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lysophosphatidylinositol

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https://www.readbyqxmd.com/read/28323975/muscle-sympathetic-nerve-activity-is-associated-with-elements-of-the-plasma-lipidomic-profile-in-young-asian-adults
#1
Nina Eikelis, Elisabeth A Lambert, Sarah Phillips, Carolina Ika Sari, Piyushkumar A Mundra, Jacquelyn M Weir, Kevin Huynh, Mariee T Grima, Nora E Straznicky, John B Dixon, Markus P Schlaich, Peter J Meikle, Gavin W Lambert
Background: Asian subjects are at increased cardio-metabolic risk at comparatively lower BMI compared with Caucasians. Sympathetic nervous system activation and dyslipidaemia, both characteristics of increased adiposity, appear to be related. We therefore analysed the association of muscle sympathetic nerve activity (MSNA) with the plasma lipidomic profile in young Asian and Caucasian subjects. Methods: Blood samples were collected from 101 participants of either Asian or Caucasian background, aged 18-30, BMI 28...
March 15, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28297799/-a-serum-lipidomic-study-of-patients-with-non-alcoholic-fatty-liver-disease
#2
R X Yang, C X Hu, Y Q Mi, W L Sun, G Y Chen, Q Pan, F Shen, G W Xu, J G Fan
Objective: To investigate the serum lipidomic profile in patients with nonalcoholic fatty liver disease (NAFLD), and to analyze the lipid metabolism characteristics of NAFLD. Methods: The subjects were divided into control group (23 patients) and pathologically confirmed NAFLD group (42 patients), and ultra-high-performance liquid chromatography-tandem mass spectrometry was used to measure serum lipidomic metabolites. The partial least squares-discriminant analysis (PLS-DA) model was established to analyze the differences in lipid metabolism with reference to the univariate analysis...
February 20, 2017: Zhonghua Gan Zang Bing za Zhi, Zhonghua Ganzangbing Zazhi, Chinese Journal of Hepatology
https://www.readbyqxmd.com/read/28291223/liver-specific-deletion-of-the-plpp3-gene-alters-plasma-lipid-composition-and-worsens-atherosclerosis-in-apoe-mice
#3
Marco Busnelli, Stefano Manzini, Mika Hilvo, Cinzia Parolini, Giulia S Ganzetti, Federica Dellera, Kim Ekroos, Minna Jänis, Diana Escalante-Alcalde, Cesare R Sirtori, Reijo Laaksonen, Giulia Chiesa
The PLPP3 gene encodes for a ubiquitous enzyme that dephosphorylates several lipid substrates. Genome-wide association studies identified PLPP3 as a gene that plays a role in coronary artery disease susceptibility. The aim of the study was to investigate the effect of Plpp3 deletion on atherosclerosis development in mice. Because the constitutive deletion of Plpp3 in mice is lethal, conditional Plpp3 hepatocyte-specific null mice were generated by crossing floxed Plpp3 mice with animals expressing Cre recombinase under control of the albumin promoter...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28196832/gpr55-a-new-promising-target-for-metabolism
#4
REVIEW
Eva Tudurí, Monica Imbernon, Rene Javier Hernández-Bautista, Marta Tojo, Johan Fernø, Carlos Diéguez, Rubén Nogueiras
GPR55 is a G-protein-coupled receptor (GPCR) that has been identified as a new cannabinoid receptor. Given the wide localization of GPR55 in brain and peripheral tissues, this receptor has emerged as a regulator of multiple biological actions. Lysophosphatidylinositol (LPI) is generally accepted as the endogenous ligand of GPR55. In this review, we will focus on the role of GPR55 in energy balance and glucose metabolism. We will summarize its actions on feeding, nutrient partitioning, gastrointestinal motility and insulin secretion in preclinical models and the scarce data available in humans...
