Downregulation of Wip-1 phosphatase expression in MCF-7 breast cancer cells enhances doxorubicin-induced apoptosis through p53-mediated transcriptional activation of Bax

As chemotherapeutic backbone for breast cancer therapy, doxorubicin showed various side effects and induced resistancy of breast cancer cells. Development of targeted therapy on breast cancer focused on combinatorial therapy of doxorubicin and molecular targeted agents. PGV-0 and PGV-1, a curcumin analogue showed potency as co-chemotherapeutic agent with doxorubicin. Our previous study of PGV-0 and PGV-1 showed cytotoxic activity in T47D cells. Therefore, the aim of this research is to examine the synergistic effect of PGV-0, PGV-1 on the cytotoxic activity of doxorubicin through cell cycle modulation and apoptotic induction on MCF-7 breast cancer cell lines. The cytotoxic assay of PGV-0, PGV-1, doxorubicin, and their combination were carried out by using MTT assay. Cell cycle distribution and apoptosis were determined by flowcytometer FACS-Calibur and the flowcytometry data was analyzed using Cell Quest program. Single treatment of PGV-0, PGV-1 and doxorubicin showed cytotoxic effect on MCF-7 with cell viability IC50 value 50 µM, 6 µM and 350 nM respectively. Single treatment of Doxorubicin 175 nM induced G2/M arrest. Single treatment of PGV-0 5 µM induced G2/M arrest while in higher dose 12.5 µM, PGV-0 induced apoptosis. Combination of doxorubicin 175 nM and PGV-0 5 µM induced apoptosis. Combination of doxorubicin 175 nM and PGV-0 12.5 µM also increased apoptosis induction. Single treatment of PGV-1 0.6 µM induced G1 arrest while in higher dose 1.5 µM, PGV-1 induced apoptosis. Combination of doxorubicin 175 nM and PGV-1 0.6 µM induced apoptosis. Combination of doxorubicin 175 nM and PGV-0 1.5 µM also increased apoptosis induction. PGV-0 and PGV-1 are potential to be delevoped as co-chemotherapeutic agent for breast cancer by inducing apoptosis and cell cycle modulation, but the molecular mechanism need to be explored detail. Key words: PGV-0, PGV-1, doxorubicin, co-chemotherapy, breast cancer, cell cycle arrest, apoptosis

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A polysaccharide from Huaier induced apoptosis in MCF-7 breast cancer cells via down-regulation of MTDH protein

Carbohydrate Polymers ◽

10.1016/j.carbpol.2016.06.046 ◽

2016 ◽

Vol 151 ◽

pp. 1027-1033 ◽

Cited By ~ 23

Author(s):

Zhiyong Luo ◽

Xiaopeng Hu ◽

Hua Xiong ◽

Hong Qiu ◽

Xianglin Yuan ◽

...

Keyword(s):

Breast Cancer ◽

Cancer Cells ◽

Breast Cancer Cells ◽

Down Regulation ◽

Induced Apoptosis ◽

Mcf 7

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Effet radiosensibilisateur de l'acide linoléique conjugué chez les cellules cancéreuses du sein MCF-7 et MDA-MB-231

Canadian Journal of Physiology and Pharmacology ◽

10.1139/y04-003 ◽

2004 ◽

Vol 82 (2) ◽

pp. 94-102 ◽

Cited By ~ 1

Author(s):

Geneviève Drouin ◽

Annie Douillette ◽

Pierre Lacasse ◽

Benoit Paquette

Keyword(s):

