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Monodispersity Increases Adhesion Efficiency and Specificity for Ultrasound-Targeted Microbubbles
J Angel Navarro-Becerra1, Jair I Castillo2, Federico Di Ruzza2,3
1Mechanical Engineering Department, University of Colorado Boulder, Boulder, Colorado 80309-0427, United States.
ACS Biomaterials Science & Engineering
|September 26, 2022
Summary
Monodisperse microbubbles (MBs) enhanced ultrasound molecular imaging by improving RGD-peptide targeting efficiency and specificity. Optimized parameters like resonance frequency and low concentration maximize RGD-MB adhesion for disease diagnosis.
Area of Science:
- Ultrasound molecular imaging
- Biomedical engineering
- Nanotechnology
Background:
- Targeted microbubbles (MBs) enable noninvasive diagnosis and monitoring of endothelial diseases.
- Acoustic radiation force (F_rad) enhances MB adhesion at target sites.
Purpose of the Study:
- To investigate the impact of various microbubble parameters on F_rad-mediated targeting.
- To optimize F_rad targeting for enhanced ultrasound molecular imaging.
Main Methods:
- Utilized monodisperse and polydisperse MBs conjugated with RGD or RAD peptides.
- Tested MBs in an αvβ3 integrin-coated microvessel phantom under controlled shear stress.
- Assessed MB attachment by varying F_rad time, frequency, MB concentration, and size distribution.
Main Results:
- MB targeting increased with αvβ3 integrin density and F_rad time.
- Targeting and specificity improved near resonance frequencies.
- Monodisperse MBs demonstrated significantly enhanced targeting efficiency and specificity compared to polydisperse MBs.
- Optimal conditions identified: monodisperse MBs, near resonance, low concentration (~10^6 MB/mL) achieved up to 88% adhesion.
Conclusions:
- Monodisperse microbubbles are crucial for maximizing adhesion efficiency and specificity in ultrasound molecular imaging.
- Optimizing F_rad parameters, including frequency and concentration, is key for effective targeted MB delivery.
- This study provides a foundation for improved noninvasive diagnostic and monitoring tools for endothelial diseases.
