Related Experiment Video
Updated: Jun 27, 2026
Analysis of Combinatorial miRNA Treatments to Regulate Cell Cycle and Angiogenesis
Published on: March 30, 2019
ALDH isozymes downregulation affects cell growth, cell motility and gene expression in lung cancer cells
Jan S Moreb1, Henry V Baker, Lung-Ji Chang
1Department of Medicine, University of Florida, Gainesville, Florida, USA. morebjs@medicine.ufl.edu
Background:
Aldehyde dehydrogenase isozymes ALDH1A1 and ALDH3A1 are highly expressed in non small cell lung cancer. Neither the mechanisms nor the biologic significance for such over expression have been studied.
Methods:
We have employed oligonucleotide microarrays to analyze changes in gene profiles in A549 lung cancer cell line in which ALDH activity was reduced by up to 95% using lentiviral mediated expression of siRNA against both isozymes (Lenti 1+3). Stringent analysis methods were used to identify gene expression patterns that are specific to the knock down of ALDH activity and significantly different in comparison to wild type A549 cells (WT) or cells similarly transduced with green fluorescent protein (GFP) siRNA.
Results:
We confirmed significant and specific down regulation of ALDH1A1 and ALDH3A1 in Lenti 1+3 cells and in comparison to 12 other ALDH genes detected. The results of the microarray analysis were validated by real time RT-PCR on RNA obtained from Lenti 1+3 or WT cells treated with ALDH activity inhibitors. Detailed functional analysis was performed on 101 genes that were significantly different (P < 0.001) and their expression changed by > or = 2 folds in the Lenti 1+3 group versus the control groups. There were 75 down regulated and 26 up regulated genes. Protein binding, organ development, signal transduction, transcription, lipid metabolism, and cell migration and adhesion were among the most affected pathways.
Conclusion:
These molecular effects of the ALDH knock-down are associated with in vitro functional changes in the proliferation and motility of these cells and demonstrate the significance of ALDH enzymes in cell homeostasis with a potentially significant impact on the treatment of lung cancer.
Insights
Reducing aldehyde dehydrogenase (ALDH) enzymes ALDH1A1 and ALDH3A1 in non-small cell lung cancer cells impacts gene expression and cell functions. This highlights ALDH
Area of Science:
- Molecular Biology
- Oncology
- Gene Expression Analysis
Background:
- Aldehyde dehydrogenase (ALDH) isozymes ALDH1A1 and ALDH3A1 are highly expressed in non-small cell lung cancer (NSCLC).
- The mechanisms and biological significance of ALDH overexpression in NSCLC remain largely unstudied.
Purpose of the Study:
- To investigate the gene expression profiles and biological significance of ALDH1A1 and ALDH3A1 in NSCLC.
- To understand the impact of ALDH activity reduction on cellular functions in lung cancer.
Main Methods:
- Oligonucleotide microarrays were used to analyze gene expression changes in A549 lung cancer cells with reduced ALDH activity via lentiviral siRNA.
- Gene expression patterns specific to ALDH knockdown were identified and compared to control groups (wild type and GFP siRNA).
- Real-time RT-PCR validated microarray findings, and functional analysis was performed on significantly altered genes.
Main Results:
- Significant downregulation of ALDH1A1 and ALDH3A1 was confirmed in ALDH-knockdown cells.
- Microarray analysis revealed 75 downregulated and 26 upregulated genes, affecting pathways like protein binding, organ development, and cell migration.
- Functional analysis identified significant changes in gene expression with > or = 2-fold changes (P < 0.001).
Conclusions:
- ALDH knockdown in lung cancer cells leads to molecular changes associated with altered proliferation and motility.
- These findings underscore the critical role of ALDH enzymes in maintaining cell homeostasis.
- The study suggests a potentially significant impact of targeting ALDH enzymes in lung cancer treatment.
Related Concept Videos
02:53Adaptive Mechanisms in Cancer Cells
Some of the advantages that cancer cells have on normal cells include - enhanced ability to divide without terminally differentiating, induce new blood vessel formation,...
01:58Cell Specific Gene Expression
02:23Abnormal Proliferation