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https://www.readbyqxmd.com/read/29775562/rapid-quantification-of-vesicle-concentration-for-dopg-dopc-and-cardiolipin-dopc-mixed-lipid-systems-of-variable-composition
#1
Margaret M Elmer-Dixon, Bruce E Bowler
A novel approach to quantify mixed lipid systems is described. Traditional approaches to lipid vesicle quantification are time consuming, require large amounts of material and are destructive. We extend our recently described method for quantification of pure lipid systems to mixed lipid systems. The method only requires a UV-Vis spectrometer and does not destroy sample. Mie scattering data from absorbance measurements are used as input into a Matlab program to calculate the total vesicle concentration and the concentrations of each lipid in the mixed lipid system...
May 15, 2018: Analytical Biochemistry
https://www.readbyqxmd.com/read/29756580/subtypes-of-antiphospholipid-antibodies-in-neurologic-accidents-an-observational-study
#2
Maryam Sahebari, Maryam Rastin, Reza Boostani, Mohsen Forughipour, Kamila Hashemzadeh, Samira HaajSadeghi
OBJECTIVE: Until now, concomitant neurological manifestations and positive antiphospholipid antibodies (APA(s)) have been investigated in different manners. The most important conflicts in this field are whether those manifestations are directly related to APA(s) or not and treatment strategies. METHOD: In this study, adopting a different manner, we selected patients with a recently defined neurological problem (according to study protocol) and positive APA without any other risk factor, to compare types, amounts, and titer of APAs...
May 14, 2018: Current Rheumatology Reviews
https://www.readbyqxmd.com/read/29748546/nutrient-depletion-induced-production-of-tri-acylated-glycerophospholipids-in-acinetobacter-radioresistens
#3
Yu Luo, Muhammad Afzal Javed, Harry Deneer, Xialu Chen
Bacteria inhabit a vast range of biological niches and have evolved diverse mechanisms to cope with environmental stressors. The genus Acinetobacter comprises a complex group of Gram-negative bacteria. Some of these bacteria such as A. baumannii are nosocomial pathogens. They are often resistant to multiple antibiotics and are associated with epidemic outbreaks. A. radioresistens is generally considered to be a commensal bacterium on human skin or an opportunistic pathogen. Interestingly, this species has exceptional resistance to a range of environmental challenges which contributes to its persistence in clinical environment and on human skin...
May 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29746502/potential-involvement-of-the-18-kda-translocator-protein-and-reactive-oxygen-species-in-apoptosis-of-thp-1-macrophages-induced-by-sonodynamic-therapy
#4
Xin Sun, Shuyuan Guo, Wei Wang, Zhengyu Cao, Juhua Dan, Jiali Cheng, Wei Cao, Fang Tian, Wenwu Cao, Ye Tian
Sonodynamic therapy (SDT) with exogenous protoporphyrin IX (PpIX) or endogenous PpIX derived from 5-aminolevulinic acid (ALA) has been carried out to produce apoptotic effects on macrophages, indicating a potential treatment methodology for atherosclerosis. Our previous studies have found that mitochondria damage by reactive oxygen species (ROS) plays a major role in the SDT-induced apoptosis. This study aimed at investigating the potential involvement of the mitochondrial 18 kDa translocator protein (TSPO) and ROS in the pro-apoptotic effects of SDT on THP-1 macrophages...
2018: PloS One
https://www.readbyqxmd.com/read/29743445/increased-susceptibility-to-troglitazone-induced-mitochondrial-permeability-transition-in-type-2-diabetes-mellitus-model-rat
#5
Masahiro Segawa, Shuichi Sekine, Tomoyuki Sato, Kousei Ito
Troglitazone, a member of the thiazolidinedione class of antidiabetic drugs, was withdrawn from the market because it causes severe liver injury. One of the mechanisms for this adverse effect is thought to be mitochondrial toxicity. To investigate the characteristics of troglitazone-induced liver toxicity in more depth, the toxicological effects of troglitazone on hepatocytes and liver mitochondria were investigated using a rat model of type 2 diabetes mellitus (T2DM). Troglitazone was found to increase mitochondrial permeability transition (MPT) in the liver mitochondria of diabetic rats to a greater extent than in control rats, whereas mitochondrial membrane potential and oxidative phosphorylation were not affected...
