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Abstract

Volume 22, Issue 5 (September 2020) 22, 465–471; 10.4103/aja.aja_132_19

Fluorescent probes for the detection of reactive oxygen species in human spermatozoa

Sara Escada-Rebelo1,2,3, Francisca G Mora2, Ana P Sousa2,4, Teresa Almeida-Santos2,4,5, Artur Paiva6, João Ramalho-Santos2,7

1 PhD Programme in Experimental Biology and Biomedicine, CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra 3004-504, Portugal
2 Biology of Reproduction and Stem Cell Group, CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra 3004-504, Portugal
3 IIIUC - Institute for Interdisciplinary Research, Casa Costa Alemão, University of Coimbra, Coimbra 3030-789, Portugal
4 Reproductive Medicine Unit, University Hospitals of Coimbra, Coimbra 3004-561, Portugal
5 Faculty of Medicine, University of Coimbra, Coimbra 3000-370, Portugal
6 Clinical Pathology Unit, University Hospitals of Coimbra, Coimbra 3004-561, Portugal
7 Department of Life Sciences, University of Coimbra, Coimbra 3000-456, Portugal

Correspondence: Dr. J Ramalho-Santos (jramalho@uc.pt)

Date of Submission 09-Jun-2019 Date of Acceptance 10-Sep-2019 Date of Web Publication 14-Jan-2020

Abstract

Reactive oxygen species (ROS) production is a by-product of mitochondrial activity and is necessary for the acquisition of the capacitated state, a requirement for functional spermatozoa. However, an increase in oxidative stress, due to an abnormal production of ROS, has been shown to be related to loss of sperm function, highlighting the importance of an accurate detection of sperm ROS, given the specific nature of this cell. In this work, we tested a variety of commercially available fluorescent probes to detect ROS and reactive nitrogen species (RNS) in human sperm, to define their specificity. Using both flow cytometry (FC) and fluorescence microscopy (FM), we confirmed that MitoSOX™ Red and dihydroethidium (DHE) detect superoxide anion (as determined using antimycin A as a positive control), while DAF-2A detects reactive nitrogen species (namely, nitric oxide). For the first time, we also report that RedoxSensor™ Red CC-1, CellROX® Orange Reagent, and MitoPY1 seem to be mostly sensitive to hydrogen peroxide, but not superoxide. Furthermore, mean fluorescence intensity (and not percentage of labeled cells) is the main parameter that can be reproducibly monitored using this type of methodology.

Keywords: flow cytometry; fluorescent probes; human spermatozoa; oxidative stress; reactive oxygen species

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