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https://www.readbyqxmd.com/read/28197218/polysomnographic-findings-in-infants-with-pierre-robin-sequence
#1
Abdullah Khayat, Saadoun Bin-Hassan, Suhail Al-Saleh
INTRODUCTION: Pierre Robin sequence (PRS) is characterized by the triad of micrognathia, glossoptosis, and upper airway obstruction. It is commonly associated with the secondary cleft palate. Infants with PRS commonly have sleep-disordered breathing (SDB); including obstructive sleep apnea (OSA) as well as central sleep breathing abnormalities that are present from infancy. AIM OF THE STUDY: Evaluate the prevalence and severity of SDB in infants with PRS using polysomnography (PSG)...
January 2017: Annals of Thoracic Medicine
https://www.readbyqxmd.com/read/28185724/simplifying-nature-towards-the-design-of-broad-spectrum-kinetoplastid-inhibitors-inspired-by-acetogenins
#2
Eoin R Gould, Elizabeth F B King, Stefanie K Menzies, Andrew L Fraser, Lindsay B Tulloch, Marija K Zacharova, Terry K Smith, Gordon J Florence
The need for new treatments for the neglected tropical diseases African sleeping sickness, Chagas disease and Leishmaniasis remains urgent with the diseases widespread in tropical regions, affecting the world's very poorest. We have previously reported bis-tetrahydropyran 1,4-triazole analogues designed as mimics of the annonaceous acetogenin natural product chamuvarinin, which maintained trypanocidal activity. Building upon these studies, we here report related triazole compounds with pendant heterocycles, mimicking the original butenolide of the natural product...
January 28, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28185085/h-dependent-inorganic-phosphate-uptake-in-trypanosoma-brucei-is-influenced-by-myo-inositol-transporter
#3
Thais Russo-Abrahão, Carolina Macedo Koeller, Michael E Steinmann, Stephanie Silva-Rito, Thaissa Marins-Lucena, Michele Alves-Bezerra, Naira Ligia Lima-Giarola, Iron Francisco de-Paula, Amaia Gonzalez-Salgado, Erwin Sigel, Peter Bütikofer, Katia Calp Gondim, Norton Heise, José Roberto Meyer-Fernandes
Trypanosoma brucei is an extracellular protozoan parasite that causes human African trypanosomiasis or "sleeping sickness". During the different phases of its life cycle, T. brucei depends on exogenous inorganic phosphate (Pi), but little is known about the transport of Pi in this organism. In the present study, we showed that the transport of (32)Pi across the plasma membrane follows Michaelis-Menten kinetics and is modulated by pH variation, with higher activity at acidic pH. Bloodstream forms presented lower Pi transport in comparison to procyclic forms, that displayed an apparent K0...
February 9, 2017: Journal of Bioenergetics and Biomembranes
https://www.readbyqxmd.com/read/28162093/evaluating-the-impact-of-targeting-livestock-for-the-prevention-of-human-and-animal-trypanosomiasis-at-village-level-in-districts-newly-affected-with-t-b-rhodesiense-in-uganda
#4
Louise Hamill, Kim Picozzi, Jenna Fyfe, Beatrix von Wissmann, Sally Wastling, Nicola Wardrop, Richard Selby, Christine Amongi Acup, Kevin L Bardosh, Dennis Muhanguzi, John D Kabasa, Charles Waiswa, Susan C Welburn
BACKGROUND: Uganda has suffered from a series of epidemics of Human African Trypanosomiasis (HAT), a tsetse transmitted disease, also known as sleeping sickness. The area affected by acute Trypanosoma brucei rhodesiense HAT (rHAT) has been expanding, driven by importation of infected cattle into regions previously free of the disease. These regions are also affected by African Animal Trypanosomiasis (AAT) demanding a strategy for integrated disease control. METHODS: In 2008, the Public Private Partnership, Stamp Out Sleeping Sickness (SOS) administered a single dose of trypanocide to 31 486 head of cattle in 29 parishes in Dokolo and Kaberamaido districts...
