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Sarabia-Sánchez MA, Moreno-Londoño AP, Castañeda-Patlán MC, Alvarado-Ortiz E, Martínez-Morales JC, Robles-Flores M. Non-canonical Wnt/Ca2+ signaling is essential to promote self-renewal and proliferation in colon cancer stem cells. Front Oncol 2023; 13:1121787. [PMID: 36969011 PMCID: PMC10036746 DOI: 10.3389/fonc.2023.1121787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 02/27/2023] [Indexed: 03/12/2023] Open
Abstract
IntroductionCancer Stem Cells (CSC) are responsible for maintaining tumor growth, chemoresistance, and metastasis. Therefore, understanding their characteristics is critical to progress in cancer therapy. While the contribution of the canonical Wnt/b-catenin signaling in both normal and CSCs had been well established, the function of non-canonical Wnt signaling cascades in stem cells is unclear. Recently, we reported that Wnt ligands trigger complex signaling in which the canonical and non-canonical responses can be simultaneously activated by one ligand in colon cancer cells, suggesting, therefore, that noncanonical Wnt pathways may also be important in CSCs.MethodsThe present work aimed to know the role of the Wnt/Ca2+ pathway in colon CSCs. We used tumorspheres as a model of CSCs enrichment of CRC cell lines with different Wnt/b-catenin contexts.ResultsUsing Wnt3a and Wnt5a as prototype ligands to activate the canonical or the non-canonical pathways, respectively, we found that both Wnt3a and Wnt5a promote sphere-formation capacity and proliferation without stimulating b-catenin-dependent transcription. Upregulation of sphere formation by Wnt5a or Wnt3a requires the downstream activation of Phospholipase C and transcriptional factor NFAT. Moreover, the single specific inhibition of PLC or NFAT, using U73122 and 11R-VIVIT, respectively, leads to impaired sphere formation.DiscussionOur results indicate that both types of ligands activate the Wnt/Ca2+ signaling axis to induce/maintain the self-renewal efficiency of CSCs, demonstrating to be essential for the functions of CSC in colon cancer.
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Montané-Romero ME, Martínez-Silva AV, Poot-Hernández AC, Escalante-Alcalde D. Plpp3, a novel regulator of pluripotency exit and endodermal differentiation of mouse embryonic stem cells. Biol Open 2023; 12:285908. [PMID: 36504260 PMCID: PMC9867895 DOI: 10.1242/bio.059665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 12/02/2022] [Indexed: 12/14/2022] Open
Abstract
In recent decades, study of the actions of bioactive lipids such as lysophosphatidic acid (LPA) and sphingosine-1-phosphate (S1P) has increased since they are involved in regulating many processes, including self-renewal of embryonic stem cells, embryo development and cancer. Phospholipid phosphatase type 3 (PLPP3) has been shown to be a key player in regulating the balance of these lipids and, in consequence, their signaling. Different lines of evidence suggest that PLPP3 could play a role in endoderm development. To approach this hypothesis, we used mouse embryonic stem cells (ESC) as a model to study Plpp3 function in self-renewal and the transition towards differentiation. We found that lack of PLPP3 mainly affects endoderm formation during differentiation of suspension-formed embryoid bodies. PLPP3-deficient ESC strongly decrease the amount of FOXA2-expressing cells and fail to properly downregulate the expression of pluripotency factors when subjected to an endoderm-directed differentiation protocol. Impaired endoderm differentiation correlated with a transient reduction in nuclear localization of YAP1. These phenotypes were rescued by transiently restoring the expression of catalytically active hPLPP3. In conclusion, PLPP3 plays a role in downregulating pluripotency-associated factors and in endodermal differentiation. PLPP3 regulates proper lipid/YAP1 signaling required for endodermal differentiation.
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Affiliation(s)
- Martha E. Montané-Romero
- Instituto de Fisiología Celular, División de Neurociencias, Universidad Nacional Autónoma de México, Ciudad de México C.P. 04510, México
| | - Ana V. Martínez-Silva
- Instituto de Fisiología Celular, División de Neurociencias, Universidad Nacional Autónoma de México, Ciudad de México C.P. 04510, México
| | - Augusto C. Poot-Hernández
- Unidad de Bioinformática y Manejo de la Información, Universidad Nacional Autónoma de México, Ciudad de México C.P. 04510, México
| | - Diana Escalante-Alcalde
- Instituto de Fisiología Celular, División de Neurociencias, Universidad Nacional Autónoma de México, Ciudad de México C.P. 04510, México,Author for correspondence ()
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Wang Y, Zhang J, Huang L, Mo Y, Wang C, Li Y, Zhang Y, Zhang Z. The LPA-CDK5-tau pathway mediates neuronal injury in an in vitro model of ischemia-reperfusion insult. BMC Neurol 2022; 22:166. [PMID: 35501719 PMCID: PMC9059403 DOI: 10.1186/s12883-022-02694-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2021] [Accepted: 04/29/2022] [Indexed: 11/23/2022] Open
Abstract
Lysophosphatidic acid (LPA) is a common glycerol phospholipid and an important extracellular signaling molecule. LPA binds to its receptors and mediates a variety of biological effects, including the pathophysiological process underlying ischemic brain damage and traumatic brain injury. However, the molecular mechanisms mediating the pathological role of LPA are not clear. Here, we found that LPA activates cyclin-dependent kinase 5 (CDK5). CDK5 phosphorylates tau, which leads to neuronal cell death. Inhibition of LPA production or blocking its receptors reduced the abnormal activation of CDK5 and phosphorylation of tau, thus reversing the death of neurons. Our data indicate that the LPA-CDK5-Tau pathway plays an important role in the pathophysiological process after ischemic stroke. Inhibiting the LPA pathway may be a potential therapeutic target for treating ischemic brain injury.
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Affiliation(s)
- Yaya Wang
- Department of Neurology, Renmin hospital of Wuhan University, Wuhan, 430060, China
| | - Jie Zhang
- Department of Neurology, Renmin hospital of Wuhan University, Wuhan, 430060, China
| | - Liqin Huang
- Department of Neurology, Renmin hospital of Wuhan University, Wuhan, 430060, China
| | - Yanhong Mo
- Department of Neurology, Renmin hospital of Wuhan University, Wuhan, 430060, China
| | - Changyu Wang
- Department of Neurology, Renmin hospital of Wuhan University, Wuhan, 430060, China
| | - Yiyi Li
- Department of Neurology, Renmin hospital of Wuhan University, Wuhan, 430060, China
| | - Yangyang Zhang
- Department of Neurology, Renmin hospital of Wuhan University, Wuhan, 430060, China
| | - Zhaohui Zhang
- Department of Neurology, Renmin hospital of Wuhan University, Wuhan, 430060, China.
