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https://www.readbyqxmd.com/read/28917588/association-between-fsp-cvhi-inflammatory-cytokines-and-the-incidence-of-primary-stroke
#1
Xiao-Yun Huang, Wen-Jin Fu, Zhi-Chang Chen, Zhi-Zhong Mei, Ying-Li Yu, Hao-Wei Fang, Yi-Hong Huang, Han Lin, Jian-Jun Chen, Ming-Xia Wang, Shao-Bing Guan, Wan-Xian Lu, Xiao-Ling Chen
This case-control study was designed to establish a new risk-prediction model for primary stroke using Framingham stroke profile (FSP), cerebral vascular hemodynamic indexes (CVHI) and plasma inflammatory cytokines including hs-CRP, IL-6, TNF-α and Lp-PLA2. A total of 101 primary stroke patients admitted to Dongguan Houjie Hospital between August 2014 and June 2015 were assigned into the case group, and 156 age- and gender-matched healthy subjects from the Houjie Community were allocated into the control group...
September 13, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28911659/the-detoxifying-effects-of-structural-elements-of%C3%A2-persimmon-tannin-on-chinese-cobra-phospholipase-a2-correlated-with-their-structural-disturbing-effects-well
#2
Ying Zhang, Chun-Mei Li
The effects of persimmon tannin (PT) characteristic structural elements on Naja atra phospholipase A2 (PLA2)-induced lethality, myotoxicity, and hemolysis in mice models were determined. In addition, methods including surface plasmon resonance, dynamic light scattering, and Fourier transform infrared spectroscopy were explored to uncover the possible detoxifying mechanisms of PT on snake venom PLA2. Our results revealed that PT characteristic elements (EGCG, ECG, A-type EGCG dimer, and A-type ECG dimer) could neutralize the lethality, myotoxicity, and hemolysis of PLA2...
July 2017: Journal of Food and Drug Analysis
https://www.readbyqxmd.com/read/28900364/performance-characteristics-of-lipoprotein-associated-phospholipase-a2-activity-assay-on-the-dimension-vista-analyser-and-preliminary-study-of-a-healthy-italian-population
#3
Alessandro De Stefano, Liliana Mannucci, Renato Massoud, Sergio Bernardini, Claudio Cortese
INTRODUCTION: Lipoprotein-associated phospholipase A2 (Lp-PLA2) is a marker of vascular inflammation associated with coronary heart disease and stroke. We evaluated analytical performance of the PLAC® Activity Test on Siemens Dimension Vista® 1500 analyzer and measured Lp-PLA2 activity in Italian adults to establish reference intervals (RIs) and evaluate correlation with circulating lipids and age. MATERIALS AND METHODS: The evaluation protocol consisted of precision, linearity, sensitivity, method comparison, substrate depletion ("hook") effect and interference assessment...
October 15, 2017: Biochemia Medica: časopis Hrvatskoga Društva Medicinskih Biokemičara
https://www.readbyqxmd.com/read/28899631/biochemical-differences-in-the-mass-and-activity-tests-of-lipoprotein-associated-phospholipase-a2-explain-the-discordance-in-results-between-the-two-assay-methods
#4
Shaoqiu Zhuo, Robert L Wolfert, Chong Yuan
OBJECTIVES: There are two platforms for the detection of Lp-PLA2 in sera or plasmas: by its enzymatic activity (PLAC® activity test) and by its mass concentration (PLAC® mass test). It has been long recognized that these two platforms are not correlated well. The underlying cause for this is therefore investigated by the biochemical characterization of the two PLAC tests. DESIGN & METHODS: Human sera with and without the treatment by detergent were fractionated by using a Superose-6 column in phosphate buffered saline and the phospholipid associated Lp-PLA2 was assessed by both PLAC mass and activity tests...
September 9, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28894144/molecular-details-of-secretory-phospholipase-a2-from-flax-linum-usitatissimum-l-provide-insight-into-its-structure-and-function
#5
Payal Gupta, Prasanta K Dash
Secretory phospholipase A2 (sPLA2) are low molecular weight proteins (12-18 kDa) involved in a suite of plant cellular processes imparting growth and development. With myriad roles in physiological and biochemical processes in plants, detailed analysis of sPLA2 in flax/linseed is meagre. The present work, first in flax, embodies cloning, expression, purification and molecular characterisation of two distinct sPLA2s (I and II) from flax. PLA2 activity of the cloned sPLA2s were biochemically assayed authenticating them as bona fide phospholipase A2...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28892824/resolvin-d1-increases-mucin-secretion-in-cultured-rat-conjunctival-goblet-cells-via-multiple-signaling-pathways
#6
Marit Lippestad, Robin R Hodges, Tor P Utheim, Charles N Serhan, Darlene A Dartt
Purpose: Goblet cells in the conjunctiva secrete mucin into the tear film protecting the ocular surface. The proresolution mediator resolvin D1 (RvD1) regulates mucin secretion to maintain homeostasis during physiological conditions and in addition, actively terminates inflammation. We determined the signaling mechanisms used by RvD1 in cultured rat conjunctival goblet cells to increase intracellular [Ca2+] ([Ca2+]i) and induce glycoconjugate secretion. Methods: Increase in [Ca2+]i were measured using fura 2/AM and glycoconjugate secretion determined using an enzyme-linked lectin assay with the lectin Ulex Europaeus Agglutinin 1...
