A beta-arrestin-biased agonist of the parathyroid hormone receptor (PTH1R) promotes bone formation independent of G protein activation.

Published

Journal Article

About 40% of the therapeutic agents in use today exert their effects through seven-transmembrane receptors (7TMRs). When activated by ligands, these receptors trigger two pathways that independently transduce signals to the cell: one through heterotrimeric GTP-binding proteins (G proteins) and one through beta-arrestins; so-called biased agonists can selectively activate these distinct pathways. Here, we investigate selective activation of these pathways through the use of a biased agonist for the type 1 parathyroid hormone (PTH)-PTH-related protein receptor (PTH1R), (D-Trp(12),Tyr(34))-PTH(7-34) (PTH-betaarr), which activates beta-arrestin but not classic G protein signaling. In mice, PTH-betaarr induces anabolic bone formation, as does the nonselective agonist PTH(1-34), which activates both mechanisms. In beta-arrestin2-null mice, the increase in bone mineral density evoked by PTH(1-34) is attenuated and that stimulated by PTH-betaarr is ablated. The beta-arrestin2-dependent pathway contributes primarily to trabecular bone formation and does not stimulate bone resorption. These results show that a biased agonist selective for the beta-arrestin pathway can elicit a response in vivo distinct from that elicited by nonselective agonists. Ligands with these properties may form the basis for improved 7TMR-directed pharmacologic agents with enhanced therapeutic specificity.

Full Text

Duke Authors

Cited Authors

  • Gesty-Palmer, D; Flannery, P; Yuan, L; Corsino, L; Spurney, R; Lefkowitz, RJ; Luttrell, LM

Published Date

  • October 7, 2009

Published In

Volume / Issue

  • 1 / 1

Start / End Page

  • 1ra1 -

PubMed ID

  • 20368153

Pubmed Central ID

  • 20368153

Electronic International Standard Serial Number (EISSN)

  • 1946-6242

Digital Object Identifier (DOI)

  • 10.1126/scitranslmed.3000071

Language

  • eng

Conference Location

  • United States