[Ru(phen)2(3,8-2R-phen)]2+(R=OH,H,F)电子结构与抗癌活性研究

用密度泛函(DFT)法,对配合物[Ru(phen)2(3,8-2R-phen)]2+(R=OH,H,F)进行了理论计算研究.探讨了配合物的电子结构与其抗癌活性的关系:主配体上3,8位上F原子的取代有利于配合物与DNA的作用,增加配合物的抗癌活性.计算结果能较好地预测配合物与DNA的作用强度、抗癌活性及指导具有较高抗癌活性配合物的合成.     

多吡啶钌配合物[(Phen)_2Ru(dppz)](PF_6)_2的抗菌活性及机制研究

目的研究多吡啶钌配合物[(Phen)_2Ru(dppz)](PF_6)_2的抗菌活性,并进一步探讨其作用机制。方法采用最小抑菌浓度(MIC)以及最小杀菌浓度(MBC),测定无机配合物[(Phen)_2Ru(dppz)](PF_6)_2的抗菌活性。为了阐明其抗菌机制,首先利用配合物自身荧光特性和核酸染料对DNA的竞争性结合所导致的荧光强度变化,以确定配合物与DNA的结合能力;然后通过DNA凝胶电泳,检测配合物与细菌基因组DNA结合后产生的效果以检测抗菌活性的机制。结果多吡啶钌配合物[(Phen)_2Ru(dppz)](PF_6)_2对大肠杆菌以及金黄色葡萄球菌具有较强的抗菌活性,最小抑菌浓度达0.2~0.4 g·L~(-1)。荧光检测显示,配合物能够与细菌DNA发生结合,以此为基础,配合物能够干扰细菌的转录过程,抑制细菌生长。结论本研究证明了多吡啶钌配合物[(Phen)_2Ru(dppz)](PF_6)_2的抗菌活性及作用机制,为其进一步开发奠定了基础。     

铜(Ⅱ)配合物抗癌活性研究进展

金属配合物抗癌药物的研究已经成为抗肿瘤药物研究的热点之一。越来越多的研究表明铜(Ⅱ)配合物具有较好的抗癌活性。本文在参阅大量文献的基础上,对铜(Ⅱ)配合物的结构特征﹑和铂(Ⅱ)配合物的活性对比、与DNA的作用﹑与氨基酸的共价作用及对癌细胞的诱导凋亡作用等方面作了介绍。     

具有抗肿瘤活性的6,7-二氰基-二吡啶基[2,2-d:2′,3′-f]喹喔啉合钴 (II)配合物的合成、晶体结构及与DNA结合的研究(英文)

合成了 6 ,7 二氰基 二吡啶 [2 ,2 d :2′ ,3′ f]喹喔啉 (L)与钴 (II)形成的配合物 [CoL(NO3 ) 2 (CH3 CN) ](1)。通过元素分析、IR对其组成和性质进行了表征 ,并测定了它的晶体结构。结果表明 ,钴原子与 3个N原子和四个O氧原子形成变形五角双锥配位构型。体外抗肿瘤活性筛选试验结果表明 :该配合物具有强的抗肿瘤活性 ,且配合物活性明显优于配体。通过紫外滴定、粘度滴定、解链温度测定等方法研究了化合物及配体与CT DNA的作用模式及结合常数 ,结果表明配合物与CT DNA的作用模式为典型的嵌插作用 ,配合物和配体与CT DNA的结合常数分别为 4 .4 3× 10 5mol·L-1和 1.6 5× 10 5mol·L-1。     

糠酰异羟肟酸类有机锡配合物的合成及其抗癌活性

目的 设计合成糠酰异羟肟酸类有机锡配合物,并进行抗癌活性测定.方法 首先合成糠酰异羟肟酸(FuHA),并以之为配体合成一系列二烃基锡配合物;运用MTT法进行糠酰异羟肟酸类有机锡配合物对血癌K562细胞和骨髓瘤细胞EP-20的体外抗癌活性筛选.结果合成了1个配体和5个配合物,用熔点、元素分析、FT-IR、1H-NMR和13C-NMR等方法进行了结构表征,R2Sn(L)2型化合物为六配位畸变八面体,而[R2Sn(L)]2O型化合物为五配位双核三角双锥结构.结论正丁基锡和苯基锡配合物具有明显的抗癌活性.     

