NRP2(Neuropilin-2),alsocalledNpn2orVEGF165R2,encodesamemberoftheneuropilinfamilyofreceptorproteins.ThesolubleNRP2wassecretedasa62.5-kDproteinfollowingtransfectioninChinesehamsterovarycells.TheNRP2geneismappedto2q33.3.TheNRP2genecontains17exonsandspansabout112kb.Thisproteinmayplayaroleincardiovasculardevelopment,axonguidance,andtumorigenesis.MicewithnullmutationsingenesencodingSema3F,anditsholoreceptorcomponentsNpn2andplexinA3(PLEXA3),exhibitincreaseddentategyrusgranulecellandcorticallayerVpyramidalneuronspinenumberandsize,andalsoaberrantspinedistribution.Moreover,Sema3Fpromoteslossofspinesandexcitatorysynapsesindissociatedneuronsinvitro,andinNRP2-nullbrainslicescorticallayerVanddentategyrusgranulecellsexhibitincreasedminiatureexcitatorypostsynapticcurrentfrequency.ThesedisparateeffectsofsecretedsemaphorinsarereflectedintherestricteddendriticlocalizationofNRP2toapicaldendritesandofNpn1toalldendritesofcorticalpyramidalneurons.