis (Bt) is spore forming soil bacteria and is an excellent environment-friendly approach for the control of phytophagous and disease-transmitting insects. In fact, bio-pesticide formulations and insect resistant transgenic plants based on the bacterium Bt delta-endotoxin have attracted worldwide attention as a safer alternative to harmful chemical pesticides. The major objective of the current study was to understand the mechanism of interaction of Bt toxin with its receptor molecule(s)...
March 2018: Saudi Journal of Biological Sciences
https://www.readbyqxmd.com/read/29476823/lipophorin-receptor-regulates-nilaparvata-lugens-fecundity-by-promoting-lipid-accumulation-and-vitellogenin-biosynthesis
#4
Kai Lu, Xia Chen, Yue Li, Wenru Li, Qiang Zhou
Insect lipophorin receptor (LpR) belongs to the low-density lipoprotein receptor (LDLR) superfamily and plays an essential role in fecundity by mediating the incorporation of lipophorin into developing oocytes. Here we report the identification and characterization of a full-length cDNA encoding a putative LpR from the brown planthopper, Nilaparvata lugens. The deduced amino acid sequence of NlLpR possesses the conserved structural motifs of LDLR family members, and displays a high degree of similarity with sequences from other insect LpRs...
May 2018: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
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
#5
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/29417892/drosophila-peptide-hormones-allatostatin-a-and-diuretic-hormone-31-exhibiting-complementary-gradient-distribution-in-posterior-midgut-antagonistically-regulate-midgut-senescence-and-adult-lifespan
#6
Koji Takeda, Takashi Okumura, Mayu Terahata, Mio Yamaguchi, Kiichiro Taniguchi, Takashi Adachi-Yamada
Enteroendocrine cells (EEs) are evolutionarily conserved gastrointestinal secretory cells that show scattered distribution in the intestinal epithelium. These cells classified into several subtypes based on the hormones they produce in both mammals and insects. In the fruit fly Drosophila, it has been suggested that nearly equal numbers of two subtypes of EEs (Allatostatin A: AstA and Diuretic hormone 31 : Dh31) are alternately produced from the intestinal stem cells in the posterior midgut. However, we found that these two subtypes are not always present in this manner, but are rather distributed in a complementary frequency gradient along the posterior midgut...
February 2018: Zoological Science
https://www.readbyqxmd.com/read/29415259/analysis-of-homologs-of-cry-toxin-receptor-related-proteins-in-the-midgut-of-a-non-bt-target-nilaparvata-lugens-st%C3%A3-l-hemiptera-delphacidae
#7
Ensi Shao, Li Lin, Sijun Liu, Jiao Zhang, Xuelin Chen, Li Sha, Zhipeng Huang, Biwang Huang, Xiong Guan
The brown planthopper (BPH) Nilaparvata lugens is one of the most destructive insect pests in the rice fields of Asia. Like other hemipteran insects, BPH is not susceptible to Cry toxins of Bacillus thuringiensis (Bt) or transgenic rice carrying Bt cry genes. Lack of Cry receptors in the midgut is one of the main reasons that BPH is not susceptible to the Cry toxins. The main Cry-binding proteins (CBPs) of the susceptible insects are cadherin, aminopeptidase N (APN), and alkaline phosphatase (ALP). In this study, we analyzed and validated de novo assembled transcripts from transcriptome sequencing data of BPH to identify and characterize homologs of cadherin, APN, and ALP...
February 5, 2018: Journal of Insect Science
https://www.readbyqxmd.com/read/29408155/the-full-length-cry1ac-protoxin-without-proteolytic-activation-exhibits-toxicity-against-insect-cell-line-cf-203
#8
Xiaodi Li, Feng Zhao, Xianfeng Qiu, Xiaomeng Ren, Xiangtao Mo, Xuezhi Ding, Liqiu Xia, Yunjun Sun
The new dual model for Bacillus thuringiensis insecticidal mechanism proposed that Cry1A protoxins without proteolytic activation could bind to insect midgut receptors to exert toxicity. To evaluate insecticidal potency of Cry1Ac protoxin at precluding interference of midgut proteases, the cytotoxicity of Cry1Ac protoxin against midgut cell line CF-203 derived from Choristoneura fumiferana was analyzed. It was revealed that Cry1Ac protoxin was toxic to CF-203 cells and there existed certain differences in the cytological changes when treated with protoxin and toxin...
February 2018: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/29338737/transcriptome-profiling-of-whitefly-guts-in-response-to-tomato-yellow-leaf-curl-virus-infection
#9
Liang Geng, Li-Xin Qian, Ruo-Xuan Shao, Yin-Quan Liu, Shu-Sheng Liu, Xiao-Wei Wang
BACKGROUND: Plant viruses in agricultural crops are of great concern worldwide, and over 75% of them are transmitted from infected to healthy plants by insect vectors. Tomato yellow leaf curl virus (TYLCV) is a begomovirus, which is the largest and most economically important group of plant viruses, transmitted by the whitefly Bemisia tabaci. The circulation of TYLCV in the insect involves complex insect-virus interactions, whereas the molecular mechanisms of these interactions remain ambiguous...
