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Martínez-Alonso E, Guerra-Pérez N, Escobar-Peso A, Regidor I, Masjuan J, Alcázar A. Differential Association of 4E-BP2-Interacting Proteins Is Related to Selective Delayed Neuronal Death after Ischemia. Int J Mol Sci 2021; 22:ijms221910327. [PMID: 34638676 PMCID: PMC8509075 DOI: 10.3390/ijms221910327] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 09/21/2021] [Accepted: 09/22/2021] [Indexed: 12/30/2022] Open
Abstract
Cerebral ischemia induces an inhibition of protein synthesis and causes cell death and neuronal deficits. These deleterious effects do not occur in resilient areas of the brain, where protein synthesis is restored. In cellular stress conditions, as brain ischemia, translational repressors named eukaryotic initiation factor (eIF) 4E-binding proteins (4E-BPs) specifically bind to eIF4E and are critical in the translational control. We previously described that 4E-BP2 protein, highly expressed in brain, can be a molecular target for the control of cell death or survival in the reperfusion after ischemia in an animal model of transient cerebral ischemia. Since these previous studies showed that phosphorylation would not be the regulation that controls the binding of 4E-BP2 to eIF4E under ischemic stress, we decided to investigate the differential detection of 4E-BP2-interacting proteins in two brain regions with different vulnerability to ischemia-reperfusion (IR) in this animal model, to discover new potential 4E-BP2 modulators and biomarkers of cerebral ischemia. For this purpose, 4E-BP2 immunoprecipitates from the resistant cortical region and the vulnerable hippocampal cornu ammonis 1 (CA1) region were analyzed by two-dimensional (2-D) fluorescence difference in gel electrophoresis (DIGE), and after a biological variation analysis, 4E-BP2-interacting proteins were identified by matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) mass spectrometry. Interestingly, among the 4E-BP2-interacting proteins identified, heat shock 70 kDa protein-8 (HSC70), dihydropyrimidinase-related protein-2 (DRP2), enolase-1, ubiquitin carboxyl-terminal hydrolase isozyme-L1 (UCHL1), adenylate kinase isoenzyme-1 (ADK1), nucleoside diphosphate kinase-A (NDKA), and Rho GDP-dissociation inhibitor-1 (Rho-GDI), were of notable interest, showing significant differences in their association with 4E-BP2 between resistant and vulnerable regions to ischemic stress. Our data contributes to the first characterization of the 4E-BP2 interactome, increasing the knowledge in the molecular basis of the protection and vulnerability of the ischemic regions and opens the way to detect new biomarkers and therapeutic targets for diagnosis and treatment of cerebral ischemia.
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Affiliation(s)
- Emma Martínez-Alonso
- Department of Research, Hospital Universitario Ramón y Cajal, IRYCIS, Ctra. Colmenar km 9.1, 28034 Madrid, Spain; (E.M.-A.); (N.G.-P.); (A.E.-P.)
- Proteomics Unit, Hospital Universitario Ramón y Cajal, IRYCIS, Ctra. Colmenar km 9.1, 28034 Madrid, Spain
| | - Natalia Guerra-Pérez
- Department of Research, Hospital Universitario Ramón y Cajal, IRYCIS, Ctra. Colmenar km 9.1, 28034 Madrid, Spain; (E.M.-A.); (N.G.-P.); (A.E.-P.)
- Department of Genetics, Physiology and Microbiology, Faculty of Biological Sciences, Complutense University of Madrid, Av. Complutense, 28040 Madrid, Spain
| | - Alejandro Escobar-Peso
- Department of Research, Hospital Universitario Ramón y Cajal, IRYCIS, Ctra. Colmenar km 9.1, 28034 Madrid, Spain; (E.M.-A.); (N.G.-P.); (A.E.-P.)
| | - Ignacio Regidor
- Department of Neurophysiology, Hospital Universitario Ramón y Cajal, IRYCIS, Ctra. Colmenar km 9.1, 28034 Madrid, Spain;
| | - Jaime Masjuan
- Department of Neurology, Hospital Universitario Ramón y Cajal, IRYCIS, Ctra. Colmenar km 9.1, 28034 Madrid, Spain;
- Department of Neurology, Facultad de Medicina, Universidad de Alcalá, Ctra. Madrid-Barcelona km 33.6, 28871 Alcalá de Henares, Spain
| | - Alberto Alcázar
- Department of Research, Hospital Universitario Ramón y Cajal, IRYCIS, Ctra. Colmenar km 9.1, 28034 Madrid, Spain; (E.M.-A.); (N.G.-P.); (A.E.-P.)
