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1.
蛇葡萄素体内外对小鼠B16黑色素瘤侵袭和转移的抑制作用   总被引:14,自引:1,他引:14  
目的 :研究蛇葡萄素对B16小鼠黑色素瘤体内外抗侵袭和转移的作用。方法 :B16细胞由尾静脉注入C5 7BL/ 6小鼠体内建立实验性肺转移模型 ,蛇葡萄素以 3个剂量从接种瘤细胞前一天腹腔给药 ,连续 18d ,于停药后第 2天观察肺转移瘤灶数。B16细胞经蛇葡萄素处理 3d ,用具有聚碳酸酯和重建基底膜 (Matrigel)的Tran swell小室侵袭模型 ,研究药物处理后细胞侵袭、趋化运动、粘附能力的改变。结果 :剂量为 15 0 ,200 ,250mg·kg-1的蛇葡萄素可抑制小鼠肺转移瘤灶形成 ,与溶剂对照组比 ,抑制率分别为 30.97% ,40.58% ,61.16% (P<0.0 5)。经 20,40,80μmol·L-1各浓度蛇葡萄素处理后 ,对B16细胞侵袭人工基底膜的抑制率分别为 36.06% ,59.58% ,79.09% (P<0 .01) ;对细胞的趋化运动抑制率分别为 51.59% ,56.51% ,66.75% (P<0.01) ;显著降低B16细胞与基质成分层粘连蛋白、纤维粘连蛋白及Matrigel的粘附作用。 结论 :蛇葡萄素具有抑制黑色素瘤的侵袭和转移的作用。  相似文献   

2.
目的 探讨复色1 号方对小鼠B16 黑素瘤细胞增殖及酪氨酸酶活性的影响.方法 采用MTT 法测定不同浓度的复色1 号方对小鼠B16 黑素瘤细胞增殖的影响,多巴速率氧化法测定对酪氨酸酶活性的影响,对其结果进行统计分析.结果 复色1 号方浓度在0.001~0.01g/l,范围内对小鼠B16 黑素瘤细胞的增殖与对照组相比无统计学意义(P>0.05),0.05~0.1g/l 浓度范围内对小鼠B16 黑素瘤细胞的增殖与对照组相比有显著意义(P<0.05),呈现一定的抑制作用;复色1 号方在0.001~0.1g/l 浓度范围内对小鼠B16 黑素瘤细胞中酪氨酸酶活性的影响与对照组相比,各浓度含药培养基组的A 值均有显著性差异(P<0.05),呈剂量依赖性激活作用.在0.001~ 0.01g/l 浓度范围内,复色1 号方的最佳激活浓度为0.01g/l.结论 复色1 号方没有促进小鼠B16 黑素瘤细胞增殖的作用;在一定浓度范围内(0.001~0.1g/l),对小鼠B16 黑素瘤细胞酪氨酸酶的活性呈剂量依赖型激活作用.  相似文献   

3.
A reinvestigation of the fruiting bodies of the mushroom Leucopaxillus gentianeus, allowed the isolation of two minor cucurbitane triterpenes, namely, cucurbitacin D (5) and the new metabolite 16-deoxycucurbitacin B (6). The latter compound lacks an oxygenated substituent at C-16, an unprecedented structural feature among congeners of cucurbitacin B. The cucurbitanes present in the fruiting bodies were compared with those extracted from mycelia grown on the modified Melin-Norkans (MMN) culture medium. Cucurbitacins B (1) and D (5), as well as leucopaxillones A (3) and B (4), were isolated from both sources; in contrast, 16-deoxycucurbitacin B (6) and a mixture of fatty acid esters of cucurbitacin B (2) were absent in the mycelia. A new triterpene, 18-deoxyleucopaxillone A (7), was isolated from the mycelia, but was not detected in the fruiting bodies. The antiproliferative activity of the isolated triterpenes was determined against the NCI-H460 human tumor cell line, in comparison with the antitumor compound topotecan, a well-known topoisomerase I inhibitor.  相似文献   

