Specificity | P1H12reactsspecificallywithCD146{MCAM,MUC18}.InbloodandmarrowP1H12reactsonlywithendothelialcells,andhasbeenusedtodetectcirculatingendothelialcellsinhuman,dogsandmousesamples.Itpositivelystainsnormal,primaryHUVECandMVECculturesandtheendothelialcellsofallvesselsinnormalfrozensectionsofhumanskin,intestine,ovarytonsil,lymphnode,lung,andkidney.ItdoesnotstaincarcinomacelllinesHT-29andCOLO205,andM21,theTcelllinesJurkatandHuT78,fibroblasts,HL-60orCHOcells,orEBV-transformedBcelllines,althoughitexpectedthatCD146expressionispresentinmanytumorlines.P1H12doesnotstainnormalmonocytes,granulocytes,redcells,platelets,TcellsorBcellsfrommarroworperipheralblood;nordoesitdetectmarrowmegakaryocytesorthemegakaryoblastlineHU3.TheperipheralbloodcellsthatdostainwithP1H12alsoarepositiveforbothvonWillebrandFactor(vWF)andthrombomodulin(thecombinedexpressionofwhichislimitedtoendothelium),andtheystainforfltandflk.Inrecenttesting,melanomaA2058,SKMEL.3andA375.S2arepositive,whilemurinemelanomaM3isnegative.Onesmoothmuscleline(HISM)waspositiveandonenegative(TIGHA-VSMC).Humanbloodlymphoctesarenegativewithorwithoutpriorstimulation. |