Effect of intraperitoneal mRNA antisense-oligodeoxynucleotides to cholecystokinin on anxiety-like and learning behaviors in rats: association with pre-experimental stress.

Abstract:

RATIONALE:Cholecystokinin and its analogs generate anxiety in humans and measurable anxiety-like behaviors in rats. Cholecystokinin receptor blockers have been reported to have variable effects in the treatment of anxiety disorders. We demonstrated that intracerebroventricular administration of Cholecystokinin-antisense oligodeoxynucleotides (ASODN) for 3 days significantly diminished anxiety-like behavior in rats. OBJECTIVE:This study was designed to examine the effects of peripheral (intraperitoneal) administration of Cholecystokinin-ASODN on anxiety-like and learning behaviors in rats, in general and in a pre-experiment stress paradigm. METHODS:In the first study Cholecystokinin-ASODN was injected intraperitoneally to rats five times at 24-h intervals. Control groups received injections of either a scrambled oligodeoxynucleotide (ScrODN) or vehicle. On the sixth day, the rats were assessed in the elevated plus-maze paradigm and in the Morris water maze. In the second study, rats were pre-exposed to a cat for 10 min as a model for psychological stress, and then treated with intraperitoneal Cholecystokinin-ASODN and tested in both paradigms. RESULTS:The results show that for intact rats, intraperitoneal Cholecystokinin-ASODN significantly increased anxiety-like behavior and impaired retention performance in the Morris water maze, compared to both control groups. In stressed rats, Cholecystokinin-ASODN reduced anxiety-like behaviors in the plus-maze and improved performance in the water maze compared with controls. CONCLUSIONS:These results indicate that the anxiolytic effect of intraperitoneal Cholecystokinin-ASODN may be dependent on the baseline endogenous level of stress (i.e., on the Cholecystokinin levels). Basal endogenous levels of Cholecystokinin, as well as exogenous dosage of Cholecystokinin agonists and/or anxiolytic agents, appear to play an important role in the expression and/or control of anxiety-related behaviors in rats.

journal_name

Neuropeptides

journal_title

Neuropeptides

authors

Cohen H,Matar MA,Buriakovsky I,Zeev K,Kotler M,Bourin M

doi

10.1016/s0143-4179(02)00088-4

keywords:

subject

Has Abstract

pub_date

2002-10-01 00:00:00

pages

341-52

issue

5

eissn

0143-4179

issn

1532-2785

pii

S0143417902000884

journal_volume

36

pub_type

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