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Won A, Choi S, Kim A, Hong J. Effect of DNA aptamer through blocking of negative regulation of Wnt/β-catenin signaling in human hair follicle dermal papilla cells. Skin Res Technol 2023; 29:e13326. [PMID: 37231925 PMCID: PMC10182398 DOI: 10.1111/srt.13326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 04/03/2023] [Indexed: 05/27/2023]
Abstract
BACKGROUND When Wnt binds to the N-terminal of Frizzled, a conformational change occurs in the C-terminal of Frizzled, which binds to Dishevelled1 (Dvl1), a Wnt signaling component protein. When Dvl1 binds to the C-terminal of Frizzled, the concentration of β-catenin increases and it enters the nucleus to transmit cell proliferation signals. CXXC-type zinc finger protein 5 (CXXC5) binds to the Frizzled binding site of Dvl1 and interferes with Dvl1-Frizzled binding. Therefore, blocking CXXC5-Dvl1 binding may induce Wnt signal transduction. MATERIALS AND METHODS We used WD-aptamer, a DNA aptamer that specifically binds to Dvl1 and interferes with CXXC5-Dvl1 interaction. We confirmed the penetration of WD-aptamer into human hair follicle dermal papilla cells (HFDPCs) and measured β-catenin expression following treatment with WD-aptamer in HFDPCs, wherein Wnt signaling was activated by Wnt3a. In addition, MTT assay was performed to investigate the effect of WD-aptamer on cell proliferation. RESULTS WD-aptamer penetrated the cell, affected Wnt signaling, and increased β-catenin expression, which plays an important role in signaling. Additionally, WD-aptamer induced HFDPC proliferation. CONCLUSION CXXC5-associated negative feedback of Wnt/β-catenin signaling can be regulated by interfering with CXXC5-Dvl1 interaction.
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Affiliation(s)
- Areum Won
- Nexmos, Inc.Sinsu‐ro, Suji‐guYongin‐siGyeonggi‐doRepublic of Korea
| | - Sooho Choi
- Nexmos, Inc.Sinsu‐ro, Suji‐guYongin‐siGyeonggi‐doRepublic of Korea
| | - A‐Ru Kim
- Nexmos, Inc.Sinsu‐ro, Suji‐guYongin‐siGyeonggi‐doRepublic of Korea
| | - Junkee Hong
- Nexmos, Inc.Sinsu‐ro, Suji‐guYongin‐siGyeonggi‐doRepublic of Korea
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2
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Xue R, Lin W, Sun J, Watanabe M, Xu A, Araki M, Nasu Y, Tang Z, Huang P. The role of Wnt signaling in male reproductive physiology and pathology. Mol Hum Reprod 2021; 27:gaaa085. [PMID: 33543289 DOI: 10.1093/molehr/gaaa085] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 11/26/2020] [Indexed: 12/14/2022] Open
Abstract
Accumulating evidence has shown that Wnt signaling is deeply involved in male reproductive physiology, and malfunction of the signal path can cause pathological changes in genital organs and sperm cells. These abnormalities are diverse in manifestation and have been constantly found in the knockout models of Wnt studies. Nevertheless, most of the research solely focused on a certain factor in the Wnt pathway, and there are few reports on the overall relation between Wnt signals and male reproductive physiology. In our review, Wnt findings relating to the reproductive system were sought and summarized in terms of Wnt ligands, Wnt receptors, Wnt intracellular signals and Wnt regulators. By sorting out and integrating relevant functions, as well as underlining the controversies among different reports, our review aims to offer an overview of Wnt signaling in male reproductive physiology and pathology for further mechanistic studies.
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Affiliation(s)
- Ruizhi Xue
- Department of Urology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
- Department of Urology, Xiangya Hospital, Central South University, Changsha, China
| | - Wenfeng Lin
- Department of Urology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Jingkai Sun
- Department of Urology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
- Department of Urology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Masami Watanabe
- Department of Urology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Abai Xu
- Department of Urology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Motoo Araki
- Department of Urology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Yasutomo Nasu
- Department of Urology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Zhengyan Tang
- Department of Urology, Xiangya Hospital, Central South University, Changsha, China
| | - Peng Huang
- Department of Urology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
- Department of Urology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Okayama Medical Innovation Center, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
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3
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de Rezende MM, Ng-Blichfeldt JP, Justo GZ, Paredes-Gamero EJ, Gosens R. Divergent effects of Wnt5b on IL-3- and GM-CSF-induced myeloid differentiation. Cell Signal 2019; 67:109507. [PMID: 31857239 PMCID: PMC7116107 DOI: 10.1016/j.cellsig.2019.109507] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 12/12/2019] [Accepted: 12/16/2019] [Indexed: 11/17/2022]
Abstract
The multiple specialized cell types of the hematopoietic system originate from differentiation of hematopoietic stem cells and progenitors (HSPC), which can generate both lymphoid and myeloid lineages. The myeloid lineage is preferentially maintained during ageing, but the mechanisms that contribute to this process are incompletely understood. Here, we studied the roles of Wnt5a and Wnt5b, ligands that have previously been linked to hematopoietic stem cell ageing and that are abundantly expressed by both hematopoietic progenitors and bone-marrow derived niche cells. Whereas Wnt5a had no major effects on primitive cell differentiation, Wnt5b had profound and divergent effects on cytokine-induced myeloid differentiation. Remarkably, while IL-3- mediated myeloid differentiation was largely repressed by Wnt5b, GM-CSF-induced myeloid differentiation was augmented. Furthermore, in the presence of IL-3, Wnt5b enhanced HSPC self-renewal, whereas in the presence ofGM-CSF, Wnt5b accelerated differentiation, leading to progenitor cell exhaustion. Our results highlight discrepancies between IL-3 and GM-CSF, and reveal novel effects of Wnt5b on the hematopoietic system.
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Affiliation(s)
- Marina Mastelaro de Rezende
- Departamento de Bioquímica, Universidade Federal de São Paulo (UNIFESP), São Paulo 04044-020, Brazil; Department of Molecular Pharmacology, University of Groningen, Groningen 9713AV, Netherlands
| | - John-Poul Ng-Blichfeldt
- Department of Molecular Pharmacology, University of Groningen, Groningen 9713AV, Netherlands; MRC Laboratory of Molecular Biology, Cambridge Biomedical Campus, Cambridge CB2 0QH, UK
| | - Giselle Zenker Justo
- Departamento de Bioquímica, Universidade Federal de São Paulo (UNIFESP), São Paulo 04044-020, Brazil; Departamento de Ciências Farmacêuticas, Universidade Federal de São Paulo (UNIFESP), Diadema 09913-030, Brazil
| | - Edgar Julian Paredes-Gamero
- Departamento de Bioquímica, Universidade Federal de São Paulo (UNIFESP), São Paulo 04044-020, Brazil; Faculdade de Ciências Farmacêuticas, Alimentos e Nutrição, Universidade Federal de Mato Grosso do Sul, 79070-900, Campo Grande, Mato Grosso do Sul, Brazil
| | - Reinoud Gosens
- Department of Molecular Pharmacology, University of Groningen, Groningen 9713AV, Netherlands.
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Abstract
Deregulation of the Wnt signal transduction pathway underlies numerous congenital disorders and cancers. Axin, a concentration-limiting scaffold protein, facilitates assembly of a “destruction complex” that prevents signaling in the unstimulated state and a plasma membrane-associated “signalosome” that activates signaling following Wnt stimulation. In the classical model, Axin is cytoplasmic under basal conditions, but relocates to the cell membrane after Wnt exposure; however, due to the very low levels of endogenous Axin, this model is based largely on examination of Axin at supraphysiological levels. Here, we analyze the subcellular distribution of endogenous Drosophila Axin in vivo and find that a pool of Axin localizes to cell membrane proximal puncta even in the absence of Wnt stimulation. Axin localization in these puncta is dependent on the destruction complex component Adenomatous polyposis coli (Apc). In the unstimulated state, the membrane association of Axin increases its Tankyrase-dependent ADP-ribosylation and consequent proteasomal degradation to control its basal levels. Furthermore, Wnt stimulation does not result in a bulk redistribution of Axin from cytoplasmic to membrane pools, but causes an initial increase of Axin in both of these pools, with concomitant changes in two post-translational modifications, followed by Axin proteolysis hours later. Finally, the ADP-ribosylated Axin that increases rapidly following Wnt stimulation is membrane associated. We conclude that even in the unstimulated state, a pool of Axin forms membrane-proximal puncta that are dependent on Apc, and that membrane association regulates both Axin levels and Axin’s role in the rapid activation of signaling that follows Wnt exposure. Axin is a scaffold protein with essential roles in Wnt signal transduction. In the classical model, the transition from the unstimulated to stimulated state is thought to be achieved by recruitment of Axin from cytosol to plasma membrane. We find that a pool of endogenous Drosophila Axin is localized in puncta juxtaposed with the cell membrane even under basal conditions and is targeted for degradation by the ADP-ribose polymerase Tankyrase. Wnt stimulation initially results in increased Axin levels in both the cytosolic and membrane pools, which may enhance the robust activation of signaling.
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Affiliation(s)
- Zhenghan Wang
- Department of Molecular and Systems Biology and the Norris Cotton Cancer Center, Geisel School of Medicine at Dartmouth College, Hanover, NH, United States of America
| | - Ofelia Tacchelly-Benites
- Department of Molecular and Systems Biology and the Norris Cotton Cancer Center, Geisel School of Medicine at Dartmouth College, Hanover, NH, United States of America
| | - Eungi Yang
- Department of Molecular and Systems Biology and the Norris Cotton Cancer Center, Geisel School of Medicine at Dartmouth College, Hanover, NH, United States of America
| | - Yashi Ahmed
- Department of Molecular and Systems Biology and the Norris Cotton Cancer Center, Geisel School of Medicine at Dartmouth College, Hanover, NH, United States of America
- * E-mail:
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Wang X, Wang X, Liu J, Cai T, Guo L, Wang S, Wang J, Cao Y, Ge J, Jiang Y, Tredget EE, Cao M, Wu Y. Hair Follicle and Sebaceous Gland De Novo Regeneration With Cultured Epidermal Stem Cells and Skin-Derived Precursors. Stem Cells Transl Med 2016; 5:1695-1706. [PMID: 27458264 DOI: 10.5966/sctm.2015-0397] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Accepted: 05/12/2016] [Indexed: 12/17/2022] Open
Abstract
: Stem cell-based organ regeneration is purported to enable the replacement of impaired organs in the foreseeable future. Here, we demonstrated that a combination of cultured epidermal stem cells (Epi-SCs) derived from the epidermis and skin-derived precursors (SKPs) was capable of reconstituting functional hair follicles and sebaceous glands (SG). When Epi-SCs and SKPs were mixed in a hydrogel and implanted into an excisional wound in nude mice, the Epi-SCs formed de novo epidermis along with hair follicles, and SKPs contributed to dermal papilla in the neogenic hair follicles. Notably, a combination of culture-expanded Epi-SCs and SKPs derived from the adult human scalp were sufficient to generate hair follicles and hair. Bone morphogenetic protein 4, but not Wnts, sustained the expression of alkaline phosphatase in SKPs in vitro and the hair follicle-inductive property in vivo when SKPs were engrafted with neonatal epidermal cells into excisional wounds. In addition, Epi-SCs were capable of differentiating into sebocytes and formed de novo SGs, which excreted lipids as do normal SGs. Thus our results indicate that cultured Epi-SCs and SKPs are sufficient to generate de novo hair follicles and SGs, implying great potential to develop novel bioengineered skin substitutes with appendage genesis capacity. SIGNIFICANCE In postpartum humans, skin appendages lost in injury are not regenerated, despite the considerable achievement made in skin bioengineering. In this study, transplantation of a combination of culture-expanded epidermal stem cells and skin-derived progenitors from mice and adult humans led to de novo regeneration of functional hair follicles and sebaceous glands. The data provide transferable knowledge for the development of novel bioengineered skin substitutes with epidermal appendage regeneration capacity.
