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https://www.readbyqxmd.com/read/28917804/development-and-validation-of-a-maleimide-based-enzyme-linked-immunosorbent-assay-for-the-detection-of-tetrodotoxin-in-oysters-and-mussels
#1
Laia Reverté, Maria Rambla-Alegre, Sandra Leonardo, Carlos Bellés, Katrina Campbell, Christopher T Elliott, Arjen Gerssen, Mirjam D Klijnstra, Jorge Diogène, Mònica Campàs
The recent detection of tetrodotoxins (TTXs) in puffer fish and shellfish in Europe highlights the necessity to monitor the levels of TTXs in seafood by rapid, specific, sensitive and reliable methods in order to protect human consumers. A previous immunoassay for TTX detection in puffer fish, based on the use of self-assembled monolayers (SAMs) for the immobilization of TTX on maleimide plates (mELISA), has been modified and adapted to the analysis of oyster and mussel samples. Changing dithiol for cysteamine-based SAMs enabled reductions in the assay time and cost, while maintaining the sensitivity of the assay...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28915947/immunosensor-array-platforms-based-on-self-assembled-dithiols-for-the-electrochemical-detection-of-tetrodotoxins-in-puffer-fish
#2
Laia Reverté, Katrina Campbell, Maria Rambla-Alegre, Christopher T Elliott, Jorge Diogène, Mònica Campàs
The recent detection of tetrodotoxins (TTXs) in European fish and shellfish has emphasized the urgent need to develop specific, selective, rapid and easy-to-use methods for their detection to assess the potential risk posed to human health. For this purpose, a dithiol self-assembled monolayer (SAM)-based immunoassay previously performed on maleimide plates (mELISA) has been adapted to gold electrode arrays for the development of an electrochemical immunosensor for TTX. The electrochemical SAM-based immunosensor designed herein, provided an oriented, stable and spaced sensing platform for the determination of TTX, attaining a limit of detection of 2...
October 9, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28882690/toxicogenomic-and-bioinformatics-platforms-to-identify-key-molecular-mechanisms-of-a-curcumin-analogue-dm-1-toxicity-in-melanoma-cells
#3
Érica Aparecida de Oliveira, Diogenes Saulo de Lima, Lucas Esteves Cardozo, Garcia Ferreira de Souza, Nayane de Souza, Debora Kristina Alves-Fernandes, Fernanda Faião-Flores, José Agustín Pablo Quincoces, Silvia Berlanga de Moraes Barros, Helder I Nakaya, Gisele Monteiro, Silvya Stuchi Maria-Engler
Melanoma is a highly invasive and metastatic cancer with high mortality rates and chemoresistance. Around 50% of melanomas are driven by activating mutations in BRAF that has led to the development of potent anti-BRAF inhibitors. However resistance to anti-BRAF therapy usually develops within a few months and consequently there is a need to identify alternative therapies that will bypass BRAF inhibitor resistance. The curcumin analogue DM-1 (sodium 4-[5-(4-hydroxy-3-methoxy-phenyl)-3-oxo-penta-1,4-dienyl]-2-methoxy-phenolate) has substantial anti-tumor activity in melanoma, but its mechanism of action remains unclear...
