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Selective cell capture and analysis using shallow antibody-coated microchannels.

Kihoon Jang1, Yo Tanaka, Jun Wakabayashi

  • 1Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan.

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A novel microchannel design enhances rare cell capture by utilizing cellular flexibility. This method enables efficient isolation and single-molecule analysis of circulating tumor cells for improved cancer diagnostics.

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Area of Science:

  • Biotechnology
  • Cell Biology
  • Medical Diagnostics

Background:

  • Analysis of rare cells, like circulating tumor cells (CTCs), at the single-molecule level is crucial for disease diagnosis and monitoring.
  • Existing cell separation methods using antibody-coated micropillars face limitations in capture efficiency due to reliance on random cell-micropillar collisions.

Purpose of the Study:

  • To develop a novel microfluidic system for efficient capture of rare cells by exploiting cellular flexibility.
  • To enable sensitive, in situ single-molecule analysis of captured cells, specifically targeting cancer markers.

Main Methods:

  • A microchannel with a depth slightly smaller than cell diameter was designed to ensure cell contact and exploit deformability for capture.
  • Antibodies against epithelial cell adhesion molecule (EpCAM) were used for specific capture of epithelial cells.
  • Rolling circle amplification (RCA) was employed for in situ single-molecule analysis and biomarker detection.

Main Results:

  • Demonstrated efficient capture of human promyelocytic leukemia (HL-60) cells and verified in situ single-molecule analysis using RCA.
  • Successfully captured breast cancer cells (SK-BR-3) from blood samples and detected the HER2 cancer marker via RCA.
  • Antibody-coated microchannels showed significantly higher capture rates for target cells compared to negative controls and non-coated channels.

Conclusions:

  • The developed microchannel system effectively captures rare cells by leveraging their flexibility, overcoming limitations of previous methods.
  • This technology facilitates sensitive detection and analysis of specific biomarkers in small numbers of target cells within complex biological samples.
  • The system holds promise for advancing diagnostics and research involving rare cell populations, such as circulating tumor cells.