April 2017: Journal of Molecular Endocrinology
https://www.readbyqxmd.com/read/28067430/exogenous-lysophospholipids-with-large-head-groups-perturb-clathrin-mediated-endocytosis
#5
Ieva Ailte, Anne Berit D Lingelem, Audun S Kvalvaag, Simona Kavaliauskiene, Andreas Brech, Gerbrand Koster, Paul G Dommersnes, Jonas Bergan, Tore Skotland, Kirsten Sandvig
In this study, we have investigated how clathrin-dependent endocytosis is affected by exogenously added lysophospholipids (LPLs). Addition of LPLs with large head groups strongly inhibits transferrin (Tf) endocytosis in various cell lines, while LPLs with small head groups do not. Electron and total internal reflection fluorescence microscopy (EM and TIRF) reveal that treatment with lysophosphatidylinositol (LPI) with the fatty acyl group C18:0 leads to reduced numbers of invaginated clathrin-coated pits (CCPs) at the plasma membrane, fewer endocytic events per membrane area and increased lifetime of CCPs...
March 2017: Traffic
https://www.readbyqxmd.com/read/28064014/gpr55-agonist-lysophosphatidylinositol-and-lysophosphatidylcholine-inhibit-endothelial-cell-hyperpolarization-via-gpr-independent-suppression-of-na-ca-2-exchanger-and-endoplasmic-reticulum-ca-2-refilling
#6
Alexander I Bondarenko, Fabrizio Montecucco, Olga Panasiuk, Vadim Sagach, Nataliya Sidoryak, Karim J Brandt, François Mach
Lysophosphatidylinositol (LPI) and lysophosphatidylcholine (LPC) are lipid signaling molecules that induce endothelium-dependent vasodilation. In addition, LPC suppresses acetylcholine (Ach)-induced responses. We aimed to determine the influence of LPC and LPI on hyperpolarizing responses in vitro and in situ endothelial cells (EC) and identify the underlying mechanisms. Using patch-clamp method, we show that LPI and LPC inhibit EC hyperpolarization to histamine and suppress Na(+)/Ca(2+) exchanged (NCX) currents in a concentration-dependent manner...
January 5, 2017: Vascular Pharmacology
https://www.readbyqxmd.com/read/28029647/peptide-guided-targeting-of-gpr55-for-anti-cancer-therapy
#7
Maria Mangini, Enrico Iaccino, Maria Giovanna Mosca, Selena Mimmi, Rosa D'Angelo, Ileana Quinto, Giuseppe Scala, Stefania Mariggiò
Expression of the lysophosphatidylinositol receptor GPR55 correlates with invasive potential of metastatic cells and bone metastasis formation of different types of tumors. These findings suggest a role for GPR55 signaling in cancer progression, including in lymphoproliferative diseases. Here, we screened a M13-phage-displayed random library using the bait of HEK293 cells that heterologously expressed full-length HA-GPR55. We selected a set of phagotopes that carried 7-mer insert peptides flanked by a pair of cysteine residues, which resulted in cyclized peptides...
December 23, 2016: Oncotarget
https://www.readbyqxmd.com/read/28007846/different-origins-of-lysophospholipid-mediators-between-coronary-and-peripheral-arteries-in-acute-coronary-syndrome
#8
Makoto Kurano, Kuniyuki Kano, Tomotaka Dohi, Hirotaka Matsumoto, Koji Igarashi, Masako Nishikawa, Ryunosuke Ohkawa, Hitoshi Ikeda, Katsumi Miyauchi, Hiroyuki Daida, Junken Aoki, Yutaka Yatomi
Lysophosphatidic acids (LysoPAs) and lysophosphatidylserine (LysoPS) are emerging lipid mediators proposed to be involved in the pathogenesis of acute coronary syndrome (ACS). In this study, we attempted to elucidate how LysoPA and LysoPS become elevated in ACS using human blood samples collected simultaneously from culprit coronary arteries and peripheral arteries in ACS subjects. We found that: 1) the plasma LysoPA, LysoPS, and lysophosphatidylglycerol levels were not different, while the lysophosphatidylcholine (LysoPC), lysophosphatidylinositol, and lysophosphatidylethanolamine (LysoPE) levels were significantly lower in the culprit coronary arteries; 2) the serum autotaxin (ATX) level was lower and the serum phosphatidylserine-specific phospholipase A1 (PS-PLA1) level was higher in the culprit coronary arteries; 3) the LysoPE and ATX levels were significant explanatory factors for the mainly elevated species of LysoPA, except for 22:6 LysoPA, in the peripheral arteries, while the LysoPC and LysoPE levels, but not the ATX level, were explanatory factors in the culprit coronary arteries; and 4) 18:0 and 18:1 LysoPS were significantly correlated with PS-PLA1 only in the culprit coronary arteries...
