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Xiao-Fei Shang et al.
Scientific reports, 8(1), 1609-1609 (2018-01-27)
As important secondary plant metabolites, naphthoquinones exhibit a wide range of biological activities. However, their potential as sustainable alternatives to synthetic acaricides has not been studied. This study for the first time investigates the acaricidal activity of naphthoquinones against Psoroptes
Sergey V Dragana et al.
Natural product communications, 9(12), 1765-1768 (2015-01-30)
The concise synthesis of the lichen-derived antitumor agent hybocarpone (1) and its analogs is described. A new synthetic approach is based on the direct oxidative dimerization of the available naphthazarin precursors in the formation of the binaphtho[2,3-b; 2,3-d]furantetraone structure. It
Mirosław Jabłoński
Molecules (Basel, Switzerland), 25(23) (2020-12-02)
This article is probably the first such comprehensive review of theoretical methods for estimating the energy of intramolecular hydrogen bonds or other interactions that are frequently the subject of scientific research. Rather than on a plethora of numerical data, the
Piper R Hunt et al.
PloS one, 6(7), e21922-e21922 (2011-07-19)
Hormesis occurs when a low level stress elicits adaptive beneficial responses that protect against subsequent exposure to severe stress. Recent findings suggest that mild oxidative and thermal stress can extend lifespan by hormetic mechanisms. Here we show that the botanical
Joachim Sturve et al.
Comparative hepatology, 4(1), 4-4 (2005-05-06)
BACKGROUND: DT diaphorase (DTD; NAD(P)H:quinone oxidoreductase; EC 1.6.99.2) catalyses the two electron reduction of quinones, thus preventing redox cycling and consequently quinone dependent production of reactive oxygen species. In rat and mouse, a wide range of chemicals including polyaromatic hydrocarbons
Christina L L Chai et al.
The Journal of organic chemistry, 71(3), 992-1001 (2006-01-28)
A concise formal total synthesis of the cytotoxic bisnaphthazarin derivative hybocarpone has been completed through the development of routes to the synthetic precursor, 3-ethyl-2-hydroxy-5,7,8-trimethoxy-6-methyl-1,4-naphthoquinone. The oxidation of 3-ethyl-1,2,4,5,7,8-hexamethoxy-6-methylnaphthalene under Rapoport conditions gave 3-ethyl-2-hydroxy-5,7,8-trimethoxy-6-methyl-1,4-naphthoquinone in modest yields after basic hydrolysis. In
Vishnu K Tandon et al.
Bioorganic & medicinal chemistry letters, 15(13), 3288-3291 (2005-05-26)
A series of (1,4)-naphthoquinono [3,2-c]-1H-pyrazoles and their (1,4)-naphthohydroquinone derivatives 2-7 were synthesized and evaluated for antifungal, antibacterial, and anticancer activities. The structure-activity relationship of these compounds was studied and the results show that the compound 2b exhibited in vitro antifungal
Mansoureh Zahedi Tabrizi et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 60(1-2), 111-120 (2003-12-13)
FT Raman and FTIR spectra of Naphthazarin (5,8-dihydroxy-1,4-naphthoquinone) and its deuterated analogue are recorded. Comparison between the spectra obtained by two techniques, a series of density functional theory (DFT) calculations and the spectral behavior upon deuteration were used for the
Seon Young Choi et al.
Journal of neuroscience research, 90(9), 1842-1849 (2012-04-20)
"Neurohormesis" refers to a response to a moderate level of stress that enhances the ability of the nervous systems to resist more severe stress that might be lethal or cause dysfunction or disease. Neurohormetic phytochemicals, such as, resveratrol, sulforaphane, curcumin
Min Young Kim et al.
International journal of oncology, 46(4), 1659-1666 (2015-01-31)
Naphthazarin (Naph, DHNQ, 5,8-dihydroxy-l,4-naphthoquinone) is one of the naturally available 1,4-naphthoquinone derivatives that are well-known for their anti-inflammatory, antioxidant, antibacterial and antitumor cytotoxic effects in cancer cells. Herein, we investigated whether Naph has effects on cell cycle arrest and apoptosis
Luis F C Medina et al.
