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https://www.readbyqxmd.com/read/28721850/amphotericin-b-induces-apoptosis-like-programmed-cell-death-in-naegleria-fowleri-and-naegleria-gruberi
#1
Roberto Cárdenas-Zúñiga, Angélica Silva-Olivares, José D' Artagnan Villalba-Magdaleno, Virginia Sánchez-Monroy, Jesús Serrano-Luna, Mineko Shibayama
Naegleria fowleri and Naegleria gruberi belong to the free-living amoebae group. It is widely known that the non-pathogenic species N. gruberi is usually employed as a model to describe molecular pathways in this genus, mainly because its genome has been recently described. However, N. fowleri is an aetiological agent of primary amoebic meningoencephalitis, an acute and fatal disease. Currently, the most widely used drug for its treatment is amphotericin B (AmB). It was previously reported that AmB has an amoebicidal effect in both N...
July 18, 2017: Microbiology
https://www.readbyqxmd.com/read/28721440/selectivity-of-plasma-membrane-calcium-atpase-pmca-mediated-extrusion-of-toxic-divalent-cations-in-vitro-and-in-cultured-cells
#2
Mariela S Ferreira-Gomes, Irene C Mangialavori, Mallku Q Ontiveros, Debora E Rinaldi, Jorge Martiarena, Sandra V Verstraeten, Juan Pablo F C Rossi
In the recent years, the toxicity of certain divalent cations has been associated with the alteration of intracellular Ca(2+) homeostasis. Among other mechanisms, these cations may affect the functionality of certain Ca(2+)-binding proteins and/or Ca(2+) pumps. The plasma membrane calcium pump (PMCA) maintains Ca(2+) homeostasis in eukaryotic cells by mediating the efflux of this cation in a process coupled to ATP hydrolysis. The aim of this work was to investigate both in vitro and in cultured cells if other divalent cations (Sr(2+), Ba(2+), Co(2+), Cd(2+), Pb(2+) or Be(2+)) could be transported by PMCA...
July 18, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/28719860/liposome-modified-titanium-surface-a-strategy-to-locally-deliver-bioactive-molecules
#3
Vincenzo De Leo, Monica Mattioli-Belmonte, Maria Teresa Cimmarusti, Annamaria Panniello, Manuela Dicarlo, Francesco Milano, Angela Agostiano, Elvira De Giglio, Lucia Catucci
Titanium and its alloys are widely employed materials for implants in orthopedic or dental surgery due to their mechanical properties, resistance to corrosion and osseointegration capability. However adverse reactions at the tissue/implant interface may occur, which limit the success of the osseointegration process. Therefore, different strategies have to be used to overcome these drawbacks. In this work, we developed two different liposome-based coatings on titanium surfaces as drug or bioactive molecule deposits for dental/orthopedic implant applications...
July 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28718695/enhanced-procoagulant-activity-of-platelets-after-chemotherapy-in-non-small-cell-lung-cancer
#4
Ruishuang Ma, Yayan Bi, Junjie Kou, Jin Zhou, Jialan Shi
The procoagulant status of patients with non-small cell lung cancer (NSCLC) after chemotherapy is poorly characterized and the role of platelets in hypercoagulative state of NSCLC is unknown. The aim of this study was to evaluate the procoagulant activity (PCA) of platelets in NSCLC before and after chemotherapy. The subjects were 52 patients newly diagnosed with NSCLC. The patients had decreased clotting time compared with healthy subjects, and the thrombin-antithrombin complex increased 2.5 fold after chemotherapy...
July 18, 2017: Cancer Biology & Therapy
https://www.readbyqxmd.com/read/28717145/acetylsalicylic-acid-differentially-limits-the-activation-and-expression-of-cell-death-markers-in-human-platelets-exposed-to-staphylococcus-aureus-strains
#5
Adrien Chabert, Pauline Damien, Paul O Verhoeven, Florence Grattard, Philippe Berthelot, Fabrice Zeni, Laurence Panicot-Dubois, Stéphane Robert, Françoise Dignat-George, Marie-Ange Eyraud, Bruno Pozzetto, Bernard Payrastre, Fabrice Cognasse, Olivier Garraud, Hind Hamzeh-Cognasse
Beyond their hemostatic functions, platelets alter their inflammatory response according to the bacterial stimulus. Staphylococcus aureus is associated with exacerbated inflammation and thrombocytopenia, which is associated with poor prognosis during sepsis. Acetylsalicylic acid and statins prevent platelet aggregation and decrease the mortality rate during sepsis. Therefore, we assessed whether these two molecules could reduce in vitro platelet activation and the inflammatory response to S. aureus. Platelets were exposed to clinical strains of S...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28717005/lipid-oxidation-inactivates-the-anticoagulant-function-of-protein-z-dependent-protease-inhibitor-zpi
#6
Xin Huang, Baoxin Liu, Yidong Wei, Ryan Beyea, Han Yan, Steven T Olson
Lipid oxidation due to oxidative stress plays an important role in the pathogenesis of inflammatory and thrombotic cardiovascular diseases. Several findings suggest that lipid peroxidation can alter the function of coagulation proteins and contribute to a hypercoagulable state, but the molecular mechanisms are unclear. Here, we report that oxidized phospholipids suppress the anticoagulant function of the serpin, protein Z-dependent protease inhibitor (ZPI), a specific inhibitor of membrane-associated factor Xa (FXa) that requires protein Z (PZ), phospholipid and calcium as cofactors...
