Kupffer Cell Capture-Evading Modifiable Sub-20 nm Lipid Nanodisc-Based ¹⁹F Magnetic Resonance Imaging Probes

Area of Science:

• Biomedical Imaging
• Nanotechnology
• Magnetic Resonance Imaging

Background:

• ¹⁹F MRI enables sensitive visualization of ¹⁹F probes in biomedical applications.
• Conventional probes face limitations in size, Kupffer cell uptake, and signal intensity.
• Existing smaller probes often have reduced ¹⁹F mobility and weak signals.

Purpose of the Study:

• To develop novel, sub-20 nm ¹⁹F MRI probes using lipid nanodiscs.
• To overcome limitations of conventional emulsion-based and nanocrystal/polymer probes.
• To enhance probe delivery efficiency and signal intensity for in vivo imaging.

Main Methods:

• Utilized lipid nanodiscs to encapsulate highly mobile ¹⁹F-labeled lipids.
• Engineered probes with diameters around 10 nm.
• Investigated in vivo behavior, including Kupffer cell interaction, excretion, and detectability after surface modification (PEGylation).

Main Results:

• Developed sub-20 nm ¹⁹F MRI probes with high ¹⁹F mobility.
• Probes demonstrated avoidance of Kupffer cell uptake and renal excretion.
• MR signals were detectable post-modification, with PEGylated nanodiscs showing prolonged circulation.
• Achieved improved delivery to previously inaccessible tissues.

Conclusions:

• Lipid nanodiscs provide a platform for creating small, highly mobile ¹⁹F MRI probes.
• These probes offer improved in vivo performance, overcoming limitations of conventional methods.
• The nanodisc platform has broad potential for diverse biomedical imaging and monitoring applications.