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https://www.readbyqxmd.com/read/27903279/in-vitro-and-in-vivo-anti-malarial-activity-of-novel-harmine-analog-heat-shock-protein-90-inhibitors-a-possible-partner-for-artemisinin
#1
Abebe Genetu Bayih, Asongna Folefoc, Abu Naser Mohon, Scott Eagon, Marc Anderson, Dylan R Pillai
BACKGROUND: The emergence of artemisinin-resistant Plasmodium falciparum strains poses a serious challenge to the control of malaria. This necessitates the development of new anti-malarial drugs. Previous studies have shown that the natural beta-carboline alkaloid harmine is a promising anti-malarial agent targeting the P. falciparum heat-shock protein 90 (PfHsp90). The aim of this study was to test the anti-malarial activity of harmine analogues. METHODS: Forty-two harmine analogues were synthesized and the binding of these analogues to P...
December 1, 2016: Malaria Journal
https://www.readbyqxmd.com/read/27903001/right-in-front-of-our-eyes-evolution-of-streptococcal-toxic-shock-syndrome-with-ischemic-optic-neuropathy
#2
Salaheldin M Elhamamsy, Mazen O Al-Qadi, Taro Minami, Marguerite Neill
INTRODUCTION: Toxic shock syndrome occurs from dysregulation of host inflammatory responses. Toxin- producing strains of Group A streptococcus cause TSS. Ischemic optic neuropathy rarely complicates septic shock. We present a rare case of streptococcal pharyngitis complicated by septic arthritis and TSS with reversible blindness due to non-arteritic ischemic optic neuropathy. CASE: A 28-year-old man drove to our ED with exudative pharyngitis. A rapid streptococcal test was positive...
December 1, 2016: Rhode Island Medical Journal
https://www.readbyqxmd.com/read/27902390/virulence-determinants-in-clinical-staphylococcus-aureus-from-monomicrobial-and-polymicrobial-infections-of-diabetic-foot-ulcers
#3
Kavitha Shettigar, Spoorthi Jain, Deepika V Bhat, Raviraj Acharya, Lingadakai Ramachandra, Kapaettu Satyamoorthy, T S Murali
Antibiotic resistance in Staphylococcus aureus is a major public health concern and Methicillin Resistant S. aureus has emerged as an important pathogen. We characterized S. aureus isolates from monomicrobial and polymicrobial wound infections from 200 diabetic individuals with foot ulcers to understand their underlying diversity and pathogenicity. Staphylococcal Cassette Chromosome mec typing was performed and genes coding for production of biofilm, Panton-Valentine Leukocidin, Toxic Shock Syndrome Toxin, Leukotoxins DE and M were screened...
October 19, 2016: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/27890585/cadmium-in%C3%A2-vivo-exposure-alters-stress-response-and-endocrine-related-genes-in-the-freshwater-snail-physa-acuta-new-biomarker-genes-in-a-new-model-organism
#4
Pedro Martínez-Paz, Mónica Morales, Paloma Sánchez-Argüello, Gloria Morcillo, José Luis Martínez-Guitarte
The freshwater snail Physa acuta is a sensitive organism to xenobiotics that is appropriate for toxicity testing. Cadmium (Cd) is a heavy metal with known toxic effects on several organisms, which include endocrine disruption and activation of the cellular stress responses. There is scarce genomic information on P. acuta; hence, in this work, we identify several genes related to the hormonal system, the stress response and the detoxification system to evaluate the effects of Cd. The transcriptional activity of the endocrine-related genes oestrogen receptor (ER), oestrogen-related receptor (ERR), and retinoid X receptor (RXR), the heat shock proteins genes hsp70 and hsp90 and a metallothionein (MT) gene was analysed in P...
November 24, 2016: Environmental Pollution
https://www.readbyqxmd.com/read/27889514/cadmium-alters-the-expression-of-small-heat-shock-protein-genes-in-the-aquatic-midge-chironomus-riparius
#5
Raquel Martín-Folgar, José-Luis Martínez-Guitarte
Cadmium (Cd) is a widespread and highly toxic heavy metal of particular ecotoxicological relevance for aquatic ecosystems. It occurs naturally in the environment but is also an industrial pollutant with extensively researched carcinogenic potentials. Heat shock proteins (HSPs) are chaperones that play an important role in maintaining protein homeostasis under stress conditions. Small heat shock proteins (sHSPs) comprise the most diverse group of the HSPs family. They are expressed both constitutively and by stress-induction...