Breast Cancer ◽

Linoleic Acid ◽

Cancer Cells ◽

Conjugated Linoleic Acid ◽

Breast Cancer Cells ◽

Fold Increase ◽

Breast Cancer Cell Lines ◽

Apoptotic Pathways ◽

Induced Apoptosis ◽

Mcf 7

Apoptotic pathways in breast cancer cells are frequently altered, reducing the efficiency of radiotherapy. Conjugated linoleic acid (CLA), known to trigger apoptosis, was tested as radiosensitizer in breast cancer cells MCF-7 and MDA-MB-231. The CLA-mix, made up of the isomers CLA-9cis 11trans and CLA-10trans 12cis, was compared to three purified isomers, i.e., the CLA-9cis 11cis, CLA-9cis 11trans, and CLA-10trans 12cis. Using the apoptotic marker YO-PRO®-1, the CLA-9cis 11cis at 50 µmol/L turned out to be the best apoptotic inducer leading to a 10-fold increase in MCF-7 cells and a 2,5-fold increase in MDA-MB-231 cells, comparatively to the CLA-mix. Contrary to previous studies on colorectal and prostate cancer cells, CLA-10trans 12cis does not lead to an apoptotic response on breast cancer cell lines MCF-7 and MDA-MB-231. Our results also suggest that the main components of the CLA-mix (CLA-9cis 11trans and CLA-10trans 12cis) are not involved in the induction of apoptosis in the breast cancer cells studied. A dose of 5 Gy did not induce apoptosis in MCF-7 and MDA-MB-231 cells. The addition of CLA-9cis 11cis or CLA-mix has allowed us to observe a radiation-induced apoptosis, with the CLA-9cis 11cis being about 8-fold better than the CLA-mix. CLA-9cis 11cis turned out to be the best radiosensitizer, although the isomers CLA-9cis 11trans and CLA-10trans 12cis have also reduced the cell survival following irradiation, but using a mechanism not related to apoptosis. In conclusion, the radiosensitizing property of CLA-9cis 11cis supports its potential as an agent to improve radiotherapy against breast carcinoma.Key words: breast cancer, conjugated linoleic acid (CLA), radiotherapy, apoptosis.

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A Novel Human Phosphatidylethanolamine-binding Protein Resists Tumor Necrosis Factor α-induced Apoptosis by Inhibiting Mitogen-activated Protein Kinase Pathway Activation and Phosphatidylethanolamine Externalization

Journal of Biological Chemistry ◽

10.1074/jbc.m405147200 ◽

2004 ◽

Vol 279 (44) ◽

pp. 45855-45864 ◽

Cited By ~ 75

Author(s):

Xiaojian Wang ◽

Nan Li ◽

Bin Liu ◽

Hongying Sun ◽

Taoyong Chen ◽

...

Keyword(s):

Breast Cancer ◽

Tumor Necrosis Factor ◽

Cancer Cells ◽

Tumor Cells ◽

Breast Cancer Cells ◽

Tumor Necrosis ◽

Induced Apoptosis ◽

Phosphatidylethanolamine Binding Protein ◽

Necrosis Factor ◽

Mcf 7

The phosphatidylethanolamine (PE)-binding proteins (PEBPs) are an evolutionarily conserved family of proteins with pivotal biological functions. Here we describe the cloning and functional characterization of a novel family member, human phosphatidylethanolamine-binding protein 4 (hPEBP4). hPEBP4 is expressed in most human tissues and highly expressed in tumor cells. Its expression in tumor cells is further enhanced upon tumor necrosis factor (TNF) α treatment, whereas hPEBP4 normally co-localizes with lysosomes, TNFα stimulation triggers its transfer to the cell membrane, where it binds to Raf-1 and MEK1. L929 cells overexpressing hPEBP4 are resistant to both TNFα-induced ERK1/2, MEK1, and JNK activation and TNFα-mediated apoptosis. Co-precipitation andin vitroprotein binding assay demonstrated that hPEBP4 interacts with Raf-1 and MEK1. A truncated form of hPEBP4, lacking the PE-binding domain, maintains lysosomal co-localization but has no effect on cellular responses to TNFα. Given that MCF-7 breast cancer cells expressed hPEBP4 at a high level, small interfering RNA was used to silence the expression of hPEBP4. We demonstrated that down-regulation of hPEBP4 expression sensitizes MCF-7 breast cancer cells to TNFα-induced apoptosis. hPEBP4 appears to promote cellular resistance to TNF-induced apoptosis by inhibiting activation of the Raf-1/MEK/ERK pathway, JNK, and PE externalization, and the conserved region of PE-binding domain appears to play a vital role in this biological activity of hPEBP4.