2018: Journal of Toxicological Sciences
https://www.readbyqxmd.com/read/29742405/molecular-dynamics-analysis-of-cardiolipin-and-monolysocardiolipin-on-bilayer-properties
#6
Kevin J Boyd, Nathan N Alder, Eric R May
The mitochondrial lipid cardiolipin (CL) contributes to the spatial protein organization and morphological character of the inner mitochondrial membrane. Monolysocardiolipin (MLCL), an intermediate species in the CL remodeling pathway, is enriched in the multisystem disease Barth syndrome. Despite the medical relevance of MLCL, a detailed molecular description that elucidates the structural and dynamic differences between CL and MLCL has not been conducted. To this end, we performed comparative atomistic molecular dynamics studies on bilayers consisting of pure CL or MLCL to elucidate similarities and differences in their molecular and bulk bilayer properties...
May 8, 2018: Biophysical Journal
https://www.readbyqxmd.com/read/29733859/assembly-of-the-mitochondrial-cristae-organizer-mic10-is-regulated-by-mic26-mic27-antagonism-and-cardiolipin
#7
Heike Rampelt, Florian Wollweber, Carolin Gerke, Rinse de Boer, Ida J van der Klei, Maria Bohnert, Nikolaus Pfanner, Martin van der Laan
The multi-subunit mitochondrial contact site and cristae organizing system (MICOS) is a conserved protein complex of the inner mitochondrial membrane that is essential for maintenance of cristae architecture. The core subunit Mic10 forms large oligomers that build a scaffold and induce membrane curvature. The regulation of Mic10 oligomerization is poorly understood. We report that Mic26 exerts a destabilizing effect on Mic10 oligomers and thus functions in an antagonistic manner to the stabilizing subunit Mic27...
May 4, 2018: Journal of Molecular Biology
https://www.readbyqxmd.com/read/29729479/palmitate-lipotoxicity-in-enteric-glial-cells-lipid-remodeling-and-mitochondrial-ros-are-responsible-for-cyt-c-release-outside-mitochondria
#8
Lara Macchioni, Maya Petricciuolo, Magdalena Davidescu, Katia Fettucciari, Paolo Scarpelli, Rita Vitale, Leonardo Gatticchi, Pierluigi Orvietani, Andrea Marchegiani, Pierfrancesco Marconi, Gabrio Bassotti, Angela Corcelli, Lanfranco Corazzi
Enteric glial cells (EGCs) are components of the enteric nervous system, an organized structure that controls gut functions. EGCs may be vulnerable to different agents, such as bacterial infections that could alter the intestinal epithelial barrier, allowing bacterial toxins and/or other agents possessing intrinsic toxic effect to access cells. Palmitate, known to exhibit lipotoxicity, is released in the gut during the digestion process. In this study, we investigated the lipotoxic effect of palmitate in cultured EGCs, with particular emphasis on palmitate-dependent intracellular lipid remodeling...
May 2, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29723518/how-cardiolipin-peroxidation-alters-the-properties-of-the-inner-mitochondrial-membrane
#9
Marjut Vähäheikkilä, Tapio Peltomaa, Tomasz Róg, Mario Vazdar, Sanja Pöyry, Ilpo Vattulainen
Cardiolipins have multiple vital functions within biological cell membranes, most notably in the energy metabolism associated with the inner mitochondrial membrane. Considering their essential role, peroxidation of cardiolipins may plausibly have significant effects, as peroxidation is known to alter the functionality of lipid molecules. We used atomistic molecular dynamics simulations to study how peroxidation of cardiolipin affects the properties of the inner mitochondrial membrane. To this end, we explored what happens when varying fractions of fatty acid chains of cardiolipin are replaced by its four different oxidized products in systems modeling the inner mitochondrial membrane...
April 30, 2018: Chemistry and Physics of Lipids
https://www.readbyqxmd.com/read/29722112/the-development-of-central-venous-thrombosis-in-hemodialyzed-patients-is-associated-with-catheter-tip-depth-and-localization
#10
Vedran Premuzic, Drazen Perkov, Ranko Smiljanic
INTRODUCTION: The aim of our work was to analyze the incidence of tunneled hemodialysis catheters-related thrombosis in hemodialyzed patients depending on catheter tip depth and position and to evaluate the impact of other established risk factors responsible for development of central venous thrombosis. METHODS: The presence of central vein thrombosis, location, and the depth of the catheter tip was reviewed by two experienced radiologists. All patients with suspected central venous thrombosis had factor V Leiden, lupus anticoagulant, and cardiolipin antibodies checked (acIgM and acIgG) and were evaluated with cat-scan venography...
