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Phosphotidylserine

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https://www.readbyqxmd.com/read/27086970/phosphatidylcholine-protects-neurons-from-toxic-effects-of-amyloid-%C3%AE-protein-in-culture
#1
Mihee Ko, Toshihide Hattori, Mohammad Abdullah, Jian-Sheng Gong, Tsuneo Yamane, Makoto Michikawa
Amyloid β-protein (Aβ) is the major component of extracellular plaques in the brains of patients with Alzheimer's disease. It has been suggested that the interaction of Aβ with membrane cholesterol is essential for Aβ to exert neurotoxicity; however, the effect of phospholipids, another major membrane lipid component, on Aβ-induced neurotoxicity remains unclarified. Here we report the protective effect of phosphatidylcholine (PC) on primary cultured neurons against Aβ1-42-induced damage. Aβ1-42 caused neuronal death as demonstrated by lactose dehydrogenase (LDH) release, which was completely prevented by a pretreatment with PC in a dose-dependent manner...
July 1, 2016: Brain Research
https://www.readbyqxmd.com/read/26847865/evaluation-of-in-vitro-storage-characteristics-of-cold-stored-platelet-concentrates-with-n-acetylcysteine-nac
#2
Mallikarjun Handigund, Tae Won Bae, Jaehyeon Lee, Yong Gon Cho
Platelets play a vital role in hemostasis and thrombosis, and their demand and usage has multiplied many folds over the years. However, due to the short life span and storage constraints on platelets, it is allowed to store them for up to 7 days at room temperature (RT); thus, there is a need for an alternative storage strategy for extension of shelf life. Current investigation involves the addition of 50 mM N acetylcysteine (NAC) in refrigerated concentrates. Investigation results revealed that addition of NAC to refrigerated concentrates prevented platelet activation and reduced the sialidase activity upon rewarming as well as on prolonged storage...
February 2016: Transfusion and Apheresis Science
https://www.readbyqxmd.com/read/26660948/phosphotidylserine-exposure-and-neutrophil-extracellular-traps-enhance-procoagulant-activity-in-patients-with-inflammatory-bowel-disease
#3
Zhangxiu He, Yu Si, Tao Jiang, Ruishuang Ma, Yan Zhang, Muhua Cao, Tao Li, Zhipeng Yao, Lu Zhao, Shaohong Fang, Bo Yu, Zengxiang Dong, Hemant S Thatte, Yayan Bi, Junjie Kou, Shufen Yang, Daxun Piao, Lirong Hao, Jin Zhou, Jialan Shi
Inflammatory bowel disease (IBD)-associated thromboembolic event often lacks precise aetiology. The aim of this study was to investigate the contribution of phosphatidylserine (PS) exposure and neutrophil extracellular traps (NETs) towards the hypercoagulable state in IBD. We demonstrated that the levels of PS exposed MPs and the sources of MP-origin, platelets, erythrocytes, leukocytes and cultured endothelial cells (ECs) were higher in IBD groups than in healthy controls using flow cytometry and confocal microscopy...
April 2016: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/26481633/nitrincola-nitratireducens-sp-nov-isolated-from-a-haloalkaline-crater-lake
#4
Aditya Singh, Bhumika Vaidya, Naga Radha Srinivas Tanuku, Anil Kumar Pinnaka
The novel, cream coloured, Gram-negative-staining, rod-shaped, motile bacteria, designated strains AK23(T) and AK28, were isolated from sediment samples collected from Lonar Lake, Buldhana district, India. The predominant fatty acids were C18:1ω7c, C16:0, C10:0 3OH and C16:1ω7c and/or iso-C15:0 2OH (summed feature 3). Polar lipid content of strains AK23(T) and AK28 were found to be phosphatidylethanolamine (PE), phosphatidylglycerol (PG), phosphotidylserine (PS), one unidentified phospholipid (PL) and two unidentified lipids (L1 and L2)...
December 2015: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/25946039/-6e-10e-isopolycerasoidol-and-6e-10e-isopolycerasoidol-methyl-ester-prenylated-benzopyran-derivatives-from-pseuduvaria-monticola-induce-mitochondrial-mediated-apoptosis-in-human-breast-adenocarcinoma-cells
#5
Hairin Taha, Chung Yeng Looi, Aditya Arya, Won Fen Wong, Lee Fah Yap, Mohadeseh Hasanpourghadi, Mustafa A Mohd, Ian C Paterson, Hapipah Mohd Ali
Phytochemicals from Pseuduvaria species have been reported to display a wide range of biological activities. In the present study, a known benzopyran derivative, (6E,10E) isopolycerasoidol (1), and a new benzopyran derivative, (6E,10E) isopolycerasoidol methyl ester (2), were isolated from a methanol extract of Pseuduvaria monticola leaves. The structures of the isolated compounds were elucidated by spectroscopic methods including 1D and 2D NMR, IR, UV, and LCMS-QTOF, and by comparison with previously published data...
