Miniaturized Implantable Fluorescence Probes Integrated with Metal-Organic Frameworks for Deep Brain Dopamine Sensing

Area of Science:

• Neuroscience
• Materials Science
• Biomedical Engineering

Background:

• Continuous neurotransmitter monitoring is crucial for understanding neural mechanisms and neurological diseases.
• Existing methods may lack the sensitivity or miniaturization required for deep brain applications.

Purpose of the Study:

• To develop a miniaturized, implantable fluorescence probe for sensitive deep brain dopamine sensing.
• To demonstrate the probe's utility in real-time dopamine monitoring during in vivo experiments.

Main Methods:

• Integration of thinned light-emitting diodes (LEDs) and phototransistors into a 120 μm thick probe.
• Utilizing a fluorescent metal-organic framework (MOF) with specific dopamine binding capabilities.
• Development of a compact, wireless circuit for data acquisition and transmission.
• In vivo testing in rats for continuous dopamine level monitoring during deep brain stimulation.

Main Results:

• Achieved a highly sensitive dopamine detection limit of 79.9 nM.
• Successfully monitored real-time dopamine dynamics in rat brains during deep brain stimulation.
• Demonstrated favorable biocompatibility through cytotoxicity and immunofluorescence analyses.

Conclusions:

• The developed probe offers a novel platform for sensitive, real-time dopamine monitoring in deep brain regions.
• The integration of MOFs and flexible electronics paves the way for advanced brain-computer interfaces.
• This technology holds potential for neuroscience research, disease tracing, and smart diagnostic applications.