January 16, 2018: Virology Journal
https://www.readbyqxmd.com/read/29261729/nucleases-as-a-barrier-to-gene-silencing-in-the-cotton-boll-weevil-anthonomus-grandis
#10
Rayssa Almeida Garcia, Leonardo Lima Pepino Macedo, Danila Cabral do Nascimento, François-Xavier Gillet, Clidia Eduarda Moreira-Pinto, Muhammad Faheem, Angelina Maria Moreschi Basso, Maria Cristina Mattar Silva, Maria Fatima Grossi-de-Sa
RNA interference (RNAi) approaches have been applied as a biotechnological tool for controlling plant insect pests via selective gene down regulation. However, the inefficiency of RNAi mechanism in insects is associated with several barriers, including dsRNA delivery and uptake by the cell, dsRNA interaction with the cellular membrane receptor and dsRNA exposure to insect gut nucleases during feeding. The cotton boll weevil (Anthonomus grandis) is a coleopteran in which RNAi-mediated gene silencing does not function efficiently through dsRNA feeding, and the factors involved in the mechanism remain unknown...
2017: PloS One
https://www.readbyqxmd.com/read/29198647/isolation-functional-characterization-of-allatotropin-receptor-from-the-cotton-bollworm-helicoverpa-armigera
#11
Fang Zhang, Jun Wang, Kiran Thakur, Fei Hu, Jian-Guo Zhang, Xing-Fu Jiang, Shi-Hen An, Hongbo Jiang, Li Jiang, Zhao-Jun Wei
Insect allatotropin (AT) plays multi-functions including regulation of juvenile hormone synthesis, growth, development and reproduction. In the present study, the full-length cDNA encoding the AT receptor was cloned from the brain of Helicoverpa armigera (Helar-ATR). The ORF of Helar-ATR exhibited the characteristic seven transmembrane domains of the G protein-coupled receptor (GPCR) and was close to the ATR of Manduca sexta in the phylogenetic tree. The Helar-ATR expressed in vertebrate cell lines can be activated by Helar-AT and each Helar-ATL in a dose-responsive manner, in the following order: Helar-ATLI>Helar-ATLII>Helar-AT>Helar-ATLIII...
December 2, 2017: Peptides
https://www.readbyqxmd.com/read/29129205/the-steroid-hormone-20-hydroxyecdysone-upregulates-calcium-release-activated-calcium-channel-modulator-1-expression-to-induce-apoptosis-in-the-midgut-of-helicoverpa-armigera
#12
Yong-Bo Li, Xu-Yang Pei, Di Wang, Cai-Hua Chen, Mei-Juan Cai, Jin-Xing Wang, Xiao-Fan Zhao
Animal steroid hormones stimulate extracellular Ca(2+) influx into cells; however, the mechanism remains unclear. In this study, we determined that the Ca(2+) influx induced by steroid hormone 20-hydroxyecdysone (20E) is mediated by the calcium release-activated calcium channel modulator 1 (CRACM1/Orai1). The Orai1 mRNA is highly expressed during midgut programmed cell death in the lepidopteran insect Helicoverpa armigera. 20E upregulated the expression of Orai1 in H. armigera larvae and in an epidermal cell line (HaEpi)...
December 2017: Cell Calcium
https://www.readbyqxmd.com/read/29125862/peptidergic-control-in-a-fruit-crop-pest-the-spotted-wing-drosophila-drosophila-suzukii
#13
Caroline S Gough, Grace M Fairlamb, Petra Bell, Ronald J Nachman, Neil Audsley, R Elwyn Isaac
Neuropeptides play an important role in the regulation of feeding in insects and offer potential targets for the development of new chemicals to control insect pests. A pest that has attracted much recent attention is the highly invasive Drosophila suzukii, a polyphagous pest that can cause serious economic damage to soft fruits. Previously we showed by mass spectrometry the presence of the neuropeptide myosuppressin (TDVDHVFLRFamide) in the nerve bundle suggesting that this peptide is involved in regulating the function of the crop, which in adult dipteran insects has important roles in the processing of food, the storage of carbohydrates and the movement of food into the midgut for digestion...
2017: PloS One
https://www.readbyqxmd.com/read/28951282/accumulation-of-dsrna-in-endosomes-contributes-to-inefficient-rna-interference-in-the-fall-armyworm-spodoptera-frugiperda
#14
June-Sun Yoon, Dhandapani Gurusamy, Subba Reddy Palli
RNA interference (RNAi) efficiency varies among insects studied. The barriers for successful RNAi include the presence of double-stranded ribonucleases (dsRNase) in the lumen and hemolymph that could potentially digest double-stranded RNA (dsRNA) and the variability in the transport of dsRNA into and within the cells. We recently showed that the dsRNAs are transported into lepidopteran cells, but they are not processed into small interference RNAs (siRNAs) because they are trapped in acidic bodies. In the current study, we focused on the identification of acidic bodies in which dsRNAs accumulate in Sf9 cells...
