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https://www.readbyqxmd.com/read/28331632/group-housed-females-promote-production-of-asexual-ootheca-in-american-cockroaches
#1
Ko Katoh, Masazumi Iwasaki, Shouhei Hosono, Atsushi Yoritsune, Masanori Ochiai, Makoto Mizunami, Hiroshi Nishino
BACKGROUND: Facultative parthenogenesis, seen in many animal phyla, is a reproductive strategy in which females are able to generate offspring when mating partners are unavailable. In some subsocial and eusocial insects, parthenogenesis is often more prevalent than sexual reproduction. However, little is known about how social cooperation is linked to the promotion of parthenogenesis. The domiciliary cockroach Periplaneta americana is well-suited to addressing this issue as this species belongs to the superfamily Blattoidea, which diverged into eusocial termites and shows facultative parthenogenesis...
2017: Zoological Letters
https://www.readbyqxmd.com/read/28317204/cockroach-allergen-serine-proteinases-isolation-sequencing-and-signalling-via-proteinase-activated-receptor-2-par2
#2
Danny J Polley, Koichiro Mihara, Rithwik Ramachandran, Harissios Vliagoftis, Bernard Renaux, Mahmoud Saifeddine, Michael O Daines, Scott Boitano, Morley D Hollenberg
BACKGROUND: Allergy to the German cockroach (Blattella germanica) is a significant asthma risk factor for inner-city communities. Cockroach, like other allergens, contains trypsin-like enzyme activity that contributes to allergenicity and airway inflammation by activating proteinase-activated receptors (PARs). To date, the enzymes responsible for the proteolytic activity of German cockroach allergen have not been characterized. OBJECTIVES: We aimed to identify, isolate and characterize the trypsin-like proteinases in German cockroach allergen extracts used for clinical skin tests...
March 20, 2017: Clinical and Experimental Allergy: Journal of the British Society for Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28228922/parasitic-gregarine-blattarum-found-infecting-american-cockroaches-periplaneta-americana-in-a-population-in-pulau-pinang-malaysia
#3
Zary Shariman Yahaya, Nik Ahmad Irwan Izzaudin, Ainul Farhana Abdul Razak
A study on the prevalence of a common endoparasite in the wild population of the American cockroach was conducted in Penang Island using a trapping method at several sampling sites on the island. Gregarine blattarum was found in the digestive tract in 5 out of 115, or 4.35%, of the wild American cockroaches, Periplaneta americana, that were sampled. This is the first report in Malaysia of Gregarine blattarum in local American cockroaches.
January 2017: Tropical Life Sciences Research
https://www.readbyqxmd.com/read/28188710/-prevalence-of-sensitization-to-inhalant-allergens-in-the-immunology-department-from-hospital-de-especialidades-pedi%C3%A3-tricas-mar%C3%A3-a-honduras-2016
#4
Victoria Alejandra Gonzales-González, Adolfo Martín Díaz-Flores, Karla Zobeyda Fernández-Zelaya, María Félix Rivera-Reyes
BACKGROUND: Allergic diseases are a public health problem; estimates indicate that between 30% and 40% of the world population is affected by some allergy. Knowing the prevalence of allergen sensitization allows for adequate diagnoses and treatments to be offered. In Honduras there are no studies available in pediatric patients. OBJECTIVE: The purpose of this research was to identify the most common types of sensitization in children and their correlation with the most common allergic diseases in patients on immunotherapy at the Maria Hospital of Pediatric Specialties...
January 2017: Revista Alergia Mexico: Organo Oficial de la Sociedad Mexicana de Alergia e Inmunología, A.C
https://www.readbyqxmd.com/read/28183995/structure-of-a-eukaryotic-voltage-gated-sodium-channel-at-near-atomic-resolution
#5
Huaizong Shen, Qiang Zhou, Xiaojing Pan, Zhangqiang Li, Jianping Wu, Nieng Yan
Voltage-gated sodium (Nav) channels are responsible for the initiation and propagation of action potentials. They are associated with a variety of channelopathies and are targeted by multiple pharmaceutical drugs and natural toxins. Here, we report the cryo-EM structure of a putative Nav channel from American cockroach (designated NavPaS) at 3.8-Å resolution. The voltage sensing domains (VSDs) of the four repeats exhibit distinct conformations. The entrance to the asymmetric selectivity filter vestibule is guarded by heavily glycosylated and disulfide bond-stabilized extracellular loops...