July 17, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28711010/the-paralytic-shellfish-toxin-saxitoxin-enters-the-cytoplasm-and-induces-apoptosis-of-oyster-immune-cells-through-a-caspase-dependent-pathway
#7
Celina Abi-Khalil, Darren S Finkelstein, Genevieve Conejero, Justin Du Bois, Delphine Destoumieux-Garzon, Jean Luc Rolland
Exposure of the toxin-producing dinoflagellate Alexandrium catenella (A. catenella) was previously demonstrated to cause apoptosis of hemocytes in the oyster species Crassostrea gigas. In this work, a coumarin-labeled saxitoxin appeared to spread throughout the cytoplasm of the hemocytes. PSTs, including saxitoxin, were also shown to be directly responsible for inducing apoptosis in hemocytes, a process dependent on caspase activation and independent of reactive oxygen species (ROS) production. A series of in vitro labelling and microscopy experiments revealed that STX and analogs there of induced nuclear condensation, phosphatidylserine exposure, membrane permeability, and DNA fragmentation of hemocytes...
July 8, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28710753/fluorochrome-labeled-inhibitors-of-caspases-expedient-in-vitro-and-in-vivo-markers-of-apoptotic-cells-for-rapid-cytometric-analysis
#8
Zbigniew Darzynkiewicz, Hong Zhao, H Dorota Halicka, Piotr Pozarowski, Brian Lee
Activation of caspases is a characteristic event of apoptosis. Various cytometric methods distinguishing this event have been developed to serve as specific apoptotic markers for the assessment of apoptotic frequency within different cell populations. The method described in this chapter utilizes fluorochrome labeled inhibitors of caspases (FLICA) and is applicable to fluorescence microscopy, flow- and imaging-cytometry as well as to confocal imaging. Cell-permeant FLICA reagents tagged with carboxyfluorescein or sulforhodamine, when applied to live cells in vitro or in vivo, exclusively label the cells that are undergoing apoptosis...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28708497/freezing-dog-semen-using%C3%A2-80%C3%A2-%C3%A2-c-ultra-freezer-sperm-function-and-in%C3%A2-vivo-fertility
#9
F Pezo, C Cheuquemán, P Salinas, J Risopatrón
Long term storage of canine frozen semen is conventionally performed in liquid nitrogen (LN2). However, previous works in freezing canine semen using a -80 °C ultra-freezer (-80°C-UF) showed no differences on sperm quality after thawing. The main objective of this study was to compare the effects of the freezing techniques using LN2 or -80°C-UF on sperm function and in vivo fertility of frozen-thawed dog semen. The sperm-rich fraction of the ejaculate was collected separately from five Chihuahua breed, and each one divided into two aliquots, and frozen and stored in LN2 or -80°C-UF...
May 7, 2017: Theriogenology
https://www.readbyqxmd.com/read/28704658/fusion-stage-of-hiv-1-entry-depends-on-virus-induced-cell-surface-exposure-of-phosphatidylserine
#10
Elena Zaitseva, Eugene Zaitsev, Kamran Melikov, Anush Arakelyan, Mariana Marin, Rafael Villasmil, Leonid B Margolis, Gregory B Melikyan, Leonid V Chernomordik
HIV-1 entry into host cells starts with interactions between the viral envelope glycoprotein (Env) and cellular CD4 receptors and coreceptors. Previous work has suggested that efficient HIV entry also depends on intracellular signaling, but this remains controversial. Here we report that formation of the pre-fusion Env-CD4-coreceptor complexes triggers non-apoptotic cell surface exposure of the membrane lipid phosphatidylserine (PS). HIV-1-induced PS redistribution depends on Ca(2+) signaling triggered by Env-coreceptor interactions and involves the lipid scramblase TMEM16F...
