Age-dependent effects of initial exposure to nicotine on serotonin neurons
Open accessAbstract
Adolescence is a critical vulnerable period during which exposure to nicotine greatly enhances the possibility to develop drug addiction. Growing evidence suggests that serotonergic (5-HT) neurotransmission may contribute to the initiation and maintenance of addictive behavior. As the dorsal raphe (DR) and median raphe (MnR) nuclei are the primary 5-HT source to the forebrain, the current study tested the hypothesis that there are age-dependent effects of acute nicotine administration on activation of 5-HT neurons within these regions. Both adolescent (Postnatal day 30) and adult (Postnatal day 70) male Sprague-Dawley rats received subcutaneous injection of either saline or nicotine (0.2, 0.4, or 0.8 mg/kg). Subsequently, the number of 5-HT cells that were double-labeled for Fos and tryptophan hydroxylase was counted in seven subregions within the DR and the entire MnR. The results show that acute nicotine injection induces Fos expression in 5-HT neurons in a region-specific manner. In addition, adolescents show broader regional activations at either a lower (0.2 mg/kg) and a higher (0.8 mg/kg) dose of nicotine, displaying a unique U-shape response curve across doses. In contrast, 5-HT cells with activated Fos expression were restricted to fewer regions in adults, and the patterns of expression were more consistent across doses. The results reveal dose-dependent effects of nicotine during adolescence with apparent sensitization at different ends of the dosage spectrum examined compared to adults. These data indicate that initial exposure to nicotine may have unique effects in adolescence on the ascending 5-HT system, with the potential for consequences on the affective-motivational qualities of the drug and the subsequent propensity for repeated use.
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Serotonin systems are uniquely sensitive to nicotine during adolescence.
“Serotonin systems are also uniquely sensitive to nicotine during adolescence (Slotkin & Seidler, 2009; Bang & Commons, 2011; Dao et al., 2011).”
From Unique, long-term effects of nicotine on adolescent brain. (2020) · cites this paper as Bang & Commons, 2011
Animal studies point to the unique sensitivity of the adolescent serotonin system to regulation by nicotine.
“Although dopamine is clearly involved, animal studies also point to the unique sensitivity of the adolescent serotonin system to regulation by nicotine (Shearman et al. 2008; Bang & Commons, 2011; Dao et al. 2011).”
From <scp>N</scp> icotine and the adolescent brain (2015) · cites this paper as Bang & Commons, 2011
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<scp>N</scp> icotine and the adolescent brain
Yuan, M., Cross, S. J., Loughlin, S. E., & Leslie, F. M. (2015) · The Journal of Physiology · doi:10.1113/jp270492 · Cited by 582 · see citing works
Unique, long-term effects of nicotine on adolescent brain.
Leslie, F. M. (2020) · Pharmacology, Biochemistry, and Behavior · doi:10.1016/j.pbb.2020.173010 · Cited by 178 · see citing works
- Authors
- Bang, S. J., & Commons, K. G.
- Affiliations
- Boston Children's Hospital (US)
- ORCID
- Commons, K.G.
- Venue
- Neuroscience
- Publisher
- Elsevier BV
- Published
- 2011-04
- Volume
- 179
- Pages
- 1-8
- ISSN
- 0306-4522 (ISSN-L)
- PMC
- PMC3059362
- OpenAlex
- W1983755815
- Cited by
- 12
- References
- 11
- Citations by year
- 2024: 2 · 2020: 2 · 2019: 1 · 2018: 1 · 2017: 1 · 2016: 1 · 2015: 1 · 2014: 1 · 2013: 1
- FWCI
- 0.65
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Neuroscience (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institute on Drug Abuse (DA‐021801, R01DA021801)
- Topics
- Health Sciences › Medicine › Physiology › Smoking Behavior and Cessation
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
- Keywords
- nicotine, serotonergic neurons, dorsal raphe nucleus, median raphe nucleus, adolescence, age-dependent effects, Fos expression, tryptophan hydroxylase, acute nicotine administration, dose-response relationship, drug addiction, serotonergic system, sensitization
- MeSH terms
- Age Factors, Animals, Immunohistochemistry, Male, Neurons, Nicotine, Raphe Nuclei, Serotonin, Behavior, Addictive, Proto-Oncogene Proteins c-fos, Rats, Sprague-Dawley, Nicotinic Agonists, Rats
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