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Endocrinology. 1991 Dec;129(6):3424-6.

A potent inhibitor of osteoclastic bone resorption within a highly conserved pentapeptide region of parathyroid hormone-related protein; PTHrP[107-111].

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  • 1Dept of Medicine, University of Melbourne, Geelong Hospital, Victoria, Australia.

Abstract

We have recently shown that a carboxyl-terminal sequence of parathyroid hormone-related protein, PTHrP[107-139], is a potent direct inhibitor of osteoclastic bone resorption. We now report that this bone resorption inhibitory activity, which we have called osteostatin, is entirely contained within the highly conserved pentapeptide PTHrP[107-111]. Our results indicate that processing at residue 106 and a free amino terminus is required for full activity of the peptide. The retroinverted peptide is considerably less potent than the parent peptide. The retention of full biological activity in such a short fragment was unexpected. This data provides the basis for the development of further analogs with potential therapeutic use in disorders associated with increased osteoclastic bone resorption.

[PubMed - indexed for MEDLINE]
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