July 12, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28704406/ftir-spectroscopy-of-whole-cells-for-the-monitoring-of-yeast-apoptosis-mediated-by-p53-over-expression-and-its-suppression-by-nigella-sativa-extracts
#11
Wafa Mihoubi, Emna Sahli, Ali Gargouri, Caroline Amiel
p53 over expression in yeast results in cell death with typical markers of apoptosis such as DNA fragmentation and phosphatidylserine externalization. We aimed to substitute/supplement classical fluorescent techniques (TUNEL, Annexin V, ROS detection) usually used to detect biochemical changes occurring during yeast apoptosis mediated by p53 over expression and the effect of anti-apoptotic purified molecules from Nigel (Nigella sativa) extracts on these same yeasts by the label free technique of FTIR spectroscopy...
2017: PloS One
https://www.readbyqxmd.com/read/28698592/monitoring-changes-of-docosahexaenoic-acid-containing-lipids-during-the-recovery-process-of-traumatic-brain-injury-in-rat-using-mass-spectrometry-imaging
#12
Shuai Guo, Dan Zhou, Mo Zhang, Tiejun Li, Yujie Liu, Yupin Xu, Tianjing Chen, Zhili Li
Brain lipid homoeostasis is critical during recovery process after traumatic brain injury (TBI). In this study, we integrated liquid extraction and electrosonic spray ionization technology to develop an ionization device coupled with a Fourier transform ion cyclotron resonance mass spectrometer for imaging of docosahexaenoic acid (DHA)-containing lipids on rat brain tissues. The ion images of the brain tissue sections from the normal rats and the rats after TBI at acute phase (0 and 1 day) and chronic phase (3, 5, and 7 days) were obtained...
July 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28698403/identifying-mitotane-induced-mitochondria-associated-membranes-dysfunctions-metabolomic-and-lipidomic-approaches
#13
Ségolène Hescot, Larbi Amazit, Marie Lhomme, Simon Travers, Anais DuBow, Stéphanie Battini, Geoffrey Boulate, Izzie Jacques Namer, Anne Lombès, Anatol Kontush, Alessio Imperiale, Eric Baudin, Marc Lombès
Mitotane (o,p'DDD), the most effective drug in adrenocortical carcinoma, concentrates into the mitochondria and impacts mitochondrial functions. To address the molecular mechanisms of mitotane action and to identify its potential target, metabolomic and lipidomic approaches as well as imaging analyses were employed in human adrenocortical H295R cells allowing identification of Mitochondria-Associated Membranes dysfunction as a critical impact of mitotane. Study of intracellular energetic metabolites by NMR spectroscopy showed that mitotane significantly decreased aspartate while concomitantly increased glutamate content in a time- and concentration-dependent manner...
July 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28698382/phosphatidylserine-dictates-the-assembly-and-dynamics-of-caveolae-in-the-plasma-membrane
#14
Takashi Hirama, Raibatak Das, Yanbo Yang, Charles Ferguson, Amy Won, Christopher M Yip, Jason G Kay, Sergio Grinstein, Robert G Parton, Gregory D Fairn
Caveolae are bulb-shaped nanodomains of the plasma membrane that are enriched in cholesterol and sphingolipids. They have many physiological functions, including endocytic transport, mechanosensing, and regulation of membrane and lipid transport. Caveola formation relies on integral membrane proteins termed caveolins (CAVs) and the cavin family of peripheral proteins. Both protein families bind anionic phospholipids, but the precise roles of these lipids are unknown. Here, we studied the effects of phosphatidylserine (PtdSer), phosphatidylinositol 4-phosphate (PtdIns4P), and phosphatidylinositol 4,5-bisphosphate (PtdIns4,5P2) on caveolar formation and dynamics...
July 11, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28694452/phosphatidylserine-mediated-platelet-clearance-by-endothelium-decreases-platelet-aggregates-and-procoagulant-activity-in-sepsis
#15
Ruishuang Ma, Rui Xie, Chengyuan Yu, Yu Si, Xiaoming Wu, Lu Zhao, Zhipeng Yao, Shaohong Fang, He Chen, Valerie Novakovic, Chunyan Gao, Junjie Kou, Yayan Bi, Hemant S Thatte, Bo Yu, Shufen Yang, Jin Zhou, Jialan Shi
The mechanisms that eliminate activated platelets in inflammation-induced disseminated intravascular coagulation (DIC) in micro-capillary circulation are poorly understood. This study explored an alternate pathway for platelet disposal mediated by endothelial cells (ECs) through phosphatidylserine (PS) and examined the effect of platelet clearance on procoagulant activity (PCA) in sepsis. Platelets in septic patients demonstrated increased levels of surface activation markers and apoptotic vesicle formation, and also formed aggregates with leukocytes...
