Assessing mature and immature collagen in tonsillar tissue using second harmonic generation microscopy

Area of Science:

• Biomedical Optics
• Tissue Engineering
• Pathology

Background:

• Recurrent tonsillitis (RT) and obstructive sleep apnoea (OSA) are common reasons for tonsillectomy.
• The underlying tissue pathology for RT and OSA is not well understood.
• Recurrent inflammation in RT may lead to collagen remodeling and extracellular matrix deposition.

Purpose of the Study:

• To investigate collagen distribution in palatine tonsils from RT and OSA patients.
• To apply label-free second harmonic generation (SHG) microscopy as a novel method for tissue analysis.
• To compare collagen remodeling patterns between RT and OSA.

Main Methods:

• Utilized label-free second harmonic generation (SHG) microscopy.
• Quantified the ratio of forward-to-backward SHG signals in palatine tonsils.
• Analyzed spatial distribution of SHG signals in epithelial and interior tissue regions.

Main Results:

• A higher mean area fraction of forward-to-backward SHG signals was observed in OSA compared to RT.
• Spatial analysis indicated higher SHG signals in OSA regions (epithelial and interior) versus RT.
• No statistically significant differences were found for either the overall ratio or spatial analyses.

Conclusions:

• SHG microscopy provides a new approach to assess collagen distribution in palatine tonsils.
• Observed trends suggest potential differences in collagen remodeling between OSA and RT.
• Further research with larger sample sizes may be needed to establish statistical significance.