November 2017: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28946649/the-incredible-journey-of-begomoviruses-in-their-whitefly-vector
#15
REVIEW
Henryk Czosnek, Aliza Hariton-Shalev, Iris Sobol, Rena Gorovits, Murad Ghanim
Begomoviruses are vectored in a circulative persistent manner by the whitefly Bemisia tabaci. The insect ingests viral particles with its stylets. Virions pass along the food canal and reach the esophagus and the midgut. They cross the filter chamber and the midgut into the haemolymph, translocate into the primary salivary glands and are egested with the saliva into the plant phloem. Begomoviruses have to cross several barriers and checkpoints successfully, while interacting with would-be receptors and other whitefly proteins...
September 24, 2017: Viruses
https://www.readbyqxmd.com/read/28942847/identification-and-preliminary-characterization-of-a-putative-c-type-lectin-receptor-like-protein-in-the-t-cruzi-tomato-lectin-endocytic-enriched-proteome
#16
Sébastien Brosson, Guy Bottu, Etienne Pays, Sabrina Bousbata, Didier Salmon
Trypanosoma cruzi, the etiological agent of the Chagas' disease in Latin America undergoes a complex life cycle involving two hosts, a mammalian host and a reduviid insect vector (triatomine). In the insect midgut the parasite multiplies as epimastigote forms, which rely on endocytosis for their energy requirement. We recently showed that posttranslational modification of endocytic N-glycoproteins by tomato lectin (TL) binding-N-glycans is crucial for receptor-mediated endocytosis (RME) in epimastigote forms...
December 2017: Microbiological Research
https://www.readbyqxmd.com/read/28919559/adipokinetic-hormone-receptor-gene-identification-and-its-role-in-triacylglycerol-mobilization-and-sexual-behavior-in-the-oriental-fruit-fly-bactrocera-dorsalis
#17
Qiu-Li Hou, Er-Hu Chen, Hong-Bo Jiang, Dan-Dan Wei, Shun-Hua Gui, Jin-Jun Wang, Guy Smagghe
Energy homeostasis requires continuous compensation for fluctuations in energy expenditure and availability of food resources. In insects, energy mobilization is under control of the adipokinetic hormone (AKH) where it is regulating the nutritional status by supporting the mobilization of lipids. In this study, we characterized the gene coding for the AKH receptor (AKHR) and investigated its function in the oriental fruit fly (Bactrocera dorsalis) that is economically one of the most important pest insects of tropical and subtropical fruit...
November 2017: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28840787/altering-plant-defenses-herbivore-associated-molecular-patterns-and-effector-arsenal-of-chewing-herbivores
#18
Saumik Basu, Suresh Varsani, Joe Louis
Chewing herbivores, such as caterpillars and beetles, while feeding on the host plant, cause extensive tissue damage and release a wide array of cues to alter plant defenses. Consequently, the cues can have both beneficial and detrimental impacts on the chewing herbivores. Herbivore-associated molecular patterns (HAMPs) are molecules produced by herbivorous insects that aid them to elicit plant defenses leading to impairment of insect growth, while effectors suppress plant defenses and contribute to increased susceptibility to subsequent feeding by chewing herbivores...
October 12, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28808417/down-regulation-of-aminopeptidase-n-and-abc-transporter-subfamily-g-transcripts-in-cry1ab-and-cry1ac-resistant-asian-corn-borer-ostrinia-furnacalis-lepidoptera-crambidae
#19
Tiantao Zhang, Brad S Coates, Yueqin Wang, Yidong Wang, Shuxiong Bai, Zhenying Wang, Kanglai He
The Asian corn borer (ACB), Ostrinia furnacalis (Lepidoptera: Crambidae), is a highly destructive pest of cultivated maize throughout East Asia. Bacillus thuringiensis (Bt) crystalline protein (Cry) toxins cause mortality by a mechanism involving pore formation or signal transduction following toxin binding to receptors along the midgut lumen of susceptible insects, but this mechanism and mutations therein that lead to resistance are not fully understood. In the current study, quantitative comparisons were made among midgut expressed transcripts from O...
2017: International Journal of Biological Sciences
https://www.readbyqxmd.com/read/28736530/identification-and-expression-profiling-of-chemosensory-genes-in-dendrolimus-punctatus-walker
#20
Su-Fang Zhang, Hui-Hui Liu, Xiang-Bo Kong, Hong-Bin Wang, Fu Liu, Zhen Zhang
Dendrolimus punctatus Walker is a serious pest affecting conifers in southern China. As extensive pesticide spraying is currently required to control D. punctatus, new control strategies are urgently needed. Chemosensory genes represent potential molecular targets for development of alternative pest control strategies, and the expression characteristics of these genes provide an indication of their function. To date, little information is available regarding chemosensory genes in D. punctatus or their expression profiles at different development stages and in various tissues...
2017: Frontiers in Physiology
keyword
keyword
117748
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"