scholarly journals Isoxazole derivatives as new nitric oxide elicitors in plants

2017 ◽  
Vol 13 ◽  
pp. 659-664 ◽  
Author(s):  
Anca Oancea ◽  
Emilian Georgescu ◽  
Florentina Georgescu ◽  
Alina Nicolescu ◽  
Elena Iulia Oprita ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Reactive Oxygen Species ◽  
Reactive Oxygen Species Generation ◽  
Dipolar Cycloaddition ◽  
Oxygen Species ◽  
Cycloaddition Reactions ◽  
Nitrile Oxides ◽  
Activated Alkynes ◽  
Isoxazole Derivatives

Several 3,5-disubstituted isoxazoles were obtained in good yields by regiospecific 1,3-dipolar cycloaddition reactions between aromatic nitrile oxides, generated in situ from the corresponding hydroxyimidoyl chlorides, with non-symmetrical activated alkynes in the presence of catalytic amounts of copper(I) iodide. Effects of 3,5-disubstituted isoxazoles on nitric oxide and reactive oxygen species generation in Arabidopsis tissues was studied using specific diaminofluoresceine dyes as fluorescence indicators.

scholarly journals Modulation of metabolic activity of phagocytes by antihistamines

2011 ◽  
Vol 4 (1) ◽  
pp. 15-19 ◽  
Author(s):  
Antonin Lojek ◽  
Milan Číž ◽  
Michaela Pekarová ◽  
Gabriela Ambrožová ◽  
Ondřej Vašíček ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Reactive Oxygen Species ◽  
Metabolic Activity ◽  
Reactive Oxygen Species Generation ◽  
Reactive Oxygen ◽  
Inhibitory Effect ◽  
Oxygen Species ◽  
Antioxidative Properties ◽  
Enhanced Chemiluminescence ◽  
Inos Protein Expression

Modulation of metabolic activity of phagocytes by antihistaminesThe purpose of the study was to investigate the effects of H1-antihistamines of the 1stgeneration (antazoline, bromadryl, brompheniramine, dithiaden, cyclizine, chlorcyclizine, chlorpheniramine, clemastine) and the 2ndgeneration (acrivastine, ketotifen, and loratadine) on the respiratory burst of phagocytes. Reactive oxygen species generation in neutrophils isolated from rat blood was measured using luminol-enhanced chemiluminescence. Changes in nitrite formation and iNOS protein expression by RAW 264.7 macrophages were analysed using Griess reaction and Western blotting. The antioxidative properties of drugs in cell-free systems were detected spectrophotometrically, luminometrically, fluorimetrically, and amperometrically. The majority of the H1-antihistamines tested (bromadryl, brompheniramine, chlorcyclizine, chlorpheniramine, clemastine, dithiaden, and ketotifen) exhibited a significant inhibitory effect on the chemiluminescence activity of phagocytes. H1-antihistamines did not show significant scavenging properties against superoxide anion and hydroxyl radical, thus this could not contribute to the inhibition of chemiluminescence. H1-antihistamines had a different ability to modulate nitric oxide production by LPS-stimulated macrophages. Bromadryl, clemastine, and dithiaden were the most effective since they inhibited iNOS expression, which was followed by a significant reduction in nitrite levels. H1-antihistamines had no scavenging activity against nitric oxide. It can be concluded that the effects observed in the H1-antihistamines tested are not mediated exclusively via H1-receptor pathway or by direct antioxidative properties. Based on our results, antihistamines not interfering with the microbicidal mechanisms of leukocytes (antazoline, acrivastine and cyclizine) could be used preferentially in infections. Other antihistamines should be used, under pathological conditions accompanied by the overproduction of reactive oxygen species.

Regulatory mechanisms of nitric oxide and reactive oxygen species generation and their role in plant immunity

Nitric Oxide ◽  
2011 ◽  
Vol 25 (2) ◽  
pp. 216-221 ◽  
Author(s):  
Hirofumi Yoshioka ◽  
Keisuke Mase ◽  
Miki Yoshioka ◽  
Michie Kobayashi ◽  
Shuta Asai
Keyword(s):  
Nitric Oxide ◽  
Reactive Oxygen Species ◽  
Plant Immunity ◽  
Reactive Oxygen Species Generation ◽  
Reactive Oxygen ◽  
Regulatory Mechanisms ◽  
Oxygen Species

scholarly journals Modulation of rat peripheral polymorphonuclear leukocyte response by nitric oxide and arginine

