Metabolomic markers for intestinal ischemia in a mouse model

Area of Science:

• Biochemistry
• Metabolomics
• Medical Diagnostics

Background:

• Diagnosing intestinal ischemia is a significant clinical challenge.
• Identifying reliable biomarkers is crucial for early detection and management.
• Small molecules (<500 M(r)) in serum are potential candidates for diagnostic utility.

Purpose of the Study:

• To employ a metabolomic approach to identify serum small molecules that are upregulated or downregulated in a mouse model of intestinal ischemia.
• To assess the potential of these identified molecules as biomarkers for human intestinal ischemia studies.

Main Methods:

• Established and validated a mouse model of intestinal ischemia using histology and serum TNF-α levels.
• Collected serial serum samples from intestinal ischemia, peritoneal sepsis (positive control), and sham-operated mice.
• Analyzed serum samples using gas chromatography-mass spectrometry (GC-MS) and multivariate data analysis (PCA, OPLS-DA) to identify differential small molecules.

Main Results:

• Significantly upregulated serum molecules in intestinal ischemia included inorganic phosphate (2.4-fold), urea (4.3-fold), and threonic acid (2.9-fold).
• Significantly downregulated serum molecules included stearic acid (1.7-fold), arabinose (2.7-fold), xylose (1.6-fold), glucose (1.4-fold), and ribose (2.2-fold).
• Lactic acid levels remained unchanged in the intestinal ischemia group.

Conclusions:

• The study identified distinct molecular signatures in serum associated with intestinal ischemia, reflecting impaired gut microbiota metabolism, intestinal absorption, and renal function, along with increased oxidative stress.
• The observed changes in small molecules, particularly the lack of change in lactic acid, differentiate from previous findings.
• These identified molecular signatures warrant further evaluation as potential biomarkers in clinical studies for diagnosing intestinal ischemia.