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Jo S, Esch N, Nguyen A, Wong A, Mohan R, Kim C, Blandino-Rosano M, Bernal-Mizrachi E, Alejandro EU. Loss of O-GlcNAcylation modulates mTORC1 and autophagy in β cells, driving diabetes 2 progression. JCI insight 2024 9(23) 39388284
Abstract:
Type 2 diabetes (T2D) arises when pancreatic β cells fail to produce sufficient insulin to control blood glucose appropriately. Aberrant nutrient sensing by O-GlcNAcylation and mTORC1 is linked to T2D and the failure of insulin-producing β cells. However, the nature of their crosstalk in β cells remains unexplored. Recently, O-GlcNAcylation, a posttranslation modification controlled by enzymes O-GlcNAc transferase/O-GlcNAcase (OGT/OGA), emerged as a pivotal regulator for β cell health; deficiency in either enzyme causes β cell failure. The present study investigates the previously unidentified connection between nutrient sensor OGT and mTORC1 crosstalk to regulate β cell mass and function in vivo. We show reduced OGT and mTORC1 activity in islets of a preclinical β cell dysfunction model and islets from humans with obesity. Using loss or gain of function of OGT, we identified that O-GlcNAcylation positively regulated mTORC1 signaling in β cells. O-GlcNAcylation negatively modulated autophagy, as the removal of OGT increased autophagy, while the deletion of OGA decreased it. Increasing mTORC1 signaling, via deletion of TSC2, alleviated the diabetic phenotypes by increasing β cell mass but not β cell function in OGT-deficient mice. Downstream phospho-protein signaling analyses revealed diverging effects on MKK4 and calmodulin signaling between islets with OGT, TSC2, or combined deletion. These data provide evidence of OGT's significance as an upstream regulator of mTORC1 and autophagy, crucial for the regulation of β cell function and glucose homeostasis.
O-GlcNAc proteins:
MTOR, RPTOR, RPTOR, LST8, LST8, MTOR
Species: Mus musculus, Homo sapiens
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Lee BE, Kim HY, Kim HJ, Jeong H, Kim BG, Lee HE, Lee J, Kim HB, Lee SE, Yang YR, Yi EC, Hanover JA, Myung K, Suh PG, Kwon T, Kim JI. O-GlcNAcylation regulates dopamine neuron function, survival and degeneration in Parkinson disease. Brain : a journal of neurology 2020 143(12) 33300544
Abstract:
The dopamine system in the midbrain is essential for volitional movement, action selection, and reward-related learning. Despite its versatile roles, it contains only a small set of neurons in the brainstem. These dopamine neurons are especially susceptible to Parkinson's disease and prematurely degenerate in the course of disease progression, while the discovery of new therapeutic interventions has been disappointingly unsuccessful. Here, we show that O-GlcNAcylation, an essential post-translational modification in various types of cells, is critical for the physiological function and survival of dopamine neurons. Bidirectional modulation of O-GlcNAcylation importantly regulates dopamine neurons at the molecular, synaptic, cellular, and behavioural levels. Remarkably, genetic and pharmacological upregulation of O-GlcNAcylation mitigates neurodegeneration, synaptic impairments, and motor deficits in an animal model of Parkinson's disease. These findings provide insights into the functional importance of O-GlcNAcylation in the dopamine system, which may be utilized to protect dopamine neurons against Parkinson's disease pathology.