November 24, 2016: Chemosphere
https://www.readbyqxmd.com/read/27881530/menstrual-cups-and-sanitary-pads-to-reduce-school-attrition-and-sexually-transmitted-and-reproductive-tract-infections-a-cluster-randomised-controlled-feasibility-study-in-rural-western-kenya
#6
Penelope A Phillips-Howard, Elizabeth Nyothach, Feiko O Ter Kuile, Jackton Omoto, Duolao Wang, Clement Zeh, Clayton Onyango, Linda Mason, Kelly T Alexander, Frank O Odhiambo, Alie Eleveld, Aisha Mohammed, Anna M van Eijk, Rhiannon Tudor Edwards, John Vulule, Brian Faragher, Kayla F Laserson
OBJECTIVES: Conduct a feasibility study on the effect of menstrual hygiene on schoolgirls' school and health (reproductive/sexual) outcomes. DESIGN: 3-arm single-site open cluster randomised controlled pilot study. SETTING: 30 primary schools in rural western Kenya, within a Health and Demographic Surveillance System. PARTICIPANTS: Primary schoolgirls 14-16 years, experienced 3 menses, no precluding disability, and resident in the study area...
November 23, 2016: BMJ Open
https://www.readbyqxmd.com/read/27878271/estrogen-is-neuroprotective-against-hypoglycemic-injury-in-murine-n38-hypothalamic-cells
#7
Tandra R Chakraborty, Joshua Cohen, Darien Yohanan, Eilliut Alicea, Benjamin S Weeks, Sanjoy Chakraborty
Estrogen (E2) has been demonstrated to possess protective effects from hypoglycemic toxicity, particularly in the pancreas. In the central nervous system, several brain regions, such as the hypothalamus, are highly vulnerable to hypoglycemic injuries that may lead to seizures, coma, and mortality. The present study performed a novel in vitro assay of hypoglycemic injury to hypothalamic cells, and is the first study, to the best of our knowledge, to demonstrate that E2 protects hypothalamic cells from hypoglycemic toxicity...
November 18, 2016: Molecular Medicine Reports
https://www.readbyqxmd.com/read/27872278/reconstitution-of-a-mycobacterium-tuberculosis-proteostasis-network-highlights-essential-cofactor-interactions-with-chaperone-dnak
#8
Tania J Lupoli, Allison Fay, Carolina Adura, Michael S Glickman, Carl F Nathan
During host infection, Mycobacterium tuberculosis (Mtb) encounters several types of stress that impair protein integrity, including reactive oxygen and nitrogen species and chemotherapy. The resulting protein aggregates can be resolved or degraded by molecular machinery conserved from bacteria to eukaryotes. Eukaryotic Hsp104/Hsp70 and their bacterial homologs ClpB/DnaK are ATP-powered chaperones that restore toxic protein aggregates to a native folded state. DnaK is essential in Mycobacterium smegmatis, and ClpB is involved in asymmetrically distributing damaged proteins during cell division as a mechanism of survival in Mtb, commending both proteins as potential drug targets...
November 21, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27871512/case-report-management-of-differential-diagnosis-and-treatment-of-severe-anaphylaxis-in-the-setting-of-spinal-anesthesia
#9
Brian M Osman, Joni M Maga, Sebastian M Baquero
The purpose of this case report is to educate fellow anesthesiologists of a complicated differential diagnosis for sudden cardiovascular collapse after spinal anesthesia. We report a case where anaphylaxis occurred while under spinal anesthesia and resulted in difficult resuscitation. A 58-year-old woman undergoing bilateral knee replacements under spinal anesthesia experienced sudden seizure and cardiovascular collapse from acute anaphylactic shock while administering a cephalosporin. Local anesthetic toxicity, high spinal, and anaphylaxis were considered due to overlapping of symptoms...
December 2016: Journal of Clinical Anesthesia
https://www.readbyqxmd.com/read/27867390/the-mechanisms-of-maize-resistance-to-fusarium-verticillioides-by-comprehensive-analysis-of-rna-seq-data
#10
Yanping Wang, Zijian Zhou, Jingyang Gao, Yabin Wu, Zongliang Xia, Huiyong Zhang, Jianyu Wu
Fusarium verticillioides is the most commonly reported fungal species responsible for ear rot of maize which substantially reduces grain yield. It also results in a substantial accumulation of mycotoxins that give rise to toxic response when ingested by animals and humans. For inefficient control by chemical and agronomic measures, it thus becomes more desirable to select more resistant varieties. However, the molecular mechanisms underlying the infection process remain poorly understood, which hampers the application of quantitative resistance in breeding programs...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27863161/hla-dr-polymorphisms-influence-in-vivo-responses-to-staphylococcal-toxic-shock-syndrome-toxin-1-in-a-transgenic-mouse-model
#11
A Krogman, A Tilahun, C S David, V R Chowdhary, M P Alexander, G Rajagopalan
Toxic shock syndrome toxin-1 (TSST-1) is a potent superantigen produced by Staphylococcus aureus. In addition to menstrual and nonmenstrual toxic shock syndromes, TSST-1 is also implicated in the immunopathogenesis of pneumonia, infective endocarditis, neonatal exanthematous disease, and atopic dermatitis among others. Superantigens first bind to major histocompatibility complex (MHC) class II molecules and then activate a large proportion of T cells by cross-linking their T cell receptor. As binding to MHC class II molecules is a critical step in the robust activation of the immune system by TSST-1 and other superantigens, polymorphic variations between different HLA-DR alleles could potentially influence the magnitude of immune activation and immunopathology caused by TSST-1...