May 2, 2018: Hemodialysis International
https://www.readbyqxmd.com/read/29718252/mitochondria-temperature-and-the-pace-of-life
#11
Dillon J Chung, Timothy M Healy, Jessica L McKenzie, Adam J Chicco, Genevieve C Sparagna, Patricia M Schulte
Life history strategies, physiological traits and behavior are thought to covary along a "pace of life" axis, with organisms at the fast end of this continuum having higher fecundity, shorter lifespan, and more rapid development, growth, and metabolic rates. Countergradient variation represents a special case of pace of life variation, in which high-latitude organisms occupy the fast end of the continuum relative to low-latitude conspecifics when compared at a common temperature. Here, we use Atlantic killifish (Fundulus heteroclitus) to explore the role of mitochondrial properties as a mechanism underlying countergradient variation, and thus variation in the pace of life...
April 30, 2018: Integrative and Comparative Biology
https://www.readbyqxmd.com/read/29714040/mitoprotection-preserves-the-renal-vasculature-in-porcine-metabolic-syndrome
#12
Alfonso Eirin, Ahmad F Hedayat, Christopher M Ferguson, Stephen C Textor, Amir Lerman, Lilach O Lerman
NEW FINDINGS: What is the central question of this study? We hypothesized that chronic mitoprotection would decrease renal vascular remodeling and dysfunction in swine metabolic syndrome. What is the main finding and its importance? This study shows that experimental metabolic syndrome exerts renal microvascular and endothelial cell mitochondrial injury, which were attenuated by mitoprotection, underscoring the contribution of mitochondrial injury to the pathogenesis of metabolic syndrome-induced vascular damage...
April 30, 2018: Experimental Physiology
https://www.readbyqxmd.com/read/29707741/myocardial-energetics-and-heart-failure-a-review-of-recent-therapeutic-trials
#13
REVIEW
Kunal N Bhatt, Javed Butler
PURPOSE OF REVIEW: Several novel therapeutics being tested in patients with heart failure are based on myocardial energetics. This review will provide a summary of the recent trials in this area, including therapeutic options targeting various aspects of cellular and mitochondrial metabolism. RECENT FINDINGS: Agents that improve the energetic balance in myocardial cells have the potential to improve clinical heart failure status. The most promising therapies currently under investigation in this arena include (1) elamipretide, a cardiolipin stabilizer; (2) repletion of iron deficiency with intravenous ferrous carboxymaltose; (3) coenzyme Q10; and (4) the partial adenosine receptor antagonists capadenoson and neladenosone...
April 30, 2018: Current Heart Failure Reports
https://www.readbyqxmd.com/read/29706966/dysregulated-cd25-and-cytokine-expression-by-%C3%AE-%C3%AE-t-cells-of-systemic-sclerosis-patients-stimulated-with-cardiolipin-and-zoledronate
#14
Helena Migalovich Sheikhet, Jose Villacorta Hidalgo, Paul Fisch, Alexandra Balbir-Gurman, Yolanda Braun-Moscovici, Ilan Bank
Objectives: γδ T cells, a non-conventional innate lymphocyte subset containing cells that can be activated by lipids and phosphoantigens, are abnormally regulated in systemic sclerosis (SSc). To further evaluate the significance of this dysregulation, we compared how exposure to an autoantigenic lipid, cardiolipin (CL), during co-stimulation with an amino-bisphosphonate (zoledronate, zol), affects the activation and cytokine production of SSc and healthy control (HC) γδ T cells. Methods: Expression of CD25 on Vγ9+ , Vδ1+ , and total CD3+ T cells in cultured peripheral blood mononuclear cells (PBMCs), their binding of CD1d tetramers, and the effect of monoclonal antibody (mAb) blockade of CD1d were monitored by flow cytometry after 4 days of in vitro culture...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29705276/biophysical-evaluation-of-cardiolipin-content-as-a-regulator-of-the-membrane-lytic-effect-of-antimicrobial-peptides
#15
Laura Hernández-Villa, Marcela Manrique-Moreno, Chad Leidy, Małgorzata Jemioła-Rzemińska, Claudia Ortíz, Kazimierz Strzałka
Cardiolipin is an anionic tetra-acyl chained glycerophospholipid that increases lipid packing levels and induces intrinsic negative curvature in membranes. Cardiolipin is found in Staphylococcus aureus (S. aureus) membranes, where increased levels of this lipid are induced at the expense of diacyl phosphatidylglycerol in response to stress. We investigate cardiolipin as an inhibitor of the lytic activity of the cationic antimicrobial peptides LL-37 and ∆M2 in model systems with varying phosphatidylglycerol/cardiolipin ratios...
