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Assay Method Information

Assay Name:  Radioligand Binding Assay
Description:  Radioligand binding assays for cloned muscarinic receptors were performed in 96-well microtiter plates in a total assay volume of 100 uL. CHO cell membranes stably expressing either the hM1, hM2, hM3, hM4 or hM5 muscarinic subtype were diluted in assay buffer to the following specific target protein concentrations (ug/well): 10 ug for hM1, 10-15 ug for hM2, 10-20 ug for hM3, 10-20 ug for hM4, and 10-12 ug for hM5 to get similar signals (cpm). The membranes were briefly homogenized using a Polytron tissue disruptor (10 seconds) prior to assay plate addition.Saturation binding studies for determining KD values of the radioligand were performed using L-[N-methyl-3H]scopolamine methyl chloride ([3H]-NMS) (TRK666, 84.0 Ci/mmol, Amersham Pharmacia Biotech, Buckinghamshire, England) at concentrations ranging from 0.001 nM to 20 nM.Displacement assays for determination of Ki values of test compounds were performed with [3H]-NMS at 1 nM.
Affinity data for this assay
 

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Last update November 1, 2007
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