2015: PloS One
https://www.readbyqxmd.com/read/25688860/platelet-surface-associated-activation-and-secretion-mediated-inhibition-of-coagulation-factor-xii
#6
Natalia V Zakharova, Elena O Artemenko, Nadezhda A Podoplelova, Anastasia N Sveshnikova, Irina A Demina, Fazly I Ataullakhanov, Mikhail A Panteleev
Coagulation factor XII (fXII) is important for arterial thrombosis, but its physiological activation mechanisms are unclear. In this study, we elucidated the role of platelets and platelet-derived material in fXII activation. FXII activation was only observed upon potent platelet stimulation (with thrombin, collagen-related peptide, or calcium ionophore, but not ADP) accompanied by phosphatidylserine exposure and was localised to the platelet surface. Platelets from three patients with grey platelet syndrome did not activate fXII, which suggests that platelet-associated fXII-activating material might be released from α-granules...
2015: PloS One
https://www.readbyqxmd.com/read/24466103/arsenic-trioxide-induces-apoptosis-in-human-platelets-via-c-jun-nh2-terminal-kinase-activation
#7
Yicun Wu, Jin Dai, Weilin Zhang, Rong Yan, Yiwen Zhang, Changgeng Ruan, Kesheng Dai
Arsenic trioxide (ATO), one of the oldest drugs in both Western and traditional Chinese medicine, has become an effective anticancer drug, especially in the treatment of acute promyelocytic leukemia (APL). However, thrombocytopenia occurred in most of ATO-treated patients with APL or other malignant diseases, and the pathogenesis remains unclear. Here we show that ATO dose-dependently induces depolarization of mitochondrial inner transmembrane potential (ΔΨm), up-regulation of Bax and down-regulation of Bcl-2 and Bcl-XL, caspase-3 activation, and phosphotidylserine (PS) exposure in platelets...
2014: PloS One
https://www.readbyqxmd.com/read/24236174/effects-of-interval-and-continuous-exercise-training-on-cd4-lymphocyte-apoptotic-and-autophagic-responses-to-hypoxic-stress-in-sedentary-men
#8
Tzu-Pin Weng, Shu-Chun Huang, Yu-Fen Chuang, Jong-Shyan Wang
Exercise is linked with the type/intensity-dependent adaptive immune responses, whereas hypoxic stress facilitates the programmed death of CD4 lymphocytes. This study investigated how high intensity-interval (HIT) and moderate intensity-continuous (MCT) exercise training influence hypoxia-induced apoptosis and autophagy of CD4 lymphocytes in sedentary men. Thirty healthy sedentary males were randomized to engage either HIT (3-minute intervals at 40% and 80%VO2max, n=10) or MCT (sustained 60%VO2max, n=10) for 30 minutes/day, 5 days/week for 5 weeks, or to a control group that did not received exercise intervention (CTL, n=10)...
2013: PloS One
https://www.readbyqxmd.com/read/21922137/dietary-flavonoid-fisetin-targets-caspase-3-deficient-human-breast-cancer-mcf-7-cells-by-induction-of-caspase-7-associated-apoptosis-and-inhibition-of-autophagy
#9
Pei-Ming Yang, Ho-Hsing Tseng, Chih-Wen Peng, Wen-Shu Chen, Shu-Jun Chiu
The outcome of producing apoptotic defects in cancer cells is the primary obstacle that limits the therapeutic efficacy of anticancer agents, and hence the development of novel agents targeting novel non-canonical cell death pathways has become an imperative mission for clinical research. Fisetin (3,3',4',7-tetrahydroxyflavone) is a naturally occurring flavonoid commonly found in fruits and vegetables. In this study, we investigated the potential anticancer effects of fisetin on breast cancer cells. The result showed fisetin induced higher cytotoxicity in human breast cancer MCF-7 than in MDA-MB-231 cells otherwise it did not exert any detectable cytotoxicity in non-tumorigenic MCF-10A cells...
February 2012: International Journal of Oncology
https://www.readbyqxmd.com/read/21813711/expression-of-a-naturally-occurring-angiotensin-at-1-receptor-cleavage-fragment-elicits-caspase-activation-and-apoptosis
#10
Julia L Cook, Akannsha Singh, Dawn DeHaro, Jawed Alam, Richard N Re
Several transmembrane receptors are documented to accumulate in nuclei, some as holoreceptors and others as cleaved receptor products. Our prior studies indicate that a population of the 7-transmembrane angiotensin type-1 receptor (AT(1)R) is cleaved in a ligand-augmented manner after which the cytoplasmic, carboxy-terminal cleavage fragment (CF) traffics to the nucleus. In the present report, we determine the precise cleavage site within the AT(1)R by mass spectrometry and Edman sequencing. Cleavage occurs between Leu(305) and Gly(306) at the junction of the seventh transmembrane domain and the intracellular cytoplasmic carboxy-terminal domain...