O-GlcNAc proteins:
BIG2, F1712, VIR, AJM1, RPGP1, UBR4, SCN1A, AGRIN, KALRN, STPG3, FXL16, TT23L, PTPRS, GRIK3, SCN2A, DLGP4, OSBL8, PTPRZ, PGBD5, GLSK, GCN1, CE350, PI4KA, RYR2, AGRF2, UBE4A, NRX2A, FRY, SYGP1, OTOGL, AT2B1, ANK3, CA2D1, DPYL2, STXB1, DCTN1, U5S1, GFRA2, GALT1, SEM4D, KIF3C, PLCA, PHB2, NCAM2, GRAK, PURB, IMA3, IMA7, PLD3, FOLH1, FKBP8, STX1A, PSDE, VIAAT, AP1B1, C1QBP, SYT3, HNRH1, SATT, CTND2, SDC4, AP3D1, RGS9, RGS7, CSK22, OX2G, AAKG1, CRYM, PROM1, CNTP1, ENTP2, BCKD, SNG1, NIPS1, NIPS2, SEPT7, AT2A2, PI51C, PI42A, ITB5, GPX4, NPTX2, GNAZ, WDR1, S4A4, MTX2, CNTFR, ZFR, CSN3, HCN2, HCN1, CTBP1, BSN, MPP3, NOE1, CBPD, LGMN, COR1A, CYB, COX1, COX2, COX3, HPRT, ATP6, THY1, H3C, LAMC1, NU1M, NU2M, NU4M, NU5M, ATP8, GFAP, MBP, PRIO, ALDOA, KAPCA, AATM, TBA1B, TBA3, KIT, LDHA, G6PI, MDR1B, ENPP1, HS90A, ENPL, KCC4, NFL, NFM, RASN, PGK2, ITB1, PPBT, NUCL, PGK1, ACE, LRC4B, UBB, UBC, EF1A1, IF4A2, GSTM1, 4F2, H10, LAMP1, HS90B, L1CAM, ITA5, KCC2A, ITB2, ITPR1, TCPA, PFKAL, CNTN1, NCAM1, AT1B1, C1QB, RS16, RL7, AT1B2, PSMD3, MAP1B, GLNA, CADH2, INSR, NTRK2, KCNC1, SPTB1, H12, KPCE, LDHB, CN37, DDX3L, KCNA1, KCNA3, AMPE, ASSY, SPTN1, G3P, LAMP2, ENOA, AP2A1, AP2A2, HXK1, GTR1, PTPRA, COF1, GNAO, FAS, LAMA1, NFH, COX41, BIP, HEXB, VIME, MTAP2, MAG, GNA11, GNAQ, MDR1A, ACES, GBRG2, AP1G1, GBRD, EIF3A, CXA1, GRIA1, GRIA2, TY3H, RS2, GBRA2, RL3, BRAF, KCC2B, NP1L1, NCKP1, SNAB, KIF3A, PABP1, GBB4, KCRU, GNA14, KAP3, SC6A1, S6A11, MP2K1, GTR3, LA, RASK, SYWC, KIF1A, HYES, RAB3D, RAB5C, RAB6A, RAB21, NMDZ1, ODPA, RET, FBRL, KCNJ2, CD81, GPM6A, GPM6B, GNL1, DYN1, DYN2, GRIK2, CAP1, ABCA2, PURA, HD, EAA2, H14, H15, H13, ITAV, SYT1, NSF, RB11B, AINX, MYO1B, NEDD4, ALDH2, GRM8, CAZA2, CAPZB, MP2K4, PFKAM, RL6, RL29, RL5, GLRB, DCE1, DCE2, CBR1, GSTM5, ADT1, INPP, CDK5, SAHH, GDIA, VATA, VATE1, GBRB1, RAB7A, ACADL, VA0D1, ADT2, EAA3, KCNJ4, KPYM, RAB2A, PRS6B, PTN5, NCAN, ABCD3, RAB8A, ATPK, ATP5E, UBP5, ATPB, CTBP2, EAA1, WFS1, FUS, NICA, ACTN4, ASM3B, EF2, OPA1, DOCK4, IRPL1, ARPC4, MYPR, PLPP, ACTB, MDGA2, NEUG, RAC3, IF4A1, MEGF8, RAB5B, RAB10, RAB8B, ARP2, ACTZ, CSN2, ARF3, ARL1, CAH10, RAP2B, STX1B, RAB6B, RL27, ARF4, GABT, 1433G, RS7, PP1A, RS8, SMD1, KCAB2, ABI2, RB11A, EF1A2, RS4X, PP2AB, RL18A, ACTA, AP2S1, RL23A, VISL1, H4, GBRA1, VATB2, RAB1A, RAB3C, RAN, RAP1A, RS24, GBB1, GBB2, RS3, RL8, RS27A, RL40, RAC1, RAB3A, HSP7C, CH60, VAMP2, NOE3, GBRB3, VATL, PP1G, 