Cited by 194Neurotransmitter Receptor Influence on BehaviorStress Responses and CortisolNeuropeptides and Animal Physiology

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Nucleus accumbens corticotropin-releasing factor increases cue-triggered motivation for sucrose reward: paradoxical positive incentive effects in stress?

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Abstract

Background: Corticotropin-releasing factor (CRF) is typically considered to mediate aversive aspects of stress, fear and anxiety. However, CRF release in the brain is also elicited by natural rewards and incentive cues, raising the possibility that some CRF systems in the brain mediate an independent function of positive incentive motivation, such as amplifying incentive salience. Here we asked whether activation of a limbic CRF subsystem magnifies the increase in positive motivation for reward elicited by incentive cues previously associated with that reward, in a way that might exacerbate cue-triggered binge pursuit of food or other incentives? We assessed the impact of CRF microinjections into the medial shell of nucleus accumbens using a pure incentive version of Pavlovian-Instrumental transfer, a measure specifically sensitive to the incentive salience of reward cues (which it separates from influences of aversive stress, stress reduction, frustration and other traditional explanations for stress-increased behavior). Rats were first trained to press one of two levers to obtain sucrose pellets, and then separately conditioned to associate a Pavlovian cue with free sucrose pellets. On test days, rats received microinjections of vehicle, CRF (250 or 500 ng/0.2 μl) or amphetamine (20 μg/0.2 μl). Lever pressing was assessed in the presence or absence of the Pavlovian cues during a half-hour test. Results: Microinjections of the highest dose of CRF (500 ng) or amphetamine (20 μg) selectively enhanced the ability of Pavlovian reward cues to trigger phasic peaks of increased instrumental performance for a sucrose reward, each peak lasting a minute or so before decaying after the cue. Lever pressing was not enhanced by CRF microinjections in the baseline absence of the Pavlovian cue or during the presentation without a cue, showing that the CRF enhancement could not be explained as a result of generalized motor arousal, frustration or stress, or by persistent attempts to ameliorate aversive states. Conclusion: We conclude that CRF in nucleus accumbens shell amplifies positive motivation for cued rewards, in particular by magnifying incentive salience that is attributed to Pavlovian cues previously associated with those rewards. CRF-induced magnification of incentive salience provides a novel explanation as to why stress may produce cue-triggered bursts of binge eating, drug addiction relapse, or other excessive pursuits of rewards.

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Crossref · 10.1186/1741-7007-4-8

