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• W2023118532 abstract "Reactive oxygen species (ROS) cause oxidative stress and act as signal transduction molecules in many cells. Spermatozoa from several mammals generate ROS, which are involved in male infertility and signaling during capacitation. In the present study, we investigated ROS generation by sea urchin spermatozoa at the initiation of motility, during dilution with seawater, and following egg jelly treatment. In seawater containing an ROS indicator, 5-(and 6-)chloromethyl-2',7'-dichlorodihydrofluorescein diacetate (CM-H(2)DCFDA), fluorescence increased after the addition of spermatozoa. The ROS generation rate was dependent upon the dilution ratio and respiratory rate of the spermatozoa. Spermatozoa in sodium-free seawater did not increase fluorescence, but fluorescence did increase with the addition of NaCl. Sodium chloride also led to the initiation of sperm motility and respiration. Using the indicator MitoSOX Red, ROS generation was detected from spermatozoa exposed to egg jelly dissolved in seawater, but not in normal seawater. Moreover, the respiratory inhibitor antimycin A prevented CM-H(2)DCFDA-detectable ROS and increased MitoSox-detectable ROS at a higher concentration. These findings revealed that the ROS generated were of different species, possibly hydrogen peroxide (H(2)O(2)) and superoxide anion (O(-)(2)), and their detected levels were altered by egg jelly. We concluded that sea urchin spermatozoa generate at least two species of ROS depending on the physiological conditions to which they are exposed. It is possible that the major ROS from sea urchin spermatozoa changes during the course of fertilization." @default.
• W2023118532 created "2016-06-24" @default.
• W2023118532 creator A5060288767 @default.
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• W2023118532 date "2012-02-10" @default.
• W2023118532 modified "2023-09-24" @default.
• W2023118532 title "Sea urchin spermatozoa generate at least two reactive oxygen species; the type of reactive oxygen species changes under different conditions" @default.
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• W2023118532 doi "https://doi.org/10.1002/mrd.22025" @default.
• W2023118532 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22328344" @default.
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