November 15, 2016: HLA
https://www.readbyqxmd.com/read/27862834/transcriptional-response-of-erwinia-amylovora-upon-copper-shock-in-vivo-role-of-the-copa-gene
#12
Begoña Águila-Clares, Luisa F Castiblanco, José Manuel Quesada, Ramón Penyalver, Juan Carbonell, María M López, Ester Marco-Noales, George W Sundin
Fire blight is a devastating plant disease caused by the bacterium Erwinia amylovora and its control frequently is based on the use of copper-based compounds, for which the mechanisms of action are not well known. Consequently, here we investigate the response of E. amylovora to copper shock by a whole genome microarray approach. Transcriptional analyses showed that, in the presence of copper, 23 genes were increased in expression; these genes were classified mainly into the transport and stress functional categories...
November 14, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/27859703/reinventing-hsp90-inhibitors-blocking-c-terminal-binding-events-to-hsp90-by-using-dimerized-inhibitors
#13
Yen Chin Koay, Hendra Wahyudi, Shelli R McAlpine
Heat shock protein 90 (Hsp90) is a molecular chaperone (90 kDa) that functions as a dimer. This protein facilitates the folding, assembly, and stabilization of more than 400 proteins that are responsible for cancer development and progression. Inhibiting Hsp90's function will shut down multiple cancer-driven pathways simultaneously because oncogenic clients rely heavily on Hsp90, which makes this chaperone a promising anticancer target. Classical inhibitors that block the binding of adenine triphosphate (ATP) to the N-terminus of Hsp90 are highly toxic to cells and trigger a resistance mechanism within cells...
November 11, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27858797/assessment-of-organic-micropollutants-occurrence-in-treated-wastewater-using-heat-shock-protein-47-stress-responses-in-chinese-hamster-ovary-cells-and-gc-ms-based-non-target-screening
#14
Selma Etteieb, Atsushi Kawachi, Junkyu Han, Foued Elayni, Jamila Tarhouni, Hiroko Isoda
Combining bioassays and analytical chemistry screening is a powerful approach to assess organic micropollutants which are the main contributors to toxic potential in complex mixtures of treated wastewater (TWW). The aim of this study was to perform a comprehensive toxicity assessment of treated effluents using stress response bioassays and then to assess the occurrence of the organic micropollutants which were responsible for this biological response using gas chromatography coupled with a mass spectrometry detector (GC/MS)...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27848904/-a-postpartum-woman-with-toxic-shock-syndrome-group-a-streptococcal-infection-a-much-feared-postpartum-complication
#15
K Abbink, J C Kortekaas, M P Buise, J Dokter, S M I Kuppens, T H M Hasaart
BACKGROUND: The development of toxic shock syndrome (TSS) after an invasive group A streptococcal (GAS) infection in the postpartum period is a much feared complication. The mortality rate of TSS with necrotizing fasciitis is 30 to 50%. CASE DESCRIPTION: We present the case of a woman with atypical pelvic pain which was the first symptom of toxic shock syndrome as a consequence of a GAS infection. Clinical deterioration necessitated a hysterectomy. Also a fasciotomy was performed as consequence of lower extremity compartment syndrome...
