title: Effect of synthetic oligopeptides on osteoporosis.
abstract: The objective of this study was to establish the solution method of GHRPS, the synthetic oligopeptides Tyr-Gly-Gly-Phe-Met-NH2, Tyr-Gly-Gly-Phe-Met-OH, Tyr-Gly-Gly-Phe-Leu-NH2, Tyr-Gly-Gly-Phe-Leu-OH, Tyr-Gly-Gly-Phe-Gly-NH2, and Tyr-Gly-Gly-Phe-Gly-OH, to verify their effect on osteoporosis. Male ICR mice (20+/-2 g) were used. The intramuscular injection dose of 6.3 mg/kg prednisone induced a significant decrease of body and femur weight of the animals. The subcutaneous injection dose of 18 microg/kg synthetic peptide was not effective to prevent the decrease of body and femur weight of the animals. The subcutaneous injection dose of 6.3 mg/kg prednisone elicited a decrease in content of femur calcium and in the level of serum calcium of the animals. The subcutaneous injection dose of 18 microg/kg Tyr-Gly-Gly-Phe-Leu-NH2, or Tyr-Gly-Gly-Phe-Leu-OH, or Tyr-Gly-Gly-Phe-Gly-NH2 significantly increased the content of femur calcium and decreased the level of serum calcium of the animals. It was also observed that the subcutaneous injection dose of 18 microg/kg Tyr-Gly-Gly-Phe-Gly-OH, Tyr-Gly-Gly-Phe-Leu-OH, Tyr-Gly-Gly-Phe-Met-OH, Tyr-Gly-Gly-Phe-Met-NH2 significantly increased the content of femur phosphorous and decreased the activity of ALP of the animals.
authors.affiliation: College of Pharmaceutical Sciences, Peking University, Beijing, PR China.
authors.forename: Weina
authors.initials: W
authors.lastname: Cui
authors.forename: Chao
authors.initials: C
authors.lastname: Wang
authors.forename: Ming
authors.initials: M
authors.lastname: Zhao
authors.forename: Shiqi
authors.initials: S
authors.lastname: Peng
mesh_terms: D000818:Animals; D001842:Bone and Bones / Q000187:drug effects; D002118:Calcium / Q000097:blood; D013007:Growth Hormone-Releasing Hormone / Q000031:analogs & derivatives / Q000235:genetics / Q000494:pharmacology; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D009842:Oligopeptides / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D010024:Osteoporosis / Q000188:drug therapy*
chemical_list: D009842:Oligopeptides; D013007:Growth Hormone-Releasing Hormone; D002118:Calcium