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Improving Radiation Response in Glioblastoma Using ECO/siRNA Nanoparticles Targeting DNA Damage Repair
Jennifer A Lee1, Nadia Ayat2, Zhanhu Sun2
1Radiation Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.
Abstract:
Radiation therapy is a mainstay in the standard of care for glioblastoma (GBM), thus inhibiting the DNA damage response (DDR) is a major strategy to improve radiation response and therapeutic outcomes. Small interfering RNA (siRNA) therapy holds immeasurable potential for the treatment of GBM, however delivery of the siRNA payload remains the largest obstacle for clinical implementation. Here we demonstrate the effectiveness of the novel nanomaterial, ECO (1-aminoethylimino[bis(N-oleoylcysteinylaminoethyl) propionamide]), to deliver siRNA targeting DDR proteins ataxia telangiectasia mutated and DNA-dependent protein kinase (DNApk-cs) for the radiosensitzation of GBM in vitro and in vivo. ECO nanoparticles (NPs) were shown to efficiently deliver siRNA and silence target protein expression in glioma (U251) and glioma stem cell lines (NSC11, GBMJ1). Importantly, ECO NPs displayed no cytotoxicity and minimal silencing of genes in normal astrocytes. Treatment with ECO/siRNA NPs and radiation resulted in the prolonged presence of γH2AX foci, indicators of DNA damage, and increased radiosensitivity in all tumor cell lines. In vivo, intratumoral injection of ECO/siDNApk-cs NPs with radiation resulted in a significant increase in survival compared with injection of NPs alone. These data suggest the ECO nanomaterial can effectively deliver siRNA to more selectively target and radiosensitize tumor cells to improve therapeutic outcomes in GBM.
Insights
A novel nanomaterial, ECO, effectively delivers small interfering RNA (siRNA) to inhibit DNA damage response (DDR) proteins in glioblastoma (GBM). This enhances radiation therapy effectiveness and improves survival rates for GBM patients.
Area of Science:
- Oncology
- Nanomedicine
- Molecular Biology
Background:
- Radiation therapy is a standard glioblastoma (GBM) treatment, but resistance limits efficacy.
- Inhibiting the DNA damage response (DDR) is a key strategy to enhance radiosensitivity.
- Effective delivery of small interfering RNA (siRNA) therapeutics for GBM remains a significant challenge.
Purpose of the Study:
- To evaluate the novel ECO nanomaterial for siRNA delivery to radiosensitize glioblastoma (GBM).
- To assess the efficacy of ECO nanoparticles (NPs) in silencing DDR targets and enhancing radiation therapy in vitro and in vivo.
Main Methods:
- ECO nanoparticles were synthesized to encapsulate siRNA targeting DDR proteins (ATM and DNA-PKcs).
- siRNA delivery and protein silencing were confirmed in glioma and glioma stem cell lines.
- Cytotoxicity and gene silencing in normal astrocytes were evaluated.
- Radiosensitization was assessed by measuring DNA damage (γH2AX foci) and cell survival.
- In vivo efficacy was determined by survival studies following intratumoral injection in a GBM model.
Main Results:
- ECO NPs efficiently delivered siRNA and silenced target DDR proteins in GBM cell lines with minimal impact on normal astrocytes.
- ECO/siRNA treatment combined with radiation prolonged DNA damage signaling and increased radiosensitivity in GBM cells.
- Intratumoral injection of ECO/siRNA NPs plus radiation significantly improved survival in vivo compared to NPs alone.
Conclusions:
- The ECO nanomaterial is a promising platform for targeted siRNA delivery in glioblastoma.
- ECO-mediated siRNA delivery enhances GBM radiosensitization and improves therapeutic outcomes.
- This approach offers a potential strategy to overcome therapeutic resistance in glioblastoma treatment.
