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Updated: Mar 21, 2026
Differentiation of the SH-SY5Y Human Neuroblastoma Cell Line
Published on: February 17, 2016
Distinct effect of CacyBP/SIP on the ERK1/2-CREB-BDNF pathway in undifferentiated and differentiated neuroblastoma
Sara Rosińska1, Wiesława Leśniak1, Anna Filipek1
1Nencki Institute of Experimental Biology, 3 Pasteur Street, 02-093, Warsaw, Poland.
Abstract:
CacyBP/SIP, a protein expressed to high extent in the brain, has been shown to act as ERK1/2 phosphatase in vitro and in cultured cells. It has been demonstrated recently that CacyBP/SIP can modulate the activity of some transcription factors in neurons and glioma cells. In the present work we have examined the effect of CacyBP/SIP overexpression and silencing on the phosphorylation/activity of ERK1/2 (pERK1/2) and CREB (pCREB) and on the level of BDNF mRNA in differentiated and undifferentiated neuroblastoma NB2a cells. We have shown that in undifferentiated cells the amount of pERK1/2 decreased upon CacyBP/SIP overexpression. Further studies have shown that the activity of CREB and the level of BDNF mRNA, downstream effectors of the ERK1/2 signaling pathway, also depended on the CacyBP/SIP level and strictly matched the level of pERK1/2. Interestingly, in differentiated NB2a cells, overexpression of CacyBP/SIP appeared to have a distinct effect on the pERK1/2 level from that observed in undifferentiated cells. Subsequent studies have revealed that distinct function of CacyBP/SIP in undifferentiated and differentiated NB2a cells might be due to changes in its posttranslational modifications and protein ligands. Altogether, our studies suggest that CacyBP/SIP is involved in the ERK1/2-CREB-BDNF pathway and that it might regulate this pathway depending on the stage of NB2a cell differentiation.
Insights
CacyBP/SIP protein regulates the ERK1/2-CREB-BDNF pathway in neuroblastoma cells. Its effect varies with cell differentiation, impacting signaling pathways crucial for neuronal function.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- CacyBP/SIP is a brain-expressed protein known to function as an ERK1/2 phosphatase.
- CacyBP/SIP modulates transcription factor activity in neuronal and glioma cells.
- The ERK1/2 signaling pathway influences neuronal function and gene expression.
Purpose of the Study:
- To investigate the role of CacyBP/SIP in the ERK1/2-CREB-BDNF pathway in neuroblastoma NB2a cells.
- To determine how CacyBP/SIP affects the phosphorylation of ERK1/2 and CREB.
- To analyze the impact of CacyBP/SIP on BDNF mRNA levels in differentiated and undifferentiated cells.
Main Methods:
- Overexpression and silencing of CacyBP/SIP in NB2a cells.
- Assessment of phosphorylated ERK1/2 (pERK1/2) and CREB (pCREB) levels.
- Quantification of BDNF mRNA levels.
- Comparison between differentiated and undifferentiated NB2a cells.
Main Results:
- In undifferentiated NB2a cells, CacyBP/SIP overexpression decreased pERK1/2 levels.
- CREB activity and BDNF mRNA levels correlated with pERK1/2 levels, indicating downstream regulation.
- In differentiated NB2a cells, CacyBP/SIP overexpression had a different effect on pERK1/2 compared to undifferentiated cells.
- Post-translational modifications and protein interactions of CacyBP/SIP may explain its distinct functions in different cell states.
Conclusions:
- CacyBP/SIP is implicated in the ERK1/2-CREB-BDNF signaling pathway.
- The regulatory role of CacyBP/SIP in this pathway is dependent on the differentiation stage of NB2a cells.
- CacyBP/SIP's function may be modulated by its post-translational modifications and protein partners.
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