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https://www.readbyqxmd.com/read/29140694/tyrocidine-a-analogues-bearing-the-planar-d-phe-2-abz-turn-motif-how-conformation-impacts-bioactivity
#1
Alan J Cameron, Patrick J B Edwards, Elena Harjes, Vijayalekshmi Sarojini
The D-Phe-Pro β-turn of the cyclic β-hairpin antimicrobial decapeptide Tyrocidine A, (Tyrc A) was substituted with the D-Phe-2-aminobenzoic acid (2-Abz) motif in a synthetic analogue (1). NMR structure of 1 demonstrated that compound 1 retained the β-hairpin structure of Tyrc A with additional planarity, resulting in approx. 30-fold reduced haemolysis than Tyrc A. Although antibacterial activity was partially compromised, a single Gln to Lys substitution (2) restored activity equivalent to Tyrc A against S...
November 15, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29123569/diagnostic-dilemma-severe-thrombotic-microangiopathy-in-pregnancy
#2
Sarah Birkhoelzer, Alexandra Belcher, Helen Peet
A diagnostic dilemma occurred when thrombotic microangiopathy developed during pregnancy. The diagnostic criteria of thrombotic microangiopathy include thrombocytopenia (platelets <100) and microangiopathic haemolytic anaemia (including thrombotic thrombocytopenic purpura and haemolytic-uraemic syndrome). An urgent interdisciplinary approach is required to treat thrombotic microangiopathy in pregnancy to differentiate between thrombotic microangiopathy and HELLP syndrome (haemolysis, elevated liver enzymes, low platelets)...
November 2017: J Intensive Care Soc
https://www.readbyqxmd.com/read/29118838/a-complex-obstetric-case
#3
Michael Hoy, Kate Flavin, Venkat Prasad
A 33-year-old primigravida presented with severe sepsis, severe pre-eclampsia, peripartum cardiomyopathy and the haemolysis, elevated liver enzymes and low platelets syndrome manifesting over the course of 24 h causing a diagnostic conundrum and a difficult sequence of physiological problems to overcome. We describe a previously unreported sequence of events involving a pre-eclamptic, septic parturient to improve anaesthetic and intensive care physician awareness of confounding factors that complicate assessment and management of these patients...
August 2017: J Intensive Care Soc
https://www.readbyqxmd.com/read/29114967/effect-of-intravenous-immunoglobulin-administration-on-erythrocyte-and-leukocyte-parameters
#4
A Cicha, M B Fischer, A Wesinger, S Haas, W M Bauer, H M Wolf, K M T Sauerwein, B Reininger, P Petzelbauer, H Pehamberger, A Handisurya
BACKGROUND: Intravenous immunoglobulins (IVIG) are an attractive therapeutic tool for therapy of toxic epidermal necrolysis and severe forms of certain autoimmune diseases, including dermatomyositis, autoimmune blistering diseases, systemic vasculitis, and lupus erythematodes. OBJECTIVE: Prompted by a case of IVIG-associated haemolytic anaemia, the effects of IVIG administrations on haematological parameters in patients with dermatological conditions were investigated...
November 8, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/29112170/psn-pc-a-novel-antimicrobial-and-anti-biofilm-peptide-from-the-skin-secretion-of-phyllomedusa-camba-with-cytotoxicity-on-human-lung-cancer-cell
#5
Xianhui Wu, Jinhuo Pan, Yue Wu, Xinping Xi, Chengbang Ma, Lei Wang, Mei Zhou, Tianbao Chen
Peptides derived from amphibian skin secretion are promising drug prototypes for combating widespread infection. In this study, a novel peptide belonging to the phylloseptin family of antimicrobial peptides was isolated from the skin secretion of the Phyllomedusa camba, namely phylloseptin-PC (PSN-PC). The biosynthetic precursor was obtained by molecular cloning and the mature peptide sequence was confirmed through tandem mass spectrometry (MS/MS) fragmentation sequencing in the skin secretion. The synthetic replicate exhibited a broad spectrum antimicrobial activity against Staphylococcus aureus, methicillin-resistant Staphylococcus aureus,Escherichia coli, Pseudomonas aeruginosa, Candida albicans at concentrations of 2, 2, 8, 32 and 2 µM, respectively...