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4
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Liang Z, He P, Han Y, Yun CC. Survival of Stem Cells and Progenitors in the Intestine Is Regulated by LPA 5-Dependent Signaling. Cell Mol Gastroenterol Hepatol 2022; 14:129-150. [PMID: 35390517 PMCID: PMC9120264 DOI: 10.1016/j.jcmgh.2022.03.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 03/28/2022] [Accepted: 03/29/2022] [Indexed: 02/06/2023]
Abstract
BACKGROUND & AIMS Regeneration of the epithelium by stem cells in the intestine is supported by intrinsic and extrinsic factors. Lysophosphatidic acid (LPA), a bioactive lipid mediator, regulates many cellular functions, including cell proliferation, survival, and cytokine secretion. Here, we identify LPA5 receptor as a potent regulator of the survival of stem cells and transit-amplifying cells in the intestine. METHODS We have used genetic mouse models of conditional deletion of Lpar5, Lpar5f/f;Rosa-CreERT (Lpar5KO), and intestinal epithelial cell-specific Lpar5f/f;AhCre (Lpar5IECKO) mice. Mice were treated with tamoxifen or β-naphthoflavone to delete Lpar5 expression. Enteroids derived from these mice were used to determine the effect of Lpar5 loss on the apoptosis and proliferation of crypt epithelial cells. RESULTS Conditional loss of Lpar5 induced ablation of the intestinal mucosa, which increased morbidity of Lpar5KO mice. Epithelial regeneration was compromised with increased apoptosis and decreased proliferation of crypt epithelial cells by Lpar5 loss. Interestingly, intestinal epithelial cell-specific Lpar5 loss did not cause similar phenotypic defects in vivo. Lpar5 loss reduced intestinal stem cell marker gene expression and reduced lineage tracing from Lgr5+ ISCs. Lpar5 loss induced CXCL10 expression which exerts cytotoxic effects on intestinal stem cells and progenitors in the intestinal crypts. By co-culturing Lpar5KO enteroids with wild-type or Lpar5KO splenocytes, we demonstrated that lymphocytes protect the intestinal crypts via a LPA5-dependent suppression of CXCL10. CONCLUSIONS LPA5 is essential for the regeneration of intestinal epithelium. Our findings reveal a new finding that LPA5 regulates survival of stem cells and transit-amplifying cells in the intestine.
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Affiliation(s)
- Zhongxing Liang
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Peijian He
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Yiran Han
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - C. Chris Yun
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia,Gastroenterology Research, Atlanta Veterans Administration Medical Center, Decatur, Georgia,Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia,Correspondence Address correspondence to: Chris Yun, PhD, Division of Digestive Diseases, Emory University School of Medicine, Atlanta, GA 30324. fax: (404) 727-5767.
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5
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Hirata N, Yamada S, Yanagida S, Ono A, Yasuhiko Y, Nishida M, Kanda Y. Lysophosphatidic Acid Promotes the Expansion of Cancer Stem Cells via TRPC3 Channels in Triple-Negative Breast Cancer. Int J Mol Sci 2022; 23:ijms23041967. [PMID: 35216080 PMCID: PMC8877950 DOI: 10.3390/ijms23041967] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 02/07/2022] [Accepted: 02/08/2022] [Indexed: 01/27/2023] Open
Abstract
Triple-negative breast cancer (TNBC) is a highly aggressive cancer for which targeted therapeutic agents are limited. Growing evidence suggests that TNBC originates from breast cancer stem cells (BCSCs), and elucidation of the molecular mechanisms controlling BCSC proliferation will be crucial for new drug development. We have previously reported that the lysosphingolipid sphingosine-1-phosphate mediates the CSC phenotype, which can be identified as the ALDH-positive cell population in several types of human cancer cell lines. In this study, we have investigated additional lipid receptors upregulated in BCSCs. We found that lysophosphatidic acid (LPA) receptor 3 was highly expressed in ALDH-positive TNBC cells. The LPAR3 antagonist inhibited the increase in ALDH-positive cells after LPA treatment. Mechanistically, the LPA-induced increase in ALDH-positive cells was dependent on intracellular calcium ion (Ca2+), and the increase in Ca2+ was suppressed by a selective inhibitor of transient receptor potential cation channel subfamily C member 3 (TRPC3). Moreover, IL-8 production was involved in the LPA response via the activation of the Ca2+-dependent transcriptional factor nuclear factor of activated T cells. Taken together, our findings provide new insights into the lipid-mediated regulation of BCSCs via the LPA-TRPC3 signaling axis and suggest several potential therapeutic targets for TNBC.
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Affiliation(s)
- Naoya Hirata
- Division of Pharmacology, National Institute of Health Sciences, Kanagawa 210-9501, Japan; (N.H.); (S.Y.); (S.Y.); (Y.Y.)
- Pharmacological Evaluation Institute of Japan (PEIJ), Ibaraki 305-0031, Japan
| | - Shigeru Yamada
- Division of Pharmacology, National Institute of Health Sciences, Kanagawa 210-9501, Japan; (N.H.); (S.Y.); (S.Y.); (Y.Y.)
- Pharmacological Evaluation Institute of Japan (PEIJ), Ibaraki 305-0031, Japan
| | - Shota Yanagida
- Division of Pharmacology, National Institute of Health Sciences, Kanagawa 210-9501, Japan; (N.H.); (S.Y.); (S.Y.); (Y.Y.)
- Division of Pharmaceutical Sciences, Graduated School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama 700-8530, Japan;
| | - Atsushi Ono
- Division of Pharmaceutical Sciences, Graduated School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama 700-8530, Japan;
| | - Yukuto Yasuhiko
- Division of Pharmacology, National Institute of Health Sciences, Kanagawa 210-9501, Japan; (N.H.); (S.Y.); (S.Y.); (Y.Y.)
| | - Motohiro Nishida
- Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan;
- Exploratory Research Center on Life and Living Systems, National Institutes of Natural Sciences, Aichi 444-8787, Japan
- National Institute for Physiological Sciences, National Institutes of Natural Sciences, Aichi 444-8787, Japan
| | - Yasunari Kanda
- Division of Pharmacology, National Institute of Health Sciences, Kanagawa 210-9501, Japan; (N.H.); (S.Y.); (S.Y.); (Y.Y.)
- Correspondence:
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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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7
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Lysophosphatidic acid (LPA) as a modulator of plasma membrane Ca 2+-ATPase from basolateral membranes of kidney proximal tubules. J Physiol Biochem 2021; 77:321-329. [PMID: 33704695 DOI: 10.1007/s13105-021-00800-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 02/15/2021] [Indexed: 01/10/2023]
Abstract
Lysophosphatidic acid (LPA) acts through the activation of G protein-coupled receptors, in a Ca2+-dependent manner. We show the effects of LPA on the plasma membrane Ca2+-ATPase (PMCA) from kidney proximal tubule cells. The Ca2+-ATPase activity was inhibited by nanomolar concentrations of LPA, with maximal inhibition (~50%) obtained with 20 nM LPA. This inhibitory action on PMCA activity was blocked by Ki16425, an antagonist for LPA receptors, indicating that this lipid acts via LPA1 and/or LPA3 receptor. This effect is PKC-dependent, since it is abolished by calphostin C and U73122, PKC, and PLC inhibitors, respectively. Furthermore, the addition of 10-8 M PMA, a well-known PKC activator, mimicked PMCA modulation by LPA. We also demonstrated that the PKC activation leads to an increase in PMCA phosphorylation. These results indicate that LPA triggers LPA1 and/or LPA3 receptors at the BLM, inducing PKC-dependent phosphorylation with further inhibition of PMCA. Thus, LPA is part of the regulatory lipid network present at the BLM and plays an important role in the regulation of intracellular Ca2+ concentration that may result in significant physiological alterations in other Ca2+-dependent events ascribed to the renal tissue.
