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Pharmacology. 2009;83(4):247-58. doi: 10.1159/000209254. Epub 2009 Mar 19.

Segment-dependent activation of muscarinic acetylcholine receptor-mediated [35S]Guanosine-5'-O-(gamma-thiotriphosphate) binding in airway tissue membranes.

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Institute of Pharmacology, Pharmacy and Toxicology, Leipzig University, Leipzig, Germany.


Muscarinic acetylcholine receptor (mAChR)-mediated guanine nucleotide-binding regulatory protein (G protein) activation and the functional interaction between receptors and the respective G proteins were investigated using an agonist-induced [(35)S]guanosine-5'-O-(gamma-thiotriphosphate) ([(35)S]GTPgammaS)-binding approach in membranes of 3 native equine airway segments (trachea, bronchus and lung), which differ tremendously in mAChR density and subtype distribution; especially subtypes that couple negatively to adenylyl cyclase through G(i/0) proteins, i.e. M(2) receptors. The assay was initially optimized by determining the influence of incubation time, guanosine 5'-diphosphate (GDP), MgCl(2) and NaCl on basal and agonist-stimulated [(35)S]GTPgammaS binding. In standard assays, the presence of 10 mumol/l GDP, 10 mmol/l MgCl(2) and 200 mmol/l NaCl increased carbachol-induced specific [(35)S]GTPgammaS binding in a segment- and receptor-density-dependent manner. Hereby, mAChR agonists stimulated [(35)S]GTPgammaS binding with a rank order of potency (oxotremorine M > carbachol > acetylcholine), and in a specific segment- and receptor-density-dependent manner (trachea > bronchus > lung). The increase in the specific [(35)S]GTPgammaS binding was potently inhibited by the mAChR antagonist atropine. Pertussis toxin and N-ethylmaleimide as G(i/0) protein ADP-ribosylating and alkylating agents reduced basal and agonist-stimulated [(35)S]GTPgammaS binding. The mAChR-stimulated [(35)S]GTPgammaS binding serves as a useful method for investigating the functional interaction between mAChRs and their respective G proteins in native airway tissue membranes of equines.

[Indexed for MEDLINE]

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