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15 lipoxygenase

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https://www.readbyqxmd.com/read/28182779/o-prenylated-3-carboxycoumarins-as-a-novel-class-of-15-lox-1-inhibitors
#1
Atena Jabbari, Mina Mousavian, Seyed Mohamad Seyedi, Mehdi Bakavoli, Hamid Sadeghian
Allyloxy, Isopentenyloxy, geranyloxy and farnesyloxy derivatives of 3-carboxycoumarin, at position 5, 6, 7, and 8, were synthesized and their inhibitory potency against human 15-lipoxygenase-1 (human 15-LOX-1) were determined. Among the synthetic coumarins, O-allyl and O-isopentenyl derivatives demonstrated no considerable lipoxygenase inhibition while O-geranyl and O-farnesyl derivatives demonstrated potent inhibitory activity. 5-farnesyloxy-3-carboxycoumarin demonstrated the most potent inhibitory activity by IC50 = 0...
2017: PloS One
https://www.readbyqxmd.com/read/28129739/itraq-based-protein-profiling-and-fruit-quality-changes-at-different-development-stages-of-oriental-melon
#2
Xiaoou Guo, Jingjing Xu, Xiaohui Cui, Hao Chen, Hongyan Qi
BACKGROUND: Oriental melon is one of the most popular crops for its nutritional and flavour quality. Components that determine melon quality, such as sugar, colour, texture, flavour and aroma, among other factors, accumulate in different developmental stages. Thus, correlating the proteomic profiles with the biochemical and physiological changes occurring in the oriental melon is very important for advancing our understanding of oriental melon quality in the ripening processes. RESULTS: iTRAQ-based protein profiling was conducted on 'YuMeiren' oriental melon fruit at different developmental stages...
January 28, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/28104103/comparative-proteomic-analysis-of-bleomycin-induced-pulmonary-fibrosis-based-on-isobaric-tag-for-quantitation
#3
Tiejun Yang, Yanlong Jia, Yongkang Ma, Liang Cao, Xiaobing Chen, Baoping Qiao
BACKGROUND: Pulmonary fibrosis (PF) is a destructive pulmonary disease and the molecular mechanisms underlying PF are unclear. This study investigated differentially expressed proteins associated with the occurrence and development of PF in rat lung tissue with bleomycin-induced PF. METHODS: Sixteen Sprague-Dawley rats were randomly divided into 2 groups: the PF model group (n = 8) and the control group (n = 8). After successfully establishing the rat PF model induced by bleomycin, the differentially expressed proteins in the 2 groups were identified through isobaric tag for relative and absolute quantitation coupled with liquid chromatography-mass spectrometry and bioinformatics analysis...
January 2017: American Journal of the Medical Sciences
https://www.readbyqxmd.com/read/28101475/anticonvulsive-effects-of-licofelone-on-status-epilepticus-induced-by-lithium-pilocarpine-in-wistar-rats-a-role-for-inducible-nitric-oxide-synthase
#4
Seyyed Majid Eslami, Mohammad Mobin Moradi, Mehdi Ghasemi, Ahmad Reza Dehpour
BACKGROUND AND PURPOSE: Status epilepticus (SE) is a neurological disorder with high prevalence and mortality rates, requiring immediate intervention. Licofelone is a cyclooxygenase (COX) and 5-lipoxygenase (5-LOX) inhibitor, which its effectiveness to treat osteoarthritis has been approved. Increasing evidence suggests an involvement of COX and LOX enzymes in epileptic disorders. Thus, in the present study we investigate possible effects of licofelone on prevention and termination of SE...
December 2016: Journal of Epilepsy Research
https://www.readbyqxmd.com/read/28096231/roles-of-5-lipoxygenase-and-cyclooxygenase-2-in-the-biosynthesis-of-hemiketals-e2-and-d2-by-activated-human-leukocytes
#5
Juan A Giménez-Bastida, Takahiro Shibata, Koji Uchida, Claus Schneider
The 2 hemiketal (HK) eicosanoids HKD2 and HKE2 are the major products of the biosynthetic crossover of the 5-lipoxygenase (5-LOX) and cyclooxygenase-2 (COX-2) pathways. HKs result from the rearrangement of a di-endoperoxide intermediate formed in the COX-2-dependent oxygenation of 5S-hydroxyeicosatetraenoic acid (5S-HETE). We analyzed HK biosynthesis in human leukocytes stimulated ex vivo and defined the biosynthetic roles of 5-LOX and COX-2, using inhibitors and incubations with exogenous substrates. Activation of leukocytes with LPS followed by treatment with the calcium ionophore A23187 resulted in the formation of PGE2, 5-HETE, and LTB4 as the principal metabolites of COX-2 and 5-LOX, respectively...
