Abstract
Various lines of evidence suggest a role in cognition for the endogenous neuropeptide, neurotensin, involving an interaction with the central nervous system cholinergic pathways. A preliminary study has shown that central administration of neurotensin enhances spatial and nonspatial working memory in the presence of scopolamine, a muscarinic receptor antagonist which induces memory deficits. Utilizing similar methods, the present study employed a two-trial novel object discrimination task to determine the acute effect of a neurotensin peptide analogue with improved metabolic stability, PD149163, on recognition memory in Lister hooded rats. Consistent with previous findings with neurotensin, animals receiving an intracerebroventricular injection of PD149163 (3 μg) significantly discriminated the novel from familiar object during the choice trial. In addition, a similar dose of PD149163 restored the scopolamine-induced deficit in novelty recognition. The restoration effect on scopolamine-induced amnesia produced by PD149163 was blocked by SR142948A, a nonselective neurotensin receptor antagonist, at a dose of 1 mg/kg (intraperitonial) but not at 0.1 mg/kg. In conclusion, the present results confirm a role for neurotensin in mediating memory processes, possibly via central cholinergic mechanisms.
| Original language | English |
|---|---|
| Pages (from-to) | 357-362 |
| Number of pages | 6 |
| Journal | Behavioural Pharmacology |
| Volume | 17 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Jun 2006 |
Fingerprint
Keywords
- Cholinergic pathways
- Memory
- Neurotensin
- PD149163
- Rat
- SR142948A
ASJC Scopus subject areas
- Pharmacology
- Neuroscience(all)
Cite this
Effects of a neurotensin analogue (PD149163) and antagonist (SR142948A) on the scopolamine-induced deficits in a novel object discrimination task. / Azmi, Norazrina; Norman, Christine; Spicer, Clare H.; Bennett, Geoffrey W.
In: Behavioural Pharmacology, Vol. 17, No. 4, 06.2006, p. 357-362.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of a neurotensin analogue (PD149163) and antagonist (SR142948A) on the scopolamine-induced deficits in a novel object discrimination task
AU - Azmi, Norazrina
AU - Norman, Christine
AU - Spicer, Clare H.
AU - Bennett, Geoffrey W.
PY - 2006/6
Y1 - 2006/6
N2 - Various lines of evidence suggest a role in cognition for the endogenous neuropeptide, neurotensin, involving an interaction with the central nervous system cholinergic pathways. A preliminary study has shown that central administration of neurotensin enhances spatial and nonspatial working memory in the presence of scopolamine, a muscarinic receptor antagonist which induces memory deficits. Utilizing similar methods, the present study employed a two-trial novel object discrimination task to determine the acute effect of a neurotensin peptide analogue with improved metabolic stability, PD149163, on recognition memory in Lister hooded rats. Consistent with previous findings with neurotensin, animals receiving an intracerebroventricular injection of PD149163 (3 μg) significantly discriminated the novel from familiar object during the choice trial. In addition, a similar dose of PD149163 restored the scopolamine-induced deficit in novelty recognition. The restoration effect on scopolamine-induced amnesia produced by PD149163 was blocked by SR142948A, a nonselective neurotensin receptor antagonist, at a dose of 1 mg/kg (intraperitonial) but not at 0.1 mg/kg. In conclusion, the present results confirm a role for neurotensin in mediating memory processes, possibly via central cholinergic mechanisms.
AB - Various lines of evidence suggest a role in cognition for the endogenous neuropeptide, neurotensin, involving an interaction with the central nervous system cholinergic pathways. A preliminary study has shown that central administration of neurotensin enhances spatial and nonspatial working memory in the presence of scopolamine, a muscarinic receptor antagonist which induces memory deficits. Utilizing similar methods, the present study employed a two-trial novel object discrimination task to determine the acute effect of a neurotensin peptide analogue with improved metabolic stability, PD149163, on recognition memory in Lister hooded rats. Consistent with previous findings with neurotensin, animals receiving an intracerebroventricular injection of PD149163 (3 μg) significantly discriminated the novel from familiar object during the choice trial. In addition, a similar dose of PD149163 restored the scopolamine-induced deficit in novelty recognition. The restoration effect on scopolamine-induced amnesia produced by PD149163 was blocked by SR142948A, a nonselective neurotensin receptor antagonist, at a dose of 1 mg/kg (intraperitonial) but not at 0.1 mg/kg. In conclusion, the present results confirm a role for neurotensin in mediating memory processes, possibly via central cholinergic mechanisms.
KW - Cholinergic pathways
KW - Memory
KW - Neurotensin
KW - PD149163
KW - Rat
KW - SR142948A
UR - http://www.scopus.com/inward/record.url?scp=33747456246&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33747456246&partnerID=8YFLogxK
U2 - 10.1097/01.fbp.0000224382.63744.20
DO - 10.1097/01.fbp.0000224382.63744.20
M3 - Article
C2 - 16914954
AN - SCOPUS:33747456246
VL - 17
SP - 357
EP - 362
JO - Behavioural Pharmacology
JF - Behavioural Pharmacology
SN - 0955-8810
IS - 4
ER -