Targeting MAO-A With Ultrafast Kinetics: Affinity Probes for Precision Imaging of Brain Pathologies and Depression...

Area of Science:

• Biochemistry
• Neuroscience
• Medical Imaging

Background:

• Major depressive disorder (MDD) lacks objective diagnostic biomarkers.
• Monoamine oxidase A (MAO-A) is upregulated in depressed brains and is a potential pathological biomarker.
• Current MAO-A probes have limitations, including reliance on enzymatic reactions and slow response times.

Purpose of the Study:

• To design and develop novel probes for rapid, specific, and affinity-based detection of MAO-A.
• To overcome the limitations of existing MAO-A detection methods.
• To enable non-invasive imaging of MAO-A in the context of MDD.

Main Methods:

• Design of near-infrared fluorescent probes (JBDs) with large Stokes shifts.
• Utilizing affinity-based recognition, independent of enzymatic reactions.
• Testing probe performance in live cells, orthotopic glioma mouse models, and depressive mouse brains.

Main Results:

• JBD probes demonstrated rapid response times (< 5 s) and exceptional specificity for MAO-A.
• Enabled precise MAO-A imaging in overexpressing cells and visualized MAO-A in glioma mouse models.
• Successfully achieved non-invasive imaging of MAO-A upregulation in depressive mouse brains.

Conclusions:

• JBD probes represent a significant advancement for MAO-A detection, offering superior speed and specificity.
• The probes facilitate direct visualization of MAO-A upregulation associated with MDD.
• This work supports the use of JBDs for detecting and dissecting MAO-A-mediated mechanisms in depression.