January 17, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28089732/alox15-as-a-suppressor-of-inflammation-and-cancer-lost-in-the-link
#6
REVIEW
Rui Tian, Xiangsheng Zuo, Jonathan Jaoude, Fei Mao, Jennifer Colby, Imad Shureiqi
Mounting evidence supports a mechanistic link between inflammation and cancer, especially colon cancer. ALOX15 (15-lipoxygenase-1) plays an important role in the formation of key lipid mediators (e.g., lipoxins and resolvins) to terminate inflammation. ALOX15 expression is downregulated in colorectal cancer (CRC). Intestinally-targeted transgenic expression of ALOX15 in mice inhibited dextran sodium sulfate-induced colitis from promoting azoxymethane- induced colorectal tumorigenesis, demonstrating that ALOX15 can suppress inflammation-driven promotion of carcinogen-induced colorectal tumorigenesis and therefore ALOX15 downregulation during tumorigenesis is likely to enhance the link between colitis and colorectal tumorigenesis...
January 12, 2017: Prostaglandins & Other Lipid Mediators
https://www.readbyqxmd.com/read/28062072/two-rare-antioxidant-and-anti-inflammatory-oleanenes-from-loop-root-asiatic-mangrove-rhizophora-mucronata
#7
Kajal Chakraborty, Vamshi Krishna Raola
Two oleanenes, olean-18(19)-en-3β-yl-(3,6-dimethyl-3E,6Z-dienoate) and (13α)-27-frido-olean-14(15)-en-(17α)-furanyl-3β-ol representing a class of rare natural pentacyclic triterpenoids were isolated from the chloroform extract of Asiatic mangrove, Rhizophora mucronata Lam. (Family: Rhizophoraceae). The furanyl oleanene exhibited significantly greater antioxidative activities (IC50 0.73-0.76 mg/mL), than prenylated oleanene (IC50 0.84-0.96 mg/mL) (P < 0.05). No significant differences in anti-5-lipoxygenase activities of these compounds with the synthetic drug ibuprofen was discernable (IC50 0...
March 2017: Phytochemistry
https://www.readbyqxmd.com/read/28057806/12-15-lipoxygenase-inhibition-or-knockout-reduces-warfarin-associated-hemorrhagic-transformation-after-experimental-stroke
#8
Yu Liu, Yi Zheng, Hulya Karatas, Xiaoying Wang, Christian Foerch, Eng H Lo, Klaus van Leyen
BACKGROUND AND PURPOSE: For stroke prevention, patients with atrial fibrillation typically receive oral anticoagulation. The commonly used anticoagulant warfarin increases the risk of hemorrhagic transformation (HT) when a stroke occurs; tissue-type plasminogen activator treatment is therefore restricted in these patients. This study was designed to test the hypothesis that 12/15-lipoxygenase (12/15-LOX) inhibition would reduce HT in warfarin-treated mice subjected to experimental stroke...
February 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28024685/decreases-in-15-lipoxygenase-metabolites-in-olmsted-syndrome-model-rats
#9
Masato Wakabayashi, Takeshi Yoshioka, Kenichi Higashino, Yoshito Numata, Yasuyuki Igarashi, Akio Kihara
BACKGROUND: Olmsted syndrome (OS) is a congenital dermatosis characterized by palmoplantar keratoderma and periorificial keratotic plaque. TRPV3 (transient receptor potential vanilloid subtype 3) encodes a thermosensitive Ca(2+) channel and is the causative gene of OS. However, the molecular mechanism that causes the pathological development of OS is unclear. OBJECTIVE: We aimed to investigate the molecular mechanisms underlying OS pathology from the perspective of lipid metabolism...
December 15, 2016: Journal of Dermatological Science
https://www.readbyqxmd.com/read/27993857/simvastatin-attenuates-endothelial-activation-through-15-epi-lipoxin-a4-production-in-murine-chronic-chagas-cardiomyopathy
#10
Fabiola González-Herrera, Allysson Cramer, Pollyana Pimentel, Christian Castillo, Ana Liempi, Ulrike Kemmerling, Fabiana S Machado, Juan D Maya
Current treatments for chronic Chagas cardiomyopathy, a disease with high mortality rates and caused by the protozoan Trypanosoma cruzi, are unsatisfactory. Myocardial inflammation, including endothelial activation, is responsible for the structural and functional damage seen in the chronic phase. The clinical efficacy of benznidazole could be improved by decreasing chronic inflammation. Statins, which have anti-inflammatory properties, may improve the action of benznidazole. Herein, the action of simvastatin in a murine model of chronic Chagas cardiomyopathy and the link with the production of the pro-resolving eicosanoid 15-epi-lipoxin A4, produced by 5-lipoxygenase, are evaluated...
