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TheDetectX®RetinolBindingProtein(RBP)ImmunoassayKitisdesignedtomeasureRBPlevelsinserum,EDTAandheparinplasma.ThiskitusesnativehumanRBPasastandard,theconcentrationofwhichhasbeenestablishedviaaminoacidanalysis.StandardsordilutedsamplesarePipettedintoamicrotiterplatecoatedandRBP-peroxidaseconjugateisadded.ThebindingreactionisinitiatedbyadditionofaRBP-specificrabbitpolyclonalantibody.Aftera60-minuteincubation,theplateiswashedandTMBsubstratesolutionaddedtoeachwell.After30minutestheintensityofthegeneratedsignalisreadat450nminamicrotiterplatereader.
Retinolbindingprotein(RBP)isfromafamilyofstructurallyrelatedproteinsthatbindsmallhydrophobicmoleculessuchasbilepigments,steroids,odorants,etc.RBPisahighlyconserved21kDasingle-chainglycoprotein,consistingof182aminoacidswith3disulfidebonds,thathasahydrophobicpocketwhichbindsretinol(vitaminA).RBPbindsretinolina1:1stoichiometry,whichservestonotonlysolubilizeretinolbutalsoprotectitfromoxidation.Wheninserum,themajorityofRBPboundwithretinolisreversIBLycomplexedwithtransthyretin.Thiscomplextransportsretinoltospecificreceptorsofvarioustissuesinthebody.VitaminAstatusisreflectedbyserumconcentrationasitishomeostaticallycontrolledanddoesnotfalluntilstoresaredramaticallyreduced.RBPhasbeenshowntobeausefulsurrogateMarkerforretinolbecauseofthecorrelationbetweenretinolandRBPinserum,whichimpliesthatRBPmaybeusedtomonitorvitaminAdeficiency(VAD).TheWHOhasestimatedthat250millionchildrenhavemoderatetosevereVADduetolackofadequatenutrition,andtherisingcostoffoodstaplesaroundtheworldfurtherexacerbatesthisproblem.Inadditiontonutritionaldeficiencies,infectiousstresseshavebeenshowntodepressretinolconcentrationsandindividualswithdiseasessuchascysticfibrosisandHIV-1alsoruntheriskofVADduetotheinfectiousstressesthatcontributetothedisease.ModulatingRBP4levelsmayleadtonewstrategiesintreatingtype2diabetes.
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Arbor Assays公司成立于2007年,位于密歇根州的安娜堡,公司的三位主创始人均为有多年科研经验的生命和临床科学家。其宗旨是为临床使用的重要生物分子建立高质量的检测和免疫测试产品。在生物领域建立健全的免疫检测和酶活性试剂盒以定量生物分子。
Arbor Assays公司的主要产品包括:
DetectX® Kits
Inhibitors & Activators
AbX® Antibodies & Affinity Resins
Detection Systems
Components & Ancillary Reagents