Analysis of dichlorodihydrofluorescein and dihydrocalcein as probes for the detection of intracellular reactive oxygen species.

Abstract:

:Dihydrocalcein (H2-calcein) is recommended as a superior probe for intracellular radical (ROS) detection as different to dichlorodihydrofluorescein (H2-DCF), its oxidation product calcein is thought not to leak out of cells. We determined whether H2-calcein is a useful tool to measure ROS in vascular smooth muscle cells. In vitro, both compounds were oxidized by peroxynitrite, hydroxyl radicals and peroxidase, but not hydrogen peroxide or nitric oxide. The intracellular half-life of calcein was several hours whereas that of DCF was approximately 5 min. Intracellular ROS, as generated by the angiotensin II (Ang II)-activated NADPH oxidase, did not increase the oxidation of H2-calcein but increased the oxidation of H2-DCF by approximately 50%. Similar changes were detected using electron spin resonance spectroscopy. Inhibition of the NADPH oxidase using gp91ds-tat prevented the Ang II-induced increase in DCF fluorescence, without affecting cells loaded with H2-calcein. Diphenylene iodonium (DPI), which inhibits all flavin-dependent enzymes, including those in the respiratory chain, had little effect on the basal but prevented the Ang II-induced oxidation of H2-DCF. In contrast, DPI inhibited H2-calcein oxidation in non-stimulated cells by almost 50%. Blockade of respiratory chain complex I inhibited H2-calcein oxidation, whereas inhibitors of complex III were without effect. Calcein accumulated in the mitochondria, whereas DCF was localized in the cytoplasm. In submitochondrial particles, H2-calcein, but not H2-DCF inhibited complex I activity. These observations indicate that H2-DCF is an indicator for intracellular ROS, whereas the oxidation of H2-calcein most likely occurs as a consequence of direct electron transfer to mitochondrial complex I.

journal_name

Free Radic Res

journal_title

Free radical research

authors

Keller A,Mohamed A,Dröse S,Brandt U,Fleming I,Brandes RP

doi

10.1080/10715760400022145

keywords:

subject

Has Abstract

pub_date

2004-12-01 00:00:00

pages

1257-67

issue

12

eissn

1071-5762

issn

1029-2470

pii

Q3XF95U7FPKKVML2

journal_volume

38

pub_type

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