September 4, 2017: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/28878667/adaptive-pathways-possible-next-steps-for-payers-in-preparation-for-their-potential-implementation
#4
REVIEW
Patricia Vella Bonanno, Michael Ermisch, Brian Godman, Antony P Martin, Jesper Van Den Bergh, Liudmila Bezmelnitsyna, Anna Bucsics, Francis Arickx, Alexander Bybau, Tomasz Bochenek, Marc van de Casteele, Eduardo Diogene, Irene Eriksson, Jurij Fürst, Mohamed Gad, Ieva Greičiūtė-Kuprijanov, Martin van der Graaff, Jolanta Gulbinovic, Jan Jones, Roberta Joppi, Marija Kalaba, Ott Laius, Irene Langner, Ileana Mardare, Vanda Markovic-Pekovic, Einar Magnusson, Oyvind Melien, Dmitry O Meshkov, Guenka I Petrova, Gisbert Selke, Catherine Sermet, Steven Simoens, Ad Schuurman, Ricardo Ramos, Jorge Rodrigues, Corinne Zara, Eva Zebedin-Brandl, Alan Haycox
Medicines receiving a conditional marketing authorization through Medicines Adaptive Pathways to Patients (MAPPs) will be a challenge for payers. The "introduction" of MAPPs is already seen by the European Medicines Agency (EMA) as a fait accompli, with payers not consulted or involved. However, once medicines are approved through MAPPs, they will be evaluated for funding by payers through different activities. These include Health Technology Assessment (HTA) with often immature clinical data and high uncertainty, financial considerations, and negotiations through different types of agreements, which can require monitoring post launch...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28867577/biological-properties-of-cardiac-mesenchymal-stem-cells-in-rats-with-diabetic-cardiomyopathy
#5
Diógenes Rodrigo Maronezzi de Paula, Vanessa Capuano, Daniel Mendes Filho, Anna Cecília Dias Maciel Carneiro, Virgínia de Oliveira Crema, Lucas Felipe de Oliveira, Aldo Rogélis Aquiles Rodrigues, Nicola Montano, Valdo José Dias da Silva
Cardiomyopathy is a major outcome in patients with diabetes mellitus (DM) and contributes to the high morbidity/mortality observed in this disease. AIMS: To evaluate several biological properties of cardiac mesenchymal stem cells (cMSCs) in a rat model of streptozotocin-induced DM with concomitant diabetic cardiomyopathy. MAIN METHODS: After 10weeks of DM induction, diabetic and control rats were assessed using ECG and ventricular hemodynamics monitoring. Then, the hearts were excised and processed for histology and for extracting non-cardiomyocytic cells...
August 31, 2017: Life Sciences
https://www.readbyqxmd.com/read/28844309/microbial-modulation-of-stem-cells-and-future-directions-in-regenerative-endodontics
#6
Anibal Diogenes, Kenneth M Hargreaves
Regenerative endodontic procedures (REPs) have been shown to promote the resolution of signs and symptoms of disease and increase survival compared with traditional treatment procedures. However, there is still variable predictability of continued root development and evidence that the tissues formed do not recapitulate the native pulp-dentin complex. There is growing evidence that the apical papilla is capable of surviving prolonged endodontic infection and apical periodontitis and that it represents a rich source of undifferentiated mesenchymal stem cells in REPs...
September 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28843821/activity-of-2-quinolin-4-yloxy-acetamides-in-mycobacterium-tuberculosis-clinical-isolates-and-identification-of-their-molecular-target-by-whole-genome-sequencing
#7
Fernanda Teixeira Subtil, Anne Drumond Villela, Bruno Lopes Abbadi, Valnês S Rodrigues-Junior, Cristiano Valim Bizarro, Luis Fernando Saraiva Macedo Timmers, Osmar Norberto de Souza, Kenia Pissinate, Pablo Machado, Alexandre López-Gavín, Griselda Tudó, Julian González-Martín, Luiz Augusto Basso, Diógenes Santiago Santos
The 2-(quinolin-4-yloxy)acetamides (QOAs) have been reported as promising molecules for tuberculosis treatment. Recent studies demonstrated its potent antimycobacterial activity, as well as its biological stability and synergism with rifampicin. The identification of the molecular target is an essential step towards the development of a novel drug candidate. Here we report the target identification of the QOAs. We found that these compounds are active against isoniazid, rifampicin, ethambutol, streptomycin and ethionamide resistant clinical isolates from M...
August 23, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28840299/antimicrobial-and-antioxidant-activities-of-the-extract-and-fractions-of-tetradenia-riparia-hochst-codd-lamiaceae-leaves-from-brazil
#8
Ana Claudia A M Fernandez, Maurício F Rosa, Carla M M Fernandez, Wanessa C Bortolucci, Ulisses Z Melo, Vera L D Siqueira, Diógenes A G Cortez, José E Gonçalves, Giani A Linde, Zilda C Gazim
Tetradenia riparia (Lamiaceae) is native to Central Africa popularly known as myrrh, used in folk medicine to treat various diseases like malaria, gastroenteritis, and tropical skin disease. This research was to evaluate the antioxidant and antibacterial activities of the crude extract (CE) and fractions (FR) of the T. riparia by classical chromatography. The CE of T. riparia leaves was submitted to column chromatographic fractionation to obtain four fractions of the interest, which were identified by nuclear magnetic resonance and gas chromatograph coupled to mass spectrum: FR-I (abieta-7,9(11)-dien-13-β-ol), FR-II (Ibozol), FR-III (8 (14), 15-sandaracopimaradiene-2α, 18-diol and 8 (14), 15-sandaracopimaradiene-7α, 18-diol), and FR-IV (Astragalin, Boronolide and Luteolin)...
