title: cAMP decreases steady-state levels of delta-opioid receptor mRNA in NG108-15 cells.
abstract: We have compared several drug combinations for their ability to increase basal cAMP and to down-regulate delta-opioid receptor mRNA levels. Continuous treatment for up to 48 h with a phosphodiesterase inhibitor in combination with the adenylyl cyclase activator forskolin showed an early peak response, but cAMP levels returned to control after 8 and 24 h. Increases in cAMP level up to 150-fold were observed after treatment for 1 h with a series of drugs (rolipram, IBMX/forskolin, rolipram/forskolin, dibutyryl cAMP, and prostaglandin E2) that increase cAMP by different mechanisms. A significant decrease in DOR mRNA level, to 31% of control, followed the three treatments that produced the largest increases in cAMP level: IBMX/forskolin, rolipram/forskolin, and prostaglandin E2.
authors.affiliation: Department of Psychiatry and Biobehavioural Sciences, UCLA-NPI 90024-1759, USA.
authors.forename: K H
authors.initials: KH
authors.lastname: Gylys
authors.forename: N
authors.initials: N
authors.lastname: Tran
authors.forename: K
authors.initials: K
authors.lastname: Magendzo
authors.forename: P
authors.initials: P
authors.lastname: Zaki
authors.forename: C J
authors.initials: CJ
authors.lastname: Evans
mesh_terms: D015056:1-Methyl-3-isobutylxanthine / Q000494:pharmacology; D000818:Animals; D005576:Colforsin / Q000494:pharmacology; D000242:Cyclic AMP / Q000378:metabolism*; D015232:Dinoprostone / Q000494:pharmacology; D009447:Neuroblastoma / Q000378:metabolism; D010726:Phosphodiesterase Inhibitors / Q000494:pharmacology*; D011760:Pyrrolidinones / Q000494:pharmacology; D012333:RNA, Messenger / Q000378:metabolism; D017465:Receptors, Opioid, delta / Q000187:drug effects / Q000378:metabolism*; D020889:Rolipram
chemical_list: D010726:Phosphodiesterase Inhibitors; D011760:Pyrrolidinones; D012333:RNA, Messenger; D017465:Receptors, Opioid, delta; D005576:Colforsin; D000242:Cyclic AMP; D020889:Rolipram; D015232:Dinoprostone; D015056:1-Methyl-3-isobutylxanthine