Fear Extinction across Development: The Involvement of the Medial Prefrontal Cortex as Assessed by Temporary Inactivation and Immunohistochemistry
Open accessAbstract
Extinction in adult animals, including humans, appears to involve the medial prefrontal cortex (mPFC). However, the role of mPFC in extinction across development has not yet been studied. Given several recent demonstrations of developmental differences in extinction of conditioned fear at a behavioral level, different neural circuitries may mediate fear extinction across development. In all experiments, noise conditioned stimulus (CS) and shock unconditioned stimulus (US) were used. In experiment 1A, temporary unilateral inactivation of the mPFC during extinction training impaired long-term extinction the following day in postnatal day 24 (P24) rats but not in P17 rats. In experiment 1B, bilateral inactivation of the mPFC again failed to disrupt long-term extinction in P17 rats. In experiment 2, extinction training increased phosphorylated mitogen-activated protein kinase (pMAPK) in the mPFC for P24 rats but not for P17 rats, whereas rats of both ages displayed elevated pMAPK in the amygdala. Across both ages, “not trained,” “reactivated,” and “no extinction” control groups expressed very low numbers of pMAPK-immunoreactive (IR) neurons across both neural structures. This result indicates that the mere conditioning experience, the exposure to the CS, or the expression of CS-elicited fear in and of itself is not sufficient to explain the observed increase in pMAPK-IR neurons in the mPFC and/or the amygdala after extinction. Together, these findings show that extinction in P17 rats does not involve the mPFC, which has important theoretical and clinical implications for the treatment of anxiety disorders in humans.
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The medial prefrontal cortex is not involved in extinction of learned fear in preweanling rats.
“the medial prefrontal cortex (PFC) is not involved in extinction of learned fear in preweanling rats (Kim et al, 2009)”
From Impaired Extinction Retention in Adolescent Rats: Effects of D-Cycloserine (2010) · cites this paper as Kim et al, 2009
The medial prefrontal cortex is critically involved in extinction of learned fear in postweaning and adult rats.
“but is critically involved in postweaning and adult rats (Herry and Garcia, 2003;Kim et al, 2009).”
From Impaired Extinction Retention in Adolescent Rats: Effects of D-Cycloserine (2010) · cites this paper as Kim et al, 2009
Recent research with rodents and humans has shown distinctive developmental profiles of blunted threat extinction recall in adolescents relative to children and adults.
“Recent research with rodents and humans has shown distinctive developmental profiles of blunted threat extinction recall in adolescents6–11, relative to children and adults.”
From Multimodal evidence for delayed threat extinction learning in adolescence and young adulthood (2019) · cites this paper as [9]
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- Authors
- Kim, J. H., Hamlin, A. S., & Richardson, R.
- Affiliations
- UNSW Sydney (AU)
- The University of Queensland (AU)
- Venue
- The Journal of Neuroscience
- Publisher
- Society for Neuroscience
- Published
- 2009-09-02
- Volume
- 29
- Issue
- 35
- Pages
- 10802-10808
- ISSN
- 0270-6474 (ISSN-L)
- 1529-2401
- PMC
- PMC6665532
- OpenAlex
- W1969258026
- Cited by
- 154
- References
- 40
- Citations by year
- 2024: 6 · 2023: 9 · 2022: 7 · 2021: 4 · 2020: 12 · 2019: 15 · 2018: 12 · 2017: 11 · 2016: 12 · 2015: 11 · 2014: 9 · 2013: 15 · 2012: 10
- FWCI
- 5.02
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Figshare (submittedVersion, cc-by)
- Minerva Access (University of Melbourne) (submittedVersion, cc-by-nc-sa)
- Funders
- Australian Research Council (DP0346139, DP0666953)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
- Keywords
- fear extinction, medial prefrontal cortex, developmental differences, extinction memory consolidation, mitogen-activated protein kinase, amygdala, anxiety disorders, rats
- MeSH terms
- Animals, Animals, Newborn, Extinction, Psychological, Fear, Immunohistochemistry, Male, Neural Inhibition, Neuronal Plasticity, Time Factors, Rats, Sprague-Dawley, Prefrontal Cortex, Freezing Reaction, Cataleptic, Rats
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