August 24, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28838610/toxicological-profile-of-iqg-607-after-single-and-repeated-oral-administration-in-minipigs-an-essential-step-towards-phase-i-clinical-trial
#9
Valnês S Rodrigues-Junior, Luciana Cintra, Pablo Machado, Adílio Dadda, Luiz Augusto Basso, Ana Carolina Cintra Nunes Mafra, Alexandre Holthausen Campos, Maria Martha Campos, Diógenes Santiago Santos
IQG-607 is an anti-tuberculosis drug candidate, with a promising safety and efficacy profile in models of tuberculosis infection both in vitro and in vivo. Here, we evaluated the safety and the possible toxic effects of IQG-607 after acute and 90-day repeated administrations in minipigs. Single oral administration of IQG-607 (220 mg/kg) to female and male minipigs did not result in any morbidity or mortality. No gross lesions were observed in the minipigs at necropsy. Repeated administration of IQG 607 (65, 30, or 15 mg/kg), given orally, for 90 days, in both male and female animals did not cause any mortality and no significant body mass alteration...
August 23, 2017: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/28811602/identification-of-ciguatoxins-in-a-shark-involved-in-a-fatal-food-poisoning-in-the-indian-ocean
#10
Jorge Diogène, Laia Reverté, Maria Rambla-Alegre, Vanessa Del Río, Pablo de la Iglesia, Mònica Campàs, Oscar Palacios, Cintia Flores, Josep Caixach, Christian Ralijaona, Iony Razanajatovo, Agathe Pirog, Hélène Magalon, Nathalie Arnich, Jean Turquet
Severe food poisoning events after the consumption of sharks have been reported since the 1940s; however, there has been no clear understanding of their cause. Herein, we report for the first time the presence of ciguatoxins (CTXs) in sharks. The identification by mass spectrometry of CTXs, including two new analogues, in a bull shark (Carcharhinus leucas) that was consumed by humans, causing the poisoning and death of 11 people in Madagascar in 2013 is described. Typical neurotoxic ciguatera symptoms were recorded in patients, and toxicological assays on extracts of the shark demonstrated CTX-like activity...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28790928/enhanced-right-chamber-remodeling-in-endurance-ultra-trail-athletes-compared-to-marathon-runners-detected-by-standard-and-speckle-tracking-echocardiography
#11
Kristian Ujka, Luca Bastiani, Gennaro D'Angelo, Bruna Catuzzo, Alessandro Tonacci, Simona Mrakic-Sposta, Alessandra Vezzoli, Guido Giardini, Lorenza Pratali
Background: Strenuous and endurance exercise training have been associated with morphological and functional heart remodeling. Two-dimensional speckle-tracking echocardiography (STE) is a novel technique that allows an accurate quantification of global myocardium deformation. Our aim was to evaluate together left and right cardiac remodeling in different long-distance running athletes: marathon runners (42 km) (M) and endurance mountain runners (>300 Km) (UT). Methods: A total of 92 athletes (70 males, 76%) including 47 M [age 45 ± 7 years; training: 18 (9-53) years(*)days/week], 45 UT [age 42 ± 9, training: 30 (15-66) years(*)days/week] underwent conventional echocardiography and STE (Beyond Diogenes 2...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28783592/the-efficiency-of-spermatogenesis-and-the-support-capacity-of-sertoli-cells-in-characiformes
#12
Maira da Silva Rodrigues, Diógenes Henrique de Siqueira-Silva, Patrícia Postingel Quirino, Alexandre Ninhaus-Silveira, Rosicleire Veríssimo-Silveira
This stereological analysis of the types of germ cells and the number of Sertoli cells per cyst in Astyanax altiparanae testes during spermatogenesis is the first such report in Characiformes. Testes of 25 male A. altiparanae were examined. Based on the number of spermatogonia B per cyst (469.2 ± 9.92), we estimated that spermatogonia undergo at least nine mitotic divisions before differentiating into primary spermatocytes. There are four spermatogonia types: undifferentiated spermatogonia A*, undifferentiated spermatogonia, differentiated spermatogonia, and type B spermatogonia...
