cAMP binding proteins in the rat cerebral cortex after administration of selective 5-HT and NE reuptake blockers with antidepressant activity.
This study was undertaken to evaluate the cyclic adenosine monophosphate (cAMP) binding proteins in the cerebral cortex of rat after short- and long-term administration with antidepressants. Prolonged treatment with different antidepressants that inhibit serotonin or norepinephrine uptake such as fluoxetine and the (+) enantiomer of oxaprotiline, respectively, was able to induce an increase in the photoactivated incorporation of 8-N3-[32P]cAMP into a protein band with apparent molecular weight of 52,000 in both soluble and crude microtubule fraction. On the contrary, chronic treatment with the (-) enantiomer of oxaprotiline, which does not affect monoamine uptake, failed to produce this effect. Moreover, no changes were observed after acute or in vitro addition of antidepressants, suggesting that modification in the cAMP binding may be related to adaptive changes elicited by prolonged antidepressants treatment. In conclusion, our studies indicate that the cAMP binding protein associated with the crude microtubule fraction could be an intracellular target for the action of antidepressant drugs.
Perez
J
J
Center of Neuropharmacology, University of Milan, Italy.
Tinelli
D
D
Bianchi
E
E
Brunello
N
N
Racagni
G
G
D000345:Affinity Labels / Q000378:metabolism; D000818:Animals; D001386:Azides / Q000378:metabolism; D002540:Cerebral Cortex / Q000187:drug effects / Q000378:metabolism*; D000242:Cyclic AMP / Q000031:analogs & derivatives / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D005473:Fluoxetine / Q000494:pharmacology*; D008297:Male; D008376:Maprotiline / Q000031:analogs & derivatives* / Q000494:pharmacology; D008870:Microtubules / Q000187:drug effects / Q000378:metabolism; D008970:Molecular Weight; D009638:Norepinephrine / Q000037:antagonists & inhibitors / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D011953:Receptors, Cyclic AMP / Q000187:drug effects / Q000302:isolation & purification / Q000378:metabolism*; D012702:Serotonin Antagonists / Q000494:pharmacology*; D013237:Stereoisomerism
D000345:Affinity Labels; D001386:Azides; D011953:Receptors, Cyclic AMP; D012702:Serotonin Antagonists; D005473:Fluoxetine; D008376:Maprotiline; C017042:8-azidoadenosine-3',5'-monophosphate; C027299:hydroxymaprotilin; D000242:Cyclic AMP; D009638:Norepinephrine