July 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28693022/temsirolimus-sensitive-stimulation-of-platelet-activity-apoptosis-and-aggregation-by-collagen-related-peptide
#16
Hang Cao, Rosi Bissinger, Anja T Umbach, Meinrad Gawaz, Florian Lang
BACKGROUND/AIMS: The mammalian target of rapamycin (mTOR) inhibitor temsirolimus stimulates apoptosis of tumor cells and is thus therapeutically used for the treatment of diverse malignancies. On the other hand, temsirolimus has been shown to protect against apoptosis of hippocampal neurons. Similar to nucleated cells, blood platelets may enter suicidal death characterized by cell shrinkage and cell membrane scrambling. Platelet apoptosis is frequently preceded by Ca2+ entry, degranulation, integrin activation and stimulation of caspases...
July 11, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28689275/neuroprotective-effects-of-n-3-polyunsaturated-fatty-acid-enriched-phosphatidylserine-against-oxidative-damage-in-pc12-cells
#17
Hongxia Che, Xueyuan Fu, Lingyu Zhang, Xiang Gao, Min Wen, Lei Du, Changhu Xue, Jie Xu, Yuming Wang
Neurodegenerative diseases are defined by progressive loss of specific neuronal cell populations and are associated with protein aggregates. Oxidative stress has been implicated in their pathological processes. Previous studies revealed that docosahexaenoic acid (DHA) is beneficial in neurodegenerative diseases. Phospholipids (PLs) derived from marine products are rich in DHA and eicosapentaenoic acid (EPA). In the present study, we investigated the neuroprotective effects of DHA-enriched and unenriched phosphatidylcholine (PC) and phosphatidylserine (PS) on oxidative stress induced by hydrogen peroxide (H2O2) and tert-butylhydroperoxide in PC12 cells...
July 8, 2017: Cellular and Molecular Neurobiology
https://www.readbyqxmd.com/read/28688277/synthesis-antitumor-activity-and-cdk1-inhibiton-of-new-thiazole-nortopsentin-analogues
#18
Barbara Parrino, Alessandro Attanzio, Virginia Spanò, Stella Cascioferro, Alessandra Montalbano, Paola Barraja, Luisa Tesoriere, Patrizia Diana, Girolamo Cirrincione, Anna Carbone
A new series of thiazole nortopsentin analogues was conveniently synthesized with fair overall yields. The antiproliferative activity of the new derivatives was tested against different human tumor cell lines of the NCI full panel. Four of them showed good antitumor activity with GI50 values from micro to nanomolar level. The mechanism of the antiproliferative effect of these derivatives, was pro-apoptotic, being associated with externalization of plasma membrane phosphatidylserine and DNA fragmentation. The most active and selective of the new thiazoles confined viable cells in G2/M phase and markedly inhibited in vitro CDK1 activity...
June 27, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28686816/first-line-non-criterial-antiphospholipid-antibody-testing-for-the-diagnosis-of-antiphospholipid-syndrome-in-clinical-practice-a-combination-of-anti-beta2-glycoprotein-i-domain-i-and-phosphatidylserine-dependent-antiprothrombin-antibodies
#19
Hiroyuki Nakamura, Kenji Oku, Olga Amengual, Kazumasa Ohmura, Yuichiro Fujieda, Masaru Kato, Toshiyuki Bohgaki, Shinsuke Yasuda, Tatsuya Atsumi
OBJECTIVE: The aim of this study was to assess the value of a combination of anti-beta2-glycoprotein I domain I antibodies (aDI) and phosphatidylserine-dependent antiprothrombin antibodies (aPS/PT) tests for the diagnosis of antiphospholipid syndrome (APS). METHODS: This cross-sectional study involved a cohort of the patients who visited our clinic from April 2005 to March 2013. IgG aDI, IgG aPS/PT, and IgM aPS/PT tests, together with criteria-defined antiphospholipid antibodies (aPL) tests, were performed in all patients...
July 7, 2017: Arthritis Care & Research
https://www.readbyqxmd.com/read/28686152/washing-in-hypotonic-saline-reduces-the-fraction-of-irreversibly-damaged-cells-in-stored-blood-a-proof-of-concept-study
#20
Hui Xia, Grishma Khanal, Briony C Strachan, Eszter Vörös, Nathaniel Z Piety, Sean C Gifford, Sergey S Shevkoplyas
BACKGROUND: During hypothermic storage, a substantial fraction of red blood cells (RBCs) transforms from flexible discocytes to rigid sphero-echinocytes and spherocytes. Infusion of these irreversibly-damaged cells into the recipient during transfusion serves no therapeutic purpose and may contribute to adverse outcomes in some patients. In this proof-of-concept study we describe the use of hypotonic washing for selective removal of the irreversibly-damaged cells from stored blood. MATERIALS AND METHODS: Stored RBCs were mixed with saline of various concentrations to identify optimal concentration for inducing osmotic swelling and selective bursting of spherical cells (sphero-echinocytes, spherocytes), while minimising indiscriminate lysis of other RBCs...
May 11, 2017: Blood Transfusion, Trasfusione del Sangue
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