Hybrid Microfluidic Device for High Throughput Isolation of Cells Using Aptamer Functionalized Diatom Frustules

Authors

  • Rashin Mohammadi Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich, Department of Nanobiotechnology/Biophysics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran
  • Mohammad Asghari Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich https://orcid.org/0000-0002-2151-5738
  • Monika Colombo Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich https://orcid.org/0000-0002-6658-4438
  • Zahra Vaezi Department of Bioactive Compounds, Faculty of Interdisciplinary Science and Technology, Tarbiat Modares University, Tehran https://orcid.org/0000-0001-8292-3156
  • Daniel Richards Department of Chemistry and Applied Biochemistry, ETH Zurich, Zurich https://orcid.org/0000-0001-8827-9170
  • Stavros Stavrakis Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich
  • Hossein Naderi-Manesh Department of Nanobiotechnology/Biophysics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran https://orcid.org/0000-0002-4227-171X
  • Andrew deMello Department of Chemistry and Applied Biosciences, ETH Zürich, Zurich

DOI:

https://doi.org/10.2533/chimia.2022.661

Keywords:

Circulating tumor cells, Diagnostics, Microfluidic platform

Abstract

Circulating tumor cells (CTCs), secreted from primary and metastatic malignancies, hold a wealth of essential diagnostic and prognostic data for multiple cancers. Significantly, the information contained within these cells may hold the key to understanding cancer metastasis, both individually and fundamentally. Accordingly, developing ways to identify, isolate and interrogate CTCs plays an essential role in modern cancer research. Unfortunately, CTCs are typically present in the blood in vanishingly low titers and mixed with other blood components, making their isolation and analysis extremely challenging. Herein, we report the design, fabrication and optimization of a microfluidic device capable of automatically isolating CTCs from whole blood. This is achieved in two steps, via the passive viscoelastic separation of CTCs and white blood cells (WBCs) from red blood cells (RBCs), and subsequent active magnetophoretic separation of CTCs from WBCs. We detail the specific geometries required to balance the elastic and inertial forces required for successful passive separation of RBCs, and the use of computational fluid dynamics (CFD) to optimize active magnetophoretic separation. We subsequently describe the use of magnetic biosilica frustules, extracted from Chaetoceros sp. diatoms, to fluorescently tag CTCs and facilitate magnetic isolation. Finally, we use our microfluidic platform to separate HepG2-derived CTCs from whole blood, demonstrating exceptional CTC recovery (94.6%) and purity (89.7%)

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Published

2022-08-24

How to Cite

[1]
R. Mohammadi, M. Asghari, M. Colombo, Z. Vaezi, D. Richards, S. Stavrakis, H. Naderi-Manesh, A. deMello, Chimia 2022, 76, 661, DOI: 10.2533/chimia.2022.661.