December 19, 2016: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27916650/cardiac-oxidative-stress-in-diabetes-mechanisms-and-therapeutic-potential
#11
REVIEW
Alyssa Faria, Shanta J Persaud
Macrovascular complications of diabetes, including diabetic cardiovascular disease (CVD), occur through a number of hyperglycaemia-induced mechanisms that include generation of oxidative stress, accumulation of advanced glycation end-products (AGE) and activation of protein kinase C (PKC). Cardiac oxidative stress is associated with increased cardiac fibrosis and hypertrophy, and reduced cardiac performance and contractility, leading to severe cardiac dysfunction and potentially fatal cardiac events. It occurs under conditions of excessive synthesis of reactive oxygen species (ROS)...
December 1, 2016: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/27893755/quantification-of-arachidonic-acid-and-its-metabolites-in-rat-tissues-by-uhplc-ms-ms-application-for-the-identification-of-potential-biomarkers-of-benign-prostatic-hyperplasia
#12
Qiaoxia Bian, Weihui Wang, Nannan Wang, Yan Peng, Wen Ma, Ronghua Dai
To evaluate the potential relationship between benign prostatic hyperplasia (BPH) and the arachidonic acid (AA) metabolome, a UHPLC-MS/MS method has been developed and validated for simultaneous determination of AA and its cyclooxygenase(COX) and lipoxygenase(LOX) pathway metabolites (15-HETE, 12-HETE, TXA2, 5-HETE, AA, PGI2, PGF2α, 8-HETE, PGD2, PGE2 and LTB4) in rat tissues. The analytes were extracted from tissue samples with a protein precipitation procedure and then separated on a Shim-pack XR-ODSC18 column with 0...
2016: PloS One
https://www.readbyqxmd.com/read/27836541/substituted-e-2-2-benzylidenehydrazinyl-4-methylthiazole-5-carboxylates-as-dual-inhibitors-of-15-lipoxygenase-carbonic-anhydrase-ii-synthesis-biochemical-evaluation-and-docking-studies
#13
Aamer Saeed, Shafi Ullah Khan, Parvez Ali Mahesar, Pervaiz Ali Channar, Ghulam Shabir, Jamshed Iqbal
15-Lipoxygenase (15-LOX) plays a major role in many inflammatory lung diseases including chronic obstructive pulmonary disease (COPD), asthma and chronic bronchitis. Over-expression of 15-LOX is related with some specific carcinomas including pancreatic, gastric and brain tumor. Similarly among different isozymes of carbonic anhydrase (CA), CA II is expressed in pancreatic, gastric carcinomas as well as in brain tumors. Therefore, novel potent inhibitors of both 15-LOX and CA II are required to explore the role of these enzymes further and to enable the drug discovery efforts...
January 1, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27832777/a-proteomic-analysis-of-acute-leukemia-cells-treated-with-9-hydroxyoctadecadienoic-acid
#14
Zhen Li, Bohong Chen, Ping Wang, Xin Li, Gaotai Cai, Wei Wei, Wenqi Dong
BACKGROUND: 9s-hydroxy-octadecadienoic acid (9S-HOD), one of the natural products of linoleic acid oxygenation by 15-lipoxygenase (15-LOX), has been found to have anti-tumor properties in vitro and in vivo. The present study therefore investigated whether 9S-HOD affects acute leukemia HL-60 cells. METHODS: The cytotoxicity of 9S-HOD in HL-60 with or without the presence of fetal bovine serum (FBS) in the culture media was tested using cell viability assays and flow cytometry...
November 10, 2016: Lipids in Health and Disease
https://www.readbyqxmd.com/read/27826169/esculetin-reduces-leukotriene-b4-level-in-plasma-of-rats-with-adjuvant-induced-arthritis
#15
Przemysław Rzodkiewicz, Emilia Gąsińska, Michał Gajewski, Magdalena Bujalska-Zadrożny, Dariusz Szukiewicz, Sławomir Maśliński
OBJECTIVES: Esculetin (6,7-dihydroxycoumarin) is a natural coumarin with anti-oxidant, anti-inflammatory and anti-nociceptive activity. It acts as a potent inhibitor of lipoxygenases (5-LOX and 12-LOX) and decreases the production of matrix metalloproteinases (MMP-1, MMP-3 and MMP-9). Because both inhibition of lipoxygenases and inhibition of matrix metalloproteinases are effective strategies in the treatment of rheumatoid arthritis, we investigated whether esculetin may be effective in adjuvant-induced arthritis in rats...
