Cytotoxic constituents ofPsoralea corylifolia

A coumestan derivative, psoralidin (1) was found to be a cytotoxic principle of the seeds of Psoralea corylifolia L. (Leguminosae) with the IC50 values of 0.3 and 0.4 microg/ml against the HT-29 (colon) and MCF-7 (breast) human cancer cell lines, respectively. A coumarin, angelicin (2) was also isolated as a marginally cytotoxic agent along with an inactive compound, psoralen (3) from the plant. The isolates 1-3 were not active against the A541 (lung) and HepG2 (liver hepatoma) cancer cell lines.     

Antitumor activity of echinosporin

Echinosporin isolated from a Streptomyces culture showed antitumor activity against rodent tumor models such as leukemia P388, P388/VCR, and fibrosarcoma Meth 1. It was marginally active against melanoma B16 and sarcoma 180. It was not active against Lewis lung carcinoma and xenograft MX-1. It inhibited the colony formation of HeLa S3 cells with a wide shoulder at low dose ranges. DNA, RNA, and protein synthesis were inhibited by echinosporin. It depressed WBC with nadir on day 3, but the recovery to the normal level after echinosporin injection was more rapid than that after mitomycin C.     

Antitumor activity ofTrichosanthes kirilowii

The activity-directed fractionation upon the MeOH extract of the root ofTrichosanthes kirilowii led to the isolation of eight cucurbitane triterpenes namely cucurbitacin B (I), isocucurbitacin B (II), cucurbitacin D (III), isocucurbitacin D (IV), 3-epi-isocucurbitacin B (V), dihydrocucurbitacin B (VI), dihydroisocucurbitacin B (VII) and dihydrocucurbitacin E (VIII), as active principles. All isolates were shown to exhibit significant cytotoxicity against cultured human tumor cells, including A-549, SK-OV-3, SK-MEL-2, XF-498 and HCT 15, with an exceptionally high potency.     

Antitumor activity of arylacetylshikonin analogues

Twenty one phenylacetylshikonin analogues were synthesized from various substituted phenyl acetic acids and their cytotoxicity values against A549, K562 and L1210 cell lines and antitumor action in mice bearing S-180 cells were measured. All of phenylacetylshikonin analogues expressed a potent cytotoxicity (ED₅₀, 0.1–1.80 μg/ml) against L1210 and K562 cells. L 1210 cells were the most sensitive to shikonin analogues among these cells. Except 4-methoxyphenylacetylshikonin (0.098μg/ml) and α-acetoxyphenylacetylshikonin (0.10μg/ml), all other shikonin derivatives showed higher ED₅₀ values than phenylacetylshikonin (0.13μg/ml) in L 1210. In K562 cell, α-substitution of phenylacetylshikonin (0.1 μg/ml), while other substitutions increased it slightly; 4-methoxyphenylacetylshikonin (0.033 μg/ml) showed a exceptionally good cytotoxicity against K562 cell. 4-Halogenation tended to decrease the cytotoxic effect on L1210 cells, while it enhanced the effect on K562; 4-bromophenylacetyl [ED₅₀ (L1210)=1.76 μ/ml, ED₅₀ (K 562)=0.32 μg/ml] and 4-chlorophenylacetyl shikonin [ED₅₀ (L 1210)=1.64 μg/ml, ED₅₀ (K562)=0.32 μg/ml]. In contrast, A549 cells were much less sensitive to these shikonin analogues which showed ED₅₀ values of 1.5–13.5 μg/ml. Most of phenylacetylshikonin derivatives showed good antitumor activity in mice bearing S-180 cells. α-A-cetoxyphenylacetylshikonin and 4-dimethylaminophenylacetylshikonin showed highest T/C value (192–195%), implying that introduction of α-acetyl or of 4-dimethyl amino group gave a positive effect on the antitumor activity. Introduction of 4-dimethylamino group enhanced the antitumor activity as shown for 4-dimethylaminophenylacetylshikonin (T/C, 192%). It might be due to improvement of water solubility by dimethylamino group in the molecule.     

Antitumor activity of bis-indole derivatives

This paper reports the synthesis of compounds formed by two indole systems separated by a heterocycle (pyridine or piperazine). As a primary screening, the new compounds were submitted to the National Cancer Institute for evaluation of antitumor activity in the human cell line screen. The pyridine derivatives were far more active than the piperazine derivatives. For the study of the mechanism of action, the most active compounds were subjected to COMPARE analysis and to further biological tests including proteasome inhibition and inhibition of plasma membrane electron transport. The compound bearing the 5-methoxy-2-indolinone moiety was subjected to the first in vivo experiment (hollow fiber assay) and was active. It was therefore selected for the second in vivo experiment (human tumor xenograft in mice). In conclusion we demonstrated that this approach was successful, since some of the compounds described are much more active than the numerous, so far prepared and tested 3-indolylmethylene-2-indolinones.     

