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Updated: Oct 13, 2026
Prediction and Validation of Gene Regulatory Elements Activated During Retinoic Acid Induced Embryonic Stem Cell Differentiation
Published on: June 21, 2016
Gene expression networks underlying retinoic acid-induced differentiation of acute promyelocytic leukemia cells
1Shanghai Institute of Hematology, Ruijin Hospital, Shanghai Second Medical University, Shanghai, China.
Abstract:
To elucidate the molecular mechanism of all-trans-retinoic acid (ATRA)-induced differentiation of acute promyelocytic leukemia (APL) cells, the gene expression patterns in the APL cell line NB(4) before and after ATRA treatment were analyzed using complementary DNA array, suppression-subtractive hybridization, and differential-display-polymerase chain reaction. A total of 169 genes, including 8 novel ones, were modulated by ATRA. The ATRA-induced gene expression profiles were in high accord with the differentiation and proliferation status of the NB(4) cells. The time courses of their modulation were interesting. Among the 100 up-regulated genes, the induction of expression occurred most frequently 12-48 hours after ATRA treatment, while 59 of 69 down-regulated genes found their expression suppressed within 8 hours. The transcriptional regulation of 8 induced and 24 repressed genes was not blocked by cycloheximide, which suggests that these genes may be direct targets of the ATRA signaling pathway. A balanced functional network seemed to emerge, and it formed the foundation of decreased cellular proliferation, maintenance of cell viability, increased protein modulation, and promotion of granulocytic maturation. Several cytosolic signaling pathways, including JAKs/STAT and MAPK, may also be implicated in the symphony of differentiation. (Blood. 2000;96:1496-1504)
Insights
All-trans-retinoic acid (ATRA) triggers acute promyelocytic leukemia (APL) cell differentiation by modulating 169 genes. This molecular mechanism involves direct ATRA signaling pathway targets, promoting granulocytic maturation and decreasing proliferation.
Area of Science:
- Molecular Biology
- Hematology
- Cancer Research
Background:
- Acute promyelocytic leukemia (APL) is a distinct subtype of leukemia.
- All-trans-retinoic acid (ATRA) is a key therapeutic agent for APL.
- The precise molecular mechanisms underlying ATRA-induced APL cell differentiation require elucidation.
Purpose of the Study:
- To investigate the gene expression patterns in APL cells following ATRA treatment.
- To identify novel genes modulated by ATRA in APL.
- To understand the molecular pathways involved in ATRA-induced APL differentiation.
Main Methods:
- Gene expression profiling using complementary DNA array, suppression-subtractive hybridization, and differential-display-polymerase chain reaction.
- Analysis of gene modulation in the NB(4) APL cell line before and after ATRA treatment.
- Cycloheximide treatment to identify direct transcriptional targets of ATRA.
Main Results:
- A total of 169 genes, including 8 novel genes, were modulated by ATRA.
- ATRA-induced gene expression changes correlated with cellular differentiation and proliferation status.
- Distinct temporal patterns of gene up-regulation (12-48 hours) and down-regulation (within 8 hours) were observed.
- 8 induced and 24 repressed genes were identified as potential direct targets of the ATRA signaling pathway.
- Evidence suggests the emergence of a functional network supporting decreased proliferation, maintained viability, and granulocytic maturation.
Conclusions:
- ATRA induces differentiation in APL cells through significant modulation of gene expression.
- The study identified direct transcriptional targets, implicating specific genes in the ATRA signaling pathway.
- A complex network of gene regulation underlies ATRA's therapeutic effects in APL, involving pathways like JAKs/STAT and MAPK.