February 6, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28138343/first-draft-genome-sequence-of-the-dourine-causative-agent-trypanosoma-equiperdum-strain-ovi
#5
Laurent Hébert, Bouziane Moumen, Anthony Madeline, Sascha Steinbiss, Latifa Lakhdar, Nick Van Reet, Philippe Büscher, Claire Laugier, Julien Cauchard, Sandrine Petry
Trypanosoma equiperdum is the causative agent of dourine, a sexually-transmitted infection of horses. This parasite belongs to the subgenus Trypanozoon that also includes the agent of sleeping sickness (Trypanosoma brucei) and surra (Trypanosoma evansi). We herein report the genome sequence of a T. equiperdum strain OVI, isolated from a horse in South-Africa in 1976. This is the first genome sequence of the T. equiperdum species, and its availability will provide important insights for future studies on genetic classification of the subgenus Trypanozoon...
2017: Journal of Genomics
https://www.readbyqxmd.com/read/28130217/longitudinal-evaluation-of-sleep-disordered-breathing-in-infants-with-prader-willi-syndrome
#6
Abdullah Khayat, Indra Narang, Saadoun Bin-Hasan, Reshma Amin, Suhail Al-Saleh
OBJECTIVE: To evaluate the course of sleep disordered breathing (SDB) in infants with Prader-Willi syndrome (PWS). DESIGN: Retrospective longitudinal observational study. SETTING: Sleep laboratory at The Hospital for Sick Children, Toronto, Canada. PATIENTS: Infants with PWS. MAIN OUTCOME MEASURES: The natural history of SDB in infants with PWS within 2 years from baseline assessment. RESULTS: We identified 28 (12 male) infants with PWS who had a baseline polysomnography (PSG) at a median age (interquartile (IQR)) of 0...
January 27, 2017: Archives of Disease in Childhood
https://www.readbyqxmd.com/read/28094002/the-rfamide-receptor-dmsr-1-regulates-stress-induced-sleep-in-c-elegans
#7
Michael J Iannacone, Isabel Beets, Lindsey E Lopes, Matthew A Churgin, Christopher Fang-Yen, Matthew D Nelson, Liliane Schoofs, David M Raizen
In response to environments that cause cellular stress, animals engage in sleep behavior that facilitates recovery from the stress. In Caenorhabditis elegans, stress-induced sleep(SIS) is regulated by cytokine activation of the ALA neuron, which releases FLP-13 neuropeptides characterized by an amidated arginine-phenylalanine (RFamide) C-terminus motif. By performing an unbiased genetic screen for mutants that impair the somnogenic effects of FLP-13 neuropeptides, we identified the gene dmsr-1, which encodes a G-protein coupled receptor similar to an insect RFamide receptor...
January 17, 2017: ELife
https://www.readbyqxmd.com/read/28087364/aquaglyceroporins-are-the-entry-pathway-of-boric-acid-in-trypanosoma-brucei
#8
Sabrina Marsiccobetre, Alexis Rodríguez-Acosta, Florian Lang, Katherine Figarella, Néstor L Uzcátegui
The boron element possesses a range of different effects on living beings. It is essential to beneficial at low concentrations, but toxic at excessive concentrations. Recently, some boron-based compounds have been identified as promising molecules against Trypanosoma brucei, the causative agent of sleeping sickness. However, until now, the boron metabolism and its access route into the parasite remained elusive. The present study addressed the permeability of T. brucei aquaglyceroporins (TbAQPs) for boric acid, the main natural boron species...
January 10, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28072517/arthropod-innate-immune-systems-and-vector-borne-diseases
#9
Richard H G Baxter, Alicia Contet, Kathryn Krueger
Arthropods, especially ticks and mosquitoes, are the vectors for a number of parasitic and viral human diseases, including malaria, sleeping sickness, Dengue, and Zika, yet arthropods show tremendous individual variation in their capacity to transmit disease. A key factor in this capacity is the group of genetically encoded immune factors that counteract infection by the pathogen. Arthropod-specific pattern recognition receptors and protease cascades detect and respond to infection. Proteins such as antimicrobial peptides, thioester-containing proteins, and transglutaminases effect responses such as lysis, phagocytosis, melanization, and agglutination...
February 8, 2017: Biochemistry
https://www.readbyqxmd.com/read/28069461/is-acute-mountain-sickness-related-to-trait-anxiety-a-normobaric-chamber-study
#10
Martin Niedermeier, Robb Waanders, Verena Menz, Maria Wille, Martin Kopp, Martin Burtscher
INTRODUCTION: Some mountaineers are more prone to the occurrence of acute mountain sickness (AMS) than others. State anxiety during altitude exposure might be associated with AMS development. We hypothesized that trait anxiety might be higher in AMS cases compared to non-AMS cases. The aim of the present study was to study the relationship between AMS development and trait anxiety. METHODS: In an observational study design, AMS incidence during a 12-hour exposure to normobaric hypoxia (FiO2=12...
