the physiological activity of the peptide and the effectiveness of the two control system containing calcium metabolism.

摘要

A novel physiologically active peptide having the amino acid sequence (I) wherein X1 stands for Ser-Thr or Thr-Ser, X2 stands for Met, Gly, Ala, Val, n-Val, Pro, Leu, n-Leu, Ile, Phe or α-aminolactic acid, X3 stands for Asp or Glu, X4 stands for Leu-Gln-Thr, Gln-Thr, Leu or Gly-Gln-Thr, X5 stands for Val-Gly-Ala or Ser-Gly-Thr, R stands for H, NH2, N-acyl or N-aklyl, X6 sands for CO-NH or NH-CO, X7 stands for an amino acid sequence at the 2- to 6-positions of native calcitonin, or a substitution, deletion or addition derivative thereof, having 0 to 6 amino acids, X8 stands for an amino acid sequence at the 8- to 32-positions of native calcitonin, or a substitution, deletion or addition derivative thereof, and each of n1 and n2 is an integer or 1 to 19 and n1 + n2 is 2 to 20, or a pharmacologically acceptable salt thereof, and a calcium metabolism-regulating agent comprising, as an effective ingredient, the above-mentioned peptide or salt.