November 7, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29107137/a-novel-iron-supplements-preparation-from-grifola-frondosa-polysaccharide-and-assessment-of-antioxidant-lymphocyte-proliferation-and-complement-fixing-activities
#6
Lei Xu, Yongbin Meng, Ying Liu, Qinghuan Meng, Zidong Zhang, Jian Li, Qi Lu
Grifola frondosa polysaccharide-iron (III) complex (GFP-iron) was synthesized and characterized. Based on single factor and orthogonal optimization experiments of GFP-iron (III) complex synthesis, the optimum conditions were the reaction temperature 80°C, pH 8, reaction time 90min and ratio of catalyst to GFP 1:1.0 gg(-1). The iron content of GFP-iron (III) complex reached 24.15% under the optimums and characterized by fourier transform infrared (FTIR), scanning electron microscopy (SEM), X-Ray Diffraction (XRD), thermogravimetry (TG) and iron release in vitro assay...
October 26, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29101578/biosurfactant-production-by-yeasts-isolated-from-hydrocarbon-polluted-environments
#7
Kamalpreet Kaur, Seema Sangwan, Harpreet Kaur
Thirty-two yeast isolates were retrieved from four soil samples collected from hydrocarbon-polluted locations of Hisar, Haryana, using enrichment culture technique with 1% (v/v) diesel as carbon source. Total nine isolates showing blood agar haemolysis were screened further for biosurfactant production. Yeast isolate, YK32, gave highest 8.4-cm oil displacement which was found to be significantly higher as compared to positive control, 0.2% (w/v) SDS (6.6 cm), followed by 6.2 and 6.0 cm by isolates YK20 and YK21, respectively...
November 3, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29100558/immunohaematological-complications-in-patients-with-sickle-cell-disease-after-haemopoietic-progenitor-cell-transplantation-a-prospective-single-centre-observational-study
#8
Elizabeth S Allen, Kshitij Srivastava, Matthew M Hsieh, Courtney D Fitzhugh, Harvey G Klein, John F Tisdale, Willy A Flegel
BACKGROUND: Haemopoietic progenitor cell (HPC) transplantation can cure sickle cell disease. Non-myeloablative conditioning typically results in donor-derived erythrocytes and stable mixed chimerism of recipient-derived and donor-derived leucocytes. Exposure to donor antigens from the HPC graft and new red cell antibodies induced by transfusion can lead to immunohaematological complications. We assessed the incidence of such complications among HPC transplant recipients with sickle cell disease...
November 2017: Lancet Haematology
https://www.readbyqxmd.com/read/29082022/systematic-review-of-the-clinical-manifestations-of-glucose-6-phosphate-dehydrogenase-deficiency-in-the-greater-mekong-subregion-implications-for-malaria-elimination-and-beyond
#9
Ken Ing Cherng Ong, Hodaka Kosugi, Sophea Thoeun, Hitomi Araki, Moe Moe Thandar, Moritoshi Iwagami, Bouasy Hongvanthong, Paul T Brey, Shigeyuki Kano, Masamine Jimba
INTRODUCTION: To achieve malaria elimination in the Greater Mekong Subregion (GMS) by 2030, proper case management is necessary. 8-aminoquinolines, such as primaquine, are the only available medicines effective in preventing relapse of the hypnozoite stage of Plasmodium vivax, as well as the onward transmission of Plasmodium falciparum. However, primaquine can cause haemolysis in individuals who have glucose-6-phosphate dehydrogenase deficiency (G6PDd). We conducted a systematic review on the reported clinical manifestations of G6PDd to provide a comprehensive overview of the situation in the GMS...
2017: BMJ Global Health
https://www.readbyqxmd.com/read/29076707/evaluation-of-probiotic-attributes-of-lactobacillus-sp-isolated-from-cow-and-buffalo-curd-samples-collected-from-kandy
#10
M F Shuhadha, G J Panagoda, T Madhujith, N W Jayawardana
Introduction: Curd is a potential source of probiotic Lactobacillus species. Methods: This study was carried out to isolate and characterise Lactobacillus species available in curd samples sold in the market. Nine curd samples prepared using cow or buffalo milk were obtained from a local market in the Kandy district. Results: Seven isolates (LB 1-7) were identified based on their colony morphology and biochemical characteristics and evaluated for probiotic attributes such as low pH tolerance, resistance to bile salts, antimicrobial activity against Escherichia coli and Pseudomonas aeruginosa, antibiotic activity against erythromycin, chloramphenicol and norfloxacin, haemolytic activity and DNase activity...
