Inhibition of proliferation on some neoplastic cell lines-act of carvedilol and captopril

The present work examines the effects of beta and alpha1-adrenoceptor antagonist carvedilol, and angiotensin converting enzyme (ACE) inhibitor captopril, on in vitro growth of tumor cell lines derived from breast tumor (MDA-MB-361), melanoma (Fem-x), cervix adenocarcinoma (HeLa) and human myelogenous leukemia (K562). Carvedilol or captopril were applied on malignant cells at 0.1, 1, 5, 10 and 50 micromol. Cell survival was determined 48 hrs after drugs action by MTT. On all cell lines tested, carvedilol was a very potent inhibitor of cell proliferation. The order of sensitivity of various human cell lines to carvedilol's antiproliferative action was: myelogenous leukemia K562 (IC50 = 22.66 +/- 2.14 micromol), > cervix carcinoma HeLa (IC50 = 30.56 +/- 5.16 micromol), > melanoma Fem-x (IC50 = 32.17 +/- 5.75 micromol), > breast tumor MDA-MB-361 (IC50 = 35.04 +/- 2.95 micromol). In contrast, captopril, used in doses from 0.1-50 micromol, was ineffective (IC50 > 50 micromol) to the same cell lines. It is important to note that captopril in concentrations > 1 micromol led to a statistically significant increase in the percent of survived melanoma Fem-x cells (p < 0.05). Understanding the action of these established and clinically accepted agents could provide a basis for design of improved therapeutic regimens in the treatment of cancer diseases.     

白花前胡中白花前胡甙和Pd-C-I的分离和鉴定

从白花前胡(Peucedanum,praeruptorum)根中分得7个化合物,经化学方法和光谱分析分别鉴定为Pd-C-I(I),白花前胡甙(II),香草酸(III),没食子酸(IV),nodakenin(V),rutarin(VI)和isorutarin(VII)。II为新化合物,其化学结构为4-O-β-D-吡喃葡萄糖基-3-甲氧基苯丙酮,命名为白花前胡甙。I为首次从白花前胡中分得的线型二氢吡喃香豆素类化合物,这对前胡属植物化学分类学有一定意义。还利用2DNMR纠正了文献中关于化合物I和VII的个别碳信号归属的错误。     

兰尼定对大鼠平滑肌细胞的肾上腺素能作用(英文)

电场刺激后释放的内源性去甲肾上腺素可引起大鼠输精管的双相收缩。初始的短暂收缩可被30μmol/L兰尼定和2μmol/L硝苯啶减弱,而后继的收缩部分可被2μmol/L硝苯啶消除,但被30μmol/L兰尼定增强。 外加的去甲肾上腺素也可产生输精管的双相收缩,这两相都能被2 μmol/L硝苯啶抑制,兰尼定30μmol/L可使两个相的收缩都减弱50％。我们推测兰尼定的结合位点在输精管的内质网。兰尼定对α-肾上腺素能刺激的不同相的作用不一致,表明对α-肾上腺素能的刺激一收缩偶合有两种方式。     

支气管动脉栓塞术后并发症的预防及护理

0　引言　大咯血原因很多 .炎症、支气管扩张、肺癌、肺结核、肺动静脉瘘等 .但因支气管动脉畸形引起的大咯血尚未见专题报道 .现将我院 1992年 10月份以来行数字减影血管造影 (DSA )检查 ,确诊支气管动脉畸形行支气管动脉栓塞(BAE)治疗大咯血术后并发症的预防与护理报道如下 :1　临床资料　 6 (男 5 ,女 1)例大咯血患者 ,年龄 16～ 5 9岁 .均因无明显诱因 ,反复咯血而多次保守治疗 ,一次或 2 4h内咯血量为 40 0～ 10 0 0 m L ,病程最长 13a.入院后行 CT、纤维支气管镜、支气管碘油造影等栓查 ,均未见明显异常 ,后因保守治疗无效时行 D…     

