石蒜内铵(AT-1840)对小鼠艾氏腹水癌细胞超微结构的影响

AT-1840对数种动物肿瘤有明显的抑制作用。临床试用治疗数百例晚期肿瘤患者也证明对胃癌及卵巢癌有一定的治疗作用。为了探讨该药的作用机理,我们用扫描电镜及透射电镜观察了AT-1840对小鼠艾氏腹水癌细胞(简称 ECA)超微结构的影响。     

EXPERIMENTAL STUDY ON THE CYTOCIDAL EFFECT OF AT-1840 AND PARVOVIRUS H-1 AGAINST STOMACH CANCER CELLS

We had given evidences of cytocidal effect in vitro of either parvovirus H-I(PV H-1) or AT-1840 (lycobetaine) on gastric cancer cells. They act on different phase of the cell cycle of the gastric cancer cells, with PV H-1 on the late stage of S phase and AT-1840 on M phase. Combined use of these drugs gives better killing effect than the individual drug alone. In gastric cancer-bearing nude mice (ascites and solid tumor forms), both AT-1840 and PV H-1 increased the survival peroids and decreased the size of solid tumors. Depsite these are the experimental study which may not to be the same in human being. However, the study has layed down a solid foundation for our further exploration of these two substances as anti-gastric cancer drugs in the future.     

金蒸汽激光治疗人肺腺癌裸小鼠移植瘤

应用肿瘤内照射和肿瘤表面照射两种方法在人肺腺癌裸小鼠移植瘤(lung adenocarcinoma xenograft,LAX-83)进行光动力学治疗(photodynamic therapy,PDT)的实验研究。结果表明PDT后LAX-83生长延缓。治疗后10天,肿瘤内照射组和肿瘤表面照射组之间的肿瘤体积和重量无显著差异。而在治疗组与对照组、单独激光组和单独光敏剂组之间存在显著差异。形态学观察结果表明肿瘤内照射组的病理改变比肿瘤表面照射组出现更早、更显著。后者肿瘤坏死深度在4～5mm左右,而前者则达10mm以上。光镜下发现肿瘤细胞胞浆、胞核浓缩,肿瘤细胞坏死。电镜检查提示线粒体受损最早。单独注射光敏剂和单独激光照射后均不产生肿瘤组织的显微结构和超微结构的改变。本实验证实PDT对人肺腺癌细胞的杀伤作用,为肿瘤内照射治疗的临床应用提供有益参考。     

丙双吗啉的抗肿瘤作用和吸收分布排泄研究

丙双吗啉(AT-2153)是丙亚胺(ICRF 159)的衍生物,ip 80～100mg/kg ×5d,对裸小鼠肾包膜下接种的人肺癌LAK-83移植瘤有显著的抑制作用。接种Lewis肺癌的小鼠,ig [~(14)C]AT-2153后,胃、肠和胆囊的放射性最高,其次为肺的肿瘤转移灶。给药后24和48h的尿和粪中,放射性总排出量分别为给药量的35.2和65.9％。     

RADIOIMMUNOLOCALIZATION OF XENOGRAFTED HUMAN GASTRIC ADENOCARCINOMA WITH ~(131)I-LABELED MONOCLONAL ANTIBODY RWS_(4) IN NUDE MICE

The monoclonal antibody (MAb) RWS4 specific to membrane-associated antigen of human gastric adenocarcinoma was purified by protein A-Sepharose 4B affinity chromatography and labeled with 131I by chloramine-T method. 131-RWS,, was injected (65 μCi/10μg/0.2 ml, intraperitoneally) into the stomach cancer-bearing nude mice (solid tumor about 1 cm in diameter), and its biodistribution was studied by SPECT and gamma-counter over a peroid of 7 days. A clear image of transplanted tumor was observed on the 4th day, and the image became more clear on the 6th day. After SPECT scanning, the animals were killed on the 3rd to 7th day separately and radioactivity was detected in various organs. The ratios of T/NT were calculated. The results were shown as follows: tumor/blood, was 3.41±0.29 on the 6th day and the tumor/other organs (liver, spleen, stomach, lung, heart, kidney and brain etc.) were>3. The specificity of the 131I-RWS4 was 7.74±0.65.     

细小病毒H—1对人胃癌裸小鼠移植瘤生长的抑制作用

给裸小鼠皮下接种人胃癌裸小鼠移植瘤（ＳＧＣ－７９０１）后，在瘤周围注射细小病毒Ｈ－１，结果肿瘤生长受抑制，抑制率为５８．５％，改用腹腔注射则抑制作用不明显。给ＫＭ小鼠１次腹腔注射细小病毒Ｈ－１１０＾９／ｋｇ后，未见明显毒性反应。     

两系裸小鼠繁育的初步结果

前文已报导本实验室建立的SPF动物室的设备条件以及对裸小鼠繁育管理方法。本文报导二种不同基因背景裸小鼠BALB/CA/JCL-nu/nu及Swiss-DF nu/nu,在SPF条件下繁育研究的初步结果,供国内有关单位参考。材料与方法 BALB/CA/JCL-nu/nu繁殖鼠分别于81年4月及9月二次自日本引进,前者为三对纯合子(nu/nu)裸小鼠(日本肿瘤研究所池川哲郎博士赠送),后者为7只雌性杂合子(nu/ )。Swiss-DF-nu/nu于81年11月自美国引进(Roswell Park Memorial InstituteMurphy,D.教授赠送)即3雄nu/nu,1雌