Glycosaminoglycan profiling in different cell types using infrared spectroscopy and imaging

Area of Science:

• Biophysical Chemistry
• Cell Biology
• Spectroscopy

Background:

• Glycosaminoglycans (GAGs) are crucial biomolecules involved in various physiological and pathological processes.
• Previous work identified vibrational spectroscopic markers for standard GAG molecules.

Purpose of the Study:

• To extend the investigation of GAG vibrational spectroscopy to complex biological systems, specifically different cell types.
• To characterize cell types based on their GAG synthesis capacities using spectral profiles.

Main Methods:

• Analysis of individual GAG standards and mixtures using high-throughput infrared spectroscopy.
• Spectroscopic analysis of GAG-defective mutant Chinese hamster ovary (CHO)-745 cells, wild-type CHO cells, and chondrocytes in suspension and as single cells.
• Application of unsupervised chemometric methods, including hierarchical cluster analysis and principal component analysis, for spectral data interpretation.

Main Results:

• Vibrational spectral profiles were sufficiently discriminant to differentiate between cell types at both cell suspension and single-cell levels.
• The technique demonstrated the ability to perform spectral profiling and identify cells with varying GAG synthesis potentials.
• Infrared microspectroscopy/imaging successfully delineated distinct cell populations based on their biochemical signatures.

Conclusions:

• Vibrational spectroscopy, particularly infrared microspectroscopy/imaging, is a powerful tool for characterizing cell types based on GAG synthesis.
• This technique holds promise for cell screening applications, aiding in the identification of GAG molecules in normal and pathological tissues.
• Potential applications include studying aging, healing processes, arthritis, and cancer through GAG analysis in situ.