抗癌及癌化学预防药物的研究:3-α-酮醛香豆素衍生物的合成及其抗致突活性与结构间的关系

α-酮醛及其衍生物在抗病毒、抗肿瘤方面有一定活性。我们合成了18个新的3-α-酮醛香豆素衍生物,研究该类化合物的质谱裂解方式与氢核磁共振谱的特征峰。体外药理筛选发现其中部分化合物有不同程度的抗致突活性,对其构效关系进行了分析,并提出了这类化合物产生抗致突活性的可能亚结构。     

抗癌及癌化学预防药物的研究：3α酮醛香豆素衍生物的合成及其抗致突活性与结构间的关系

α酮醛及其衍生物在抗病毒、抗肿瘤方面有一定活性。我们合成了１８个新的３α酮醛香豆素衍生物，研究该类化合物的质谱裂解方式与氢核磁共振谱的特征峰。体外药理筛选发现其中部分化合物有不同程度的抗致突活性，对其构效关系进行了分析，并提出了这类化合物产生抗致突活性的可能亚结构     

中药抗HIV的有效活性成分的研究进展

0 引言 艾滋病又称为获得性免疫缺陷综合征（Acquired Immuno-Deficiency Syndroma,AIDS）,是继癌症之后严重威胁人类健康和生存的一种传染性疾病．据联合国艾滋病规划署2008-07-29发布的报告,目前全球约有3300多万人感染艾滋病病毒（HIV）．在我国,艾滋病流行形势也十分严峻．引起艾滋病的病原体是人类免疫缺陷病毒（Human Immuno—deficiency Virus,HIV）,或称为艾滋病病毒．HIV侵入人体后主要破坏人体的免疫系统,使人体发生多种难以治愈的感染和肿瘤,     

Undifferentiated (embryonal) sarcoma of the liver: radiologic- pathologic correlation

Undifferentiated (embryonal) sarcoma (UES) is an uncommon malignant mesenchymal hepatic tumor that occurs in older children and young adults. Fourteen cases are correlated with radiologic and pathologic findings. Radiologic findings reflect the spectrum of solid to cystic appearances observed in the gross specimens. Sonography typically demonstrates a large mass that may be predominantly solid with many small anechoic spaces or may be cystic. Computed tomography reveals a hypodense mass with hyperdense septa of variable thickness and a dense peripheral rim corresponding to the fibrous pseudocapsule of the tumor. Angiographically, UES is usually hypovascular with tumoral vessels, although hypervascular and avascular patterns occur. Prognosis of UES is poor, with a median survival of less than 1 year. Radiologists should be familiar with this malignant tumor since it may present as a large cystic hepatic mass, suggestive of a benign lesion.     

Antimelanoma immunity in vitiligo and melanoma patients

Cutaneous melanoma and vitiligo are diseases etiology of which evolves around melanocytes. The nature of immunological disturbances associated with these diseases is not elucidated. The experiments performed in this work were aimed to determine antimelanoma immunotoxicity in patients with melanoma and patients with vitiligo. Twelve patients with melanoma, ten patients with vitiligo and seventeen healthy volunteers were studied. The cytotoxicity of PBMC was evaluated indirectly through determination of target melanoma (Fem-x) or control tumor (HeLa) cell survival, in the presence of 15% of AB or autologous sera, by MTT test. The mean values of antimelanoma cytotoxicity in AB serum were similar in both patients groups and in controls. However, the frequency of patients with the enhanced cytotoxicity against melanoma cells, in relation to control tumor cells, was lower in both patients groups than in controls. The intensity of antimelanoma cell-mediated cytotoxicity in melanoma patients, in the presence of autologous serum, was significantly lower in comparison to that found in control subjects and vitiligo patients (p<0.014, in both cases). This indicates that some factors from melanoma patient's sera contribute to impairment of the cytotoxicity of autologous PBMC, while other factors from the serum of vitiligo patients and control subjects enhanced their PBMC antimelanoma cytotoxicity.