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8
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Hu HB, Song ZQ, Song GP, Li S, Tu HQ, Wu M, Zhang YC, Yuan JF, Li TT, Li PY, Xu YL, Shen XL, Han QY, Li AL, Zhou T, Chun J, Zhang XM, Li HY. LPA signaling acts as a cell-extrinsic mechanism to initiate cilia disassembly and promote neurogenesis. Nat Commun 2021; 12:662. [PMID: 33510165 PMCID: PMC7843646 DOI: 10.1038/s41467-021-20986-y] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 12/15/2020] [Indexed: 01/17/2023] Open
Abstract
Dynamic assembly and disassembly of primary cilia controls embryonic development and tissue homeostasis. Dysregulation of ciliogenesis causes human developmental diseases termed ciliopathies. Cell-intrinsic regulatory mechanisms of cilia disassembly have been well-studied. The extracellular cues controlling cilia disassembly remain elusive, however. Here, we show that lysophosphatidic acid (LPA), a multifunctional bioactive phospholipid, acts as a physiological extracellular factor to initiate cilia disassembly and promote neurogenesis. Through systematic analysis of serum components, we identify a small molecular-LPA as the major driver of cilia disassembly. Genetic inactivation and pharmacological inhibition of LPA receptor 1 (LPAR1) abrogate cilia disassembly triggered by serum. The LPA-LPAR-G-protein pathway promotes the transcription and phosphorylation of cilia disassembly factors-Aurora A, through activating the transcription coactivators YAP/TAZ and calcium/CaM pathway, respectively. Deletion of Lpar1 in mice causes abnormally elongated cilia and decreased proliferation in neural progenitor cells, thereby resulting in defective neurogenesis. Collectively, our findings establish LPA as a physiological initiator of cilia disassembly and suggest targeting the metabolism of LPA and the LPA pathway as potential therapies for diseases with dysfunctional ciliogenesis.
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Affiliation(s)
- Huai-Bin Hu
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Zeng-Qing Song
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Guang-Ping Song
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Sen Li
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Hai-Qing Tu
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Min Wu
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Yu-Cheng Zhang
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Jin-Feng Yuan
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Ting-Ting Li
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Pei-Yao Li
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Yu-Ling Xu
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Xiao-Lin Shen
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Qiu-Ying Han
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Ai-Ling Li
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Tao Zhou
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China
| | - Jerold Chun
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, USA
| | - Xue-Min Zhang
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China.
| | - Hui-Yan Li
- State Key Laboratory of Proteomics, National Center of Biomedical Analysis, Beijing, China.
- School of Basic Medical Sciences, Fudan University, Shanghai, China.
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Lin KH, Chiang JC, Ho YH, Yao CL, Lee H. Lysophosphatidic Acid and Hematopoiesis: From Microenvironmental Effects to Intracellular Signaling. Int J Mol Sci 2020; 21:ijms21062015. [PMID: 32188052 PMCID: PMC7139687 DOI: 10.3390/ijms21062015] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 03/13/2020] [Accepted: 03/13/2020] [Indexed: 02/06/2023] Open
Abstract
Vertebrate hematopoiesis is a complex physiological process that is tightly regulated by intracellular signaling and extracellular microenvironment. In recent decades, breakthroughs in lineage-tracing technologies and lipidomics have revealed the existence of numerous lipid molecules in hematopoietic microenvironment. Lysophosphatidic acid (LPA), a bioactive phospholipid molecule, is one of the identified lipids that participates in hematopoiesis. LPA exhibits various physiological functions through activation of G-protein-coupled receptors. The functions of these LPARs have been widely studied in stem cells, while the roles of LPARs in hematopoietic stem cells have rarely been examined. Nonetheless, mounting evidence supports the importance of the LPA-LPAR axis in hematopoiesis. In this article, we have reviewed regulation of hematopoiesis in general and focused on the microenvironmental and intracellular effects of the LPA in hematopoiesis. Discoveries in these areas may be beneficial to our understanding of blood-related disorders, especially in the context of prevention and therapy for anemia.
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Affiliation(s)
- Kuan-Hung Lin
- Department of Life Science, National Taiwan University, Taipei 10617, Taiwan; (K.-H.L.); (J.-C.C.)
| | - Jui-Chung Chiang
- Department of Life Science, National Taiwan University, Taipei 10617, Taiwan; (K.-H.L.); (J.-C.C.)
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Ya-Hsuan Ho
- Wellcome Trust-Medical Research Council Cambridge Stem Cell Institute and Department of Haematology, University of Cambridge, Cambridge CB2 0AW, UK;
| | - Chao-Ling Yao
- Department of Chemical Engineering and Materials Science, Yuan Ze University, Taoyuan 32003, Taiwan;
| | - Hsinyu Lee
- Department of Life Science, National Taiwan University, Taipei 10617, Taiwan; (K.-H.L.); (J.-C.C.)
- Department of Electrical Engineering, National Taiwan University, Taipei 10617, Taiwan
- Angiogenesis Research Center, National Taiwan University, Taipei 10617, Taiwan
- Research Center for Developmental Biology and Regenerative Medicine, National Taiwan University, Taipei 10617, Taiwan
- Center for Biotechnology, National Taiwan University, Taipei 10617, Taiwan
- Correspondence: ; Tel.: +8862-3366-2499; Fax: +8862-2363-6837
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Fissore RA, Burton A, Lykke-Hartmann K. Editorial: Molecular and Cellular Mechanisms in Reproduction and Early Development. Front Cell Dev Biol 2019; 7:36. [PMID: 30949478 PMCID: PMC6435482 DOI: 10.3389/fcell.2019.00036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Accepted: 02/27/2019] [Indexed: 11/13/2022] Open
Affiliation(s)
- Rafael A Fissore
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, United States
| | - Adam Burton
- Institute of Epigenetics and Stem Cells, Helmholtz Zentrum München, München, Germany
| | - Karin Lykke-Hartmann
- Department of Biomedicine, C Aarhus University, Aarhus, Denmark.,Department of Clinical Medicine, Aarhus University, Aarhus, Denmark.,Department of Clinical Genetics, Aarhus University Hospital, Aarhus, Denmark
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11
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Poteet E, Liu D, Liang Z, Van Buren G, Chen C, Yao Q. Mesothelin and TGF-α predict pancreatic cancer cell sensitivity to EGFR inhibitors and effective combination treatment with trametinib. PLoS One 2019; 14:e0213294. [PMID: 30921351 PMCID: PMC6438513 DOI: 10.1371/journal.pone.0213294] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Accepted: 02/18/2019] [Indexed: 01/12/2023] Open
Abstract
Clinical trials of EGFR inhibitors in combination with gemcitabine for the treatment of pancreatic ductal adenocarcinoma (PDAC) have generated mixed results partially due to the poorly defined effectiveness of EGFR inhibitors in PDAC. Here, we studied a panel of PDAC cell lines to compare the IC50s of the EGFR inhibitors gefitinib and cetuximab. We found that gefitinib induced biphasic inhibition in over 50% of PDAC cells, with the initial growth inhibition occurring at nanomolar concentrations and a second growth inhibition occurring outside the clinical range. In contrast to gefitinib, cetuximab produced a single phase growth inhibition in a subset of PDAC cells. Using this sensitivity data, we screened for correlations between cell morphology proteins and EGFR ligands to EGFR inhibitor sensitivity, and found that mesothelin and the EGFR ligand TGF-α have a strong correlation to gefitinib and cetuximab sensitivity. Analysis of downstream signaling pathways indicated that plc-γ1 and c-myc were consistently inhibited by EGFR inhibitor treatment in sensitive cell lines. While an inconsistent additive effect was observed with either cetuximab or gefitinib in combination with gemcitabine, the cell pathway data indicated consistent ERK activation, leading us to pursue EGFR inhibitors in combination with trametinib, a MEK1/2 inhibitor. Both cetuximab and gefitinib in combination with trametinib produced an additive effect in all EGFR sensitive cell lines. Our results indicate that mesothelin and TGF-α can predict PDAC sensitivity to EGFR inhibitors and a combination of EGFR inhibitors with trametinib could be a novel effective treatment for PDAC.
