Theacid-sensingionchannelfamily(ASIC)comprisessixdiscreteASICsubunits(ASIC1A,ASIC1B,ASIC2A,ASIC2B,ASIC3,ASIC4)thatdetecttissueacidosis(i.e.adecreaseinpH).Thisacidosisphenomenon isa responsetotissueinjury,pain andinflammation.
Figure:ASIC3expressioncomparedtoothernociceptiveionchannels.DRGsectionsdouble-labeledforASIC3(red)andeitherP2X3(green,A)orTRPV1(green,B);double-labeledcellsareyellowororange.CirclechartsshowtherelativedistributionofthethreereceptorsamongallDRGneurons.ASIC3andP2X3expressionoverlappedinonly4%ofneurons,whilesome35%ofASIC3-positiveneuronsalsoexpressTRPV1.TherarecellspositiveforbothASIC3andP2X3werelarge(eg.cellatlowerleftinA).1406cellscountedforA;995forB.C,D,electrophysiologicalrecordingsrevealaqualitativelysimilarexpressionpatternforcurrentsconformingtoASIC3,P2X3,orTRPV1.ThecellthatgeneratedthecurrentsinCcountsasaco-expressorofASIC3andP2X3,fittingintotheyellowbininthecircleplot.ThecellinDisaco-expressorofASIC3andTRPV1.Cellswerecountedpositiveiftheyhadatleast0.3nAofcurrentinresponsetopH6.8(ASIC3+),50μMATP(P2X3+;transientcurrentonly),or1μMcapsaicin(TRPV1).182cellsrecordedforC;169forD.
ASIC3:CustomerPublications
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