Abstract
StarD7 is a lipid binding protein involved in the delivery of phosphatidylcholine to the mitochondria whose promoter is activated by Wnt/β-catenin signaling. Although the majority of glucose enters glycolysis, ~ 2–5% of it can be metabolized via the hexosamine biosynthetic pathway (HBP). Considering that HBP has been implicated in the regulation of β-catenin we explored if changes in glucose levels modulate StarD7 expression by the HBP in trophoblast cells. We found an increase in StarD7 as well as in β-catenin expression following high-glucose (25 mM) treatment in JEG-3 cells; these effects were abolished in the presence of HBP inhibitors. Moreover, since HBP is able to promote unfolded protein response (UPR) the protein levels of GRP78, Ire1α, calnexin, p-eIF2α and total eIF2α as well as XBP1 mRNA was measured. Our results indicate that a diminution in glucose concentration leads to a decrease in StarD7 expression and an increase in the UPR markers: GRP78 and Ire1α. Conversely, an increase in glucose is associated to high StarD7 levels and low GRP78 expression, phospho-eIF2α and XBP1 splicing, although Ire1α remains high when cells are restored to high glucose. Taken together these findings indicate that glucose modulates StarD7 and β-catenin expression through the HBP associated to UPR, suggesting the existence of a link between UPR and HBP in trophoblast cells. This is the first study reporting the effects of glucose on StarD7 in trophoblast cells. These data highlight the importance to explore the role of StarD7 in placenta disorders related to nutrient availability.
Similar content being viewed by others
Abbreviations
- AZA:
-
O-Diazoacetyl-l-serine
- DON:
-
6-Diazo-5-oxo-l-norleucine
- eIF2α:
-
Eukaryotic translation initiation factor 2 subunit 1α
- ER:
-
Endoplasmic reticulum
- FBS:
-
Fetal bovine serum
- GFAT:
-
Glutamine fructose-6-phosphate amidotransferase
- GlcNAc:
-
N-acetylglucosamine
- GRP78:
-
Glucose regulated protein 78
- HBP:
-
Hexosamine biosynthetic pathway
- IRE1α:
-
Inositol-requiring enzyme 1
- O-GlcNAc:
-
O-GlcNAcylation
- OGT:
-
O-GlcNAc transferase
- siRNA:
-
Small interfering RNA
- StarD7:
-
StAR-related lipid transfer (START) domain containing 7
- TBS:
-
Tris buffered saline
- UDP-GlcNAc:
-
Uridine diphosphate N-acetylglucosamine
- UPR:
-
Unfolding protein response.
References
Efeyan A, Comb WC, Sabatini DM (2015) Nutrient-sensing mechanisms and pathways. Nature 517:302–310
Denzel MS, Antebi A (2015) Hexosamine pathway and (ER) protein quality control. Curr Opin Cell Biol 33:14–18
Hardiville S, Hart GW (2014) Nutrient regulation of signaling, transcription, and cell physiology by O-GlcNAcylation. Cell Metab 20:208–213
Hart GW, Housley MP, Slawson C (2007) Cycling of O-linked beta-N-acetylglucosamine on nucleocytoplasmic proteins. Nature 446:1017–1022
Taparra K, Tran PT, Zachara NE (2016) Hijacking the hexosamine biosynthetic pathway to promote EMT-mediated neoplastic phenotypes. Front Oncol 6:85
Srinivasan V, Tatu U, Mohan V, Balasubramanyam M (2009) Molecular convergence of hexosamine biosynthetic pathway and ER stress leading to insulin resistance in L6 skeletal muscle cells. Mol Cell Biochem 328:217–224
Sage AT, Walter LA, Shi Y, Khan MI, Kaneto H, Capretta A, Werstuck GH (2010) Hexosamine biosynthesis pathway flux promotes endoplasmic reticulum stress, lipid accumulation, and inflammatory gene expression in hepatic cells. Am J Physiol Endocrinol Metab 298:E499–E451
Lai E, Teodoro T, Volchuk A (2007) Endoplasmic reticulum stress: signaling the unfolded protein response. Physiology (Bethesda) 22:193–201
Durand S, Angeletti S, Genti-Raimondi S (2004) GTT1/StarD7, a novel phosphatidylcholine transfer protein-like highly expressed in gestational trophoblastic tumour: cloning and characterization. Placenta 25:37–44
