Stable Isotope-Assisted Untargeted Metabolomics Identifies ALDH1A1-Driven Erythronate Accumulation in Lung Cancer...

Area of Science:

• Metabolomics
• Cancer Biology
• Biochemistry

Background:

• Erythronate is a known detoxification product of altered glycolysis.
• Its precise metabolic origins in cancer remain unclear.

Purpose of the Study:

• To identify the metabolic pathway leading to erythronate accumulation in cancer cells.
• To investigate the role of aldehyde dehydrogenase 1A1 (ALDH1A1) in erythronate production.
• To assess the potential of erythronate as a cancer biomarker.

Main Methods:

• Untargeted stable isotope-assisted metabolomics.
• Chemical inhibition and genetic silencing of metabolic pathways.
• Enzyme assays, proteomics, and Western blotting.
• Analysis of patient tumor tissues.

Main Results:

• Erythronate accumulates in human cancer cell lines.
• Erythrose 4-phosphate (E4P) is a precursor, with ALDH1A1 identified as the key enzyme for erythrose oxidation.
• A novel pathway involving E4P dephosphorylation and ALDH1A1-mediated oxidation is proposed.
• Elevated erythronate levels are observed in lung cancer tumors compared to normal tissues.

Conclusions:

• Erythronate accumulation represents metabolic reprogramming in cancer.
• ALDH1A1 plays a critical role in this process.
• Erythronate shows potential as a biomarker for certain cancers.