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Tennakoon M, Senarath K, Kankanamge D, Ratnayake K, Wijayaratna D, Olupothage K, Ubeysinghe S, Martins-Cannavino K, Hébert TE, Karunarathne A. Subtype-dependent regulation of Gβγ signalling. Cell Signal 2021; 82:109947. [PMID: 33582184 PMCID: PMC8026654 DOI: 10.1016/j.cellsig.2021.109947] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 02/01/2021] [Accepted: 02/02/2021] [Indexed: 01/04/2023]
Abstract
G protein-coupled receptors (GPCRs) transmit information to the cell interior by transducing external signals to heterotrimeric G protein subunits, Gα and Gβγ subunits, localized on the inner leaflet of the plasma membrane. Though the initial focus was mainly on Gα-mediated events, Gβγ subunits were later identified as major contributors to GPCR-G protein signalling. A broad functional array of Gβγ signalling has recently been attributed to Gβ and Gγ subtype diversity, comprising 5 Gβ and 12 Gγ subtypes, respectively. In addition to displaying selectivity towards each other to form the Gβγ dimer, numerous studies have identified preferences of distinct Gβγ combinations for specific GPCRs, Gα subtypes and effector molecules. Importantly, Gβ and Gγ subtype-dependent regulation of downstream effectors, representing a diverse range of signalling pathways and physiological functions have been found. Here, we review the literature on the repercussions of Gβ and Gγ subtype diversity on direct and indirect regulation of GPCR/G protein signalling events and their physiological outcomes. Our discussion additionally provides perspective in understanding the intricacies underlying molecular regulation of subtype-specific roles of Gβγ signalling and associated diseases.
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Affiliation(s)
- Mithila Tennakoon
- Department of Chemistry and Biochemistry, The University of Toledo, Toledo, OH 43606, USA
| | - Kanishka Senarath
- Genetics and Molecular Biology Unit, University of Sri Jayewardenepura, Nugegoda, Sri Lanka
| | - Dinesh Kankanamge
- Department of Chemistry and Biochemistry, The University of Toledo, Toledo, OH 43606, USA
| | - Kasun Ratnayake
- Department of Chemistry and Biochemistry, The University of Toledo, Toledo, OH 43606, USA; Department of Pharmacology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Dhanushan Wijayaratna
- Department of Chemistry and Biochemistry, The University of Toledo, Toledo, OH 43606, USA
| | - Koshala Olupothage
- Department of Chemistry and Biochemistry, The University of Toledo, Toledo, OH 43606, USA
| | - Sithurandi Ubeysinghe
- Department of Chemistry and Biochemistry, The University of Toledo, Toledo, OH 43606, USA
| | | | - Terence E Hébert
- Department of Pharmacology and Therapeutics, McGill University, Montréal, QC H3G 1Y6, Canada.
| | - Ajith Karunarathne
- Department of Chemistry and Biochemistry, The University of Toledo, Toledo, OH 43606, USA.
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2
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Tigyi G, Lin KH, Jang IH, Lee SC. Revisiting the role of lysophosphatidic acid in stem cell biology. Exp Biol Med (Maywood) 2021; 246:1802-1809. [PMID: 34038224 DOI: 10.1177/15353702211019283] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Stem cells possess unique biological characteristics such as the ability to self-renew and to undergo multilineage differentiation into specialized cells. Whereas embryonic stem cells (ESC) can differentiate into all cell types of the body, somatic stem cells (SSC) are a population of stem cells located in distinct niches throughout the body that differentiate into the specific cell types of the tissue in which they reside in. SSC function mainly to restore cells as part of normal tissue homeostasis or to replenish cells that are damaged due to injury. Cancer stem-like cells (CSC) are said to be analogous to SSC in this manner where tumor growth and progression as well as metastasis are fueled by a small population of CSC that reside within the corresponding tumor. Moreover, emerging evidence indicates that CSC are inherently resistant to chemo- and radiotherapy that are often the cause of cancer relapse. Hence, major research efforts have been directed at identifying CSC populations in different cancer types and understanding their biology. Many factors are thought to regulate and maintain cell stemness, including bioactive lysophospholipids such as lysophosphatidic acid (LPA). In this review, we discuss some of the newly discovered functions of LPA not only in the regulation of CSC but also normal SSC, the similarities in these regulatory functions, and how these discoveries can pave way to the development of novel therapies in cancer and regenerative medicine.
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Affiliation(s)
- Gábor Tigyi
- Department of Physiology, University of Tennessee Health Science Center Memphis, Memphis, TN 38163, USA
| | - Kuan-Hung Lin
- Department of Physiology, University of Tennessee Health Science Center Memphis, Memphis, TN 38163, USA
| | - Il Ho Jang
- Department of Oral Biochemistry, Pusan National University School of Dentistry, Yangsan 50612, Republic of Korea.,Dental and Life Science Institute, Pusan National University School of Dentistry, Yangsan 50612, Republic of Korea
| | - Sue Chin Lee
- Department of Physiology, University of Tennessee Health Science Center Memphis, Memphis, TN 38163, USA
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3
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S1P/S1P Receptor Signaling in Neuromuscolar Disorders. Int J Mol Sci 2019; 20:ijms20246364. [PMID: 31861214 PMCID: PMC6941007 DOI: 10.3390/ijms20246364] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 12/06/2019] [Accepted: 12/13/2019] [Indexed: 12/13/2022] Open
Abstract
The bioactive sphingolipid metabolite, sphingosine 1-phosphate (S1P), and the signaling pathways triggered by its binding to specific G protein-coupled receptors play a critical regulatory role in many pathophysiological processes, including skeletal muscle and nervous system degeneration. The signaling transduced by S1P binding appears to be much more complex than previously thought, with important implications for clinical applications and for personalized medicine. In particular, the understanding of S1P/S1P receptor signaling functions in specific compartmentalized locations of the cell is worthy of being better investigated, because in various circumstances it might be crucial for the development or/and the progression of neuromuscular diseases, such as Charcot-Marie-Tooth disease, myasthenia gravis, and Duchenne muscular dystrophy.
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4
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Engevik KA, Hanyu H, Matthis AL, Zhang T, Frey MR, Oshima Y, Aihara E, Montrose MH. Trefoil factor 2 activation of CXCR4 requires calcium mobilization to drive epithelial repair in gastric organoids. J Physiol 2019; 597:2673-2690. [PMID: 30912855 PMCID: PMC6826237 DOI: 10.1113/jp277259] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Accepted: 03/21/2019] [Indexed: 12/12/2022] Open
Abstract
KEY POINTS Determining the signalling cascade of epithelial repair, using murine gastric organoids, allows definition of regulatory processes intrinsic to epithelial cells, at the same time as validating and dissecting the signalling cascade with more precision than is possible in vivo Following single cell damage, intracellular calcium selectively increases within cells adjacent to the damage site and is essential for promoting repair. Trefoil factor 2 (TFF2) acts via chemokine C-X-C receptor 4 and epidermal growth factor receptor signalling, including extracellular signal-regulated kinase activation, to drive calcium mobilization and promote gastric repair. Sodium hydrogen exchanger 2, although essential for repair, acts downstream of TFF2 and calcium mobilization. ABSTRACT The gastric mucosa of the stomach is continually exposed to environmental and physiological stress factors that can cause local epithelial damage. Although much is known about the complex nature of gastric wound repair, the stepwise process that characterizes epithelial restitution remains poorly defined. The present study aimed to determine the effectors that drive gastric epithelial repair using a reductionist culture model. To determine the role of trefoil factor 2 (TFF2) and intracellular calcium (Ca2+ ) mobilization in gastric restitution, gastric organoids were derived from TFF2 knockout (KO) mice and yellow Cameleon-Nano15 (fluorescent calcium reporter) transgenic mice, respectively. Inhibitors and recombinant protein were used to determine the upstream and downstream effectors of gastric restitution following photodamage (PD) to single cells within the gastric organoids. Single cell PD resulted in parallel events of dead cell exfoliation and migration of intact neighbouring cells to restore a continuous epithelium in the damage site. Under normal conditions following PD, Ca2+ levels increased within neighbour migrating cells, peaking at ∼1 min, suggesting localized Ca2+ mobilization at the site of cell protrusion/migration. TFF2 KO organoids exhibit delayed repair; however, this delay can be rescued by the addition of exogenous TFF2. Inhibition of epidermal growth factor receptor (EGFR), extracellular signal-regulated kinase (ERK)1/2 or a TFF2 receptor, chemokine C-X-C receptor 4 (CXCR4), resulted in significant delay and dampened Ca2+ mobilization. Inhibition of sodium hydrogen exchanger 2 (NHE2) caused significant delay but did not affect Ca2+ mobilization. A similar delay was observed in NHE2 KO organoids. In TFF2 KO gastric organoids, the addition of exogenous TFF2 in the presence of EGFR or CXCR4 inhibition was unable to rescue repair. The present study demonstrates that intracellular Ca2+ mobilization occurs within gastric epithelial cells adjacent to the damage site to promote repair by mechanisms that involve TFF2 signalling via CXCR4, as well as activation of EGFR and ERK1/2. Furthermore NHE2 is shown to be important for efficient repair and to operate via a mechanism either downstream or independent of calcium mobilization.
