Regulation of adenylyl cyclase isozymes on acute and chronic activation of inhibitory receptors

Igal Nevo, Tomer Avidor-Reiss, Rivka Levy, Michael Bayewitch, Eli Heldman, Zvi Vogel

Research output: Contribution to journalArticlepeer-review

60 Scopus citations


Adenylyl cyclase superactivation, a phenomenon by which chronic activation of inhibitory G(i/o)-coupled receptors leads to an increase in cAMP accumulation, is believed to play an important role as a compensatory response of the cAMP signaling system in the cell. However, to date, the mechanism by which adenylyl cyclase activity is regulated by chronic exposure to inhibitory agonists and the nature of the adenylyl cyclase isozymes participating in this process remain largely unknown. Here we show, using COS-7 cells transfected with the various AC isozymes, that acute activation of the D2 dopaminergic and m4 muscarinic receptors inhibited the activity of adenylyl cyclase isozymes I, V, VI, and VIII, whereas types II, IV, and VII were stimulated and type III was not affected. Conversely, chronic receptor activation led to superactivation of adenylyl cyclase types I, V, VI, and VIII and to a reduction in the activities of types II, IV, and VII. The activity of AC-III also was reduced. This pattern of inhibition/stimulation of the various adenylyl cyclase isozymes is similar to that we recent y observed on acute and chronic activation of the μ-opioid receptor, suggesting that isozyme-specific adenylyl cyclase superactivation may represent a general means of cellular adaptation to the activation of inhibitory receptors and that the presence/absence and intensity of the adenylyl cyclase response in different brain areas (or cell types) could be explained bY the expression of different adenylyl cyclase isozyme types in these areas.

Original languageEnglish
Pages (from-to)419-426
Number of pages8
JournalMolecular Pharmacology
Issue number2
StatePublished - 1 Jan 1998
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Medicine
  • Pharmacology


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