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Involvement of α7 nAChR subtype in rat oxaliplatin-induced neuropathy: effects of selective activation.
- Source :
-
Neuropharmacology [Neuropharmacology] 2014 Apr; Vol. 79, pp. 37-48. Date of Electronic Publication: 2013 Nov 10. - Publication Year :
- 2014
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Abstract
- Oxaliplatin, unlike other platinum anticancer agents, has only mild toxic effects on the hematopoietic, urinary and gastrointestinal systems. Its dose-limiting side effect is neurotoxicity that may evolve to a neuropathic syndrome which is difficult to treat. In this study we treated rats with oxaliplatin (2.4 mg/kg/day intraperitoneally, for 3 weeks), and observed that expression levels of the α7 nicotinic acetylcholine receptor (nAChR) subunit were dramatically decreased both in the peripheral and central nervous system. The repeated administration (30 mg/kg/day per os, for 3 weeks) of (R)-ICH3, the most active enantiomer of a novel α7 nAChR agonist, and of PNU-282987 prevented the receptor down-regulation. On the other hand, both agonists per se up-regulated the α7 nAChR subunit compared to control. (R)-ICH3 and PNU-282987 significantly reduced oxaliplatin-dependent alterations of the pain threshold when noxious or non-noxious stimuli were used. Further ex vivo analysis highlighted their neuroprotective effects in dorsal root ganglia and peripheral nerves. The two agonists did not prevent the increase in microglia cell number induced by oxaliplatin in the central nervous system. Astrocyte density was enhanced by the agonist treatment in the spinal cord, thalamus and somatosensory area 1 as opposed to the effects of oxaliplatin treatment. (R)-ICH3 and PNU-282987 per se increased glial cell number in a region-specific manner. In summary, α7 nAChR is involved in oxaliplatin-dependent neuropathology and the agonists (R)-ICH3 and PNU-282987 reduce pain and protect nervous tissue with concomitant glial activation. Since glial cells play a role both in pain and in neuroprotection, an α7 AChR-dependent modulation of glial functions is suggested to distinguish rescue signals from the pathological pain-mediating pathway.<br /> (Copyright © 2013 Elsevier Ltd. All rights reserved.)
- Subjects :
- Animals
Astrocytes drug effects
Astrocytes physiology
Benzamides pharmacology
Bridged Bicyclo Compounds pharmacology
Ganglia, Spinal drug effects
Ganglia, Spinal physiopathology
Iodine Compounds pharmacology
Male
Microglia drug effects
Microglia physiology
Neuroprotective Agents pharmacology
Nicotinic Agonists pharmacology
Oxaliplatin
Pain Threshold drug effects
Peripheral Nerves drug effects
Peripheral Nerves physiopathology
Peripheral Nervous System Diseases physiopathology
Rats
Rats, Sprague-Dawley
Somatosensory Cortex drug effects
Somatosensory Cortex physiopathology
Stereoisomerism
Thalamus drug effects
Thalamus physiopathology
alpha7 Nicotinic Acetylcholine Receptor agonists
Antineoplastic Agents toxicity
Organoplatinum Compounds toxicity
Peripheral Nervous System Diseases chemically induced
Peripheral Nervous System Diseases metabolism
alpha7 Nicotinic Acetylcholine Receptor metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1873-7064
- Volume :
- 79
- Database :
- MEDLINE
- Journal :
- Neuropharmacology
- Publication Type :
- Academic Journal
- Accession number :
- 24225197
- Full Text :
- https://doi.org/10.1016/j.neuropharm.2013.10.034