November 2017: Theriogenology
https://www.readbyqxmd.com/read/28766472/stereological-analysis-of-gonads-from-diploid-and-triploid-fish-yellowtail-tetra-astyanax-altiparanae-garutti-britski-in-laboratory-conditions
#13
Nivaldo Ferreira do Nascimento, Diógenes Henrique de Siqueira-Silva, Matheus Pereira-Santos, Takafumi Fujimoto, José Augusto Senhorini, Laura Satiko Okada Nakaghi, George Shigueki Yasui
This study aimed to examine the gonadal morphology of diploid and triploid fish through stereological analysis. Triploid individuals were obtained after temperature shock (40°C for 2 min) at 2 min post-fertilization and reared until 175 days post-fertilization (dpf). Intact eggs were used to obtain the diploids. Gonads were collected for histological analysis at 83, 114, 144 and 175 dpf. Diploid females and males presented normal oogenesis and spermatogenesis through all the experimental period. Conversely, stereological analysis revealed that triploid females were sterile and oogonia were the prevalent cell type in the ovaries...
August 2, 2017: Zygote: the Biology of Gametes and Early Embryos
https://www.readbyqxmd.com/read/28757246/evaluation-of-mesenchymal-stem-cell-modulation-of-trigeminal-neuronal-responses-to-cold
#14
Michael A Eskander, Koyo Takimoto, Anibal Diogenes
Tissue engineering protocols, such as regenerative endodontic procedures (REPs), comprise biologically based procedures designed to restore normal physiologic function. For REPs, the goal is reconstitution of the pulp-dentin complex by delivering mesenchymal stem cells (MSCs), including the stem cells of the apical papilla (SCAP) into a root canal system. Many patients regain cold sensitivity after REPs, but the mechanism is not understood. We hypothesized that SCAP modulate nociceptive function through a paracrine mechanism that activates cold-sensitive ion channels in neurons...
July 27, 2017: Neuroscience
https://www.readbyqxmd.com/read/28754992/observed-crowding-effects-on-mycobacterium-tuberculosis-2-trans-enoyl-acp-coa-reductase-enzyme-activity-are-not-due-to-excluded-volume-only
#15
Mariane Rotta, Luis F S M Timmers, Carlos Sequeiros-Borja, Cristiano V Bizarro, Osmar N de Souza, Diogenes S Santos, Luiz A Basso
The cellular milieu is a complex and crowded aqueous solution. Macromolecular crowding effects are commonly studied in vitro using crowding agents. The aim of the present study was to evaluate the effects, if any, of macromolecular synthetic crowding agents on the apparent steady-state kinetic parameters (K m , k cat , and k cat /K m ) of Mycobacterium tuberculosis 2-trans-enoyl-ACP (CoA) reductase (InhA). Negligible effects on InhA activity were observed for ficoll 70, ficoll 400 and dextran 70. A complex effect was observed for PEG 6000...
July 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28726387/aryl-substituted-ruthenium-ii-complexes-a-strategy-for-enhanced-photocleavage-and-efficient-dna-binding
#16
Felipe Diógenes Abreu, Tercio de F Paulo, Marcelo H Gehlen, Rômulo A Ando, Luiz G F Lopes, Ana Cláudia S Gondim, Mayron A Vasconcelos, Edson H Teixeira, Eduardo Henrique Silva Sousa, Idalina Maria Moreira de Carvalho
Ruthenium polypyridine complexes have shown promise as agents for photodynamic therapy (PDT) and tools for molecular biology (chromophore-assisted light inactivation). To accomplish these tasks, it is important to have at least target selectivity and great reactive oxygen species (ROS) photogeneration: two properties that are not easily found in the same molecule. To prepare such new agents, we synthesized two new ruthenium complexes that combine an efficient DNA binding moiety (dppz ligand) together with naphthyl-modified (1) and anthracenyl-modified (2) bipyridine as a strong ROS generator bound to a ruthenium complex...
