实用医学杂志 ›› 2025, Vol. 41 ›› Issue (12): 1808-1815.doi: 10.3969/j.issn.1006-5725.2025.12.006

• 基础研究 • 上一篇    下一篇

肿瘤类器官培养体系下维迪西妥单抗对不同人类表皮生长因子受体2表达水平乳腺癌细胞的抑制作用

江璐1,吕伟朋2,陈思静1,房艳华1,梁珊珊1()   

  1. 1.辽宁省乳腺及消化肿瘤分子标志物高通量筛选及靶向药物转化重点实验室,大连大学附属中山医院肿瘤中心 (辽宁 大连 116001 )
    2.大连大学附属中山医院病理科 (辽宁 大连 116001 )
  • 收稿日期:2024-11-29 出版日期:2025-06-25 发布日期:2025-07-02
  • 通讯作者: 梁珊珊 E-mail:liangshanshan@dlu.edu.cn
  • 基金资助:
    国家自然科学基金项目(82172822);辽宁省国际科技合作项目(2024JH2/101900006);兴辽英才医学名家项目(YXMJ-JC-10)

Inhibitory effect of disitamab vedotin on breast cancer cells with different HER⁃2 expression levels in tumor organoid culture system

Lu JIANG1,Weipeng LYU2,Sijing CHEN1,Yanhua FANG1,Shanshan LIANG1()   

  1. Liaoning Provincial Key Laboratory of High?throughput Screening and Targeted Drug Transformation of Molecular Markers of Breast and Digestive Tumor,Cancer Center,Zhongshan Hospital Affiliated to Dalian University,Dalian 116001,Liaoning,China
  • Received:2024-11-29 Online:2025-06-25 Published:2025-07-02
  • Contact: Shanshan LIANG E-mail:liangshanshan@dlu.edu.cn

摘要:

目的 研究肿瘤类器官培养体系下,ADC药物维迪西妥单抗(RC-48)对不同HER-2表达水平乳腺癌细胞的抑制作用。 方法 在肿瘤类器官培养体系下,对乳腺癌HER-2低表达细胞系MCF-7(Luminal A型)、高表达细胞系BT-474(HER-2型)以及二者不同混合比例组进行培养;对形成的类器官进行组织学表征,并通过免疫组化和免疫荧光技术检测HER-2在MCF-7与BT-474类器官中的表达水平及空间分布;使用维迪西妥单抗(RC-48)、迪西妥单抗(Disitamab)和甲基澳瑞他汀E(MMAE)分别处理MCF-7和BT-474类器官以及对不同比例MCF-7和BT-474混合培养及患者来源的乳腺癌类器官进行RC-48的药敏试验,通过3D-Glo法评估药物敏感性。 结果 在肿瘤类器官培养体系下,免疫组化及免疫荧光检测显示,HER-2主要定位于细胞膜,BT-474类器官中HER-2表达为强阳性,MCF-7类器官则呈现低表达状态;相较于MCF-7类器官,RC48-ADC对BT-474类器官表现出更显著的抑制效应(IC50:109.7 μg/mL vs. 2.792 μg/mL);共培养模型进一步验证了RC-48的旁观者效应,HER-2阳性细胞与阴性细胞的比例显著影响药物杀伤效果。此外,RC-48处理后,不同HER-2表达水平的乳腺癌类器官中HER-2的表达量均呈下降趋势。 结论 肿瘤类器官模型能有效反映靶向药物的敏感性和旁观者效应。RC-48在类器官模型中对HER-2高表达乳腺癌细胞具有显著抑制作用,并通过旁观者效应增强杀伤效应,同时可下调HER-2表达,显示出针对HER-2相关乳腺癌的治疗潜力。

关键词: 肿瘤类器官, 乳腺癌, 人类表皮生长因子受体2, 抗体偶联药物, 旁观者效应, 抑制作用

Abstract:

Objective The present study was designed to explore the inhibitory effects of the ADC drug Disitamab Vedotin (RC-48) on breast cancer cells with different HER-2 expression levels by utilizing a tumor organoid culture system. Methods Within the framework of the tumor organoid culture system, the breast cancer cell lines MCF-7 (characterized by low HER-2 expression, Luminal A subtype) and BT-474 (exhibiting high HER-2 expression, HER-2 positive subtype) were cultured independently and in various mixed ratios. The histological characteristics, as well as the expression levels and distribution of HER-2 in MCF-7 and BT-474 organoids, were analyzed via immunohistochemistry and immunofluorescence techniques. MCF-7 and BT-474 organoids were separately treated with Vedotin (RC-48), Disitamab, and Monomethyl auristatin E (MMAE). Additionally, a drug sensitivity test of Disitamab Vedotin (RC-48) was carried out on mixed MCF-7 and BT-474 cell ratios and on patient-derived breast cancer organoids, with the assessment conducted using the 3D-Glo method. Results In the tumor organoid culture system, immunohistochemistry and immunofluorescence analyses demonstrated that HER-2 was predominantly localized in the cell membrane. Specifically, BT-474 organoids exhibited robust HER-2 expression, while MCF-7 organoids displayed relatively low expression levels. When compared with MCF-7 organoids, RC48-ADC exerted a more pronounced inhibitory effect on BT-474 organoids, with IC50 values of 109.7 μg/mL and 2.792 μg/mL, respectively. The co-culture model further confirmed the bystander effect of RC-48, revealing that the ratio of HER-2-positive to HER-2-negative cells significantly influenced drug efficacy. Additionally, treatment with RC-48 led to a reduction in HER-2 expression in breast cancer organoids with diverse HER-2 expression levels. Conclusions The tumor organoid model can accurately mirror drug sensitivity and bystander effects. Within this model, RC-48 effectively inhibited HER-2 highly-expressing breast cancer cells, augmented the killing effect through the bystander mechanism, and downregulated HER-2 expression, thereby suggesting its potential for targeting HER2-associated breast cancer.

Key words: tumor organoids, breast cancer, HER-2, ADC, bystander effect, inhibition

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