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Figures

Figure 1 Fos plumes. Coronal sections showing point sample positions used to identify local Fos plumes around microinjection site. A. Vehicle microinjection produces merely low elevation of Fos compared to normal virgin tissue. Radial arms extending from center show sampling points for Fos measurement (125 μm × 125 μm blocks; 5× magnification). B. CRF microinjection induces intense elevation over normal tissue levels (depicted by color: 10× elevation over normal denoted by yellow, 5× = dark orange; 2× = light orange). CRF also causes elevation compared to vehicle microinjection levels at equivalent points (depicted by dotted lines; 3× relative increase over vehicle-levels denoted by thick dotted line, 5× = thin dotted line; upper right; plume from CRF 500 ng dose in 0.2 μl microinjection volume).
Figure 1 Fos plumes. Coronal sections showing point sample positions used to identify local Fos plumes around microinjection site. A. Vehicle microinjection produces merely low elevation of Fos compared to normal virgin tissue. Radial arms extending from center show sampling points for Fos measurement (125 μm × 125 μm blocks; 5× magnification). B. CRF microinjection induces intense elevation over normal tissue levels (depicted by color: 10× elevation over normal denoted by yellow, 5× = dark orange; 2× = light orange). CRF also causes elevation compared to vehicle microinjection levels at equivalent points (depicted by dotted lines; 3× relative increase over vehicle-levels denoted by thick dotted line, 5× = thin dotted line; upper right; plume from CRF 500 ng dose in 0.2 μl microinjection volume).CC BY · PubMed Central
Figure 2 Fos plume maps of CRF (500 ng) amplification of cue-triggered increases in lever pressing. Fos plume maps of functional localization: CRF effects on cue-triggered incentive salience. Sagittal (A), horizontal (B), and coronal maps (C) show each Fos plume as colored symbol in medial shell of nucleus accumbens. Color depicts magnification effect of CRF (500 ng) microinjection at that site on peaks of lever pressing triggered by a 30 sec auditory CS+ previously associated with sucrose reward (within-subject percentage elevation of CRF versus vehicle in the same rat; 100%=vehicle). Size of central symbol depicts radius of intense Fos elevation; size of surrounding halos depict outer radius of moderate Fos elevation. For the sagittal map, bilateral accumbens sites from left and right sides of each rat brain are collapsed together into one combined sagittal map of accumbens for simplicity. Maps adapted from Paxinos and Watson [46].
Figure 2 Fos plume maps of CRF (500 ng) amplification of cue-triggered increases in lever pressing. Fos plume maps of functional localization: CRF effects on cue-triggered incentive salience. Sagittal (A), horizontal (B), and coronal maps (C) show each Fos plume as colored symbol in medial shell of nucleus accumbens. Color depicts magnification effect of CRF (500 ng) microinjection at that site on peaks of lever pressing triggered by a 30 sec auditory CS+ previously associated with sucrose reward (within-subject percentage elevation of CRF versus vehicle in the same rat; 100%=vehicle). Size of central symbol depicts radius of intense Fos elevation; size of surrounding halos depict outer radius of moderate Fos elevation. For the sagittal map, bilateral accumbens sites from left and right sides of each rat brain are collapsed together into one combined sagittal map of accumbens for simplicity. Maps adapted from Paxinos and Watson [46].CC BY · PubMed Central
Figure 3 Enhancement of incentive motivation by CRF. Effects on cue-triggered lever pressing during extinction test caused by CRF (250 and 500 ng) and amphetamine (20 μg) microinjections in the caudal medial accumbens shell. A. Lines show pressing in the presence of the CS+ (previously associated with sucrose- red circles); and CS- (never associated with sucrose- blue circles); and pre-CS+ baseline period (no-stimulus 30 sec period immediately prior to CS+ stimulus); and pre-CS- baseline period (30 sec immediately prior to CS- stimulus). The left panel depicts lever pressing on the control lever that had previously produced instrumental sucrose reward during training (but not during extinction test). The right panel depicts lever pressing on the control lever that was never had produced reward. Both 500 ng CRF and 20 μg amphetamine increased the ability of the sucrose CS+ cue (but not CS-) to trigger enhanced responding on the previously sucrose-associated lever (but not on the control lever). B. Transform scores show a direct contrast between CS+ and CS- effects of lever pressing. CS+ effects on cue-triggered lever pressing are amplified by CRF (500 ng) and by amphetamine (20 μg) microinjections.
Figure 3 Enhancement of incentive motivation by CRF. Effects on cue-triggered lever pressing during extinction test caused by CRF (250 and 500 ng) and amphetamine (20 μg) microinjections in the caudal medial accumbens shell. A. Lines show pressing in the presence of the CS+ (previously associated with sucrose- red circles); and CS- (never associated with sucrose- blue circles); and pre-CS+ baseline period (no-stimulus 30 sec period immediately prior to CS+ stimulus); and pre-CS- baseline period (30 sec immediately prior to CS- stimulus). The left panel depicts lever pressing on the control lever that had previously produced instrumental sucrose reward during training (but not during extinction test). The right panel depicts lever pressing on the control lever that was never had produced reward. Both 500 ng CRF and 20 μg amphetamine increased the ability of the sucrose CS+ cue (but not CS-) to trigger enhanced responding on the previously sucrose-associated lever (but not on the control lever). B. Transform scores show a direct contrast between CS+ and CS- effects of lever pressing. CS+ effects on cue-triggered lever pressing are amplified by CRF (500 ng) and by amphetamine (20 μg) microinjections.CC BY · PubMed Central
Figure 4 Temporal pattern of lever pressing within test session. Minute-by-minute time-course of lever pressing peaks on sucrose-associated lever after microinjections of (A) vehicle, (B) amphetamine 20 μg, (C) CRF 500 ng, and (D) CRF 250 ng. Open circles depict lever pressing during presentation of the 30-sec CS- and filled circles during presentation of the CS+. Lever pressing is also shown during the 30 sec period before each CS+ or CS- (precue baseline), and during the 30 sec period that followed each CS+ or CS- (post-cue period). Both CRF (500 ng) and amphetamine (20 μg) magnified intense, transient, reversible, and repeatable peaks in pressing on sucrose-associated lever each time the CS+ occurred. Magnified lever pressing after CRF (500 ng) or amphetamine (20 μg) was triggered by each presentation of the sucrose cue, but then was followed by a rapid descent back to normal baseline levels of pressing once the cue ended (B and C).
Figure 4 Temporal pattern of lever pressing within test session. Minute-by-minute time-course of lever pressing peaks on sucrose-associated lever after microinjections of (A) vehicle, (B) amphetamine 20 μg, (C) CRF 500 ng, and (D) CRF 250 ng. Open circles depict lever pressing during presentation of the 30-sec CS- and filled circles during presentation of the CS+. Lever pressing is also shown during the 30 sec period before each CS+ or CS- (precue baseline), and during the 30 sec period that followed each CS+ or CS- (post-cue period). Both CRF (500 ng) and amphetamine (20 μg) magnified intense, transient, reversible, and repeatable peaks in pressing on sucrose-associated lever each time the CS+ occurred. Magnified lever pressing after CRF (500 ng) or amphetamine (20 μg) was triggered by each presentation of the sucrose cue, but then was followed by a rapid descent back to normal baseline levels of pressing once the cue ended (B and C).CC BY · PubMed Central
Figure 5 Response competition between sucrose dish approach and lever pressing. A. Averaged time-course of approach responses to sucrose dish just before, during and after first CS+ cue presentation. B. Same information for pressing on sucrose-associated lever. Each panel compares cue-triggered responding after microinjections of vehicle (white circles), CRF 500 μg (green circles), CRF 250 μg (blue circles), or amphetamine 20 μg (red circles). Both CRF and amphetamine reduced the peak of cue-triggered approaches to the sucrose dish, but simultaneously increased cue-triggered lever pressing. It is impossible to perform both actions at exactly the same time, and so conditioned dish approaches may have been suppressed as a result of response competition from increased lever pressing that occurred during the same 30-sec period.
Figure 5 Response competition between sucrose dish approach and lever pressing. A. Averaged time-course of approach responses to sucrose dish just before, during and after first CS+ cue presentation. B. Same information for pressing on sucrose-associated lever. Each panel compares cue-triggered responding after microinjections of vehicle (white circles), CRF 500 μg (green circles), CRF 250 μg (blue circles), or amphetamine 20 μg (red circles). Both CRF and amphetamine reduced the peak of cue-triggered approaches to the sucrose dish, but simultaneously increased cue-triggered lever pressing. It is impossible to perform both actions at exactly the same time, and so conditioned dish approaches may have been suppressed as a result of response competition from increased lever pressing that occurred during the same 30-sec period.CC BY · PubMed Central