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Affiliation(s)
- Xiaoxiao Wang
- School of Life Sciences, Tsinghua University, Beijing, People's Republic of China
- Shenzhen Key Laboratory of Health Sciences and Technology, Graduate School at Shenzhen, Tsinghua University, Beijing, People's Republic of China
| | - Xusheng Wang
- School of Life Sciences, Tsinghua University, Beijing, People's Republic of China
- Shenzhen Key Laboratory of Health Sciences and Technology, Graduate School at Shenzhen, Tsinghua University, Beijing, People's Republic of China
| | - Jianjun Liu
- Medical Key Laboratory of Health Toxicology of Shenzhen, Shenzhen Center for Disease Control and Prevention, Shenzhen, People's Republic of China
| | - Ting Cai
- School of Life Sciences, Tsinghua University, Beijing, People's Republic of China
- Shenzhen Key Laboratory of Health Sciences and Technology, Graduate School at Shenzhen, Tsinghua University, Beijing, People's Republic of China
| | - Ling Guo
- Shenzhen Key Laboratory of Health Sciences and Technology, Graduate School at Shenzhen, Tsinghua University, Beijing, People's Republic of China
| | - Shujuan Wang
- State Key Laboratory Breeding Base-Shenzhen Key Laboratory of Chemical Biology, Graduate School at Shenzhen, Tsinghua University, Beijing, People's Republic of China
| | - Jinmei Wang
- Shenzhen Key Laboratory of Health Sciences and Technology, Graduate School at Shenzhen, Tsinghua University, Beijing, People's Republic of China
| | - Yanpei Cao
- Clinical Research Center, University College Dublin, Belfield, Dublin, Ireland
| | - Jianfeng Ge
- School of Life Sciences, Tsinghua University, Beijing, People's Republic of China
- Shenzhen Key Laboratory of Health Sciences and Technology, Graduate School at Shenzhen, Tsinghua University, Beijing, People's Republic of China
| | - Yuyang Jiang
- State Key Laboratory Breeding Base-Shenzhen Key Laboratory of Chemical Biology, Graduate School at Shenzhen, Tsinghua University, Beijing, People's Republic of China
| | - Edward E Tredget
- Wound Healing Research Group, Department of Surgery, University of Alberta, Edmonton, Alberta, Canada
| | - Mengjun Cao
- Shenzhen Fuhua Aesthetic Hospital, Shenzhen, People's Republic of China
| | - Yaojiong Wu
- Shenzhen Key Laboratory of Health Sciences and Technology, Graduate School at Shenzhen, Tsinghua University, Beijing, People's Republic of China
- Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, Beijing, People's Republic of China
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6
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Ramakrishnan VM, Tien KT, McKinley TR, Bocard BR, McCurry TM, Williams SK, Hoying JB, Boyd NL. Wnt5a Regulates the Assembly of Human Adipose Derived Stromal Vascular Fraction-Derived Microvasculatures. PLoS One 2016; 11:e0151402. [PMID: 26963616 PMCID: PMC4786226 DOI: 10.1371/journal.pone.0151402] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Accepted: 02/27/2016] [Indexed: 01/05/2023] Open
Abstract
Human adipose-derived stromal vascular fraction (hSVF) cells are an easily accessible, heterogeneous cell system that can spontaneously self-assemble into functional microvasculatures in vivo. However, the mechanisms underlying vascular self-assembly and maturation are poorly understood, therefore we utilized an in vitro model to identify potential in vivo regulatory mechanisms. We utilized passage one (P1) hSVF because of the rapid UEA1+ endothelium (EC) loss at even P2 culture. We exposed hSVF cells to a battery of angiogenesis inhibitors and found that the pan-Wnt inhibitor IWP2 produced the most significant hSVF-EC networking decrease (~25%). To determine which Wnt isoform(s) and receptor(s) may be involved, hSVF was screened by PCR for isoforms associated with angiogenesis, with only WNT5A and its receptor, FZD4, being expressed for all time points observed. Immunocytochemistry confirmed Wnt5a protein expression by hSVF. To see if Wnt5a alone could restore IWP2-induced EC network inhibition, recombinant human Wnt5a (0–150 ng/ml) was added to IWP2-treated cultures. The addition of rhWnt5a significantly increased EC network area and significantly decreased the ratio of total EC network length to EC network area compared to untreated controls. To determine if Wnt5a mediates in vivo microvascular self-assembly, 3D hSVF constructs containing an IgG isotype control, anti-Wnt5a neutralizing antibody or rhWnt5a were implanted subcutaneously for 2w in immune compromised mice. Compared to IgG controls, anti-Wnt5a treatment significantly reduced vessel length density by ~41%, while rhWnt5a significantly increased vessel length density by ~62%. However, anti-Wnt5a or rhWnt5a did not significantly affect the density of segments and nodes, both of which measure vascular complexity. Taken together, this data demonstrates that endogenous Wnt5a produced by hSVF plays a regulatory role in microvascular self-assembly in vivo. These findings also suggest that manipulating Wnt signaling could enhance control of hSVF vascularization in tissue engineering applications.
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Affiliation(s)
- Venkat M. Ramakrishnan
- Division of Cardiovascular Therapeutics, Cardiovascular Innovation Institute, University of Louisville, Louisville, Kentucky, United States of America
- Department of Physiology, University of Louisville, Louisville, Kentucky, United States of America
| | - Kevin T. Tien
- Division of Cardiovascular Therapeutics, Cardiovascular Innovation Institute, University of Louisville, Louisville, Kentucky, United States of America
| | - Thomas R. McKinley
- Division of Cardiovascular Therapeutics, Cardiovascular Innovation Institute, University of Louisville, Louisville, Kentucky, United States of America
| | - Braden R. Bocard
- Division of Cardiovascular Therapeutics, Cardiovascular Innovation Institute, University of Louisville, Louisville, Kentucky, United States of America
- Georgetown College, Georgetown, Kentucky, United States of America
| | - Terry M. McCurry
- Division of Plastic Surgery, Department of Surgery, University of Louisville, Louisville, Kentucky, United States of America
| | - Stuart K. Williams
- Division of Cardiovascular Therapeutics, Cardiovascular Innovation Institute, University of Louisville, Louisville, Kentucky, United States of America
- Department of Physiology, University of Louisville, Louisville, Kentucky, United States of America
| | - James B. Hoying
- Division of Cardiovascular Therapeutics, Cardiovascular Innovation Institute, University of Louisville, Louisville, Kentucky, United States of America
- Department of Physiology, University of Louisville, Louisville, Kentucky, United States of America
| | - Nolan L. Boyd
- Division of Cardiovascular Therapeutics, Cardiovascular Innovation Institute, University of Louisville, Louisville, Kentucky, United States of America
- Department of Physiology, University of Louisville, Louisville, Kentucky, United States of America
- * E-mail:
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7
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Ramos-Solano M, Meza-Canales ID, Torres-Reyes LA, Alvarez-Zavala M, Alvarado-Ruíz L, Rincon-Orozco B, Garcia-Chagollan M, Ochoa-Hernández AB, Ortiz-Lazareno PC, Rösl F, Gariglio P, Jave-Suárez LF, Aguilar-Lemarroy A. Expression of WNT genes in cervical cancer-derived cells: Implication of WNT7A in cell proliferation and migration. Exp Cell Res 2015; 335:39-50. [PMID: 25978974 DOI: 10.1016/j.yexcr.2015.05.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Revised: 04/30/2015] [Accepted: 05/04/2015] [Indexed: 01/05/2023]
Abstract
According to the multifactorial model of cervical cancer (CC) causation, it is now recognized that other modifications, in addition to Human papillomavirus (HPV) infection, are necessary for the development of this neoplasia. Among these, it has been proposed that a dysregulation of the WNT pathway might favor malignant progression of HPV-immortalized keratinocytes. The aim of this study was to identify components of the WNT pathway differentially expressed in CC vs. non-tumorigenic, but immortalized human keratinocytes. Interestingly, WNT7A expression was found strongly downregulated in cell lines and biopsies derived from CC. Restoration of WNT7A in CC-derived cell lines using a lentiviral gene delivery system or after adding a recombinant human protein decreases cell proliferation. Likewise, WNT7A silencing in non-tumorigenic cells markedly accelerates proliferation. Decreased WNT7A expression was due to hypermethylation at particular CpG sites. To our knowledge, this is the first study reporting reduced WNT7A levels in CC-derived cells and that ectopic WNT7A restoration negatively affects cell proliferation and migration.
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Affiliation(s)
- Moisés Ramos-Solano
- División de Inmunología, Centro de Investigación Biomédica de Occidente (CIBO)-Instituto Mexicano del Seguro Social (IMSS), Guadalajara, Jalisco, Mexico; Programa de Doctorado en Ciencias Biomédica, Centro Universitario de Ciencias de la Salud (CUCS), Universidad de Guadalajara, Guadalajara, Jalisco, Mexico.
| | - Ivan D Meza-Canales
- Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, 07745 Jena, Germany.
| | - Luis A Torres-Reyes
- División de Inmunología, Centro de Investigación Biomédica de Occidente (CIBO)-Instituto Mexicano del Seguro Social (IMSS), Guadalajara, Jalisco, Mexico; Programa de Doctorado en Ciencias Biomédica, Centro Universitario de Ciencias de la Salud (CUCS), Universidad de Guadalajara, Guadalajara, Jalisco, Mexico.
| | - Monserrat Alvarez-Zavala
- División de Inmunología, Centro de Investigación Biomédica de Occidente (CIBO)-Instituto Mexicano del Seguro Social (IMSS), Guadalajara, Jalisco, Mexico; Programa de Doctorado en Ciencias Biomédica, Centro Universitario de Ciencias de la Salud (CUCS), Universidad de Guadalajara, Guadalajara, Jalisco, Mexico.
| | - Liliana Alvarado-Ruíz
- División de Inmunología, Centro de Investigación Biomédica de Occidente (CIBO)-Instituto Mexicano del Seguro Social (IMSS), Guadalajara, Jalisco, Mexico; Programa de Doctorado en Ciencias Biomédica, Centro Universitario de Ciencias de la Salud (CUCS), Universidad de Guadalajara, Guadalajara, Jalisco, Mexico.
| | - Bladimiro Rincon-Orozco
- Division of Viral Transformation Mechanisms, German Cancer Research Center, Heidelberg, Germany.
| | - Mariel Garcia-Chagollan
- División de Inmunología, Centro de Investigación Biomédica de Occidente (CIBO)-Instituto Mexicano del Seguro Social (IMSS), Guadalajara, Jalisco, Mexico.
| | | | - Pablo C Ortiz-Lazareno
- División de Inmunología, Centro de Investigación Biomédica de Occidente (CIBO)-Instituto Mexicano del Seguro Social (IMSS), Guadalajara, Jalisco, Mexico.
| | - Frank Rösl
- Division of Viral Transformation Mechanisms, German Cancer Research Center, Heidelberg, Germany.
| | - Patricio Gariglio
- Departamento de Genética y Biología Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico.
| | - Luis F Jave-Suárez
- División de Inmunología, Centro de Investigación Biomédica de Occidente (CIBO)-Instituto Mexicano del Seguro Social (IMSS), Guadalajara, Jalisco, Mexico.
| | - Adriana Aguilar-Lemarroy
- División de Inmunología, Centro de Investigación Biomédica de Occidente (CIBO)-Instituto Mexicano del Seguro Social (IMSS), Guadalajara, Jalisco, Mexico.
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8
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Yu WZ, Chen XM, Niu WB, Wang F, Sun B, Sun YP. Role of Wnt5a in the differentiation of human embryonic stem cells into endometrium-like cells. Int J Clin Exp Pathol 2015; 8:5478-5484. [PMID: 26191253 PMCID: PMC4503124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 02/28/2015] [Accepted: 04/21/2015] [Indexed: 06/04/2023]
Abstract
OBJECTIVE To explore the effects of Wnt5a and Wint7a on the differentiation of human embryonic stem cells (hESCs) into endometrium-like cells, and provide a basis for establishing endometrium-like cell models and a cell source for carrying out further endometrium-related experiments. METHODS The hESCs established by our center were differentiated into endometrium-like cells in 4 different media including Wnt5a (Group A), Wnt7a (Group B), secreted frizzled related protein (sFRP, an inhibitor of Wnt signal pathway, Group C) and medium alone (Group D). In the differentiated terminal cells, the expressions of cytokeratin (CK) and vimentin were detected with immunofluorescence, and the mRNA levels of CK18, epithelial cell adhesion molecule (EPCAM), estrogen receptor (ER) and progesterone receptor (PR) were determined with RT-PCR. At the same time, the differentiated terminal cells were incubated in medium containing medroxyprogesterone followed by determination of prolactin (PRL). RESULTS RT-PCR indicated that mRNA levels of CK18, EPCAM, ER and PR were significantly higher in Group A (Wnt5a) than in other groups (all P<0.05), but were significantly lower in Group C (sFRP2) than in other groups (all P<0.05). The changing trend of PRL mRNA was consistent with that of above genes in the 4 groups. Immunofluorescence displayed that the expression of cytokeratin was the strongest in Group A (Wnt5a), and the weakest in Group C (sFRP2) among the 4 groups. CONCLUSION Wnt5a has promotive effects on the differentiation of hESCs into endometrium-like cells, but Wnt7a has no marked effects.
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Affiliation(s)
- Wen-Zhu Yu
- Reproductive Medical Center, The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052, China
- Reproductive Research Institute, Henan Provincial People’s Hospital (Reproductive research institute, Peoples Hospital of Zhengzhou University)Zhengzhou 450003, China
| | - Xue-Mei Chen
- Department of Human Anatomy, College of Basic Medical Sciences, Zhengzhou UniversityZhengzhou 450001, China
| | - Wen-Bin Niu
- Reproductive Medical Center, The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052, China
| | - Fang Wang
- Reproductive Medical Center, The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052, China
| | - Bo Sun
- Reproductive Medical Center, The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052, China
| | - Ying-Pu Sun
- Reproductive Medical Center, The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052, China
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9
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Abedini A, Zamberlam G, Boerboom D, Price CA. Non-canonical WNT5A is a potential regulator of granulosa cell function in cattle. Mol Cell Endocrinol 2015; 403:39-45. [PMID: 25600632 DOI: 10.1016/j.mce.2015.01.017] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Revised: 12/18/2014] [Accepted: 01/12/2015] [Indexed: 11/29/2022]
Abstract
The WNT family has been implicated in follicular development in rodents, however, the role of WNTs in the follicle of monovulatory species is poorly understood. The objective of this study was to determine the potential roles of WNTs in bovine granulosa cell function. Cells cultured in serum-free medium expressed mRNA encoding WNT2B, WNT5B and WNT5A. Levels of WNT5A, but not of WNT2B or WNT5B mRNA, were down-regulated by FSH. Addition of WNT5A to cultured cells suppressed FSH-stimulated estradiol and progesterone secretion, and levels of mRNA encoding the steroidogenic enzymes CYP19A1, CYP11A1 and the FSH receptor, but had no effect on cell proliferation or apoptosis. Immunoblot experiments showed that WNT5A reduced activation of CTNNB1 and stimulated phosphorylation of MAPK8 and JUN proteins. We conclude that WNT5A is a negative regulator of FSH-stimulated granulosa cell steroidogenesis, and that it acts by suppressing canonical WNT signaling activity and inducing the non-canonical MAPK8/JUN pathway.