2016: Reumatologia
https://www.readbyqxmd.com/read/27825104/human-15-lipoxygenase-1-is-a-regulator-of-dendritic-cell-spreading-and-podosome-formation
#16
Hongya Han, Xiuming Liang, Monica Ekberg, Joanna S Kritikou, Åsa Brunnström, Benjamin Pelcman, Maria Matl, Xinyan Miao, Margareta Andersson, Xiaotian Yuan, Frida Schain, Selina Parvin, Eva Melin, Jan Sjöberg, Dawei Xu, Lisa S Westerberg, Magnus Björkholm, Hans-Erik Claesson
Dendritic cells (DCs) involved in proinflammatory immune responses derive mainly from peripheral monocytes, and the cells subsequently mature and migrate into the inflammatory micromilieu. Here we report that suppressing of 15-lipoxygenase-1 led to a substantial reduction in DC spreading and podosome formation in vitro. The surface expression of CD83 was significantly lower in both sh-15-lipoxygenase-1 (15-LOX-1)-transduced cells and DCs cultivated in the presence of the inhibitor. The T-cell response against tetanus-pulsed DCs was only affected to a minor extent on inhibition of 15-LOX-1...
October 17, 2016: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/27818578/apoptosis-of-endothelial-cells-by-13-hpode-contributes-to-impairment-of-endothelial-barrier-integrity
#17
Valerie E Ryman, Nandakumar Packiriswamy, Lorraine M Sordillo
Inflammation is an essential host response during bacterial infections such as bovine mastitis. Endothelial cells are critical for an appropriate inflammatory response and loss of vascular barrier integrity is implicated in the pathogenesis of Streptococcus uberis-induced mastitis. Previous studies suggested that accumulation of linoleic acid (LA) oxygenation products derived from 15-lipoxygenase-1 (15-LOX-1) metabolism could regulate vascular functions. The initial LA derivative from the 15-LOX-1 pathway, 13-hydroperoxyoctadecadienoic acid (HPODE), can induce endothelial death, whereas the reduced hydroxyl product, 13-hydroxyoctadecadienoic acid (HODE), is abundantly produced during vascular activation...
2016: Mediators of Inflammation
https://www.readbyqxmd.com/read/27814242/neonatal-cord-blood-oxylipins-and-exposure-to-particulate-matter-in-the-early-life-environment-an-environage-birth-cohort-study
#18
Dries S Martens, Sandra Gouveia, Narjes Madhloum, Bram G Janssen, Michelle Plusquin, Charlotte Vanpoucke, Wouter Lefebvre, Bertil Forsberg, Malin Nording, Tim S Nawrot
BACKGROUND: As part of the lipidome, oxylipins are bioactive lipid compounds originating from oxidation of different fatty acids. Oxylipins could provide a new target in the developmental origins model or the ability of early life exposure to change biology. OBJECTIVES: We studied the association between in utero PM2.5 (particulate matter with aerodynamic diameter <2.5µm) exposure and oxylipin profiles in newborns. METHODS: Thirty-seven oxylipins reflecting the cyclooxygenase (COX), lipoxygenase (5-LOX and 12/15-LOX) and cytochrome P450 (CYP) pathways were assayed in 197 cord blood plasma samples from the ENVIRONAGE birth cohort...
November 4, 2016: Environmental Health Perspectives
https://www.readbyqxmd.com/read/27802026/magnetic-microbead-affinity-selection-screening-magmass-of-botanical-extracts-for-inhibitors-of-15-lipoxygenase
#19
Michael D Rush, Elisabeth M Walker, Tristesse Burton, Richard B van Breemen
To expedite the identification of active natural products in complex mixtures such as botanical extracts, a magnetic microbead affinity selection screening (MagMASS) procedure was developed. This technique utilizes target proteins immobilized on magnetic beads for rapid bioaffinity isolation of ligands from complex mixtures. A MagMASS method was developed and validated for 15-lipoxygenase. As a proof of concept, several North American prairie plants used medicinally by Native Americans were extracted with MeOH and screened...
November 23, 2016: Journal of Natural Products
https://www.readbyqxmd.com/read/27777380/aging-dysregulates-d-and-e-series-resolvins-to-modulate-cardiosplenic-and-cardiorenal-network-following-myocardial-infarction
#20
Ganesh V Halade, Vasundhara Kain, Laurence M Black, Sumanth D Prabhu, Kevin A Ingle
Post-myocardial infarction (MI), overactive inflammation is the hallmark of aging, however, the mechanism is unclear. We hypothesized that excess influx of omega 6 fatty acids may impair resolution, thus impacting the cardiosplenic and cardiorenal network post-MI. Young and aging mice were fed on standard lab chow (LC) and excess fatty acid (safflower oil; SO)-enriched diet for 2 months and were then subjected to MI surgery. Despite similar infarct areas and left ventricle (LV) dysfunction post-MI, splenic mass spectrometry data revealed higher levels of arachidonic acid (AA) derived pro-inflammatory metabolites in young-SO, but minimal formation of docosanoids, D- and E- series resolvins in SO-fed aged mice...
October 18, 2016: Aging
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