铂(Ⅳ)类配合物的合成及其抗肿瘤活性

目的寻求高效低毒的新一代铂类抗肿瘤药物。方法以六氯合铂 (Ⅳ )酸钾 (K2 PtCl6)为原料 ,设计合成了一系列顺铂 (cisplatin)类似物 ,将其依次氧化、酰化 ,合成了 11个新型铂 (Ⅳ )类配合物 ,结构通式为 :PtCl2 (OR1) 2 (NH2 R) 2 。并以溴化乙锭 (Etd)为荧光探针 ,通过配合物与DNA相互作用而引起体系的荧光变化 ,测定最大荧光淬灭百分率 (Rm) ,计算结合常数Km ,由此推测配合物抗癌活性。结果所合成铂 (Ⅳ )配合物的化学结构由元素分析和光谱分析所证实 ,其中 7个化合物 (6c～ 6e ,7c～7f)尚未见文献报道。试验测得受试配合物Rm值和Km计算值均较顺铂低 ,其活性顺序为 :顺铂 >6a >6c>6d。结论铂 (Ⅳ )配合物是一类具有重要研究价值和开发前景的抗肿瘤剂。     

双（烷氧羰甲基）—二碘化锡配合物的合成,表征及抗癌活性研究

本文合成了６种未见文献报道的双（烷氧羰甲基）二碘化锡配合物，利用红外光谱，核磁共振氢谱等对这些配合物进行了表征，其中部分配合物的体外抗癌活性筛选表明其抗Ｅｈｒｌｉｃｈ腹水癌活性不及阿克拉霉素Ａ。     

大黄酸金属配合物的结构及对人肝癌HepG2细胞增殖的抑制作用

目的:以大黄酸和相应金属盐为原料,合成3种金属配合物,并对其结构进行表征,比较其抗癌活性大小。方法:采用核磁共振氢谱法、红外光谱法、紫外光谱法、滴定法、原子吸收光谱法进行结构表征;采用MTT法测试三种配合物对于人肝癌Hep G2细胞的抑制作用。结果:通过光谱法证实有配合物生成,并推测出其可能结构。MTT测试显示配合物和配体均具有一定的抗癌活性,其中大黄酸-Fe(Ⅲ)抗癌活性最强,其IC50值达17.44μg.m L-1,优于配体大黄酸(IC50=116.741μg.m L-1),大黄酸-Cu(Ⅱ)(IC50=54.427μg.m L-1),大黄酸-Cr(Ⅲ)(IC50=63.584μg.m L-1)。结论:大黄酸金属配合物抗癌活性相比配体增强。     

炔基膦金（Ⅰ）配合物抗肿瘤活性研究进展

顺铂抗肿瘤活性的发现促使人们寻找新的金属配合物作为潜在的抗癌药物，其中金配合物作为抗癌药物的研究受到广泛关注。炔基膦金（Ⅰ）配合物引起的明显抗增殖作用源于其新的作用机制，同时由于其独特的化学性质和相关的配位方式，炔基膦金（Ⅰ）配合物作为未来以金为基础的抗癌药物成为该领域研究的热点之一。综述近年来炔基膦金（Ⅰ）配合物的抗肿瘤活性研究进展，包括炔基膦金（Ⅰ）配合物的结构特点、优化设计、协同药效和诊疗活性等，以期为相关研究和应用提供参考。     

铂配合物的抗癌活性与其结构间的关系

本文用CNDO/2方法计算了[(NH₃)₂PtX₂],[(CH₃NH₂)₂PtX₂],[enPtX₂]和[1,2—(NH₂)₂C₆H₁₀)PtX₂]四个系列的23种配合物的电子结构,并用配合物的抗癌实验指标与由量子化学计算所得结果进行线性回归,得到七个回归方程,讨论了配合物的结构和活性间的关系。结果表明,合成一种毒性低、剂量小、活性高的配合物,不但要考虑胺配体对配合物抗癌活性的影响,而且酸根配体对配合物的活性也起着重要的作用。     