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Affiliation(s)
- Atefeh Abedini
- Centre de Recherche en Reproduction Animale, Faculté de Médecine Vétérinaire, Université de Montréal, St-Hyacinthe, QC J2S 7C6, Canada
| | - Gustavo Zamberlam
- Centre de Recherche en Reproduction Animale, Faculté de Médecine Vétérinaire, Université de Montréal, St-Hyacinthe, QC J2S 7C6, Canada
| | - Derek Boerboom
- Centre de Recherche en Reproduction Animale, Faculté de Médecine Vétérinaire, Université de Montréal, St-Hyacinthe, QC J2S 7C6, Canada
| | - Christopher A Price
- Centre de Recherche en Reproduction Animale, Faculté de Médecine Vétérinaire, Université de Montréal, St-Hyacinthe, QC J2S 7C6, Canada.
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10
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Abstract
The non-canonical Wnt receptor, Ryk, promotes chemorepulsive axon guidance in the developing mouse brain and spinal cord in response to Wnt5a. Ryk has also been identified as a major suppressor of axonal regrowth after spinal cord injury. Thus, a comprehensive understanding of how growing axons and dendrites respond to Wnt5a-mediated Ryk activation is required if we are to overcome this detrimental activity. Here we undertook a detailed analysis of the effect of Wnt5a/Ryk interactions on axonal and dendritic growth in dissociated embryonic mouse cortical neuron cultures, focusing on callosal neurons known to be responsive to Ryk-induced chemorepulsion. We show that Ryk inhibits axonal growth in response to Wnt5a. We also show that Wnt5a inhibits dendrite growth independently of Ryk. However, this inhibition is relieved when Ryk is present. Therefore, Wnt5a-mediated Ryk activation triggers divergent responses in callosal axons and dendrites in the in vitro context.
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Affiliation(s)
- Charlotte E J Clark
- Queensland Brain Institute, The University of Queensland, St Lucia , Queensland , Australia
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11
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Kwack MH, Kim MK, Kim JC, Sung YK. Wnt5a attenuates Wnt/β-catenin signalling in human dermal papilla cells. Exp Dermatol 2013; 22:229-31. [PMID: 23489428 DOI: 10.1111/exd.12101] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/23/2013] [Indexed: 12/16/2022]
Abstract
Findings of recent studies have demonstrated modulation of Wnt/β-catenin signalling by Wnt5a, which is highly expressed in hair follicular dermal papilla (DP) in vivo. Here, we investigated the question of whether Wnt5a can affect canonical Wnt/β-catenin signalling in DP cells. Treatment with Wnt5a resulted in attenuation of Wnt3a-mediated elevation of β-catenin signalling, which was increased by Wnt5a siRNA transfection in cultured DP cells, as examined by reporter assay. In addition, treatment with Wnt5a resulted in repressed Wnt3a-mediated expression of Axin2, EP2 and LEF1 in cultured DP cells, whereas Wnt5a siRNA transfection resulted in increased Wnt3a-mediated expression of the genes in isolated DPs of cultured hair follicles. Moreover, treatment with Wnt5a resulted in attenuation of Wnt3a-mediated accumulation of β-catenin in the nucleus in DP cells. Our data strongly suggest that Wnt5a acts as an autocrine factor and attenuates canonical Wnt signalling pathway in human DP cells.
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12
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Titmarsh DM, Hudson JE, Hidalgo A, Elefanty AG, Stanley EG, Wolvetang EJ, Cooper-White JJ. Microbioreactor arrays for full factorial screening of exogenous and paracrine factors in human embryonic stem cell differentiation. PLoS One 2012; 7:e52405. [PMID: 23300662 PMCID: PMC3530582 DOI: 10.1371/journal.pone.0052405] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2012] [Accepted: 11/14/2012] [Indexed: 02/06/2023] Open
Abstract
Timed exposure of pluripotent stem cell cultures to exogenous molecules is widely used to drive differentiation towards desired cell lineages. However, screening differentiation conditions in conventional static cultures can become impractical in large parameter spaces, and is intrinsically limited by poor spatiotemporal control of the microenvironment that also makes it impossible to determine whether exogenous factors act directly or through paracrine-dependent mechanisms. We detail here the development of a continuous flow microbioreactor array platform that combines full-factorial multiplexing of input factors with progressive accumulation of paracrine factors through serially-connected culture chambers, and further, the use of this system to explore the combinatorial parameter space of both exogenous and paracrine factors involved in human embryonic stem cell (hESC) differentiation to a MIXL1-GFP(+) primitive streak-like population. We show that well known inducers of primitive streak (BMP, Activin and Wnt signals) do not simply act directly on hESC to induce MIXL1 expression, but that this requires accumulation of surplus, endogenous factors; and, that conditioned medium or FGF-2 supplementation is able to offset this. Our approach further reveals the presence of a paracrine, negative feedback loop to the MIXL1-GFP(+) population, which can be overcome with GSK-3β inhibitors (BIO or CHIR99021), implicating secreted Wnt inhibitory signals such as DKKs and sFRPs as candidate effectors. Importantly, modulating paracrine effects identified in microbioreactor arrays by supplementing FGF-2 and CHIR in conventional static culture vessels resulted in improved differentiation outcomes. We therefore demonstrate that this microbioreactor array platform uniquely enables the identification and decoding of complex soluble factor signalling hierarchies, and that this not only challenges prevailing strategies for extrinsic control of hESC differentiation, but also is translatable to conventional culture systems.
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Affiliation(s)
- Drew M. Titmarsh
- Australian Institute for Bioengineering & Nanotechnology, The University of Queensland, St. Lucia, Queensland, Australia
| | - James E. Hudson
- Australian Institute for Bioengineering & Nanotechnology, The University of Queensland, St. Lucia, Queensland, Australia
| | - Alejandro Hidalgo
- Australian Institute for Bioengineering & Nanotechnology, The University of Queensland, St. Lucia, Queensland, Australia
| | - Andrew G. Elefanty
- Murdoch Childrens Research Institute, The Royal Children’s Hospital, Flemington Road, Parkville, Victoria, Australia
- Monash Immunology and Stem Cell Laboratories, Monash University, Clayton, Victoria, Australia
| | - Edouard G. Stanley
- Murdoch Childrens Research Institute, The Royal Children’s Hospital, Flemington Road, Parkville, Victoria, Australia
- Monash Immunology and Stem Cell Laboratories, Monash University, Clayton, Victoria, Australia
| | - Ernst J. Wolvetang
- Australian Institute for Bioengineering & Nanotechnology, The University of Queensland, St. Lucia, Queensland, Australia
| | - Justin J. Cooper-White
- Australian Institute for Bioengineering & Nanotechnology, The University of Queensland, St. Lucia, Queensland, Australia
- School of Chemical Engineering, The University of Queensland, St. Lucia, Queensland, Australia
- * E-mail:
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13
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Kim SY, Kim S, Yun-Choi HS, Jho EH. Wnt5a potentiates U46619-induced platelet aggregation via the PI3K/Akt pathway. Mol Cells 2011; 32:333-6. [PMID: 21870110 PMCID: PMC3887641 DOI: 10.1007/s10059-011-0134-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2011] [Accepted: 07/12/2011] [Indexed: 12/31/2022] Open
Abstract
Platelet aggregation plays crucial roles in the formation of hemostatic plugs and thrombosis. Although it was recently shown that canonical Wnt signaling negatively regulates platelet aggregation, the role of non-canonical Wnt signaling remains unknown. Here, we observed that Wnt5a, one of the non-canonical Wnts, positively regulated platelet aggregation. Platelet aggregation was potentiated by the addition of Wnt5a to collagen-or U46619-induced rat platelet rich plasma (PRP). Treatment with Wnt5a to U46619-stimulated PRP resulted in an increase in the level of phosphorylated Akt, whereas phosphorylation of PKCδ and JNK1 was unaffected. In addition, inhibition of PI3K blocked the potentiating effect of Wnt5a. Taken together, these results suggest that Wnt5a potentiates U46619-induced platelet aggregation via the PI3K/Akt pathway.
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Affiliation(s)
- Sun Young Kim
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 151-742, Korea
- These authors contributed equally to this work
| | - Sewoon Kim
- Department of Life Science, University of Seoul, Seoul 130-743, Korea
- These authors contributed equally to this work
| | - Hye Sook Yun-Choi
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 151-742, Korea
| | - Eek-hoon Jho
- Department of Life Science, University of Seoul, Seoul 130-743, Korea
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14
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Li B, Zhong L, Yang X, Andersson T, Huang M, Tang SJ. WNT5A signaling contributes to Aβ-induced neuroinflammation and neurotoxicity. PLoS One 2011; 6:e22920. [PMID: 21857966 PMCID: PMC3157339 DOI: 10.1371/journal.pone.0022920] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2011] [Accepted: 07/07/2011] [Indexed: 11/18/2022] Open
Abstract
Neurodegenration is a pathological hallmark of Alzheimer's disease (AD), but the underlying molecular mechanism remains elusive. Here, we present evidence that reveals a crucial role of Wnt5a signaling in this process. We showed that Wnt5a and its receptor Frizzled-5 (Fz5) were up-regulated in the AD mouse brain, and that beta-amyloid peptide (Aβ), a major constituent of amyloid plaques, stimulated Wnt5a and Fz5 expression in primary cortical cultures; these observations indicate that Wnt5a signaling could be aberrantly activated during AD pathogenesis. In support of such a possibility, we observed that inhibition of Wnt5a signaling attenuated while activation of Wnt5a signaling enhanced Aβ-evoked neurotoxicity, suggesting a role of Wnt5a signaling in AD-related neurodegeneration. Furthermore, we also demonstrated that Aβ-induced neurotoxicity depends on inflammatory processes, and that activation of Wnt5a signaling elicited the expression of proinflammatory cytokines IL-1β and TNF-α whereas inhibition of Wnt5a signaling attenuated the Aβ-induced expression of the cytokines in cortical cultures. Our findings collectively suggest that aberrantly up-regulated Wnt5a signaling is a crucial pathological step that contributes to AD-related neurodegeneration by regulating neuroinflammation.
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Affiliation(s)
- Bei Li
- Department of Neuroscience and Cell Biology, University of Texas Medical Branch, Galveston, Texas, United States of America
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, People's Republic of China
| | - Ling Zhong
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, People's Republic of China
| | - Xiangling Yang
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, People's Republic of China
| | - Tommy Andersson
- Department of Laboratory Medicine, Lund University, Clinical Research Centre, Skåne University Hospital, Malmö, Sweden
| | - Min Huang
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, People's Republic of China
| | - Shao-Jun Tang
- Department of Neuroscience and Cell Biology, University of Texas Medical Branch, Galveston, Texas, United States of America
- * E-mail:
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15
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Carthy JM, Garmaroudi FS, Luo Z, McManus BM. Wnt3a induces myofibroblast differentiation by upregulating TGF-β signaling through SMAD2 in a β-catenin-dependent manner. PLoS One 2011; 6:e19809. [PMID: 21611174 PMCID: PMC3097192 DOI: 10.1371/journal.pone.0019809] [Citation(s) in RCA: 123] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2010] [Accepted: 04/17/2011] [Indexed: 01/08/2023] Open
Abstract
Growing evidence suggests the Wnt family of secreted glycoproteins and their associated signaling pathways, linked to development, are recapitulated during wound repair and regeneration events. However, the role of the Wnt pathway in such settings remains unclear. In the current study, we treated mouse fibroblasts with 250 ng/mL of recombinant Wnt3a for 72 hours and examined its affect on cell morphology and function. Wnt3a induced a spindle-like morphology in fibroblasts characterized by the increased formation of stress fibres. Wnt3a decreased the proliferation of fibroblasts, but significantly increased cell migration as well as fibroblast-mediated contraction of a collagen lattice. Wnt3a significantly increased the expression of TGF-β and its associated signaling through SMAD2. Consistent with this, we observed significantly increased smooth muscle α-actin expression and incorporation of this contractile protein into stress fibres following Wnt3a treatment. Knockdown of β-catenin using siRNA reversed the Wnt3a-induced smooth muscle α-actin expression, suggesting these changes were dependent on canonical Wnt signaling through β-catenin. Neutralization of TGF-β with a blocking antibody significantly inhibited the Wnt3a-induced smooth muscle α-actin expression, indicating these changes were dependent on the increased TGF-β signaling. Collectively, this data strongly suggests Wnt3a promotes the formation of a myofibroblast-like phenotype in cultured fibroblasts, in part, by upregulating TGF-β signaling through SMAD2 in a β-catenin-dependent mechanism. As myofibroblasts are critical regulators of wound healing responses, these findings may have important implications for our understanding of normal and aberrant injury and repair events.
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Affiliation(s)
- Jon M. Carthy
- UBC James Hogg Research Centre, Institute for Heart+Lung Health, Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, Canada
| | - Farshid S. Garmaroudi
- UBC James Hogg Research Centre, Institute for Heart+Lung Health, Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, Canada
| | - Zongshu Luo
- UBC James Hogg Research Centre, Institute for Heart+Lung Health, Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, Canada
| | - Bruce M. McManus
- UBC James Hogg Research Centre, Institute for Heart+Lung Health, Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, Canada
- * E-mail:
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16
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Spence JR, Mayhew CN, Rankin SA, Kuhar M, Vallance JE, Tolle K, Hoskins EE, Kalinichenko VV, Wells SI, Zorn AM, Shroyer NF, Wells JM. Directed differentiation of human pluripotent stem cells into intestinal tissue in vitro. Nature 2011; 470:105-9. [PMID: 21151107 PMCID: PMC3033971 DOI: 10.1038/nature09691] [Citation(s) in RCA: 1296] [Impact Index Per Article: 99.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2010] [Accepted: 11/23/2010] [Indexed: 12/12/2022]
Abstract
Studies in embryonic development have guided successful efforts to direct the differentiation of human embryonic and induced pluripotent stem cells (PSCs) into specific organ cell types in vitro. For example, human PSCs have been differentiated into monolayer cultures of liver hepatocytes and pancreatic endocrine cells that have therapeutic efficacy in animal models of liver disease and diabetes, respectively. However, the generation of complex three-dimensional organ tissues in vitro remains a major challenge for translational studies. Here we establish a robust and efficient process to direct the differentiation of human PSCs into intestinal tissue in vitro using a temporal series of growth factor manipulations to mimic embryonic intestinal development. This involved activin-induced definitive endoderm formation, FGF/Wnt-induced posterior endoderm pattering, hindgut specification and morphogenesis, and a pro-intestinal culture system to promote intestinal growth, morphogenesis and cytodifferentiation. The resulting three-dimensional intestinal 'organoids' consisted of a polarized, columnar epithelium that was patterned into villus-like structures and crypt-like proliferative zones that expressed intestinal stem cell markers. The epithelium contained functional enterocytes, as well as goblet, Paneth and enteroendocrine cells. Using this culture system as a model to study human intestinal development, we identified that the combined activity of WNT3A and FGF4 is required for hindgut specification whereas FGF4 alone is sufficient to promote hindgut morphogenesis. Our data indicate that human intestinal stem cells form de novo during development. We also determined that NEUROG3, a pro-endocrine transcription factor that is mutated in enteric anendocrinosis, is both necessary and sufficient for human enteroendocrine cell development in vitro. PSC-derived human intestinal tissue should allow for unprecedented studies of human intestinal development and disease.
