The invention provides stable metastin derivatives having excellent biological activities (a cancer metastasis suppressing activity, a cancer growth suppressing activity, etc.). By modifying the constituent amino acids of metastin with specific modifying groups, metastin derivatives having more improved blood stability, etc. than native metastin and showing excellent cancer metastasis suppressing activity or cancer growth suppressing activity have been found. Furthermore, it has been found that these metastin derivatives exhibit effects of suppressing gonadotropic hormone secretion, suppressing sex hormone secretion, etc., which are wholly different from the effects heretofore known.
该发明提供了稳定的metastin衍
生物,具有优异的
生物活性(抑制癌细胞转移的活性,抑制癌细胞生长的活性等)。通过用特定的修饰基团修饰metastin的组成
氨基酸,发现比天然的metastin具有更好的血液稳定性等,同时表现出优异的抑制癌细胞转移或抑制癌细胞生长的活性。此外,发现这些metastin衍
生物表现出抑制性腺激素分泌、抑制性激素分泌等完全不同于以往所知的效应。