Canadian journal of microbiology, 50(11), 951-956 (2005-01-13)
The antimicrobial effect of 5 naphthoquinones was tested against the phytopathogenic bacteria Erwinia carotovora. Disk diffusion tests and determination of minimal inhibitory concentrations (MIC) indicate that the compound naphthazarin (NTZ) has the best antibacterial activity among the naphthoquinones tested. Studies
Omar Aljanadi et al.
Basic & clinical pharmacology & toxicology, 117(6), 369-374 (2015-05-28)
The 1,4-naphthoquinone derivative naphthazarin may trigger apoptosis and is thus considered for the treatment of malignancy. On the other hand, naphthazarin decreases neurotoxicity. In analogy to apoptosis of nucleated cells, erythrocytes may enter eryptosis, the suicidal erythrocyte death characterized by
C J Yong-Kee et al.
Neurotoxicity research, 22(4), 355-364 (2012-04-25)
Delineation of how cell death mechanisms associated with Parkinson's disease (PD) interact and whether they converge would help identify targets for neuroprotective therapies. The purpose of this study was to use a cellular model to address these issues. Catecholaminergic SH-SY5Y
An efficient formal synthesis of the human telomerase inhibitor (+/-)-gamma-rubromycin.
Dominea C K Rathwell et al.
Angewandte Chemie (International ed. in English), 48(43), 7996-8000 (2009-08-01)
Marilynn Chow et al.
Oncogene, 37(38), 5221-5232 (2018-06-01)
Expression of the transmembrane pseudokinase ROR1 is required for survival of t(1;19)-pre-B-cell acute lymphoblastic leukemia (t(1;19) pre-B-ALL), chronic lymphocytic leukemia, and many solid tumors. However, targeting ROR1 with small-molecules has been challenging due to the absence of ROR1 kinase activity.
Brígida R Pinho et al.
PloS one, 6(8), e24098-e24098 (2011-09-03)
The search of new anti-inflammatory drugs has been a current preoccupation, due to the need of effective drugs, with less adverse reactions than those used nowadays. Several naphthoquinones (plumbagin, naphthazarin, juglone, menadione, diosquinone and 1,4-naphthoquinone), plus p-hydroquinone and p-benzoquinone were
Jaw-Jou Kang et al.
Toxicology in vitro : an international journal published in association with BIBRA, 20(1), 43-51 (2005-07-16)
The effects of the naphthoquinone analogue, naphthazarin (Nap), and its derivative, methylnaphthazarin (MetNap), on vascular reactivity were studied using isolated rat aortic rings and human umbilical vein endothelial cells (HUVECs). In this study, we determined vessel tension, nitric oxide (NO)
E M Park et al.
Cell biology and toxicology, 19(5), 273-284 (2004-01-02)
The presence of hypoxic cells in solid tumors has long been considered a problem in cancer treatment. Resistance of hypoxic cells to ionizing radiation and anticancer drugs has in part been attributed to changes in altered gene expression by hypoxia.
C J Yong-Kee et al.
Neurotoxicity research, 21(2), 185-194 (2011-07-21)
Dysfunction of mitochondria, the ubiquitin proteasome system (UPS), and lysosomes are believed to contribute to the pathogenesis of Parkinson's disease (PD). If it were possible to rescue functionally compromised, but still viable neurons early in the disease process, this would
Bok Hee Kim et al.
Archives of pharmacal research, 29(2), 123-130 (2006-03-11)
1,4-Naphthoquinones are widely distributed in nature and many clinically important antitumor drugs containing a quinone moiety, such as anthracyclines, mitoxantrones and saintopin, show excellent anticancer activity. In this study, 2- or 6-substituted 5,8-dimethoxy-1,4-naphthoquinone (DMNQ) and 5,8-dihydroxy-1,4-naphthoquinone (DHNQ) derivatives were synthesized
Tae Gen Son et al.
