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  • Title: 3D Culture Represents Apoptosis Induced by Trastuzumab Better than 2D Monolayer Culture.
    Author: Tatara T, Mukohara T, Tanaka R, Shimono Y, Funakoshi Y, Imamura Y, Toyoda M, Kiyota N, Hirai M, Kakeji Y, Minami H.
    Journal: Anticancer Res; 2018 May; 38(5):2831-2839. PubMed ID: 29715106.
    Abstract:
    BACKGROUND: Our hypothesis was that three-dimensional (3D) culture better represents differential in vivo responses to trastuzumab between PIK3CA-wild-type (wt) and mutant (mt) cell lines than does two-dimensional (2D) culture. MATERIALS AND METHODS: Apoptosis and cell signaling proteins were evaluated in response to trastuzumab with and without BKM120, a pan-phosphatidylinositol 3-kinase (PI3K) inhibitor, using western blot analysis of four breast cancer cell lines with human epidermal growth factor receptor 2 (HER2) amplification. RESULTS: Increased expression of cleaved poly (ADP-ribose) polymerase (PARP) was observed only in 3D-cultured PIK3CA-wt lines in response to trastuzumab, but not in 2D-cultured PIK3CA-wt or PIK3CA-mt lines. Decrease in the ratio of phosphorylated (p-)AKT to AKT in response to trastuzumab was more profound in PIK3CA-wt cells than in PIK3CA-mt cells in 3D culture, while the difference between PIK3CA genotypes was less apparent in 2D culture. Treatment with BKM120 and trastuzumab resulted in a stronger increase in cleaved PARP than either treatment alone. CONCLUSION: 3D Culture appears to better represent trastuzumab-induced apoptosis and resistance to trastuzumab associated with PIK3CA mutation.
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