September 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28890171/general-characterization-of-the-venoms-from-two-species-of-rattlesnakes-and-an-intergrade-population-c-lepidus-x-aquilus-from-aguascalientes-and-zacatecas-mexico
#7
Eric Rivas, Edgar Neri-Castro, Melisa Bénard-Valle, Arely I Hernánez-Dávila, F Zamudio, Alejandro Alagón
The venoms from two species of rock rattlesnakes and an intergrade population were studied. Differences were noted in SDS-PAGE and RP-HPLC profiles and only the venom from the intergrade population showed low procoagulant activity. Also, a Crotoxin-like neurotoxic PLA2 was identified in the venom of C. l. klauberi, the most toxic of the analyzed venoms. This is the first report of such a toxin in C. l. klauberi from Aguascalientes, Mexico.
September 7, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28888832/ageing-sensitized-by-ipla2%C3%AE-deficiency-induces-liver-fibrosis-and-intestinal-atrophy-involving-suppression-of-homeostatic-genes-and-alteration-of-intestinal-lipids-and-bile-acids
#8
Li Jiao, Hongying Gan-Schreier, Xingya Zhu, Wang Wei, Sabine Tuma-Kellner, Gerhard Liebisch, Wolfgang Stremmel, WaleeChamulitrat
Ageing is a major risk factor for various forms of liver and gastrointestinal (GI) disease and genetic background may contribute to the pathogenesis of these diseases. Group VIA phospholipase A2 or iPLA2β is a homeostatic PLA2 by playing a role in phospholipid metabolism and remodeling. Global iPLA2β(-/-) mice exhibit aged-dependent phenotypes with body weight loss and abnormalities in the bone and brain. We have previously reported the abnormalities in these mutant mice showing susceptibility for chemical-induced liver injury and colitis...
September 6, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28874838/structural-determinants-of-5-6-epoxyeicosatrienoic-acid-binding-to-and-activation-of-trpv4-channel
#9
Alejandro Berna-Erro, Mercè Izquierdo-Serra, Romina V Sepúlveda, Fanny Rubio-Moscardo, Pau Doñate-Macián, Selma A Serra, Julia Carrillo-Garcia, Alex Perálvarez-Marín, Fernando González-Nilo, José M Fernández-Fernández, Miguel A Valverde
TRPV4 cation channel activation by cytochrome P450-mediated derivatives of arachidonic acid (AA), epoxyeicosatrienoic acids (EETs), constitute a major mechanisms of endothelium-derived vasodilatation. Besides, TRPV4 mechano/osmosensitivity depends on phospholipase A2 (PLA2) activation and subsequent production of AA and EETs. However, the lack of evidence for a direct interaction of EETs with TRPV4 together with claims of EET-independent mechanical activation of TRPV4 has cast doubts on the validity of this mechanism...
September 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28874163/expression-of-factors-involved-in-apoptosis-and-cell-survival-is-correlated-with-enzymes-synthesizing-lysophosphatidic-acid-and-its-receptors-in-granulosa-cells-originating-from-different-types-of-bovine-ovarian-follicles
#10
Emilia Sinderewicz, Katarzyna Grycmacher, Dorota Boruszewska, Ilona Kowalczyk-Zięba, Joanna Staszkiewicz, Tomasz Ślężak, Izabela Woclawek-Potocka
BACKGROUND: Lysophosphatidic acid (LPA) regulates reproductive processes in the cow. Ovarian granulosa cells play a pivotal role in follicle growth and development. Nevertheless, the role of LPA in the local regulation of granulosa cell function in different follicle categories in the bovine ovary has not been investigated. METHODS: Ovarian follicles were divided into healthy, transitional and atretic categories. The expression levels of AX, PLA2, LPARs and factors involved in apoptosis and cell survival processes in granulosa cells in different types of follicles were measured by real-time PCR...