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Affiliation(s)
- Jason R. Spence
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039
| | - Christopher N. Mayhew
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039
| | - Scott A. Rankin
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039
| | - Matthew Kuhar
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039
| | - Jefferson E. Vallance
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039
- Division of Gastroenterology, Hepatology and Nutrition, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039
| | - Kathryn Tolle
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039
| | - Elizabeth E. Hoskins
- Division of Hematology and Oncology, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039
| | - Vladimir V. Kalinichenko
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039
- Division of Pulmonary Biology, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039
| | - Susanne I. Wells
- Division of Hematology and Oncology, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039
| | - Aaron M. Zorn
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039
| | - Noah F. Shroyer
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039
- Division of Gastroenterology, Hepatology and Nutrition, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039
| | - James M. Wells
- Division of Developmental Biology, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039
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17
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Tanigawa S, Wang H, Yang Y, Sharma N, Tarasova N, Ajima R, Yamaguchi TP, Rodriguez LG, Perantoni AO. Wnt4 induces nephronic tubules in metanephric mesenchyme by a non-canonical mechanism. Dev Biol 2011; 352:58-69. [PMID: 21256838 DOI: 10.1016/j.ydbio.2011.01.012] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2010] [Revised: 01/11/2011] [Accepted: 01/12/2011] [Indexed: 02/06/2023]
Abstract
Wnt4 and β-catenin are both required for nephrogenesis, but studies using TCF-reporter mice suggest that canonical Wnt signaling is not activated in metanephric mesenchyme (MM) during its conversion to the epithelia of the nephron. To better define the role of Wnt signaling, we treated rat metanephric mesenchymal progenitors directly with recombinant Wnt proteins. These studies revealed that Wnt4 protein, which is required for nephron formation, induces tubule formation and differentiation markers Lim1 and E-cadherin in MM cells, but does not activate a TCF reporter or up regulate expression of canonical Wnt target gene Axin-2 and has little effect on the stabilization of β-catenin or phosphorylation of disheveled-2. Furthermore, Wnt4 causes membrane localization of ZO-1 and occludin in tight junctions. To directly examine the role of β-catenin/TCF-dependent transcription, we developed synthetic cell-permeable analogs of β-catenin's helix C, which is required for transcriptional activation, in efforts to specifically inhibit canonical Wnt signaling. One inhibitor blocked TCF-dependent transcription and induced degradation of β-catenin but did not affect tubule formation and stimulated the expression of Lim1 and E-cadherin. Since a canonical mechanism appears not to be operative in tubule formation, we assessed the involvement of the non-canonical Ca(2+)-dependent pathway. Treatment of MM cells with Wnt4 induced an influx of Ca(2+) and caused phosphorylation of CaMKII. Moreover, Ionomycin, a Ca(2+)-dependent pathway activator, stimulated tubule formation. These results demonstrate that the canonical Wnt pathway is not responsible for mesenchymal-epithelial transition (MET) in nephron formation and suggest that the non-canonical calcium/Wnt pathway mediates Wnt4-induced tubulogenesis in the kidney.
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Affiliation(s)
- Shunsuke Tanigawa
- Cancer and Developmental Biology Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702-1201, USA
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18
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Natsume H, Tokuda H, Adachi S, Matsushima-Nishiwaki R, Kato K, Minamitani C, Otsuka T, Kozawa O. Wnt3a regulates tumor necrosis factor-α-stimulated interleukin-6 release in osteoblasts. Mol Cell Endocrinol 2011; 331:66-72. [PMID: 20732383 DOI: 10.1016/j.mce.2010.08.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2010] [Revised: 08/05/2010] [Accepted: 08/17/2010] [Indexed: 11/20/2022]
Abstract
It is recognized that Wnt pathways regulate bone metabolism. We have previously shown that tumor necrosis factor-α (TNF-α) stimulates synthesis of interleukin-6 (IL-6), a potent bone resorptive agent, via p44/p42 mitogen-activated protein (MAP) kinase and phosphatidylinositol 3-kinase (PI3-kinase)/Akt in osteoblast-like MC3T3-E1 cells. In the present study, we investigated the effect of Wnt3a on TNF-α-stimulated IL-6 synthesis in these cells. Wnt3a, which alone did not affect the IL-6 levels, significantly suppressed the TNF-α-stimulated IL-6 release. Lithium Chloride (LiCl), which is an inhibitor of GSK3β, markedly reduced the TNF-α-stimulated IL-6 release, similar to the results with Wnt3a. The suppression by Wnt3a or LiCl was also observed in the intracellular protein levels of IL-6 elicited by TNF-α. Wnt3a failed to affect the TNF-α-induced phosphorylation of p44/p42 MAP kinase, Akt, IκB or NFκB. Either Wnt3a or LiCl failed to reduce, rather increased the IL-6 mRNA expression stimulated by TNF-α. Lactacystin, a proteasome inhibitor, and bafilomycin A1, a lysosomal protease inhibitor, significantly restored the suppressive effect of Wnt3a on TNF-α-stimulated IL-6 release. Taken together, our results strongly suggest that Wnt3a regulates IL-6 release stimulated by TNF-α at post-transcriptional level in osteoblasts.
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Affiliation(s)
- Hideo Natsume
- Department of Orthopedic Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya 467-8601, Japan
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19
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Ohba S, Lanigan TM, Roessler BJ. Leptin receptor JAK2/STAT3 signaling modulates expression of Frizzled receptors in articular chondrocytes. Osteoarthritis Cartilage 2010; 18:1620-9. [PMID: 20868760 PMCID: PMC2997121 DOI: 10.1016/j.joca.2010.09.006] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2010] [Revised: 09/13/2010] [Accepted: 09/14/2010] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Differentiated articular chondrocytes express a functional bisoform of the leptin receptor (LRb); however, leptin-LRb signaling in these cells is poorly understood. We hypothesized that leptin-LRb signaling in articular chondrocytes functions to modulate canonical Wnt signaling events by altering the expression of Frizzled (FZD) receptors. METHODS Human chondrocyte cell lines and primary articular chondrocytes were grown in serum containing growth media for 24h, followed by a media change to Dulbecco's modified Eagle's medium (DMEM) containing 1% Nutridoma-SP to obtain a serum-deficient environment for 24h before treatment. Treatments included recombinant human leptin (10-100nM), recombinant human IL-6 (0.3-3nM), or recombinant human erythropoietin (Epo) (10mU/ml). Cells were harvested 30min-48h after treatment and whole cell lysates were analyzed using immunoblots or luciferase assays. RESULTS Treatment of cells with leptin resulted in activation of Janus kinase 2 (JAK2) and subsequent phosphorylation of specific tyrosine residues on LRb, followed by dose- and time-dependent increases in the expression of Frizzled-1 (FZD1) and Frizzled-7 (FZD7). Leptin-mediated increases in the expression of FZD1 were blocked by pre-treatment with the protein synthesis inhibitor cycloheximide or the JAK2 inhibitor AG490. Experiments using a series of hybrid Epo extracellular domain-leptin intracellular domain receptors (ELR) harboring mutations of specific tyrosine residues in the cytoplasmic tail showed that increases in the expression of FZD1 were dependent on LRb-mediated phosphorylation of STAT3, but not ERK1/2 or STAT5. Leptin pre-treatment of chondrocytes prior to Wnt3a stimulation resulted in an increased magnitude of canonical Wnt signaling. CONCLUSION These experiments show that leptin-LRb signaling in articular chondrocytes modulates expression of canonical Wnt signaling receptors and suggests that direct cross-talk between these pathways is important in determining chondrocyte homeostasis.
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Affiliation(s)
- Seigo Ohba
- Division of Rheumatology, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan 48109-5688
| | - Thomas M. Lanigan
- Division of Rheumatology, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan 48109-5688
| | - Blake J. Roessler
- Division of Rheumatology, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan 48109-5688
- To whom correspondence should be addressed: 3560 MSRB2, 1150 W. Medical Center Dr., Ann Arbor, MI 48109-5688, Tel.: 734-763-7949, Fax: 734-764-3596,
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20
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Heo JS, Lee SY, Lee JC. Wnt/β-catenin signaling enhances osteoblastogenic differentiation from human periodontal ligament fibroblasts. Mol Cells 2010; 30:449-54. [PMID: 20848229 DOI: 10.1007/s10059-010-0139-3] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2010] [Revised: 08/10/2010] [Accepted: 08/23/2010] [Indexed: 02/01/2023] Open
Abstract
Wnt/β-catenin signaling has been known to influence bone formation and homeostasis. In this study, we investigated the canonical Wnt signaling regulation of osteogenic differentiation from periodontal ligament (PDL) fibroblasts. Stimulating PDL fibroblasts with lithium chloride (LiCl), a canonical Wnt activator, significantly increased mineralized nodule and alkaline phosphatase (ALP) activity in a time- and dose-dependent manner. LiCl up-regulated protein expression of osteogenic transcription factors, including the runt-related gene 2, Msx2, and Osterix 2, in the PDL fibroblasts. Treatment of these cells with LiCl also increased the mRNA levels of ALP, FosB, and Fra1 in a dose-dependent manner. Blockage of canonical Wnt signaling by treating the cells with DKK1 inhibited Wnt1-stimulated mRNA expression of these osteogenic factors. Furthermore, pretreatment with DKK1 reduced the ALP activity and matrix mineralization stimulated by Wnt1. Collectively, these results suggest that canonical Wnt signaling leads to the differentiation of PDL fibroblasts into osteogenic lineage with the attendant stimulation of osteogenic transcription factors.
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Affiliation(s)
- Jung Sun Heo
- Department of Maxillofacial Biomedical Engineering and Institute of Oral Biology, School of Dentistry, Kyung Hee University, Seoul, 130-701, Korea
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21
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Warner DR, Mukhopadhyay P, Brock GN, Pihur V, Pisano MM, Greene RM. TGFβ-1 and Wnt-3a interact to induce unique gene expression profiles in murine embryonic palate mesenchymal cells. Reprod Toxicol 2010; 31:128-33. [PMID: 20955781 DOI: 10.1016/j.reprotox.2010.10.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2010] [Revised: 09/14/2010] [Accepted: 10/06/2010] [Indexed: 11/18/2022]
Abstract
Development of the secondary palate in mammals is a complex process under the control of numerous growth and differentiation factors that regulate key processes such as cell proliferation, synthesis of extracellular matrix molecules, and epithelial-mesenchymal transdifferentiation. Alterations in any one of these processes either through genetic mutation or environmental insult have the potential to lead to clefts of the secondary palate. Members of the TGFβ family of cytokines are crucial mediators of these processes and emerging evidence supports a pivotal role for members of the Wnt family of secreted growth and differentiation factors. Previous work in this laboratory demonstrated cross-talk between the Wnt and TGFβ signaling pathways in cultured mouse embryonic palate mesenchymal cells. In the current study we tested the hypothesis that unique gene expression profiles are induced in murine embryonic palate mesenchymal cells as a result of this cross-talk between the TGFβ and Wnt signal transduction pathways.
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Affiliation(s)
- Dennis R Warner
- University of Louisville Birth Defects Center, Department of Molecular, Cellular and Craniofacial Biology, University of Louisville, ULSD, Louisville, KY 40292, USA
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Cao L, Gibson JD, Miyamoto S, Sail V, Verma R, Rosenberg DW, Nelson CE, Giardina C. Intestinal lineage commitment of embryonic stem cells. Differentiation 2010; 81:1-10. [PMID: 20934799 DOI: 10.1016/j.diff.2010.09.182] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2010] [Revised: 09/17/2010] [Accepted: 09/22/2010] [Indexed: 01/02/2023]
Abstract
Generating lineage-committed intestinal stem cells from embryonic stem cells (ESCs) could provide a tractable experimental system for understanding intestinal differentiation pathways and may ultimately provide cells for regenerating damaged intestinal tissue. We tested a two-step differentiation procedure in which ESCs were first cultured with activin A to favor formation of definitive endoderm, and then treated with fibroblast-conditioned medium with or without Wnt3A. The definitive endoderm expressed a number of genes associated with gut-tube development through mouse embryonic day 8.5 (Sox17, Foxa2, and Gata4 expressed and Id2 silent). The intestinal stem cell marker Lgr5 gene was also activated in the endodermal cells, whereas the Msi1, Ephb2, and Dcamkl1 intestinal stem cell markers were not. Exposure of the endoderm to fibroblast-conditioned medium with Wnt3A resulted in the activation of Id2, the remaining intestinal stem cell markers and the later gut markers Cdx2, Fabp2, and Muc2. Interestingly, genes associated with distal gut-associated mesoderm (Foxf2, Hlx, and Hoxd8) were also simulated by Wnt3A. The two-step differentiation protocol generated gut bodies with crypt-like structures that included regions of Lgr5-expressing proliferating cells and regions of cell differentiation. These gut bodies also had a smooth muscle component and some underwent peristaltic movement. The ability of the definitive endoderm to differentiate into intestinal epithelium was supported by the vivo engraftment of these cells into mouse colonic mucosa. These findings demonstrate that definitive endoderm derived from ESCs can carry out intestinal cell differentiation pathways and may provide cells to restore damaged intestinal tissue.
