Longitudinal Study of Cirrhosis Development in STAM and carbon tetrachloride Mouse Models Using Fourier Transform...

Area of Science:

• Biochemistry
• Histology
• Medical Imaging

Background:

• Cirrhosis progression involves complex pathological changes.
• Understanding early molecular events is crucial for therapeutic strategies.
• Animal models are essential for studying liver disease pathogenesis.

Purpose of the Study:

• To investigate the sequential molecular changes during cirrhosis development using Fourier transform infrared (FTIR) spectral histology.
• To compare these changes in two distinct mouse models: STAM (metabolic) and carbon tetrachloride-induced cirrhosis.
• To identify early biochemical markers of liver damage and progression.

Main Methods:

• Utilized formalin-fixed, paraffin-embedded liver samples from mice at multiple time points across two cirrhosis models.
• Employed FTIR spectral histology with high-resolution pixel sizes (25 μm and 6.25 μm).
• Applied k-means clustering analysis to spectral data, focusing on the 1000-1350 cm⁻¹ range, to identify distinct spectral classes related to biochemical composition.

Main Results:

• FTIR analysis revealed a significant decrease in glycogen-associated spectral features in early stages of liver damage, becoming minimal in cirrhotic tissue.
• A progressive increase in nucleic acid-associated spectral features was observed throughout the development of hepatic lesions.
• These biochemical shifts were consistent across both metabolic and toxin-induced cirrhosis models.

Conclusions:

• Glycogen depletion is an early indicator of liver injury in cirrhosis, independent of the etiological cause.
• Increased nucleic acid content suggests heightened cellular proliferation and polyploidy in response to liver damage.
• FTIR spectral histology provides a valuable tool for analyzing molecular changes during cirrhosis progression.