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Redox metabolism modulation as a mechanism in SSRI toxicity and pharmacological effects

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Abstract

Depressive disorders are amongst the greatest mental health challenges, with an increasing number of patients being diagnosed each year. Though it has not yet been fully elucidated, redox metabolism imbalances and oxidative stress seem to play a major role in the pathogenesis of depressive disorders. Selective serotonin reuptake inhibitors (SSRIs) are the most prescribed antidepressants, considered to have a better tolerability. However, several adverse effects have been reported and the mechanisms involved in their pharmacological activity are not entirely understood. SSRIs have been shown to influence the redox metabolism, which could be involved in their toxicity and pharmacological effects. A comparative analysis of published in vivo and in vitro data regarding the activity of SSRIs on the redox metabolism pathways has been performed in this paper, with an emphasis on mechanistical aspects. Furthermore, a comparison between oxidative stress biomarker levels reported by different studies was attempted. The reviewed data point towards both pro- and antioxidant effects of SSRIs, dependent on tissue/cell type and dose/concentration, suggest a redox modulating potential of these compounds. In hepatic and testicular tissue, the majority of reviewed studies reported pro-oxidant effects, with possible implications towards the hepatotoxicity and sexual dysfunction that were reported following SSRI treatment; while in brain, the most common findings were antioxidant effects that could partially explain their antidepressant activity. However, given the heterogeneity of the reviewed data, further research is needed to fully understand the impact of SSRIs on redox metabolism and its implications.

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Abbreviations

3-NP:

3-Nitropropionic acid

4-HNE:

4-Hydroxy-nonenal

5-HT:

Serotonin

5-HTT:

Serotonin transporter

8-oxo-dG:

8-Oxo-2-deoxyguanosine

ACR:

Acrolein

BDNF:

Brain-derived neurotrophic factor

CAT:

Catalase

CIS:

Chronic isolation stress

CIT:

Citalopram

CMS:

Chronic mild stress

CREB:

CAMP response element binding protein

CUS:

Chronic unpredictable stress

DA:

Dopamine

DNA:

Deoxyribonucleic acid

eNOS:

Endothelial nitric oxide synthase

ESC:

Escitalopram

FLX:

Fluoxetine

FST:

Forced-swim test

FVX:

Fluvoxamine

GPX:

Glutathione peroxidase

GR:

Glutathione reductase

GSH:

Reduced glutathione

GSSG:

Oxidized glutathione

GST:

Glutathione-sulfotransferase

H2O2 :

Hydrogen peroxide

HO·:

Hydroxyl

HO-1:

Hemoxygenase 1

HPA:

Hypothalamic–pituitary–adrenal

iNOS:

Inducible nitric oxide synthase

Keap1:

Kelch-like ECH-associated protein 1

LPS:

Lipopolysaccharide

MAOIs:

Monoamine oxidase inhibitors

MDA:

Malondialdehyde

MDD:

Major depressive disorder

MPO:

Myeloperoxidase

MPTP:

1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine

NA:

Noradrenaline

NEA:

Non-enzymatic antioxidants

nNOS:

Neuronal nitric oxide synthase

NO:

Nitric oxide

NOS:

Nitric oxide synthase

O2· :

Superoxide

OS:

Oxidative stress

PC:

Protein carbonyls

PRX:

Paroxetine

ROS:

Reactive oxygen species

RS:

Restraint stress

SNRIs:

Serotonin–noradrenaline reuptake

SOD:

Superoxide-dismutase

SRT:

Sertraline

SSRIs:

Selective serotonin reuptake inhibitors

StAR:

Steroidogenic acute regulatory protein

TAC:

Total antioxidant capacity

TAS:

Total antioxidant status

TCAs:

Tricyclic antidepressants

TST:

Tail suspension test

XO/XDH:

Xanthine oxidase/xanthine dehydrogenase

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Correspondence to Béla Kiss.

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Ștefan, MG., Kiss, B., Gutleb, A.C. et al. Redox metabolism modulation as a mechanism in SSRI toxicity and pharmacological effects. Arch Toxicol 94, 1417–1441 (2020). https://doi.org/10.1007/s00204-020-02721-6

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  • DOI: https://doi.org/10.1007/s00204-020-02721-6

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