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Affiliation(s)
- Li Cao
- University of Connecticut, Department of Molecular and Cell Biology, 91 North Eagleville Road, Unit 3125 Storrs, CT 06269-3125, USA
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An JH, Yang JY, Ahn BY, Cho SW, Jung JY, Cho HY, Cho YM, Kim SW, Park KS, Kim SY, Lee HK, Shin CS. Enhanced mitochondrial biogenesis contributes to Wnt induced osteoblastic differentiation of C3H10T1/2 cells. Bone 2010; 47:140-50. [PMID: 20399290 DOI: 10.1016/j.bone.2010.04.593] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2010] [Revised: 04/06/2010] [Accepted: 04/09/2010] [Indexed: 11/29/2022]
Abstract
Mitochondria play a key role in cell physiology including cell differentiation and proliferation. We investigated the changes of mitochondrial biogenesis during Wnt-induced osteoblastic differentiation of murine mesenchymal C3H10T1/2 cells. Scanning electron microscopy demonstrated that activation of Wnt signaling by Wnt-3A conditioned medicum (CM) resulted in significant increase in the number of mitochondria in C3H10T1/2 cells. In addition, the induction of alkaline phosphatase (ALP) activities by Wnt-3A CM was accompanied by significant increase in mitochondrial mass (p<0.05), mitochondrial membrane potential (p<0.05), intracellular reactive oxygen species production (p<0.05), resting oxygen consumption rate (p<0.05), cellular ATP content (p< or =0.05) and mtDNA copy number (p<0.05) compared to the cells with control CM (L292-CM) treatment. Moreover, co-treatment with Dkk-1 or WIF-1, both of which are Wnt inhibitors, abrogated the Wnt-3A-induced ALP activities as well as mitochondrial biogenesis markers. Upregulation of mitochondrial biogenesis by overexpression of mitochondrial transcription factor A (Tfam) significantly enhanced Wnt-induced osteogenesis as measured by ALP activities. In contrast, inhibition of mitochondrial biogenesis by treatment with Zidovudine (AZT) resulted in significant inhibition of ALP activities. Finally, ALP activities in human osteosarcoma cell line devoid of mitochondrial DNA (rho(0) cells) was significantly suppressed both in basal and Wnt-3A stimulated state compared to those from mitochondria-intact cells (rho+ cells). As a mechanism for Wnt-mediated mitochondrial biogenesis, we found that Wnt increased the expression of PGC-1alpha, a critical molecules in mitochondrial biogenesis, through Erk and p38 MAPK pathway independent of beta-catenin signaling. We also found that increased mitochondrial biogenesis is in turn positively regulating TOPflash reporter activity as well as beta-catenin levels. To summarize, mitochodrial biogenesis is upregulated by Wnt signaling and this upregulation contributes to the osteoblastic differentiation of mouse mesenchymal C3H10T1/2 cells.
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Affiliation(s)
- Jee Hyun An
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
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24
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Sonderegger S, Haslinger P, Sabri A, Leisser C, Otten JV, Fiala C, Knöfler M. Wingless (Wnt)-3A induces trophoblast migration and matrix metalloproteinase-2 secretion through canonical Wnt signaling and protein kinase B/AKT activation. Endocrinology 2010; 151:211-20. [PMID: 19887570 PMCID: PMC2974214 DOI: 10.1210/en.2009-0557] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Invasion of human trophoblasts is promoted through activation of wingless (Wnt) signaling, suggesting a role of the pathway in placental development and morphogenesis. However, details on the process such as involvement of canonical and/or noncanonical Wnt signaling cascades as well as their target genes are largely unknown. Hence, signal transduction via canonical Wnt signaling or phosphatidylinositide 3-kinase (PI3K)/AKT and their cross talk as well as trophoblast-specific protease expression were investigated in trophoblastic SGHPL-5 cells and primary extravillous trophoblasts purified from first-trimester placentas. Western blot analyses revealed that the recombinant Wnt ligand Wnt-3A increased phosphorylation of AKT and the downstream kinase glycogen synthase kinase (GSK)-3beta as well as accumulation of activated, nuclear beta-catenin. In accordance, luciferase expression of a canonical Wnt/TCF reporter and cell migration in first-trimester villous explant cultures and of SGHPL-5 cells were stimulated. Chemical inhibition of PI3K abolished Wnt-dependent phosphorylation of AKT and GSK-3beta and trophoblast motility but did not affect appearance of activated beta-catenin or Wnt/TCF reporter activity. In contrast, inhibition of the canonical pathway through soluble Dickkopf-1 did not influence AKT and GSK-3beta phosphorylation but reduced Wnt reporter activity, accumulation of active beta-catenin, and cell migration. Both inhibitors decreased Wnt-3A-induced secretion of pro- and active matrix metalloproteinase-2 from SGHPL-5 cells and pure EVT. The data suggest that Wnt-3A may activate canonical Wnt signaling and PI3K/AKT through distinct receptors. The two signaling cascades act independently in trophoblasts; however, both pathways promote Wnt-dependent migration and the release of matrix metalloproteinase-2, which has been identified as novel Wnt target in invasive trophoblasts.
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Affiliation(s)
- Stefan Sonderegger
- Department of Obstetrics and Fetal-Maternal Medicine, Reproductive Biology Unit, Medical University of Vienna, Vienna, Austria
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25
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Kunke D, Bryja V, Mygland L, Arenas E, Krauss S. Inhibition of canonical Wnt signaling promotes gliogenesis in P0-NSCs. Biochem Biophys Res Commun 2009; 386:628-33. [PMID: 19545542 DOI: 10.1016/j.bbrc.2009.06.084] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2009] [Accepted: 06/13/2009] [Indexed: 01/29/2023]
Abstract
Wnt signaling plays an essential role in the development of mammalian central nervous system. We investigated the impact of activation/inhibition of the Wnt signaling pathway on neuronal/glial differentiation in neurospheres derived from neonatal mouse forebrains. For short term alterations, neurospheres were stimulated with recombinant Wnt-3a, Wnt-5a and the Wnt inhibitor Dickkopf-1 (Dkk1). Furthermore, neurospheres were transduced with retroviral vectors encoding Wnt-3a, Wnt-7a and their inhibitors Dkk1 and soluble Frizzled related protein-5 (sFRP5). Long-term activation of Wnt pathway by Wnt-7a or by treatment with GSK3 inhibitors promoted a moderate increase of the neuronal differentiation and blocked gliogenesis. In contrast, Wnt pathway inhibition in neurospheres, induced by retroviral overexpression of either Dkk1 or sFRP5, robustly increased the gliogenesis at the expense of neurogenesis. In summary, our data demonstrate that activation or inhibition of Wnt/beta-catenin signaling in neurospheres regulates neuronal and glial differentiation, respectively. Thus, our results suggest that Wnt signaling may also contribute to regulate these processes in the neonatal brain.
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Affiliation(s)
- David Kunke
- Centre for Molecular Biology and Neuroscience and Institute of Medical Microbiology, Rikshospitalet, 0027 Oslo, Norway.
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26
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Nemoto E, Koshikawa Y, Kanaya S, Tsuchiya M, Tamura M, Somerman MJ, Shimauchi H. Wnt signaling inhibits cementoblast differentiation and promotes proliferation. Bone 2009; 44:805-12. [PMID: 19442631 DOI: 10.1016/j.bone.2008.12.029] [Citation(s) in RCA: 105] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2008] [Revised: 12/01/2008] [Accepted: 12/30/2008] [Indexed: 11/16/2022]
Abstract
Cementoblasts, tooth root lining cells, are responsible for laying down cementum on the root surface, a process that is indispensable for establishing a functional periodontal ligament. Cementoblasts share phenotypical features with osteoblasts. Wnt signaling has been implicated in increased bone formation by controlling mesenchymal stem cell or osteoblastic cell functions; however the role of Wnt signaling on cementogenesis has not been examined. In this study, we have identified a consistent expression profile of Wnt signaling molecules in cementoblasts, in vitro by RT-PCR. Exposure of cells to LiCl, which promotes canonical Wnt signaling by inhibiting GSK-3beta, increased beta-catenin nuclear translocation and up-regulated the transcriptional activity of a canonical Wnt-responsive promoters, suggesting that an endogenous canonical Wnt pathway functions in cementoblasts. Activation of endogenous canonical Wnt signaling with LiCl suppressed alkaline phosphatase (ALP) activity and expression of genes associated with cementum function; ALP, bone sialoprotein (BSP), and osteocalcin (OCN). Exposure to Wnt3a, as a representative canonical Wnt member, also inhibited the expression of ALP, BSP, and OCN gene. This effect was accompanied by decreased gene expression of Runx2 and Osterix and by increased gene expression of lymphoid enhancer factor-1. Pretreatment with Dickkopf (Dkk)-1, a potent canonical Wnt antagonist, which binds to a low-density lipoprotein-receptor-related protein (LRP)-5/6 co-receptor, attenuated the suppressive effects of Wnt3a on mRNA expression of Runx2 and OCN on cementoblasts. These findings suggest that canonical Wnt signaling inhibits cementoblast differentiation via regulation of expression of selective transcription factors. Wnt3a also increased the expression of cyclin D1, known as a cell cycle regulator, as well as cell proliferation. In conclusion, these observations suggest that Wnt signaling inhibits cementoblast differentiation and promotes cell proliferation. Elucidating the role of Wnt in controlling cementoblast function will provide new tools needed to improve on existing periodontal regeneration therapies.
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Affiliation(s)
- Eiji Nemoto
- Department of Periodontology and Endodontology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi Aoba, Sendai, Japan.
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27
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Kawaguchi-Ihara N, Murohashi I, Nara N, Tohda S. Promotion of the self-renewal capacity of human acute leukemia cells by Wnt3A. Anticancer Res 2008; 28:2701-2704. [PMID: 19035298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
BACKGROUND Wnt/beta-catenin signaling is involved in the growth of various types of cancer cells. Wnt3A has been reported to promote the self-renewal of hematopoietic stem cells. MATERIALS AND METHODS The effects of recombinant Wnt3A protein on the in vitro growth of four acute myeloid leukemia (AML) and four acute T-lymphoblastic leukemia (T-ALL) cell lines was examined. RESULTS Wnt3A stimulation either had no effect on, or slightly suppressed, the short-term growth of these cell lines. In three cell lines, Wnt3A promoted clonogenic cell recovery after suspension culture, suggesting the promotion of the self-renewal capacity of leukemic stem or progenitor cells. Immunoblot analysis showed that Wnt3A stimulation reduced phosphorylated beta-catenin and increased beta-catenin in these cells, indicating that Wnt3A stimulation activated Wnt/beta-catenin signaling. CONCLUSION Wnt3A stimulation did not promote the growth of whole cell populations, but did promote the self-renewal of leukemic stem/progenitor cells in some AML and T-ALL cell lines.
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MESH Headings
- ADP-ribosyl Cyclase 1/biosynthesis
- Acute Disease
- Antigens, CD34/biosynthesis
- Calcium-Binding Proteins/biosynthesis
- Calcium-Binding Proteins/genetics
- Cell Growth Processes/drug effects
- Cell Line, Tumor
- Gene Expression/drug effects
- Humans
- Intercellular Signaling Peptides and Proteins/biosynthesis
- Intercellular Signaling Peptides and Proteins/genetics
- Leukemia, Myeloid/drug therapy
- Leukemia, Myeloid/genetics
- Leukemia, Myeloid/metabolism
- Leukemia, Myeloid/pathology
- Membrane Proteins/biosynthesis
- Membrane Proteins/genetics
- Neoplastic Stem Cells/drug effects
- Precursor T-Cell Lymphoblastic Leukemia-Lymphoma/drug therapy
- Precursor T-Cell Lymphoblastic Leukemia-Lymphoma/genetics
- Precursor T-Cell Lymphoblastic Leukemia-Lymphoma/metabolism
- Precursor T-Cell Lymphoblastic Leukemia-Lymphoma/pathology
- RNA, Messenger/biosynthesis
- RNA, Messenger/genetics
- Receptor, Notch1/biosynthesis
- Receptor, Notch1/genetics
- Recombinant Proteins/pharmacology
- Serrate-Jagged Proteins
- Wnt Proteins/pharmacology
- Wnt3 Protein
- Wnt3A Protein
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Affiliation(s)
- Noriko Kawaguchi-Ihara
- Department of Laboratory Medicine, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo 113-8519, Japan
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28
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Yin ZS, Zhang H, Wang W, Hua XY, Hu Y, Zhang SQ, Li GW. Wnt-3a protein promote neuronal differentiation of neural stem cells derived from adult mouse spinal cord. Neurol Res 2008; 29:847-54. [PMID: 17609021 DOI: 10.1179/016164107x223539] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
BACKGROUND Wnt proteins as growth factor have multiple functions in neural development, and especially serve key roles in differentiation and development. Wnt-3a is an intercellular signaling molecule that is involved in a variety of morphogenetic events. The purpose of this study was to investigate the effects of Wnt-3a signal protein on proliferation and differentiation of neural stem cells derived from adult mouse spinal cord. METHODS Adult mouse neural stem cells were cultured with serum free incubation. The recombined plasmid pSecTag2/Hygro B-Wnt3a for eukaryotic expression transfected adult neural stem cell, then the expression protein was detected by Western blot. The differentiation of adult neural stem cells was identified by the immunocytochemical technique. RESULTS The inducing differentiated rates of neurons were improved greatly by Wnt-3a protein compared with control (p<0.05). CONCLUSION Wnt-3a has obvious influence on the neuronal differentiation of adult neural stem cell.
