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Adam Gesing et al.
Cell biochemistry and function, 26(3), 314-319 (2007-09-18)
Aflatoxin B1 (AFB1) is a potent hepatotoxic and hepatocarcinogenic mycotoxin. Reactive oxygen species are considered to participate in the main mechanism of aflatoxin toxicity. Melatonin (Mel) is a hormone which has antioxidative activities. N-acetylserotonin (NAc-5HT) is an immediate precursor of
Ye Li et al.
Journal of biological rhythms, 30(6), 519-532 (2015-10-09)
The chicken pineal gland synthesizes and releases melatonin rhythmically in light/dark (LD) cycles, with high melatonin levels during the dark phase, and in constant darkness (DD) for several cycles before it gradually damps to arrhythmicity in DD. Daily administration of
Yoshimitsu Yamazaki et al.
Bioorganic & medicinal chemistry letters, 19(15), 4178-4182 (2009-06-16)
A series of N-acyl derivatives of tyramine, tryptamine, and serotonin were synthesized and tested on anti-melanogenic activity. The serotonin derivatives such as N-caffeoylserotonin (3) and N-protocatechuoylserotonin (9) were inhibitory to tyrosinase from mouse B16 and human HMV-II melanoma cells, while
E M Khalil et al.
The Journal of biological chemistry, 273(46), 30321-30327 (1998-11-07)
Serotonin N-acetyltransferase (arylalkylamine N-ace-tyltransferase (AANAT)) catalyzes the reaction of serotonin (or tryptamine) with acetyl-CoA to form N-acetylserotonin (or N-acetyltryptamine) and is responsible for the melatonin circadian rhythm in vertebrates. This study evaluates a series of indoleamine analogs as alternate substrates
Andreas Behrends et al.
Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes, 42(6), 599-606 (2007-08-19)
The redox-active quinalphos main metabolite, 2-hydroxyquinoxaline, is particularly effective under excitation by light. We have studied the photocatalytic destruction of melatonin and its precursors, because the cytoprotective indoleamine has been detected in high quantities in mammalian skin. In photooxidation reactions
Daniel Todd et al.
PloS one, 9(2), e87923-e87923 (2014-02-08)
Huntington's disease (HD) is a devastating, genetic neurodegenerative disease caused by a tri-nucleotide expansion in exon 1 of the huntingtin gene. HD is clinically characterized by chorea, emotional and psychiatric disturbances and cognitive deficits with later symptoms including rigidity and
Gianluca Tosini et al.
The Neuroscientist : a review journal bringing neurobiology, neurology and psychiatry, 18(6), 645-653 (2012-05-16)
N-Acetylserotonin (NAS) is a naturally occurring chemical intermediate in biosynthesis of melatonin. Previous studies have shown that NAS has different brain distribution patterns from those of serotonin and melatonin, suggesting that NAS might have functions other than as a precursor
Sung-Wuk Jang et al.
Proceedings of the National Academy of Sciences of the United States of America, 107(8), 3876-3881 (2010-02-06)
Brain-derived neurotrophic factor (BDNF) is a cognate ligand for the TrkB receptor. BDNF and serotonin often function in a cooperative manner to regulate neuronal plasticity, neurogenesis, and neuronal survival. Here we show that NAS (N-acetylserotonin) swiftly activates TrkB in a
Shuangxi Wang et al.
Hypertension (Dallas, Tex. : 1979), 52(3), 484-490 (2008-07-23)
GTP cyclohydrolase 1 (GTPCH1) is the rate-limiting enzyme in de novo synthesis of tetrahydrobiopterin (BH4), an essential cofactor for endothelial NO synthase (eNOS) dictating, at least partly, the balance of NO and superoxide produced by this enzyme. The aim of
Hitoshi Aonuma et al.
PloS one, 7(8), e43377-e43377 (2012-08-21)
We examined changes in the content of biogenic amines in the brains of ant queen associated with early colony establishment. In ants, including Formica japonica, winged virgin queens lose their wings following copulation, and then start establishing a colony. Significant
J Vanecek et al.
