Abstract:
RATIONALE:Rolipram, an inhibitor of cyclic AMP phosphodiesterase (PDE4) produces discriminative stimulus effects in rats. These effects may be related to a wide range of central nervous system effects described previously. OBJECTIVE:The purposes of the present study were to: (i) assess the specificity of the discriminative stimulus effects of rolipram; (ii) examine the role of beta adrenergic receptors; (iii) assess the effects of imipramine and nisoxetine; and (iv) determine whether SKF 38393, a compound which also increases cAMP levels, substitutes for rolipram. METHODS:Rats were trained to discriminate 0.1 mg/kg rolipram from its vehicle in a two-lever task. Following discrimination training, substitution and antagonism tests were carried out. RESULTS:In generalization tests, the PDE4 inhibitors ICI 63,197 and Ro 20-1724 substituted for rolipram in a dose-dependent manner (substitution at 0.3 mg/kg and 3 mg/kg, respectively). The selective inhibitors of PDE1, PDE2, and PDE5/6 did not substitute for rolipram; however, a dose of 10 mg/kg of the PDE3 inhibitor milrinone did substitute. The beta adrenergic agonists clenbuterol and dobutamine at least partially substituted for rolipram (0.1 mg/kg and 18 mg/kg, respectively). By contrast, the D1 dopaminergic agonist SKF 38393 and the monoamine uptake inhibitors imipramine and nisoxetine were ineffective (at doses up to 3, 10, and 10 mg/kg, respectively). CONCLUSIONS:The present results indicate that the discriminative stimulus effects of rolipram are related to the inhibition of the hydrolytic activity of PDE4. Generalized increases in cyclic nucleotides do not appear to be sufficient for producing rolipram-like effects. It appears that a mechanism involving beta adrenergic receptors may contribute to the effects of rolipram, consistent with previous neuropharmacological data. Finally, the discriminative stimulus effects of rolipram appear to be unrelated to its antidepressant-like effect, but may provide a surrogate marker for central nervous system-related side effects of PDE4 inhibitors.
journal_name
Psychopharmacology (Berl)journal_title
Psychopharmacologyauthors
Makhay MM,Houslay MD,O'Donnell JMdoi
10.1007/s002130100878subject
Has Abstractpub_date
2001-11-01 00:00:00pages
297-304issue
3eissn
0033-3158issn
1432-2072journal_volume
158pub_type
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pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:2011-06-01 00:00:00
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pub_type: 杂志文章
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