February 9, 2017: Science
https://www.readbyqxmd.com/read/28173695/the-american-cockroach-peptide-periplanetasin-2-blocks-clostridium-difficile-toxin-a-induced-cell-damage-and-inflammation-in-the-gut
#6
Ji Hong, Peng Zhang, I Na Yoon, Jae Sam Hwang, Jin Ku Kang, Ho Kim
Clostridium difficile, which causes pseudomembranous colitis, releases toxin A and toxin B. These toxins are considered to be the main causative agents for the disease pathogenesis, and their expression is associated with a marked increase of apoptosis in mucosal epithelial cells. Colonic epithelial cells are believed to form a physical barrier between the lumen and the submucosa, and abnormally increased mucosal epithelial cell apoptosis is considered to be an initial step in gut inflammation responses. Therefore, one approach to treating pseudomembranous colitis would be to develop agents that block the mucosal epithelial cell apoptosis caused by toxin A, thus restoring barrier function and curing inflammatory responses in the gut...
February 7, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28081263/molecular-and-functional-characterization-of-three-odorant-binding-protein-from-periplaneta-americana
#7
Zhao-Qun Li, Peng He, Ya-Nan Zhang, Shuang-Lin Dong
The American cockroach, Periplaneta americana, is a vector of many pathogenic organisms associated with human diseases. Olfaction plays a crucial role in guiding cockroach behaviors and contributes to their ability to transmit pathogens. Odorant binding proteins (OBPs), abundant in the insect olfactory sensilla, are important for insect olfaction. In this study, three OBP genes, PameOBP1, 2 and 3, were cloned from P. americana. Sequence alignment and phylogenetic analysis revealed that PameOBP1, 2 and 3 belong to the Minus-C OBP, Classic OBP, and Plus-C OBP subfamilies, respectively...
2017: PloS One
https://www.readbyqxmd.com/read/28032104/isolation-and-purification-of-an-antibacterial-protein-from-immune-induced-haemolymph-of-american-cockroach-periplaneta-americana
#8
Hamid Reza Basseri, Amir Dadi-Khoeni, Ronak Bakhtiari, Mandan Abolhassani, Reza Hajihosseini-Baghdadabadi
BACKGROUND: Antimicrobial peptides play a role as effectors substances in the immunity of vertebrate and invertebrate hosts. In the current study, antimicrobial peptide was isolated from the haemolymph of the American cockroach, Periplaneta americana. METHODS: Micrococcus luteus as Gram-positive bacteria and Escherichia coli as Gram-negative bacteria were candidate for injection. Induction was done by injecting both bacteria into the abdominal cavity of two groups of cockroaches separately...
December 2016: Journal of Arthropod-borne Diseases
https://www.readbyqxmd.com/read/28028170/influences-of-temperature-and-ootheca-age-on-the-life-history-of-the-cockroach-ootheca-parasitoid-aprostocetus-hagenowii-hymenoptera-eulophidae
#9
Hui-Siang Tee, Chow-Yang Lee
The influences of ootheca age and temperature on the life history of Aprostocetus hagenowii (Ratzeburg) (Hymenoptera: Eulophidae), a gregarious ootheca parasitoid of the American cockroach Periplaneta americana (L.) (Dictyoptera: Blattidae), were evaluated. Oothecae were incubated at 20, 25, and 30 °C to produce oothecae aged 1-60, 1-40, and 1-30 d old, respectively. Fitness traits (development time, percentage emergence, number of progeny, percentage female progeny, and female body size) of A. hagenowii developing in these different-aged oothecae were determined...
December 27, 2016: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28007552/the-potential-subunits-involved-in-two-subtypes-of-%C3%AE-bgt-resistant-nachrs-in-cockroach-dorsal-unpaired-median-dum-neurons
#10
Huahua Sun, Yang Liu, Jian Li, Xinzhu Cang, Haibo Bao, Zewen Liu
The american cockroach (Periplaneta americana) dorsal unpaired median (DUM) neurons provide an native tool to analyze the functional and pharmacological properties of ion channels and membrane receptors, such as nicotine acetylcholine receptors (nAChRs). Here the imidacloprid-activated nAChR subtypes were examined in DUM neurons by the patch-clamp technique and the potential subunits involved in important subtypes were analyzed by combining with RNA interference (RNAi) technique. Imidacloprid exerted agonist activities on one subtype in α-Bgt-sensitive nAChRs and another subtype in α-Bgt-resistant nAChRs, in which the α-Bgt-resistant subtype showed much higher sensitivity to imidacloprid than the α-Bgt-sensitive subtype, with the difference close to 200-fold...
