High-throughput measurements of the optical redox ratio using a commercial microplate reader

Taylor M. Cannon, Amy T. Shah, Alex J. Walsh, Melissa C. Skala

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

There is a need for accurate, high-throughput, functional measures to gauge the efficacy of potential drugs in living cells. As an early marker of drug response in cells, cellular metabolism provides an attractive platform for high-throughput drug testing. Optical techniques can noninvasively monitor NADH and FAD, two autofluorescent metabolic coenzymes. The autofluorescent redox ratio, defined as the autofluorescence intensity of NADH divided by that of FAD, quantifies relative rates of cellular glycolysis and oxidative phosphorylation. However, current microscopy methods for redox ratio quantification are time-intensive and low-throughput, limiting their practicality in drug screening. Alternatively, high-throughput commercial microplate readers quickly measure fluorescence intensities for hundreds of wells. This study found that a commercial microplate reader can differentiate the receptor status of breast cancer cell lines (p 0.05) based on redox ratio measurements without extrinsic contrast agents. Furthermore, microplate reader redox ratio measurements resolve response (p 0.05) and lack of response (p 0.05) in cell lines that are responsive and nonresponsive, respectively, to the breast cancer drug trastuzumab. These studies indicate that the microplate readers can be used to measure the redox ratio in a high-throughput manner and are sensitive enough to detect differences in cellular metabolism that are consistent with microscopy results.

Original languageEnglish (US)
Article number010503
JournalJournal of Biomedical Optics
Volume20
Issue number1
DOIs
StatePublished - Jan 1 2015

Keywords

  • breast cancer
  • drug screening
  • fluorescence
  • Herceptin
  • microplate reader
  • redox ratio

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering

Fingerprint Dive into the research topics of 'High-throughput measurements of the optical redox ratio using a commercial microplate reader'. Together they form a unique fingerprint.

Cite this