Ambre Dauba , Thi Hong Van Nguyen , Thomas Ador , Claire Spitzlei , Estelle Porret , Laurène Jourdain , Erwan Selingue , Laurence Moine , Jean-Luc Gennisson , Charles Truillet , Benoit Larrat , Sébastien Mériaux , Anthony Delalande , Nicolas Tsapis , Anthony Novell
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引用次数: 0
Abstract
Microbubble-mediated focused ultrasound is a promising strategy for transient and localized blood-brain barrier (BBB) permeabilization, enabling drug delivery to the brain. Optimizing microbubble stability and acoustic response is essential to maximize treatment efficiency and minimize potential damage. This study introduces an innovative microbubble formulation with a phospholipid-fluoropolymer shell (LIP-POL), designed to enhance circulation persistence while maintaining a low cavitation threshold. The physicochemical and acoustic properties of LIP-POL microbubbles were systematically compared with phospholipid-shell microbubbles (LIP) and the commercial agent SonoVue®. Both SonoVue and LIP-POL microbubbles have similar concentrations and sizes (approximately 5 × 108 bubbles/mL, mean size of 2.5-2.7 µm), whereas LIP microbubbles are around 100 times more concentrated (7.3 × 1010 bubbles/mL) and slightly smaller (1.9 µm). In vitro, ultra-harmonics appeared at 120 kPa for LIP, 150 kPa for LIP-POL, and 200 kPa for SonoVue (fc = 1 MHz, PRF = 10 kHz, 40 cycles). Consistent with microbubbles’ acoustic signature, the BBB opening threshold (fc = 1.5 MHz) occurred at lower Mechanical Indices (MI) for LIP and LIP-POL microbubbles (MI = 0.16) compared to SonoVue (MI = 0.20). Stability of circulating microbubbles was assessed using BBB permeabilization protocol at various time points post microbubble-injection. LIP-POL microbubbles remained effective for up to 15 min post-injection, compared to 7.5 min for LIP and 5 min for SonoVue (2 × 107 microbubbles injected). The prolonged efficacy of LIP-POL microbubbles (three times longer than SonoVue) opens the possibility for extended ultrasound treatments, particularly for BBB permeabilization across larger areas in large animal models or humans.
期刊介绍:
Ultrasonics Sonochemistry stands as a premier international journal dedicated to the publication of high-quality research articles primarily focusing on chemical reactions and reactors induced by ultrasonic waves, known as sonochemistry. Beyond chemical reactions, the journal also welcomes contributions related to cavitation-induced events and processing, including sonoluminescence, and the transformation of materials on chemical, physical, and biological levels.
Since its inception in 1994, Ultrasonics Sonochemistry has consistently maintained a top ranking in the "Acoustics" category, reflecting its esteemed reputation in the field. The journal publishes exceptional papers covering various areas of ultrasonics and sonochemistry. Its contributions are highly regarded by both academia and industry stakeholders, demonstrating its relevance and impact in advancing research and innovation.