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2015 ; 67
(2
): 310-37
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International Union of Basic and Clinical Pharmacology XCIII The parathyroid
hormone receptors--family B G protein-coupled receptors
#MMPMID25713287
Gardella TJ
; Vilardaga JP
Pharmacol Rev
2015[]; 67
(2
): 310-37
PMID25713287
show ga
The type-1 parathyroid hormone receptor (PTHR1) is a family B G protein-coupled
receptor (GPCR) that mediates the actions of two polypeptide ligands; parathyroid
hormone (PTH), an endocrine hormone that regulates the levels of calcium and
inorganic phosphate in the blood by acting on bone and kidney, and PTH-related
protein (PTHrP), a paracrine-factor that regulates cell differentiation and
proliferation programs in developing bone and other tissues. The type-2
parathyroid hormone receptor (PTHR2) binds a peptide ligand, called
tuberoinfundibular peptide-39 (TIP39), and while the biologic role of the
PTHR2/TIP39 system is not as defined as that of the PTHR1, it likely plays a role
in the central nervous system as well as in spermatogenesis. Mechanisms of action
at these receptors have been explored through a variety of pharmacological and
biochemical approaches, and the data obtained support a basic "two-site" mode of
ligand binding now thought to be used by each of the family B peptide hormone
GPCRs. Recent crystallographic studies on the family B GPCRs are providing new
insights that help to further refine the specifics of the overall receptor
architecture and modes of ligand docking. One intriguing pharmacological finding
for the PTHR1 is that it can form surprisingly stable complexes with certain
PTH/PTHrP ligand analogs and thereby mediate markedly prolonged cell signaling
responses that persist even when the bulk of the complexes are found in
internalized vesicles. The PTHR1 thus appears to be able to activate the
G?(s)/cAMP pathway not only from the plasma membrane but also from the endosomal
domain. The cumulative findings could have an impact on efforts to develop new
drug therapies for the PTH receptors.
|*Models, Molecular
[MESH]
|*Second Messenger Systems
[MESH]
|Animals
[MESH]
|Cell Membrane/enzymology/metabolism
[MESH]
|Cyclic AMP/*physiology
[MESH]
|Endosomes/enzymology/metabolism
[MESH]
|GTP-Binding Protein alpha Subunits, Gs/chemistry/*metabolism
[MESH]