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Affiliation(s)
- Kristen A. Engevik
- Department of Pharmacology and Systems PhysiologyUniversity of CincinnatiCincinnatiOHUSA
| | - Hikaru Hanyu
- Department of Pharmacology and Systems PhysiologyUniversity of CincinnatiCincinnatiOHUSA
| | - Andrea L. Matthis
- Department of Pharmacology and Systems PhysiologyUniversity of CincinnatiCincinnatiOHUSA
| | - Tongli Zhang
- Department of Pharmacology and Systems PhysiologyUniversity of CincinnatiCincinnatiOHUSA
| | - Mark R. Frey
- Departments of Pediatrics and Biochemistry and Molecular MedicineUniversity of Southern California Keck School of Medicine/Children's Hospital Los AngelesLos AngelesCAUSA
| | - Yusuke Oshima
- Biomedical Optics LabGraduate School of Biomedical EngineeringTohoku UniversityMiyagiJapan
| | - Eitaro Aihara
- Department of Pharmacology and Systems PhysiologyUniversity of CincinnatiCincinnatiOHUSA
| | - Marshall H. Montrose
- Department of Pharmacology and Systems PhysiologyUniversity of CincinnatiCincinnatiOHUSA
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5
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Lidgerwood GE, Pitson SM, Bonder C, Pébay A. Roles of lysophosphatidic acid and sphingosine-1-phosphate in stem cell biology. Prog Lipid Res 2018; 72:42-54. [PMID: 30196008 DOI: 10.1016/j.plipres.2018.09.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 08/15/2018] [Accepted: 09/05/2018] [Indexed: 02/06/2023]
Abstract
Stem cells are unique in their ability to self-renew and differentiate into various cell types. Because of these features, stem cells are key to the formation of organisms and play fundamental roles in tissue regeneration and repair. Mechanisms controlling their fate are thus fundamental to the development and homeostasis of tissues and organs. Lysophosphatidic acid (LPA) and sphingosine-1-phosphate (S1P) are bioactive phospholipids that play a wide range of roles in multiple cell types, during developmental and pathophysiological events. Considerable evidence now demonstrates the potent roles of LPA and S1P in the biology of pluripotent and adult stem cells, from maintenance to repair. Here we review their roles for each main category of stem cells and explore how those effects impact development and physiopathology.
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Affiliation(s)
- Grace E Lidgerwood
- Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital, East Melbourne, Australia; Ophthalmology, Department of Surgery, the University of Melbourne, Melbourne, Australia
| | - Stuart M Pitson
- Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, Australia
| | - Claudine Bonder
- Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, Australia
| | - Alice Pébay
- Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital, East Melbourne, Australia; Ophthalmology, Department of Surgery, the University of Melbourne, Melbourne, Australia.
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6
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Callihan P, Alqinyah M, Hooks SB. Sphingosine-1-Phosphate (S1P) Signaling in Neural Progenitors. Methods Mol Biol 2018; 1697:141-151. [PMID: 28361481 DOI: 10.1007/7651_2017_3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
Sphingosine-1-phosphate (S1P) and its receptors are important in nervous system development. Reliable in vitro human model systems are needed to further define specific roles for S1P signaling in neural development. We have described S1P-regulated signaling, survival, and differentiation in a human embryonic stem cell-derived neuroepithelial progenitor cell line (hNP1) that expresses functional S1P receptors. These cells can be further differentiated to a neuronal cell type and therefore represent a good model system to study the role of S1P signaling in human neural development. The following sections describe in detail the culture and differentiation of hNP1 cells and two assays to measure S1P signaling in these cells.
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Affiliation(s)
- Phillip Callihan
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, Athens, GA, USA
| | - Mohammed Alqinyah
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, Athens, GA, USA
| | - Shelley B Hooks
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, Athens, GA, USA. .,, 250 West Green Street, 338 Pharmacy South, Athens, GA, 60602, USA.
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7
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Medelnik JP, Roensch K, Okawa S, Del Sol A, Chara O, Mchedlishvili L, Tanaka EM. Signaling-Dependent Control of Apical Membrane Size and Self-Renewal in Rosette-Stage Human Neuroepithelial Stem Cells. Stem Cell Reports 2018; 10:1751-1765. [PMID: 29779899 PMCID: PMC5993681 DOI: 10.1016/j.stemcr.2018.04.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 04/20/2018] [Accepted: 04/20/2018] [Indexed: 12/12/2022] Open
Abstract
In the developing nervous system, neural stem cells are polarized and maintain an apical domain facing a central lumen. The presence of apical membrane is thought to have a profound influence on maintaining the stem cell state. With the onset of neurogenesis, cells lose their polarization, and the concomitant loss of the apical domain coincides with a loss of the stem cell identity. Little is known about the molecular signals controlling apical membrane size. Here, we use two neuroepithelial cell systems, one derived from regenerating axolotl spinal cord and the other from human embryonic stem cells, to identify a molecular signaling pathway initiated by lysophosphatidic acid that controls apical membrane size and consequently controls and maintains epithelial organization and lumen size in neuroepithelial rosettes. This apical domain size increase occurs independently of effects on proliferation and involves a serum response factor-dependent transcriptional induction of junctional and apical membrane components.