番荔枝内酯类化合物体外抗肿瘤活性研究

目的研究不同结构类型的番荔枝内酯对多种人肿瘤细胞的体外抗肿瘤活性,探讨其构效关系。方法选取代表不同结构类型的番荔枝内酯单体,以人宫颈癌细胞株(Hela)、人肺癌细胞株(A-5408)、人乳腺癌细胞株(MCF-7)、人胃癌细胞株(SGC-790 1)和人肝癌细胞株(SMMC-75 41)为瘤株,用MTT法筛选各番荔枝内酯单体的抗肿瘤活性。结果邻双四氢呋喃番荔枝内酯(1~5)的抗肿瘤活性大于间位双四氢呋喃番荔枝内酯(6~10)和单四氢呋喃番荔枝内酯(11~12);间位双四氢呋喃番荔枝内酯对部分肿瘤细胞的抗癌活性比单四氢呋喃番荔枝内酯强;赤式双四氢呋喃环番荔枝内酯(6)比苏式构型(7)活性更强;顺式番荔枝内酯(12)有时显示更显著的抗癌选择活性;S构型比R构型的番荔枝内酯具有更好的选择活性。结论通过体外抗肿瘤活性研究,进一步揭示了番荔枝内酯的构效关系。     

黄芪多糖抗肿瘤活性研究

目的:研究黄芪多糖的抗肿瘤活性及对荷瘤小鼠血清中IL-2,TNF-α水平的影响。方法:以人肿瘤细胞株为模型,采用cell counting kit-8(CCK-8)检测体外抗肿瘤活性;以H22和S180为模型,检测体内抗肿瘤活性;ELISA法检测对荷瘤小鼠血清中IL-2和TNF-α水平的影响。结果:黄芪多糖对K562,SMMC-7721,HCT116和A549细胞的增殖无明显影响,在50,100 mg.kg-1时,对H22的抑瘤率分别为32.84%,45.09%,对S180的抑瘤率分别为36.55%,50.35%,且能提高荷瘤小鼠血清中IL-2和TNF-α的水平。结论:黄芪多糖无明显细胞毒活性,但体内抗肿瘤活性较强,其机制与增强机体的免疫功能有关。     

Antitumor activity of prumycin.

The antifungal antibiotic, prumycin, was studied for antitumor activity against several tumor systems. It was found to possess potential antitumor activity against a well-established mouse mammary adenocarcinoma in C3H/He mice. It was also active in prolongation of the lifespan of mice bearing P-388 lymphocytic leukemia. Moreover, prumycin did not depress the white blood cell counts in the mouse peripheral blood. However, severe alopecia was observed in mice treated with this agent at dosage level near the LD50.     

参麦注射液的抗肿瘤作用研究

目的 研究参麦注射液体内外抗肿瘤作用.方法 以小鼠肉瘤S180、肝癌H22、Lewis肺癌实体瘤模型考察参麦注射液的体内抑瘤作用;通过MTT法考察参麦注射液体外对人宫颈癌HeLa细胞和人肝癌HepG 2细胞的增殖抑制作用.结果 参麦注射液在体内对小鼠肉瘤S180、肝癌H22、Lewis肺癌均有显著的抑制作用,且呈剂量相关性,中、高剂量抑瘤率可达35％以上;体外对人宫颈癌HeLa细胞和人肝癌HepG 2细胞亦有增殖抑制作用,且呈浓度-时间相关性,48 h的IC50值分别为0.36、0.72 g/mL,72h的IC50值分别为0.21、0.29 g/mL.结论 参麦注射液体内外均有显著的抗肿瘤活性.     

姜黄素衍生物FM0807抗肿瘤活性的研究

目的 研究姜黄素衍生物FM0807的抗肿瘤活性.方法 采用四甲基偶氮唑蓝(MTT)法检测FM0807对多种肿瘤细胞生长的抑制作用,并计算IC50;建立S180小鼠移植肿瘤模型并进行体内实验,观察尾静脉和口服两种途径给予FM0807后体内抗肿瘤效果.结果体外抗肿瘤研究表明,FM0807对CA46、HELA、SGC7901...