2016: Nederlands Tijdschrift Voor Geneeskunde
https://www.readbyqxmd.com/read/27835876/azadiradione-ameliorates-polyglutamine-expansion-disease-in-drosophila-by-potentiating-dna-binding-activity-of-heat-shock-factor-1
#16
Vinod K Nelson, Asif Ali, Naibedya Dutta, Suvranil Ghosh, Manas Jana, Arnab Ganguli, Andrei Komarov, Soumyadip Paul, Vibha Dwivedi, Subhrangsu Chatterjee, Nihar R Jana, Subhash C Lakhotia, Gopal Chakrabarti, Anup K Misra, Subhash C Mandal, Mahadeb Pal
Aggregation of proteins with the expansion of polyglutamine tracts in the brain underlies progressive genetic neurodegenerative diseases (NDs) like Huntington's disease and spinocerebellar ataxias (SCA). An insensitive cellular proteotoxic stress response to non-native protein oligomers is common in such conditions. Indeed, upregulation of heat shock factor 1 (HSF1) function and its target protein chaperone expression has shown promising results in animal models of NDs. Using an HSF1 sensitive cell based reporter screening, we have isolated azadiradione (AZD) from the methanolic extract of seeds of Azadirachta indica, a plant known for its multifarious medicinal properties...
October 26, 2016: Oncotarget
https://www.readbyqxmd.com/read/27834134/elucidation-of-antiangiogenic-potential-of-vitexin-obtained-from-cucumis-sativus-targeting-hsp90-protein-a-novel-multipathway-targeted-approach-to-restrain-angiogenic-phenomena
#17
Neha Sharma, Salman Akhtar, Qazi M Sajid Jamal, Mohammad A Kamal, M Kalim A Khan, M Haris Siddiqui, Usman Sayeed
BACKGROUND: Angiogenesis involves the process of sprouting of microvessels from preexisting microvasculature and is held responsible for the growth, malignancy and metastasis of cancer. Heat shock protein Hsp90 has been proven responsible for indirectly inducing multiple pathways leading to angiogenesis and metastasis in cancer. Recent researches shift towards proposing novel phytochemicals as possible antiangiogenic agents. OBJECTIVE: The study aims towards Virtual screening of compounds from Cucurbitaceae family and their Druglikeliness and PreADMET filtering in search of potent lead as Vitexin, targeting Hsp90 and hence restraining angiogenesis...
November 11, 2016: Medicinal Chemistry
https://www.readbyqxmd.com/read/27833636/hydrogen-sulfide-a-signal-molecule-in-plant-cross-adaptation
#18
REVIEW
Zhong-Guang Li, Xiong Min, Zhi-Hao Zhou
For a long time, hydrogen sulfide (H2S) has been considered as merely a toxic by product of cell metabolism, but nowadays is emerging as a novel gaseous signal molecule, which participates in seed germination, plant growth and development, as well as the acquisition of stress tolerance including cross-adaptation in plants. Cross-adaptation, widely existing in nature, is the phenomenon in which plants expose to a moderate stress can induce the resistance to other stresses. The mechanism of cross-adaptation is involved in a complex signal network consisting of many second messengers such as Ca(2+), abscisic acid, hydrogen peroxide and nitric oxide, as well as their crosstalk...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27830834/suilysin-induced-platelet-neutrophil-complexes-formation-is-triggered-by-pore-formation-dependent-calcium-influx
#19
Shengwei Zhang, Yuling Zheng, Shaolong Chen, Shujing Huang, Keke Liu, Qingyu Lv, Yongqiang Jiang, Yuan Yuan
Platelet activation and platelet-neutrophil interactions have been found to be involved in inflammation, organ failure and soft-tissue necrosis in bacterial infections. Streptococcus suis, an emerging human pathogen, can cause streptococcal toxic-shock syndrome (STSS) similarly to Streptococcus pyogenes. Currently, S. suis-platelet interactions are poorly understood. Here, we found that suilysin (SLY), the S. suis cholesterol-dependent cytolysin (CDC), was the sole stimulus of S. suis that induced platelet-neutrophil complexes (PNC) formation...
November 10, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27812635/staphylococcal-superantigen-specific-ige-antibodies-degree-of-sensitization-and-association-with-severity-of-asthma
#20
José Elabras, Fernanda Carvalho de Queiroz Mello, Omar Lupi, Blanca Elena Rios Gomes Bica, José Angelo de Souza Papi, Alfeu Tavares França
Objective: To determine the presence of staphylococcal superantigen-specific IgE antibodies and degree of IgE-mediated sensitization, as well as whether or not those are associated with the severity of asthma in adult patients. Methods: This was a cross-sectional study involving outpatients with asthma under treatment at a tertiary care university hospital in the city of Rio de Janeiro, Brazil. Consecutive patients were divided into two groups according to the severity of asthma based on the Global Initiative for Asthma criteria: mild asthma (MA), comprising patients with mild intermittent or persistent asthma; and moderate or severe asthma (MSA)...
September 2016: Jornal Brasileiro de Pneumologia: Publicaça̋o Oficial da Sociedade Brasileira de Pneumologia e Tisilogia
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