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Affiliation(s)
- Jan-Philip Medelnik
- Research Institute for Molecular Pathology (IMP), Vienna Biocenter (VBC), Campus-Vienna-Biocenter 1, 1030 Vienna, Austria; DFG Research Center for Regenerative Therapies, Technische Universität Dresden, Fetscherstraße 105, 01307 Dresden, Germany; Max Planck Institute of Molecular Cell Biology and Genetics, Pfotenhauerstraße 108, 01307 Dresden, Germany.
| | - Kathleen Roensch
- DFG Research Center for Regenerative Therapies, Technische Universität Dresden, Fetscherstraße 105, 01307 Dresden, Germany; Max Planck Institute of Molecular Cell Biology and Genetics, Pfotenhauerstraße 108, 01307 Dresden, Germany
| | - Satoshi Okawa
- Computational Biology Group, Luxembourg Centre for Systems Biomedicine, University of Luxembourg, 6, Avenue du Swing, Belvaux 4367, Luxembourg
| | - Antonio Del Sol
- Computational Biology Group, Luxembourg Centre for Systems Biomedicine, University of Luxembourg, 6, Avenue du Swing, Belvaux 4367, Luxembourg
| | - Osvaldo Chara
- Center for Information Services and High Performance Computing (ZIH), Technische Universität Dresden, 01062 Dresden, Germany; Systems Biology Group (SysBio), Instituto de Física de Líquidos y Sistemas Biológicos (IFLySIB), CONICET, Universidad Nacional de La Plata (UNLP), B1900BTE, La Plata, Argentina
| | - Levan Mchedlishvili
- DFG Research Center for Regenerative Therapies, Technische Universität Dresden, Fetscherstraße 105, 01307 Dresden, Germany; Max Planck Institute of Molecular Cell Biology and Genetics, Pfotenhauerstraße 108, 01307 Dresden, Germany
| | - Elly M Tanaka
- Research Institute for Molecular Pathology (IMP), Vienna Biocenter (VBC), Campus-Vienna-Biocenter 1, 1030 Vienna, Austria; DFG Research Center for Regenerative Therapies, Technische Universität Dresden, Fetscherstraße 105, 01307 Dresden, Germany; Max Planck Institute of Molecular Cell Biology and Genetics, Pfotenhauerstraße 108, 01307 Dresden, Germany
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8
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Hunter M, Demarais NJ, Faull RLM, Grey AC, Curtis MA. Layer-specific lipid signatures in the human subventricular zone demonstrated by imaging mass spectrometry. Sci Rep 2018; 8:2551. [PMID: 29416059 PMCID: PMC5803191 DOI: 10.1038/s41598-018-20793-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Accepted: 01/19/2018] [Indexed: 02/01/2023] Open
Abstract
The subventricular zone is a key site of adult neurogenesis and is also implicated in neurodegenerative diseases and brain cancers. In the subventricular zone, cell proliferation, migration and differentiation of nascent stem cells and neuroblasts are regulated at least in part by lipids. The human subventricular zone is distinctly layered and each layer contains discrete cell types that support the processes of neuroblast migration and neurogenesis. We set out to determine the lipid signatures of each subventricular layer in the adult human brain (n = 4). We utilised matrix-assisted laser desorption/ionisation (MALDI) imaging mass spectrometry and liquid chromatography-mass spectrometry to characterise the lipidome of the subventricular zone, with histology and microscopy used for identifying anatomical landmarks. Our findings showed that the subventricular zone was rich in sphingomyelins and phosphatidylserines but deficient in phosphatidylethanolamines. The ependymal layer had an abundance of phosphatidylinositols, whereas the myelin layer was rich in sulfatides and triglycerides. The hypocellular layer showed enrichment of sphingomyelins. No discrete lipid signature was seen in the astrocytic ribbon. The biochemical functions of these lipid classes are consistent with the localisation we observed within the SVZ. Our study may, therefore, shed new light on the role of lipids in the regulation of adult neurogenesis.
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Affiliation(s)
- Mandana Hunter
- Centre for Brain Research, University of Auckland, Auckland, 1023, New Zealand.,Department of Pharmacology and Clinical Pharmacology, Faculty of Medical and Health Sciences, University of Auckland, Auckland, 1023, New Zealand
| | - Nicholas J Demarais
- School of Biological Sciences, Faculty of Science, University of Auckland, Auckland, 1010, New Zealand
| | - Richard L M Faull
- Centre for Brain Research, University of Auckland, Auckland, 1023, New Zealand.,Department of Anatomy and Medical Imaging, Faculty of Medical and Health Sciences, University of Auckland, Auckland, 1023, New Zealand
| | - Angus C Grey
- Centre for Brain Research, University of Auckland, Auckland, 1023, New Zealand.,Department of Physiology, Faculty of Medical and Health Sciences, University of Auckland, Auckland, 1023, New Zealand
| | - Maurice A Curtis
- Centre for Brain Research, University of Auckland, Auckland, 1023, New Zealand. .,Department of Anatomy and Medical Imaging, Faculty of Medical and Health Sciences, University of Auckland, Auckland, 1023, New Zealand.
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9
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Kucharska-Mazur J, Jabłoński M, Misiak B, Frydecka D, Rybakowski J, Ratajczak MZ, Samochowiec J. Adult stem cells in psychiatric disorders - New discoveries in peripheral blood. Prog Neuropsychopharmacol Biol Psychiatry 2018; 80:23-27. [PMID: 28392482 DOI: 10.1016/j.pnpbp.2017.04.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 03/28/2017] [Accepted: 04/05/2017] [Indexed: 12/15/2022]
Abstract
The new area of research in psychiatric disorders is concerned with abnormal regeneration processes. The role of brain neurogenesis has been studied for decades. New discoveries, concerned with the pluripotency of VSEL cells and the role of factors involved in stem cell trafficking in peripheral blood create hope that it will be possible to develop a better understanding of the processes of neuroregeneration/neurodegeneration. There is an ongoing research investigating concentrations of: sphingosine -1-phosphate, SDF-1, elements of complement cascade, and stem cells in peripheral blood, including their possible connection to psychiatric disorders. Collected data, suggesting an abnormal course of regeneration processes in psychiatric disorders, raises hope of finding new potential markers of psychosis and anxiety disorders.
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Affiliation(s)
- Jolanta Kucharska-Mazur
- Department of Psychiatry, Pomeranian University of Medicine, Broniewskiego 26, 71-460 Szczecin, Poland
| | - Marcin Jabłoński
- Department of Psychiatry, Pomeranian University of Medicine, Broniewskiego 26, 71-460 Szczecin, Poland
| | - Błażej Misiak
- Department of Genetics, Wroclaw Medical University, Marcinkowskiego 1, 50-368 Wrocław, Poland
| | - Dorota Frydecka
- Department of Psychiatry, Wroclaw Medical University, Pasteur 10, 50-367 Wroclaw, Poland
| | - Janusz Rybakowski
- Department of Adult Psychiatry, Poznan University of Medical Sciences, Szpitalna 27/33, 60-572 Poznan, Poland
| | | | - Jerzy Samochowiec
- Department of Psychiatry, Pomeranian University of Medicine, Broniewskiego 26, 71-460 Szczecin, Poland.
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10
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Gardner NM, Riley RT, Showker JL, Voss KA, Sachs AJ, Maddox JR, Gelineau-van Waes JB. Elevated Nuclear and Cytoplasmic FTY720-Phosphate in Mouse Embryonic Fibroblasts Suggests the Potential for Multiple Mechanisms in FTY720-Induced Neural Tube Defects. Toxicol Sci 2015; 150:161-8. [PMID: 26719367 DOI: 10.1093/toxsci/kfv321] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
FTY720 (fingolimod) is a U.S. Food and Drug Administration-approved drug to treat relapsing remitting multiple sclerosis. FTY720 treatment in pregnant inbred LM/Bc mice results in approximately 60% of embryos having a neural tube defect (NTD). Sphingosine kinases (Sphk1, Sphk2) phosphorylate FTY720 in vivo to form the bioactive metabolite FTY720-1-phosphate (FTY720-P). Cytoplasmic FTY720-P is an agonist for 4 of the 5 sphingosine-1-phosphate (S1P) receptors (S1P1, 3-5) and can also act as a functional antagonist of S1P1, whereas FTY720-P generated in the nucleus inhibits histone deacetylases (HDACs), leading to increased histone acetylation. This study demonstrates that treatment of LM/Bc mouse embryonic fibroblasts (MEFs) with FTY720 results in a significant accumulation of FTY720-P in both the cytoplasmic and nuclear compartments. Elevated nuclear FTY720-P is associated with decreased HDAC activity and increased histone acetylation at H3K18 and H3K23 in LM/Bc MEFs. Treatment of LM/Bc MEFs with FTY720 and a selective Sphk2 inhibitor, ABC294640, significantly reduces the amount of FTY720-P that accumulates in the nucleus. The data provide insight into the relative amounts of FTY720-P generated in the nuclear versus cytoplasmic subcellular compartments after FTY720 treatment and the specific Sphk isoforms involved. The results of this study suggest that FTY720-induced NTDs may involve multiple mechanisms, including: (1) sustained and/or altered S1P receptor activation and signaling by FTY720-P produced in the cytoplasm and (2) HDAC inhibition and histone hyperacetylation by FTY720-P generated in the nucleus that could lead to epigenetic changes in gene regulation.
