GlialCellLine-derivedNeurotrophicFactor(GDNF)isarecentlydiscoveredneurotrophicfactorthathasbeenshowntopromotethesurvivalofvariousneuronalsubpopulationsinboththecentralaswellastheperipheralnervoussystemsatdifferentstagesoftheirdevelopment.NeuronalsubpopulationsthathavebeenshowntobeaffectedbyGDNFincludemotoneurons,midbraindopaminergicneurons,Purkinjecellsandsympatheticneurons.
NativeGDNF,adisulfide-linkedhomodimericglycoprotein,isanovelmemberoftheTGF-βsuperfamily.RatGDNFCDNAencodesa211aminoacidresidueprepropeptidethatisprocessedtoyieldadimericproteincomposedoftwo134aminoacidresiduesubunits.TheGDNFsequencecontainstwopotentialglycosylationsitesandinsectcell-expressedrecombinantratGDNFproteinsareglycosylated.MatureratandhumanGDNFexhibitapproximately93%aminoacidsequenceidentityandshowconsiderablespeciescross-reactivity.CellsknowntoexpressGDNFincludeSertolicells,type1astrocytes,Schwanncells,neurons,pinealocytesandskeletalmusclecells.
Reference:
ADNAsequenceencodingtheratGDNFproteinsequence(Lin,L-F.etal1993,Science260:1130-1132)wasinsertedinabaculovirusexpressionvectorandexpressedinSf21insectcells.
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