September 6, 2017: Reproductive Biology and Endocrinology: RB&E
https://www.readbyqxmd.com/read/28867438/neuromuscular-paralysis-by-the-basic-phospholipase-a2-subunit-of-crotoxin-from-crotalus-durissus-terrificus-snake-venom-needs-its-acid-chaperone-to-concurrently-inhibit-acetylcholine-release-and-produce-muscle-blockage
#11
Walter L G Cavalcante, José B Noronha-Matos, Maria A Timóteo, Marcos R M Fontes, Márcia Gallacci, Paulo Correia-de-Sá
BACKGROUND AND PURPOSE: Crotoxin (CTX), a heterodimeric phospholipase A2 (PLA2) neurotoxin from Crotalus durissus terrificus snake venom, promotes irreversible blockade of neuromuscular transmission. Indirect electrophysiological evidence suggests that CTX exerts a primary inhibitory action on transmitter exocytosis, yet contribution of a postsynaptic action of the toxin resulting from nicotinic receptor desensitization cannot be excluded. Here, we examined the blocking effect of CTX on nerve-evoked transmitter release measured directly using radioisotope neurochemistry and video microscopy with the FM4-64 fluorescent dye...
September 1, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28864658/pla2-and-enpp6-may-act-in-concert-to-generate-phosphocholine-from-the-matrix-vesicle-membrane-during-skeletal-mineralization
#12
Alan J Stewart, Darren T K Leong, Colin Farquharson
Mineralization is a key process in the formation of bone and cartilage in vertebrates, involving the deposition of calcium and phosphate containing hydroxyapatite (HA) mineral within a collagenous matrix. Inorganic phosphate (Pi) accumulation within matrix vesicles (MVs) is a fundamental stage in the precipitation of HA, with PHOSPHO1 being identified as the principal enzyme acting to produce Pi PHOSPHO1 is a dual-specific phosphocholine/phosphoethanolamine phosphatase enriched in mineralizing cells and within MVs...
September 1, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28858248/evaluation-of-rhamnetin-as-an-inhibitor-of-the-pharmacological-effect-of-secretory-phospholipase-a2
#13
Mariana Novo Belchor, Henrique Hessel Gaeta, Caroline Fabri Bittencourt Rodrigues, Caroline Ramos da Cruz Costa, Daniela de Oliveira Toyama, Luiz Felipe Domingues Passero, Marcia Dalastra Laurenti, Marcos Hikari Toyama
Rhamnetin (Rhm), 3-O-methylquercetin (3MQ), and Rhamnazin (Rhz) are methylated derivatives of quercetin commonly found in fruits and vegetables that possess antioxidant and anti-inflammatory properties. Phospholipase A2 (PLA2) displays several important roles during acute inflammation; therefore, this study aimed at investigating new compounds able to inhibit this enzyme, besides evaluating creatine kinase (CK) levels and citotoxicity. Methylated quercetins were compared with quercetin (Q) and were incubated with secretory PLA2 (sPLA2) from Bothrops jararacussu to determine their inhibitory activity...
August 31, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28855258/identification-and-characterization-of-vibrio-vulnificus-plpa-encoding-a-phospholipase-a2-essential-for-pathogenesis
#14
Kyung Ku Jang, Zee-Won Lee, Bityeoul Kim, Young Hyun Jung, Ho Jae Han, Myung Hee Kim, Byoung Sik Kim, Sang Ho Choi
The marine bacterium Vibrio vulnificus causes food-borne diseases, which may lead to life-threatening septicemia in some individuals. Therefore, identifying virulence factors in V. vulnificus is of high priority. We performed a transcriptome analysis on V. vulnificus after infection of human intestinal HT29-methotrexate cells, and found induction of plpA, encoding a putative phospholipase VvPlpA. Bioinformatics, biochemical, and genetic analyses demonstrated that VvPlpA is a phospholipase A2 (PLA2) secreted in the type II secretion system (T2SS)-dependent manner...
August 30, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28851514/a-novel-calcium-independent-phospholipase-a2-and-its-physiological-roles-in-development-and-immunity-of-a-lepidopteran-insect-spodoptera-exigua
#15
Md Sadekuzzaman, Neelam Gautam, Yonggyun Kim
Phospholipase A2 (PLA2) catalyzes hydrolysis of ester linkage at sn-2 position of phospholipids. At least 15 groups (I-XV) of PLA2 gene superfamily are associated with various physiological processes such as digestion, secretion, immunity, and maintenance of membrane integrity. This study suggests that various insects encode putative Group VI PLA2s representing intracellular and calcium-independent PLA2s (iPLA2). These insect iPLA2s are separated into at least two subgroups: iPLA2A (Group VIA-like) and iPLA2B (non-Group VIA)...