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Affiliation(s)
- Nicole M Gardner
- *Department of Pharmacology, Creighton University School of Medicine, Omaha, Nebraska 68178 and
| | - Ronald T Riley
- USDA-ARS, Toxicology and Mycotoxin Research Unit, Athens, Georgia 30605
| | - Jency L Showker
- USDA-ARS, Toxicology and Mycotoxin Research Unit, Athens, Georgia 30605
| | - Kenneth A Voss
- USDA-ARS, Toxicology and Mycotoxin Research Unit, Athens, Georgia 30605
| | - Andrew J Sachs
- *Department of Pharmacology, Creighton University School of Medicine, Omaha, Nebraska 68178 and
| | - Joyce R Maddox
- *Department of Pharmacology, Creighton University School of Medicine, Omaha, Nebraska 68178 and
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11
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Riley RT, Torres O, Matute J, Gregory SG, Ashley-Koch AE, Showker JL, Mitchell T, Voss KA, Maddox JR, Gelineau-van Waes JB. Evidence for fumonisin inhibition of ceramide synthase in humans consuming maize-based foods and living in high exposure communities in Guatemala. Mol Nutr Food Res 2015; 59:2209-24. [PMID: 26264677 DOI: 10.1002/mnfr.201500499] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Revised: 07/31/2015] [Accepted: 08/04/2015] [Indexed: 11/12/2022]
Abstract
SCOPE Fumonisin (FB) occurs in maize and is an inhibitor of ceramide synthase (CerS). We determined the urinary FB1 (UFB1 ) and sphingoid base 1-phosphate levels in blood from women consuming maize in high and low FB exposure communities in Guatemala. METHODS AND RESULTS FB1 intake was estimated using the UFB1 . Sphinganine 1-phosphate (Sa 1-P), sphingosine 1-phosphate (So 1-P), and the Sa 1-P/So 1-P ratio were determined in blood spots collected on absorbent paper at the same time as urine collection. In the first study, blood spots and urine were collected every 3 months (March 2011 to February 2012) from women living in low (Chimaltenango and Escuintla) and high (Jutiapa) FB exposure communities (1240 total recruits). The UFB1 , Sa 1-P/So 1-P ratio, and Sa 1-P/mL in blood spots were significantly higher in the high FB1 intake community compared to the low FB1 intake communities. The results were confirmed in a follow-up study (February 2013) involving 299 women living in low (Sacatepéquez) and high (Santa Rosa and Chiquimula) FB exposure communities. CONCLUSIONS High levels of FB1 intake are correlated with changes in Sa 1-P and the Sa 1-P/So 1-P ratio in human blood in a manner consistent with FB1 inhibition of CerS.
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Affiliation(s)
- Ronald T Riley
- Toxicology and Mycotoxin Research Unit, US National Poultry Research Center, USDA - ARS, R.B. Russell Research Center, Athens, GA, USA
| | - Olga Torres
- Laboratorio Diagnostico Molecular S.A, Guatemala City, Guatemala.,Centro de Investigaciones en Nutrición y Salud, Guatemala City, Guatemala
| | - Jorge Matute
- Centro de Investigaciones en Nutrición y Salud, Guatemala City, Guatemala
| | - Simon G Gregory
- Department of Medicine, Duke University Medical Center, Durham, NC, USA
| | | | - Jency L Showker
- Toxicology and Mycotoxin Research Unit, US National Poultry Research Center, USDA - ARS, R.B. Russell Research Center, Athens, GA, USA
| | - Trevor Mitchell
- Toxicology and Mycotoxin Research Unit, US National Poultry Research Center, USDA - ARS, R.B. Russell Research Center, Athens, GA, USA
| | - Kenneth A Voss
- Toxicology and Mycotoxin Research Unit, US National Poultry Research Center, USDA - ARS, R.B. Russell Research Center, Athens, GA, USA
| | - Joyce R Maddox
- Department of Pharmacology, School of Medicine, Creighton University, Omaha, NE, USA
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12
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Tabuchi S. The autotaxin-lysophosphatidic acid-lysophosphatidic acid receptor cascade: proposal of a novel potential therapeutic target for treating glioblastoma multiforme. Lipids Health Dis 2015; 14:56. [PMID: 26084470 PMCID: PMC4477515 DOI: 10.1186/s12944-015-0059-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Accepted: 06/12/2015] [Indexed: 12/29/2022] Open
Abstract
Glioblastoma multiforme (GBM) is the most malignant tumor of the central nervous system (CNS). Its prognosis is one of the worst among all cancer types, and it is considered a fatal malignancy, incurable with conventional therapeutic strategies. As the bioactive multifunctional lipid mediator lysophosphatidic acid (LPA) is well recognized to be involved in the tumorigenesis of cancers by acting on G-protein-coupled receptors, LPA receptor (LPAR) antagonists and LPA synthesis inhibitors have been proposed as promising drugs for cancer treatment. Six LPARs, named LPA1-6, are currently recognized. Among them, LPA1 is the dominant LPAR in the CNS and is highly expressed in GBM in combination with the overexpression of autotaxin (ATX), the enzyme (a phosphodiesterase, which is a potent cell motility-stimulating factor) that produces LPA.Invasion is a defining hallmark of GBM. LPA is significantly related to cell adhesion, cell motility, and invasion through the Rho family GTPases Rho and Rac. LPA1 is responsible for LPA-driven cell motility, which is attenuated by LPA4. GBM is among the most vascular human tumors. Although anti-angiogenic therapy (through the inhibition of vascular endothelial growth factor (VEGF)) was established, sufficient results have not been obtained because of the increased invasiveness triggered by anti-angiogenesis. As both ATX and LPA play a significant role in angiogenesis, similar to VEGF, inhibition of the ATX/LPA axis may be beneficial as a two-pronged therapy that includes anti-angiogenic and anti-invasion therapy. Conventional approaches to GBM are predominantly directed at cell proliferation. Recurrent tumors regrow from cells that have invaded brain tissues and are less proliferative, and are thus quite resistant to conventional drugs and radiation, which preferentially kill rapidly proliferating cells. A novel approach that targets this invasive subpopulation of GBM cells may improve the prognosis of GBM. Patients with GBM that contacts the subventricular zone (SVZ) have decreased survival. A putative source of GBM cells is the SVZ, the largest area of neurogenesis in the adult human brain. GBM stem cells in the SVZ that are positive for the neural stem cell surface antigen CD133 are highly tumorigenic and enriched in recurrent GBM. LPA1 expression appears to be increased in these cells. Here, the author reviews research on the ATX/LPAR axis, focusing on GBM and an ATX/LPAR-targeted approach.
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Affiliation(s)
- Sadaharu Tabuchi
- Department of Neurosurgery, Tottori Prefectural Central Hospital, 730 Ezu, Tottori, 680-0901, Japan.