February 2017: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/27979025/atopy-patch-test-in-children-with-atopic-dermatitis
#11
Nualanong Visitsunthorn, Sunsanee Chatpornvorarux, Punchama Pacharn, Orathai Jirapongsananuruk
BACKGROUND: Atopic dermatitis is frequently associated with food and/or aeroallergen allergy. OBJECTIVE: To evaluate atopy patch tests (APTs) and skin prick tests (SPTs) in children with atopic dermatitis, using allergen extracts from locally lyophilized foods (cow's milk, egg white, egg yolk, wheat, soy, and shrimp), Dermatophagoides pteronyssinus, Dermatophagoides farinae, and American cockroach. METHODS: This study was a prospective, self-controlled study in children with atopic dermatitis...
December 2016: Annals of Allergy, Asthma & Immunology
https://www.readbyqxmd.com/read/27929694/dna-methylation-levels-associate-with-race-and-childhood-asthma-severity
#12
Marcia A Chan, Christina E Ciaccio, Nicole M Gigliotti, Mo Rezaiekhaligh, Jacob A Siedlik, Kevin Kennedy, Charles S Barnes
OBJECTIVE: Asthma is a common chronic childhood disease worldwide. Socioeconomic status, genetic predisposition and environmental factors contribute to its incidence and severity. A disproportionate number of children with asthma are economically disadvantaged and live in substandard housing with potential indoor environmental exposures such as cockroaches, dust mites, rodents and molds. These exposures may manifest through epigenetic mechanisms that can lead to changes in relevant gene expression...
December 8, 2016: Journal of Asthma: Official Journal of the Association for the Care of Asthma
https://www.readbyqxmd.com/read/27793656/isolation-of-two-insecticidal-toxins-from-venom-of-the-australian-theraphosid-spider-coremiocnemis-tropix
#13
Maria P Ikonomopoulou, Jennifer J Smith, Volker Herzig, Sandy S Pineda, Sławomir Dziemborowicz, Sing-Yan Er, Thomas Durek, John Gilchrist, Paul F Alewood, Graham M Nicholson, Frank Bosmans, Glenn F King
Sheep flystrike is caused by parasitic flies laying eggs on soiled wool or open wounds, after which the hatched maggots feed on the sheep flesh and often cause large lesions. It is a significant economic problem for the livestock industry as infestations are difficult to control due to ongoing cycles of larval development into flies followed by further egg laying. We therefore screened venom fractions from the Australian theraphosid spider Coremiocnemis tropix to identify toxins active against the sheep blowfly Lucilia cuprina, which is the primary cause of flystrike in Australia...
December 1, 2016: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/27788884/analysis-of-10-environmental-allergen-components-of-the-american-cockroach-in-taiwan
#14
Mey-Fann Lee, Yi-Hsing Chen, Chu-Hui Chiang, Shyh-Jye Lin, Pei-Pong Song
BACKGROUND: Cockroaches are important sources of indoor airborne allergens. The American cockroach (Periplaneta americana) is the second leading inhalant allergen causing allergic airway diseases in Taiwan. We previously reported a difference in pathogenicity of different allergen components from American cockroaches. OBJECTIVE: To analyze the environmental profile of American cockroach allergen components. METHODS: Polyclonal antibodies were generated to recombinant American cockroach allergens, Per a 1 through Per a 10...
November 2016: Annals of Allergy, Asthma & Immunology
https://www.readbyqxmd.com/read/27787207/first-record-of-hammerschmidtiella-diesingi-hammerschmidt-1838-oxyuridomorpha-thelastomatidae-parasite-of-periplaneta-americana-linnaeus-1758-blattodea-blattidae-in-japan-morphological-and-molecular-characterization
#15
Rina Sriwati, Sota Ozawa, Jans Morffe, Koichi Hasegawa
Nematodes, belonging to the family Thelastomatidae, are parasites of saprophytic terrestrial arthropods, mainly cockroaches. American cockroach Periplaneta americana (Linnaeus, 1758) has high environmental adaptability, and has been spread worldwide by human activity. There are several reports of thelastomatid parasitic nematodes of P americana in the world. Here, the thelastomatid nematode Hammerschmidtiella diesingi (Hammerschmidt, 1838) (Oxyuridomorpha: Thelastomatidae), isolated from P americana is recorded for the first time in Japan...
