Urinary metabonomic study on colorectal cancer.

Area of Science:

• Metabolomics
• Oncology
• Biochemistry

Background:

• Colorectal cancer (CRC) is a significant global health concern.
• Serum metabonomics has previously been explored for CRC detection.
• Understanding urine metabolic profiles offers complementary insights into CRC pathogenesis.

Purpose of the Study:

• To profile urine metabolites in CRC patients and a chemically induced rat model.
• To identify metabolic alterations associated with colorectal cancer and its surgical treatment.
• To complement existing serum and tissue metabonomic data for a comprehensive understanding of CRC metabolism.

Main Methods:

• Gas chromatography-mass spectrometry (GC-MS) coupled with multivariate statistical analysis (OPLS-DA).
• Metabonomic profiling of urine from CRC patients (pre- and post-surgery) and healthy controls.
• Parallel study using a 1,2-dimethylhydrazine (DMH)-induced rat model of colorectal lesions.

Main Results:

• Distinct urine metabolic profiles separated CRC patients and model rats from healthy controls.
• Increased tryptophan metabolism, disturbed tricarboxylic acid (TCA) cycle, and altered gut microflora metabolism were common in CRC patients and rats.
• Post-surgery, urine profiles showed down-regulated gut microflora and TCA cycle metabolism, with decreased 5-hydroxytryptophan, suggesting recovery.
• Abnormal histamine, glutamate, and polyamine metabolism were identified in specific groups.

Conclusions:

• Urine metabonomics effectively distinguishes colorectal cancer patients and models.
• Metabolic disturbances in tryptophan, TCA cycle, and gut microflora are hallmarks of CRC.
• Post-surgical metabolic changes indicate a potential return towards a healthy metabolic state.
• Urine metabonomics provides valuable data for elucidating CRC's underlying metabolic mechanisms.