November 2011: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/20730532/anti-cancer-effect-of-rubropunctatin-against-human-gastric-carcinoma-cells-bgc-823
#11
Yunquan Zheng, Yanwen Xin, Xianai Shi, Yanghao Guo
The Monascus pigment, rubropunctatin, was extracted and purified from red mold rice (RMR) and its cytotoxic activities against human gastric adenocarcinoma BGC-823 cells were studied both in vitro and in vivo. Rubropunctatin inhibited the proliferation of BGC-823 cells with an inhibitory concentration (IC₅₀) of 12.57 μM, while it exhibited no significant toxicity to normal gastric epithelial cell GES-1 at the same concentration. Treatment of BGC-823 cells with rubropunctatin resulted in a dose- and time-dependent apoptosis, as validated by the increase in the percentage of cells in sub-G1 phase and phosphotidylserine externalization...
November 2010: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/20531278/whole-body-heat-exposure-induces-membrane-changes-in-spermatozoa-from-the-cauda-epididymidis-of-laboratory-mice
#12
Harsha Wechalekar, Brian P Setchell, Eleanor J Peirce, Mario Ricci, Chris Leigh, William G Breed
This study was carried out to determine if exposure to hot environmental temperatures had a direct, detrimental effect on sperm quality. For this the effect of whole-body heat exposure on epididymal spermatozoa of laboratory mice was investigated. C57BL/6 mice (n = 7) were housed in a microclimate chamber at 37 degrees C-38 degrees C for 8 h per day for three consecutive days, while control mice (n = 7) were kept at 23 degrees C-24 degrees C. Cauda epididymal spermatozoa were obtained 16 h after the last heat treatment...
July 2010: Asian Journal of Andrology
https://www.readbyqxmd.com/read/20154447/smoking-induced-alterations-in-platelet-membrane-fluidity-and-na-k-atpase-activity-in-chronic-cigarette-smokers
#13
Pannuru Padmavathi, Vaddi Damodara Reddy, Paramahamsa Maturu, Nallanchakravarthula Varadacharyulu
AIM: Cigarette smoking is a recognized risk factor for cardiovascular diseases and has been implicated in the pathogenesis of atherosclerosis. Platelet adhesiveness and aggregation increases as a result of smoking. Cigarette smoking modifies haemostatic parameters via thrombosis with a consequently higher rate of cardiovascular events, but smoking-induced alterations of platelet membrane fluidity and other changes have not been studied. METHODS: Thirty experimental and control subjects (mean age 35+/-8) were selected for the study...
June 30, 2010: Journal of Atherosclerosis and Thrombosis
https://www.readbyqxmd.com/read/20136832/16alpha-hydroxycleroda-3-13-14-z-dien-15-16-olide-from-polyalthia-longifolia-a-safe-and-orally-active-antileishmanial-agent
#14
Pragya Misra, Koneni V Sashidhara, Suriya Pratap Singh, Awanish Kumar, Reema Gupta, Shailendra S Chaudhaery, Souvik Sen Gupta, H K Majumder, Anil K Saxena, Anuradha Dube
BACKGROUND AND PURPOSE: New antileishmanials from natural products are urgently needed due to the emergence of drug resistance complicated by severe cytotoxic effects. 16alpha-Hydroxycleroda-3,13 (14)Z-dien-15,16-olide (Compound 1) from Polyalthia longifolia was found to be a potential antileishmanial and non-cytotoxic, as evidenced by long-term survival (>6 months) of treated animals. This prompted us to determine its target and, using molecular modelling, identify the interactions responsible for its specific antileishmanial activity...
March 2010: British Journal of Pharmacology
https://www.readbyqxmd.com/read/20136500/tnf-alpha-induced-mitochondrial-alterations-in-human-t-cells-requires-fadd-and-caspase-8-activation-but-not-rip-and-caspase-3-activation
#15
Mehdi Shakibaei, Bokyung Sung, Gautam Sethi, Bharat B Aggarwal
Although much is known about how TNF-alpha induces apoptosis in the presence of inhibitors of protein synthesis, little is known about how it induces apoptosis without these inhibitors. In this report we investigated temporal sequence of events induced by TNF-alpha in the absence of protein synthesis. Regardless of whether we measured the effects by plasma membrane phosphotidylserine accumulation, by DNA strand breaks, or activation of caspases, significant changes were observed only between 12-24 h of TNF-alpha treatment...
