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Updated: May 23, 2025

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Using RNA-sequencing to Detect Novel Splice Variants Related to Drug Resistance in In Vitro Cancer Models
Published on: December 9, 2016
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Resistance to Radiation Enhances Metastasis by Altering RNA Metabolism.
Ayush Kumar1, Kensei Kishimoto1, Hira Lal Goel1
1Departments of Molecular, Cell and Cancer Biology, University of Massachusetts Chan Medical School, Worcester MA.
Biorxiv : the Preprint Server for Biology
|March 10, 2025
Summary
Radiation resistance in triple-negative breast cancer cells enhances metastasis, particularly to bone. This occurs via increased integrin β3 expression, driven by RNA metabolism changes involving HNRNPL and circRNAs.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- Therapy resistance is linked to cancer metastasis.
- The connection between radiation resistance and metastasis is less understood than chemotherapy resistance.
- Triple-negative breast cancer (TNBC) serves as a model for this investigation.
Purpose of the Study:
- To investigate the causal link between radiation resistance and metastasis in TNBC.
- To elucidate the molecular mechanisms driving radiation-induced metastasis.
Main Methods:
- Investigated radiation-resistant TNBC cell lines.
- Analyzed gene expression changes, focusing on integrin β3 (ITGβ3).
- Utilized bioinformatic analysis and experimental validation of RNA metabolism pathways, including HNRNPL, circRNAs, and let-7 microRNAs.
Main Results:
- Radiation-resistant TNBC cells exhibit enhanced metastatic capacity, especially to bone.
- Radiation resistance upregulates ITGβ3 expression, promoting cell migration and invasion.
- Identified RNA metabolism pathways, mediated by HNRNPL and circRNAs, that stabilize ITGβ3 transcripts by acting as ceRNAs for let-7 microRNAs.
Conclusions:
- A novel mechanism links radiation resistance to metastasis in TNBC through altered RNA metabolism.
- HNRNPL-mediated circRNAs play a key role in stabilizing ITGβ3, driving metastatic potential.
- Findings offer insights into improving cancer screening and treatment strategies.
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