- Proteomics Unit, Hospital Universitario Ramón y Cajal, IRYCIS, Ctra. Colmenar km 9.1, 28034 Madrid, Spain
- Correspondence:
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Abstract
Mammalian target of rapamycin (mTOR) is a conserved serine/threonine kinase of the phosphatidylinositol kinase-related kinase family that regulates cell growth, metabolism, and autophagy. Extensive research has linked mTOR to several human diseases including cancer, neurodegenerative disorders, and aging. In this review, recent publications regarding the mechanisms underlying the role of mTOR in female reproduction under physiological and pathological conditions are summarized. Moreover, we assess whether strategies to improve or suppress mTOR expression could have therapeutic potential for reproductive diseases like premature ovarian failure, polycystic ovarian syndrome, and endometriosis.
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Mayer S, Wrenzycki C, Tomek W. Inactivation of mTor arrests bovine oocytes in the metaphase-I stage, despite reversible inhibition of 4E-BP1 phosphorylation. Mol Reprod Dev 2014; 81:363-75. [DOI: 10.1002/mrd.22305] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Accepted: 01/20/2014] [Indexed: 11/08/2022]
Affiliation(s)
| | - Christine Wrenzycki
- Faculty of Veterinary Medicine; Justus-Liebig-University Giessen, Clinic for Obstetrics, Gynecology and Andrology of Large and Small Animals; Giessen Germany
| | - Wolfgang Tomek
- Faculty of Veterinary Medicine; Justus-Liebig-University Giessen, Clinic for Obstetrics, Gynecology and Andrology of Large and Small Animals; Giessen Germany
- Leibniz-Institute for Farm Animal Biology; Institute for Reproductive Biology; Dummerstorf Germany
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The Akt/mTor signaling cascade is modified during placentation in the porcine uterine tissue. Reprod Biol 2013; 13:184-94. [PMID: 24011189 DOI: 10.1016/j.repbio.2013.06.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Revised: 06/03/2013] [Accepted: 06/04/2013] [Indexed: 12/14/2022]
Abstract
Recently we showed that essential components for the initiation of protein synthesis, namely the eukaryotic initiation factor 4E (eIF4E, mRNA-cap-binding protein) and its repressors 4E-BP1 as well as 4E-BP2, are proteolytically processed in the porcine endometrium during implantation. Here, the situation during placentation was compared with ovariectomized (OVX) animals and animals on pregnancy day 1 (PD1). Furthermore, the research was extended to factors which phosphorylate eIF4E and 4E-BPs and regulate their activities. These are the protein kinase B/mammalian target of rapamycin kinase (Akt/mTor) with the regulators Raptor and Rictor as well as the mitogen activated protein kinases (MAPKs): extra cellular-signal regulated kinase 1 and 2 (ERK1 and ERK2). Striking differences in the placentation site (PS) and the areas aside from PS (peri-PS) were observed. EIF4E and 4E-BP2 truncation as well as 4E-BP1 degradation took place in the endometrium of the peri-PS on PD24. Accompanied by a fragmentation of Akt/mTor, no expression of Rictor was observed, whereas the abundance of Raptor was not altered. On the contrary, MAPKs expression and phosphorylation remained almost stable in the peri-PS. In conclusion, the results indicated that on PD24 the translational regulation was shifted to 4E-BP2 control. Furthermore, the Akt/mTor signaling cascade seemed to be down regulated which suggest reduced phosphorylation of 4E-BP2. Whereas Akt was proteolyzed, the observed mTor fragments represented most likely splicing variants. The results indicate that translational control of gene expression is an important feature in the porcine endometrium during early pregnancy.
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