A thymosin β4-like peptide, thymosin βMet9 isolated from pork spleen, was synthesized using a conventional solution method. The deprotection of the protected thymosin βMet9 was achieved by treatment with Zn-90% AcOH to remove C-terminal ρ-nitrobenzyl ester and then with 1 M trifluoromethanesulfonic acid-thioanisole (molar ratio, 1 : 1) in trifluoroacetic acid in the presence of dimethylselenium. Finally, the deprotected peptide was incubated with dithiothreitol to reduce sulfoxide on the methionine side chain.The increase of the E-rosette-forming lymphocytes was obtained after incubation of peripheral blood from lupus nephritis patients with the synthetic thymosin βMet9. The synthetic thymosin βMet9 was approximately equal in potency to that of our synthetic calf thymosin β9.
采用常规溶液法合成了从猪脾中分离的
胸腺素β4样肽——
胸腺素βMet9。受保护的
胸腺素βMet9的脱保护是通过用Zn-90% AcOH处理以去除C端对硝基苄酯,然后在
三氟乙酸中用1 M
三氟甲磺酸-
茴香硫醚(摩尔比,1:1)处理来实现的。
二甲基硒。最后,将脱保护的肽与二
硫苏糖醇一起温育,以还原甲
硫氨酸侧链上的亚砜。将狼疮性肾炎患者的外周血与合成的
胸腺素βMet9温育后,获得E-玫瑰花结形成淋巴细胞的增加。合成
胸腺素 βMet9 的效力与我们合成的小牛
胸腺素 β9 大致相同。