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Allosteric Modulation of the Calcium-Sensing Receptor

The calcium (Ca(2+))-sensing receptor (CaR) belongs to family C of the G-protein coupled receptors (GPCRs). The receptor is activated by physiological levels of Ca(2+) (and Mg(2+)) and positively modulated by a range of proteinogenic L-α-amino acids. Recently, several synthetic allosteric modulators...

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Detalles Bibliográficos
Autores principales: Jensen, Anders A, Bräuner-Osborne, Hans
Formato: Texto
Lenguaje:English
Publicado: Bentham Science Publishers Ltd. 2007
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2656812/
https://www.ncbi.nlm.nih.gov/pubmed/19305800
http://dx.doi.org/10.2174/157015907781695982
Descripción
Sumario:The calcium (Ca(2+))-sensing receptor (CaR) belongs to family C of the G-protein coupled receptors (GPCRs). The receptor is activated by physiological levels of Ca(2+) (and Mg(2+)) and positively modulated by a range of proteinogenic L-α-amino acids. Recently, several synthetic allosteric modulators of the receptor have been developed, which either act as positive modulators (termed calcimimetics) or negative modulators (termed calcilytics). These ligands do not activate the wild-type receptor directly, but rather shift the concentration-response curves of Ca(2+) to the left or right, respectively. Like other family C GPCRs, the CaR contains a large amino-terminal domain and a 7-transmembrane domain. Whereas the endogenous ligands for the receptor, Ca(2+), Mg(2+) and the L-α-amino acids, bind to the amino-terminal domain, most if not all of the synthetic modulators published so far bind to the 7-transmembrane domain. The most prominent physiological function of the CaR is to maintain the extracellular Ca(2+) level in a very tight range via control of secretion of parathyroid hormone (PTH). Influence on e.g. secretion of calcitonin from thyroid C-cells and direct action on the tubule of the kidney also contribute to the control of the extracellular Ca(2+) level. This control over PTH and Ca(2+) levels is partially lost in patients suffering from primary and secondary hyperparathyroidism. The perspectives in CaR as a therapeutic target have been underlined by the recent approval of the calcimimetic cinacalcet for the treatment of certain forms of primary and secondary hyperparathyroidism. Cinacalcet is the first clinically administered allosteric modulator acting on a GPCR, and thus the compound constitutes an important proof-of-concept for future development of allosteric modulators on other GPCR drug targets.