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Pàgina 1 des de 21 resultats
Structure and tumor-promoting activity of analogues of anthralin (1,8-dihydroxy-9-anthrone).
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Seventeen analogues of the tumor-promoting agent anthralin were tested for the same biological property by repeated skin application on mouse skin using female ICR/Ha Swiss mice, after a single application of a subcarcinogenic dose of 7,12-dimethylbenz[a]anthracene. Seven of the compounds tested are
Knipholone anthrone from Kniphofia foliosa induces a rapid onset of necrotic cell death in cancer cells.
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The present study examines the comparative cytotoxicity of knipholone (KP) and knipholone anthrone (KA) in leukaemic and melonocyte cancer cell lines. It was found that KA induces a rapid onset of cytotoxicity with IC(50) values ranging from 0.5 to 3.3 μM. In comparison to KA, KP was 70-480-times
Detection and characterization of 9-anthron-10-yl radicals formed by antipsoriatic and tumor-promoting 9-anthrones in aqueous buffers.
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Certain 1,8-dihydroxy-9-anthrones have been used for the topical treatment of psoriasis for over seventy-five years. The therapeutic usefulness of these compounds is limited, however, by side effects including severe skin inflammation and staining. Antipsoriatic 9-anthrones are also tumor promoters
An EPR study of free radicals formed by antipsoriatic and tumor-promoting 9-anthrones in nonpolar solvents.
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Certain 9-anthrone derivatives are useful in treating psoriasis and are also known to be tumor promoters in mouse skin. Their therapeutic use is accompanied by side effects of severe skin inflammation, irritation, and staining. The precise biochemical mechanisms of therapeutic action, tumor
Anthrone and oxanthrone C-glycosides from Picramnia latifolia collected in Peru.
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Cytotoxicity-based, bioassay-guided fractionation of the chloroform-soluble extracts of both the roots and leaves of Picramnia latifolia led to the isolation of two new anthrone C-glycosides, picramniosides G (1) and H (2), two new oxanthrone C-glycosides, mayosides D (3) and E (4), and a new
Genetic factors controlling responsiveness to skin tumor promotion in mice.
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Two genetic models that could explain all of the current data are depicted in Figure 4, although it should be stressed that proof of any model will require additional genetic analyses. The first model (Model A) indicates that one or more loci controlling responsiveness to TPA are also responsible
Evidence for a common genetic pathway controlling susceptibility to mouse skin tumor promotion by diverse classes of promoting agents.
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The present study has compared different mouse stocks and strains with known sensitivity to phorbol ester skin tumor promotion for their sensitivities to skin tumor promotion by a prototypic organic peroxide (benzoyl peroxide, BzPo) and anthrone (chrysarobin, Chr) tumor promoter. Following
Differential mechanism for the inhibition of epidermal growth factor binding to its receptor on mouse keratinocytes by anthrones and phorbol esters.
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1,8-Dihydroxy-3-methyl-9-anthrone (chrysarobin), a potent anthrone tumor promoter, reduced [125I] epidermal growth factor (EGF) binding to its receptor in primary epidermal cells from SENCAR mice maintained in low Ca2+ containing medium. The time course for this effect with chrysarobin was different
Characterization of the hydroperoxide response observed in mouse skin treated with tumor promoters in vivo.
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The production of hydroperoxides is rapidly increased and remains at 200-280% of the control 1-24 h after the second daily application of 17 nmol of 12-O-tetradecanoylphorbol-13-acetate (TPA) to mouse skin in vivo. The levels of hydroperoxides are increased 1.63-, 2.64-, 4.07-, and 4.31-fold 18 h
Evidence for autocrine/paracrine growth stimulation by transforming growth factor-alpha during the process of skin tumor promotion.
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A single topical application of 12-O-tetradecanoylphorbol-13-acetate (TPA) to mouse skin decreased 125I-labeled epidermal growth factor (EGF) binding in epidermal membrane preparations within 1 h while 1,8-dihydroxy-3-methyl-9-anthrone (chrysarobin) gradually reduced binding with maximum inhibition
Effect of the Chinese Medicine YangZheng XiaoJi on Reducing Fatigue in Mice with Orthotopic Transplantation of Colon Cancer.
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Synthesis and antitumor activity of 10-substituted benzylidene anthrone.
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Fifteen compounds of 10-substituted benzylidene anthrone were prepared with moderate yield by reaction of anthrone and substituted benzaldehydes under the presence of pyridine and piperidine as catalyst. Their antitumor activities in vitro were evaluated. The results show that the
Antitumor and antimetastatic actions of anthrone-C-glucoside, cassialoin isolated from Cassia garrettiana heartwood in colon 26-bearing mice.
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We examined the antitumor and antimetastatic actions of 10-hydroxy-anthrone-C-glucoside cassialoin isolated from Cassia garrettiana heartwood in colon 26-bearing mice. Cassialoin (5 and 10 mg/kg) inhibited tumor growth and metastasis to the abdomen and the expression of CD31 (angiogenesis marker) in
Structure-activity relationships for the formation of secondary radicals and inhibition of keratinocyte proliferation by 9-anthrones.
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The biological properties of tumor-promoting and antipsoriatic 9-anthrones have been hypothesized to be mediated by free radical products such as the corresponding 9-anthron-10-yl radicals or by O2-, OH, and other persistent secondary radicals that are formed in the skin after topical treatment with
Antioxidants attenuate anthralin-induced skin inflammation in BALB/c mice: role of specific proinflammatory cytokines.
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Anthralin is the most common therapeutic agent among a small number of pro-oxidant, 9-anthrones effective in the topical treatment of psoriasis. However, the usefulness of this drug is diminished by toxic side effects, including skin irritation and inflammation. The activities of anthralin are
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