Endocrinology, 126(3), 1509-1513 (1990-03-01)
Melatonin's transduction mechanisms were investigated using in vitro cultured anterior hemipituitaries. Melatonin inhibited cAMP and 3',5'-cyclic GMP accumulation in neonatal rat anterior pituitary stimulated with LHRH. Maximal inhibitory effect was reached within 25 min and persisted for at least 20
Elena B C Llambías et al.
International journal of toxicology, 26(6), 545-551 (2007-12-11)
Hexachlorobenzene produces an experimental hepatic porphyria in rats, which is similar to human porphyria cutanea tarda, with hyperpigmentation as one of its characteristic features. Alterations in tryptophan metabolism have been previously observed in this chronic porphyria. Melatonin formation from tryptophan
I J Beresford et al.
Biochemical pharmacology, 56(9), 1167-1174 (1998-11-05)
The activation of G-proteins by melatonin mt1 receptors was studied by measuring [35S]-guanosine-5'-(3-thiotriphosphate) ([35S]-GTPgammaS) binding to membranes prepared from Chinese hamster ovary (CHO) cells stably expressing human mt1 receptors. Melatonin stimulated [35S]-GTPgammaS binding in a concentration-dependent manner (pEC50, 8.77+/-0.02). The
D Sugden et al.
Biology of the cell, 89(8), 531-537 (1998-06-10)
The recent cloning of three distinct melatonin receptor subtypes (Mel1a, Mel1b and Mel1c) which are part of a new family of G-protein coupled receptors, and probably mediate the physiological actions of the hormone, has spurred interest in the design of
Natalia Fagali et al.
Biochemical and biophysical research communications, 423(4), 873-877 (2012-06-21)
There is no general agreement yet on the antioxidant effect of pineal indoles against lipid peroxidation. Accordingly, the main goal of the present work was to study the antioxidant activity of melatonin (MLT), N-acetylserotonin (NAS), 5-HO-tryptophan (5HO-TRP) and 5-methoxytryptamine (5MTP)
G F Oxenkrug et al.
Annals of the New York Academy of Sciences, 1122, 245-252 (2007-12-14)
The ability of methylene blue (MB) to inhibit the nitric oxide-induced stimulation of N-methyl-D-aspartate receptors has been suggested as a possible mechanism of MB's clinical antidepressant action. This study evaluated the alternative/additional mechanisms of the antidepressant effect of MB on
Michał A Zmijewski et al.
Molecular and cellular endocrinology, 307(1-2), 211-216 (2009-05-05)
Since melatonin production has been documented in extrapineal and extraneuronal tissues, we investigated the expression of molecular elements of the melatoninergic system in human RPE cells (ARPE-19). The expression of key enzymes for melatonin synthesis: tryptophan hydroxylases (TPH1 and TPH2);
Sheela Nagarkoti et al.
Free radical research, 53(3), 281-292 (2019-01-10)
Recent report from this lab has shown role of Rac2 in the translocation of inducible nitric oxide synthase (iNOS) to the phagosomal compartment of polymorphonuclear leukocytes (PMNs) following phagocytosis of beads. This study was undertaken to further assess the status
Tae-Kang Kim et al.
FASEB journal : official publication of the Federation of American Societies for Experimental Biology, 27(7), 2742-2755 (2013-04-27)
Indolic and kynuric pathways of skin melatonin metabolism were monitored by liquid chromatography mass spectrometry in human keratinocytes, melanocytes, dermal fibroblasts, and melanoma cells. Production of 6-hydroxymelatonin [6(OH)M], N(1)-acetyl-N(2)-formyl-5-methoxykynuramine (AFMK) and 5-methoxytryptamine (5-MT) was detected in a cell type-dependent fashion.
Phedias Diamandis et al.
