CalciumSensingReceptor(CaSR)wasthefirstGPCRidentifiedwhosemainphysiologicalligandisanionandithastheABIlitytosenseextracellularconcentrationofCa2+.CaSR"sactivityismediatedbyaG-proteinthatactivatesaphosphatidylinositol-calciumsecondmessengersystemanditiscapableofinteractionwithVCP,RNF19A(executeCASR"subiquitination)andARRB1.CaSRisexpressedprimarilyinchiefcellsofparathyroidglandswhere,whenactivatedbyhighCa2+concentrations,itdecreasesPTHrelease(calcium-retaininghormone)tomaintainCa2+.Alternatively,underhypocalcemiaconditions,CaSRisinactiveandPTHisreleasedwhichrestoresnormocalcemiabyactingonkidneyaswellasintestinetoincreaseCa2+absorption,andonbone,tomobiliseskeletalCa2+.
Image:WesternBlotofCalciumSensingReceptorintransfected293celllysate.ECLexposure,5minutes.Inthisphoto,theproteinhasaggregatedandthusthehigherMWbandasexpected.
CaSRisalsoexpressedinothertissueswhichdonotplayanobviousroleinCa2+homeostasis(breast,bloodvessels,liver,andplacenta)andalteredCaSRexpressionand/oractivityhavebeenfoundassociatedwithparathyroidglandsdisorders,osteoporosis,vascularcalcificationandcancer.CaSRisimplicatedinregulationofdiverseprocessesthatincludeshormonesecretion,geneexpression,ionchannelactivity,modulationofinflammation,proliferation,differentiation,andapoptosis,dependingoncelltype,andtherefore,representsakeymoleculeinphysiology.DefectsinCaSRhavebeenlinkedtofamilialhypocalciurichypercalcemiatype1(FHH),neonatalsevereprimaryhyperparathyroidism(NSHPT),familialisolatedhypoparathyroidism(FIH)andepilepsy,idiopathicgeneralizedtype8(EIG8).
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