Angeletti S, Rena V, Nores R, Fretes R, Panzetta-Dutari GM, Genti-Raimondi S (2008) Expression and localization of StarD7 in trophoblast cells. Placenta 29:396–404
Angeletti S, Sanchez JM, Chamley LW, Genti-Raimondi S, Perillo MA (2011) StarD7 behaves as a fusogenic protein in model and cell membrane bilayers. Biochim Biophys Acta 1818:425–433
Flores-Martin J, Rena V, Angeletti S, Panzetta-Dutari GM, Genti-Raimondi S (2013) The lipid transfer protein StarD7: structure, function, and regulation. Int J Mol Sci 14:6170–6186
Horibata Y, Sugimoto H (2010) StarD7 mediates the intracellular trafficking of phosphatidylcholine to mitochondria. J Biol Chem 285:7358–7365
Saita S, Tatsuta T, Lampe PA, Konig T, Ohba Y, Langer T (2018) PARL partitions the lipid transfer protein STARD7 between the cytosol and mitochondria. EMBO J 37:e97909
Bockelmann S, Mina JGM, Korneev S, Hassan DG, Muller D, Hilderink A, Vlieg HC, Raijmakers R, Heck AJR, Haberkant P, Holthuis JCM (2018) A search for ceramide binding proteins using bifunctional lipid analogs yields CERT-related protein StarD7. J Lipid Res 59:515–530
Flores-Martin J, Rena V, Marquez S, Panzetta-Dutari GM, Genti-Raimondi S (2012) StarD7 knockdown modulates ABCG2 expression, cell migration, proliferation, and differentiation of human choriocarcinoma JEG-3 cells. PLoS ONE 7:e44152
Flores-Martin J, Reyna L, Ridano ME, Panzetta-Dutari GM, Genti-Raimondi S (2016) Suppression of StarD7 promotes endoplasmic reticulum stress and induces ROS production. Free Radic Biol Med 99:286–295
Horibata Y, Ando H, Zhang P, Vergnes L, Aoyama C, Itoh M, Reue K, Sugimoto H (2016) StarD7 protein deficiency adversely affects the phosphatidylcholine composition, respiratory activity, and cristae structure of mitochondria. J Biol Chem 291:24880–24891
Yang L, Na CL, Luo S, Wu D, Hogan S, Huang T, Weaver TE (2017) The phosphatidylcholine transfer protein Stard7 is required for mitochondrial and epithelial cell homeostasis. Sci Rep 7:46416
Yang L, Lewkowich I, Apsley K, Fritz JM, Wills-Karp M, Weaver TE (2015) Haploinsufficiency for Stard7 is associated with enhanced allergic responses in lung and skin. J Immunol 194:5635–5643
Ha JR, Hao L, Venkateswaran G, Huang YH, Garcia E, Persad S (2014) beta-catenin is O-GlcNAc glycosylated at Serine 23: implications for beta-catenin’s subcellular localization and transactivator function. Exp Cell Res 321:153–166
Olivier-Van Stichelen S, Dehennaut V, Buzy A, Zachayus JL, Guinez C, Mir AM, El Yazidi-Belkoura I, Copin MC, Boureme D, Loyaux D, Ferrara P, Lefebvre T (2014) O-GlcNAcylation stabilizes beta-catenin through direct competition with phosphorylation at threonine 41. FASEB J 28:3325–3338
Olivier-Van Stichelen S, Guinez C, Mir AM, Perez-Cervera Y, Liu C, Michalski JC, Lefebvre T (2012) The hexosamine biosynthetic pathway and O-GlcNAcylation drive the expression of beta-catenin and cell proliferation. Am J Physiol Endocrinol Metab 302:E417–E424
Zhou F, Huo J, Liu Y, Liu H, Liu G, Chen Y, Chen B (2016) Elevated glucose levels impair the WNT/beta-catenin pathway via the activation of the hexosamine biosynthesis pathway in endometrial cancer. J Steroid Biochem Mol Biol 159:19–25
Anagnostou SH, Shepherd PR (2008) Glucose induces an autocrine activation of the Wnt/beta-catenin pathway in macrophage cell lines. Biochem J 416:211–218
Rena V, Flores-Martín J, Angeletti S, Panzetta-Dutari G, Genti-Raimondi S (2011) StarD7 gene expression in trophoblast cells: contribution of SF-1 and Wnt-b-catenin signalling. Mol Endocrinol 8:1364–1375
