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JoVE Encyclopedia of Experiments
Cancer Research
确定癌细胞的最佳抑制性肿瘤治疗场频率:一种评估 TTFields 对癌细胞活力影响的无创体外方法
确定癌细胞的最佳抑制性肿瘤治疗场频率:一种评估 TTFields 对癌细胞活力影响的无创体外方法
Encyclopedia of Experiments
Cancer Research
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Encyclopedia of Experiments Cancer Research
Determining Optimal Inhibitory Tumor Treating Field Frequency for Cancer Cells: A Non-invasive In Vitro Method to Assess the Effect of TTFields on Cancer Cell Viability

确定癌细胞的最佳抑制性肿瘤治疗场频率:一种评估 TTFields 对癌细胞活力影响的无创体外方法

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05:54 min
July 8, 2025
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肿瘤治疗场 (TTFields) 使用交变电场来破坏癌细胞增殖。要在体外研究TTFields对癌细胞的影响,首先在底板上组装TTFields兼容培养皿。位于碟形壁上的一对电极有助于在内部传递电场。

在

组装好的盘子内放置玻璃盖玻片。将一滴癌细胞悬浮液种在盖玻片上。孵育以使细胞沉降并粘附在盖玻片表面。丢弃用过的介质。用新鲜的生长培养基补充它,以支持癌细胞的生长和扩增。

将

组件转移到冷藏环境中,以补偿电场应用期间的碟形加热。接下来,将组件连接到电源。将细胞置于适当的电场中所需的持续时间。

在

快速分裂的细胞内,施加的场导致带电分子(如微管蛋白二聚体和隔膜)沿其方向强行排列。这种机制会干扰关键的有丝分裂事件,如微管聚合和隔膜纤维定位。由此产生的有丝分裂停滞会触发细胞凋亡,导致肿瘤细胞死亡。

首先,将带盖的TTFields培养皿安装到底板上,并准备另外8个培养皿,用于培养对照细胞。在每个盘子的底部放置一个无菌的 2 毫米盖玻片。接下来,将 5 次 10 悬浮至第四个 U-87 MG 细胞在一毫升 DMEM 培养基中。

每个培养皿中接种的适当细胞数量取决于所用细胞系的特性。在实验前校准它以避免细胞过度生长至关重要。

将 200 微升细胞悬液移液到每个盖玻片上,使其表面形成一滴,并用盖子盖住培养皿。将所有培养皿在 37 摄氏度、5% 二氧化碳下孵育过夜,让细胞粘附。

连接

细胞后,使用 200 微升移液器从盖玻片中吸出培养基。然后,小心地将 2 毫升完全生长培养基移到每个培养皿上。用无菌移液器吸头轻轻敲击盖玻片边缘,以释放载玻片下方卡住的任何气泡。

然后,将细胞在 37 摄氏度、5% 二氧化碳下孵育,直到 TTFields 处理开始。要开始TTFields治疗,请从37摄氏度的培养箱中取出底板,并将其放入冷藏的二氧化碳培养箱中。

冷藏培养箱温度将决定电场强度。使用适当的强度很重要,这取决于细胞对 TTFields 的敏感性。

然后,将扁平电缆母连接器插入底板并打开 TTFields 发生器。打开 TTFields 体外应用系统专用软件。通过输入实验和实验者的姓名定义新研究后,调整每个培养皿的频率和目标温度。

单击 START 按钮在软件中启动 TTField 的处理,并检查所有盘子在显示器上是否显示为浅蓝色,以确认它们的正确连接。要重新建立连接,请轻轻按下盘子并缓慢来回旋转,直到盘子在屏幕上显示浅蓝色。

治疗 24 小时后,单击暂停在软件中停止实验。断开扁平电缆连接器与底板的连接,然后将底板放入层流柜中。

然后,从培养箱中取出装有培养皿和在标准条件下生长的对照细胞的底板。用新鲜的完全生长培养基替换所有培养皿中的培养基。然后,将对照细胞放入 37 摄氏度、5% 二氧化碳培养箱中,并将底板放回冷藏培养箱中。

将

底板重新连接到发电机。单击继续按钮继续治疗。治疗完成后,单击软件中的"结束实验"按钮完成实验。然后,保存从系统上传的数据。

关闭 TTFields 发生器后,断开扁平电缆与底板的连接,并将系统从培养箱中取出。向下按并逆时针转动陶瓷盘,将其从底板上拆下。

接下来,将经过 TTFields 处理和对照的盖玻片无菌转移到含有新鲜培养基的无菌培养皿中以进行进一步评估。

Key Terms and Definitions

  • Tumor Treating Fields (TTFields) - An approach using alternating electric fields to disrupt the growth of cancer cells.
  • Cancer cell viability - Assessing living, functional cells in a cancer population.
  • Microtubule polymerization - The process of building cellular structures vital for cancer cell division.
  • Apoptosis - The process of programmed cell death, heightened with TTFields.
  • OVCAR3 doubling time - Time it takes for OVCAR3 cancer cell population to double, influenced by TTFields.

Scientific Background

  • Introduce Tumor Treating Fields (TTFields) - It applies electric fields to interfere with cancer cell growth (e.g., TTF therapy).
  • Key Concepts - TTFields can disrupt cellular structures, hindering cancer cell propagation (e.g., microtubule polymerization).
  • Underlying Mechanisms - Electric field causes molecules to align and interferes mitotic events triggering cell death (e.g., apoptosis).
  • Connect to the Experiment - The investigation tests TTFields effectiveness in reducing OVCAR3 cell viability.

Questions that this video will help you answer

  • What are Tumor Treating Fields and how do they affect cancer cell viability?
  • What is the role of microtubule polymerization in TTFields?
  • How does apoptosis occur as a result of TTFields application?

Applications and Relevance

  • Practical Applications - TTFields can be employed as therapeutics for managing cancer (e.g., TTF therapy).
  • Industry Impact - Companies like Novocure, developing TTField-based therapies, impact the healthcare industry (e.g., Novocure).
  • Societal Importance - TTFields provide a non-invasive, novel approach to disrupt tumor growth (e.g., TTFields).
  • Link to Scientific Advancements - TTFields represent a promising avenue for future cancer research.

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