Abstract
5-HT3 receptor antagonists are extensively used as efficacious agents in counteracting chemotherapy-induced emesis. Recent investigations have shed light on other potential effects (analgesic, anxiolytic, and anti-psychotic). Some studies have reported neuroprotective properties for the 5-HT3 receptor antagonists in vitro and in vivo. When administered to Aβ-challenged rat cortical neurons, 5-HT3 receptor antagonists substantially abated apoptosis, elevation of cytosolic Ca2, glutamate release, reactive oxygen species (ROS) generation, and caspase-3 activity. In addition, in vivo studies show that 5-HT3 receptor antagonists possess, alongside their anti-emetic effects, notable immunomodulatory properties in CNS. We found that pretreatment with tropisetron significantly improved neurological deficits and diminished leukocyte transmigration into the brain, TNF-α level, and brain infarction in a murine model of embolic stroke. Our recent investigation revealed that tropisetron protects against Aβ-induced neurotoxicity in vivo through both 5-HT3 receptor-dependent and -independent pathways. Tropisetron, in vitro, was found to be an efficacious inhibitor of the signaling pathway leading to the activation of pro-inflammatory NF-κB, a transcription factor pivotal to the upregulation of several neuroinflammatory mediators in brain. This mini review summarizes novel evidence concerning effects of 5-HT3 antagonists and their possible mechanisms of action in ameliorating neurodegenerative diseases including Alzheimer, multiple sclerosis, and stroke. Further, we discuss some newly synthesized 5-HT3 receptor antagonists with dual properties of 5-HT3 receptor blockade/alpha-7 nicotinic receptor activator and their potential in management of memory impairment. Since 5-HT3 receptor antagonists possess a large therapeutic window, they can constitute a scaffold for design and synthesis of new neuroprotective medications.
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Abbreviations
- 5-HT:
-
5-Hydroxytryptamine
- Abeta42:
-
Amyloid beta42
- Ach:
-
Acetylcholine
- AChE:
-
Acetylcholinesterase
- AD:
-
Alzheimer’s disease
- Aβ:
-
Amyloid-β
- CB1 :
-
Cannabinoid type one
- CGNs:
-
Cerebellar granule cells
- CNS:
-
Central nervous system
- COX-2:
-
Cyclooxygenase-2
- EAE:
-
Experimental autoimmune encephalomyelitis
- iNOS:
-
Inducible nitric oxide synthase
- MAPK:
-
Mitogen-activated kinase
- mCPBG:
-
Meta-chlorophenylbiguanide
- MLA:
-
Methyllycaconitine citrate
- MS:
-
Multiple sclerosis
- MWM:
-
Morris Water Maze
- NF-kB:
-
Nuclear factor-kappa B
- OA:
-
Activated osteoarthritis
- RA:
-
Rheumatoid arthritis
- ROS:
-
Reactive oxygen species
- TNF-α:
-
Tumor necrosis factor-alpha
- α7nAchR:
-
Alpha7 nicotinic acetylcholine receptor
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Fakhfouri, G., Mousavizadeh, K., Mehr, S.E. et al. From Chemotherapy-Induced Emesis to Neuroprotection: Therapeutic Opportunities for 5-HT3 Receptor Antagonists. Mol Neurobiol 52, 1670–1679 (2015). https://doi.org/10.1007/s12035-014-8957-5
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DOI: https://doi.org/10.1007/s12035-014-8957-5