August 7, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28709705/phase-ii-trial-of-neoadjuvant-chemotherapy-followed-by-chemoradiation-in-locally-advanced-cervical-cancer
#17
Carla Rameri Alexandre Silva de Azevedo, Luiz Cláudio Santos Thuler, Maria Júlia Gonçalves de Mello, Jurema Telles de Oliveira Lima, Ana Luiza Fassizoli da Fonte, Diógenes Fernando Santos Fontão, Vandré Cabral Gomes Carneiro, Tien Man Cabral Chang, Carlos Gil Ferreira
OBJECTIVE: Cervical cancer is a global public health challenge. Since 1999, platin based chemoradiation (CRT) is the standard treatment for those patients with locally advanced disease. However, this population still has a dismal prognosis and, alternatives approaches such as adjuvant chemotherapy are controversial, especially because of increased toxicity. Neoadjuvant chemotherapy (NACT) could be an option for more intensive treatment with manageable toxicity. METHODS: A phase II, prospective, non-randomized trial was conducted at a reference center in Recife, Brazil...
September 2017: Gynecologic Oncology
https://www.readbyqxmd.com/read/28693884/the-flavonoid-rutin-modulates-microglial-macrophage-activation-to-a-cd150-cd206-m2-phenotype
#18
Alessandra Bispo da Silva, Paulo Lucas Cerqueira Coelho, Jessika Alves Oliveira Amparo, Monique Marylin Alves de Almeida Carneiro, Julita Maria Pereira Borges, Cleide Dos Santos Souza, Maria de Fátima Dias Costa, Miriam Mecha, Carmen Guaza Rodriguez, Victor Diogenes Amaral da Silva, Silvia Lima Costa
Rutin is a glycosylated flavonoid present in many fruits and plants that has been demonstrated to have anti-inflammatory and antioxidant properties. However, little is known about the mechanisms underlying microglial activation and its effects on the regulation of cytokines and chemokines associated with inflammatory responses in the central nervous system. In this study we examined the effect of rutin on resting or lipopolysaccharide (LPS)-stimulated microglia and characterized their modulation to an activated M1 phenotype or an alternatively activated M2 phenotype...
August 25, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28679551/pretreatment-fasting-plasma-glucose-and-insulin-modify-dietary-weight-loss-success-results-from-3-randomized-clinical-trials
#19
RANDOMIZED CONTROLLED TRIAL
Mads F Hjorth, Christian Ritz, Ellen E Blaak, Wim Hm Saris, Dominique Langin, Sanne Kellebjerg Poulsen, Thomas Meinert Larsen, Thorkild Ia Sørensen, Yishai Zohar, Arne Astrup
Background: Which diet is optimal for weight loss and maintenance remains controversial and implies that no diet fits all patients.Objective: We studied concentrations of fasting plasma glucose (FPG) and fasting insulin (FI) as prognostic markers for successful weight loss and maintenance through diets with different glycemic loads or different fiber and whole-grain content, assessed in 3 randomized trials of overweight participants.Design: After an 8-wk weight loss, participants in the DiOGenes (Diet, Obesity, and Genes) trial consumed ad libitum for 26 wk a diet with either a high or a low glycemic load...
August 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28673458/performance-endoparasitary-control-and-blood-values-of-ewes-locally-adapted-in-semiarid-region
#20
Josiel Borges Ferreira, Ana Carla Diógenes Suassuna Bezerra, Magda Maria Guilhermino, Jacinara Hody Gurgel Morais Leite, Wilma Emanuela da Silva, Renato Diógenes Macedo Paiva, Tallysson Nogueira Barbosa, José Ernandes Rufino de Sousa, Débora Andréa Evangelista Façanha
This study evaluated the variation in the prevalence of endoparasitoses and their impact on body condition and blood values of sheep of the Morada Nova breed. A total of 138 ewes were examined for their morphology (body weight, BW; body condition score, BCS), parasitology (faecal egg count, FEC; Famacha© score; coproculture), hematology (red blood cell count,RBC); hemoglobin concentration, HE; packet cell volume, PCV; mean corpuscular volume, MCV,; mean corpuscular hemoglobin, MCH; mean corpuscular hemoglobin concentration, MCHC; leukocytes, WBC) and serum biochemistry (glucose, cholesterol, triglycerides, urea, creatinine, total protein, albumin, globulin, AST and ALT)...
June 2017: Comparative Immunology, Microbiology and Infectious Diseases
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