The selective serotonin reuptake inhibitor (SSRI) fluoxetine (FLX), the active ingredient of the antidepressant drug Prozac, inhibits reuptake of the neurotransmitter, serotonin (5-HT; 5-hydroxytryptamine), into cells by the 5-HT transporter (SERT). Given the role of 5-HT in oxygen detection and the cardiovascular and ventilatory responses of fish to hypoxia, we hypothesized that treatment of the Gulf toadfish, Opsanus beta, with FLX would interfere with their response to hypoxia. Toadfish treated intra-arterially with 3.4 μg.g(-1) FLX under normoxic conditions displayed a transient tachycardia and a biphasic caudal arterial blood pressure (PCA) response that are in direct conflict with the typical hypoxia response. Fish injected intraperitoneally with FLX under normoxia had resting cardiovascular and ventilatory parameters similar to controls. Upon exposure to hypoxia, control toadfish exhibit a significant bradycardia, reduction in PCA and an increase in ventilatory amplitude (VAMP) without any changes in ventilatory frequency (fV). Fish treated IP with 10 μg.g(-1) FLX showed an interference in the cardiovascular and ventilatory response to hypoxia. Interestingly, when treated with 25 μg.g(-1) FLX, the bradycardia and VAMP response to hypoxia were similar to control fish while the PCA response to hypoxia was further inhibited. These results suggest that SERT inhibition by FLX may hinder survival in hypoxia.
This research output has an Altmetric Attention Score of 7. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 21 July 2016.
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