Coherent Raman spectroscopic imaging to characterize microglia activation pathway

Area of Science:

• Neuroscience
• Immunology
• Biomedical Optics

Background:

• Microglia are the primary immune cells of the central nervous system (CNS).
• Activated microglia are key biomarkers for various brain conditions, but their detection is challenging.
• Current methods for identifying activated microglia phenotypes are often imprecise and cumbersome.

Purpose of the Study:

• To develop a novel optical assay for the detection and quantitative analysis of activated microglia.
• To investigate metabolic changes in microglia during activation using label-free imaging techniques.
• To establish new biomarkers for identifying active microglia in brain samples.

Main Methods:

• Utilized label-free coherent anti-Stokes Raman scattering (CARS) imaging.
• Monitored cellular proteins and lipids to analyze metabolic changes in microglia.
• Investigated microglia activation induced by bacterial lipopolysaccharide (LPS).

Main Results:

• Microglia activation is associated with significant upregulation in protein and lipid synthesis.
• CARS imaging successfully detected these metabolic changes in activated microglia.
• Elevated intracellular macromolecules were observed during microglia activation.

Conclusions:

• The developed optical assay enables label-free detection and analysis of activated microglia.
• Increased synthesis of proteins and lipids serves as a reliable indicator of microglia activation.
• This method offers a promising supplementary tool for diagnosing brain conditions via Raman imaging.