Second-Generation Gadolinium-Bismuth Ultrasmall Nanoparticles Amplify the Effects of Clinical Radiation Therapy and Provide Clinical Magnetic Resonance Imaging Contrast
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View abstract on PubMed
Summary
This summary is machine-generated.The new AGuIX-Bi nanoparticles, containing bismuth, significantly improved non-small cell lung cancer treatment by delaying tumor growth more effectively than AGuIX nanoparticles. This enhanced efficacy was achieved without compromising magnetic resonance imaging contrast.
Area Of Science
- Nanomedicine
- Radiopharmaceuticals
- Oncology
Background
- AGuIX nanoparticles (gadolinium-chelated polysiloxane) are evaluated for radiation therapy (RT).
- A novel AGuIX-Bi generation replaces 70% of gadolinium with bismuth for enhanced dose amplification.
- This modification aims to improve therapeutic efficacy while maintaining MRI contrast.
Purpose Of The Study
- To investigate the therapeutic efficacy of AGuIX-Bi nanoparticles in non-small cell lung cancer (NSCLC) models.
- To evaluate AGuIX-Bi performance under clinical megavoltage RT and 3T MRI conditions.
- To compare the efficacy of AGuIX-Bi with AGuIX and saline controls.
Main Methods
- Two NSCLC models (murine LLC and human A549) were used in mice.
- Animals received saline, AGuIX, or AGuIX-Bi injections 24 hours before 10 Gy RT.
- Tumor growth was monitored via time-to-tumor doubling; MRI phantom and in vivo imaging were performed.
Main Results
- AGuIX-Bi + RT significantly reduced tumor growth compared to saline + RT and AGuIX + RT (P < .05).
- Median time-to-tumor doubling increased by 160% for A549 and 60% for LLC models with AGuIX-Bi + RT.
- AGuIX-Bi demonstrated longitudinal relaxivity (r1) of 8.4/mM/s, comparable to AGuIX (6.9/mM/s), with adequate MRI contrast.
Conclusions
- AGuIX-Bi nanoparticles are more effective than AGuIX in delaying tumor growth in NSCLC models.
- Bismuth incorporation enhances AGuIX efficacy under clinical RT energies without compromising MRI performance.
- AGuIX-Bi shows promise as an improved radiopharmaceutical agent for NSCLC treatment.
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