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- W1538099669 abstract "Analogues of [Orn6]-SP6-11 have been synthesized in which the methionyl residue is replaced by glutamine gamma-carboxamide substituted derivatives. These analogues where tested in three in vitro preparations representative of NK-1, NK-2 and NK-3 receptor types. Substitution of the SCH3 group of the Met11 side chain by CONHCH3, CON(CH3)2, CONHPh and CONCH3Ph groups results in analogues which are full agonists in NK-1 and NK-2 preparations with the exception of the Glu[N(CH3)2]11 and the Glu(NHCH3)11 analogues, which are partial agonists at NK-1 and NK-2 receptors respectively. The Glu(NHCH3)11 analogue shows selectivity for the NK-1 receptor type and is equipotent to the Glu(NCH3Ph)11 analogue in the same receptor type. The latter analogue is 2.84 times more potent than the parent hexapeptide in the NK-2 preparation. The Glu(NHPh)11 analogue is a full agonist in the NK-3 preparation and equipotent to the parent hexapeptide, in contrast to the other analogues in which Met has been replaced by glutamine gamma-carboxamide substituted residues. It is concluded that for NK-1 receptor type the lipophilic character of Met11 side chain is not a determining factor for activity but it is an important factor for activity in the NK-2 receptor type and has a stronger effect when a phenyl group is present, thus leading to analogues which are full agonists and more potent than the parent hexapeptide." @default.
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- W1538099669 date "2009-01-12" @default.
- W1538099669 modified "2023-09-26" @default.
- W1538099669 title "Synthesis and biological activity of analogues of the C-terminal hexapeptide of substance P with modifications at glutaminyl and methioninyl residues" @default.
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- W1538099669 doi "https://doi.org/10.1111/j.1399-3011.1992.tb00316.x" @default.
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