Blood ◽  
1994 ◽  
Vol 84 (8) ◽  
pp. 2741-2748 ◽  
Author(s):  
P Seth ◽  
R Kumari ◽  
M Dikshit ◽  
RC Srimal
Keyword(s):  
Nitric Oxide ◽  
Reactive Oxygen Species ◽  
Methylene Blue ◽  
Polymorphonuclear Leukocytes ◽  
Reactive Oxygen Species Generation ◽  
Oxygen Species ◽  
Superoxide Generation ◽  
No Donor ◽  
Radical Generation ◽  
Leukocyte Response

The effect of nitric oxide (NO) on the luminol-dependent chemiluminescence (LCL) response of rat polymorphonuclear leukocytes (PMNLs) was analyzed by using sodium nitroprusside (SNP), a NO donor, and L-arginine (L-arg), a NO precursor. A significant reduction in the LCL intensity was observed in presence of SNP (100 mumol/L) or L-arg (5 or 10 mmol/L) in arachidonic acid (AA) phorbol ester (PMA) and formyl- methionyl-leucyl-phenylalanine stimulated PMNLs. However, opsonized zymosan-induced LCL was not attenuated significantly. Reduction in hydroxyl radical and superoxide generation was also observed in SNP- or L-arg-pretreated cells. D-Arg (10 mmol/L) pretreatment did not inhibit PMNLs' LCL response. Furthermore, methylene blue (5 mumol/L) and L-NG- mono methyl-L-arginine (100 or 300 mumol/L) significantly attenuated the LCL response, as induced by various agonists. Cyclic GMP did not alter the reactive oxygen species generation from rat PMNLs. In addition, AA-induced release of myeloperoxidase, a marker of azurophilic granules, was found to be enhanced in L-arg- (10 mmol/L) pretreated PMNLs. The results suggest that NO inhibits free radical generation from rat PMNLs.

scholarly journals The H2S Donor GYY4137 Stimulates Reactive Oxygen Species Generation in BV2 Cells While Suppressing the Secretion of TNF and Nitric Oxide

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2966 ◽  
Author(s):  
Milica Lazarević ◽  
Emanuela Mazzon ◽  
Miljana Momčilović ◽  
Maria Basile ◽  
Giuseppe Colletti ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Reactive Oxygen Species ◽  
Reactive Oxygen Species Generation ◽  
Reactive Oxygen ◽  
Microglial Cells ◽  
Oxygen Species ◽  
Bv2 Cells ◽  
The Central Nervous System

GYY4137 is a hydrogen sulfide (H2S) donor that has been shown to act in an anti-inflammatory manner in vitro and in vivo. Microglial cells are among the major players in immunoinflammatory, degenerative, and neoplastic disorders of the central nervous system, including multiple sclerosis, Parkinson’s disease, Alzheimer’s disease, and glioblastoma multiforme. So far, the effects of GYY4137 on microglial cells have not been thoroughly investigated. In this study, BV2 microglial cells were stimulated with interferon-gamma and lipopolysaccharide and treated with GYY4137. The agent did not influence the viability of BV2 cells in concentrations up to 200 μM. It inhibited tumor necrosis factor but not interleukin-6 production. Expression of CD40 and CD86 were reduced under the influence of the donor. The phagocytic ability of BV2 cells and nitric oxide production were also affected by the agent. Surprisingly, GYY4137 upregulated generation of reactive oxygen species (ROS) by BV2 cells. The effect was mimicked by another H2S donor, Na2S, and it was not reproduced in macrophages. Our results demonstrate that GYY4137 downregulates inflammatory properties of BV2 cells but increases their ability to generate ROS. Further investigation of this unexpected phenomenon is warranted.

scholarly journals Modulation of Ca2+-activated K+ channel in renal artery endothelium in situ by nitric oxide and reactive oxygen species

2003 ◽  
Vol 64 (1) ◽  
pp. 199-207 ◽  
Author(s):  
Susanne Brakemeier ◽  
Ines Eichler ◽  
Andrea Knorr ◽  
Til Fassheber ◽  
Ralf Köhler ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Reactive Oxygen Species ◽  
Renal Artery ◽  
Reactive Oxygen ◽  
K Channel ◽  
Oxygen Species
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