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13
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Greenman R, Gorelik A, Sapir T, Baumgart J, Zamor V, Segal-Salto M, Levin-Zaidman S, Aidinis V, Aoki J, Nitsch R, Vogt J, Reiner O. Non-cell autonomous and non-catalytic activities of ATX in the developing brain. Front Neurosci 2015; 9:53. [PMID: 25788872 PMCID: PMC4349085 DOI: 10.3389/fnins.2015.00053] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2014] [Accepted: 02/06/2015] [Indexed: 12/20/2022] Open
Abstract
The intricate formation of the cerebral cortex requires a well-coordinated series of events, which are regulated at the level of cell-autonomous and non-cell autonomous mechanisms. Whereas cell-autonomous mechanisms that regulate cortical development are well-studied, the non-cell autonomous mechanisms remain poorly understood. A non-biased screen allowed us to identify Autotaxin (ATX) as a non-cell autonomous regulator of neural stem cells. ATX (also known as ENPP2) is best known to catalyze lysophosphatidic acid (LPA) production. Our results demonstrate that ATX affects the localization and adhesion of neuronal progenitors in a cell autonomous and non-cell autonomous manner, and strikingly, this activity is independent from its catalytic activity in producing LPA.
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Affiliation(s)
- Raanan Greenman
- Department of Molecular Genetics, Weizmann Institute of Science Rehovot, Israel
| | - Anna Gorelik
- Department of Molecular Genetics, Weizmann Institute of Science Rehovot, Israel
| | - Tamar Sapir
- Department of Molecular Genetics, Weizmann Institute of Science Rehovot, Israel
| | - Jan Baumgart
- University Medical Center, Institute for Microscopic Anatomy and Neurobiology, Johannes Gutenberg-University Mainz Mainz, Germany ; Central Laboratory Animal Facility, University Medical Center, Johannes Gutenberg-University Mainz Mainz, Germany
| | - Vanessa Zamor
- Department of Molecular Genetics, Weizmann Institute of Science Rehovot, Israel
| | - Michal Segal-Salto
- Department of Molecular Genetics, Weizmann Institute of Science Rehovot, Israel
| | - Smadar Levin-Zaidman
- Department of Chemical Research Support, Weizmann Institute of Science Rehovot, Israel
| | - Vassilis Aidinis
- Division of Immunology, Biomedical Sciences Research Center 'Alexander Fleming' Athens, Greece
| | - Junken Aoki
- Graduate School of Pharmaceutical Sciences, Tohoku University Miyagi, Japan
| | - Robert Nitsch
- University Medical Center, Institute for Microscopic Anatomy and Neurobiology, Johannes Gutenberg-University Mainz Mainz, Germany
| | - Johannes Vogt
- University Medical Center, Institute for Microscopic Anatomy and Neurobiology, Johannes Gutenberg-University Mainz Mainz, Germany
| | - Orly Reiner
- Department of Molecular Genetics, Weizmann Institute of Science Rehovot, Israel
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14
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Callihan P, Ali MW, Salazar H, Quach N, Wu X, Stice SL, Hooks SB. Convergent regulation of neuronal differentiation and Erk and Akt kinases in human neural progenitor cells by lysophosphatidic acid, sphingosine 1-phosphate, and LIF: specific roles for the LPA1 receptor. ASN Neuro 2014; 6:6/6/1759091414558416. [PMID: 25424429 PMCID: PMC4357610 DOI: 10.1177/1759091414558416] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The bioactive lysophospholipids lysophosphatidic acid (LPA) and sphingosine 1-phosphate (S1P) have diverse effects on the developing nervous system and neural progenitors, but the molecular basis for their pleiotropic effects is poorly understood. We previously defined LPA and S1P signaling in proliferating human neural progenitor (hNP) cells, and the current study investigates their role in neuronal differentiation of these cells. Differentiation in the presence of LPA or S1P significantly enhanced cell survival and decreased expression of neuronal markers. Further, the LPA receptor antagonist Ki16425 fully blocked the effects of LPA, and differentiation in the presence of Ki16425 dramatically enhanced neurite length. LPA and S1P robustly activated Erk, but surprisingly both strongly suppressed Akt activation. Ki16425 and pertussis toxin blocked LPA activation of Erk but not LPA inhibition of Akt, suggesting distinct receptor and G-protein subtypes mediate these effects. Finally, we explored cross talk between lysophospholipid signaling and the cytokine leukemia inhibitory factor (LIF). LPA/S1P effects on neuronal differentiation were amplified in the presence of LIF. Similarly, the ability of LPA/S1P to regulate Erk and Akt was impacted by the presence of LIF; LIF enhanced the inhibitory effect of LPA/S1P on Akt phosphorylation, while LIF blunted the activation of Erk by LPA/S1P. Taken together, our results suggest that LPA and S1P enhance survival and inhibit neuronal differentiation of hNP cells, and LPA1 is critical for the effect of LPA. The pleiotropic effects of LPA may reflect differences in receptor subtype expression or cross talk with LIF receptor signaling.
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Affiliation(s)
- Phillip Callihan
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, Athens, GA, USA
| | - Mourad W Ali
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, Athens, GA, USA
| | - Hector Salazar
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, Athens, GA, USA
| | - Nhat Quach
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, Athens, GA, USA
| | - Xian Wu
- Department of Animal and Dairy Science, Regenerative Bioscience Center, University of Georgia, Athens, GA, USA
| | - Steven L Stice
- Department of Animal and Dairy Science, Regenerative Bioscience Center, University of Georgia, Athens, GA, USA
| | - Shelley B Hooks
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, Athens, GA, USA
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15
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Pan HY, Yang H, Shao MY, Xu J, Zhang P, Cheng R, Hu T. Sphingosine-1-phosphate mediates AKT/ERK maintenance of dental pulp homoeostasis. Int Endod J 2014; 48:460-8. [PMID: 24931601 DOI: 10.1111/iej.12335] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2013] [Accepted: 06/11/2014] [Indexed: 02/05/2023]
Abstract
AIM To investigate the cell status of dental pulp cells (DPCs) in a sphingosine-1-phosphate (S1P)-induced microinflammation environment and the possible mechanisms of cell homoeostasis maintenance by S1P. METHODOLOGY Sphingosine-1-phosphate receptor (S1PR) expression was examined in DPCs within a local S1P-induced microinflammation model established using 1 μmol L(-1) S1P. U0126 [extracellular signal-regulated kinase (ERK) inhibitor], LY294002 (AKT inhibitor) and Y27632 (ROCK inhibitor) were used to inhibit corresponding signalling pathways of DPCs. CCK8 and cell cycle analysis tested cell proliferation. Immunofluorescence staining JC-1 detected changes of mitochondrial membrane potential (ΔΨm). Tests for apoptosis and the apoptosis-related proteins Bax and Bcl-2 were assessed by flow cytometry and western blot analysis, respectively. Expressions of ERK and AKT were evaluated by western blot analysis. The results were analysed using the Student's t-test and the significance level set at P < 0.05. RESULTS Expressions of S1PR1, S1PR2 and S1PR3 in DPCs differed amongst individuals. DPCs maintained self-homoeostasis in response to S1P-induced microinflammation via S1PRs. During this repair process, ERK, AKT and ROCK had a short-term complementary interaction at 60 min, but then AKT and ERK gradually played decisive roles after 24 h in proliferation enhancement and apoptosis inhibition, respectively (P > 0.05). CONCLUSIONS The AKT-ERK balance may determine whether DPC homoeostasis in S1P-induced microinflammation is maintained by synergistic regulation of cell growth and apoptosis.
