Various diseases such as osteoporosis, osteoarthritis and decubitus can effectively be suppressed by one or more peptide molecules selected from a group comprising EGDGHLGKPGROGE, EKDGHPGKPGROGE, G(POG)4, (POG)3, G(POG)2, (POG)2, (POG)4, (POG)5, G(POG)3 and pharmaceutically acceptable salts of these. The peptide molecules migrate readily into cells, are readily absorbed into the body in the intestinal tract, and strongly bind nucleic acid compounds and the like to form complexes, and thus function well as a carrier component for delivering nucleic acid compounds, without suffering from the problems associated with conventional DDS technology.
