The present invention is aimed at providing a novel peptide with quick expression of drug efficacy/effect and long duration of maintaining amelioration, a medicament or an external preparation comprising the same, in particular a prophylactic or therapeutic for dermatitis, skin roughness, rhinitis, alopecia or thinning hair, or a hair growth stimulant, hair growing agent, an antipruritic or a skin-care product, etc. The present invention has reached said object by providing a cyclic peptide having an amino acid sequence expressed by the formula I or a derivative thereof or a pharmaceutically acceptable salt thereof, wherein the amino acid sequence has no peptide bond other than those which are formed between the amino acids constituting the amino acid sequence.
本发明的目的是提供一种药效/效果表达快、维持改善时间长的新型
多肽,以及包含该
多肽的药物或外用制剂,特别是皮炎、皮肤粗糙、鼻炎、脱发或头发稀疏的预防或治疗药物,或毛发生长刺激剂、生发剂、止痒剂或护肤品等。本发明通过提供一种具有式 I 所表示的
氨基酸序列的环肽或其衍
生物或其药学上可接受的盐来达到上述目的,其中该
氨基酸序列除了在构成该
氨基酸序列的
氨基酸之间形成的肽键外没有其他肽键。