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Affiliation(s)
- H Y Pan
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
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16
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Tuggle K, Ali MW, Salazar H, Hooks SB. Regulator of G protein signaling transcript expression in human neural progenitor differentiation: R7 subfamily regulation by DNA methylation. Neurosignals 2014; 22:43-51. [PMID: 24903911 DOI: 10.1159/000362128] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Accepted: 03/10/2014] [Indexed: 11/19/2022] Open
Abstract
G protein-coupled receptors (GPCRs) and their ligands are critical regulators of neural progenitor differentiation, and GPCR signaling pathways are regulated by regulator of G protein signaling (RGS) proteins. RGS protein expression is dynamically regulated, and we have recently described the epigenetic regulation of RGS transcript expression. Given the potential of RGS proteins to regulate GPCR signaling and the established role of epigenetic regulation in progenitor differentiation, we explored the impact of epigenetic regulation of RGS transcripts during in vitro differentiation of human neural progenitors. Here, we demonstrate robust upregulation of the RGS transcripts RGS4, RGS5, RGS6, RGS7, and RGS11 during neuronal differentiation, while DNA methyltransferase (DNMT) and histone deacetylase enzyme expression is suppressed during differentiation. Transcripts encoding R7 subfamily RGS proteins and the R7-binding partners R7BP and R9AP showed the greatest upregulation. Further, we showed that direct pharmacological inhibition of DNMT activity enhances expression of RGS2, RGS4, RGS5, RGS6, RGS7, RGS8, RGS9L, RGS10, and RGS14 as well as R7BP and R9AP transcripts in progenitors, consistent with regulation by DNMTs. Our results reveal marked upregulation of RGS expression during neuronal differentiation and suggest that decreased expression of DNMT enzymes during differentiation contributes to upregulation.
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Affiliation(s)
- Katie Tuggle
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, Athens, Ga., USA
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17
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Kucharska-Mazur J, Tarnowski M, Dołęgowska B, Budkowska M, Pędziwiatr D, Jabłoński M, Pełka-Wysiecka J, Kazimierczak A, Ratajczak MZ, Samochowiec J. Novel evidence for enhanced stem cell trafficking in antipsychotic-naïve subjects during their first psychotic episode. J Psychiatr Res 2014; 49:18-24. [PMID: 24246416 DOI: 10.1016/j.jpsychires.2013.10.016] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2013] [Revised: 10/23/2013] [Accepted: 10/23/2013] [Indexed: 12/18/2022]
Abstract
In this study, we tested the novel hypothesis that stem cells and those factors that modulate their trafficking may be biological markers for acute psychosis. Twenty-eight subjects during their first nonaffective psychotic episode were investigated before and after antipsychotic treatment and were compared with 35 healthy controls (CG); the psychotic group (PG) was divided into "schizophrenic" (SG) and "non-schizophrenic" (NG) subgroups. We examined the number of circulating Lin(-)/CD45(-)/CD34(+) and Lin(-)/CD45(-)/CD133(+) very small embryonic-like stem cells (VSELs), which express markers of the neural lineage, and also the plasma levels of factors that modulate their trafficking: the C3a, C5a, and C5b-9 activated complement cascade components, stromal-derived factor 1, and sphingosine-1-phosphate (S1P). We found that the mean numbers of Lin(-)/CD45(-)/CD34(+) VSELs and the plasma levels of S1P prior to treatment differ between the CG and PG and that these cells express markers of neural lineage. The number of Lin(-)/CD45(-)/CD133(+) VSELs in peripheral blood differed between the SG and NG prior to treatment. Using logistic regression analysis, we found that C3a and S1P are the best predictors of risk and are potential markers for the first psychotic episode. Furthermore, in the SG, the number of circulating Lin(-)/CD45(-)/CD34(+) VSELs and the S1P plasma level are the best predictors of risk and are proposed as novel markers for the first "schizophrenic" episode of psychosis.
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Affiliation(s)
| | - Maciej Tarnowski
- Department of Physiology, Pomeranian University of Medicine, Szczecin, Poland
| | - Barbara Dołęgowska
- Department of Medical Analytics, Pomeranian University of Medicine, Szczecin, Poland
| | - Marta Budkowska
- Department of Medical Analytics, Pomeranian University of Medicine, Szczecin, Poland
| | - Daniel Pędziwiatr
- Department of Physiology, Pomeranian University of Medicine, Szczecin, Poland
| | - Marcin Jabłoński
- Department of Psychiatry, Pomeranian University of Medicine, Szczecin, Poland
| | | | | | - Mariusz Z Ratajczak
- Department of Physiology, Pomeranian University of Medicine, Szczecin, Poland; Stem Cell Biology Program at the James Graham Brown Cancer Center, University of Louisville, Louisville, KY 40202, USA
| | - Jerzy Samochowiec
- Department of Psychiatry, Pomeranian University of Medicine, Szczecin, Poland.
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18
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Sphingosine Phosphate Lyase Regulates Murine Embryonic Stem Cell Proliferation and Pluripotency through an S1P 2/STAT3 Signaling Pathway. Biomolecules 2013; 3:351-368. [PMID: 24619572 PMCID: PMC3947625 DOI: 10.3390/biom3030351] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Sphingosine-1-phosphate (S1P) is a bioactive sphingolipid that activates a family of G protein coupled-receptors (GPCRs) implicated in mammalian development, angiogenesis, immunity and tissue regeneration. S1P functions as a trophic factor for many cell types, including embryonic stem cells (ESCs). Sphingosine phosphate lyase (SPL) is an intracellular enzyme that catalyzes the irreversible degradation of S1P. We found SPL to be highly expressed in murine ESCs (mESCs). To investigate the role of SPL in mESC biology, we silenced SPL in mESCs via stable transfection with a lentiviral SPL-specific short hairpin RNA (shRNA) construct. SPL-knockdown (SPL-KD) mESCs showed a 5-fold increase in cellular S1P levels, increased proliferation rates and high expression of cell surface pluripotency markers SSEA1 and OCT4 compared to vector control cells. Compared to control mESCs, SPL-KD cells showed robust activation of STAT3 and a 10-fold increase in S1P2 expression. Inhibition of S1P2 or STAT3 reversed the proliferation and pluripotency phenotypes of SPL-KD mESCs. Further, inhibition of S1P2 attenuated, in a dose-dependent fashion, the high levels of OCT4 and STAT3 activation observed in SPL-KD mESCs. Finally, we showed that SPL-KD cells are capable of generating embryoid bodies from which muscle stem cells, called satellite cells, can be isolated. These findings demonstrate an important role for SPL in ESC homeostasis and suggest that SPL inhibition could facilitate ex vivo ESC expansion for therapeutic purposes.
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19
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Frisca F, Crombie DE, Dottori M, Goldshmit Y, Pébay A. Rho/ROCK pathway is essential to the expansion, differentiation, and morphological rearrangements of human neural stem/progenitor cells induced by lysophosphatidic acid. J Lipid Res 2013; 54:1192-206. [PMID: 23463731 PMCID: PMC3622317 DOI: 10.1194/jlr.m032284] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2012] [Revised: 03/01/2013] [Indexed: 11/20/2022] Open
Abstract
We previously reported that lysophosphatidic acid (LPA) inhibits the neuronal differentiation of human embryonic stem cells (hESC). We extended these studies by analyzing LPA's effects on the expansion of neural stem/progenitor cells (NS/PC) derived from hESCs and human induced pluripotent stem cells (iPSC), and we assessed whether data obtained on the neural differentiation of hESCs were relevant to iPSCs. We showed that hESCs and iPSCs exhibited comparable mRNA expression profiles of LPA receptors and producing enzymes upon neural differentiation. We demonstrated that LPA inhibited the expansion of NS/PCs of both origins, mainly by increased apoptosis in a Rho/Rho-associated kinase (ROCK)-dependent mechanism. Furthermore, LPA inhibited the neuronal differentiation of iPSCs. Lastly, LPA induced neurite retraction of NS/PC-derived early neurons through Rho/ROCK, which was accompanied by myosin light chain (MLC) phosphorylation. Our data demonstrate the consistency of LPA effects across various sources of human NS/PCs, rendering hESCs and iPSCs valuable models for studying lysophospholipid signaling in human neural cells. Our data also highlight the importance of the Rho/ROCK pathway in human NS/PCs. As LPA levels are increased in the central nervous system (CNS) following injury, LPA-mediated effects on NS/PCs and early neurons could contribute to the poor neurogenesis observed in the CNS following injury.