August 26, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28837825/renal-effects-of-bunodosoma-caissarum-crude-extract-prostaglandin-and-endothelin-involvement
#16
René Duarte Martins, Roberta Jeane Bezerra Jorge, Renata de Sousa Alves, Antônio Gomes da Silva Neto, Paulo Sergio F Barbosa, Alice Maria Costa Martins, Marcos H Toyama, Helena Serra Azul Monteiro
Sea anemones contain a variety of interesting biologically active compounds, including some potent toxins. PLA2 from Bunodosoma caissarum, a sea anemone endemic in the Brazilian southern coast, has shown renal alterations on isolated kidney. The aim of this study was to evaluate the renal and vascular effects of B. caissarum crude extract (BcE) on isolated perfused kidney and arteriolar mesenteric bed, as well the involvement of prostaglandins and endothelin. BcE did not show any effect on arteriolar mesenteric bed, but increased perfusion pressure, renal vascular resistance, urinary flow, glomerular filtration rate and decreased the percentage of sodium tubular transport on isolated perfused kidney...
August 23, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28822684/cross-reactivity-and-inhibition-myotoxic-effects-induced-by-bothrops-snake-venoms-using-specific-polyclonal-anti-bnsp7-antibodies
#17
Lamartine L Melo, Mirian M Mendes, Lívia M Alves, Thais F Isabel, Sâmela A P B Vieira, Sarah N C Gimenes, Andreimar M Soares, Veridiana M Rodrigues, Luiz F M Izidoro
Polyclonal antibodies raised in Balb-c mice against BnSP-7, a Lys-49 phospholipase A2, were used to measure cross reactivity against other snake venoms. Using ELISA, these antibodies were able to recognize PLA2s isoforms present in venoms of botropic snakes at 1:6400, 1:3200 and 1:100 ratios (w/w). These antibodies highly recognized proteins of low molecular weight (∼14,000) from crude snake venom Bp and Bm by Western Blotting. PLA2 these venoms, by alignment of primary structures demonstrated high identity with BnSP-7 PLA2, especially in the C-terminal region...
August 16, 2017: Biologicals: Journal of the International Association of Biological Standardization
https://www.readbyqxmd.com/read/28808157/cytosolic-phospholipase-a2%C3%AE-promotes-pulmonary-inflammation-and-systemic-disease-during-streptococcus-pneumoniae-infection
#18
Rudra Bhowmick, Stacie Clark, Joseph V Bonventre, John M Leong, Beth A McCormick
Pulmonary infection by Streptococcus pneumoniae is characterized by a robust alveolar infiltration of neutrophils (polymorphonuclear cells or PMNs) that can promote systemic spread of the infection if not resolved. We previously showed that 12-lipoxygenase (12-LOX), which is required to generate the PMN chemoattractant hepoxilin A3 (HXA3) from arachidonic acid (AA), promotes acute pulmonary inflammation and systemic infection after lung challenge with S. pneumoniae As phospholipase A2 (PLA2) promotes the release of AA, we investigated the role of PLA2 in local and systemic disease during S...
August 14, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28803982/specific-inhibition-of-xenorhabdus-hominickii-an-entomopathogenic-bacterium-against-different-types-of-host-insect-phospholipase-a2
#19
Md Sadekuzzaman, Yonggyun Kim
Phospholipase A2 (PLA2) hydrolyzes ester bond of phospholipids at the sn-2 position to release free fatty acid and lysophospholipids. Some PLA2s preferentially release arachidonic acid which is subsequently oxygenated into eicosanoids to mediate immune responses in insects. Xenorhabdus hominickii is an entomopathogenic bacterium that can suppress insect immunity by inhibiting PLA2 activity. However, little is known about target PLA2 types inhibited by X. hominickii. Therefore, the objective of this study was to determine PLA2 types in the host insect, Spodoptera exigua using specific inhibitors...
August 10, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/28794177/discovery-and-validation-of-a-six-marker-serum-protein-signature-for-the-diagnosis-of-active-pulmonary-tuberculosis
#20
Mary A De Groote, David G Sterling, Thomas Hraha, Theresa Russell, Louis S Green, Kirsten Wall, Stephan Kraemer, Rachel Ostroff, Nebojsa Janjic, Urs A Ochsner
New non-sputum biomarker tests for active tuberculosis (TB) diagnostics are of highest priority for global TB control. We performed in-depth proteomic analysis using the 4000-plex SOMAscan assay on 1470 serum samples from seven TB-endemic countries. All samples were from patients with symptoms and signs suggestive of active pulmonary TB that were systematically confirmed or ruled-out for TB by culture and clinical follow-up. HIV-coinfection was present in 34%and 22% were sputum smear-negative. Serum protein biomarkers were identified by stability selection using L1-regularized logistic regression and by Kolmogorov-Smirnov (KS) statistics...
August 9, 2017: Journal of Clinical Microbiology
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