A microfluidic device enabling drug resistance analysis of leukemia cells via coupled dielectrophoretic detection and impedimetric counting

Sci Rep. 2021 Jun 23;11(1):13193. doi: 10.1038/s41598-021-92647-5.

Abstract

We report the development of a lab-on-a-chip system, that facilitates coupled dielectrophoretic detection (DEP-D) and impedimetric counting (IM-C), for investigating drug resistance in K562 and CCRF-CEM leukemia cells without (immuno) labeling. Two IM-C units were placed upstream and downstream of the DEP-D unit for enumeration, respectively, before and after the cells were treated in DEP-D unit, where the difference in cell count gave the total number of trapped cells based on their DEP characteristics. Conductivity of the running buffer was matched the conductivity of cytoplasm of wild type K562 and CCRF-CEM cells. Results showed that DEP responses of drug resistant and wild type K562 cells were statistically discriminative (at p = 0.05 level) at 200 mS/m buffer conductivity and at 8.6 MHz working frequency of DEP-D unit. For CCRF-CEM cells, conductivity and frequency values were 160 mS/m and 6.2 MHz, respectively. Our approach enabled discrimination of resistant cells in a group by setting up a threshold provided by the conductivity of running buffer. Subsequent selection of drug resistant cells can be applied to investigate variations in gene expressions and occurrence of mutations related to drug resistance.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Buffers
  • Cell Line, Tumor
  • Drug Resistance, Neoplasm*
  • Electric Conductivity
  • Electric Impedance
  • Electrophoresis, Microchip / instrumentation
  • Electrophoresis, Microchip / methods
  • Equipment Design
  • Humans
  • Inhibitory Concentration 50
  • K562 Cells
  • Lab-On-A-Chip Devices*
  • Leukemia, Myelogenous, Chronic, BCR-ABL Positive / pathology
  • Microfluidic Analytical Techniques / instrumentation
  • Microfluidic Analytical Techniques / methods*
  • Precursor Cell Lymphoblastic Leukemia-Lymphoma / pathology

Substances

  • Buffers