Effects of medroxyprogesterone acetate and synthetic analogue of fumagillin on endometrial cancer

本研究旨在探讨醋酸甲羟孕酮（MPA）和烟曲霉素类似物（TNP-470）对人子宫内膜腺癌生长的影响。将子宫内膜腺癌细胞ECC-1接种于经皮下注射E_2颗粒刺激的雄性裸鼠皮下。当肿瘤在<plus-minus>接种后两周达到8.0 ± 0.2mm时，患有子宫内膜腺癌的动物被随机分成四组：单独用载体（对照）、MPA（10 mg/kg体重）、TNP-470（30 mg/kg体重）或MPA和TNP-470组合处理的小鼠。每两天皮下注射载体或化合物，持续8周。MPA给药可明显抑制肿瘤的生长，且在给药2周后抑制作用更加明显。另一方面，血管生成抑制剂TNP-470对肿瘤大小增加的抑制不显著。在程度上没有差异。 ...更多信息 在单独的MPA治疗和MPA与TNP-470联合治疗之间的肿瘤减少的ee。MPA治疗后，肿瘤移植物坏死明显。进行肿瘤中血管计数和血管生成生长因子bFGF和TGF-α的免疫组织化学染色。MPA和TNP-470均未显著减少肿瘤中血管的数量和bFGF和TGF-α的免疫染色强度。为了了解MPA是否诱导肿瘤细胞凋亡和缩小肿瘤大小，在肿瘤移植物中进行TUNEL染色。对照组和MPA处理组之间的染色强度没有显著差异。最后用增殖细胞核抗原（PCNA）染色法检测肿瘤细胞的增殖能力。结果发现MPA能明显抑制子宫内膜腺癌细胞PCNA阳性细胞的数量，本研究以裸鼠为模型，探讨MPA抗子宫内膜腺癌的作用机制。然而，血管生成抑制剂对腺癌的抗增殖作用在该系统中不能被发现。少

This study was undertaken to investigate the effects of medroxyprogesterone acetate (MPA) and synthetic analogue of fumagillin (TNP-470) on the growth of human endometrial adenocarcinoma. Endometrial adenocarcinoma cells, ECC-1 cells, were inoculated subcutaneously in male nude mice stimulated by sc implantation of E_2 pellet. When the tumor size reached to 8.0<plus-minus>0.2 mm at two weeks after inoculation, the animals with endometrial adenocarcinoma were randomly divided into four groups : mice treated with vehicle alone (control) , MPA (10mg/kg body weight) , TNP-470 (30mg/kg body weight) , or MPA and TNP-470 combination. Vehicle or the compounds were injected sc every two days for 8 weeks. Administration of MPA significantly inhibited the increase in tumor size, and the inhibition became evident 2 weeks after MPA treatment. On the other hand, the suppression of the increase in tumor size by TNP-470, an angiogenic inhibitor, was not significant. There was no difference in the degr … More ee of tumor reduction between the treatments of MPA alone and MPA and TNP-470 combination.We next examined the mechanism of tumor reduction by MPA treatment. After MPA treatment necrosis was evident in the tumor grafts. Vessel counts and immunohistochemical stainings for angiogenic growth factors, bFGF and TGF-alpha, in tumors were carried out. Neither MPA nor TNP-470 significantly reduced the number of vessels and the intensity of immunostainings for bFGF and TGF-alpha in tumors. In order to know whether MPA treatment induced apoptosis of tumor cells and reduced the tumor size, TUNEL stainings were performed in tumor grafts. There was no significant difference in the intensity of staining between the control and MPA-treated groups. Finally, the proliferative ability of tumor cells was examined by the method of PCNA staining. It was found that the number of PCNA-positive cells was remarkably decreased in MPA-treated tumors.In the present study with nude mouse model system, the mechanism of antitumor effect of MPA in endometrial adenocarcinoma was shown. However, antiproliferative effect of an angiogenic inhibitor on adenocarcinoma could not be found in this system. Less