Nature chemical biology, 3(5), 268-273 (2007-04-10)
The identification of self-renewing and multipotent neural stem cells (NSCs) in the mammalian brain holds promise for the treatment of neurological diseases and has yielded new insight into brain cancer. However, the complete repertoire of signaling pathways that governs the
Michal Stuss et al.
Neuro endocrinology letters, 31(4), 489-496 (2010-08-31)
Bacterial lipopolysaccharide (LPS) causes lipid peroxidation (LPO). We have found that LPS induces LPO in vitro, in tissue homogenates in a concentration-dependent manner, the concentration of 400 µg/ml demonstrating the most efficient lipid damaging effect . Both melatonin and its precursor
Aneta Piesiewicz et al.
General and comparative endocrinology, 179(2), 143-151 (2012-09-01)
Previously, we demonstrated that experimental peritonitis in chickens was attenuated by treatment with exogenous melatonin, while the developing inflammation decreased pineal AANAT activity. This suggested the existence of a bidirectional relationship between the activated immune system and pineal gland function.
Mariana Gavazza et al.
Molecular and cellular biochemistry, 321(1-2), 37-43 (2008-09-02)
In this study, we examined the relative efficacies of alpha-tocopherol, N-acetyl-serotonin, and melatonin in reducing ascorbate-Fe(2+) lipid peroxidation (LPO) of rat testicular microsomes and mitochondria. Special attention was paid to the changes produced on the highly polyunsaturated fatty acids (PUFAs)
Qingzhi Li et al.
Journal of molecular neuroscience : MN, 67(4), 574-588 (2019-01-27)
In this study, with primary mouse neural progenitor cells (NPCs), we investigated the neuroprotective effect of a tropomyosin-related kinase receptor B (TrkB) agonist, N-acetyl serotonin (NAS), against hydrogen peroxide (H2O2)-induced toxicity. We found that pre-incubation with NAS not only ameliorates
N-Acetylserotonin and 6-hydroxymelatonin against oxidative stress: Implications for the overall protection exerted by melatonin
A?lvarez DR, et al.
The Journal of Physical Chemistry B, 119(27), 8535-8543 (2015)
Masahiro Matsuo et al.
FEBS letters, 587(9), 1392-1398 (2013-03-26)
The 24-h rhythmic production of melatonin by the pineal gland is essential for coordinating circadian physiology. Melatonin production increases at night in response to the release of norepinephrine from sympathetic nerve processes which innervate the pineal gland. This signal is
Tongyu Rui et al.
Neurochemistry international, 132, 104606-104606 (2019-11-25)
Tropomyosin-related kinase B (TrkB) has emerged as a key mediator in the pathophysiology of traumatic brain injury (TBI). However, it is not known whether TrkB's agonist N-acetyl serotonin (NAS) involves in neuronal damage and brain dysfunction caused by TBI that
Igor Semak et al.
Journal of pineal research, 45(4), 515-523 (2008-08-23)
In the present study we provide direct evidence for the involvement of rat microsomal cytochrome P450s in melatonin O-demethylation and hydroxylation at two different positions: 2 and 6, as well as generation of N(1)-acetyl-N(2)-formyl-5-methoxy-kynuramine (AFMK) and two unknown products. Moreover
B B P Gupta et al.
Indian journal of experimental biology, 48(8), 786-792 (2011-02-24)
Arylalkylamine N-acetyltransferase (AA-NAT) is the rate-limiting enzyme of melatonin biosynthetic pathway. In vitro effects of 5-hydroxytryptophan (5-HTP) and indoleamines (serotonin, N-acetylserotonin and melatonin) were studied on AA-NAT activity in the pineal organ of the fish, C. gariepinus during different phases
Melissa D Carter et al.
Journal of mass spectrometry : JMS, 47(3), 277-285 (2012-03-21)
Melatonin (MEL) and its chemical precursor N-acetylserotonin (NAS) are believed to be potential biomarkers for sleep-related disorders. Measurement of these compounds, however, has proven to be difficult due to their low circulating levels, especially that of NAS. Few methods offer
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