January 6, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28063399/sleep-quality-among-elderly-high-altitude-dwellers-in-ladakh
#11
Ryota Sakamoto, Kiyohito Okumiya, Tsering Norboo, Norboo Tsering, Takayoshi Yamaguchi, Mitsuhiro Nose, Shinya Takeda, Toshihiro Tsukihara, Motonao Ishikawa, Shun Nakajima, Taizo Wada, Michiko Fujisawa, Hissei Imai, Yasuko Ishimoto, Yumi Kimura, Eriko Fukutomi, Wenling Chen, Kuniaki Otsuka, Kozo Matsubayashi
It has been already known that people who temporarily stay at high altitude may develop insomnia as a symptom of acute mountain sickness. However, much less is known about people living at high altitude. The aim of this study was to determine the effect of high altitude environment on sleep quality for the elderly who have been living at high altitude for their whole lives. A cross-sectional study was conducted in Domkhar valley at altitudes of 2800-4200m, Ladakh. Sleep quality was assessed using Insomnia Severity Index (ISI)...
December 29, 2016: Psychiatry Research
https://www.readbyqxmd.com/read/28056016/predicting-the-impact-of-intervention-strategies-for-sleeping-sickness-in-two-high-endemicity-health-zones-of-the-democratic-republic-of-congo
#12
Kat S Rock, Steve J Torr, Crispin Lumbala, Matt J Keeling
Two goals have been set for Gambian human African trypanosomiasis (HAT), the first is to achieve elimination as a public health problem in 90% of foci by 2020, and the second is to achieve zero transmission globally by 2030. It remains unclear if certain HAT hotspots could achieve elimination as a public health problem by 2020 and, of greater concern, it appears that current interventions to control HAT in these areas may not be sufficient to achieve zero transmission by 2030. A mathematical model of disease dynamics was used to assess the potential impact of changing the intervention strategy in two high-endemicity health zones of Kwilu province, Democratic Republic of Congo...
January 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28054952/computer-aided-drug-design-using-sesquiterpene-lactones-as-sources-of-new-structures-with-potential-activity-against-infectious-neglected-diseases
#13
REVIEW
Chonny Herrera Acevedo, Luciana Scotti, Mateus Feitosa Alves, Margareth De Fátima Formiga Melo Diniz, Marcus Tullius Scotti
This review presents an survey to the biological importance of sesquiterpene lactones (SLs) in the fight against four infectious neglected tropical diseases (NTDs)-leishmaniasis, schistosomiasis, Chagas disease, and sleeping sickness-as alternatives to the current chemotherapies that display several problems such as low effectiveness, resistance, and high toxicity. Several studies have demonstrated the great potential of some SLs as therapeutic agents for these NTDs and the relationship between the protozoal activities with their chemical structure...
January 3, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28049718/patterns-of-organelle-ontogeny-through-a-cell-cycle-revealed-by-whole-cell-reconstructions-using-3d-electron-microscopy
#14
Louise Hughes, Samantha Borrett, Katie Towers, Tobias Starborg, Sue Vaughan
The major mammalian bloodstream form of the African sleeping sickness parasite Trypanosoma brucei multiplies rapidly and it is important to understand how these cells divide. Organelle inheritance involves complex spatiotemporal re-arrangements to ensure correct distribution to daughter cells. Serial block face scanning electron microscopy (SBF-SEM) was used to reconstruct whole individual cells at different stages of the cell cycle to give an unprecedented temporal, spatial and quantitative view of organelle division, inheritance and abscission in a eukaryotic cell...
January 3, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28043795/evaluation-of-substituted-ebselen-derivatives-as-potential-trypanocidal-agents
#15
Heeren M Gordhan, Stephen L Patrick, Maria I Swasy, Amber L Hackler, Mark Anayee, Jennifer E Golden, James C Morris, Daniel C Whitehead
Human African trypanosomiasis is a disease of sub-Saharan Africa, where millions are at risk for the illness. The disease, commonly referred to as African sleeping sickness, is caused by an infection by the eukaryotic pathogen, Trypanosoma brucei. Previously, a target-based high throughput screen revealed ebselen (EbSe), and its sulfur analog, EbS, to be potent in vitro inhibitors of the T. brucei hexokinase 1 (TbHK1). These molecules also exhibited potent trypanocidal activity in vivo. In this manuscript, we synthesized a series of sixteen EbSe and EbS derivatives bearing electron-withdrawing carboxylic acid and methyl ester functional groups, and evaluated the influence of these substituents on the biological efficacy of the parent scaffold...