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Affiliation(s)
- Ethan Poteet
- Michael E. DeBakey Department of Surgery, Division of Surgical Research, Baylor College of Medicine, Houston, Texas, United States of America
| | - Dongliang Liu
- Michael E. DeBakey Department of Surgery, Division of Surgical Research, Baylor College of Medicine, Houston, Texas, United States of America
| | - Zhengdong Liang
- Michael E. DeBakey Department of Surgery, Division of Surgical Research, Baylor College of Medicine, Houston, Texas, United States of America
| | - George Van Buren
- Michael E. DeBakey Department of Surgery, Division of Surgical Research, Baylor College of Medicine, Houston, Texas, United States of America
| | - Changyi Chen
- Michael E. DeBakey Department of Surgery, Division of Surgical Research, Baylor College of Medicine, Houston, Texas, United States of America
| | - Qizhi Yao
- Michael E. DeBakey Department of Surgery, Division of Surgical Research, Baylor College of Medicine, Houston, Texas, United States of America
- Center for Translational Research on Inflammatory Diseases (CTRID), Michael E. DeBakey VA Medical Center, Houston, Texas, United States of America
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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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13
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Ermakov A, Daks A, Fedorova O, Shuvalov O, Barlev NA. Ca 2+ -depended signaling pathways regulate self-renewal and pluripotency of stem cells. Cell Biol Int 2018; 42:1086-1096. [PMID: 29851182 DOI: 10.1002/cbin.10998] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2017] [Accepted: 05/25/2018] [Indexed: 12/15/2022]
Abstract
Ca2+ -mediated signaling is widely spread in nature and plays critical role in the individual development of various organisms ranging from microorganisms to mammals. In vertebrates, Ca2+ is involved in important developmental events: fertilization, body plan establishment, and organogenesis. The two later events are defined by embryonic stem cells (ESCs). ESCs are capable of self-renewal and are pluripotent by nature, that is, can give rise to all types of cells that make up the body. Given the paramount importance of Ca2+ signalization in the development, it is therefore not surprising this process also plays role in the biology of stem cells. In this review, we scrutinize the published experimental data on the role of Ca2+ ions in embryonic stem cells self-renewal and pluripotency. In line with this, we also discuss possible mechanisms of p53 inhibition as a major hindrance to self-renewal of ESCs. Finally, we argue about the role of G-protein-coupled receptors (GPCRs), the largest family of heteromeric transmembrane receptors, and GPCR-mediated signalization in stem cells, and propose the role for the GPCR-G-protein-PLC-Ca2+ -downstream signaling pathway in the regulation of pluripotency of both mouse and human ESCs.
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Affiliation(s)
| | - Alexandra Daks
- Institute of Cytology RAS, Saint-Petersburg 194064, Russia
| | - Olga Fedorova
- Institute of Cytology RAS, Saint-Petersburg 194064, Russia
| | - Oleg Shuvalov
- Institute of Cytology RAS, Saint-Petersburg 194064, Russia
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14
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Chen M, Laursen SH, Habekost M, Knudsen CH, Buchholdt SH, Huang J, Xu F, Liu X, Bolund L, Luo Y, Nissen P, Febbraro F, Denham M. Central and Peripheral Nervous System Progenitors Derived from Human Pluripotent Stem Cells Reveal a Unique Temporal and Cell-Type Specific Expression of PMCAs. Front Cell Dev Biol 2018; 6:5. [PMID: 29468158 PMCID: PMC5808168 DOI: 10.3389/fcell.2018.00005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 01/19/2018] [Indexed: 01/23/2023] Open
Abstract
The P-type ATPases family consists of ion and lipid transporters. Their unique diversity in function and expression is critical for normal development. In this study we investigated human pluripotent stem cells (hPSC) and different neural progenitor states to characterize the expression of the plasma membrane calcium ATPases (PMCAs) during human neural development and in mature mesencephalic dopaminergic (mesDA) neurons. Our RNA sequencing data identified a dynamic change in ATPase expression correlating with the differentiation time of the neural progenitors, which was independent of the neuronal progenitor type. Expression of ATP2B1 and ATP2B4 were the most abundantly expressed, in accordance with their main role in Ca2+ regulation and we observed all of the PMCAs to have a subcellular punctate localization. Interestingly in hPSCs ATP2B1 and ATP2B3 were highly expressed in a cell cycle specific manner and ATP2B2 and ATP2B4 were highly expressed in a hPSC sub-population. In neural rosettes a strong apical PMCA expression was identified in the luminal region. Lastly, we confirmed all PMCAs to be expressed in mesDA neurons, however at varying levels. Our results reveal that PMCA expression dynamically changes during stem cell differentiation and highlights the diverging needs of cell populations to regulate and properly integrate Ca2+ changes, which can ultimately correspond to changes in specific stem cell transcription states.
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Affiliation(s)
- Muwan Chen
- Danish Research Institute of Translational Neuroscience, Nordic EMBL Partnership for Molecular Medicine, Aarhus University, Aarhus, Denmark.,Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Sofie H Laursen
- Danish Research Institute of Translational Neuroscience, Nordic EMBL Partnership for Molecular Medicine, Aarhus University, Aarhus, Denmark.,Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Mette Habekost
- Danish Research Institute of Translational Neuroscience, Nordic EMBL Partnership for Molecular Medicine, Aarhus University, Aarhus, Denmark.,Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Camilla H Knudsen
- Danish Research Institute of Translational Neuroscience, Nordic EMBL Partnership for Molecular Medicine, Aarhus University, Aarhus, Denmark.,Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Susanne H Buchholdt
- Danish Research Institute of Translational Neuroscience, Nordic EMBL Partnership for Molecular Medicine, Aarhus University, Aarhus, Denmark.,Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Jinrong Huang
- Beijing Genomics Institute, Shenzhen, China.,Lars Bolund Institute of Regenerative Medicine, Beijing Genomics Institute-Qingdao, Qingdao, China
| | - Fengping Xu
- Beijing Genomics Institute, Shenzhen, China.,Lars Bolund Institute of Regenerative Medicine, Beijing Genomics Institute-Qingdao, Qingdao, China.,China National GeneBank, Beijing Genomics Institute, Shenzhen, China.,Laboratory of Genomics and Molecular Biomedicine, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Xin Liu
- Beijing Genomics Institute, Shenzhen, China.,China National GeneBank, Beijing Genomics Institute, Shenzhen, China
| | - Lars Bolund
- Department of Biomedicine, Aarhus University, Aarhus, Denmark.,Beijing Genomics Institute, Shenzhen, China.,Lars Bolund Institute of Regenerative Medicine, Beijing Genomics Institute-Qingdao, Qingdao, China.,China National GeneBank, Beijing Genomics Institute, Shenzhen, China
| | - Yonglun Luo
- Department of Biomedicine, Aarhus University, Aarhus, Denmark.,Beijing Genomics Institute, Shenzhen, China.,Lars Bolund Institute of Regenerative Medicine, Beijing Genomics Institute-Qingdao, Qingdao, China.,China National GeneBank, Beijing Genomics Institute, Shenzhen, China
| | - Poul Nissen
- Danish Research Institute of Translational Neuroscience, Nordic EMBL Partnership for Molecular Medicine, Aarhus University, Aarhus, Denmark.,Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - Fabia Febbraro
- Danish Research Institute of Translational Neuroscience, Nordic EMBL Partnership for Molecular Medicine, Aarhus University, Aarhus, Denmark.,Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
| | - Mark Denham
- Danish Research Institute of Translational Neuroscience, Nordic EMBL Partnership for Molecular Medicine, Aarhus University, Aarhus, Denmark.,Department of Biomedicine, Aarhus University, Aarhus, Denmark
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15
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Autotaxin-mediated lipid signaling intersects with LIF and BMP signaling to promote the naive pluripotency transcription factor program. Proc Natl Acad Sci U S A 2016; 113:12478-12483. [PMID: 27738243 DOI: 10.1073/pnas.1608564113] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Developmental signaling molecules are used for cell fate determination, and understanding how their combinatorial effects produce the variety of cell types in multicellular organisms is a key problem in biology. Here, we demonstrate that the combination of leukemia inhibitory factor (LIF), bone morphogenetic protein 4 (BMP4), lysophosphatidic acid (LPA), and ascorbic acid (AA) efficiently converts mouse primed pluripotent stem cells (PSCs) into naive PSCs. Signaling by the lipid LPA through its receptor LPAR1 and downstream effector Rho-associated protein kinase (ROCK) cooperated with LIF signaling to promote this conversion. BMP4, which also stimulates conversion to naive pluripotency, bypassed the need for exogenous LPA by increasing the activity of the extracellular LPA-producing enzyme autotaxin (ATX). We found that LIF and LPA-LPAR1 signaling affect the abundance of signal transducer and activator of transcription 3 (STAT3), which induces a previously unappreciated Kruppel-like factor (KLF)2-KLF4-PR domain 14 (PRDM14) transcription factor circuit key to establish naive pluripotency. AA also affects this transcription factor circuit by controlling PRDM14 expression. Thus, our study reveals that ATX-mediated autocrine lipid signaling promotes naive pluripotency by intersecting with LIF and BMP4 signaling.
