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Microfluidic device coupled with a microfabricated oxygen electrode for the measurement of bactericidal activity of neutrophil-like cells.
Analytica Chimica Acta 2017 September 9
A microfluidic device coupled with a microfabricated Clark-type oxygen electrode was used to measure the bactericidal activity of neutrophil-like cells differentiated from HL-60 cells. The neutrophil-like cells and Escherichia coli (E. coli) cells were cultured in the same medium, which was introduced into the flow channel of the device. Changes in the respiratory activity of E. coli were measured as changes in the consumption of dissolved oxygen. As the activity of the neutrophil-like cells increased, the rate of elimination of E. coli increased. The accompanying decrease in the number of E. coli reduced the consumption of dissolved oxygen. The changes were actually observed as changes in generated current. A distinct difference in changes in dissolved oxygen concentrations was observed between E. coli cells co-incubated with IFN-γ-activated or non-activated neutrophil-like cells. The required sample volume was less than 10 μL, and results could be obtained within 1-2 h. The device may be useful for the assessment of psychological stresses that affect the activity of neutrophils.
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