Dielectrophoretic characterization of antibiotic-treated Mycobacterium tuberculosis complex cells.

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Dielectrophoretic characterization of antibiotic-treated Mycobacterium tuberculosis complex cells.

Anal Bioanal Chem. 2015 Aug 1;

Authors: Inoue S, Lee HB, Becker AL, Weigel KM, Kim JH, Lee KH, Cangelosi GA, Chung JH

Abstract
Multi-drug resistant tuberculosis (MDR-TB) has become a serious concern for proper treatment of patients. As a phenotypic method, dielectrophoresis can be useful but is yet to be attempted to evaluate Mycobacterium tuberculosis complex cells. This paper investigates the dielectrophoretic behavior of Mycobacterium bovis (Bacillus Calmette-Guérin, BCG) cells that are treated with heat or antibiotics rifampin (RIF) or isoniazid (INH). The experimental parameters are designed on the basis of our sensitivity analysis. The medium conductivity (σ m) and the frequency (f) for a crossover frequency (f xo1) test are decided to detect the change of σ m-f xo1 in conjunction with the drug mechanism. Statistical modeling is conducted to estimate the distributions of viable and nonviable cells from the discrete measurement of f xo1. Finally, the parameters of the electrophysiology of BCG cells, C envelope and σ cyto, are extracted through a sampling algorithm. This is the first evaluation of the dielectrophoresis (DEP) approach as a means to assess the effects of antimicrobial drugs on M. tuberculosis complex cells.

PMID: 26231690 [PubMed - as supplied by publisher]