February 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28005346/identification-of-crucial-amino-acid-residues-involved-in-agonist-signaling-at-the-gpr55-receptor
#9
Mary A Lingerfelt, Pingwei Zhao, Haleli P Sharir, Dow P Hurst, Patricia H Reggio, Mary E Abood
GPR55 is a newly deorphanized class A G-protein-coupled receptor that has been implicated in inflammatory pain, neuropathic pain, metabolic disorder, bone development, and cancer. Few potent GPR55 ligands have been identified to date. This is largely due to an absence of information about salient features of GPR55, such as residues important for signaling and residues implicated in the GPR55 signaling cascade. The goal of this work was to identify residues that are key for the signaling of the GPR55 endogenous ligand, l-α-lysophosphatidylinositol (LPI), as well as the signaling of the GPR55 agonist, ML184 {CID 2440433, 3-[4-(2,3-dimethylphenyl)piperazine-1-carbonyl]-N,N-dimethyl-4-pyrrolidin-1-ylbenzenesulfonamide}...
January 24, 2017: Biochemistry
https://www.readbyqxmd.com/read/27941994/deletion-of-gpr55-results-in-subtle-effects-on-energy-metabolism-motor-activity-and-thermal-pain-sensation
#10
Mikael Bjursell, Erik Ryberg, Tingting Wu, Peter J Greasley, Mohammad Bohlooly-Y, Stephan Hjorth
The G-protein coupled receptor 55 (GPR55) is activated by cannabinoids and non-cannabinoid molecules and has been speculated to play a modulatory role in a large variety of physiological and pathological processes, including in metabolically perturbed states. We therefore generated male mice deficient in the gene coding for the cannabinoid/lysophosphatidylinositol (LPI) receptor Gpr55 and characterized them under normal dietary conditions as well as during high energy dense diet feeding followed by challenge with the CB1 receptor antagonist/GPR55 agonist rimonabant...
2016: PloS One
https://www.readbyqxmd.com/read/27940403/markers-of-sympathetic-nervous-system-activity-associate-with-complex-plasma-lipids-in-metabolic-syndrome-subjects
#11
Paul J Nestel, Anmar A Khan, Nora E Straznicky, Natalie A Mellett, Kaushala Jayawardana, Piyushkumar A Mundra, Gavin W Lambert, Peter J Meikle
BACKGROUND AND AIMS: Plasma sphingolipids including ceramides, and gangliosides are associated with insulin resistance (IR) through effects on insulin signalling and glucose metabolism. Our studies of subjects with metabolic syndrome (MetS) showed close relationships between IR and sympathetic nervous system (SNS) activity including arterial norepinephrine (NE). We have therefore investigated possible associations of IR and SNS activity with complex lipids that are involved in both insulin sensitivity and neurotransmission...
January 2017: Atherosclerosis
https://www.readbyqxmd.com/read/27881714/a-gpi-processing-phospholipase-a2-pgap6-modulates-nodal-signaling-in-embryos-by-shedding-cripto
#12
Gun-Hee Lee, Morihisa Fujita, Katsuyoshi Takaoka, Yoshiko Murakami, Yoshitaka Fujihara, Noriyuki Kanzawa, Kei-Ichi Murakami, Eriko Kajikawa, Yoko Takada, Kazunobu Saito, Masahito Ikawa, Hiroshi Hamada, Yusuke Maeda, Taroh Kinoshita
Glycosylphosphatidylinositol-anchored proteins (GPI-APs) can be shed from the cell membrane by GPI cleavage. In this study, we report a novel GPI-processing enzyme, termed post-glycosylphosphatidylinositol attachment to proteins 6 (PGAP6), which is a GPI-specific phospholipase A2 mainly localized at the cell surface. CRIPTO, a GPI-AP, which plays critical roles in early embryonic development by acting as a Nodal coreceptor, is a highly sensitive substrate of PGAP6, whereas CRYPTIC, a close homologue of CRIPTO, is not sensitive...
