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. 1990 Apr;99(4):767–773. doi: 10.1111/j.1476-5381.1990.tb13004.x

Pharmacological analysis of [3H]-senktide binding to NK3 tachykinin receptors in guinea-pig ileum longitudinal muscle-myenteric plexus and cerebral cortex membranes.

S Guard 1, S P Watson 1, J E Maggio 1, H P Too 1, K J Watling 1
PMCID: PMC1917550  PMID: 1694464

Abstract

1. The binding properties and pharmacological specificity of the selective NK3 tachykinin receptor agonist [3H))-senktide [( 3H]-succinyl[Asp6,MePhe8] substance P (6-11] have been examined in homogenates of guinea-pig ileum longitudinal muscle-myenteric plexus (LM/MP) and cerebral cortex. 2. Scatchard analysis of saturation binding studies in guinea-pig ileum LM/MP and cerebral cortex membranes indicated that [3H]-senktide bound to a single site with apparent high affinity, KD = 2.21 +/- 0.65 nM; Bmax = 13.49 +/- 0.04 fmol mg-1 protein in ileum and KD = 8.52 +/- 0.45 nM; Bmax = 76.3 +/- 1.6 fmol mg-1 protein in cortex (values are means +/- ranges; n = 2). 3. The pharmacological profile for tachykinins and analogues in displacing [3H]-senktide from ileum membranes was: [MePhe7] neurokinin B greater than neurokinin B (NKB) congruent to senktide greater than eledoisin greater than substance P (SP) greater than neurokinin A(NKA) greater than physalaemin greater than [Sar9,Met(O2)11]SP greater than [Nle10]NKA(4-10) = [Glp6,L-Pro9]-SP(6-11) greater than substance P methyl ester, consistent with [3H]-senktide binding to an NK3 subtype of tachykinin receptor. A similar rank order of affinity was obtained for these peptides in displacing [3H]-senktide from cortex membranes. 4. Several tachykinin receptor agonists were tested for their ability to displace [3H]-senktide from ileal and cortical NK3 binding sites and were found to be either weak displacers (pIC50 less than 5.00) or inactive.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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