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13C-Isotope Tracing Structural Lipidomics for Resolving Phospholipid Metabolism Dynamics in Human Breast Cancer Cells
Zhuoning Xie1, Qirui Yu1, Simin Cheng2
1State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China.
Analytical Chemistry
|January 9, 2026
Summary
This study reveals how phospholipid synthesis is regulated at a structural level using isotope tracing. Cancer cells show distinct phospholipid metabolism dynamics, offering potential therapeutic targets.
Area of Science:
- Biochemistry
- Metabolomics
- Cell Biology
Background:
- Phospholipid metabolic homeostasis is crucial but poorly understood at the structural level.
- Metabolic flux analysis offers a pathway to investigate de novo phospholipid synthesis dynamics.
Purpose of the Study:
- To comprehensively investigate de novo phospholipid synthesis using an integrated RPLC-PB-MS/MS workflow.
- To reveal the dynamic regulation of phospholipid metabolism at the structural component level.
Main Methods:
- Integration of 13C-glucose isotope tracing with RPLC-PB-MS/MS.
- Precise mapping of 13C labeling sites within phospholipid structures.
- Analysis of phospholipid metabolism in three human breast cancer cell lines.
Main Results:
- Distinct metabolic rates were identified for glycerol backbone and acyl chains (SFAs vs. MUFAs).
- Labeling rates of phospholipid C═C location isomers highlighted dynamic regulation, with rapid turnover in certain n-7 isomers.
- Significant differences in phospholipid metabolism dynamics were observed across MCF-7, MDA-MB-468, and BT-474 cell lines.
Conclusions:
- The study provides insights into the structural specificity and dynamic regulation of phospholipid metabolism.
- Findings suggest potential functional roles for specific phospholipid isomers in membrane remodeling or signaling.
- Observed differences in cancer cell lines offer potential therapeutic implications for targeting phospholipid metabolism.