Anti-invasive and anti-adhesive activities of a recombinant disintegrin, r-viridistatin 2, derived from the Prairie rattlesnake (Crotalus viridis viridis)

Snake venom disintegrins inhibit platelet aggregation and have anti-cancer activities. In this study, we report the cloning, expression, and functional activities of a recombinant disintegrin, r-viridistatin 2 (GenBank ID: JQ071899), from the Prairie rattlesnake. r-Viridistatin 2 was tested for anti-invasive and anti-adhesive activities against six different cancer cell lines (human urinary bladder carcinoma (T24), human fibrosarcoma (HT-1080), human skin melanoma (SK-Mel-28), human colorectal adenocarcinoma (CaCo-2), human breast adenocarcinoma (MDA-MB-231) and murine skin melanoma (B16F10)). r-Viridistatin 2 shares 96% and 64% amino acid identity with two other Prairie rattlesnake medium-sized disintegrins, viridin and viridistatin, respectively. r-Viridistatin 2 was able to inhibit adhesion of T24, SK-MEL-28, HT-1080, CaCo-2 and MDA-MB-231 to various extracellular matrix proteins with different affinities. r-Viridistatin 2 decreased the ability of T24 and SK-MEL-28 cells to migrate by 62 and 96% respectively, after 24 h of incubation and the invasion of T24, SK-MEL-28, HT-1080 and MDA-MB-231 cells were inhibited by 80, 85, 65 and 64% respectively, through a reconstituted basement membrane using a modified Boyden chamber. Finally, r-viridistatin 2 effectively inhibited lung colonization of murine melanoma cells in BALB/c mice by 71%, suggesting that r-viridistatin 2 could be a potent anti-cancer agent in vivo.     

N-芳乙基异喹啉衍生物的合成及其抗肿瘤活性研究

本研究采用一种简便的新方法设计合成了一系列全新结构的N-芳乙基异喹啉衍生物, 并对其体外抗肿瘤活性进行了评价。其中化合物9a表现出较强的抗肿瘤活性, 对人肝癌HepG2和大肠癌HCT116细胞的IC₅₀值分别为2.52和1.99 μg·mL^–1。初步作用机制显示, 9a可以将HepG2细胞周期阻滞于S期, 使细胞增殖受阻, 达到抗肿瘤效果。     

2-羧甲氧基苯甲醛苯甲酰腙及其配合物抑菌活性的构效关系

目的 :研究 2 羧甲氧基苯甲醛苯甲酰腙及其配合物的抑菌活性。方法 :合成配体 2 羧甲氧基苯甲醛苯甲酰腙及其配合物 ,采用K B法检测其对金黄色葡萄球菌、大肠埃希菌和枯草芽胞杆菌的生长抑制作用。结果 :配体 2 羧甲氧基苯甲醛苯甲酰腙仅抑制金黄色葡萄球菌的生长 ,其配合物能抑制金黄色葡萄球菌、大肠埃希菌和枯草芽胞杆菌的生长 ,形成抑菌环 ,尤其Cu配合物形成抑菌环直径最大。结论 :2 羧甲氧基苯甲醛苯甲酰腙与金属、稀土形成的配合物均有一定的抑菌作用 ,Cu配合物抑菌活性最强     

Facile radiosynthesis of fluorine-18 labeled beta-blockers. Synthesis, radiolabeling, and ex vivo biodistribution of [18F]-(2S and 2R)-1-(1-fluoropropan-2-ylamino)-3-(m-tolyloxy)propan-2-ol

An efficient and general method has been developed for fluorine-18 labeling of beta-blockers that possess the propanolamine moiety. A new synthetically versatile intermediate, 3-(1-(benzyloxy)propan-2-yl)-2-oxooxazolidin-5-yl)methyl 4-methylbenzenesulfonate (13), was prepared and can be conjugated to any phenoxy core. To demonstrate the synthetic methodology, fluorinated derivatives of toliprolol were prepared, namely, [(18)F]-(2S and 2R)-1-(1-fluoropropan-2-ylamino)-3-(m-tolyloxy)propan-2-ol ((2S and 2R)-[(18)F]1). The radiosyntheses were accomplished in <1 h, with 20-24% (uncorrected for decay, n = 7) radiochemical yields, >96% radiochemical and >99% enantiomeric purities, with specific activities of 0.9-1.1 Ci/micromol (EOS). Ex vivo biodistribution studies with the radiotracers demonstrated excessively rapid washout that may limit their use for cerebral PET imaging.     

cis-bis(pyridine)platinum(II) organoamides with unexpected growth inhibition properties and antitumor activity.