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16
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Zhang D, Mai Q, Li T, Huang J, Ding C, Jia M, Zhou C, Xu Y. Comparison of a xeno-free and serum-free culture system for human embryonic stem cells with conventional culture systems. Stem Cell Res Ther 2016; 7:101. [PMID: 27474011 PMCID: PMC4967296 DOI: 10.1186/s13287-016-0347-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2016] [Revised: 05/14/2016] [Accepted: 06/10/2016] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND Elimination of all animal components during derivation and long-term culture of human embryonic stem cells (hESCs) is necessary for future applications of hESCs in clinical cell therapy. METHODS In this study, we established the culture system of xeno-free human foreskin fibroblast feeders (XF-HFF) in combination with chemically defined medium (CDM). XF-HFF/CDM was compared with several conventional culture systems. The hESCs cultured in different media were further characterized through karyotype analysis, pluripotency gene expression, and cell differentiation ability. RESULTS The hESCs in the XF-HFF/CDM maintained their characteristics including typical morphology and stable karyotype. In addition, hESCs were characterized by fluorescent immunostaining of pluripotent markers and teratoma formation in vivo. RT-PCR analysis shown that the stem cell markers OCT3/4, hTERT, SOX2, and Nanog were present in the cell line hESC-1 grown on XF-HFF/CDM. Furthermore, the results of cell growth and expression of bFGF, Oct-4, and hTERT indicated that XF-HFF/CDM had better performance than human serum-matrix/CDM and XF-HFF/human serum. CONCLUSION The comparison of different xeno-free culture conditions will facilitate clarifying the key features of self-renewal, pluripotency, and derivation and will shed light on clinic applications of hESCs.
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Affiliation(s)
- Dan Zhang
- Reproductive Medicine Center, the First Affiliated Hospital of Sun Yat-sen University, 58 Zhongshan Road II, Guangzhou, Guangdong, 510080, People's Republic of China
| | - Qingyun Mai
- Reproductive Medicine Center, the First Affiliated Hospital of Sun Yat-sen University, 58 Zhongshan Road II, Guangzhou, Guangdong, 510080, People's Republic of China
| | - Tao Li
- Reproductive Medicine Center, the First Affiliated Hospital of Sun Yat-sen University, 58 Zhongshan Road II, Guangzhou, Guangdong, 510080, People's Republic of China
| | - Jia Huang
- Reproductive Medicine Center, the First Affiliated Hospital of Sun Yat-sen University, 58 Zhongshan Road II, Guangzhou, Guangdong, 510080, People's Republic of China
| | - Chenhui Ding
- Reproductive Medicine Center, the First Affiliated Hospital of Sun Yat-sen University, 58 Zhongshan Road II, Guangzhou, Guangdong, 510080, People's Republic of China
| | - Mengxi Jia
- Reproductive Medicine Center, the First Affiliated Hospital of Sun Yat-sen University, 58 Zhongshan Road II, Guangzhou, Guangdong, 510080, People's Republic of China
| | - Canquan Zhou
- Reproductive Medicine Center, the First Affiliated Hospital of Sun Yat-sen University, 58 Zhongshan Road II, Guangzhou, Guangdong, 510080, People's Republic of China.
| | - Yanwen Xu
- Reproductive Medicine Center, the First Affiliated Hospital of Sun Yat-sen University, 58 Zhongshan Road II, Guangzhou, Guangdong, 510080, People's Republic of China.
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17
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Lo IC, Chan HC, Qi Z, Ng KL, So C, Tsang SY. TRPV3 Channel Negatively Regulates Cell Cycle Progression and Safeguards the Pluripotency of Embryonic Stem Cells. J Cell Physiol 2016; 231:403-13. [PMID: 26130157 DOI: 10.1002/jcp.25086] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Accepted: 06/23/2015] [Indexed: 01/27/2023]
Abstract
Embryonic stem cells (ESCs) have tremendous potential for research and future therapeutic purposes. However, the calcium handling mechanism in ESCs is not fully elucidated. Aims of this study are (1) to investigate if transient receptor potential vanilloid-3 (TRPV3) channels are present in mouse ESCs (mESCs) and their subcellular localization; (2) to investigate the role of TRPV3 in maintaining the characteristics of mESCs. Western blot and immunocytochemistry showed that TRPV3 was present at the endoplasmic reticulum (ER) of mESCs. Calcium imaging showed that, in the absence of extracellular calcium, TRPV3 activators camphor and 6-tert-butyl-m-cresol increased the cytosolic calcium. However, depleting the ER store in advance of activator addition abolished the calcium increase, suggesting that TRPV3 released calcium from the ER. To dissect the functional role of TRPV3, TRPV3 was activated and mESC proliferation was measured by trypan blue exclusion and MTT assays. The results showed that TRPV3 activation led to a decrease in mESC proliferation. Cell cycle analysis revealed that TRPV3 activation increased the percentage of cells in G2 /M phase; consistently, Western blot also revealed a concomitant increase in the expression of inactive form of cyclin-dependent kinase 1, suggesting that TRPV3 activation arrested mESCs at G2 /M phase. TRPV3 activation did not alter the expression of pluripotency markers Oct-4, Klf4 and c-Myc, suggesting that the pluripotency was preserved. Our study is the first study to show the presence of TRPV3 at ER. Our study also reveals the novel role of TRPV3 in controlling the cell cycle and preserving the pluripotency of ESCs.