February 1, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28042865/the-role-of-natural-products-in-drug-discovery-and-development-against-neglected-tropical-diseases
#16
REVIEW
Peter Mubanga Cheuka, Godfrey Mayoka, Peggoty Mutai, Kelly Chibale
Endemic in 149 tropical and subtropical countries, neglected tropical diseases (NTDs) affect more than 1 billion people annually, including 875 million children in developing economies. These diseases are also responsible for over 500,000 deaths per year and are characterized by long-term disability and severe pain. The impact of the combined NTDs closely rivals that of malaria and tuberculosis. Current treatment options are associated with various limitations including widespread drug resistance, severe adverse effects, lengthy treatment duration, unfavorable toxicity profiles, and complicated drug administration procedures...
December 31, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28028818/a-mechanism-for-sickness-sleep-lessons-from-invertebrates
#17
Kristen C Davis, David M Raizen
During health, animal sleep is regulated by an internal clock and by the duration of prior wakefulness. During sickness, sleep is regulated by cytokines released from either peripheral cells or from cells within the nervous system. These cytokines regulate central nervous system neurons to induce sleep. Recent research in the invertebrates Caenorhabditis elegans and Drosophila melanogaster has led to new insights into the mechanism of sleep during sickness. Sickness is triggered by exposure to environments such as infection, heat, or ultraviolet light irradiation, all of which cause cellular stress...
December 28, 2016: Journal of Physiology
https://www.readbyqxmd.com/read/28008825/simulating-the-elimination-of-sleeping-sickness-with-an-agent-based-model
#18
Pascal Grébaut, Killian Girardin, Valentine Fédérico, François Bousquet
Although Human African Trypanosomiasis is largely considered to be in the process of extinction today, the persistence of human and animal reservoirs, as well as the vector, necessitates a laborious elimination process. In this context, modeling could be an effective tool to evaluate the ability of different public health interventions to control the disease. Using the Cormas(®) system, we developed HATSim, an agent-based model capable of simulating the possible endemic evolutions of sleeping sickness and the ability of National Control Programs to eliminate the disease...
2016: Parasite: Journal de la Société Française de Parasitologie
https://www.readbyqxmd.com/read/28007406/adipose-tissue-a-safe-haven-for-parasites
#19
REVIEW
Herbert B Tanowitz, Philipp E Scherer, Maria M Mota, Luisa M Figueiredo
Adipose tissue (AT) is no longer regarded as an inert lipid storage, but as an important central regulator in energy homeostasis and immunity. Three parasite species are uniquely associated with AT during part of their life cycle: Trypanosoma cruzi, the causative agent of Chagas disease; Trypanosoma brucei, the causative agent of African sleeping sickness; and Plasmodium spp., the causative agents of malaria. In AT, T. cruzi resides inside adipocytes, T. brucei is found in the interstitial spaces between adipocytes, while Plasmodium spp...
December 19, 2016: Trends in Parasitology
https://www.readbyqxmd.com/read/28002454/trypanosoma-brucei-invasion-and-t-cell-infiltration-of-the-brain-parenchyma-in-experimental-sleeping-sickness-timing-and-correlation-with-functional-changes
#20
Claudia Laperchia, Maria Palomba, Paul F Seke Etet, Jean Rodgers, Barbara Bradley, Paul Montague, Gigliola Grassi-Zucconi, Peter G E Kennedy, Marina Bentivoglio
BACKGROUND: The timing of Trypanosoma brucei entry into the brain parenchyma to initiate the second, meningoencephalitic stage of human African trypanosomiasis or sleeping sickness is currently debated and even parasite invasion of the neuropil has been recently questioned. Furthermore, the relationship between neurological features and disease stage are unclear, despite the important diagnostic and therapeutic implications. METHODOLOGY: Using a rat model of chronic Trypanosoma brucei brucei infection we determined the timing of parasite and T-cell neuropil infiltration and its correlation with functional changes...
December 2016: PLoS Neglected Tropical Diseases
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