The platinum(II) organoamides [Pt(NRCH2)2L2] (L = pyridine (py), R = p-HC6F4, C6F5,p-IC6F4,p-CIC6F4,p-C6F5C6F4; L = 4-methylpyridine, R = p-HC6F4) and [Pt(NRCH2CH2NR')(py)2] (R = p-HC6F4, R' = C6F5, p-BrC6F4, or p-MeC6F4) inhibit the growth of murine L1210 leukemia cells in culture with ID50 values for continuous exposure in the range 0.6-2.7 microM. Representative complexes are also active against L1210 cells in 2-h pulse exposures, as well as against the cisplatin-resistant variant L1210/DDP and human colonic carcinoma cell lines HT 29 and BE. Three complexes [Pt(NRCH2)2L2] (R = p-HC6F4, C6F5, or p-IC6F4) have good activity (T/C greater than or equal to 180%) against P388 leukemia in mice, and all other compounds tested are active except when R = p-C6F5C6F4, L = py. Although the molecular basis of the biological activity of these complexes is not known, the observation of good activity for amineplatinum(II) compounds with no hydrogen substituents on the nitrogen donor atoms introduces a new factor in the anticancer behavior of platinum(II) complexes.     

The herbicide dicamba (2-methoxy-3,6-dichlorobenzoic acid) interacts with mitochondrial bioenergetic functions

The effects of dicamba, a widely used broad-leaf herbicide, on rat liver mitochondrial bioenergetic activities were examined. The results obtained for state 4 respiration indicate not only an uncoupling effect, the result of an increase on the permeability of inner mitochondria membrane to protons, but also a strong inhibitory effect on the redox complexes. State 3 and respiration uncoupled by FCCP (carbonylcyanide p-trifluoromethoxyphenylhydrazone) were inhibited to approximately the same extent, i.e. by about 70%. Depression of respiratory activity is essentially mediated through partial inhibition of mitochondrial complexes II and III. ATPase activity was much less depressed by dicamba than ATP synthase activity. Therefore, a considerable part of the inhibition observed on ATP synthase is the result of an inhibition on the redox complexes. The loss of phosphorylation capacity, induced by dicamba, was in the last analysis not only the result of a direct effect of dicamba on the enzymatic complex (F(0)-F(1) ATPase) but also the result of a deleterious effect on the integrity of the mitochondrial membrane, which can promote an inhibition of the respiratory complexes and an increase of the proton permeability of the inner membrane.     

Antifungal and antibacterial activity of 2-acetylpyridine-(4-phenylthiosemicarbazone) and its metal (II) complexes.

2-Acetylpyridine-(4-phenylthiosemicarbazone) and its metal (II) complexes have been synthesized and characterized by chemical and spectral methods. They were studied for their antibacterial and antifungal activities in vitro. The ligand and its metal (II) complexes exibited significant activity against a wide spectrum of bacteria and fungi.     

Acetylsalicylic acid-induced oxidative stress, cell cycle arrest, apoptosis and mitochondrial dysfunction in human hepatoma HepG2 cells