van Schadewijk A, van’t Wout EF, Stolk J, Hiemstra PS (2012) A quantitative method for detection of spliced X-box binding protein-1 (XBP1) mRNA as a measure of endoplasmic reticulum (ER) stress. Cell Stress Chaperones 17:275–279
Litvak V, Shaul YD, Shulewitz M, Amarilio R, Carmon S, Lev S (2002) Targeting of Nir2 to lipid droplets is regulated by a specific threonine residue within its PI-transfer domain. Curr Biol 12:1513–1518
Ferrer CM, Sodi VL, Reginato MJ (2016) O-GlcNAcylation in cancer biology: linking metabolism and signaling. J Mol Biol 428:3282–3294
Hanover JA, Krause MW, Love DC (2010) The hexosamine signaling pathway: O-GlcNAc cycling in feast or famine. Biochim Biophys Acta 1800:80–95
Diaz P, Powell TL, Jansson T (2014) The role of placental nutrient sensing in maternal-fetal resource allocation. Biol Reprod 91:82
Howerton CL, Bale TL (2014) Targeted placental deletion of OGT recapitulates the prenatal stress phenotype including hypothalamic mitochondrial dysfunction. Proc Natl Acad Sci USA 111:9639–9644
Howerton CL, Morgan CP, Fischer DB, Bale TL (2013) O-GlcNAc transferase (OGT) as a placental biomarker of maternal stress and reprogramming of CNS gene transcription in development. Proc Natl Acad Sci USA 110:5169–5174
Pantaleon M, Steane SE, McMahon K, Cuffe JSM, Moritz KM (2017) Placental O-GlcNAc-transferase expression and interactions with the glucocorticoid receptor are sex specific and regulated by maternal corticosterone exposure in mice. Sci Rep 7:2017
Zhang Q, Na Q, Song W (2017) Moderate mammalian target of rapamycin inhibition induces autophagy in HTR8/SVneo cells via O-linked beta-N-acetylglucosamine signaling. J Obstet Gynaecol Res 43:1585–1596
Sethi JK, Vidal-Puig AJ (2008) Wnt signalling at the crossroads of nutritional regulation. Biochem J 416:e11–e13
Rena V, Angeletti S, Panzetta-Dutari G, Genti-Raimondi S (2009) Activation of beta-catenin signalling increases StarD7 gene expression in JEG-3 cells. Placenta 30:876–883
Deng RP, He X, Guo SJ, Liu WF, Tao Y, Tao SC (2014) Global identification of O-GlcNAc transferase (OGT) interactors by a human proteome microarray and the construction of an OGT interactome. Proteomics 14:1020–1030
Zachara NE, Hart GW (2004) O-GlcNAc a sensor of cellular state: the role of nucleocytoplasmic glycosylation in modulating cellular function in response to nutrition and stress. Biochim Biophys Acta 1673:13–28
Sohn KC, Lee KY, Park JE, Do SI (2004) OGT functions as a catalytic chaperone under heat stress response: a unique defense role of OGT in hyperthermia. Biochem Biophys Res Commun 322:1045–1051
Carvalho-Cruz P, Alisson-Silva F, Todeschini AR, Dias WB (2017) Cellular glycosylation senses metabolic changes and modulates cell plasticity during epithelial to mesenchymal transition. Dev Dyn 247:481–491
Jang I, Kim HB, Seo H, Kim JY, Choi H, Yoo JS, Kim JW, Cho JW (2015) O-GlcNAcylation of eIF2alpha regulates the phospho-eIF2alpha-mediated ER stress response. Biochim Biophys Acta 1853:1860–1869
Acknowledgements
This work was funded by the Agencia Nacional de Promoción Ciencia y Técnica (FONCYT) PICT 2014-0806 and 2015-1781, and the Secretaría de Ciencia y Técnica de la Universidad Nacional de Córdoba (SECyT-UNC). S.G-R. and G.M.P-D. are Career Investigators of the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). J F-M, L-R, M-CDP and ML-R thank FONCYT and CONICET for her fellowships.
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
Conflict of interest
The authors declare no conflict of interest.
Rights and permissions
About this article
Cite this article
Flores-Martín, J., Reyna, L., Cruz Del Puerto, M. et al. Hexosamine pathway regulates StarD7 expression in JEG-3 cells. Mol Biol Rep 45, 2593–2600 (2018). https://doi.org/10.1007/s11033-018-4428-9
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11033-018-4428-9