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Impaired escape performance and enhanced conditioned fear in rats following exposure to an uncontrollable stressor are mediated by glutamate and nitric oxide in the dorsal raphe nucleus
Abstract
Exposure to uncontrollable aversive events produces a variety of behavioral consequences that do not occur if the aversive event is controllable. Accumulating evidence suggests that exaggerated excitation of serotonin (5-HT) neurons in the dorsal raphe nucleus (DRN) is sufficient to cause these same behaviors, such as poor shuttlebox escape performance and enhanced conditioned fear that occur 24 h after exposure to inescapable tailshock (IS). The aim of the present studies was to explore the possibility that N-methyl-D-aspartate (NMDA) receptor activation and nitric oxide (NO) formation within the DRN might be involved in mediating the behavioral consequences of IS. To this end, either the NMDA receptor antagonist 2-amino-5-phosphonovaleric acid (APV) or the nitric oxide synthase inhibitor Nw-nitro-L-arginine methyl ester (L-NAME), was microinjected into the DRN before IS or before testing 24 h later. Blocking NMDA receptors with APV in the DRN during IS prevented the usual impact of IS on escape responding and conditioned fear. However, injection of APV at the time of testing only reduced these effects. The DRN was shown to be the critical site mediating blockade of these behavioral changes since injection of APV lateral to the DRN did not alter the behavioral consequences of IS. Conversely, L-NAME was most effective in reversing the effects of IS when administered at the time of testing. These results suggest that there is glutamatergic input to the DRN at the time of IS th…
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Shuttlebox escape learning is very rapid; rodents escape with almost asymptotically fast latencies by the second or third trial.
“it is learned very rapidly. Indeed, rodents escape with almost asymptotically fast latencies by the second or third trial (e.g., Grahn, Watkins, & Maier, 2000).”
From Learned helplessness at fifty: Insights from neuroscience. (2016) · cites this paper as Grahn, Watkins, & Maier, 2000
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Metadata
- Authors
- Grahn, R. E., Watkins, L. R., & Maier, S. F.
- Affiliations
- Connecticut College (US)
- University of Colorado Boulder (US)
- Corresponding author
- Grahn, Ruth E
- ORCID
- Maier, Steven F
- Venue
- Behavioural Brain Research
- Publisher
- Elsevier BV
- Published
- 2000-07
- Volume
- 112
- Issue
- 1-2
- Pages
- 33-41
- ISSN
- 0166-4328 (ISSN-L)
- OpenAlex
- W2045751028
- Cited by
- 68
- References
- 47
- Citations by year
- 2025: 1 · 2023: 1 · 2020: 2 · 2019: 2 · 2018: 1 · 2017: 4 · 2016: 2 · 2015: 3 · 2014: 5 · 2013: 4 · 2012: 3
- FWCI
- 1.29
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Behavioural Brain Research (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute of Mental Health (MH-00314, MH 50479)
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
- Keywords
- uncontrollable stress, dorsal raphe nucleus, serotonergic neurons, NMDA receptor, nitric oxide, glutamate, fear conditioning, escape behavior, APV, L-NAME, glutamatergic input, neuroplasticity
- MeSH terms
- Animals, Conditioning, Psychological, Electroshock, Enzyme Inhibitors, Escape Reaction, Fear, Helplessness, Learned, Male, Models, Neurological, Nitric Oxide, Random Allocation, Raphe Nuclei, Serotonin, 2-Amino-5-phosphonovalerate, Receptors, N-Methyl-D-Aspartate, Rats, Sprague-Dawley, Glutamic Acid, NG-Nitroarginine Methyl Ester, Rats
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