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- W1987934444 abstract "Analogues of angiotensin II with cyclohexylalanine (Cha) at position 4 or 8, and analogues of the competitive (type II) angiotensin antagonist [Sar1,Tyr(Me)4]ANG II (Sarmesin) with Cha at position 8, have been prepared by the solid phase method and purified by reversed-phase HPLC. Analogues of ANG II with Cha at position 8 in which the position 1 residue was substituted with sarcosine (Sar) or amino-isobutyric acid (Aib) or was deleted (Des), were slowly reversing (Type I) antagonists with pA2 values in the rat isolated uterus assay of approximately 8.5. The additional substitution of Tyr(Me) for Tyr at position 4 of these peptides gave reversible competitive (Type I/II) antagonists with pA2 values of 6.7, 5.8, and less than 5, while substitution of Phe for Tyr gave pA2 values of 7.4, 6.7, and less than 5, respectively. All 19 peptides synthesized in this study had low intrinsic agonist activity in the rat isolated uterus assay except for the type I antagonists [Sar1, Cha8]ANG II (7%), [Aib1, Cha8]ANG II (12%) and [Des1, Cha8]ANG II (20%). These data illustrate that the substitution of Cha at position 8 of ANG II analogues produces potent antagonists; however, Type I antagonists retain significant agonist activity whereas Type I/II antagonists do not. In contrast, substitution of Cha at position 4 in a variety of ANG II analogues resulted in severely diminished biological activity, illustrating that the presence of an aromatic ring quadrupole at position 4 is obligatory for receptor binding and activity." @default.
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- W1987934444 date "2009-01-12" @default.
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- W1987934444 title "Synthesis and biological activities of angiotensin II and Sarmesin analogues containing cyclohexylalanine" @default.
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- W1987934444 doi "https://doi.org/10.1111/j.1399-3011.1991.tb00728.x" @default.
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