Seven analogs which contain D-amino acids or the sterically hindered amino acid Pro, and two short-chain analogs of neo-kyotorphin (1), an analgesic pentapeptide isolated from bovine brain, were synthesized by the conventional method and screened for analgesic activity. All the analogs exhibited significantly enhanced analgesic effect upon intracisternal administration in mice. In particular, [D-Ser2]-and [Pro2]-neo-kyotorphin exhibited almost 10 times more potent activity than neo-kyotorphin.
采用传统方法合成了七种含有 D-氨基酸或立体受阻氨基酸 Pro 的类似物,以及从牛脑中分离出的镇痛五肽--新基吗啡(1)的两种短链类似物,并对其镇痛活性进行了筛选。所有类似物在小鼠鞘内给药时都表现出明显增强的镇痛效果。其中,[D-Ser2]-和[Pro2]-新基吗啡的活性几乎是新基吗啡的 10 倍。