التفاصيل البيبلوغرافية
| العنوان: |
PI3K inhibitor GDC-0941 enhances apoptotic effects of BH-3 mimetic ABT-737 in AML cells in the hypoxic bone marrow microenvironment. |
| المؤلفون: |
Jin, Linhua, Tabe, Yoko, Kojima, Kensuke, Shikami, Masato, Benito, Juliana, Ruvolo, Vivian, Wang, Rui-Yu, McQueen, Teresa, Ciurea, Stefan O., Miida, Takashi, Andreeff, Michael, Konopleva, Marina |
| المصدر: |
Journal of Molecular Medicine; Dec2013, Vol. 91 Issue 12, p1383-1397, 15p |
| مصطلحات موضوعية: |
PROTEIN kinase inhibitors, RAPAMYCIN, APOPTOSIS, ACUTE myeloid leukemia, HYPEROXIA, BONE marrow, MESENCHYMAL stem cells |
| مستخلص: |
Both phosphatidylinositide 3-kinase (PI3K)/Akt/mammalian target of rapamycin signaling and antiapoptotic Bcl-2 family members are critical for survival of acute myeloid leukemia (AML) cells. Here, we demonstrate the antileukemic effects of simultaneous inhibition of PI3K by the selective class I PI3K inhibitor GDC-0941 and of Bcl-2 family members by the BH3 mimetic ABT-737 in the context of the bone marrow microenvironment, where hypoxia and interactions with bone marrow stromal cells promote AML cell survival and chemoresistance. The combination of GDC-0941 and ABT-737 profoundly downregulated antiapoptotic Mcl-1 expression levels, activated BAX, and induced mitochondrial apoptosis in AML cells co-cultured with bone marrow stromal cells under hypoxic conditions. Hypoxia caused degradation of Mcl-1 and rendered Mcl-1-overexpressing OCI-AML3 cells sensitive to ABT-737. Our findings suggest that pharmacologic PI3K inhibition by GDC-0941 enhances ABT-737-induced leukemia cell death even under the protective conditions afforded by the bone marrow microenvironment. Key message: Combined blockade of PI3K and Bcl-2 pathways down-regulates anti-apoptotic Mcl-1 expression PI3K and Bcl-2 induced Mcl-1 down-regulation activates BAX PI3K and Bcl-2 blockage induces apoptosis in AML under hypoxic BM microenvironment [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