September 30, 2017: Ceylon Medical Journal
https://www.readbyqxmd.com/read/29066655/acute-hepatitis-b-virus-infection-and-severe-non-immune-haemolytic-anaemia-a-rare-relationship
#11
Inês Furtado, Diana Valadares, Filipe Gaio Nery
The clinical presentation of acute hepatitis B virus (HBV) infection is usually related to the onset of liver failure and damage. Anaemia may occur, but it is only rarely attributed to haemolysis. The authors report about the case of a 41-year-old woman with the diagnosis of acute HBV infection and coagulopathy (without encephalopathy) who developed non-immune haemolytic anaemia. Total recovery of the analytical liver profile, coagulopathy and anaemia was achieved through treatment targeting HBV.This case shows that, although rare, non-immune haemolytic anaemia may occur in association with acute HBV infection and that HBV suppression seems to lead to progressive anaemia resolution...
October 24, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/29065882/frequency-of-g6pd-mediterranean-in-individuals-with-and-without-malaria-in-southern-pakistan
#12
Bushra Moiz, Haroon Muhammad Arshad, Ahmed Raheem, Hasan Hayat, Najia Karim Ghanchi, M Asim Beg
BACKGROUND: Pakistan has an estimated annual burden of 1.5 million malaria cases. The current situation calls for an effective malaria control and eradication programme in this country. Currently, primaquine is an attractive option for eliminating reservoirs of Plasmodium vivax hypnozoites and killing gametocytes of Plasmodium falciparum. However, this drug causes haemolysis in individuals who are glucose-6-phosphate (G6PD) deficient. It is important to map G6PD deficiency and malaria distribution in Pakistan to design an effective malaria eradication regimen...
October 24, 2017: Malaria Journal
https://www.readbyqxmd.com/read/29051313/anaemia-in-pet-rabbits-causes-severity-and-reticulocyte-response
#13
Alexandra Dettweiler, Robert Klopfleisch, Kerstin Müller
The objective of the study was to determine the causes and the severity of anaemia in pet rabbits (Oryctolagus cuniculus), to classify anaemia and to compare the reticulocyte counts from healthy and anaemic rabbits. Over a time period of 11 years (2000-2011) a retrospective and prospective study of 223 pet rabbits was performed. Based on the clinic's own reference range for healthy pet rabbits (packed cell volume [PCV] levels 0.33-0.45 l/l), animals with a PCV level below 0.33 l/l were considered anaemic...
October 19, 2017: Veterinary Record
https://www.readbyqxmd.com/read/29045386/mfsd2b-is-essential-for-the-sphingosine-1-phosphate-export-in-erythrocytes-and-platelets
#14
Thiet M Vu, Ayako-Nakamura Ishizu, Juat Chin Foo, Xiu Ru Toh, Fangyu Zhang, Ding Ming Whee, Federico Torta, Amaury Cazenave-Gassiot, Takayoshi Matsumura, Sangho Kim, Sue-Anne E S Toh, Toshio Suda, David L Silver, Markus R Wenk, Long N Nguyen
Sphingosine-1-phosphate (S1P), a potent signalling lipid secreted by red blood cells and platelets, plays numerous biologically significant roles. However, the identity of its long-sought exporter is enigmatic. Here we show that the major facilitator superfamily transporter 2b (Mfsd2b), an orphan transporter, is essential for S1P export from red blood cells and platelets. Comprehensive lipidomic analysis indicates a dramatic and specific accumulation of S1P species in Mfsd2b knockout red blood cells and platelets compared with that of wild-type controls...
October 26, 2017: Nature
https://www.readbyqxmd.com/read/29021143/cold-agglutinins-in-a-patient-undergoing-normothermic-cardiac-operation-with-warm-cardioplegia
#15
Tatsuhiko Ogawa
Cold agglutinins are autoantibodies that agglutinate red blood cells at low temperatures, leading to haemagglutination and haemolysis. They are generally of no clinical significance. However, when people with cold agglutinins undergo cardiac operation with hypothermia and cold cardioplegia, they can experience complications. Thus, different perioperative management is required for such patients. We describe a 74-year-old man with cold agglutinins incidentally detected on the preoperative screening test. He had never experienced any complications or developed a haematological disease...