4.
Napyradiomycin SR ( 1), 16-dechloro-16-hydroxynapyradiomycin C2 ( 2), 18-hydroxynapyradiomycin A1 ( 3), 18-oxonapyradiomycin A1 ( 4), 16-oxonapyradiomycin A2 ( 5), 7-demethyl SF2415A3 ( 6), 7-demethyl A80915B ( 7), and ( R)-3-chloro-6-hydroxy-8-methoxy-alpha-lapachone ( 8) were isolated from the culture broth of Streptomyces antimycoticus NT17. These compounds are derivatives of the napyradiomycins isolated previously from Chainia rubra or Streptomyces aculeolatus. The structures of the new compounds, some of which exhibit antibacterial activities, were established by comparing their NMR data with data of related known compounds. The unique structure of 1, containing a highly strained ring, was established by NMR and was confirmed by X-ray analysis. Two of the compounds are C-16 stereoisomers of napyradiomycin A2 and are named napyradiomycins A2a ( 9a) and A2b ( 9b).  相似文献   

5.
In a study to investigate the relationship between the chemical structure and the differentiation-inducing activity of pentacyclic triterpenes, several lupane, oleanane, and ursane triterpenes were prepared and their effects on B16 2F2 melanoma cell differentiation and growth were examined. Eleven lupane triterpenes used in this study acted on the melanoma cells as a melanogen, but no induction of melanogenesis of B16 2F2 cells by oleanane and ursane was detected. The differences at C-17 of the lupane series and acetylation of the OH group at C-3 did not markedly influence their activities. However, the ED(50) value for up-regulation of melanin biosynthesis was markedly decreased by the oxidation of the OH group at C-3 of lupeol (1). Betulinic acid (11), its methyl ester (12), lup-28-al-20(29)-ene-3beta-ol (9), and lup-28-al-20(29)-en-3-one (10) inhibited B16 2F2 cell proliferation by induction of apoptosis. These findings suggested that the carbonyl group at C-17 might be essential for the apoptotic effects of these compounds on B16 2F2 cells.  相似文献   

6.
An ethanolic extract of the roots of Barringtonia racemosa afforded two novel neo-clerodane-type diterpenoids, methyl-15, 16-epoxy-12-oxo-3,13(16),14-neo-clerodatrien-18, 19-olide-17-carboxylate (nasimalun A, 1) and dimethyl-15,16-epoxy-3, 13(16),14-neo-clerodatrien-17,18-dicarboxylate (17-carboxymethylhardwickiic acid methyl ester, nasimalun B, 2) by NMR and MS analyses and by comparison of their spectral data with related compunds. The relative stereochemistry of the asymmetric centers in 1 and 2 was determined by selective 1D NOESY experiments.  相似文献   

7.
探讨红景天、蛹虫草、大黄配伍(中药复方FF16)对小鼠胰岛素抵抗的治疗作用及其作用机制。结果显示,中药复方FF16具有明显增加机体整体和组织胰岛素敏感性作用;分别使IRF小鼠和KKAy小鼠的受损的胰岛素耐量之AUC降低24.1%,38.5%;升高的血清胰岛素水平下降46.0%,30.4%,HOMA-IR降低52.4%,81.2%;降低的GIR增加了119.3%,202.4%。FF16使KKAy小鼠全身胰岛素敏感性指数ISWBI增加了1.0倍;肝脏、脂肪和骨骼肌胰岛素依赖的葡萄糖摄取能力分别增强1.5,2.8,2.2倍。此外,FF16抑制基因重组人源蛋白酪氨酸磷酸酶(PTP1B)蛋白活性的IC50为0.225 mg.L-1;使IRF小鼠肝脏升高的蛋白PTP1B表达下调了45.8%。结果说明,中药复方FF16具有显著的胰岛素增敏作用,该作用可能与抑制PTP1B活性有关。  相似文献   

