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An In Vitro Protocol for Evaluating MicroRNA Levels, Functions, and Associated Target Genes in Tumor Cells
Published on: May 21, 2019
Expression of microRNAs in the NCI-60 cancer cell-lines
Santosh K Patnaik1, Jesper Dahlgaard, Wiktor Mazin
1Department of Thoracic Surgery, Roswell Park Cancer Institute, Buffalo, NY, USA.
Abstract:
The NCI-60 panel of 60 human cancer cell-lines of nine different tissues of origin has been extensively characterized in biological, molecular and pharmacological studies. Analyses of data from such studies have provided valuable information for understanding cellular processes and developing strategies for the diagnosis and treatment of cancer. Here, Affymetrix® GeneChip™ miRNA version 1 oligonucleotide microarrays were used to quantify 847 microRNAs to generate an expression dataset of 495 (58.4%) microRNAs that were identified as expressed in at least one cell-line of the NCI-60 panel. Accuracy of the microRNA measurements was partly confirmed by reverse transcription and polymerase chain reaction assays. Similar to that seen among the four existing NCI-60 microRNA datasets, the concordance of the new expression dataset with the other four was modest, with mean Pearson correlation coefficients of 0.37-0.54. In spite of this, comparable results with different datasets were noted in clustering of the cell-lines by their microRNA expression, differential expression of microRNAs by the lines' tissue of origin, and correlation of specific microRNAs with the doubling-time of cells or their radiation sensitivity. Mutation status of the cell-lines for the TP53, PTEN and BRAF but not CDKN2A or KRAS cancer-related genes was found to be associated with changes in expression of specific microRNAs. The microRNA dataset generated here should be valuable to those working in the field of microRNAs as well as in integromic studies of the NCI-60 panel.
Insights
This study quantifies microRNA expression across 60 human cancer cell lines, revealing associations between microRNA levels, gene mutations, and cellular characteristics like doubling time and radiation sensitivity.
Area of Science:
- Genomics
- Cancer Biology
- Molecular Oncology
Background:
- The NCI-60 panel is a crucial resource for cancer research, extensively characterized for biological, molecular, and pharmacological insights.
- Understanding microRNA (miRNA) expression is vital for cancer diagnosis and treatment strategies.
Purpose of the Study:
- To generate a comprehensive microRNA expression dataset for the NCI-60 human cancer cell line panel.
- To explore correlations between miRNA expression, tissue of origin, cellular characteristics, and cancer-related gene mutations.
Main Methods:
- Utilized Affymetrix® GeneChip™ miRNA version 1 oligonucleotide microarrays to quantify 847 microRNAs.
- Confirmed miRNA measurement accuracy using reverse transcription and polymerase chain reaction assays.
- Analyzed expression data for 495 identified microRNAs across the NCI-60 panel.
Main Results:
- Generated a novel dataset of expressed microRNAs in the NCI-60 panel, showing modest concordance with previous datasets.
- Observed consistent cell-line clustering, differential miRNA expression by tissue origin, and correlations with doubling time and radiation sensitivity.
- Identified associations between specific microRNA expression changes and mutations in TP53, PTEN, and BRAF genes.
Conclusions:
- The generated microRNA expression dataset provides a valuable resource for cancer research and integromic studies.
- Findings highlight the role of microRNAs in cancer cell biology and their potential as biomarkers or therapeutic targets.
- The study underscores the utility of the NCI-60 panel for dissecting complex molecular mechanisms in cancer.
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