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  • Title: Selective solubilization of physalaemin-type substance P binding sites from rat brain membranes by glycodeoxycholate and NaCl.
    Author: Maruyama M.
    Journal: Brain Res; 1986 Apr 02; 370(1):186-90. PubMed ID: 3011190.
    Abstract:
    Active substance P binding sites were solubilized from rat brain membranes by treatment with 0.125% sodium glycodeoxycholate and 1 M NaCl. About 50% of the binding activity in membrane-bound binding sites was recovered in the solubilized fraction after centrifugation at 105,000 g for 1 h. [3H]Substance P absorbed extensively to glass tubes and glass filters, but the absorption was greatly reduced by siliconizing glass tubes and preincubating glass filters in a solution containing poly-D-lysine and bovine serum albumin. [3H]Substance P was found to bind the solubilized receptors in a saturable fashion with a Bmax of 145 fmol/mg protein and a Kd of 4.6 nM, and these bindings were completely replaced by low concentrations of unlabeled substance P and physalaemin.
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