title: Forskolin evokes extracellular adenosine accumulation in rat cortical cultures.
abstract: In this study, the effect on extracellular adenosine concentration of direct activation of adenylyl cyclase by forskolin was investigated using rat cortical cultures. Forskolin evoked intracellular and extracellular cAMP accumulation as well as extracellular adenosine accumulation. The accumulation of adenosine in response to forskolin could be blocked by the cyclic nucleotide phosphodiesterase inhibitor 4-[(3-butoxy-4-methoxyphenyl)methyl]-2-imidazolidinone (RO 20-1724; 180 microM), but not isobutylmethylxanthine (100 microM). The accumulation of adenosine in response to forskolin could be blocked by the 5'-ectonucleotidase inhibitor guanosine 5'-monophosphate. These results demonstrate that forskolin can increase extracellular adenosine levels, and that this adenosine is ultimately derived from cAMP.
authors.affiliation: Department of Neurology and Program in Neuroscience, Children's Hospital, Boston, MA 02115, USA.
authors.forename: P A
authors.initials: PA
authors.lastname: Rosenberg
authors.forename: Y
authors.initials: Y
authors.lastname: Li
mesh_terms: D015106:3',5'-Cyclic-GMP Phosphodiesterases / Q000037:antagonists & inhibitors; D000241:Adenosine / Q000378:metabolism*; D000262:Adenylyl Cyclases / Q000378:metabolism; D000318:Adrenergic beta-Agonists / Q000494:pharmacology; D000818:Animals; D002478:Cells, Cultured; D002540:Cerebral Cortex / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism*; D005576:Colforsin / Q000494:pharmacology*; D000242:Cyclic AMP / Q000378:metabolism; D004594:Electrophysiology; D005110:Extracellular Space / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism; D009479:Neuropeptides / Q000494:pharmacology; D051381:Rats
chemical_list: D000318:Adrenergic beta-Agonists; D009479:Neuropeptides; D005576:Colforsin; D000242:Cyclic AMP; D015106:3',5'-Cyclic-GMP Phosphodiesterases; D000262:Adenylyl Cyclases; D000241:Adenosine