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氯化镧通过细胞周期机制促进NIH 3T3小鼠胚胎成纤维细胞增殖

潘鑫, 李金霞, 董发勤, 邓建军, 袁兰, 王夔, 余四旺*   

  1. 1. 北京大学医学部 药学院 化学生物学系, 北京 100191
    2. 西南科技大学 环境与资源学院及固体废物处理与资源化教育部重点实验室, 四川 绵阳 621010
    3. 北京大学医学部 医药卫生分析中心, 北京 100191
  • 收稿日期:2012-11-04 修回日期:2012-12-25 出版日期:2013-01-20 发布日期:2013-01-20
  • 通讯作者: 余四旺*

Lanthanum chloride promotes proliferation of NIH 3T3 cells via cell cycle machinery

Xin Pan, Jinxia Li, Faqin Dong, Jianjun Deng, Lan Yuan, Kui Wang, Siwang Yu*   

  1. 1. Department of Chemical Biology, School of Pharmaceutical Sciences, Peking University Health Science Center, Beijing 100191, China
    2. Key Lab of Solid Waste Treatment and Resource, Ministry of Education/School of Environment and Resource, Southwest University of Science and Technology, Sichuan 621010, China
    3. Medical and Health Analysis Center, Peking University Health Science Center, Beijing 100191, China
  • Received:2012-11-04 Revised:2012-12-25 Online:2013-01-20 Published:2013-01-20
  • Contact: Siwang Yu*

摘要:

镧离子(La3+)对NIH 3T3小鼠胚胎成纤维细胞的增殖有重要影响, 但其机理尚需深入研究。在本研究中, 我们运用增殖分析、周期阻滞-释放和BrdU追踪等方法详细分析了La3+ 对NIH 3T3细胞增殖及细胞周期动力学的影响。结果显示, La3+ 处理12小时即有显著促增殖作用, 在48小时促增殖效应的EC50 为 2.4 μM。La3+ 促NIH 3T3细胞增殖的作用也在BrdU掺入实验中得到了验证。La3+ 推动更多细胞跨过G1/S周期检查点进入S期, 但不改变细胞周期的时间长度。免疫荧光染色发现, La3+ 处理增加了两个关键细胞周期调控因子cyclin D1和c-Myc的蛋白水平和细胞核定位。本研究显示La3+ 的促增殖作用与报道的可能引起肾源性系统性纤维化疾病的Gd3+ 非常相似, 并提供了镧系元素细胞生物学活性的新信息。

关键词: 镧离子, NIH 3T3 细胞, 增殖, 细胞周期, Cyclin D1, c-Myc

Abstract:

Lanthanum ions (La3+) have been reported to exert profound effects on the proliferation of NIH 3T3 mouse embryonic fibroblasts. In the present studies, the pro-proliferative effect of La3+ on NIH 3T3 cells was further characterized, and its impacts on the cell cycle kinetics were analyzed in detail by cell cycle arrest-and-release and pulse BrdU-labeling and chasing experiments. The results show that La3+ promoted the proliferation of NIH 3T3 cells after 12 h and the EC50 was 2.4 μM after 48 h. Such effect was also confirmed by enhanced BrdU incorporation. La3+ stimulated more cells to pass through the G1/S checkpoint into S phase, but did not change the length of cell cycle. Furthermore, La3+-treatment increased the protein levels and nuclear localization of cyclin D1 and c-Myc, two key regulators of G1/S checkpoint, as demonstrated by immunostaining. The pro-proliferative effects of La3+ share striking similarity with that of Gd3+, and provided new information regarding the cellular biological activities of lanthanides.

Key words: Lanthanum ions, NIH 3T3 cells, Proliferation, Cell cycle, Cyclin D1, c-Myc

中图分类号: 

Supporting:

Foundation items: National Natural Science Foundation (Grant No. 21001011) and Key Program of National Natural Science Foundation of China (Grant No. 41130746).
*Corresponding author. Tel.: 86-10-82801539