Significant decrease of saturation index in erythrocytes membrane from subjects with non-alcoholic fatty liver...

Area of Science:

• Biochemistry
• Metabolomics
• Hepatology

Background:

• Erythrocyte membrane lipidomics offers insights into metabolic pathways affecting lipid balance and homeostasis.
• Cellular lipid accumulation is linked to tissue inflammation, making it crucial to study in liver disease.
• Non-Alcoholic Fatty Liver Disease (NAFLD) involves lipid accumulation in the liver, necessitating research into associated molecular changes.

Purpose of the Study:

• To analyze the fatty acid profile in red blood cell membranes of NAFLD patients.
• To identify and validate membrane lipid profiles associated with the severity of hepatic damage in NAFLD.
• To explore the diagnostic potential of erythrocyte membrane lipidomics in NAFLD staging.

Main Methods:

• A nutritional trial involving 101 consecutive NAFLD patients.
• Diagnosis of liver steatosis confirmed using vibration-controlled elastography (FibroScan).
• Gas chromatography quantification of fatty acids extracted from erythrocyte membrane phospholipids.

Main Results:

• Severe NAFLD patients exhibited a significantly lower stearic acid to oleic acid ratio (Saturation Index, SI) compared to controls (1.28 ± 0.31 vs. 1.5 ± 0.29).
• Lower red blood cell membrane SI was inversely associated with the degree of liver damage, suggesting impaired membrane structure reflects liver modifications.
• Severe NAFLD patients displayed higher elongase 5 activity, indicated by an increased vaccenic acid to palmitoleic acid ratio.

Conclusions:

• Lipidomic analysis of erythrocyte membranes provides valuable data for NAFLD diagnosis.
• The findings highlight the importance of erythrocyte membrane lipid profiles in staging NAFLD.
• This approach may offer a non-invasive method to assess liver health and disease progression.