lipoxygenase/zubní kaz

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15-Lipoxygenase-1 induced by interleukin-4 mediates apoptosis in oral cavity cancer cells.

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It is unknown whether IL-4 induces apoptosis in oral cavity cancer (OCC) cells and, if so, what the mediator of this apoptosis is. Therefore, this study investigated whether apoptosis of OCC cells is induced by IL-4 and whether 15-lipoxygenase-1 (15-LO-1), induced by IL-4, is the mediator of this

Effect of 5-lipoxygenase inhibitors on in situ LTB4 biosynthesis following calcium ionophore stimulation in the rat pleural cavity.

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The intrapleural injection of carrageenan in the rat induces exudate formation, cellular influx and leukotriene generation in the pleural cavity. We have demonstrated that the inflammatory response (exudate volume, and LTB4 levels) is increased in situ by the intrapleural administration of calcium

A comparison of the anti-inflammatory activity of selective 5-lipoxygenase inhibitors with dexamethasone and colchicine in a model of zymosan induced inflammation in the rat knee joint and peritoneal cavity.

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Intraperitoneal and intra-articular (knee joint) injection of zymosan in the rat caused two phases of increased vascular permeability, a rapid increase (0.25-0.5 h) and a secondary increase (2-3 h) which was temporally associated with the onset of leukocyte infiltration. Intraperitoneal injection of

Lipoxygenase activities of the epithelial cells of the human buccal cavity.

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The lipoxygenase activities of cultured human buccal epithelial cells and cells taken ex vivo from the human buccal cavity were compared. Lipoxygenation by cultured cells exhibited exclusively omega-6 positional specificity. A membrane-damaging event such as freezing was required for activation. In

[Effect of herba schizonepetae volatile oil (STO) on activity of 5-lipoxygenase in rat thoracic cavity leukocytes].

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OBJECTIVE To investigate the effect of herba schizonepetae volatile oil (STO) on the activity of 5-lipoxygenase (5-LO), so as to elucidate its mechanisms of anti-inflammatory action which is related to the arachidonic acid (AA) metabolism. METHODS Thoracic cavity leukocytes from the pleurisy model

Effect of crystal freezing and small-molecule binding on internal cavity size in a large protein: X-ray and docking studies of lipoxygenase at ambient and low temperature at 2.0 A resolution.

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Flash-freezing is a technique that is commonly used nowadays to collect diffraction data for X-ray structural analysis. It can affect both the crystal and molecular structure and the molecule's surface, as well as the internal cavities. X-ray structural data often serve as a template for the protein

Exploring surfaces and cavities in lipoxygenase and other proteins by hyperpolarized xenon-129 NMR.

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This paper presents an exploratory study of the binding interactions of xenon with the surface of several different proteins in the solution and solid states using both conventional and hyperpolarized (129)Xe NMR. The generation of hyperpolarized (129)Xe by spin exchange optical pumping affords an

Curcumin inhibits lipoxygenase by binding to its central cavity: theoretical and X-ray evidence.

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Many lipoxygenase inhibitors including curcumin are currently being studied for their anti-carcinogenic properties. Curcumin is a naturally occurring polyphenolic phytochemical isolated from the powdered rhizome of the plant Curcuma longa that possesses anti-inflammatory properties and inhibits

Enzyme selectivity of new cyclooxygenase-2/5 lipoxygenase inhibitors using molecular modeling approach.

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We have studied the conformational flexibility of three 5-keto-substituted 7-tert-butyl-2,3-dihydro-3,3-dimethylbenzofurans (DHDMBFs) which show dual cyclooxygenase (COX) and 5-lipoxygenase (LOX) inhibition and are potential candidates as antiinflammatory agents and analgesics. The conformations

Lipoxygenase Inhibitors Nordihydroguaiaretic Acid and Fungus Lecanicillum lecanii Extract Induce Death of Lymphoid Leukemia Cells.

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We studied the effect of lipoxygenase inhibitors nordihydroguaiaretic acid (NDGA) and fungus Lecanicillum lecanii extract on lymphatic leukemia P388 cells. The cells grown in the abdominal cavity of DBA2 mice for 7 days were transferred into a nutrient medium. The effect of lipoxygenase inhibitors

Pneumococcus activation of the 5-lipoxygenase pathway and production of glycoproteins in the middle ear of rats.

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Pneumococcal otitis media is associated with the production of potent inflammatory mediators (leukotrienes), but the mechanism by which pneumococcus induces production of leukotrienes in the middle ear is poorly understood. In this study, up-regulation of 2 genes that govern the lipoxygenase

Hydroperoxidase activity of lipoxygenase in the presence of cyclodextrins.

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The oxidation of xenobiotics by the hydroperoxidase activity of lipoxygenase in the presence of cyclodextrins was studied. These produced an inhibitory effect on xenobiotics oxidation, based on their degree of hydrophobicity and the charge (isoproterenol < 4-methyl-catechol (4MC) <

Molecular dioxygen enters the active site of 12/15-lipoxygenase via dynamic oxygen access channels.

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Cells contain numerous enzymes that use molecular oxygen for their reactions. Often, their active sites are buried deeply inside the protein, which raises the question whether there are specific access channels guiding oxygen to the site of catalysis. Choosing 12/15-lipoxygenase as a typical example

Regiochemical and stereochemical evidence for enzyme-initiated catalysis in dual positional specific maize lipoxygenase-1.

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Dual positional specific maize lipoxygenase-1 catalyzed the formation of racemic mixtures of four possible regioisomers and was strongly inhibited by the radical scavenger, 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinoxy radical. Molecular modeling studies indicated that the oxygen-binding cavity is

Role of leukotrienes in rat reversed passive Arthus pleurisy and the effect of AA-861, a 5-lipoxygenase inhibitor.

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In studies of the role of leukotrienes in inflammatory reactions, the induction of rat reversed passive Arthus pleurisy (a type III allergic reaction) was employed. Increases of exudate volume, vascular permeability, and migration of inflammatory cells in the pleural cavity were observed. The

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