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Affiliation(s)
- Zong-Sheng Yin
- Department of Orthopaedics, First Affiliated Hospital of Anhui Medical University, Hefei 230032, China.
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29
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Caverzasio J, Manen D. Essential role of Wnt3a-mediated activation of mitogen-activated protein kinase p38 for the stimulation of alkaline phosphatase activity and matrix mineralization in C3H10T1/2 mesenchymal cells. Endocrinology 2007; 148:5323-30. [PMID: 17717053 DOI: 10.1210/en.2007-0520] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Signaling pathways involved in the development of osteoprogenitors induced by Wnts remain poorly understood. In this study, we investigated the role of MAPKs in the development of mesenchymal cells into osteoprogenitors. In C3H10T1/2 mesenchymal cells, Wnt3a induced a rapid and transient activation of MAPKs p38 and ERK. Dickkopf 1, a selective antagonist of Wnt proteins binding to low-density lipoprotein-receptor-related protein-5/6 did not influence activation of p38 and ERK induced by Wnt3a. A MAPK kinase-1/2 (MEK1/2) inhibitor blocked, whereas a p38 inhibitor had no effect on, Wnt3a-induced cell proliferation. In contrast, both inhibitors significantly reduced alkaline phosphatase stimulation with a more pronounced effect of the p38 inhibitor. The p38 inhibitor also blunted nodule mineralization induced by Wnt3a. Associated with these effects, beta-catenin transcriptional activity, assessed with the TOPflash system, was dose-dependently decreased by the p38 but not by the ERK inhibitor. Both the reduced alkaline phosphatase stimulation and blunting of beta-catenin transcriptional activity were mimicked by expression of dominant-negative (dn) p38 and dnMEK 3/6. Inhibition of beta-catenin transcriptional activity by the p38 inhibitor as well as by dnp38 and dnMEK 3/6 molecules were not associated with changes in cytosolic and nuclear beta-catenin levels induced by Wnt3a. In conclusion, Wnt3a activates ERK and p38 in mesenchymal C3H10T1/2 cells by a low-density lipoprotein-receptor-related protein-5/6-independent mechanism. Activation of p38 regulates alkaline phosphatase activity and nodule mineralization induced by Wnt3a probably by interacting with beta-catenin transcriptional activity. These observations suggest that MAPKs ERK and p38 are probably essential pathways activated by Wnt proteins for the development of mesenchymal cells into osteoprogenitors.
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Affiliation(s)
- Joseph Caverzasio
- Service of Bone Diseases, Department of Rehabilitation and Geriatrics, University Hospital of Geneva, CH-1211 Geneva 14, Switzerland.
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30
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Shang YC, Wang SH, Xiong F, Zhao CP, Peng FN, Feng SW, Li MS, Li Y, Zhang C. Wnt3a signaling promotes proliferation, myogenic differentiation, and migration of rat bone marrow mesenchymal stem cells. Acta Pharmacol Sin 2007; 28:1761-74. [PMID: 17959027 DOI: 10.1111/j.1745-7254.2007.00671.x] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
AIM To investigate the effects of the wingless-related MMTV integration site 3A (Wnt3a) signaling on the proliferation, migration, and the myogenic and adipogenic differentiation of rat bone marrow mesenchymal stem cells (rMSC). METHODS Primary MSC were isolated and cultured from Sprague-Dawley rats and characterized by flow cytometry. Mouse L cells were transfected with Wnt3a cDNA, and conditioned media containing active Wnt3a proteins were prepared. Cell proliferation was evaluated by cell count and 5-bromodeoxyuridine incorporation assay. The migration of rMSC was performed by using a transwell migration and wound healing assay. The myogenic and adipogenic differentiation in rMSC were examined by light microscopy, immunofluorescence, and RT-PCR at different time points after myogenic or adipogenic introduction. RESULTS Wnt3a signaling induced beta-catenin nuclear translocation and activated the Wnt pathway in rMSC. In the presence of Wnt3a, rMSC proliferated more rapidly than the control cells, keeping their differentiation potential. Moreover, Wnt3a signaling induced 2.62% and 3.76% of rMSC-expressed desmin and myosin heavy chain after being cultured in myogenic medium. The myogenic differentiation genes, including Pax7, MyoD, Myf5, Myf4, and myogenin, were activated after Wnt3a treatment. On the other hand, Wnt3a inhibited the adipogenic differentiation in rMSC through the downregulated expression of CCAAT/enhancer-binding protein alpha (C/EBPalpha) and peroxisome proliferator-activated receptor gamma (PPARgamma). Furthermore, Wnt3a promoted the migration capacity of rMSC. CONCLUSION The results indicate that Wnt3a signaling can induce myogenic differentiation in rMSC. Wnt3a signaling is also involved in the regulation of the proliferation and migration of rMSC. These results could provide a rational foundation for cell-based tissue repair in humans.
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Affiliation(s)
- Yan-chang Shang
- Department of Neurology, First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
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31
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Yuan Y, Si WK, Li ZQ, Pan J, Zhao C. [Differentiation phenotypes of k562 cells induced by exogenous wnt5a]. Zhongguo Shi Yan Xue Ye Xue Za Zhi 2007; 15:946-949. [PMID: 17956667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
This study was aimed to investigate the effect of exogenous Wnt5a on directional differentiation of K562 cells. Wnt5a and GFP condition mediums were prepared by recombinant adenoviral vector AdWnt5a and AdGFP transfecting CHO cells. K562 cells were treated with Wnt5a and the GFP condition mediums for 1 - 7 days as Wnt5a treated group and control group respectively. The morphological changes of K562 cells were observed by light microscope and electron microscope; the differentiation phenotypes of K562 cells were identified by the cytochemical staining of POX, PAS, alpha-NAE and immunocytochemistry of CD13, CD14, CD68, and the effect of Wnt5a on cell cycle distribution of K562 cells was detected by flow cytometry. The results showed that the morphology and ultrastructure of K562 cells treated by Wnt5a displayed differentiation mature feature; both POX and PAS staining showed higher positive ratio in Wnt5a treated group than that in control group; the alpha-NAE staining also was positive, but positive intensity in Wnt5a treated group could be inhibited up to 70% by NaF. The expressions of monocytic differentiation antigens of CD14, CD68 in Wnt5a treated group were higher than those in control group, but the expression differences of granulocytic differentiation antigen CD13 between Wnt5a treated group and control group were not significant. The cell cycle in treated group was blocked at G2 phase as compared with control group. It is concluded that exogenous Wnt5a can induce K562 cells to differentiate towards mature and K562 cells treated with Wnt5a displays features of differentiation towards monocytic lineage.
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Affiliation(s)
- Yuan Yuan
- Department of Clinical Hematology, Faculty of Medical Laboratory Examination, The Third Military Medical University, Chongqing 400038, China
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32
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Klapholz-Brown Z, Walmsley GG, Nusse YM, Nusse R, Brown PO. Transcriptional program induced by Wnt protein in human fibroblasts suggests mechanisms for cell cooperativity in defining tissue microenvironments. PLoS One 2007; 2:e945. [PMID: 17895986 PMCID: PMC1976560 DOI: 10.1371/journal.pone.0000945] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2007] [Accepted: 09/02/2007] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND The Wnt signaling system plays key roles in development, regulation of stem cell self-renewal and differentiation, cell polarity, morphogenesis and cancer. Given the multifaceted roles of Wnt signaling in these processes, its transcriptional effects on the stromal cells that make up the scaffold and infrastructure of epithelial tissues are of great interest. METHODS AND RESULTS To begin to investigate these effects, we used DNA microarrays to identify transcriptional targets of the Wnt pathway in human lung fibroblasts. Cells were treated with active Wnt3a protein in culture, and RNA was harvested at 4 hours and 24 hours. Nuclear accumulation of ss-Catenin, as shown by immunofluorescence, and induction of AXIN2 demonstrate that fibroblasts are programmed to respond to extracellular Wnt signals. In addition to several known Wnt targets, we found many new Wnt induced genes, including many transcripts encoding regulatory proteins. Transcription factors with important developmental roles, including HOX genes, dominated the early transcriptional response. Furthermore, we found differential expression of several genes that play direct roles in the Wnt signaling pathway, as well as genes involved in other cell signaling pathways including fibroblast growth factor (FGF) and bone morphogenetic protein (BMP) signaling. The gene most highly induced by Wnt3a was GREMLIN2, which encodes a secreted BMP antagonist. CONCLUSIONS Elevated expression of GREMLIN2 suggests a new role for Wnt signals in the maintenance of stem cell niches, whereby Wnt signals induce nearby fibroblasts to produce a BMP antagonist, inhibiting differentiation and promoting expansion of stem cells in their microenvironment. We suggest that Wnt-induced changes in the gene expression program of local stromal cells may play an important role in the establishment of specialized niches hospitable to the self-renewal of normal or malignant epithelial stem cells in vivo.
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Affiliation(s)
- Zach Klapholz-Brown
- Department of Biochemistry, Stanford University School of Medicine, Stanford, California, USA.
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33
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Tang LY, Deng N, Wang LS, Dai J, Wang ZL, Jiang XS, Li SJ, Li L, Sheng QH, Wu DQ, Li L, Zeng R. Quantitative phosphoproteome profiling of Wnt3a-mediated signaling network: indicating the involvement of ribonucleoside-diphosphate reductase M2 subunit phosphorylation at residue serine 20 in canonical Wnt signal transduction. Mol Cell Proteomics 2007; 6:1952-67. [PMID: 17693683 DOI: 10.1074/mcp.m700120-mcp200] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The complexity of canonical Wnt signaling comes not only from the numerous components but also from multiple post-translational modifications. Protein phosphorylation is one of the most common modifications that propagates signals from extracellular stimuli to downstream effectors. To investigate the global phosphorylation regulation and uncover novel phosphoproteins at the early stages of canonical Wnt signaling, HEK293 cells were metabolically labeled with two stable isotopic forms of lysine and were stimulated for 0, 1, or 30 min with purified Wnt3a. After phosphoprotein enrichment and LC-MS/MS analysis, 1057 proteins were identified in all three time points. In total 287 proteins showed a 1.5-fold or greater change in at least one time point. In addition to many known Wnt signaling transducers, other phosphoproteins were identified and quantitated, implicating their involvement in canonical Wnt signaling. k-Means clustering analysis showed dynamic patterns for the differential phosphoproteins. Profile pattern and interaction network analysis of the differential phosphoproteins implicated the possible roles for those unreported components in Wnt signaling. Moreover 100 unique phosphorylation sites were identified, and 54 of them were quantitated in the three time points. Site-specific phosphopeptide quantitation revealed that Ser-20 phosphorylation on RRM2 increased upon 30-min Wnt3a stimulation. Further studies with mutagenesis, the Wnt reporter gene assay, and RNA interference indicated that RRM2 functioned downstream of beta-catenin as an inhibitor of Wnt signaling and that Ser-20 phosphorylation of RRM2 counteracted its inhibition effect. Our systematic profiling of dynamic phosphorylation changes responding to Wnt3a stimulation not only presented a comprehensive phosphorylation network regulated by canonical Wnt signaling but also found novel molecules and phosphorylation involved in Wnt signaling.
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Affiliation(s)
- Liu-Ya Tang
- State Key Laboratory of Molecular Biology, Shangai 200031, China
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34
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Davidson KC, Jamshidi P, Daly R, Hearn MTW, Pera MF, Dottori M. Wnt3a regulates survival, expansion, and maintenance of neural progenitors derived from human embryonic stem cells. Mol Cell Neurosci 2007; 36:408-15. [PMID: 17822920 DOI: 10.1016/j.mcn.2007.07.013] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2007] [Revised: 05/28/2007] [Accepted: 07/30/2007] [Indexed: 11/18/2022] Open
Abstract
Many reports describe the efficient derivation and expansion of neural progenitors (NP) from human embryonic stem cells (hESC). However, little is known about the signaling factors found within the neurosphere microenvironment that regulate NP maintenance and differentiation. We show that Wnt ligand and receptor transcripts are endogenously upregulated within neurospheres derived from noggin-primed hESC. In addition, neurosphere formation and size were significantly greater in the presence of exogenous Wnt3a compared to control conditions. Inhibition of endogenous Wnt signaling resulted in a significant reduction in the efficiency of neurosphere formation and overall size, due to effects on both NP proliferation and apoptosis. These findings demonstrate a requirement of Wnt signaling for maintenance, proliferation, and survival of NP when cultured in neurosphere conditions.
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Affiliation(s)
- Kathryn C Davidson
- Monash Institute of Medical Research, Monash University, The Australian Stem Cell Center, Clayton, Australia
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Aoyama K, Delaney C, Varnum-Finney B, Kohn AD, Moon RT, Bernstein ID. The interaction of the Wnt and Notch pathways modulates natural killer versus T cell differentiation. Stem Cells 2007; 25:2488-97. [PMID: 17641244 DOI: 10.1634/stemcells.2007-0102] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The Wnt and Notch signaling pathways have been independently shown to play a critical role in regulating hematopoietic cell fate decisions. We previously reported that induction of Notch signaling in human CD34(+)CD38(-) cord blood cells by culture with the Notch ligand Delta 1 resulted in more cells with T or natural killer (NK) lymphoid precursor phenotype. Here, we show that addition of Wnt3a to Delta 1 further increased the percentage of CD34(-)CD7(+) and CD34(-)CD7(+)cyCD3(+) cells with increased expression of CD3 epsilon and preT alpha. In contrast, culture with Wnt3a alone did not increase generation of CD34(-)CD7(+) precursors or expression of CD3 epsilon or preT alpha gene. Furthermore, Wnt3a increased the amount of activated Notch1, suggesting that Wnt modulates Notch signaling by affecting Notch protein levels. In contrast, addition of a Wnt signaling inhibitor to Delta 1 increased the percentage of CD56(+) NK cells. Overall, these results demonstrate that regulation of Notch signaling by the Wnt pathway plays a critical role in differentiation of precursors along the early T or NK differentiation pathways. Disclosure of potential conflicts of interest is found at the end of this article.