December 5, 2016: Journal of Cell Biology
https://www.readbyqxmd.com/read/27879158/potential-of-lysophosphatidylinositol-as-a-prognostic-indicator-of-cardiac-arrest-using-a-rat-model
#13
Junhwan Kim, Tai Yin, Koichiro Shinozaki, Joshua W Lampe, Lance B Becker
AIMS: The potential of a lysophosphatidylinositol species, LPI(18:0), as a biomarker of ischaemia was tested using a rat model of cardiac arrest (CA). METHODS: Male Sprague-Dawley rats were subjected to asphyxia-induced CA or CA followed by cardiopulmonary bypass (CPB) resuscitation. The brain, heart, kidney and liver tissues were harvested from rats after 0, 5, 10, 20, 30 and 60 min CA and 30 min CA followed by 60 min CPB resuscitation. Blood samples were collected from inferior vena cava and hepatic veins following 30 min CA...
December 8, 2016: Biomarkers: Biochemical Indicators of Exposure, Response, and Susceptibility to Chemicals
https://www.readbyqxmd.com/read/27616480/mutations-in-mboat7-encoding-lysophosphatidylinositol-acyltransferase-i-lead-to-intellectual-disability-accompanied-by-epilepsy-and-autistic-features
#14
Anide Johansen, Rasim O Rosti, Damir Musaev, Evan Sticca, Ricardo Harripaul, Maha Zaki, Ahmet Okay Çağlayan, Matloob Azam, Tipu Sultan, Tawfiq Froukh, André Reis, Bernt Popp, Iltaf Ahmed, Peter John, Muhammad Ayub, Tawfeg Ben-Omran, John B Vincent, Joseph G Gleeson, Rami Abou Jamra
The risk of epilepsy among individuals with intellectual disability (ID) is approximately ten times that of the general population. From a cohort of >5,000 families affected by neurodevelopmental disorders, we identified six consanguineous families harboring homozygous inactivating variants in MBOAT7, encoding lysophosphatidylinositol acyltransferase (LPIAT1). Subjects presented with ID frequently accompanied by epilepsy and autistic features. LPIAT1 is a membrane-bound phospholipid-remodeling enzyme that transfers arachidonic acid (AA) to lysophosphatidylinositol to produce AA-containing phosphatidylinositol...
October 6, 2016: American Journal of Human Genetics
https://www.readbyqxmd.com/read/27561953/gpr55-dependent-stimulation-of-insulin-secretion-from-isolated-mouse-and-human-islets-of-langerhans
#15
Bo Liu, Shuang Song, Inmaculada Ruz-Maldonado, Attilio Pingitore, Guo C Huang, David Baker, Peter M Jones, Shanta J Persaud
AIMS: The novel cannabinoid receptor GPR55 is expressed by rodent islets and it has been implicated in β-cell function in response to a range of ligands. This study evaluated the effects of GPR55 ligands on intracellular calcium ([Ca(2+) ]i ) levels and insulin secretion from islets isolated from GPR55 knockout (GPR55 (-/-) ) mice, age-matched wildtype (WT) mice and human pancreas. MATERIALS AND METHODS: GPR55 expression was determined by Western blotting and fluorescent immunohistochemistry...
December 2016: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/27514531/metabolic-signatures-and-risk-of-type-2-diabetes-in-a-chinese-population-an-untargeted-metabolomics-study-using-both-lc-ms-and-gc-ms
#16
Yonghai Lu, Yeli Wang, Choon-Nam Ong, Tavintharan Subramaniam, Hyung Won Choi, Jian-Min Yuan, Woon-Puay Koh, An Pan
AIMS/HYPOTHESIS: Metabolomics has provided new insight into diabetes risk assessment. In this study we characterised the human serum metabolic profiles of participants in the Singapore Chinese Health Study cohort to identify metabolic signatures associated with an increased risk of type 2 diabetes. METHODS: In this nested case-control study, baseline serum metabolite profiles were measured using LC-MS and GC-MS during a 6-year follow-up of 197 individuals with type 2 diabetes but without a history of cardiovascular disease or cancer before diabetes diagnosis, and 197 healthy controls matched by age, sex and date of blood collection...