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Affiliation(s)
- Iek Chi Lo
- School of Life Sciences, The Chinese University of Hong Kong, Hong Kong SAR
| | - Hing Chung Chan
- School of Life Sciences, The Chinese University of Hong Kong, Hong Kong SAR
| | - Zenghua Qi
- School of Life Sciences, The Chinese University of Hong Kong, Hong Kong SAR
| | - Kwun Lam Ng
- School of Life Sciences, The Chinese University of Hong Kong, Hong Kong SAR
| | - Chun So
- School of Life Sciences, The Chinese University of Hong Kong, Hong Kong SAR
| | - Suk Ying Tsang
- School of Life Sciences, The Chinese University of Hong Kong, Hong Kong SAR.,Key Laboratory for Regenerative Medicine, Ministry of Education, The Chinese University of Hong Kong, Hong Kong SAR.,State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Hong Kong SAR.,Centre of Novel Biomaterials, The Chinese University of Hong Kong, Hong Kong SAR
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18
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Hao B, Webb SE, Miller AL, Yue J. The role of Ca(2+) signaling on the self-renewal and neural differentiation of embryonic stem cells (ESCs). Cell Calcium 2016; 59:67-74. [PMID: 26973143 DOI: 10.1016/j.ceca.2016.01.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Revised: 01/05/2016] [Accepted: 01/19/2016] [Indexed: 12/12/2022]
Abstract
Embryonic stem cells (ESCs) are promising resources for both scientific research and clinical regenerative medicine. With regards to the latter, ESCs are especially useful for treating several neurodegenerative disorders. Two significant characteristics of ESCs, which make them so valuable, are their capacity for self-renewal and their pluripotency, both of which are regulated by the integration of various signaling pathways. Intracellular Ca(2+) signaling is involved in several of these pathways. It is known to be precisely controlled by different Ca(2+) channels and pumps, which play an important role in a variety of cellular activities, including proliferation, differentiation and apoptosis. Here, we provide a review of the recent work conducted to investigate the function of Ca(2+) signaling in the self-renewal and the neural differentiation of ESCs. Specifically, we describe the role of intracellular Ca(2+) mobilization mediated by RyRs (ryanodine receptors); by cADPR (cyclic adenosine 5'-diphosphate ribose) and CD38 (cluster of differentiation 38/cADPR hydrolase); and by NAADP (nicotinic acid adenine dinucleotide phosphate) and TPC2 (two pore channel 2). We also discuss the Ca(2+) influx mediated by SOCs (store-operated Ca(2+) channels), TRPCs (transient receptor potential cation channels) and LTCC (L-type Ca(2+) channels) in the pluripotent ESCs as well as in neural differentiation of ESCs. Moreover, we describe the integration of Ca(2+) signaling in the other signaling pathways that are known to regulate the fate of ESCs.
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Affiliation(s)
- Baixia Hao
- Division of Life Science and State Key Laboratory of Molecular Neuroscience, HKUST, Clear Water Bay, Hong Kong, China
| | - Sarah E Webb
- Division of Life Science and State Key Laboratory of Molecular Neuroscience, HKUST, Clear Water Bay, Hong Kong, China
| | - Andrew L Miller
- Division of Life Science and State Key Laboratory of Molecular Neuroscience, HKUST, Clear Water Bay, Hong Kong, China
| | - Jianbo Yue
- Department of Biomedical Sciences, City University of Hong Kong, Kowloon Tong, Hong Kong, China.
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19
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Ryu JM, Han HJ. Autotaxin-LPA axis regulates hMSC migration by adherent junction disruption and cytoskeletal rearrangement via LPAR1/3-dependent PKC/GSK3β/β-catenin and PKC/Rho GTPase pathways. Stem Cells 2015; 33:819-32. [PMID: 25376707 DOI: 10.1002/stem.1882] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Revised: 09/30/2014] [Accepted: 10/15/2014] [Indexed: 12/29/2022]
Abstract
Bioactive molecules and stem cell-based regenerative engineering is emerging a promising approach for regenerating tissues. Autotaxin (ATX) is a key enzyme that regulates lysophosphatidic acid (LPA) levels in biological fluids, which exerts a wide range of cellular functions. However, the biological role of ATX in human umbilical cord blood-derived mesenchymal stem cells (hMSCs) migration remains to be fully elucidated. In this study, we observed that hMSCs, which were stimulated with LPA, accelerated wound healing, and LPA increased the migration of hMSCs into a wound site in a mouse skin wound healing model. In an experiment to investigate the effect of LPA on hMSC migration, ATX and LPA increased hMSC migration in a dose-dependent manner, and LPA receptor 1/3 siRNA transfections inhibited the ATX-induced cell migration. Furthermore, LPA increased Ca(2+) influx and PKC phosphorylation, which were blocked by Gαi and Gαq knockdown as well as by Ptx pretreatment. LPA increased GSK3β phosphorylation and β-catenin activation. LPA induced the cytosol to nuclear translocation of β-catenin, which was inhibited by PKC inhibitors. LPA stimulated the binding of β-catenin on the E-box located in the promoter of the CDH-1 gene and decreased CDH-1 promoter activity. In addition, the ATX and LPA-induced increase in hMSC migration was blocked by β-catenin siRNA transfection. LPA-induced PKC phosphorylation is also involved in Rac1 and CDC42 activation, and Rac1 and CDC42 knockdown abolished LPA-induced F-actin reorganization. In conclusion, ATX/LPA stimulates the migration of hMSCs through LPAR1/3-dependent E-cadherin reduction and cytoskeletal rearrangement via PKC/GSK3β/β-catenin and PKC/Rho GTPase pathways.
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Affiliation(s)
- Jung Min Ryu
- Department of Veterinary Physiology, College of Veterinary Medicine, Research Institute for Veterinary Science, Seoul National University, Seoul, South Korea; BK21 PLUS Creative Veterinary Research Center, Seoul National University, Seoul, South Korea
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20
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Choi HY, Saha SK, Kim K, Kim S, Yang GM, Kim B, Kim JH, Cho SG. G protein-coupled receptors in stem cell maintenance and somatic reprogramming to pluripotent or cancer stem cells. BMB Rep 2015; 48:68-80. [PMID: 25413305 PMCID: PMC4352616 DOI: 10.5483/bmbrep.2015.48.2.250] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Indexed: 12/13/2022] Open
Abstract
G protein-coupled receptors (GPCRs) are a large class of transmembrane receptors categorized into five distinct families: rhodopsin, secretin, adhesion, glutamate, and frizzled. They bind and regulate 80% of all hormones and account for 20-50% of the pharmaceuticals currently on the market. Hundreds of GPCRs integrate and coordinate the functions of individual cells, mediating signaling between various organs. GPCRs are crucial players in tumor progression, adipogenesis, and inflammation. Several studies have also confirmed their central roles in embryonic development and stem cell maintenance. Recently, GPCRs have emerged as key players in the regulation of cell survival, proliferation, migration, and self-renewal in pluripotent (PSCs) and cancer stem cells (CSCs). Our study and other reports have revealed that the expression of many GPCRs is modulated during the generation of induced PSCs (iPSCs) or CSCs as well as during CSC sphere formation. These GPCRs may have crucial roles in the regulation of selfrenewal and other biological properties of iPSCs and CSCs. This review addresses the current understanding of the role of GPCRs in stem cell maintenance and somatic reprogramming to PSCs or CSCs.
