Cited by 222Nicotinic Acetylcholine Receptors StudyNeuroscience and Neuropharmacology ResearchSmoking Behavior and Cessation

Rodent Habenulo–Interpeduncular Pathway Expresses a Large Variety of Uncommon nAChR Subtypes, But Only the α3β4 and α3β3β4 Subtypes Mediate Acetylcholine Release

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Grady, Sharon R., Moretti, Milena, Zoli, Michele, Marks, Michael J., Zanardi, Alessio, Pucci, Luca, Clementi, Francesco, Gotti, Cecilia·2009·The Journal of Neuroscience

Abstract

Recent studies suggest that the neuronal nicotinic receptors (nAChRs) present in the habenulo–interpeduncular (Hb–IPn) system can modulate the reinforcing effect of addictive drugs and the anxiolytic effect of nicotine. Hb and IPn neurons express mRNAs for most nAChR subunits, thus making it difficult to establish the subunit composition of functional receptors. We used immunoprecipitation and immunopurification studies performed in rat and wild-type (+/+) and β2 knock-out (−/−) mice to establish that the Hb and IPn contain significant β2* and β4* populations of nAChR receptors (each of which is heterogeneous). The β4* nAChR are more highly expressed in the IPn. We also identified novel native subtypes (α2β2*, α4β3β2*, α3β3β4*, α6β3β4*). Our studies on IPn synaptosomes obtained from +/+ and α2, α4, α5, α6, α7, β2, β3, and β4−/−mice show that only the α3β4 and α3β3β4 subtypes facilitate acetylcholine (ACh) release. Ligand binding, immunoprecipitation, and Western blotting studies in β3−/−mice showed that, in the IPn of these mice, there is a concomitant reduction of ACh release and α3β4* receptors, whereas the receptor number remains the same in the Hb. We suggest that, in habenular cholinergic neurons, the β3 subunit may be important for transporting the α3β4* subtype from the medial habenula to the IPn. Overall, these studies highlight the presence of a wealth of uncommon nAChR subtypes in the Hb–IPn system and identify α3β4 and α3β3β4, transported from the Hb and highly enriched in the IPn, as the subtypes modulating ACh release in the IPn.

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Crossref · 10.1523/jneurosci.5121-08.2009

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  • α2 subunits are highly enriched in the IPN, similar to α5 subunits.

    “Similar to α5 subunits, α2 subunits are highly enriched in the IPN (Grady et al. 2009).”

    From Mechanisms of Nicotine Addiction (2021) · cites this paper as Grady et al. 2009

    The Results (Subunit composition of nAChRs in rat interpeduncular nucleus; page unavailable) report α2 and α5 in the IPN, but classify both as present at moderate levels, not high levels. The Discussion (Native subtypes in the habenulo-interpeduncular system; page unavailable) says α2β2* receptors are restricted to the IPN relative to the habenula. That supports IPN localization, but not the claim that α2 and α5 are both highly enriched there. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • The α5, α3, and β4 subunits are potential targets for treatments of nicotine withdrawal syndrome.

    “and are potential targets for treatments of the nicotine withdrawal syndrome (Grady et al. 2009).”

    From Nicotine Withdrawal (2015) · cites this paper as Grady et al. 2009

    The Discussion (Pathophysiology of α3β4* nAChR subtypes; page unavailable) links α3β4-containing receptors to addictive-drug self-administration, providing some rationale for investigating them. It does not identify α5, α3, and β4 as treatment targets for nicotine withdrawal or assess withdrawal treatments. (LLM, conf=0.78)

    Experimental — accuracy not yet measured
  • Antibody specificity was verified by quantitative immunoprecipitation or immunopurification using nAChRs from various CNS areas of wild-type and null mutant mice, which allowed selection of subunit-specific antibodies.

    “Antibody specificity was checked by means of quantitative immunoprecipitation or immunopurification experiments using nAChRs from different areas of the CNS of wild-type α4, α5, α6, β2, β3, and β4 (+/+) and null mutant (−/−) mice, which allowed selection of antibodies specific for the subunit of interest, and assessing the immunoprecipitation capacity of each antibody.”
  • α3 and β4 nAChR subunits are expressed at high levels in the MHb/IPN axis.

    “the α3 and β4 nAChR subunits are expressed at high levels in the MHb/IPN axis [222–224]”

    From Mechanistic insights into nicotine withdrawal (2011) · cites this paper as [223]

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Authors
Grady, S. R., Moretti, M., Zoli, M., Marks, M. J., Zanardi, A., Pucci, L., Clementi, F., & Gotti, C.
Affiliations
  • University of Colorado Boulder (US)
  • University of Milan (IT)
  • University of Modena and Reggio Emilia (IT)
Corresponding author
Gotti, Cecilia
Venue
The Journal of Neuroscience
Published
2009-02-18
Volume
29
Issue
7
Pages
2272-2282
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2146586474
Cited by
222
References
70
Citations by year
2026: 2 · 2025: 7 · 2024: 7 · 2023: 11 · 2022: 7 · 2021: 9 · 2020: 13 · 2019: 11 · 2018: 15 · 2017: 11 · 2016: 11 · 2015: 23 · 2014: 23 · 2013: 20 · 2012: 15
FWCI
7.24
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • IRIS UNIMORE (University of Modena and Reggio Emilia) (submittedVersion, cc-by)
Funders
  • Compagnia di San Paolo
  • Fondazione Cariplo
  • National Institutes of Health
  • National Institute on Drug Abuse (DA 015663, P30DA015663, R01DA003194, DA003194)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Health Sciences › Medicine › Physiology › Smoking Behavior and Cessation
Keywords
neuronal nicotinic acetylcholine receptors, medial habenula, interpeduncular nucleus, beta3 subunit, beta2 subunit, acetylcholine release, synaptosomes, drug reinforcement
MeSH terms
Acetylcholine, Animals, Male, Mesencephalon, Neural Pathways, Synaptic Transmission, Receptors, Nicotinic, Tegmentum Mesencephali, Rats, Sprague-Dawley, Presynaptic Terminals, Mice, Knockout, Habenula, Protein Subunits, Mice, Rats

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