Dual effects of muscarinic M2 receptors on the synthesis of cyclic AMP in CHO cells: background and model

0142134 - FGU-C 20010188 RIV GB eng J - Journal Article
Tuček, Stanislav - Michal, Pavel - Vlachová, Viktorie
Dual effects of muscarinic M2 receptors on the synthesis of cyclic AMP in CHO cells: background and model.
Life Sciences. Roč. 68, 22-23 (2001), s. 2501-2510. ISSN 0024-3205. E-ISSN 1879-0631
R&D Projects: GA AV ČR IAA7011910; GA ČR GA309/99/0214
Institutional research plan: CEZ:AV0Z5011922
Keywords : muscarinic receptors * G proteins * adenylyl cyclase
Subject RIV: ED - Physiology
Impact factor: 1.758, year: 2001

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 adenylyl 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.
Permanent Link: http://hdl.handle.net/11104/0039843