November 2016: Diabetologia
https://www.readbyqxmd.com/read/27488130/advances-in-the-physiology-of-gpr55-in-the-central-nervous
#17
Bruno A Marichal-Cancino, Alfonso Fajardo-Valdéz, Alejandra E Ruiz-Contreras, Mónica Méndez-Díaz, Oscar Prospéro-García
The G protein-coupled receptor 55 (GPR55) is a mammalian orphan receptor whose functions in the central nervous system (CNS) have been scarcely elucidated. Several endogenous lipids (cannabinoids and non-cannabinoid) may activate GPR55; these facts have raised a discussion about its nature as a putative cannabinoid receptor. Lysophosphatidylinositol (LPI) is a non-endocannabinoid lipid with activity as a full and potent agonist of GPR55. Beyond this controversy, it is known the endocannabinoid system and GPR55 are highly related both in anatomical localization and function...
July 29, 2016: Current Neuropharmacology
https://www.readbyqxmd.com/read/27458147/addition-of-lysophospholipids-with-large-head-groups-to-cells-inhibits-shiga-toxin-binding
#18
Ieva Ailte, Anne Berit Dyve Lingelem, Simona Kavaliauskiene, Jonas Bergan, Audun Sverre Kvalvaag, Anne-Grethe Myrann, Tore Skotland, Kirsten Sandvig
Shiga toxin (Stx), an AB5 toxin, binds specifically to the neutral glycosphingolipid Gb3 at the cell surface before being transported into cells. We here demonstrate that addition of conical lysophospholipids (LPLs) with large head groups inhibit Stx binding to cells whereas LPLs with small head groups do not. Lysophosphatidylinositol (LPI 18:0), the most efficient LPL with the largest head group, was selected for in-depth investigations to study how the binding of Stx is regulated. We show that the inhibition of Stx binding by LPI is reversible and possibly regulated by cholesterol since addition of methyl-β-cyclodextrin (mβCD) reversed the ability of LPI to inhibit binding...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27340777/activation-of-the-orphan-receptor-gpr55-by-lysophosphatidylinositol-promotes-metastasis-in-triple-negative-breast-cancer
#19
Clara Andradas, Sandra Blasco-Benito, Sonia Castillo-Lluva, Patricia Dillenburg-Pilla, Rebeca Diez-Alarcia, Alba Juanes-García, Elena García-Taboada, Rodrigo Hernando-Llorente, Joaquim Soriano, Sigrid Hamann, Antonia Wenners, Ibrahim Alkatout, Wolfram Klapper, Christoph Rocken, Maret Bauer, Norbert Arnold, Miguel Quintanilla, Diego Megías, Miguel Vicente-Manzanares, Leyre Urigüen, J Silvio Gutkind, Manuel Guzmán, Eduardo Pérez-Gómez, Cristina Sánchez
The orphan G protein-coupled receptor GPR55 has been directly or indirectly related to basic alterations that drive malignant growth: uncontrolled cancer cell proliferation, sustained angiogenesis, and cancer cell adhesion and migration. However, little is known about the involvement of this receptor in metastasis. Here, we show that elevated GPR55 expression in human tumors is associated with the aggressive basal/triple-negative breast cancer population, higher probability to develop metastases, and therefore poor patient prognosis...
July 26, 2016: Oncotarget
https://www.readbyqxmd.com/read/27326923/regioselective-phosphorylation-of-myo-inositol-with-binol-derived-phosphoramidites-and-its-application-for-protozoan-lysophosphatidylinositol
#20
Toshihiko Aiba, Masaki Sato, Daichi Umegaki, Takanori Iwasaki, Nobuaki Kambe, Koichi Fukase, Yukari Fujimoto
A regioselective phosphorylation method for myo-inositol was developed by utilizing readily preparable BINOL-derived phosphoramidites. The method also facilitated the complete separation of the diastereomeric products by simple chromatography. Based on this phosphorylation and Ni-catalyzed alkyl-alkyl cross-coupling reaction for long fatty acids, we achieved the first synthesis of a lysophosphatidylinositol, EhPIa having long fatty acid C30:1, as a partial structure of glycosylphosphatidylinositol (GPI) anchor from the cell membrane of a protozoa, Entamoeba histolytica...
July 12, 2016: Organic & Biomolecular Chemistry
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