Neurotensin: specific binding to synaptic membranes from rat brain.

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Abstract
The binding of neurotensin to synaptic membranes from rat brain was studied at 24.degree. C with the use of [3H]-neurotensin. The binding was highly specific, saturable and reversible. Values for Kd of 2 nM and 0.9 nM were derived from equilibrium and kinetic experiments, respectively. Virtually no degradation of neurotensin was observed in the incubation medium after exposure to synaptic membranes under the conditions of the binding studies. Competitive inhibition of [3H]-neurotensin binding by partial sequences of neurotensin revealed that addition of the residue arginine-8 to the neurotensin-(9-13)-pentapeptide increases about 500-fold the relative binding potency, whereas the remaining portion of the NH2-terminal region is mainly responsible for full pharmacological potency; the COOH-terminal leucyl residue is essential for binding.