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Na+/H+ exchanger regulatory factor 2 directs parathyroid hormone 1 receptor signalling


The parathyroid hormone 1 receptor (PTH1R) is a class II G-protein-coupled receptor1. PTH1R agonists include both PTH, a hormone that regulates blood calcium and phosphate, and PTH-related protein (PTHrP), a paracrine/autocrine factor that is essential for development, particularly of the skeleton. Adenylyl cyclase activation is thought to be responsible for most cellular responses to PTH and PTHrP, although many actions appear to be independent of adenylyl cyclase1,2,3,4,5. Here we show that the PTH1R binds to Na+/H+ exchanger regulatory factors (NHERF) 1 and 2 through a PDZ-domain interaction in vitro and in PTH target cells. NHERF2 simultaneously binds phospholipase Cβ1 and an atypical, carboxyl-terminal PDZ consensus motif, ETVM, of the PTH1R through PDZ1 and PDZ2, respectively. PTH treatment of cells that express the NHERF2–PTH1R complex markedly activates phospholipase Cβ and inhibits adenylyl cyclase through stimulation of inhibitory G proteins (Gi/o proteins). NHERF-mediated assembly of PTH1R and phospholipase Cβ is a unique mechanism to regulate PTH signalling in cells and membranes of polarized cells that express NHERF, which may account for many tissue- and cell-specific actions of PTH/PTHrP and may also be relevant to signalling by many G-protein-coupled receptors.

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Figure 1: In vitro interactions of PTH1R and NHERF1 and 2 are PDZ-domain specific.
Figure 2: NHERF2 directs PTH1R signalling by assembling PTH1R-PLCβ complexes.
Figure 3: NHERF-PTH1R interactions and signalling in PTH targets.


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We thank D. Moore for providing the pT7-hismyc vector; S. Goo Rhee for providing the cDNA for PLCβ1; V. Ramesh for the NHERF1 cDNA; and C. Isales for providing the ECV304 cells. We also would like to thank J. Potts and H. Kronenberg for their helpful discussions and review of the manuscript. This work was supported in part by the NIH (G.V.S.).

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Correspondence to Gino V. Segre.

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Mahon, M., Donowitz, M., Yun, C. et al. Na+/H+ exchanger regulatory factor 2 directs parathyroid hormone 1 receptor signalling. Nature 417, 858–861 (2002).

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