8.
Du L  Zhu T  Fang Y  Gu Q  Zhu W 《Journal of natural products》2008,71(8):1343-1351
Eleven new unusual C25 steroid isomers with bicyclo[4.4.1]A/B rings, 24- epi-cyclocitrinol (1), 20-O-methyl-24-epi-cyclocitrinol (3), 20-O-methylcyclocitrinol (4), 24-oxocyclocitrinol (7), 12 R-hydroxycyclocitrinol (8), neocyclocitrinols B (10) and D (12), erythro-23-O-methylneocyclocitrinol (13), threo-23-O-methylneocyclocitrinol (14), isocyclocitrinol B (15), and precyclocitrinol B (18), and five known steroids, cyclocitrinol (2), neocyclocitrinols A (9) and C (11), isocyclocitrinol A (16), and 22-O-acetylisocyclocitrinol A (17), were characterized from cultures of the volcanic ash-derived fungus Penicillium citrinum HGY1-5. Their structures and absolute configurations were established by spectroscopic and chemical methods together with X-ray diffraction analysis. Compounds 3, 4, and 10- 14 were determined to be artifacts on the basis of acidic transformation of 1- 4. The biosynthetic origin of these steroids derived from ergosterol was investigated by feeding (13)C-labeled acetates to the growing cultures of P. citrinum HGY1-5. The biological activities of all 16 steroids were tested using the cAMP assay on GPR12-CHO and WT-CHO cells. The results showed that compounds 1, 2, 10, 11, and 14 could induce the production of cAMP in GPR12-transfected CHO cells.  相似文献   

9.
低分子灵芝多糖体内抗肿瘤活性研究及其作用机制探讨   总被引:2,自引:0,他引:2  
目的:考察三种灵芝多糖(GLPH、GLPM、GLPL)的抗肿瘤活性及其作用机制。方法:采用小鼠移植瘤研究方法检测了三种灵芝多糖对S180(骨肉瘤)、Heps(肝癌)、EAC(腹水癌)及BB16BL6(黑色素瘤)的抑制作用,并通过各种免疫因子及TH1/TH2比值检测来研究其可能的作用机制。结果:灵芝多糖(GLPL)对S180、Heps、EAC、B16BBL6均有明显的抑制作用,而灵芝多糖(GLPH、GLPM)的作用不明显。且研究显示GLPL能够显著增加细胞因子IFN-γ、IL-2表达水平,而对IL-6、IL-10作用不明显。结论:灵芝多糖(GLPL)具有良好的抑制肿瘤S180、Heps、EAC、BB16BL6生长的活性,且这种抑制活性可能是通过促进免疫细胞因子的分泌而发挥作用。  相似文献   

10.
Five ent-kaurane diterpenoids, 6beta,7beta,14beta-trihydroxy-1alpha,19-diacetoxy-7alpha,20-epoxy- ent-kaur-16-en-15-one (1), 1alpha,6beta,7beta-trihydroxy-11alpha,19-diacetoxy-7alpha,20-epoxy-ent-kaur-16-en-15-one (2), 6-hydroxy-1alpha,19-diacetoxy-6,7-seco-ent-kaur-16-en-15-one-7,20-olide (3), 19-hydroxy-1alpha,6-diacetoxy-6,7-seco- ent-kaur-16-en-15-one-7,20-olide (4), and 6-aldehyde-1alpha,19-diacetoxy-6,7-seco- ent-kaur-16-en-15-one-7,20-olide (5), along with 10 known ent-kaurane diterpenoids, pseurata C (6), longikaurin C (7), effusanin C (8), longikaurin B (9), longikaurin D (10), effusanin D (11), excisanin B (12), lasiokaurin (13), megathyrin A (14), and loxothyrin A (15), were isolated from the aerial parts of Isodon japonicus. Their structures were determined on the basis of spectroscopic (1D-, 2D-NMR and MS) and chemical evidence. The isolates were evaluated for their inhibitory effects on LPS-induced production of nitric oxide in murine macrophage RAW264.7 cells.  相似文献   

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