Abstract
A recombinant human parathyroid hormone fragment, Pro-Pro-[Arg 11]hPTH(1–34)-Pro-Pro (MW = 4550 Da), was developed by substituting Arg for Leu at position 11 and adding Pro-Pro at the carboxyl terminus. Following a single injection (0.5–13.5 μg/bird) of the rhPTH fragment, the serum calcium level in chickens increased 12–42% ( P < 0.05) after 1 h as determined by the Parson’s Chicken Assay. The functional activity of Pro-Pro-[Arg 11]hPTH(1–34)-Pro-Pro may be due to removal of the N-terminus Pro-Pro- by X-prolyl dipeptidyl peptidase IV (DPPIV) in vivo, increasing its activity compared to Pro-Pro-hPTH(1–34). This artificial rhPTH fragment could be used to increase calcium mobilization and potentially improve bone health.
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