Biochemical and biophysical research communications, 433(4), 602-606 (2013-03-30)
Nuclear factor E2-related factor 2 (Nrf2)/antioxidant response element (ARE) pathway is an important cellular stress response pathway involved in neuroprotection. We previously screened several natural phytochemicals and identified plumbagin as a novel activator of the Nrf2/ARE pathway that can protect
Antonio E Alegría et al.
Free radical biology & medicine, 37(10), 1631-1639 (2004-10-13)
Ortho-quinones 1,10-phenanthroquinone and beta-lapachone but not para-quinones naphthazarin (NZQ) and 1,4-naphthoquinone enhance ascorbate oxidation in the presence of MgCl(2) and CaCl(2) at constant ionic strength. Alkaline-earth cation chelation is observed for the ortho-semiquinones but not for the para-semiquinones, while no
Dong-Hee Choi et al.
Free radical biology & medicine, 33(10), 1321-1333 (2002-11-07)
Oxidative stress and mitochondrial dysfunction are important aspects of pathogenesis, particularly in the brain, which is highly dependent on oxygen, and the protection of astrocytes is essential for neuroprotection. In this context, imidazoline drugs have been reported to be neuroprotective.
Tatjana Kundaković et al.
Phytotherapy research : PTR, 20(7), 602-604 (2006-05-24)
The cytotoxicity of naphthazarin derivatives isolated from the roots of Onosma arenaria on human cervix adenocarcinoma cells (HeLa) and leukaemia K562 cells, as well on non-malignant peripheral blood mononuclear cells (PBMC) was studied. The results show that beta-hydroxyisovalerylalkannin, acetylalkannin and
L M B C Ribeiro et al.
Microbial pathogenesis, 144, 104127-104127 (2020-03-15)
Despite the main strategy to overcome bacterial resistance has focused on the development of more potent antimicrobial agents, the evolutionary pressure caused by such drugs makes this strategy limited. Molecules that interfere with virulence factors appear as a promising alternative
Zhi-Shu Huang et al.
European journal of medicinal chemistry, 39(9), 755-764 (2004-09-01)
Alkannin derivatives (3-19) were prepared through the reaction of beta,beta-dimethylacrylalkannin (1), the most abundant isohexenylnaphthazarin isolated from the roots of Arnebia euchroma, with different types of nucleophiles such as amines and thiols in the absence or presence of a reducing
Héctor J Lozano et al.
Dalton transactions (Cambridge, England : 2003), 46(11), 3611-3622 (2017-03-01)
In this work, we report experimental and computational evidence for the intercalation into the DNA base-pairs of the free quinones quinizarin (Q) and naphthazarin (N) and the interstrand covalent binding of their p-cymene di-ruthenium(ii) complexes (Cl
Jacqueline A Gleave et al.
Neurobiology of disease, 106, 133-146 (2017-07-05)
Parkinson's disease (PD) is a neurodegenerative movement disorder, which affects approximately 1-2% of the population over 60years of age. Current treatments for PD are symptomatic, and the pathology of the disease continues to progresses over time until palliative care is
Nikolaos K Andrikopoulos et al.
Phytotherapy research : PTR, 17(5), 501-507 (2003-05-16)
Naturally occurring gums and resins with beneficial pharmaceutical and nutraceutical properties were tested for their possible protective effect against copper-induced LDL oxidation in vitro. Chiosmastic gum (CMG) (Pistacia lentiscus var. Chia resin) was the most effective in protecting human LDL
Ann-Charlotte Johansson et al.
Acta oto-laryngologica, 126(1), 70-81 (2005-11-26)
Intracellular cysteine cathepsins are pro-apoptotic factors involved in activation of caspases in two oral squamous cell carcinoma (SCC) cell lines. To study the possible involvement of lysosomal cathepsins in oral SCC cell apoptosis. Apoptosis was induced in the two human
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