Neurotrophic receptor tyrosine kinase B induces c-fos-associated cell survival.
Int J Mol Med
; 24(6): 807-11, 2009 Dec.
Article
in En
| MEDLINE
| ID: mdl-19885622
ABSTRACT
The neurotrophic receptor tyrosine kinase B (TrkB) is a cell surface receptor for brain-derived neurotrophic factor (BDNF) with kinase activity. This protein is expressed in various tumors and thought to participate in various cellular processes. In this study, we established 293T cells stably expressing human TrkB to elucidate its intracellular functions. Using this cell system, we examined the biological roles of TrkB and its downstream target molecules. The TrkB expressing cells showed an increased survival rate through increased c-fos mRNA expression by BDNF, which were completely suppressed by TrkB inhibitor. Moreover, the combination of inhibitors of mitogen-activated protein kinase (MEK) and phosphatidylinositol 3-kinase (PI3K) partially reduced both the cell survival rate and c-fos mRNA expression, whereas monotreatment of these reagents could not affect cell survival nor c-fos mRNA expression. These results suggested that TrkB could play a role in c-fos-associated cell survival through both MEK and PI3K pathway. It is conceivable that activation of TrkB has a significant impact on tumorigenesis and metastasis.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Cell Survival
/
Proto-Oncogene Proteins c-fos
/
Brain-Derived Neurotrophic Factor
/
Receptor, trkB
Type of study:
Risk_factors_studies
Limits:
Humans
Language:
En
Journal:
Int J Mol Med
Journal subject:
BIOLOGIA MOLECULAR
/
GENETICA MEDICA
Year:
2009
Document type:
Article
Affiliation country:
Japan