April 13, 2018: Biophysical Chemistry
https://www.readbyqxmd.com/read/29701849/origin-of-nontreponemal-antibodies-during-treponema-pallidum-infection-evidence-from-a-rabbit-model
#16
Kun Gao, Xu Shen, Yong Lin, Xiao-Zhen Zhu, Li-Rong Lin, Man-Li Tong, Yao Xiao, Hui-Lin Zhang, Xian-Ming Liang, Jian-Jun Niu, Li-Li Liu, Tian-Ci Yang
The origin of nontreponemal antibodies during syphilis infection is hotly debated. Here, we analysed the immune response in rabbits immunized with various antigens. Inactivated treponemes elicited the production of low-titre nontreponemal antibodies in some rabbits. Cardiolipin combined with bovine serum albumin also induced anti-cardiolipin antibody production. These findings indicate that T. pallidum contained a cardiolipin antigen with weak immunogenicity. However, active T.pallidum induced higher nontreponemal antibody production with strong immunogenicity at an earlier time point, and the antibody titre was consecutive, suggesting the high nontreponemal antibody titre resulted from the combined effects of both the T...
April 25, 2018: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29697389/-rheological-properties-of-blood-serum-at-systemic-sclerosis
#17
A Zabara, S Selezneva, S Dubina, O Syniachenko
Systemic sclerosis (SSc) is accompanied by severe disorders of serum component of blood rheological properties (BRP), the study indicators of which performed as the monitoring of the therapeutic interventions effectiveness. BRP changes have not been established at different forms of SSc, the connection between physicochemical serum rheological properties and morphological signs of vascular skin lesions and extracardiac implications of the disease remains unknown. The purpose and objectives of the study - to evaluate the changes of BRP serum component with clinical and morphological variants of limited and diffuse form of SSc...
March 2018: Georgian Medical News
https://www.readbyqxmd.com/read/29695864/cryo-em-structure-of-the-gasdermin-a3-membrane-pore
#18
Jianbin Ruan, Shiyu Xia, Xing Liu, Judy Lieberman, Hao Wu
Gasdermins mediate inflammatory cell death after cleavage by caspases or other, unknown enzymes. The cleaved N-terminal fragments bind to acidic membrane lipids to form pores, but the mechanism of pore formation remains unresolved. Here we present the cryo-electron microscopy structures of the 27-fold and 28-fold single-ring pores formed by the N-terminal fragment of mouse GSDMA3 (GSDMA3-NT) at 3.8 and 4.2 Å resolutions, and of a double-ring pore at 4.6 Å resolution. In the 27-fold pore, a 108-stranded anti-parallel β-barrel is formed by two β-hairpins from each subunit capped by a globular domain...
April 25, 2018: Nature
https://www.readbyqxmd.com/read/29694924/loss-of-tafazzin-results-in-decreased-myoblast-differentiation-in-c2c12-cells-a-myoblast-model-of-barth-syndrome-and-cardiolipin-deficiency
#19
Wenjia Lou, Christian A Reynolds, Yiran Li, Jenney Liu, Maik Hüttemann, Michael Schlame, David Stevenson, Douglas Strathdee, Miriam L Greenberg
Barth syndrome (BTHS) is an X-linked genetic disorder resulting from mutations in the tafazzin gene (TAZ), which encodes the transacylase that remodels the mitochondrial phospholipid cardiolipin (CL). While most BTHS patients exhibit pronounced skeletal myopathy, the mechanisms linking defective CL remodeling and skeletal myopathy have not been determined. In this study, we constructed a CRISPR-generated stable tafazzin knockout (TAZ-KO) C2C12 myoblast cell line. TAZ-KO cells exhibit mitochondrial deficits consistent with other models of BTHS, including accumulation of monolyso-CL (MLCL), decreased mitochondrial respiratory, and increased mitochondrial ROS production...
April 22, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29685012/evaluating-the-utility-of-autoantibodies-for-disease-activity-and-relapse-in-giant-cell-arteritis
#20
T Kuret, K Lakota, A Hočevar, B Burja, S Čučnik, S Sodin-Semrl
In patients with giant cell arteritis (GCA), autoantibodies against cytoskeletal elements, cardiolipin, neutrophil cytoplasmic antigens, ferritin, endothelial and smooth muscle cells have been reported, however no updated reviews are available evaluating their clinical utility. Methodology of detection is important, especially for quantitative assays, e.g. enzyme-linked immunoassays and multiplex beadbased immunoassays, while semiquantitative assays contribute valuable data on isoforms, epitope mapping and cellular localization...
March 2018: Journal of Biological Regulators and Homeostatic Agents
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