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Cell aggregation-induced FGF8 elevation is essential for P19 cell neural differentiation.
Chen Wang1, Caihong Xia, Wei Bian
1Key Laboratory of Stem Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences and Graduate School of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200031, China.
Molecular Biology of the Cell
|April 28, 2006
Summary
Fibroblast growth factor 8 (FGF8) promotes neural differentiation in P19 cells during retinoic acid (RA) treatment. FGF8 signaling acts independently of bone morphogenetic protein (BMP) pathways in this process.
Area of Science:
- Developmental biology
- Stem cell biology
- Molecular signaling
Background:
- Fibroblast growth factor 8 (FGF8) is crucial for development.
- P19 cell differentiation into neuroectoderm is induced by retinoic acid (RA) and depends on cell aggregation.
- The role of FGF8 in RA-induced P19 cell differentiation requires further elucidation.
Purpose of the Study:
- To investigate the role of FGF8 in retinoic acid-induced neural differentiation of mouse embryonic carcinoma P19 cells.
- To determine if FGF8 signaling is involved in the cell aggregation-dependent process.
- To clarify the relationship between FGF8 signaling and bone morphogenetic protein (BMP) pathways during neural differentiation.
Main Methods:
- Analyzing FGF8 expression during P19 cell aggregation.
- Overexpressing FGF8 in P19 cells.
- Inhibiting FGF8 expression using RNA interference.
- Blocking FGF signaling with SU5402.
- Overexpressing Smad6 to block BMP signaling.
Main Results:
- FGF8 expression is transiently upregulated during P19 cell aggregation, linked to pluripotent stem cell status.
- Overexpression of FGF8 enhances RA-induced neural differentiation in monolayer P19 cells.
- FGF8 inhibition or FGF receptor blockade attenuates neural differentiation.
- FGF signaling promotes neural differentiation independently of BMP pathway inhibition.
Conclusions:
- FGF8 plays a key role in promoting RA-induced neural differentiation of P19 cells.
- FGF8 signaling is an important component of the aggregation-dependent differentiation process.
- FGF signaling contributes to neural differentiation through a mechanism independent of BMP inhibition.