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Affiliation(s)
- Hye Yeon Choi
- Department of Animal Biotechnology, Animal Resources Research Center, and Incurable Disease Animal Model and Stem Cell Institute (IDASI), Konkuk University, Seoul 143-701, Korea
| | - Subbroto Kumar Saha
- Department of Animal Biotechnology, Animal Resources Research Center, and Incurable Disease Animal Model and Stem Cell Institute (IDASI), Konkuk University, Seoul 143-701, Korea
| | - Kyeongseok Kim
- Department of Animal Biotechnology, Animal Resources Research Center, and Incurable Disease Animal Model and Stem Cell Institute (IDASI), Konkuk University, Seoul 143-701, Korea
| | - Sangsu Kim
- Department of Animal Biotechnology, Animal Resources Research Center, and Incurable Disease Animal Model and Stem Cell Institute (IDASI), Konkuk University, Seoul 143-701, Korea
| | - Gwang-Mo Yang
- Department of Animal Biotechnology, Animal Resources Research Center, and Incurable Disease Animal Model and Stem Cell Institute (IDASI), Konkuk University, Seoul 143-701, Korea
| | - BongWoo Kim
- Department of Animal Biotechnology, Animal Resources Research Center, and Incurable Disease Animal Model and Stem Cell Institute (IDASI), Konkuk University, Seoul 143-701, Korea
| | - Jin-hoi Kim
- Department of Animal Biotechnology, Animal Resources Research Center, and Incurable Disease Animal Model and Stem Cell Institute (IDASI), Konkuk University, Seoul 143-701, Korea
| | - Ssang-Goo Cho
- Department of Animal Biotechnology, Animal Resources Research Center, and Incurable Disease Animal Model and Stem Cell Institute (IDASI), Konkuk University, Seoul 143-701, Korea
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21
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Tran TDN, Yao S, Hsu WH, Gimble JM, Bunnell BA, Cheng H. Arginine vasopressin inhibits adipogenesis in human adipose-derived stem cells. Mol Cell Endocrinol 2015; 406:1-9. [PMID: 25697345 PMCID: PMC4752440 DOI: 10.1016/j.mce.2015.02.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Revised: 01/15/2015] [Accepted: 02/09/2015] [Indexed: 11/27/2022]
Abstract
Intracellular Ca(2+) signaling is important for stem cell differentiation and there is evidence it may coordinate the process. Arginine vasopressin (AVP) is a neuropeptide hormone secreted mostly from the posterior pituitary gland and increases Ca(2+) signals mainly via V1 receptors. However, the role of AVP in adipogenesis of human adipose-derived stem cells (hASCs) is unknown. In this study, we identified the V1a receptor gene in hASCs and demonstrated that AVP stimulation increased intracellular Ca(2+) concentration during adipogenesis. This effect was mediated via V1a receptors, Gq-proteins and the PLC-IP3 pathway. These Ca(2+) signals were due to endoplasmic reticulum release and influx from the extracellular space. Furthermore, AVP supplementation to the adipogenic medium decreased the number of adipocytes and adipocyte marker genes during differentiation. The effect of AVP on adipocyte formation was reversed by the V1a receptor blocker V2255. These findings suggested that AVP may function to inhibit adipocyte differentiation.
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Affiliation(s)
- Tran D N Tran
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA
| | - Shaomian Yao
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA
| | - Walter H Hsu
- Department of Biomedical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, USA
| | - Jeffrey M Gimble
- Stem Cell Biology Laboratory, Pennington Biomedical Research Center, Louisiana State University, Baton Rouge, LA 70808, USA
| | - Bruce A Bunnell
- Department of Pharmacology, Tulane Center for Stem Cell Research and Regenerative Medicine and Division of Regenerative Medicine of Tulane National Primate Research Center, Tulane University Health Sciences Center, New Orleans, LA 70112, USA
| | - Henrique Cheng
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA.
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22
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Histamine-induced Ca²⁺ signalling is mediated by TRPM4 channels in human adipose-derived stem cells. Biochem J 2014; 463:123-34. [PMID: 25001294 DOI: 10.1042/bj20140065] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Intracellular Ca2+ oscillations are frequently observed during stem cell differentiation, and there is evidence that it may control adipogenesis. The transient receptor potential melastatin 4 channel (TRPM4) is a key regulator of Ca2+ signals in excitable and non-excitable cells. However, its role in human adipose-derived stem cells (hASCs), in particular during adipogenesis, is unknown. We have investigated TRPM4 in hASCs and examined its impact on histamine-induced Ca2+ signalling and adipogenesis. Using reverse transcription (RT)-PCR, we have identified TRPM4 gene expression in hASCs and human adipose tissue. Electrophysiological recordings revealed currents with the characteristics of those reported for the channel. Furthermore, molecular suppression of TRPM4 with shRNA diminished the Ca2+ signals generated by histamine stimulation, mainly via histamine receptor 1 (H1) receptors. The increases in intracellular Ca2+ were due to influx via voltage-dependent Ca2+ channels (VDCCs) of the L-type (Ca(v)1.2) and release from the endoplasmic reticulum. Inhibition of TRPM4 by shRNA inhibited adipogenesis as indicated by the reduction in lipid droplet accumulation and adipocyte gene expression. These results suggest that TRPM4 is an important regulator of Ca2+ signals generated by histamine in hASCs and is required for adipogenesis.
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23
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Xu XX, Zhang LH, Xie X. Somatostatin receptor type 2 contributes to the self-renewal of murine embryonic stem cells. Acta Pharmacol Sin 2014; 35:1023-30. [PMID: 24998255 DOI: 10.1038/aps.2014.51] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Accepted: 05/23/2014] [Indexed: 01/21/2023] Open
Abstract
AIM The roles of G-protein coupled receptors (GPCRs) in stem cell biology remain unclear. In this study, we aimed to identify GPCRs that might contribute to the self-renewal of mouse embryonic stem cells (mESCs). METHODS The expression levels of pluripotent genes and GPCR gene were detected in E14 mESCs using PCR array and RT-PCR. Immunofluorescent staining was used to examine the expression of pluripotent markers and the receptor translocation. Western blot analysis was used to detect phosphorylation of signal proteins. Knock-down of receptor was conducted to confirm its role in pluripotency maintenance. RESULTS In leukemia inhibitory factor (LIF)-free medium, mESCs lost the typical morphology of pluripotency, accompanied by markedly decreases in expression of somatostatin receptor type 2 (SSTR2), as well as the pluripotency biomarkers Oct4, Sox2, Rex1 and Nanog. Addition of the SSTR2 agonist octreotide or seglitide (0.1-30 μmol/L) in LIF-free medium dose-dependently promoted the self-renewal of mESCs, whereas the SSTR2 antagonist S4 (0.03-3 μmol/L) dose-dependently blocked octreotide-induced self-renewal. Knock-down of SSTR2 significantly decreased the self-renewal of mESCs even in the presence of LIF. Addition of LIF (1000 U/mL) or octreotide (1 μmol/L) in LIF-free medium significantly increased both phosphorylation and nuclear ocalization of STAT3. CONCLUSION The activation of SSTR2 contributes to the self-renewal of mESCs via activation of the STAT3 pathway.
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Abstract
Many tissues of the body cannot only repair themselves, but also self-renew, a property mainly due to stem cells and the various mechanisms that regulate their behavior. Stem cell biology is a relatively new field. While advances are slowly being realized, stem cells possess huge potential to ameliorate disease and counteract the aging process, causing its speculation as the next panacea. Amidst public pressure to advance rapidly to clinical trials, there is a need to understand the biology of stem cells and to support basic research programs. Without a proper comprehension of how cells and tissues are maintained during the adult life span, clinical trials are bound to fail. This review will cover the basic biology of stem cells, the various types of stem cells, their potential function, and the advantages and disadvantages to their use in medicine. We will next cover the role of G protein-coupled receptors in the regulation of stem cells and their potential in future clinical applications.
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Affiliation(s)
- VAN A. DOZE
- Department of Pharmacology, Physiology and Therapeutics, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203, USA (V.A.D.), and Department of Molecular Cardiology, Lerner Research Institute, The Cleveland Clinic Foundation, Cleveland, OH 44195, USA (D.M.P.)
| | - DIANNE M. PEREZ
- Department of Pharmacology, Physiology and Therapeutics, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203, USA (V.A.D.), and Department of Molecular Cardiology, Lerner Research Institute, The Cleveland Clinic Foundation, Cleveland, OH 44195, USA (D.M.P.)