It is widely accepted that non-steroidal anti-inflammatory drugs (NSAIDs), including aspirin, reduce the risk of cancer. The anti-cancer and anti-inflammatory effects of NSAIDs are associated with the inhibition of prostaglandin synthesis and cyclooxygenase-2 activity. Several other mechanisms which contribute to the anti-cancer effect of these drugs in different cancer models both in vivo and in vitro are also presumed to be involved. The precise molecular mechanism, however, is still not clear. We investigated, therefore, the effects of acetylsalicylic acid (ASA, aspirin) on multiple cellular and functional targets, including mitochondrial bioenergetics, using human hepatoma HepG2 cancer cells in culture. Our results demonstrate that ASA induced G0/G1 cell cycle arrest and apoptosis in HepG2 cells. ASA increased the production of reactive oxygen species, reduced the cellular glutathione (GSH) pool and inhibited the activities of the mitochondrial respiratory enzyme complexes, NADH-ubiquinone oxidoreductase (complex I), cytochrome c oxidase (complex IV) and the mitochondrial matrix enzyme, aconitase. Apoptosis was triggered by alteration in mitochondrial permeability transition, inhibition of ATP synthesis, decreased expression of the anti-apoptotic protein Bcl-2, release of cytochrome c and activation of pro-apoptotic caspase-3 and the DNA repairing enzyme, poly (-ADP-ribose) polymerase (PARP). These findings strongly suggest that ASA-induced toxicity in human hepatoma HepG2 cells is mediated by increased metabolic and oxidative stress, accompanied by mitochondrial dysfunction which result in apoptosis.     

Thymoquinone (2-Isopropyl-5-methyl-1, 4-benzoquinone) as a chemopreventive/anticancer agent: Chemistry and biological effects

Cancer remains the topmost disorder of the mankind and number of cases is unceasingly growing at unprecedented rates. Although the synthetic anti-cancer compounds still hold the largest market in the modern treatment of cancer, natural agents have always been tried and tested for potential anti-cancer properties. Thymoquinone (TQ), a monoterpene and main ingredient in the essential oil of Nigella sativa L. has got very eminent rankings in the traditional systems of medicine for its anti-cancer pharmacological properties. In this review we summarized the diverse aspects of TQ including its chemistry, biosynthesis, sources and pharmacological properties with a major concern being attributed to its anti-cancer efficacies. The role of TQ in different aspects involved in the pathogenesis of cancer like inflammation, angiogenesis, apoptosis, cell cycle regulation, proliferation, invasion and migration have been described. The mechanism of action of TQ in different cancer types has been briefly accounted. Other safety and toxicological aspects and some combination therapies involving TQ have also been touched. A detailed literature search was carried out using various online search engines like google scholar and pubmed regarding the available research and review accounts on thymoquinone upto may 2019. All the articles reporting significant addition to the activities of thymoquinone were selected. Additional information was acquired from ethno botanical literature focusing on thymoquinone. The compound has been the centre of attention for a long time period and researched regularly in quite considerable numbers for its various physicochemical, medicinal, biological and pharmacological perspectives. Thymoquinone is studied for various chemical and pharmacological activities and demonstrated promising anti-cancer potential. The reviewed reports confirmed the strong anti-cancer efficacy of thymoquinone. Further in-vitro and in-vivo research is strongly warranted regarding the complete exploration of thymoquinone in ethnopharmacological context.     

(2,2':6',2"-Terpyridine)platinum(II) complexes are irreversible inhibitors of Trypanosoma cruzi trypanothione reductase but not of human glutathione reductase

(2,2':6',2"-terpyridine)platinum(II) complexes possess pronounced cytostatic activities against trypanosomes and leishmania. As shown here, the complexes are irreversible inhibitors of trypanothione reductase (TR) from Trypanosoma cruzi, the causative agent of Chagas' disease. The most effective derivatives are the (4'-chloro-2, 2':6',2"-terpyridine)platinum(II) ammine and the (4-picoline)(4'-p-bromophenyl-2,2':6',2" -terpyridine)platinum(II) complexes which in the presence of NADPH inhibit TR with second-order rate constants of about 1.3 x 10(4) M(-1) s(-1). The modified enzyme species possess increased oxidase activities. The inhibition is not reversed upon dialysis or treatment with low-molecular-mass thiols. Kinetic and spectroscopic data suggest that Cys52 in the active site has been specifically altered. Inhibition of this key enzyme of parasite thiol metabolism probably contributes to the antitrypanosomal activity of the compounds. In contrast to the parasite enzyme, most (terpyridine)platinum complexes interact only reversibly with human glutathione reductase and an initial inhibition is completely abolished during the course of the assay.