September 15, 2010: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/20083129/arsenite-induces-apoptosis-in-human-mesenchymal-stem-cells-by-altering-bcl-2-family-proteins-and-by-activating-intrinsic-pathway
#16
Santosh Yadav, Yongli Shi, Feng Wang, He Wang
PURPOSE: Environmental exposure to arsenic is an important public health issue. The effects of arsenic on different tissues and organs have been intensively studied. However, the effects of arsenic on bone marrow mesenchymal stem cells (MSCs) have not been reported. This study is designed to investigate the cell death process caused by arsenite and its related underlying mechanisms on MSCs. The rationale is that absorbed arsenic in the blood circulation can reach to the bone marrow and may affect the cell survival of MSCs...
May 1, 2010: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/19644031/systemic-hypoxia-enhances-exercise-mediated-bactericidal-and-subsequent-apoptotic-responses-in-human-neutrophils
#17
RANDOMIZED CONTROLLED TRIAL
Jong-Shyan Wang, Ya-Ting Chiu
Phagocytosis and oxidative burst are critical host defense mechanisms in which neutrophils clear invading pathogens. Clearing phagocytic neutrophils by triggering apoptosis is an essential process for controlling inflammation. This study elucidates how various exercise bouts with/without hypoxia affected neutrophil bactericidal activity and subsequent apoptosis in humans. Fifteen sedentary males performed six distinct experimental tests in an air-conditioned normobaric hypoxia chamber: two normoxic exercises [strenuous exercise (SE; up to maximal O2 consumption) and moderate exercise (ME; 50% maximal O2 consumption for 30 min) while exposed to 21% O2], two hypoxic exercises (ME for 30 min while exposed to 12% and 15% O2), and two hypoxic exposures (resting for 30 min while exposed to 12% and 15% O2)...
October 2009: Journal of Applied Physiology
https://www.readbyqxmd.com/read/19502262/genetic-polymorphism-in-milk-fat-globule-egf-factor-8-mfg-e8-is-associated-with-systemic-lupus-erythematosus-in-human
#18
C Y Hu, C S Wu, H F Tsai, S K Chang, W I Tsai, P N Hsu
Milk fat globule-EGF factor 8 (MFG-E8) is a molecule implicated in phagocytic clearance of apoptotic cells by bridging between macrophages and apoptotic cells. Defects in MFG-E8 cause lupus-like disease in murine models. The aim of our study is to determine whether genetic variation in MFG-E8 predisposes human to systemic lupus erythematosus (SLE). A case-control study of MFG-E8 genetic polymorphism was performed on 147 SLE patients and 146 non-lupus control subjects. Single nucleotide polymorphisms (SNPs) in the coding sequence of human MFG-E8 gene were investigated...
July 2009: Lupus
https://www.readbyqxmd.com/read/19238757/characterization-of-apoptosis-induced-by-grouper-iridovirus-in-two-newly-established-cell-lines-from-barramundi-lates-calcarifer-bloch
#19
Y S Lai, P P Chiou, W J Chen, Y C Chen, C W Chen, I S Chiu, S D Chen, Y H Cheng, C Y Chang
Two new cell lines have been established from the muscle and swim bladder tissues of barramundi, Lates calcarifer, and designated as BM (barramundi muscle) and BSB (barramundi swimbladder), respectively. The cells multiplied well at 28 degrees C in Leibovitz's L-15 medium supplemented with 10% foetal bovine serum, and have been continuously subcultured more than 100 times to date. Morphologically, BM cells were mostly fibroblastic, whereas BSB were mostly epithelial. Both cell lines were susceptible to grouper iridovirus (GIV) and displayed characteristics of apoptosis after viral infection...
November 2008: Journal of Fish Diseases
https://www.readbyqxmd.com/read/18983513/platelet-hyperprocoagulant-activity-in-type-2-diabetes-mellitus-attenuation-by-glycoprotein-iib-iiia-inhibition
#20
M Razmara, P Hjemdahl, C-G Ostenson, N Li
BACKGROUND: Platelets are hyperactive in Type 2 diabetes mellitus (T2DM), and antiplatelet treatment with glycoprotein (GP) IIb/IIIa inhibitors provides better thrombotic protection in DM than in non-diabetic subjects. OBJECTIVE: We hypothesized that diabetic platelets are hyperprocoagulant, and that this hyperactivity can be inhibited by GPIIb/IIIa blockade. METHODS: Patients with T2DM and gender/age/body mass index-matched non-diabetic controls were recruited (n = 12 for both) to study the effect of GPIIb/IIIa blockade on platelet procoagulant activity...
December 2008: Journal of Thrombosis and Haemostasis: JTH
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