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Updated: Jul 7, 2026
Analysis of Retinoic Acid-induced Neural Differentiation of Mouse Embryonic Stem Cells in Two and Three-dimensional Embryoid Bodies
Published on: April 22, 2017
CYP26A1 knockout embryonic stem cells exhibit reduced differentiation and growth arrest in response to retinoic acid
Simne Langton1, Lorraine J Gudas
1Department of Pharmacology, Weill Cornell Medical College, 1300 York Avenue, Rm. E-409, New York, NY 10021, USA.
Abstract:
CYP26A1, a cytochrome P450 enzyme, metabolizes all-trans-retinoic acid (RA) into polar metabolites, e.g. 4-oxo-RA and 4-OH-RA. To determine if altering RA metabolism affects embryonic stem (ES) cell differentiation, we disrupted both alleles of Cyp26a1 by homologous recombination. CYP26a1(-/-) ES cells had a 11.0+/-3.2-fold higher intracellular RA concentration than Wt ES cells after RA treatment for 48 h. RA-treated CYP26A1(-/-) ES cells exhibited 2-3 fold higher mRNA levels of Hoxa1, a primary RA target gene, than Wt ES cells. Despite increased intracellular RA levels, CYP26a1(-/-) ES cells were more resistant than Wt ES cells to RA-induced proliferation arrest. Transcripts for parietal endodermal differentiation markers, including laminin, J6(Hsp 47), and J31(SPARC, osteonectin) were expressed at lower levels in RA-treated CYP26a1(-/-) ES cells, indicating that the lack of CYP26A1 activity inhibits RA-associated differentiation. Microarray analyses revealed that RA-treated CYP26A1(-/-) ES cells exhibited lower mRNA levels than Wt ES cells for genes involved in differentiation, particularly in neural (Epha4, Pmp22, Nrp1, Gap43, Ndn) and smooth muscle differentiation (Madh3, Nrp1, Tagln Calponin, Caldesmon1). In contrast, genes involved in the stress response (e.g. Tlr2, Stk2, Fcgr2b, Bnip3, Pdk1) were expressed at higher levels in CYP26A1(-/-) than in Wt ES cells without RA. Collectively, our results show that CYP26A1 activity regulates intracellular RA levels, cell proliferation, transcriptional regulation of primary RA target genes, and ES cell differentiation to parietal endoderm.
Insights
Disrupting CYP26A1 in embryonic stem cells increases all-trans-retinoic acid (RA) levels but impairs RA-induced differentiation and proliferation arrest, revealing CYP26A1
Area of Science:
- Stem cell biology
- Molecular biology
- Biochemistry
Background:
- Cytochrome P450 family member CYP26A1 metabolizes all-trans-retinoic acid (RA).
- RA is a crucial regulator of embryonic stem (ES) cell differentiation.
- The role of RA metabolism in ES cell differentiation requires further elucidation.
Purpose of the Study:
- To investigate the impact of altered RA metabolism on ES cell differentiation.
- To determine if disrupting CYP26A1 affects RA signaling and downstream effects in ES cells.
Main Methods:
- Homologous recombination was used to disrupt both alleles of Cyp26a1 in mouse ES cells.
- Quantitative real-time PCR was employed to measure mRNA levels of target genes.
- Microarray analysis was performed to assess global gene expression changes.
Main Results:
- CYP26A1-deficient ES cells exhibited significantly higher intracellular RA concentrations after RA treatment.
- RA-treated CYP26A1(-/-) ES cells showed reduced expression of parietal endoderm differentiation markers.
- Genes involved in neural and smooth muscle differentiation were downregulated in CYP26A1(-/-) ES cells.
- Genes associated with the stress response were upregulated in CYP26A1(-/-) ES cells.
Conclusions:
- CYP26A1 activity is critical for regulating intracellular RA levels and modulating RA-mediated effects in ES cells.
- Inhibition of CYP26A1 impairs RA-induced differentiation and proliferation arrest in ES cells.
- CYP26A1 plays a key role in the transcriptional regulation of RA target genes and ES cell differentiation pathways.