1433Z, GBRB2, KCNA2, KCAB1, CRNL1, DYL1, ACTG, ACTH, KPCG, PP2BA, PP2AA, PHB1, CSK2B, ACTC, RACK1, ACTS, KAPCB, TBA4A, TBA1A, TBB4B, KPCB, H31, IMB1, PLXA1, PLXA2, PLXA3, DCC, ITPR3, NCHL1, HNRH2, ELAV1, USP9X, IDHG1, LYAG, AT8A1, TCPH, TCPB, TCPD, TCPE, TCPZ, TCPG, TNIK, WNK1, RL36A, ARF1, ARF5, AP2M1, H32, H33, ADCY5, NPTN, RS3A, AT1B3, DPYL1, ZNT3, GRM1, SHPS1, NEO1, M4K4, C1QA, TBB5, PDE4D, PDE1B, NMDE2, SC23A, TERA, C1QC, CTNB1, PLAK, EPHA4, MARK3, ATPA, CHLE, KCND1, KCRB, NF1, CDK18, RAC2, MARK2, PGBM, PTPRG, PYC, KCMA1, PADI2, INF2, TRIO, MDGA1, CTP5A, ITB8, PSA, GRM2, PTCD3, PHAR1, LRFN1, SPP2B, HP1B3, NLRX1, PRC2C, TM38A, VGLU1, BIG3, PLXD1, AGAP2, AAK1, TEN4, CAMKV, DOP2, RMD3, SMU1, MCCB, GPD1L, LIGO2, SRBS2, CDKL5, K22O, VPS51, GRM5, CBAR2, SHAN3, UN13A, SE6L2, KCTD8, KCD16, LRC8B, VP13A, C2C4C, S2551, MRS2, DIRA2, CYFP2, TM1L2, RHG44, MYO1D, RABL6, DJC11, UIMC1, ICAM5, FLOT2, HNRPD, PTPRN, CSK21, KHDR1, IGF1R, CLD11, SPB6, ARHG2, VDAC2, VDAC3, VDAC1, ABCB7, ASTN1, P3C2A, CAC1E, LAMB2, CTNA2, SC6A3, CNTN2, PGCB, NEP, KCNA4, CD166, 5NTD, GSLG1, EWS, AP180, FSCN1, GDIB, GRIK5, GRID1, DDX5, ITIH3, IL1AP, CD47, KINH, KIF3B, LASP1, MYH10, MOG, NPM, PCBP2, CSPG2, DDX3Y, DLG4, RHOC, DAG1, DDX3X, SYPH, TICN1, NDUA4, NPTX1, NUP62, OMGP, HECAM, AOFA, ARP3B, SURF4, SYN2, CP3AD, H2B1H, GLPK, SDC3, GPDM, H2A2C, H2B2B, GRM7, GRM4, CLH1, K1549, GIT1, PKP4, PPR29, CNTN4, NLGN2, SV2C, THS7A, CE170, UBP7, BRNP2, SCMC3, LIGO3, DGKB, RPRD2, DPP10, S23IP, PPRC1, 2ABA, TNPO3, SIK3, U520, S39AA, TTYH3, XPO1, SPCS, KCRS, CSKI1, NRX3A, BCR, SARM1, PRRT3, TEFF1, RAB35, CA2D2, KCC2D, AT1A3, AT1A2, GNAS1, SDK2, WDFY3, NTRK3, RAD9B, DGLA, KCD12, MTMR5, UBE2O, CAND1, UBP34, RS9, 2ABB, H2B1C, TLN2, CSPG5, 2AAA, NP1L4, MTCH2, OPALI, CYFP1, TBB2A, HUWE1, IGS21, ROBO2, ACTN1, IGSF1, TR143, TPPP, OTUB1, KPBB, PP6R1, MAP6, ELP1, RRAGD, MRCKB, GABR2, CSMD3, EPT1, VAT1L, LRRC7, CAPS1, CYLD, AGRL1, AGRL3, CLAP1, AUXI, DAAM2, MADD, MFN2, NU214, UBE3C, PLXA4, FBX2, KCMF1, CBPM, GSTM7, AGFG2, LRC8A, HPLN4, VAC14, C2C2L, LRRT4, BDH, MK15, CNKR2, TENA, ASTN2, NEGR1, RAP2A, THEM6, SLIK5, SLIK4, SLIK3, SLIK2, NFASC, NRCAM, RHG32, SRGP3, EFTU, VGLU3, ERLN2, SV2B, MIRO1, EFR3A, LRRT2, U2AF4, ENPP6, SYAC, FLRT3, CBLN2, LRTM2, HPCL4, COR2B, S2512, ATLA1, NU107, RB39B, RB39A, ZN526, ANS1B, DLGP2, AHSA1, IPO5, NCEH1, LSAMP, CADM2, NOE2, ODP2, RBGPR, ECHA, SPA2L, SYNC, RL24, DAAM1, DMXL2, RLGPB, CLAP2, VMAT2, ARF2, NDRG4, ENPP4, HSDL1, RAP2