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Bag-1 silencing enhanced chemotherapeutic drug-induced apoptosis in MCF-7 breast cancer cells affecting PI3K/Akt/mTOR and MAPK signaling pathways

Molecular Biology Reports ◽

10.1007/s11033-018-4540-x ◽

2019 ◽

Vol 46 (1) ◽

pp. 847-860 ◽

Cited By ~ 6

Author(s):

Pelin Ozfiliz Kilbas ◽

Izzet Mehmet Akcay ◽

Gizem Dinler Doganay ◽

Elif Damla Arisan

Keyword(s):

Breast Cancer ◽

Cancer Cells ◽

Signaling Pathways ◽

Breast Cancer Cells ◽

Mapk Signaling ◽

Chemotherapeutic Drug ◽

Drug Induced ◽

Induced Apoptosis ◽

Mapk Signaling Pathways ◽

Mcf 7

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Silibinin Enhances Ultraviolet B-Induced Apoptosis in MCF-7 Human Breast Cancer Cells

Journal of Breast Cancer ◽

10.4048/jbc.2011.14.1.8 ◽

2011 ◽

Vol 14 (1) ◽

pp. 8 ◽

Cited By ~ 15

Author(s):

Eun-Mi Noh ◽

Mi Suk Yi ◽

Hyun Jo Youn ◽

Byoung Kil Lee ◽

Young-Rae Lee ◽

...

Keyword(s):

Breast Cancer ◽

Cancer Cells ◽

Human Breast Cancer ◽

Breast Cancer Cells ◽

Ultraviolet B ◽

Human Breast Cancer Cells ◽

Human Breast ◽

Induced Apoptosis ◽

Mcf 7

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Induction of multidrug resistance associated protein 2 in tamoxifen-resistant breast cancer cells

Endocrine Related Cancer ◽

10.1677/erc-06-0016 ◽

2007 ◽

Vol 14 (2) ◽

pp. 293-303 ◽

Cited By ~ 50

Author(s):

Hoo Kyun Choi ◽

Jin Won Yang ◽

Sang Hee Roh ◽

Chang Yeob Han ◽

Keon Wook Kang

Keyword(s):

Breast Cancer ◽

Multidrug Resistance ◽

Cancer Cells ◽

Transcriptional Activation ◽

Breast Cancer Cells ◽

Pregnane X Receptor ◽

Pi3 Kinase ◽

Gene Promoters ◽

Breast Cancer Patients ◽

Mcf 7

Acquired resistance to tamoxifen (TAM) is a serious therapeutic problem in breast cancer patients. The transition from chemotherapy-responsive breast cancer cells to chemotherapy-resistant cancer cells is mainly accompanied by the increased expression of multidrug resistance-associated proteins (MRPs). In this study, it was found that TAM-resistant MCF-7 (TAMR-MCF-7) cells expressed higher levels of MRP2 than control MCF-7 cells. Molecular analyses using MRP2 gene promoters supported the involvement of the pregnane X receptor (PXR) in MRP2 overexpression in TAMR-MCF-7 cells. Although CCAAT/enhancer-binding protein β was overexpressed continuously in TAMR-MCF-7 cells, this might not be responsible for the transcriptional activation of the MRP2 gene. In addition, the basal activities of phosphatidylinositol 3-kinase (PI3-kinase) were higher in the TAMR-MCF-7 cells than in the control cells. The inhibition of PI3-kinase significantly reduced both the PXR activity and MRP2 expression in TAMR-MCF-7 cells. Overall, MRP2 induction plays a role in the additional acquisition of chemotherapy resistance in TAM-resistant breast cancer.

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