Cited by 30Neurotransmitter Receptor Influence on BehaviorNeural and Behavioral Psychology StudiesNeuroscience and Neuropharmacology Research

Protracted maturation of forebrain afferent connections of the ventral tegmental area in the rat

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Yetnikoff, Leora, Reichard, Rhett A., Schwartz, Zachary M., Parsely, Kenneth P., Zahm, Daniel S.·2014·Journal of Comparative Neurology

Abstract

The mesocorticolimbic dopamine system has long attracted the interest of researchers concerned with the unique gamut of behavioral and mental health vulnerabilities associated with adolescence. Accordingly, the development of the mesocorticolimbic system has been studied extensively, but almost exclusively with regard to dopaminergic output, particularly in the nucleus accumbens and medial prefrontal cortex. To the contrary, the ontogeny of inputs to the ventral tegmental area (VTA), the source of mesocorticolimbic dopamine, has been neglected. This is not a trivial oversight, as the activity of VTA neurons, which reflects their capacity to transmit information about salient events, is sensitively modulated by inputs. Here, we assessed the development of VTA afferent connections using the β subunit of cholera toxin (Ctβ) as a retrograde axonal tracer in adolescent (postnatal day 39) and early adult (8–9‐week‐old) rats. After intra‐VTA injections of Ctβ, adolescent and early adult animals exhibited qualitatively similar distributions of retrogradely labeled neurons in the sense that VTA‐projecting neurons were present at all of the same rostrocaudal levels in all of the same structures in both age groups. However, quantitation of retrogradely labeled neurons revealed that adolescent brains, compared with early adult brains, had significantly fewer VTA‐projecting neurons preferentially within an interconnected network of cortical and striatopallidal forebrain structures. These findings provide a novel perspective on the development of the mesocorticolimbic dopamine system and may have important implications for age‐dependent specificity in the function of this system, particularly with regard to adolescent impulsivity and mental health vulnerabilities. J. Comp. Neurol. 522:1031–1047, 2014. © 2013 Wiley Periodicals, Inc.

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  • In rodents, adolescence is increasingly defined as the period from weaning (~PND 21) to neurobiological maturity around two months of age (~PND 60).

    “adolescence in rodents is increasingly defined more in line with this larger age window in humans, by counting the period from weaning (~PND 21) where mice and rats gain begin to interact independently with their environments for the first time”

    From Adolescent nicotine exposure and persistent neurocircuitry changes: unveiling lifelong psychiatric risks (2025) · cites this paper as [47]

    The Materials and Methods (Animals; page unavailable) says rat adolescence is typically conceived as PND 21–55, with early adulthood beginning between PND 55 and 60. That supports the approximate age window, but the passage does not extend the definition to mice or say that PND 21 marks independent interaction with the environment or that PND 60 marks neurobiological maturity. (LLM, conf=0.84)

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  1. Nauta WJH Domesick VB Livingston KE Hornykiewicz O 1978 Cross roads of limbic and striatal circuitary: hypothalamo-nigral connections Limbic mechanisms New York Plenum Press 75 93

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Authors
Yetnikoff, L., Reichard, R. A., Schwartz, Z. M., Parsely, K. P., & Zahm, D. S.
Affiliations
Saint Louis University (US)
Corresponding author
  • Yetnikoff, Leora
  • Zahm, Daniel S.
Venue
Journal of Comparative Neurology
Publisher
Wiley
Published
2014-02-12
Volume
522
Issue
5
Pages
1031-1047
ISSN
  • 0021-9967 (ISSN-L)
  • 1096-9861
OpenAlex
W1578486795
Cited by
30
References
176
Citations by year
2026: 1 · 2025: 1 · 2024: 2 · 2022: 3 · 2021: 4 · 2019: 1 · 2018: 1 · 2017: 3 · 2016: 5 · 2015: 4 · 2014: 3 · 2013: 2
FWCI
2.29
Type
journal article
Language
en
Open access
Locations
  • The Journal of Comparative Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Instituites of Health (NS-23805)
  • Fonds Québécois de la Recherche sur la Nature et les Technologies
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
ventral tegmental area, mesocorticolimbic dopamine system, afferent connections, forebrain development, adolescent development, early adulthood, retrograde tracing, cortical projections, impulsivity, psychiatric vulnerability
MeSH terms
Afferent Pathways, Age Factors, Animals, Animals, Newborn, Cell Count, Cholera Toxin, Iontophoresis, Male, Neurons, Nucleus Accumbens, Prosencephalon, Rats, Sprague-Dawley, Ventral Tegmental Area, Rats

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