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Orphan receptor COUP-TF I antagonizes retinoic acid-induced neuronal differentiation
K Neuman1, A Soosaar, H O Nornes
1Department of Anatomy and Neurobiology, Colorado State University, Fort Collins 80523, USA.
Abstract:
Chicken ovalbumin upstream promoter-transcription factors (COUP-TF) are expressed in the developing nervous system and interact with nuclear hormone receptors to regulate expression of different genes. The role of COUP-TF orphan receptors in neurogenesis is virtually unknown. To study the possible function of COUP-TF I during neuronal differentiation, we generated COUP-TF I overexpressing teratocarcinoma PCC7 cell lines and analyzed retinoic acid (RA)-induced neuronal differentiation of these cells. COUP-TF I overexpression results in the blockade of morphological differentiation after induction to differentiate. COUP-TF I represses expression of microtubule-associated protein 2 (MAP2) gene and delays induction of growth-associated protein 43 (GAP43) gene expression. In contrast, expression of the neurofilament light subunit (NF-L) gene is not affected by COUP-TF I overexpression during neuronal differentiation. Also, cells overexpressing COUP-TF I do not stop proliferating after RA and dBcAMP treatment and possess suppressed transcriptional activation from different RA response elements. These results suggest that COUP-TF I plays an important role in regulating RA-induced neuronal differentiation.
Insights
Chicken ovalbumin upstream promoter-transcription factors (COUP-TF) I overexpression blocks neuronal differentiation. This orphan receptor represses key gene expression, impacting retinoic acid-induced neural development.
Area of Science:
- Neuroscience
- Developmental Biology
- Molecular Biology
Background:
- Chicken ovalbumin upstream promoter-transcription factors (COUP-TF) are involved in gene regulation within the nervous system.
- The specific role of COUP-TF orphan receptors in neurogenesis remains largely unexplored.
Purpose of the Study:
- To investigate the function of COUP-TF I during retinoic acid (RA)-induced neuronal differentiation.
- To elucidate the impact of COUP-TF I overexpression on neuronal development in teratocarcinoma cells.
Main Methods:
- Generation of teratocarcinoma PCC7 cell lines overexpressing COUP-TF I.
- Analysis of RA-induced neuronal differentiation, including morphological changes and gene expression profiling.
- Assessment of cell proliferation and transcriptional activity from retinoic acid response elements.
Main Results:
- COUP-TF I overexpression inhibited morphological differentiation following RA induction.
- Repression of microtubule-associated protein 2 (MAP2) and delayed induction of growth-associated protein 43 (GAP43) gene expression were observed.
- Cells overexpressing COUP-TF I continued proliferating and showed suppressed transcriptional activation from RA response elements, while neurofilament light subunit (NF-L) expression remained unaffected.
Conclusions:
- COUP-TF I acts as a significant regulator in retinoic acid-induced neuronal differentiation.
- Overexpression of COUP-TF I disrupts normal neuronal development by interfering with differentiation pathways and gene expression.