piperidine/sarcoom

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Reversal of drug resistance in sarcoma-45 by the new calmodulin antagonist--trihydrochloride of [1,2,5-trimethyl-4-phenyl-4-beta-[N-(beta-ethylamino)-N-4'-methoxybe nzy l]-ethylamino] piperidine (AR-2).

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The anti-drug resistance effect of three derivatives (AR-1, AR-2 and AR-3) of [1,2,5-trimethyl-4-phenyl-4-beta-(N,N-disubstituted-ethylamino)] piperidines, that were evaluated as calcium and calmodulin antagonists, was studied on doxorubicin (ADM) and vincristine (VCR) resistant Sarcoma-45

Tempicol-3, a novel piperidine-N-oxide stable radical and antioxidant, with low toxicity acts as apoptosis inducer and cell proliferation modifier of Yoshida Sarcoma cells in vivo.

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The novel nitroxyl, Tempicol-3 (nitroxide-N-oxide) was synthesized and its capacity to act as a scavenger of hydroxyl radicals was tested. The concentration-dependent reducibility of this novel compound was also examined and compared with those of previously characterized nitroxides, Tempo and

Evidence for peroxidative oxidation of substituted piperidine nitroxides, acting as apoptosis inducers in Yoshida Sarcoma cells in vivo.

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The results presented herein clearly indicate that nitroxide derivatives--free radicals are effective as substrates for one-electron oxidation in the peroxidase cycle involving hydrogen peroxide, which have been the subject of considerable controversy. This oxidation is catalyzed enzymatically and

Carcinogenicity of the isomeric, N-nitroso-delta3-and N-nitroso-delta2-piperidines in rats and the in vivo isomerization of the delta3-to the delta2-isomer.

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N-Nitroso-1,2,3,6-tetrahydropyridine (N-nitroso-delta3-piperidine), N-nitroso-1,2,3,4-tetrahydropyridine (N-nitroso-delta2-piperidine) and N-nitroso-3,4-epoxypiperidine were tested for carcinogenicity in Fischer 344 rats. The unsaturated nitrosamines were administered in drinking water (100 mg/l).

TTT, a novel free radical spin trap, induces apoptosis in sarcoma Yoshida cells in vivo: comparative investigations of its cytotoxicity in vitro.

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In light of our previous SAR studies on nitroxides acting as less toxic anticancer agents, antioxidants and radioprotectors, we designed and tested, in vivo an in vitro, a new triradical spin trap -N,N',N"-tris-(l-oxyl-2,2,6,6-tetramethylpiperidine-4-yl)-1,3, 5-tnazine-2,4,6-triamine (TTT). The

In vivo growth-inhibition of Sarcoma 180 by piplartine and piperine, two alkaloid amides from Piper.

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Piplartine {5,6-dihydro-1-[1-oxo-3-(3,4,5-trimethoxyphenyl)-2-propenyl]-2(1H)pyridinone} and piperine {1-5-(1,3)-benzodioxol-5-yl)-1-oxo-2,4-pentadienyl]piperidine} are alkaloid amides isolated from Piper. Both have been reported to show cytotoxic activity towards several tumor cell lines. In the

Chemical and biological properties of a new series of cis-diammineplatinum(II) antitumor agents containing three nitrogen donors: cis-[Pt(NH3)2(N-donor)Cl]+.

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A series of 32 cationic platinum(II) complexes of the form cis-[PtA2(Am)Cl]+, where A is a monodentate (NH3 or i-PrNH2) or A2 is a bidentate (ethylenediamine or 1,2-diaminocyclohexane) amine and Am is either a heterocyclic amine based on a pyridine, pyrimidine, purine, piperidine, or a saturated

Impact of copper and iron binding properties on the anticancer activity of 8-hydroxyquinoline derived Mannich bases.

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The anticancer activity of 8-hydroxyquinolines relies on complex formation with redox active copper and iron ions. Here we employ UV-visible spectrophotometry and EPR spectroscopy to compare proton dissociation and complex formation processes of the reference compound 8-hydroxyquinoline (Q-1) and

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