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Affiliation(s)
- Frisca Frisca
- Department of Ophthalmology, University of Melbourne, East Melbourne VIC, Australia
| | - Duncan E. Crombie
- Department of Ophthalmology, University of Melbourne, East Melbourne VIC, Australia
- Centre for Eye Research, Australia & Royal Victorian Eye and Ear Hospital, East Melbourne VIC, Australia
| | - Mirella Dottori
- Department of Anatomy and Neurosciences, University of Melbourne, Parkville VIC, Australia; and
| | - Yona Goldshmit
- Centre for Eye Research, Australia & Royal Victorian Eye and Ear Hospital, East Melbourne VIC, Australia
- Australian Regenerative Medicine Institute, Monash University, Clayton, VIC, Australia
| | - Alice Pébay
- Department of Ophthalmology, University of Melbourne, East Melbourne VIC, Australia
- Centre for Eye Research, Australia & Royal Victorian Eye and Ear Hospital, East Melbourne VIC, Australia
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20
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Khan SM, Sleno R, Gora S, Zylbergold P, Laverdure JP, Labbé JC, Miller GJ, Hébert TE. The expanding roles of Gβγ subunits in G protein-coupled receptor signaling and drug action. Pharmacol Rev 2013; 65:545-77. [PMID: 23406670 DOI: 10.1124/pr.111.005603] [Citation(s) in RCA: 172] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Gβγ subunits from heterotrimeric G proteins perform a vast array of functions in cells with respect to signaling, often independently as well as in concert with Gα subunits. However, the eponymous term "Gβγ" does not do justice to the fact that 5 Gβ and 12 Gγ isoforms have evolved in mammals to serve much broader roles beyond their canonical roles in cellular signaling. We explore the phylogenetic diversity of Gβγ subunits with a view toward understanding these expanded roles in different cellular organelles. We suggest that the particular content of distinct Gβγ subunits regulates cellular activity, and that the granularity of individual Gβ and Gγ action is only beginning to be understood. Given the therapeutic potential of targeting Gβγ action, this larger view serves as a prelude to more specific development of drugs aimed at individual isoforms.
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Affiliation(s)
- Shahriar M Khan
- Department of Pharmacology and Therapeutics, McGill University, 3655 Promenade Sir-William-Osler, Room 1303, Montréal, Québec H3G 1Y6, Canada
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21
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Gelineau-van Waes J, Rainey MA, Maddox JR, Voss KA, Sachs AJ, Gardner NM, Wilberding JD, Riley RT. Increased sphingoid base-1-phosphates and failure of neural tube closure after exposure to fumonisin or FTY720. ACTA ACUST UNITED AC 2012; 94:790-803. [DOI: 10.1002/bdra.23074] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2012] [Revised: 06/12/2012] [Accepted: 07/23/2012] [Indexed: 12/30/2022]
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22
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Bieberich E. It's a lipid's world: bioactive lipid metabolism and signaling in neural stem cell differentiation. Neurochem Res 2012; 37:1208-29. [PMID: 22246226 DOI: 10.1007/s11064-011-0698-5] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2011] [Accepted: 12/31/2011] [Indexed: 01/20/2023]
Abstract
Lipids are often considered membrane components whose function is to embed proteins into cell membranes. In the last two decades, studies on brain lipids have unequivocally demonstrated that many lipids have critical cell signaling functions; they are called "bioactive lipids". Pioneering work in Dr. Robert Ledeen's laboratory has shown that two bioactive brain sphingolipids, sphingomyelin and the ganglioside GM1 are major signaling lipids in the nuclear envelope. In addition to derivatives of the sphingolipid ceramide, the bioactive lipids discussed here belong to the classes of terpenoids and steroids, eicosanoids, and lysophospholipids. These lipids act mainly through two mechanisms: (1) direct interaction between the bioactive lipid and a specific protein binding partner such as a lipid receptor, protein kinase or phosphatase, ion exchanger, or other cell signaling protein; and (2) formation of lipid microdomains or rafts that regulate the activity of a group of raft-associated cell signaling proteins. In recent years, a third mechanism has emerged, which invokes lipid second messengers as a regulator for the energy and redox balance of differentiating neural stem cells (NSCs). Interestingly, developmental niches such as the stem cell niche for adult NSC differentiation may also be metabolic compartments that respond to a distinct combination of bioactive lipids. The biological function of these lipids as regulators of NSC differentiation will be reviewed and their application in stem cell therapy discussed.
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Affiliation(s)
- Erhard Bieberich
- Institute of Molecular Medicine and Genetics, Georgia Health Sciences University, 1120 15th Street Room CA4012, Augusta, GA 30912, USA.
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23
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Frisca F, Sabbadini RA, Goldshmit Y, Pébay A. Biological Effects of Lysophosphatidic Acid in the Nervous System. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY VOLUME 296 2012; 296:273-322. [DOI: 10.1016/b978-0-12-394307-1.00005-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Abstract
Sphingosine-1-phosphate (S1P) and its receptors are important in nervous system development. Reliable in vitro human model systems are needed to further define specific roles for S1P signaling in neural development. We have recently reported that human embryonic stem cell-derived neuroepithelial progenitor cells (hES-NEP) express functional S1P receptors. These cells can be further differentiated to a neuronal cell type, and therefore represent a good model system to study the role of S1P signaling in human neural development. The following sections describe in detail the culture of hES-NEP cells and two assays to measure S1P signaling in these cells.
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Affiliation(s)
- Phillip Callihan
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, Athens, GA, USA
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25
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Callihan P, Zitomer NC, Stoeling MV, Kennedy PC, Lynch KR, Riley RT, Hooks SB. Distinct generation, pharmacology, and distribution of sphingosine 1-phosphate and dihydrosphingosine 1-phosphate in human neural progenitor cells. Neuropharmacology 2011; 62:988-96. [PMID: 22016110 DOI: 10.1016/j.neuropharm.2011.10.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2011] [Revised: 10/03/2011] [Accepted: 10/06/2011] [Indexed: 10/16/2022]
Abstract
In vivo and in vitro studies suggest a crucial role for Sphingosine 1-phosphate (S1P) and its receptors in the development of the nervous system. Dihydrosphingosine 1-phosphate (dhS1P), a reduced form of S1P, is an agonist at S1P receptors, but the pharmacology and physiology of dhS1P has not been widely studied. The mycotoxin fumonisin B1 (FB(1)) is a potent inhibitor of ceramide synthases and causes selective accumulation of dihydrosphingosine and dhS1P. Recent studies suggest that maternal exposure to FB(1) correlates with the development of neural tube defects (NTDs) in which the neural epithelial progenitor cell layers of the developing brain fail to fuse. We hypothesize that the altered balance of S1P and dhS1P in neural epithelial cells contributes to the developmental effects of FB(1). The goal of this work was first to define the effect of FB(1) exposure on levels of sphingosine and dh-sphingosine and their receptor-active 1-phosphate metabolites in human embryonic stem cell-derived neural epithelial progenitor (hES-NEP) cells; and second, to define the relative activity of dhS1P and S1P in hES-NEP cells. We found that dhS1P is a more potent stimulator of inhibition of cAMP and Smad phosphorylation than is S1P in neural progenitors, and this difference in apparent potency may be due, in part, to more persistent presence of extracellular dhS1P applied to human neural progenitors rather than a higher activity at S1P receptors. This study establishes hES-NEP cells as a useful human in vitro model system to study the mechanism of FB(1) toxicity and the molecular pharmacology of sphingolipid signaling. This article is part of a Special Issue entitled 'Post-Traumatic Stress Disorder'.