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ORAI3 silencing alters cell proliferation and cell cycle progression via c-myc pathway in breast cancer cells. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2012; 1833:752-60. [PMID: 23266555 DOI: 10.1016/j.bbamcr.2012.12.009] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Revised: 12/12/2012] [Accepted: 12/14/2012] [Indexed: 11/20/2022]
Abstract
Members of the Orai family are highly selective calcium ion channels that play an important role in store-operated calcium entry. Among the three known Orai isoforms, Orai3 has gained increased attention, notably for its emerging role in cancer. We recently demonstrated that Orai3 channels are over-expressed in breast cancer (BC) biopsies, and involved specifically in proliferation, cell cycle progression and survival of MCF-7 BC cells. Here, we investigate the downstream signaling mechanisms affected by Orai3 silencing, leading to the subsequent functional impact specifically seen in MCF-7 cancer cells. We report a correlation between Orai3 and c-myc expression in tumor tissues and in the MCF-7 cancer cell line by demonstrating that Orai3 down-regulation reduces both expression and activity of the proto-oncogene c-myc. This is likely mediated through the MAP Kinase pathway, as we observed decreased pERK1/2 levels and cell-cycle arrest in G1 phase after Orai3 silencing. Our results provide strong evidence that the c-myc proto-oncogene is influenced by the store-operated calcium entry channel Orai3 through the MAP kinase pathway. This connection provides new clues in the downstream mechanism linking Orai3 channels and proliferation, cell cycle progression and survival of MCF-7 BC cells.
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Ermakov A, Pells S, Freile P, Ganeva VV, Wildenhain J, Bradley M, Pawson A, Millar R, De Sousa PA. A role for intracellular calcium downstream of G-protein signaling in undifferentiated human embryonic stem cell culture. Stem Cell Res 2012; 9:171-84. [DOI: 10.1016/j.scr.2012.06.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2011] [Revised: 06/01/2012] [Accepted: 06/26/2012] [Indexed: 12/28/2022] Open
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Apáti Á, Pászty K, Erdei Z, Szebényi K, Homolya L, Sarkadi B. Calcium signaling in pluripotent stem cells. Mol Cell Endocrinol 2012; 353:57-67. [PMID: 21945604 DOI: 10.1016/j.mce.2011.08.038] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2011] [Revised: 08/30/2011] [Accepted: 08/30/2011] [Indexed: 10/17/2022]
Abstract
Pluripotent stem cells represent a new source of biological material allowing the exploration of signaling phenomena during normal cell development and differentiation. Still, the calcium signaling pathways and intracellular calcium responses to various ligands or stress conditions have not been sufficiently explored as yet in embryonic or induced pluripotent stem cells and in their differentiated offspring. This is partly due to the special culturing conditions of these cell types, the rapid morphological and functional changes in heterogeneous cell populations during early differentiation, and methodological problems in cellular calcium measurements. In this paper, we review the currently available data in the literature on calcium signaling in pluripotent stem cells and discuss the potential shortcomings of these studies. Various assay methods are surveyed for obtaining reliable data both in undifferentiated embryonic stem cells and in specific, stem cell-derived human tissues. In this paper, we present the modulation of calcium signaling in human embryonic stem cells (hESC) and in their derivates; mesenchymal stem cell like (MSCl) cells and cardiac tissues using the fluorescent calcium indicator Fluo-4 and confocal microscopy. LPA, trypsin and angiotensin II were effective in inducing calcium signals both in HUES9 and MSCl cells. Histamine and thrombin induced calcium signal exclusively in the MSCl cells, while ATP was effective only in HUES9 cells. There was no calcium signal evoked by GABA, even at relatively high concentrations. In stem cell-derived cardiomyocytes a rapid increase in the beating rate and an increase of the calcium signal peaks could be observed after the addition of adrenaline, while verapamil led to a strong decrease in cellular calcium and stopped spontaneous contractions in a relaxed state.
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Affiliation(s)
- Ágota Apáti
- Membrane Research Group of the Hungarian Academy of Sciences, Semmelweis University, Budapest, Hungary
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Tonelli FMP, Santos AK, Gomes DA, da Silva SL, Gomes KN, Ladeira LO, Resende RR. Stem cells and calcium signaling. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2012; 740:891-916. [PMID: 22453975 DOI: 10.1007/978-94-007-2888-2_40] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The increasing interest in stem cell research is linked to the promise of developing treatments for many lifethreatening, debilitating diseases, and for cell replacement therapies. However, performing these therapeutic innovations with safety will only be possible when an accurate knowledge about the molecular signals that promote the desired cell fate is reached. Among these signals are transient changes in intracellular Ca(2+) concentration [Ca(2+)](i). Acting as an intracellular messenger, Ca(2+) has a key role in cell signaling pathways in various differentiation stages of stem cells. The aim of this chapter is to present a broad overview of various moments in which Ca(2+)-mediated signaling is essential for the maintenance of stem cells and for promoting their development and differentiation, also focusing on their therapeutic potential.
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Affiliation(s)
- Fernanda M P Tonelli
- Nanomaterials Laboratory, Department of Physics, Insitute of Exact Sciences, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
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Kobayashi NR, Hawes SM, Crook JM, Pébay A. G-protein coupled receptors in stem cell self-renewal and differentiation. Stem Cell Rev Rep 2010; 6:351-66. [PMID: 20625855 DOI: 10.1007/s12015-010-9167-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Stem cells have great potential for understanding early development, treating human disease, tissue trauma and early phase drug discovery. The factors that control the regulation of stem cell survival, proliferation, migration and differentiation are still emerging. Some evidence now exists demonstrating the potent effects of various G-protein coupled receptor (GPCR) ligands on the biology of stem cells. This review aims to give an overview of the current knowledge of the regulation of embryonic and somatic stem cell maintenance and differentiation by GPCR ligands.
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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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Abstract
Induced pluripotent stem cells (iPSC) were first generated from somatic cells via the transduction of four 'Yamanaka' factors, Oct4, Sox2, Klf4 and c-Myc. Because iPSC are similar to embryonic stem cells (ESC) and can be differentiated into any cell type of choice, iPSC have the potential to become a platform for personalized medicine by allowing a patient's own cells to become a source of therapeutic tissue. This review describes the main challenges in iPSC technology by focusing on its application to hematologic diseases. The explosive interest in improving iPSC technology has generated numerous genetic and chemical methods for iPSC derivation, but these methods must be evaluated comparatively for their safety and efficacy because there are risks of genetic abnormalities and oncogenesis. Competent iPSC will need to be selected carefully based on physical, genetic and functional criteria, and differentiated efficiently into hematopoietic stem cells via modulation of several signaling pathways before they prove valuable in the clinic.
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Affiliation(s)
- Peter Geon Kim
- Division of Pediatric Hematology Oncology, Children's Hospital, Boston, Massachusetts 02115, USA
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Abstract
Autotaxin is a protein of approximately 900 amino acids discovered in the early 1990s. Over the past 15 years, a strong association between cancer cells and autotaxin production has been observed. Recent publications indicate that autotaxin and the capacity of cancer to metastasise are intimately linked. The discovery of new molecular targets in pharmacology is a mixture of pure luck, hard work and industrial strategy. Despite a crucial and desperate need for new therapeutic tools, many targets are approached in oncology, but only a few are validated and end up at the patient bed. Outside the busy domain of kinases, few targets have been discovered that can be useful in treating cancer, particularly metastatic processes. The fortuitous relationship between autotaxin and lysophosphatidic acid renders the results of observations made in the diabetes/obesity context considerably important. The literature provides observations that may aid in redesigning experiments to validate autotaxin as a potential oncology target.
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Affiliation(s)
- Jean A Boutin
- Pharmacologie Moléculaire et Cellulaire, Institut de Recherches SERVIER, Croissy-sur-Seine, France.
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