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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
pRB2/p130 target genes in non-small lung cancer cells identified by microarray analysis
Giuseppe Russo1, Pier Paolo Claudio, Yan Fu
1Sbarro Institute for Cancer Research and Molecular Medicine, College of Science and Technology, Temple University, Philadelphia, PA 19122, USA.
Abstract:
The retinoblastoma gene family consisting of RB/p105, p107, and RB2/p130 cooperate to regulate cell-cycle progression through the G1 phase of the cell cycle. Previous data demonstrated an independent role for the reduction or loss of pRb2/p130 expression in the formation and/or progression of lung carcinoma. Rb2/p130 is mutated in a human cell line of lung small cell carcinoma as well as in primary lung tumors. To identify potential pRb2/p130 target genes in an unbiased manner, we have utilized an adenovirus-mediated expression system of pRb2/p130 in a non-small lung cancer cell line to identify specific genes that are regulated by pRb2/p130. Using oligonucleotide arrays, a number of Rb2/p130 downregulated genes were identified and their regulation was confirmed by semiquantitative reverse transcription-polymerase chain reaction (RT-PCR) and Western blot analysis. As a result, 40 genes showed greater than 2.0-fold modification in their expression level after the RB2/p130 viral transduction. In conclusion, coupling adenoviral overexpression with microarray and semiquantitative RT-PCR analyses proved to be a versatile strategy for identifying pRb2/p130 target genes and for better understanding the expression profiles of these genes. Our results may also contribute to identifying novel therapeutic biomarkers in lung carcinoma.
Insights
Researchers identified genes regulated by RB2/p130, a protein crucial for cell cycle control. This study enhances understanding of lung carcinoma development and may reveal new therapeutic biomarkers.
Area of Science:
- Molecular Biology
- Oncology
- Cell Biology
Background:
- The retinoblastoma gene family (RB/p105, p107, RB2/p130) regulates cell cycle progression.
- Reduced RB2/p130 expression is linked to lung carcinoma development and progression.
- RB2/p130 mutations are found in lung cancer cell lines and primary tumors.
Purpose of the Study:
- To identify genes regulated by RB2/p130 in lung cancer.
- To understand the role of RB2/p130 in lung carcinoma pathogenesis.
Main Methods:
- Adenovirus-mediated expression of RB2/p130 in a non-small lung cancer cell line.
- Oligonucleotide microarrays to identify gene expression changes.
- Semiquantitative RT-PCR and Western blot analysis for validation.
Main Results:
- Identified numerous RB2/p130-downregulated genes.
- Confirmed regulation of specific genes by RB2/p130.
- Observed significant expression modification in 40 genes post-transduction.
Conclusions:
- Adenoviral overexpression combined with microarray and RT-PCR is effective for identifying target genes.
- Findings provide insights into RB2/p130-mediated gene expression profiles.
- Results may aid in discovering novel therapeutic biomarkers for lung carcinoma.
