Abstract
Following intracerebroventricular (i.c.v.) injection of ovine CRF (oCRF), an endogenous peptide agonist at both CRF1 and CRF2 receptors, defensive behaviors of CD-1 mice were evaluated in the Mouse Defensive Test Battery (MDTB). Behavioral measures taken before, during, and after predator (a hand-held anesthetized rat) confrontation included exploratory activity, risk assessment, avoidance, flight, freezing, defensive threat/attack, and residual emotional responses. Both low (0.1 nmol) and high (0.2 nmol) doses of oCRF robustly suppressed exploratory activities and increased risk assessment during the initial familiarization period. Flight speed and jump escapes when the mouse was chased were significantly elevated by the 0.2 nmol dose. Both doses enhanced freezing and avoidance to a distant predator when the escape route was blocked. The 0.2 nmol dose also potentiated flight responses to a contacting predator in a highly confined space. Both oCRF groups traveled shorter distances and exhibited less escape attempts following the removal of the threat stimulus. These findings indicate that non-selective activation of corticotropin-releasing factor (CRF) receptors via ventricular infusion of oCRF potentiates defensive behaviors relevant to the demand of specific challenges, generally enhancing the predominant defensive behavior in each specific situation.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1-8 |
| Number of pages | 8 |
| Journal | Behavioural Brain Research |
| Volume | 171 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jul 15 2006 |
| Externally published | Yes |
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Keywords
- CRF agonist
- Defensive behaviors
- Mice
- oCRF
ASJC Scopus subject areas
- Behavioral Neuroscience
Cite this
Central infusion of ovine CRF (oCRF) potentiates defensive behaviors in CD-1 mice in the Mouse Defense Test Battery (MDTB). / Yang, Mu; Farrokhi, Catherine; Vasconcellos, Amy; Blanchard, Robert J.; Blanchard, D. Caroline.
In: Behavioural Brain Research, Vol. 171, No. 1, 15.07.2006, p. 1-8.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Central infusion of ovine CRF (oCRF) potentiates defensive behaviors in CD-1 mice in the Mouse Defense Test Battery (MDTB)
AU - Yang, Mu
AU - Farrokhi, Catherine
AU - Vasconcellos, Amy
AU - Blanchard, Robert J.
AU - Blanchard, D. Caroline
PY - 2006/7/15
Y1 - 2006/7/15
N2 - Following intracerebroventricular (i.c.v.) injection of ovine CRF (oCRF), an endogenous peptide agonist at both CRF1 and CRF2 receptors, defensive behaviors of CD-1 mice were evaluated in the Mouse Defensive Test Battery (MDTB). Behavioral measures taken before, during, and after predator (a hand-held anesthetized rat) confrontation included exploratory activity, risk assessment, avoidance, flight, freezing, defensive threat/attack, and residual emotional responses. Both low (0.1 nmol) and high (0.2 nmol) doses of oCRF robustly suppressed exploratory activities and increased risk assessment during the initial familiarization period. Flight speed and jump escapes when the mouse was chased were significantly elevated by the 0.2 nmol dose. Both doses enhanced freezing and avoidance to a distant predator when the escape route was blocked. The 0.2 nmol dose also potentiated flight responses to a contacting predator in a highly confined space. Both oCRF groups traveled shorter distances and exhibited less escape attempts following the removal of the threat stimulus. These findings indicate that non-selective activation of corticotropin-releasing factor (CRF) receptors via ventricular infusion of oCRF potentiates defensive behaviors relevant to the demand of specific challenges, generally enhancing the predominant defensive behavior in each specific situation.
AB - Following intracerebroventricular (i.c.v.) injection of ovine CRF (oCRF), an endogenous peptide agonist at both CRF1 and CRF2 receptors, defensive behaviors of CD-1 mice were evaluated in the Mouse Defensive Test Battery (MDTB). Behavioral measures taken before, during, and after predator (a hand-held anesthetized rat) confrontation included exploratory activity, risk assessment, avoidance, flight, freezing, defensive threat/attack, and residual emotional responses. Both low (0.1 nmol) and high (0.2 nmol) doses of oCRF robustly suppressed exploratory activities and increased risk assessment during the initial familiarization period. Flight speed and jump escapes when the mouse was chased were significantly elevated by the 0.2 nmol dose. Both doses enhanced freezing and avoidance to a distant predator when the escape route was blocked. The 0.2 nmol dose also potentiated flight responses to a contacting predator in a highly confined space. Both oCRF groups traveled shorter distances and exhibited less escape attempts following the removal of the threat stimulus. These findings indicate that non-selective activation of corticotropin-releasing factor (CRF) receptors via ventricular infusion of oCRF potentiates defensive behaviors relevant to the demand of specific challenges, generally enhancing the predominant defensive behavior in each specific situation.
KW - CRF agonist
KW - Defensive behaviors
KW - Mice
KW - oCRF
UR - http://www.scopus.com/inward/record.url?scp=33646565663&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33646565663&partnerID=8YFLogxK
U2 - 10.1016/j.bbr.2006.03.013
DO - 10.1016/j.bbr.2006.03.013
M3 - Article
VL - 171
SP - 1
EP - 8
JO - Behavioural Brain Research
JF - Behavioural Brain Research
SN - 0166-4328
IS - 1
ER -