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Massman LJ, Pereckas M, Zwagerman NT, Olivier-Van Stichelen S. O-GlcNAcylation is essential for rapid Pomc expression and cell proliferation in corticotropic tumor cells. Endocrinology 2021 34418053
Abstract:
Pituitary adenomas have a staggering 16.7% lifetime prevalence and can be devastating in many patients due to profound endocrine and neurologic dysfunction. To date, no clear genomic or epigenomic markers correlates with their onset or severity. Herein, we investigate the impact of the O-GlcNAc post-translational modification in their etiology. Found in over 5000 human proteins to date, O-GlcNAcylation dynamically regulates proteins in critical signaling pathways, and its deregulation is involved in cancers progression and endocrine diseases such as diabetes. In this study, we demonstrate that O-GlcNAcylation enzymes were upregulated, particularly in aggressive ACTH-secreting tumors, suggesting a role for O-GlcNAcylation in pituitary adenoma etiology. In addition to the demonstration that O-GlcNAcylation was essential for their proliferation, we show that the endocrine function of pituitary adenoma is also dependent on O-GlcNAcylation. In corticotropic tumors, hyper-secretion of the proopiomelanocortin (POMC)-derived hormone ACTH leads to Cushing's disease, materialized by severe endocrine disruption and increased mortality. We demonstrate that Pomc mRNA is stabilized in an O-GlcNAc-dependent manner in response to corticotrophin-releasing hormone (CRH). By impacting Pomc mRNA splicing and stability, O-GlcNAcylation contributes to this new mechanism of fast hormonal response in corticotropes. Thus, this study stresses the essential role of O-GlcNAcylation in ACTH-secreting adenomas' pathophysiology, including cellular proliferation and hypersecretion.
O-GlcNAc proteins:
GPTC8, ITB4, PTPRF, VIR, HMCN2, SETX, RTF1, MYH7B, FSIP2, TITIN, ARGAL, CO6A5, MMRN2, STOX1, PLXB2, AGRG4, F25A2, LOXH1, HMCN1, TM233, PIEZ1, TOPZ1, CE350, M3K19, RYR2, ACACB, RN213, CF251, ARHG5, BICRA, FOXM1, DLDH, PEX5, WRN, CELR1, PROM1, STK10, MYPC3, DTNB, IKKB, ACTN3, ALDOC, RPB1, LMNB1, MAP1B, HVM57, PAI1, MCM3, MIS, RGRF1, MSRE, CTND1, RB22A, ZO1, QOR, ANXA5, MSH6, EVC, KCNN2, DEPD5, NOE3, TBB4B, ROCK1, GSH1, G3BP1, ATS1, TBB5, NF1, PGBM, IF2P, FA8, GDF3, KCMA1, ZCH18, TANC1, NSUN7, SHRM4, FAT4, IGFN1, HMHA1, FA98A, SCRN3, CH048, K22E, SHLD2, BIG3, SDK1, BAHC1, SLMAP, TBCD9, RIMB3, DYH12, ITAD, CKAP2, IGS10, A3LT2, ITA1, HERC2, XIRP2, TR150, IQEC2, LRC8B, FAT2, S39AC, VP13A, MTUS1, GSTCD, TENS3, ACACA, UTP20, KLRA4, PAPOA, STAR3, EWS, KTN1, GRID1, DDX5, CP131, SEM3B, TLL1, MINT, CCPG1, BTF3, TPP2, RBL1, COBA2, TASOR, PDS5A, CE290, NAL14, A2MG, ZZZ3, FREM2, CPSF6, RPRD2, HEAT6, P4R3A, FIL1L, SNX6, GAPD1, PTN23, TRI37, MON1A, MSL1, SARM1, CENPE, DAPLE, TIAM2, UBE2O, KDM3B, SYNE1, CMYA5, FHOD3, TBB2A, MYCB2, SGO2, MCAF1, STAR9, CAPS1, PHF8, CUL9, CLAP1, ST18, SGSM2, TAF1, M18BP, UBP2L, FLNB, OFD1, PTHB1, PDK1, TMCO3, NRDC, MARF1, TM87B, UNC80, TCAF1, KTU, UBP43, CAPS2, ZN609, DOCK2, RHG24, NAKD2, LENG8, UFL1, CD158, CLASR, SSPO, SLTM, NAV1, FBX4, RFWD3, MICA3, STAU2, NEIL3, CCD14, DDX18, UBP45, AL1L1, CCD80, TF2H3, FYCO1, HNRPU, DYH5, DHX36, AGRV1, FLNC, REST, NDUS1, CREL1, CELR3, DYST, BRWD1, GOGA2, PDIA6, TM1L1, RT4I1, CSTN3, PRP19, TARA, UBP16, NOG2, MYO7B, BCDO2, RTN4, RRBP1, ZN318, DHX30, MITOS, RBM33, NARF, KLH35, ACSL3, SYRC, C16L2, NBEA, TBB3, XPO4, RBCC1, LRP1B, CAC1F, PRG4, BIR1B, SRCN1, SHRM3, ING1, MACF1, ACL7A, SMK2B, H17B6, RPGR, RHG07, MAST1, ADA11, TIM, PFKAP, IRAG1, DEMA, P2R3D, SETBP, NEK4, PLD1
Species: Mus musculus
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Lopez Aguilar A, Gao Y, Hou X, Lauvau G, Yates JR, Wu P. Profiling of Protein O-GlcNAcylation in Murine CD8+ Effector- and Memory-like T Cells. ACS chemical biology 2017 12(12) 29125738
Abstract:
During an acute infection, antigenic stimulation leads to activation, expansion, and differentiation of naïve CD8+ T cells, first into cytotoxic effector cells and eventually into long-lived memory cells. T cell antigen receptors (TCRs) detect antigens on antigen-presenting cells (APCs) in the form of antigenic peptides bound to major histocompatibility complex I (MHC-I)-encoded molecules and initiate TCR signal transduction network. This process is mediated by phosphorylation of many intracellular signaling proteins. Protein O-GlcNAc modification is another post-translational modification involved in this process, which often has either reciprocal or synergistic roles with phosphorylation. In this study, using a chemoenzymatic glycan labeling technique and proteomics analysis, we compared protein O-GlcNAcylation of murine effector and memory-like CD8+ T cells differentiated in vitro. By quantitative proteomics analysis, we identified 445 proteins that are significantly regulated in either effector- or memory-like T cell subsets. Furthermore, qualitative and quantitative analysis identified highly regulated protein clusters that suggest involvement of this post-translational modification in specific cellular processes. In effector-like T cells, protein O-GlcNAcylation is heavily involved in transcriptional and translational processes that drive fast effector T cells proliferation. During the formation of memory-like T cells, protein O-GlcNAcylation is involved in a more specific, perhaps more targeted regulation of transcription, mRNA processing, and translation. Significantly, O-GlcNAc plays a critical role as part of the "histone code" in both CD8+ T cells subgroups.
Species: Mus musculus
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