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Stimulation of the mitogen-activated protein kinase pathway antagonizes TRAIL-induced apoptosis downstream of BID cleavage in human breast cancer MCF-7 cells.
- Source :
-
Oncogene [Oncogene] 2002 Jun 20; Vol. 21 (27), pp. 4323-7. - Publication Year :
- 2002
-
Abstract
- We studied the role of the mitogen-activated protein kinase (MAPK) pathway in the regulation of tumor necrosis factor-related apoptosis-inducing ligand (TRAIL)-mediated apoptosis in breast tumor MCF-7 cells. We found that addition of a protein kinase C (PKC) activator to MCF-7 cultures prevented TRAIL-induced apoptosis, by inhibiting a step downstream of both caspase-8 activation and BID cleavage. TRAIL-induced translocation of Bax from cytosol to mitochondria, release of cytochrome c from mitochondria and activation of caspase-9 were all inhibited by PKC activation. PKC-mediated prevention of mitochondrial apoptotic events and apoptosis was found to be dependent on the MAPK pathway. Since TRAIL is a ligand of potential use in antineoplastic clinical trials, our findings may provide relevant information in cancer therapy.
- Subjects :
- Apoptosis Regulatory Proteins
BH3 Interacting Domain Death Agonist Protein
Breast Neoplasms metabolism
Carcinoma, Ductal, Breast metabolism
Caspase 8
Caspase 9
Caspases metabolism
Cytochrome c Group metabolism
Cytosol metabolism
Enzyme Activation drug effects
Female
Humans
MAP Kinase Signaling System drug effects
Mitochondria metabolism
Neoplasm Proteins antagonists & inhibitors
Protein Kinase C metabolism
Protein Transport
Proto-Oncogene Proteins metabolism
TNF-Related Apoptosis-Inducing Ligand
Tumor Cells, Cultured drug effects
Tumor Cells, Cultured metabolism
bcl-2-Associated X Protein
Apoptosis drug effects
Breast Neoplasms pathology
Carcinoma, Ductal, Breast pathology
Carrier Proteins metabolism
MAP Kinase Signaling System physiology
Membrane Glycoproteins antagonists & inhibitors
Neoplasm Proteins physiology
Proto-Oncogene Proteins c-bcl-2
Tumor Necrosis Factor-alpha antagonists & inhibitors
Subjects
Details
- Language :
- English
- ISSN :
- 0950-9232
- Volume :
- 21
- Issue :
- 27
- Database :
- MEDLINE
- Journal :
- Oncogene
- Publication Type :
- Academic Journal
- Accession number :
- 12082620
- Full Text :
- https://doi.org/10.1038/sj.onc.1205523