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Affiliation(s)
- Keisuke Aoyama
- Clinical Research Division, Fred Hutchinson Cancer Research Center, 1100 Fairview Ave. N., D2-373, Seattle, Washington 98109, USA
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36
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Abstract
Human genetic studies have firmly established a link between bone mass in humans and gain-of-function or loss-of-function mutations in a Wnt coreceptor, low-density lipoprotein receptor-related protein 5 (LRP5), or in the Wnt antagonist sclerostin, and several molecular genetic studies in mice have consistently confirmed the critical importance of the Wnt signaling pathway in skeletal biology and disease. In what may be a novel paradigm, the ubiquitous nature of LRP5/6 and Wnt signaling is counterbalanced by the bone-restricted and regulated expression of Wnt antagonists such as sclerostin and Dickkopf-1 (Dkk1) in adult tissues, offering new and potentially safe therapeutic means of intervention to stimulate bone formation.
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Affiliation(s)
- Roland Baron
- Yale University School of Medicine, New Haven, CT 06520-8044, USA.
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37
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Myung SJ, Yoon JH, Gwak GY, Kim W, Lee JH, Kim KM, Shin CS, Jang JJ, Lee SH, Lee SM, Lee HS. Wnt signaling enhances the activation and survival of human hepatic stellate cells. FEBS Lett 2007; 581:2954-8. [PMID: 17544413 DOI: 10.1016/j.febslet.2007.05.050] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2007] [Revised: 05/09/2007] [Accepted: 05/18/2007] [Indexed: 01/17/2023]
Abstract
Wnt signaling was implicated in pulmonary and renal fibrosis. Since Wnt activity is enhanced in liver cirrhosis, Wnt signaling may also participate in hepatic fibrogenesis. Thus, we determined if Wnt signaling modulates hepatic stellate cell (HSC) activation and survival. Wnt3A treatment significantly activated human HSCs, while this was inhibited in secreted frizzled-related protein 1 (sFRP1) overexpressing cells. Wnt3A treatment significantly suppressed TRAIL-induced apoptosis in control HSCs versus sFRP1 over-expressing cells. Particularly, caspase 3 was more activated in sFRP1 over-expressing cells following TRAIL and Wnt3A treatment. These observations imply that Wnt signaling promotes hepatic fibrosis by enhancing HSC activation and survival.
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Affiliation(s)
- Sun Jung Myung
- Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
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38
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Kim J, You L, Xu Z, Kuchenbecker K, Raz D, He B, Jablons D. Wnt inhibitory factor inhibits lung cancer cell growth. J Thorac Cardiovasc Surg 2007; 133:733-7. [PMID: 17320573 DOI: 10.1016/j.jtcvs.2006.09.053] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2006] [Revised: 09/15/2006] [Accepted: 09/29/2006] [Indexed: 10/23/2022]
Abstract
OBJECTIVE Aberrant activation of the Wnt signaling pathway is associated with the pathogenesis of multiple cancers, including non-small cell lung cancer. Wnt inhibitory factor, a secreted Wnt antagonist, is downregulated in non-small cell lung cancer. We hypothesized that restoration of Wnt inhibitory factor function would inhibit lung cancer cell growth. METHODS The lung cancer cell lines A549 and H460 were transfected with an expression vector containing the Wnt inhibitory factor gene. Apoptosis rates and colony formation were measured after transfection. Recombinant Wnt inhibitory factor protein was used to treat H460 cells, and proliferation rates were measured with an MTS assay. Finally, Wnt inhibitory factor plasmid was peritumorally injected near H460 tumor xenografts in nude mice. RESULTS Wnt inhibitory factor-transfected cells had increased apoptosis and decreased colony formation than control cells. Recombinant human Wnt inhibitory factor protein was also able to inhibit H460 cell proliferation measured by using the MTS assay. Wnt inhibitory factor plasmid significantly inhibited the growth in vivo of H460 tumor xenografts in nude mice. CONCLUSION These data suggest that Wnt inhibitory factor is able to inhibit lung cancer cell growth both in vitro and in vivo and provides additional evidence that Wnt inhibitory factor plays an important role in Wnt pathway regulation in lung cancer.
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Affiliation(s)
- Jae Kim
- Thoracic Oncology Laboratory, UCSF Comprehensive Cancer Center, San Francisco, Calif 94143, USA
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39
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Kim SE, Choi KY. EGF receptor is involved in WNT3a-mediated proliferation and motility of NIH3T3 cells via ERK pathway activation. Cell Signal 2007; 19:1554-64. [PMID: 17374561 DOI: 10.1016/j.cellsig.2007.02.003] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2006] [Revised: 02/06/2007] [Accepted: 02/06/2007] [Indexed: 11/24/2022]
Abstract
WNT3a stimulates proliferation of NIH3T3 cells via activation of the extracellular signal-regulated kinase (ERK) pathway. The RAF-1-->MEK-->ERK cascade was immediately increased by WNT3a treatment, however, the upstream event triggering ERK pathway activation by WNT3a is not clear. WNT3a activated RAS and WNT3a-induced ERK activation was blocked by dominant-negative RAS, indicating that WNT3a might act upstream of RAS. WNT3a-induced ERK pathway activations were blocked by AG1478, the epidermal growth factor receptor (EGFR) inhibitor, and EGFR siRNA. The WNT3a-induced ERK pathway activation was not observed in fibroblasts retaining defective EGFR, but the WNT3a effect was restored by EGFR reconstitution. These results indicate involvement of EGFR in the WNT3a-induced ERK pathway activation. WNT3a-induced motility and cytoskeletal rearrangement as well as proliferation of NIH3T3 cells were blocked by AG1478 and EGFR siRNA or abolished in EGFR knock-out fibroblasts, indicating involvement of EGFR in those cellular processes. WNT3a-induced ERK pathway activation was not affected by Dickkoff-1 (DKK-1), although WNT3a-induced activations of the WNT/beta-catenin pathway and proliferation were reduced by DKK-1. EGFR is involved in WNT3a-induced proliferation via both routes dependent on and independent of the WNT/beta-catenin pathway. These results indicate that WNT3a stimulates proliferation and motility of NIH3T3 fibroblasts via EGFR-mediated ERK pathway activation.
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Affiliation(s)
- Sung-Eun Kim
- National Research Laboratory of Molecular Complex Control, Department of Biotechnology, Yonsei University, Seoul 120-749, South Korea
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40
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Yu A, Rual JF, Tamai K, Harada Y, Vidal M, He X, Kirchhausen T. Association of Dishevelled with the clathrin AP-2 adaptor is required for Frizzled endocytosis and planar cell polarity signaling. Dev Cell 2007; 12:129-41. [PMID: 17199046 PMCID: PMC2831292 DOI: 10.1016/j.devcel.2006.10.015] [Citation(s) in RCA: 142] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2006] [Revised: 09/08/2006] [Accepted: 10/19/2006] [Indexed: 11/21/2022]
Abstract
Upon activation by Wnt, the Frizzled receptor is internalized in a process that requires the recruitment of Dishevelled. We describe a novel interaction between Dishevelled2 (Dvl2) and micro2-adaptin, a subunit of the clathrin adaptor AP-2; this interaction is required to engage activated Frizzled4 with the endocytic machinery and for its internalization. The interaction of Dvl2 with AP-2 requires simultaneous association of the DEP domain and a peptide YHEL motif within Dvl2 with the C terminus of micro2. Dvl2 mutants in the YHEL motif fail to associate with micro2 and AP-2, and prevent Frizzled4 internalization. Corresponding Xenopus Dishevelled mutants show compromised ability to interfere with gastrulation mediated by the planar cell polarity (PCP) pathway. Conversely, a Dvl2 mutant in its DEP domain impaired in PCP signaling exhibits defective AP-2 interaction and prevents the internalization of Frizzled4. We suggest that the direct interaction of Dvl2 with AP-2 is important for Frizzled internalization and Frizzled/PCP signaling.
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Affiliation(s)
- Anan Yu
- Department of Cell Biology and the CBR Institute for Biomedical Research, Children’s Hospital Boston, Harvard Medical School, Boston, MA 02115, USA
| | - Jean-François Rual
- Center for Cancer Systems Biology and Department of Cancer Biology, Dana-Farber Cancer Institute and Department of Genetics, Children’s Hospital Boston, Harvard Medical School, Boston, MA 02115, USA
| | - Keiko Tamai
- Program of Neurobiology, Children’s Hospital Boston, Harvard Medical School, Boston, MA 02115, USA
| | - Yuko Harada
- Program of Neurobiology, Children’s Hospital Boston, Harvard Medical School, Boston, MA 02115, USA
| | - Marc Vidal
- Center for Cancer Systems Biology and Department of Cancer Biology, Dana-Farber Cancer Institute and Department of Genetics, Children’s Hospital Boston, Harvard Medical School, Boston, MA 02115, USA
| | - Xi He
- Program of Neurobiology, Children’s Hospital Boston, Harvard Medical School, Boston, MA 02115, USA
| | - Tomas Kirchhausen
- Department of Cell Biology and the CBR Institute for Biomedical Research, Children’s Hospital Boston, Harvard Medical School, Boston, MA 02115, USA
- Correspondence:
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Abstract
Blood vessel growth is critical for embryonic development and contributes to pathologies including cancer and diabetic retinopathy. A growing body of evidence suggests that signaling via the Wnt/beta-catenin pathway contributes to angiogenesis, and that paracrine Wnt signaling might alter endothelial cell function. To test the hypothesis that Wnt signaling promotes endothelial cell proliferation and vessel growth, we treated bovine aortic endothelial cells with Wnt1, Wnt2 and Wnt5a derived from coculture with Wnt-expressing fibroblasts. Endothelial cells cultured in the presence of Wnt1 displayed increased Wnt/beta-catenin signaling, proliferation and capillary stability in vitro. Wnt5a, which primarily signals via an alternate Wnt pathway, the Wnt/Ca(++) pathway, decreased both cell number and capillary length. Wnt2, which in other cell types activates the Wnt/beta-catenin pathway, did not activate signaling, affect cell number or increase capillary length. These results suggest that Wnt/beta-catenin and Wnt/Ca(++) signals might have opposing effects on angiogenesis.
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Affiliation(s)
- Anne M Goodwin
- The Schepens Eye Research Institute and the Department of Ophthalmology, Harvard Medical School, 20 Staniford Street, Boston, MA 02114, USA
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42
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Bryja V, Schulte G, Rawal N, Grahn A, Arenas E. Wnt-5a induces Dishevelled phosphorylation and dopaminergic differentiation via a CK1-dependent mechanism. J Cell Sci 2007; 120:586-95. [PMID: 17244647 DOI: 10.1242/jcs.03368] [Citation(s) in RCA: 146] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Previously, we have shown that Wnt-5a strongly regulates dopaminergic neuron differentiation by inducing phosphorylation of Dishevelled (Dvl). Here, we identify additional components of the Wnt-5a-Dvl pathway in dopaminergic cells. Using in vitro gain-of-function and loss-of-function approaches, we reveal that casein kinase 1 (CK1) delta and CK1epsilon are crucial for Dvl phosphorylation by non-canonical Wnts. We show that in response to Wnt-5a, CK1epsilon binds Dvl and is subsequently phosphorylated. Moreover, in response to Wnt-5a or CK1epsilon, the distribution of Dvl changed from punctate to an even appearance within the cytoplasm. The opposite effect was induced by a CK1epsilon kinase-dead mutant or by CK1 inhibitors. As expected, Wnt-5a blocked the Wnt-3a-induced activation of beta-catenin. However, both Wnt-3a and Wnt-5a activated Dvl2 by a CK1-dependent mechanism in a cooperative manner. Finally, we show that CK1 kinase activity is necessary for Wnt-5a-induced differentiation of primary dopaminergic precursors. Thus, our data identify CK1 as a component of Wnt-5a-induced signalling machinery that regulates dopaminergic differentiation, and suggest that CK1delta/epsilon-mediated phosphorylation of Dvl is a common step in both canonical and non-canonical Wnt signalling.
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Affiliation(s)
- Vítezslav Bryja
- Laboratory of Molecular Neurobiology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 77 Stockholm, Sweden
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Abstract
Human embryonic stem cells (hESC) demonstrate a remarkable proliferative and developmental potential and thus have huge therapeutic potential. To direct the differentiation of hESC to a specific lineage of high purity for cell transplantation is highly desirable. Here we describe a modified in vitro procedure to direct differentiation of three clonal hESC lines, hES 3.1, hES 3.2 and hES 3.3 efficiently to spinal motor neurons by using various differentiation factors namely retinoic acid (RA), sonic hedgehog (Shh), bone morphogenetic protein-2 (BMP-2) and Wnt3A. The highest number of motor neurons (58.0 +/- 7.6%) were obtained by an early treatment of embryoid bodies with a combination of RA + Shh from all the clonal hESC lines combined. The hES 3.1 line, however, produced relatively more motor neurons (69.5 +/- 11.8%) compared to other two hES clones, 3.2 (52.4 +/- 13.1%) and 3.3 (52.3 +/- 15.5%). Immunolocalisation studies revealed the expression of neuronal specific marker, beta omega-tubulin and motor neuron specific marker, HB9/HLXB9 in all the three hESC clones after 45 days of differentiation. The RT-PCR analyses showed the presence of the neuron-specific genes. This modified differentiation protocol provides a mean of obtaining an enriched population of motor neurons from hESC for possible use in studies of lineage development, drug discovery and also as a potential cell therapy for motor neuron disease.
