Dual effects of muscarinic M2 receptors on the synthesis of cyclic AMP in CHO cells: background and model.
It has been observed in several laboratories that muscarinic agonists have dual effects on the synthesis of cyclic AMP in cell lines expressing muscarinic M2 or M4 receptors, producing strong inhibition at low agonist concentrations and lesser inhibition or stimulation at high agonist concentrations. Data obtained on CHO cells (known to express adenylyl cyclases VI and VII) are best interpreted on the assumption that the upward phase of the concentration-response curves reflects simultaneous inhibition of adenylyl cyclase VI via the Gi proteins, with which the M2 and M4 receptors communicate with high affinity, and stimulation of adenyly cyclases VI and VII via the Gs proteins, with which the M2 and M4 receptors communicate with low affinity. A simplified model is described which permits one to predict how the shapes of the concentration-response curves will be affected by changes in the concentration of receptors, the affinities of activated receptors for Gi or Gs proteins, and other parameters.
Tucek
S
S
Institute of Physiology, Academy of Sciences, Prague, Czech Republic. tucek@biomed.cas.cz
Michal
P
P
Vlachova
V
V
D000262:Adenylyl Cyclases / Q000378:metabolism*; D000818:Animals; D016466:CHO Cells; D006224:Cricetinae; D000242:Cyclic AMP / Q000096:biosynthesis*; D004305:Dose-Response Relationship, Drug; D019206:GTP-Binding Protein alpha Subunits, Gi-Go / Q000378:metabolism; D019205:GTP-Binding Protein alpha Subunits, Gs / Q000378:metabolism; D007700:Kinetics; D008433:Mathematics; D008954:Models, Biological; D043585:Receptor, Muscarinic M2; D043588:Receptor, Muscarinic M4; D011976:Receptors, Muscarinic / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology
D043585:Receptor, Muscarinic M2; D043588:Receptor, Muscarinic M4; D011976:Receptors, Muscarinic; D000242:Cyclic AMP; D019206:GTP-Binding Protein alpha Subunits, Gi-Go; D019205:GTP-Binding Protein alpha Subunits, Gs; D000262:Adenylyl Cyclases