This invention relates to the field of
biomedicine, disclosing a long-acting pTH polypeptide compound and its preparation and application. The polypeptide has an octadecanoic acid or eicosanoic acid and its derivatives modified by at least one
amino acid residue at the 13th, 26th, and 27th
amino acid residues of the pTH (1-34) parent
peptide sequence, and is covalently bound to the polypeptide backbone via an AEEA-AEEA-γ-Glu
linker. This invention significantly enhances the
binding ability of the polypeptide to
serum albumin and prolongs its half-life by utilizing
fatty acid side chain modification. The long-acting pTH polypeptide compound of this invention exhibits significant osteogenic activity, promoting the proliferation of MC3T3-E1 cells and generating osteogenic markers and
calcium nodules under osteogenic induction conditions, with a 2-6 fold increase in
binding ability to
serum albumin. This invention also provides a
solid-
phase synthesis method for this polypeptide compound and a pharmaceutical composition containing it, which can be used to treat
osteoporosis and
hypoparathyroidism, effectively solving the compliance problem of existing drugs requiring daily injections.