17β-Estradiol Inhibits Tumor Necrosis Factor-α-Induced Nuclear Factor-κB Activation by Increasing Nuclear Factor-κB p105 Level in MCF-7 Breast Cancer Cells

2000 ◽  
Vol 279 (1) ◽  
pp. 47-52 ◽  
Author(s):  
Su-Ming Hsu ◽  
Yen-Chou Chen ◽  
Ming-Chung Jiang
Keyword(s):  
Breast Cancer ◽  
Breast Cancer Cells ◽  
Tumor Necrosis ◽  
Tumor Necrosis Factor Α ◽  
Nuclear Factor Κb ◽  
Nuclear Factor ◽  
17Β Estradiol ◽  
Factor Α ◽  
Necrosis Factor ◽  
Mcf 7

scholarly journals Estradiol Abrogates Apoptosis in Breast Cancer Cells through Inactivation of BAD: Ras-dependent Nongenomic Pathways Requiring Signaling through ERK and Akt

2004 ◽  
Vol 15 (7) ◽  
pp. 3266-3284 ◽  
Author(s):  
Romaine Ingrid Fernando ◽  
Jay Wimalasena
Keyword(s):  
Breast Cancer ◽  
Tumor Necrosis Factor ◽  
Cancer Cells ◽  
Breast Cancer Cells ◽  
Tumor Necrosis ◽  
Tumor Necrosis Factor Α ◽  
Dominant Negative ◽  
Induced Apoptosis ◽  
Factor Α ◽  
Necrosis Factor

Estrogens such as 17-β estradiol (E2) play a critical role in sporadic breast cancer progression and decrease apoptosis in breast cancer cells. Our studies using estrogen receptor-positive MCF7 cells show that E2 abrogates apoptosis possibly through phosphorylation/inactivation of the proapoptotic protein BAD, which was rapidly phosphorylated at S112 and S136. Inhibition of BAD protein expression with specific antisense oligonucleotides reduced the effectiveness of tumor necrosis factor-α, H2O2, and serum starvation in causing apoptosis. Furthermore, the ability of E2 to prevent tumor necrosis factor-α-induced apoptosis was blocked by overexpression of the BAD S112A/S136A mutant but not the wild-type BAD. BAD S112A/S136A, which lacks phosphorylation sites for p90RSK1 and Akt, was not phosphorylated in response to E2 in vitro. E2 treatment rapidly activated phosphatidylinositol 3-kinase (PI-3K)/Akt and p90RSK1 to an extent similar to insulin-like growth factor-1 treatment. In agreement with p90RSK1 activation, E2 also rapidly activated extracellular signal-regulated kinase, and this activity was down-regulated by chemical and biological inhibition of PI-3K suggestive of cross talk between signaling pathways responding to E2. Dominant negative Ras blocked E2-induced BAD phosphorylation and the Raf-activator RasV12T35S induced BAD phosphorylation as well as enhanced E2-induced phosphorylation at S112. Chemical inhibition of PI-3K and mitogen-activated protein kinase kinase 1 inhibited E2-induced BAD phosphorylation at S112 and S136 and expression of dominant negative Ras-induced apoptosis in proliferating cells. Together, these data demonstrate a new nongenomic mechanism by which E2 prevents apoptosis.

Mutant p53 Enhances Nuclear Factor κB Activation by Tumor Necrosis Factor α in Cancer Cells

2007 ◽  
Vol 67 (6) ◽  
pp. 2396-2401 ◽  
Author(s):  
Lilach Weisz ◽  
Alexander Damalas ◽  
Michalis Liontos ◽  
Panagiotis Karakaidos ◽  
Giulia Fontemaggi ◽  
...  
Keyword(s):  
Tumor Necrosis Factor ◽  
Cancer Cells ◽  
Tumor Necrosis ◽  
Tumor Necrosis Factor Α ◽  
Nuclear Factor Κb ◽  
Mutant P53 ◽  
Nuclear Factor ◽  
Factor Α ◽  
Necrosis Factor

scholarly journals Activation of Transcriptionally Active Nuclear Factor-κB by Tumor Necrosis Factor-α and Its Inhibition by Antioxidants in Rat Thyroid FRTL-5 Cells1

Endocrinology ◽  
1998 ◽  
Vol 139 (4) ◽  
pp. 1715-1722 ◽  
Author(s):  
Toyone Kikumori ◽  
Fukushi Kambe ◽  
Takashi Nagaya ◽  
Tsuneo Imai ◽  
Hiroomi Funahashi ◽  
...  
Keyword(s):  
Tumor Necrosis Factor ◽  
Tumor Necrosis ◽  
Tumor Necrosis Factor Α ◽  
Nuclear Factor Κb ◽  
Nuclear Factor ◽  
Rat Thyroid ◽  
Factor Α ◽  
Necrosis Factor
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