Abstract
Mitochondria are the main source of reactive oxygen species (ROS). The aim of this work was to verify the ROS generation in situ in HeLa cells exposed to prooxidants and antioxidants (menadione, tert-butyl hydroperoxide, antimycin A, vitamin E, N-acetyl-l-cysteine, and butylated hydroxytoluene) using the ROS-sensitive probes 6-carboxy-2′,7′-dichlorodihydrofluorescein diacetate di-acetomethyl ester (DCDHF) and dihydrofluorescein diacetate (DHF). Mitochondria were counterstained with the potential-sensitive probe tetramethylrhodamine methyl ester perchlorate (TMRM). Both DCDHF and DHF were able to detect the presence of ROS in mitochondria, though with distinct morphological features. DCDHF fluorescence was invariably blurred, smudged, and spread over the cytoplasm surrounding the major mitochondrial clusters. On the contrary, DHF fluorescence was sharp and delineated thin filaments which corresponded in all details to TMRM-stained mitochondria. These data suggest that DCDHF does not reach the mitochondrial matrix but is oxidized by ROS released by mitochondria in the cytosol. On the other hand, DHF enters mitochondria and reacts with ROS released in the matrix. Cytosolic (DCDHF+) ROS but not matrix (DHF+) ROS, were significantly decreased by vitamin E. N-acetyl-l-cysteine was effective in reducing DCDHF and DHF photooxidation in the medium, but was unable to reduce intracellular ROS. ROS generation was accompanied by partial mitochondrial depolarization.
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Acknowledgements
The research was supported by grants from MIUR-FIRB (RBAU01CCAJ_003), Istituto Zooprofilattico Sperimentale della Sardegna (IZS SA/001/2001), and Regione Autonoma della Sardegna, Assessorato dell'Igiene e Sanità e dell'Assistenza Sociale.
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Diaz, G., Liu, S., Isola, R. et al. Mitochondrial localization of reactive oxygen species by dihydrofluorescein probes. Histochem Cell Biol 120, 319–325 (2003). https://doi.org/10.1007/s00418-003-0566-8
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DOI: https://doi.org/10.1007/s00418-003-0566-8