HER2-Targeted Tyrosine Kinase Inhibitors Cause Therapy-Induced-Senescence in Breast Cancer Cells

拉帕蒂尼 阿法替尼 衰老 来那替尼 癌症研究 酪氨酸激酶 酪氨酸激酶抑制剂 医学 曲妥珠单抗 药理学 癌症 乳腺癌 内科学 表皮生长因子受体 受体 埃罗替尼
作者
Martina S.J. McDermott,Neil T. Conlon,Brigid C. Browne,Adam Szabo,Naoise C. Synnott,Neil A. O’Brien,Michael J. Duffy,John Crown,Norma O’Donovan
出处
期刊:Cancers [Multidisciplinary Digital Publishing Institute]
卷期号:11 (2): 197-197 被引量:33
标识
DOI:10.3390/cancers11020197
摘要

Prolonged treatment of HER2 positive breast cancer cells with tyrosine kinase inhibitors (TKIs) leads to the emergence of acquired resistance. However, the effects of continuous TKI exposure on cell fate, and the steps leading to the acquisition of a resistant phenotype are poorly understood. To explore this, we exposed five HER2 positive cells lines to HER2 targeted therapies for periods of up to 4 weeks and examined senescence associated β-galactosidase (SA-β-gal) activity together with additional markers of senescence. We found that lapatinib treatment resulted in phenotypic alterations consistent with a senescent phenotype and strong SA-β-gal activity in HER2-positive cell lines. Lapatinib-induced senescence was associated with elevated levels of p15 and p27 but was not dependent on the expression of p16 or p21. Restoring wild type p53 activity either by transfection or by treatment with APR-246, a molecule which reactivates mutant p53, blocked lapatinib-induced senescence and caused increased cell death. In contrast to lapatinib, SA-β-gal activity was not induced by exposing the cells to trastuzumab as a single agent but co-administration of lapatinib and trastuzumab induced senescence, as did treatment of the cells with the irreversible HER2 TKIs neratinib and afatinib. Neratinib- and afatinib-induced senescence was not reversed by removing the drug whereas lapatinib-induced senescence was reversible. In summary, therapy-induced senescence represents a novel mechanism of action of HER2 targeting agents and may be a potential pathway for the emergence of resistance.

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