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Gene expression profile changes in NB4 cells induced by arsenic trioxide
Huai-Yu Wang1, Shan-Xi Liu, Mei Zhang
1Department of Hematology, First Hospital of Xi'an Jiaotong University, Xi'an 710061, China. whuaiyu@sina.com
Aim:
To investigate the gene expression profiles of acute promyelocytic leukemia (APL) cell line NB4 treated with arsenic trioxide (As2O3) using cDNA microarray.
Methods:
Two cDNA probes were prepared through reverse transcription from mRNA of NB4 cells treated with or without arsenic trioxide. The probes were labeled with Cy3 and Cy5 fluorescence dyes individually, hybridized with cDNA microarray representing 1003 different human genes, and their fluorescent intensities were scanned. The genes were screened through the analysis of the difference in two gene expression profiles.
Results:
The analysis of gene expression profiles indicated that after the treatment of arsenic trioxide (0.5 micromol/L) 3 genes were up-regulated, among which, PSMB6 gene was involved in proteasome degradation pathway, and 18 genes related to RNA processing, protein synthesis, and signal transduction were down-regulated.
Conclusion:
PSMB6 and ITGB1 genes may be related to the differentiation and/or apoptosis of NB4 cells induced by As2O3.
Insights
Arsenic trioxide treatment of acute promyelocytic leukemia (APL) cells altered gene expression. PSMB6 gene upregulation and downregulation of RNA processing and protein synthesis genes suggest roles in APL cell differentiation or apoptosis.
Area of Science:
- Molecular Biology
- Genomics
- Cancer Research
Background:
- Acute promyelocytic leukemia (APL) is a subtype of leukemia characterized by specific genetic translocations.
- Arsenic trioxide (As2O3) is a known therapeutic agent for APL, inducing differentiation and apoptosis in cancer cells.
- Understanding the molecular mechanisms of As2O3 action is crucial for optimizing APL treatment.
Purpose of the Study:
- To investigate the global gene expression changes in the NB4 APL cell line upon treatment with arsenic trioxide.
- To identify specific genes and pathways affected by As2O3 that may mediate its anti-leukemic effects.
Main Methods:
- NB4 cells were treated with arsenic trioxide (0.5 micromol/L).
- Messenger RNA (mRNA) was extracted and converted to complementary DNA (cDNA) probes.
- cDNA microarray analysis was performed to compare gene expression profiles between treated and untreated cells, analyzing 1003 human genes.
Main Results:
- Arsenic trioxide treatment resulted in the upregulation of 3 genes and downregulation of 18 genes.
- The upregulated PSMB6 gene is involved in the proteasome degradation pathway.
- Downregulated genes were associated with RNA processing, protein synthesis, and signal transduction.
Conclusions:
- The study identified specific gene expression alterations in APL cells treated with As2O3.
- PSMB6 and ITGB1 genes are suggested to play a role in As2O3-induced differentiation and/or apoptosis of NB4 cells.
- These findings contribute to understanding the molecular basis of arsenic trioxide's efficacy in APL treatment.
