Synthesis and Quantitative Structure–Activity Relationship of Imidazotetrazine Prodrugs with Activity Independent of O6-Methylguanine-DNA-methyltransferase, DNA Mismatch Repair, and p53
摘要:
The antitumor prodrug temozolomide is compromised by its dependence for activity on DNA mismatch repair (MMR) and the repair of the chemosensitive DNA lesion, O6-methylguanine (O6-MeG), by O6-methylguanine-DNA-methyltransferase (E.C. 2.1.1.63, MGMT). Tumor response is also dependent on wild-type p53. Novel 3-(2-anilinoethyl)-substituted imidazotetrazines are reported that have activity independent of MGMT, MMR, and p53. This is achieved through a switch of mechanism so that bioactivity derives from imidazotetrazine-generated arylaziridinium ions that principally modify guanine-N7 sites on DNA. Mono- and bifunctional analogues are reported, and a quantitative structure-activity relationship (QSAR) study identified the p-tolyl-substituted bifunctional congener as optimized for potency, MGMT-independence, and MMR-independence. NCI60 data show the tumor cell response is distinct from other imidazotetrazines and DNA-guanine-N7 active agents such as nitrogen mustards and cisplatin. The new imidazotetrazine compounds are promising agents for further development, and their improved in vitro activity validates the principles on which they were designed.
or diphenylamine fragments were synthesized, and their anticancer activities were tested by MTT assay against human melanoma A375 and colon adenocarcinoma HT-29 cell lines. In general, the synthesized compounds were more cytotoxic against HT-29 than A375. 3-((4-Methoxyphenyl)(3-oxo-3-(2-(2-oxoindolin-3-ylidene)hydrazinyl)propyl)amino)-N’-(2-oxoindolin-3-ylidene)propanehydrazide and (N’,N’’’)-1,1’-(methylenebis(4
合成了一系列新的单腙和双腙,每个都带有 2-羟吲哚部分以及取代的苯氨基丙酰胺、吡咯烷-2-one、苯并咪唑、二苯甲烷或二苯胺片段,并通过 MTT 法测试了它们对人黑色素瘤 A375 和结肠的抗癌活性腺癌 HT-29 细胞系。一般来说,合成的化合物对 HT-29 的细胞毒性比 A375 更强。3-((4-甲氧基苯基)(3-oxo-3-(2-(2-oxoindolin-3-ylidene)hydrazinyl)丙基)amino) -N '-(2-oxoindolin-3-ylidene)丙酰肼和( N ', N ''')-1,1'-(亚甲基双(4,1-亚苯基))双(5-氧代-N'-(2-oxoindolin-3-ylidene)pyrrolidine-3-carbohydrazide) 被鉴定为在 2D 和 3D 细胞培养物中对抗 HT-29 的最活性化合物。在通过铁还原抗氧化能力测定 (FRAP)
POLYACETAL RESIN COMPOSITION
申请人:Polyplastics Co., Ltd.
公开号:EP1686156A1
公开(公告)日:2006-08-02
A polyacetal resin composition comprises a polyacetal resin and a hetero atom-containing aliphatic carboxylic acid hydrazide. The proportion of the hetero atom-containing aliphatic carboxylic acid hydrazide may be about 0.001 to 20 parts by weight relative to 100 parts by weight of the polyacetal resin. The polyacetal resin composition may further comprise at least one member selected from the group consisting of an antioxidant, a heat stabilizer, a processing stabilizer, a weather (light)-resistant stabilizer, an impact resistance improver, a gloss control agent, an agent for improving sliding property, a coloring agent, and a filler. Such a resin composition improves stability of the polyacetal resin and inhibits formaldehyde emission.