October 10, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/29017554/in-vivo-anti-malarial-activity-and-toxicity-studies-of-triterpenic-esters-isolated-form-keetia-leucantha-and-crude-extracts
#16
Claire Beaufay, Marie-France Hérent, Joëlle Quetin-Leclercq, Joanne Bero
BACKGROUND: Considering the need for new anti-malarial drugs, further investigations on Keetia leucantha (Rubiaceae), an in vitro antiplasmodial plant traditionally used to treat malaria, were carried out. This paper aimed to assess the in vivo anti-malarial efficacy of K. leucantha triterpenic esters previously identified as the most in vitro active components against Plasmodium falciparum and their potential toxicity as well as those of anti-malarial extracts. RESULTS: These eight triterpenic esters and the major antiplasmodial triterpenic acids, ursolic and oleanolic acids, were quantified in the twigs dichloromethane extract by validated HPLC-UV methods...
October 10, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28993349/aspirin-safety-in-glucose-6-phosphate-dehydrogenase-deficiency-patients-with-acute-coronary-syndrome-undergoing-percutaneous-coronary-intervention
#17
Julien Feghaly, Abdul Rahman Al Hout, Mattew Mercieca Balbi
The use of aspirin, as part of a dual antiplatelet therapy regimen, is an established standard following coronary stenting in patients suffering from acute coronary syndrome (ACS). However, in glucose-6-phosphate dehydrogenase (G6PD) deficient patients, precaution is always taken with aspirin use, due to the risk of haemolysis. We reviewed all previous cases of G6PD deficient patients with ACS, in addition to a review of the available literature, to better understand the safety of aspirin use in this population...
October 9, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28986730/acute-hantavirus-infection-presenting-as-haemolytic-uraemic-syndrome-hus-the-importance-of-early-clinical-diagnosis
#18
J Clement, A P K Lee, G A Verpooten, L Laenen, V Vergote, H De Samblanx, Z N Berneman, M Van Ranst, P Maes
The European prototype of hantavirus, Puumala virus (PUUV), isolated from a common wild rodent, the bank vole (Myodes glareolus), causes nephropathia epidemica (NE). NE can perfectly mimic haemolytic-uraemic syndrome (HUS), progressing from an aspecific flu-like syndrome to acute kidney injury with thrombocytopaenia, and presenting with some signs of haemolytic anaemia and/or coagulopathy. Moreover, both NE and HUS can occur in local outbreaks. We report an isolated case of NE, initially referred for plasmapheresis for suspected HUS, although signs of overt haemolysis were lacking...
October 6, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28979559/clostridium-perfringens-sepsis-complicated-by-right-ventricular-cardiogenic-shock
#19
Cosmin Balan, Graham Barker, David Garry
Clostridium perfringens sepsis has been ascribed a dismal prognosis when associated with massive intravascular haemolysis. We present a 71-year-old woman's fatal case which was compounded by isolated right ventricular cardiogenic shock. In this context, combined use of transthoracic echocardiography and pulmonary artery catheter monitoring is able to yield an individualized hemodynamic resuscitation. We discuss key aspects related to right and left heart mechanical efficiency, hypothesize as to the pulmonary hypertension mechanism of our case and set to emphasize a physiologically based framework for right ventricular failure hemodynamic management...
May 2017: J Intensive Care Soc
https://www.readbyqxmd.com/read/28969191/an-attempt-to-make-platelet-rich-fibrin-from-bone-marrow-aspirate
#20
Soh Nishimoto, Kazutoshi Fujita, Toshihiro Fujiwara, Yohei Sotsuka, Maki Tonooka, Hisako Ishise, Kenichiro Kawai, Masao Kakibuchi
INTRODUCTION: Platelet Rich Fibrin (PRF) was developed as a new generation of platelet concentration from peripheral blood. Method to make PRF is simple. It is easy to handle with its moderate firmness. Histologically, platelets and nucleated cells are packed along the yellow-red border. Bone marrow aspirate contains bone marrow cells that potentially work for tissue regeneration, and platelets which contain growth factors. The specific gravities of them are comparable. It implies that, if it is possible to make PRF from bone marrow aspirate, then high concentration of platelets and bone marrow cells can be obtained simultaneously by taking out yellow-red interface of it...
August 2017: Journal of Clinical and Diagnostic Research: JCDR
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