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Affiliation(s)
- Phillip Callihan
- Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, University of Georgia, 250 West Green Street, Athens, GA 30602-2352, USA
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26
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Blaho VA, Hla T. Regulation of mammalian physiology, development, and disease by the sphingosine 1-phosphate and lysophosphatidic acid receptors. Chem Rev 2011; 111:6299-320. [PMID: 21939239 PMCID: PMC3216694 DOI: 10.1021/cr200273u] [Citation(s) in RCA: 121] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Victoria A. Blaho
- Center for Vascular Biology, Department of Pathology and Laboratory Medicine, Weill Medical College of Cornell University, New York, NY 10065
| | - Timothy Hla
- Center for Vascular Biology, Department of Pathology and Laboratory Medicine, Weill Medical College of Cornell University, New York, NY 10065
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27
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Nonviral gene delivery in neural progenitors derived from human pluripotent stem cells. Methods Mol Biol 2011; 767:343-54. [PMID: 21822887 DOI: 10.1007/978-1-61779-201-4_25] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Human pluripotent stem cells (hPSCs) have been used to derive self-renewing neural progenitor (NP) cell lines. Here we describe methods to genetically modify these cells. Detailed methods for transfection and nucleofection in PSC-derived NP cells are presented. We have shown that nucleofection results in higher yield of GFP(+) NP cells as compared with transfection. However, nucleofection leads to higher cell death than transfection. Application of these methods allows for the development of novel tools to study human development and cellular differentiation. Genetically modified NPs have direct application in neural imaging, tracking neural cells, and for drug delivery to target organs using neural progenitor cells as carriers.
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Callihan P, Mumaw J, Machacek DW, Stice SL, Hooks SB. Regulation of stem cell pluripotency and differentiation by G protein coupled receptors. Pharmacol Ther 2010; 129:290-306. [PMID: 21073897 DOI: 10.1016/j.pharmthera.2010.10.007] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2010] [Accepted: 10/08/2010] [Indexed: 01/25/2023]
Abstract
Stem cell-based therapeutics have the potential to effectively treat many terminal and debilitating human diseases, but the mechanisms by which their growth and differentiation are regulated are incompletely defined. Recent data from multiple systems suggest major roles for G protein coupled receptor (GPCR) pathways in regulating stem cell function in vivo and in vitro. The goal of this review is to illustrate common ground between the growing field of stem cell therapeutics and the long-established field of G protein coupled receptor signaling. Herein, we briefly introduce basic stem cell biology and discuss how several conserved pathways regulate pluripotency and differentiation in mouse and human stem cells. We further discuss general mechanisms by which GPCR signaling may impact these pluripotency and differentiation pathways, and summarize specific examples of receptors from each of the major GPCR subfamilies that have been shown to regulate stem cell function. Finally, we discuss possible therapeutic implications of GPCR regulation of stem cell function.
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Affiliation(s)
- Phillip Callihan
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, Athens, GA, United States
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29
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Okae H, Iwakura Y. Neural tube defects and impaired neural progenitor cell proliferation in Gbeta1-deficient mice. Dev Dyn 2010; 239:1089-101. [PMID: 20186915 DOI: 10.1002/dvdy.22256] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Heterotrimeric G proteins are well known for their roles in signal transduction downstream of G protein-coupled receptors (GPCRs), and both Galpha subunits and tightly associated Gbetagamma subunits regulate downstream effector molecules. Compared to Galpha subunits, the physiological roles of individual Gbeta and Ggamma subunits are poorly understood. In this study, we generated mice deficient in the Gbeta1 gene and found that Gbeta1 is required for neural tube closure, neural progenitor cell proliferation, and neonatal development. About 40% Gbeta1(-/-) embryos developed neural tube defects (NTDs) and abnormal actin organization was observed in the basal side of neuroepithelium. In addition, Gbeta1(-/-) embryos without NTDs showed microencephaly and died within 2 days after birth. GPCR agonist-induced ERK phosphorylation, cell proliferation, and cell spreading, which were all found to be regulated by Galphai and Gbetagamma signaling, were abnormal in Gbeta1(-/-) neural progenitor cells. These data indicate that Gbeta1 is required for normal embryonic neurogenesis.
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Affiliation(s)
- Hiroaki Okae
- Center for Experimental Medicine and Systems Biology, Institute of Medical Science, University of Tokyo, Tokyo 108-8639, Japan
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30
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Müller R, Berliner C, Leptin J, Pörtner D, Bialecki W, Kleuser B, Schumacher U, Milićević NM. Expression of sphingosine-1-phosphate receptors and lysophosphatidic acid receptors on cultured and xenografted human colon, breast, melanoma, and lung tumor cells. Tumour Biol 2010; 31:341-9. [PMID: 20480410 DOI: 10.1007/s13277-010-0043-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2009] [Accepted: 04/21/2010] [Indexed: 12/25/2022] Open
Abstract
The lysophospholipids sphingosine-1-phosphate (S1P) and lysophosphatidic acid (LPA) are small lipid molecules with a variety of physiological roles. Additionally, their involvement in the initiation and progression of malignant tumors has been increasingly recognized in recent years. However, the data on the expression of S1P and LPA receptors on different cancer cells are very few. Real-time polymerase chain reaction was used for the analysis of mRNA expression of five S1P((1-5)) and three LPA((1-3)) receptors on a large panel of 13 colon, breast, melanoma, and lung cancer cell lines. Furthermore, the modulation of S1P and LPA receptor mRNA expression was studied upon xenotransplantation of tumor cells into severe combined immunodeficient (SCID) mice. The S1P and LPA receptors were expressed to a variable degree on all tumor cell lines tested (with exception of colon cancer SW480). Most notably, tumor cell lines in vitro expressed S1P(2) mRNA that was down-regulated upon xenotransplantation, whereas LPA(2) receptor mRNA was strongly expressed both in vitro and in vivo (except by breast cancer cells). The latter was especially distinctive for small cell lung tumor cells. The S1P and LPA receptors are differentially expressed on tumor cell lines in vitro. Their expression is modulated upon xenografting into SCID mice in vivo.
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Affiliation(s)
- Reinhard Müller
- Center for Experimental Medicine, Institute of Anatomy II: Experimental Morphology, University Hospital Hamburg-Eppendorf, Hamburg, Germany
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31
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Mumaw JL, Machacek D, Shields JP, Dodla MC, Dhara SK, Stice SL. Neural differentiation of human embryonic stem cells at the ultrastructural level. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2010; 16:80-90. [PMID: 20082731 DOI: 10.1017/s1431927609991279] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Neurodegerative disorders affect millions of people worldwide. Neural cells derived from human embryonic stem cells (hESC) have the potential for cell therapies and/or compound screening for treating affected individuals. While both protein and gene expression indicative of a neural phenotype has been exhibited in these differentiated cells, ultrastuctural studies thus far have been lacking. The objective of this study was to correlate hESC to neural differentiation culture conditions with ultrastructural changes observed in the treated cells. We demonstrate here that in basic culture conditions without growth factors or serum we obtain neural morphology. The addition of brain-derived neurotrophic factor (BDNF) and serum to cultures resulted in more robust neural differentiation. In addition to providing cues such as cell survival or lineage specification, additional factors also altered the intracellular structures and cell morphologies. Even though the addition of BDNF and serum did not increase synaptic formation, altered cellular structures such as abundant polyribosomes and more developed endoplasmic reticulum indicate a potential increase in protein production.
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Affiliation(s)
- Jennifer L Mumaw
- Regenerative Bioscience Center, Rhodes Center for Animal and Dairy Sciences, University of Georgia, 425 River Road, Room 427, Athens, GA 30602-2771, USA
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