Microfluidics separation reveals the stem-cell-like deformability of tumor-initiating cells

Weijia Zhang, Kazuharu Kai, Dong Soon Choi, Takayuki Iwamoto, Yen H. Nguyen, Helen Wong, Melissa D. Landis, Naoto T. Ueno, Jenny Chang, Lidong Qin

Research output: Contribution to journalArticlepeer-review

177 Scopus citations


Here we report a microfluidics method to enrich physically deformable cells by mechanical manipulation through artificial microbarriers. Driven by hydrodynamic forces, flexible cells or cells with high metastatic propensity change shape to pass through the microbarriers and exit the separation device, whereas stiff cells remain trapped. We demonstrate the separation of (i) a mixture of two breast cancer cell types (MDA-MB-436 and MCF-7) with distinct deformabilities and metastatic potentials, and (ii) a heterogeneous breast cancer cell line (SUM149), into enriched flexible and stiff subpopulations. We show that the flexible phenotype is associatedwith overexpression of multiple genes involved in cancer cellmotility and metastasis, and greater mammosphere formation efficiency. Our observations support the relationship between tumor-initiating capacity and cell deformability, and demonstrate that tumor-initiating cells are less differentiated in terms of cell biomechanics.

Original languageEnglish (US)
Pages (from-to)18707-18712
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number46
StatePublished - Nov 13 2012


  • Cell mechanics
  • Cytoskeleton
  • Genomic profiling

ASJC Scopus subject areas

  • General


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