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Affiliation(s)
- U-Ming Lim
- Stem Cell Division, Diabetes Transplant Unit, Prince of Wales Hospital and University of New South Wale, Australia
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44
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Nygren MK, Døsen G, Hystad ME, Stubberud H, Funderud S, Rian E. Wnt3A activates canonical Wnt signalling in acute lymphoblastic leukaemia (ALL) cells and inhibits the proliferation of B-ALL cell lines. Br J Haematol 2006; 136:400-13. [PMID: 17156404 DOI: 10.1111/j.1365-2141.2006.06442.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Acute lymphoblastic leukaemia (ALL) is the most common malignancy in children. Recently, there has been a growing interest in Wnt signalling in several aspects of cellular development, including cancer formation. Little is known about Wnt signalling in B-ALL. We investigated whether activation of canonical Wnt signalling could occur in B-ALL cells and thereby play a potential role in cellular growth and/or survival. This study found that Wnt3A induced beta-catenin accumulation in both primary B-ALL cells and B-ALL leukaemia cell lines. Further, Wnt3A was shown to induce nuclear translocation of beta-catenin and TCF/Lef-1 dependent transcriptions in the B-ALL cell line Nalm-6. Examination of the mRNA expression pattern of WNT ligands, FZD receptors and WNT antagonists in Nalm-6 cells identified a set of ligands and receptors available for signalling, as well as antagonists potentially available for modulating the response. Functional analyses showed that Wnt3A inhibited the proliferation of several, but not all, B-ALL cell lines studied. Finally, microarray analysis was used to identify several Wnt3A target genes involved in a diverse range of cellular activities, which are potential mediators of the Wnt3A-restrained proliferation.
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Affiliation(s)
- Marit Kveine Nygren
- Department of Immunology, Institute for Cancer Research, The University Clinic Rikshospitalet-Radiumhospitalet HF, Montebello, Oslo, Norway
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45
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Nishita M, Yoo SK, Nomachi A, Kani S, Sougawa N, Ohta Y, Takada S, Kikuchi A, Minami Y. Filopodia formation mediated by receptor tyrosine kinase Ror2 is required for Wnt5a-induced cell migration. ACTA ACUST UNITED AC 2006; 175:555-62. [PMID: 17101698 PMCID: PMC2064592 DOI: 10.1083/jcb.200607127] [Citation(s) in RCA: 168] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The receptor tyrosine kinase Ror2 plays important roles in developmental morphogenesis. It has recently been shown that Ror2 mediates Wnt5a-induced noncanonical Wnt signaling by activating the Wnt–JNK pathway and inhibiting the β-catenin–TCF pathway. However, the function of Ror2 in noncanonical Wnt signaling leading to cell migration is largely unknown. We show, using genetically different or manipulated cultured cells, that Ror2 is critical for Wnt5a-induced, but not Wnt3a-induced, cell migration. Ror2-mediated cell migration requires the extracellular cysteine-rich domain (CRD), which is the binding site for Wnt5a, and the cytoplasmic proline-rich domain (PRD) of Ror2. Furthermore, Ror2 can mediate filopodia formation via actin reorganization, irrespective of Wnt5a, and this Ror2-mediated filopodia formation requires the actin-binding protein filamin A, which associates with the PRD of Ror2. Intriguingly, disruption of filopodia formation by suppressing the expression of either Ror2 or filamin A inhibits Wnt5a-induced cell migration, indicating that Ror2-mediated filopodia formation is essential for Wnt5a-induced cell migration.
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Affiliation(s)
- Michiru Nishita
- Department of Genome Sciences, Faculty of Medical Sciences, Graduate School of Medicine, Kobe University, 7-5-1, Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan
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46
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Bryja V, Schulte G, Arenas E. Wnt-3a utilizes a novel low dose and rapid pathway that does not require casein kinase 1-mediated phosphorylation of Dvl to activate beta-catenin. Cell Signal 2006; 19:610-6. [PMID: 17027228 DOI: 10.1016/j.cellsig.2006.08.011] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2006] [Revised: 08/21/2006] [Accepted: 08/21/2006] [Indexed: 12/23/2022]
Abstract
The current view of canonical Wnt signalling is that following Wnt binding to its receptors (Frizzled-Lrp5/6), dishevelled (Dvl) becomes hyperphosphorylated, and the signal is transduced to the APC-GSK3beta-axin-beta-catenin multiprotein complex, which subsequently dissociates. As a result beta-catenin is not phosphorylated, escapes proteosomal degradation and activates its target genes after translocation to the nucleus. Here, we analyzed the importance of the Wnt-3a-induced phosphorylation and shift in electrophoretic migration of Dvl (PS-Dvl) for the activation of beta-catenin. Analysis of Wnt-3a time- and dose-responses in a dopaminergic cell line showed that beta-catenin is activated rapidly (within minutes) and at a low dose of Wnt-3a (1 ng/ml). Surprisingly, PS-Dvl appeared only after 30 min and at greater doses (> or =20 ng/ml) of Wnt-3a. Moreover, we found that a casein kinase 1 inhibitor (D4476) or siRNA for casein kinase 1 delta/epsilon (CK1delta/epsilon) blocked the Wnt-3a-induced PS-Dvl. Interestingly, CK1 inhibition or siRNA for CK1delta/epsilon did not ablate the activation of beta-catenin by Wnt-3a, indicating that there is a PS-Dvl-independent path to activate beta-catenin. The increase in beta-catenin activation by Wnt-3a (PS-Dvl-dependent or -independent) were blocked by Dickkopf1 (Dkk1), suggesting that the effect of Wnt-3a is in both cases mediated by Lrp5/6 receptors. Thus, our results show that Wnt-3a rapidly induce a partial activation of beta-catenin in the absence of PS-Dvl at low doses, while at high doses induce a full activation of beta-catenin in a PS-Dvl-dependent manner.
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Affiliation(s)
- Vítezslav Bryja
- Karolinska Institutet, Department Medical Biochemistry and Biophysics, Laboratory Molecular Neurobiology, S-171 77 Stockholm, Sweden
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47
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Kim SE, Lee WJ, Choi KY. The PI3 kinase-Akt pathway mediates Wnt3a-induced proliferation. Cell Signal 2006; 19:511-8. [PMID: 17011750 DOI: 10.1016/j.cellsig.2006.08.008] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2006] [Revised: 07/18/2006] [Accepted: 08/14/2006] [Indexed: 12/01/2022]
Abstract
Wnt3a activates proliferation of fibroblasts cells via activation of both extracellular signal-regulated kinase (ERK) and Wnt/beta-catenin signaling pathways. In this study, we show that the phosphatidyl inositol 3 kinases (PI3K)-Akt pathway is also involved in the Wnt3a-induced proliferation. Akt was activated within 30 min by Wnt3a in NIH3T3 cells. By Wnt3a treatment, activated Akt was transiently accumulated in nucleus although beta-catenin was accumulated in the nucleus of cells in a prolonged manner. The Wnt3a-induced Akt activation was not affected by siRNA-mediated reduction of beta-catenin, indicating that Wnt3a-induced Akt activation may occur independently of beta-catenin. The Wnt3a-induced Akt activation was abolished by pre-treatment with PI3K inhibitor, LY294002 and Wortmanin, but not by MEK inhibitor, U0126, indicating that Wnt3a activates Akt via PI3K. The growth and proliferation induced by Wnt3a were blocked by treatments of the PI3K inhibitors. Furthermore, Wnt3a-induced proliferation was blocked by Akt siRNA. These results reveal that the PI3K-Akt pathway mediates the Wnt3a-induced growth and proliferation of NIH3T3 cells.
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Affiliation(s)
- Sung-Eun Kim
- Department of Biotechnology, National Research Laboratory of Molecular Complex Control, Seoul, South Korea
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48
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Hasegawa K, Fujioka T, Nakamura Y, Nakatsuji N, Suemori H. A method for the selection of human embryonic stem cell sublines with high replating efficiency after single-cell dissociation. Stem Cells 2006; 24:2649-60. [PMID: 16931777 DOI: 10.1634/stemcells.2005-0657] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Human embryonic stem cells (hESCs) exhibit pluripotency and indefinite proliferation and are a potential source of cells for transplantation therapies and drug discovery. These applications will require large amounts of hESCs. However, hESCs are difficult to culture and maintain at larger scales, in part because of their low resistance to dissociation during passaging. To circumvent this, we developed a simple and easy method for establishing hESC sublines tolerant of complete dissociation. These cells exhibit high replating efficiency and also high cloning efficiency, and they maintain their ability to differentiate into the three germ layers. Several sublines have no detectable abnormalities in their karyotypes, and they retained their characteristics under feeder-free culture conditions and after freeze-thawing. Thus, these hESC sublines would be valuable for hESC applications.
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Affiliation(s)
- Kouichi Hasegawa
- Laboratory of Embryonic Stem Cell Research, Stem Cell Research Center, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
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49
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Døsen G, Tenstad E, Nygren MK, Stubberud H, Funderud S, Rian E. Wnt expression and canonical Wnt signaling in human bone marrow B lymphopoiesis. BMC Immunol 2006; 7:13. [PMID: 16808837 PMCID: PMC1543656 DOI: 10.1186/1471-2172-7-13] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2005] [Accepted: 06/29/2006] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND The early B lymphopoiesis in mammals is regulated through close interactions with stromal cells and components of the intracellular matrix in the bone marrow (BM) microenvironment. Although B lymphopoiesis has been studied for decades, the factors that are implicated in this process, both autocrine and paracrine, are inadequately explored. Wnt signaling is known to be involved in embryonic development and growth regulation of tissues and cancer. Wnt molecules are produced in the BM, and we here ask whether canonical Wnt signaling has a role in regulating human BM B lymphopoiesis. RESULTS Examination of the mRNA expression pattern of Wnt ligands, Fzd receptors and Wnt antagonists revealed that BM B progenitor cells and stromal cells express a set of ligands and receptors available for induction of Wnt signaling as well as antagonists for fine tuning of this signaling. Furthermore, different B progenitor maturation stages showed differential expression of Wnt receptors and co-receptors, beta-catenin, plakoglobin, LEF-1 and TCF-4 mRNAs, suggesting canonical Wnt signaling as a regulator of early B lymphopoiesis. Exogenous Wnt3A induced stabilization and nuclear accumulation of beta-catenin in primary lineage restricted B progenitor cells. Also, Wnt3A inhibited B lymphopoiesis of CD133+CD10- hematopoietic progenitor cells and CD10+ B progenitor cells in coculture assays using a supportive layer of stromal cells. This effect was blocked by the Wnt antagonists sFRP1 or Dkk1. Examination of early events in the coculture showed that Wnt3A inhibits cell division of B progenitor cells. CONCLUSION These results indicate that canonical Wnt signaling is involved in human BM B lymphopoiesis where it acts as a negative regulator of cell proliferation in a direct or stroma dependent manner.
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Affiliation(s)
- Guri Døsen
- Department of Immunology, Institute for Cancer Research, Rikshospitalet-Radiumhospitalet Medical Center, Medical Faculty, University of Oslo, Norway
| | - Ellen Tenstad
- Department of Immunology, Institute for Cancer Research, Rikshospitalet-Radiumhospitalet Medical Center, Medical Faculty, University of Oslo, Norway
| | - Marit Kveine Nygren
- Department of Immunology, Institute for Cancer Research, Rikshospitalet-Radiumhospitalet Medical Center, Medical Faculty, University of Oslo, Norway
| | - Heidi Stubberud
- Department of Immunology, Institute for Cancer Research, Rikshospitalet-Radiumhospitalet Medical Center, Medical Faculty, University of Oslo, Norway
| | - Steinar Funderud
- Department of Immunology, Institute for Cancer Research, Rikshospitalet-Radiumhospitalet Medical Center, Medical Faculty, University of Oslo, Norway
| | - Edith Rian
- Department of Immunology, Institute for Cancer Research, Rikshospitalet-Radiumhospitalet Medical Center, Medical Faculty, University of Oslo, Norway
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50
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Abstract
Secreted frizzled related proteins (Sfrps) are extracellular attenuators of Wnt signaling that play important roles in both embryogenesis and oncogenesis. Although Sfrps are generally thought to bind and sequester Wnts away from active receptor complexes, very little is known about the specificity of Sfrp family members for various Wnts. In the developing chick neural tube, sfrp-1, 2, and 3 transcripts are expressed in and adjacent to the dorsal neural tube, where Wnt-1 and Wnt-3a are expressed. To better define the possible roles of Sfrp-1, 2, and 3 in the neural tube, we first tested the ability of purified Sfrps to inhibit Wnt-3a-induced accumulation of beta-catenin in L cells. We find that both Sfrp-1 and Sfrp-2 can inhibit Wnt-3a activity while Sfrp-3 cannot. To determine where Sfrp-1 and Sfrp-2 impinge on the Wnt signaling pathway, we tested the ability of these Sfrps to inhibit Wnt signaling induced by the addition of LiCl, an inhibitor of GSK-3. Sfrp-1 and Sfrp-2 are unable to inhibit the accumulation of beta-catenin in LiCl-treated cells, suggesting that the ability of Sfrps to inhibit the accumulation of beta-catenin is GSK-3 dependent. We have further shown that Sfrp-2 inhibits the ability of ectopic Wnt-3a to stimulate proliferation in the developing chick neural tube. These results provide the framework for understanding how Sfrps function to regulate Wnt-3a activity in developing embryos and in cancer.
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Affiliation(s)
- Lisa M Galli
- Department of Biology, San Francisco State University, San Francisco, California 94132, USA
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