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Research works printed but not linked: 1

  1. Toates FM: Motivational Systems. 1986, Cambridge: Cambridge University Press

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Metadata

Authors
Peciña, S., Schulkin, J., & Berridge, K. C.
Affiliations
  • University of Michigan (US)
  • Georgetown University (US)
Corresponding author
Peciña, Susana
Venue
BMC Biology
Published
2006-04-13
Volume
4
Issue
1
Pages
8-8
ISSN
1741-7007 (ISSN-L)
OpenAlex
W1789705209
Cited by
194
References
64
Citations by year
2026: 4 · 2025: 8 · 2024: 8 · 2023: 5 · 2022: 13 · 2021: 8 · 2020: 5 · 2019: 12 · 2018: 14 · 2017: 6 · 2016: 7 · 2015: 8 · 2014: 14 · 2013: 9 · 2012: 17
FWCI
4.18
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • BMC Biology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Deep Blue (University of Michigan) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institutes of Health
  • National Institute of Mental Health (MH-63649, R01MH063649)
  • National Institute on Drug Abuse (DA015188, R01DA015188)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
Keywords
corticotropin-releasing factor, nucleus accumbens shell, incentive salience, Pavlovian-to-instrumental transfer, sucrose reward, incentive motivation, stress, binge eating, amphetamine, reward cues
MeSH terms
Animals, Corticotropin-Releasing Hormone, Cues, Male, Microinjections, Motivation, Nucleus Accumbens, Reinforcement, Psychology, Reward, Stress, Physiological, Sucrose, Rats, Sprague-Dawley, Rats

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