title: Multifunctional Magnetic Particles for Combined Circulating Tumor Cells Isolation and Cellular Metabolism Detection.
abstract: We for the first time demonstrate multi-functional magnetic particles based rare cell isolation combined with the downstream laser desorption/ionization mass spectrometry (LDI-MS) to measure the metabolism of enriched circulating tumor cells (CTCs). The characterization of CTCs metabolism plays a significant role in understanding the tumor microenvironment, through exploring the diverse cellular process. However, characterizing cell metabolism is still challenging due to the low detection sensitivity, high sample complexity, and tedious preparation procedures, particularly for rare cells analysis in clinical study. Here we conjugate ferric oxide magnetic particles with anti-EpCAM on the surface for specific, efficient enrichment of CTCs from PBS and whole blood with cells concentration of 6-100 cells per mL. Moreover, these hydrophilic particles as matrix enable sensitive and selective LDI-MS detection of small metabolites (MW<500 Da) in complex bio-mixtures and can be further coupled with isotopic quantification to monitor selected molecules metabolism of ~50 CTCs. Our unique approach couples the immunomagnetic separation of CTCs and LDI-MS based metabolic analysis, which represents a key step forward for downstream metabolites analysis of rare cells to investigate the biological features of CTCs and their cellular responses in both pathological and physiological phenomena.
authors.affiliation: Center for Bio-Nano-Chips and Diagnostics in Translational Medicine (CBD ), School of Biomedical Engineering, Med-X Research Institute and Shanghai Chest Hospital, Shanghai Jiao Tong University, Shanghai 200030, China.
authors.forename: Jiao
authors.initials: J
authors.lastname: Wu
authors.affiliation: Center for Bio-Nano-Chips and Diagnostics in Translational Medicine (CBD ), School of Biomedical Engineering, Med-X Research Institute and Shanghai Chest Hospital, Shanghai Jiao Tong University, Shanghai 200030, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Wei
authors.affiliation: Department of Chemistry, Institute of Biomedical Sciences and State Key Lab of Molecular Engineering of Polymers, Fudan University, Shanghai 200433, China.
authors.forename: Jinrui
authors.initials: J
authors.lastname: Gan
authors.affiliation: Center for Bio-Nano-Chips and Diagnostics in Translational Medicine (CBD ), School of Biomedical Engineering, Med-X Research Institute and Shanghai Chest Hospital, Shanghai Jiao Tong University, Shanghai 200030, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Huang
authors.affiliation: NanoLite Systems, Austin, TX 78795, USA.
authors.forename: Ting
authors.initials: T
authors.lastname: Shen
authors.affiliation: Center for Bio-Nano-Chips and Diagnostics in Translational Medicine (CBD ), School of Biomedical Engineering, Med-X Research Institute and Shanghai Chest Hospital, Shanghai Jiao Tong University, Shanghai 200030, China.
authors.forename: Jiatao
authors.initials: J
authors.lastname: Lou
authors.affiliation: Department of Chemistry, Institute of Biomedical Sciences and State Key Lab of Molecular Engineering of Polymers, Fudan University, Shanghai 200433, China.
authors.forename: Baohong
authors.initials: B
authors.lastname: Liu
authors.affiliation: Thayer School of Engineering, Dartmouth College, NH 03755, USA.
authors.forename: John X J
authors.initials: JX
authors.lastname: Zhang
authors.affiliation: Center for Bio-Nano-Chips and Diagnostics in Translational Medicine (CBD ), School of Biomedical Engineering, Med-X Research Institute and Shanghai Chest Hospital, Shanghai Jiao Tong University, Shanghai 200030, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Qian
keywords: circulating tumor cells (CTCs); laser desorption/ionization mass spectrometry; magnetic particles; small metabolites; surface conjugation