Serotonin (5-HT1c) receptors in pig choroid plexus. |
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| Authors: | K T Yiin C F Chen J S Kuo C T Tsou J J Wang Y M Song S H Lin L N Tseng Y S Wang W H Lin |
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| Institution: | Department of Internal Medicine, Veterans General Hospital-Taichung, Taiwan, R.O.C. |
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| Abstract: | It is very important to find suitable reaction conditions to attain a high specific binding (specific/total binding) in the receptor binding study. Membrane homogenates of pig choroid plexus are known to have exclusively serotonin (5-hydroxytryptamine, 5-HT) receptor of the subtype 5-HT1c. In this study, we used the membrane preparation of pig choroid plexus tissue and the specific binding of 3H]5-HT was 72-84% to serotonin receptor subtype 5-HT1c, as defined by the inhibition of 1 uM 5-HT, when a radioligand concentration of 0.5 nM of 3H]5-HT was used in the assay. Analysis of the properties of specific 3H]5-HT binding in pig choroid plexus tissue membrane preparation revealed linear Scatchard plots. In Tris-HCl buffer without CaCl2, pargyline or ascorbic acid, high average of affinity dissociation constant (Kd) of 1.3 +/- 0.2 nM (SEM, n = 4) and also a high average of receptor density (Bmax) of 284 +/- 12 fmol/mg of protein were found. Pig choroid plexus proves to be a good material for 5-HT1c receptor binding study. |
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