Adaphostin and other anticancer drugs quench the fluorescence of mitochondrial potential probes

S. B. Le, E. L. Holmuhamedov, V. L. Narayanan, E. A. Sausville, Scott H Kaufmann

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Fluorescent dyes are widely used to monitor changes in mitochondrial transmembrane potential (ΔΨm). When MitoTracker Red CMXRos, tetramethylrhodamine methyl ester (TMRM), and 3,3′dihexyloxacarbocyanine iodide (DiOC6(3)) were utilized to examine the effects of the experimental anticancer drug adaphostin on intact cells or isolated mitochondria, decreased fluorescence was observed. In contrast, measurement of tetraphenylphosphonium uptake by the mitochondria using an ion-selective microelectrode failed to show any effect of adaphostin on ΔΨm. Instead, further experiments demonstrated that adaphostin quenches the fluorescence of the mitochondrial dyes. Structure-activity analysis revealed that the adamantyl and p-aminobenzoic acid moieties of adaphostin are critical for this quenching. Anticancer drugs containing comparable structural motifs, including mitoxantrone, aminoflavone, and amsacrine, also quenched the mitochondrial probes. These results indicate the need for caution when mitochondrial dyes are utilized to examine the effects of xenobiotics on ΔΨm and suggest that some previously reported direct effects of anticancer drugs on mitochondria might need re-evaluation.

Original languageEnglish (US)
Pages (from-to)151-159
Number of pages9
JournalCell Death and Differentiation
Volume13
Issue number1
DOIs
StatePublished - Jan 2006

Fingerprint

NSC 680410
Fluorescence
Mitochondria
aminoflavone
Pharmaceutical Preparations
Coloring Agents
Amsacrine
4-Aminobenzoic Acid
Mitoxantrone
Iodides
Microelectrodes
Xenobiotics
Fluorescent Dyes
Membrane Potentials
Ions

Keywords

  • Chemotherapy
  • Fluorescence
  • Mitochondrial membrane potential
  • Probe
  • Quenching

ASJC Scopus subject areas

  • Cell Biology

Cite this

Adaphostin and other anticancer drugs quench the fluorescence of mitochondrial potential probes. / Le, S. B.; Holmuhamedov, E. L.; Narayanan, V. L.; Sausville, E. A.; Kaufmann, Scott H.

In: Cell Death and Differentiation, Vol. 13, No. 1, 01.2006, p. 151-159.

Research output: Contribution to journalArticle

Le, S. B. ; Holmuhamedov, E. L. ; Narayanan, V. L. ; Sausville, E. A. ; Kaufmann, Scott H. / Adaphostin and other anticancer drugs quench the fluorescence of mitochondrial potential probes. In: Cell Death and Differentiation. 2006 ; Vol. 13, No. 1. pp. 151-159.
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