December 1, 2016: Acta Parasitologica
https://www.readbyqxmd.com/read/27754403/label-free-differential-proteomics-and-quantification-of-exoenzymes-from-isolates-of-the-entomopathogenic-fungus-beauveria-bassiana
#16
Giuseppe Dionisio, Per Kryger, Tove Steenberg
Beauveria bassiana is an entomopathogenic fungus that grows both in vivo and in vitro. In vivo it can colonize live insect hosts, and tissue digestion occurs by secreted hydrolytic exoenzymes. It can also colonize dead insect tissue provided this is free from competing microorganisms. Depending on whether the host is alive or dead the expression (quality/quantity) of the exoenzymes may vary. We have grown several isolates of B. bassiana in shaking flasks for 120 h at 25 °C in order to evaluate the maximal exoenzyme production using two diet regimes...
October 14, 2016: Insects
https://www.readbyqxmd.com/read/27639501/blaptica-dubia-as-sentinels-for-exposure-to-chemical-warfare-agents-a-pilot-study
#17
Franz Worek, Thomas Seeger, Katharina Neumaier, Timo Wille, Horst Thiermann
The increased interest of terrorist groups in toxic chemicals and chemical warfare agents presents a continuing threat to our societies. Early warning and detection is a key component for effective countermeasures against such deadly agents. Presently available and near term solutions have a number of major drawbacks, e.g. lack of automated, remote warning and detection of primarily low volatile chemical warfare agents. An alternative approach is the use of animals as sentinels for exposure to toxic chemicals...
November 16, 2016: Toxicology Letters
https://www.readbyqxmd.com/read/27590811/the-core-gut-microbiome-of-the-american-cockroach-periplaneta-americana-is-stable-and-resilient-to-dietary-shifts
#18
Kara A Tinker, Elizabeth A Ottesen
The omnivorous cockroach Periplaneta americana hosts a diverse hindgut microbiota encompassing hundreds of microbial species. In this study, we used 16S rRNA gene sequencing to examine the effect of diet on the composition of the P. americana hindgut microbial community. Results show that the hindgut microbiota of P. americana exhibit a highly stable core microbial community with low variance in compositions between individuals and minimal community change in response to dietary shifts. This core hindgut microbiome is shared between laboratory-hosted and wild-caught individuals, although wild-caught specimens exhibited a higher diversity of low-abundance microbes that were lost following extended cultivation under laboratory conditions...
November 15, 2016: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/27514662/antagonist-pharmacology-of-desensitizing-and-non-desensitizing-nicotinic-acetylcholine-receptors-in-cockroach-neurons
#19
Vincent L Salgado
Two α-bungarotoxin-sensitive nicotinic acetylcholine (ACh) receptor subtypes in neurons of the American cockroach have been identified as desensitizing (nAChD) and selectively inhibitable with 100nM imidacloprid, and non-desensitizing (nAChN) and selectively inhibitable with 100pM methyllycaconitine. In this paper, the single-electrode voltage-clamp technique was used to measure concentration-response relations for the action of ACh and five antagonists on pharmacologically separated nAChD and nAChN receptors of acutely dissociated neurons from thoracic ganglia of the American cockroach...
September 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27511640/new-insights-into-the-infection-of-the-american-cockroach-periplaneta-americana-nymphs-with-metarhizium-anisopliae-s-l-ascomycota-hypocreales
#20
A C Gutierrez, J A R Machado, R Hubner-Campos, M A Pennisi, J Rodrigues, C C López Lástra, J J García, É K K Fernandes, C Luz
AIMS: To study the marked resistance of Periplaneta americana to entomopathogenic Metarhizium anisopliae. METHODS AND RESULTS: The low susceptibility of 4th instar nymphs applied topically with conidia seemed to be related to an active removal of conidia by the cockroach and to a disabled or retarded germination and subsequent development of conidia on the cuticle (up to 80% germination in the next 7 days after application). Inhibitions or delays of germination were related to the composition of the epicuticular fatty acids (30·1% w/w oleic, 28·3% w/w linoleic, 24·5% w/w palmitic and 11·7% w/w stearic acid) reported here...
November 2016: Journal of Applied Microbiology
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