作者:Victor J. Hruby、Brian C. Wilkes、Mac E. Hadley、Fahad Al-Obeidi、Tomi K. Sawyer、Douglas J. Staples、Ann E. DeVaux、Orin Dym、Ana Maria de L. Castrucci
DOI:10.1021/jm00394a033
日期:1987.11
yielded the peptide, Ac-alpha-MSH4-12-NH2 with a 360-fold increase in potency relative to Ac-alpha-MSH4-10-NH2. This peptide was only about 6-fold less potent than alpha-MSH. A series of Nle-4-substituted analogues also were prepared. Ac-[Nle4]-alpha-MSH4-10-NH2 was about 4 times more potent than Ac-alpha-MSH4-10-NH2. Ac-[Nle4]-alpha-MSH4-11-NH2 also was about 4 times more potent than Ac-alpha-MSH4-10-NH2
在青蛙(Rpi pipiens)皮肤生物测定中确定了α-MSH(α-促黑素,α-黑素细胞刺激激素)的生物学活性所需的最小序列。引发可测量的生物学活性所需的序列是中央四肽序列Ac-His-Phe-Arg-Trp-NH2(Ac-alpha-MSH6-9-NH2),其效力比天然三肽低约6个数量级。 。此序列的较小片段(Ac-His-Phe-NH2,Ac-Phe-Arg-NH2,Ac-His-Phe-Arg-NH2)在高达10(-4)M的浓度下均不具有黑色素活性。无法证明四肽Ac-Phe-Arg-Trp-Gly-NH2(Ac-alpha-MSH7-10-NH2)和包括Ac-Lys-Pro-Val-NH2( Ac-alpha-MSH11-13-NH2)。我们准备了一系列α-MSH的片段类似物,以试图确定每个氨基酸对天然激素的生物学活性的贡献。通过在C末端添加甘氨酸,可将Ac-alpha-MSH6-9