C, GEPH, VATH, PMGT2, TTC12, AOFB, LRFN5, PIGT, CTL2, TENR, NLGN3, LRRT3, DYN3, LRC4C, ARHGA, SYFA, SI1L1, LCAP, EXOG, CERS6, SEP11, IKZF4, GP158, CWC22, VPS52, SCAI, ANK2, PDE10, PGM2L, SHFL, MIC60, WDR37, ABI1, SYNPO, T132C, GLT13, NED4L, RPB2, TCRG1, GNAL, H2B1K, H2B1P, H2A1F, H2A1H, H2A1K, OGT1, SYNJ1, SEPT8, MBOA7, PGP, NGEF, PYGB, COPA, MARK4, DOCK3, PLXB1, TXTP, AGRL2, TRHDE, R4RL1, RTN1, HS12A, K319L, DNM1L, AGRG1, PACS1, ABCF3, SDHA, HACD3, AGFG1, PAF1, IPO11, CCM2, MATR3, ATAT, LRRT1, LGI3, RPTOR, COL12, NAC2, THIL, EIF3L, MARE2, HNRPL, K0513, IQEC1, CACB4, SCPDL, BPHL, SNG3, EIF3C, H2AJ, DC1L1, S35A3, AP3M2, MUC18, UBQL1, PSPC1, NUP58, IGSF8, EXOC1, CACB1, CADM4, NUP85, SNP47, ACTY, WASF1, AMPB, MICU1, PSMD2, AT1A1, CDIPT, GD1L1, CC50A, HNRPU, REM2, S25A3, MARK1, CSPG4, SORC3, IPO4, SFPQ, BACH, S12A5, RAB14, SFXN3, ACLY, NDUS1, ITM2C, RMXL1, MIC25, ATPG, DDX1, MLP3A, UBAP2, ACSL6, NDUS2, ERLN1, DLG2, PI42C, IPO9, NDUV1, GRHPR, SRGP2, SRGP1, RAB4B, LRP1, WDR7, BRNP1, SYDC, TBB6, PDK3, TSN2, PDE2A, RPAB3, CSMD1, KCC2G, 2ABD, ATAD3, SFXN5, MYO5A, G37L1, RAP1B, SFXN1, NLGN1, NONO, RRAGC, TIP, MLF2, GAK, CDS2, NDUAA, ETFA, TNPO2, PTPRT, DNJA3, T121B, SF3B1, RIMS1, CNTP4, NTRI, PRP8, COX6C, MGST3, CNTP2, 6PGL, QCR8, NDUB4, RAB5A, GLRX3, AT5F1, S2546, MLP3B, 1433B, RL14, M2OM, UCRI, MIC19, PRPS2, NRX1A, MICU3, ARPC2, TBB2B, ROA0, CENPV, RL11, ILF2, TECR, RN181, BIEA, QCR1, OLA1, RL15, AL1B1, TOM70, MPC2, ODPB, MMS19, MGRN1, HNRPM, SCOT1, DYL2, RM28, RAB1B, LIGO1, RUFY3, MEII1, ATAD1, CUL5, GBRA4, TBB4A, GHC1, IDH3A, PRPS1, U2AF1, RL4, PSD12, SNAA, ATPO, BTBDH, QCR2, ALG2, AP2B1, RPN2, SUSD2, NDUA9, NDUS7, 6PGD, EIF3F, NDUS3, RAB13, XPO7, IPO7, NBEA, SORC2, VPS35, RPGF4, TBB3, XPO2, RTN3, LRBA, SPN90, TRIM2, DYHC1, LRP1B, LGI1, PRAF2, SV2A, SCAM5, NECT1, HYOU1, EXTL1, SORC1, DCLK1, MTOR, MINK1, ZN207, AP3B2, RHOA, HPLN1, FAK2, NAGAB, COPG2, KI21A, SHRM3, PLEC, DREB, S2513, EHD3, PLXB3, ADDA, DNJA2, GRM3, PCLO, SIA7A, ARP10, DCTN5, PLXC1, COPG1, GPC1, UBQL2, FBX6, SRR, AT2B2, CELR2, DEST, ARC1A, KAD1, GBRG1, GUAD, CBLN1, DGKE, VAS1, ADA22, ADA23, PEPL, CAD13, TEN1, TEN2, CUL1, ATRN, GLPK2, PDC6I, PFKAP, PYGM, SUCA, RBMX, GABR1, GSK3B, FPRP, E41L3, BUB3, CARM1, PSD13, CP46A, APC7, NCDN, ITB6, KCND2, NU160, HNRDL, SAE2, VATC1, VPP1, ARI1, CA2D3, SEPT3, AP3B1, STK39, DPP6, E41L1, SUCB1, SEPT5, GRIA4, GRIA3, HOME1
Species: Mus musculus
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