Cited by 188Parkinson's Disease Mechanisms and TreatmentsNicotinic Acetylcholine Receptors StudyNuclear Receptors and Signaling

Dose‐related neuroprotective effects of chronic nicotine in 6‐hydroxydopamine treated rats, and loss of neuroprotection in α4 nicotinic receptor subunit knockout mice

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Ryan, R E, Ross, S A, Drago, J, Loiacono, R E·2001·British Journal of Pharmacology

Abstract

The present study examined the effect of a range of doses of chronic nicotine (0.75, 1.5, 3.0 and 30.0 mg kg−1 day−1, s.c., 14 days) upon striatal dopaminergic nerve terminal survival following 6‐hydroxydopamine (6‐OHDA; 10 μg intrastriatal unilaterally) in rats; and the effects of acute nicotine (1 mg kg−1, s.c.) pretreatment upon striatal neurodegeneration induced by methamphetamine (5 mg kg−1, i.p., three doses at 2 h intervals) in wild‐type and α4 nicotinic receptor (nAChR) subunit knockout mice. In both models of Parkinsonian‐like damage, loss of striatal dopaminergic nerve terminals was assessed by [3 H]‐mazindol autoradiography. In rats, chronic nicotine infusion delivered by osmotic minipump implanted subcutaneously 7 days prior to intrastriatal 6‐OHDA injection produced significant and dose‐related protection against 6‐OHDA‐induced neurodegeneration. Low (0.75 and 1.5 mg kg−1 day−1) but not high (3.0 and 30.0 mg kg−1 day−1) nicotine doses significantly inhibited 6‐OHDA‐induced degeneration. In wild‐type mice, acute nicotine treatment produced significant inhibition of methamphetamine‐induced neurodegeneration. In α4 nAChR subunit knockout mice, acute nicotine treatment failed to inhibit methamphetamine‐induced neurodegeneration. Nicotine is capable of protecting dopaminergic neurons against Parkinsonian‐like neurodegeneration in vivo. In rats, this neuroprotective effect is critically dependent upon nicotine dose and is consistent with the activation of nAChRs, as high, desensitizing doses of nicotine fail to be neuroprotective. Further, neuroprotection is absent in α4 nAChR subunit knockout mice. The current results therefore suggest that activation of α4 subunit containing nAChRs constitutes a major component of the neuroprotective effect of nicotine upon Parkinsonian‐like damage in vivo. British Journal of Pharmacology (2001) 132, 1650–1656; doi:10.1038/sj.bjp.0703989

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  1. Arneric, S.P. & Brioni, J.D. pp. 127 ± 139, Wiley-Liss.

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Authors
Ryan, R. E., Ross, S. A., Drago, J., & Loiacono, R. E.
Affiliations
  • Monash University (AU)
  • Monash Medical Centre (AU)
Corresponding author
Ryan, R E
Venue
British Journal of Pharmacology
Publisher
Wiley
Published
2001-04
Volume
132
Issue
8
Pages
1650-1656
ISSN
  • 0007-1188 (ISSN-L)
  • 1476-5381
OpenAlex
W1993742630
Cited by
188
References
51
Citations by year
2026: 1 · 2025: 4 · 2024: 1 · 2023: 6 · 2022: 2 · 2021: 8 · 2020: 8 · 2019: 5 · 2018: 7 · 2017: 3 · 2016: 8 · 2015: 5 · 2014: 8 · 2013: 7 · 2012: 5
FWCI
10.14
Type
journal article
Language
en
Open access
Locations
  • British Journal of Pharmacology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Monash University
  • University of Melbourne
  • Medical Research Council
  • National Health and Medical Research Council
Topics
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nuclear Receptors and Signaling
Keywords
nicotine, neuroprotection, 6-hydroxydopamine, methamphetamine, striatal dopaminergic neurons, Parkinson's disease, receptor desensitization, dose-dependent effects, knockout mice, neurodegeneration
MeSH terms
Animals, Dopamine, Dose-Response Relationship, Drug, Hydroxydopamines, Male, Methamphetamine, Nerve Endings, Nicotine, Receptors, Nicotinic, Sympathectomy, Chemical, Rats, Sprague-Dawley, Mice, Knockout, Neuroprotective Agents, Nicotinic Agonists, Dopamine Uptake Inhibitors, Mice, Rats

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