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Liang D, Hu H, Li S, Dong J, Wang X, Wang Y, He L, He Z, Gao Y, Gao SJ, Lan K. Oncogenic herpesvirus KSHV Hijacks BMP-Smad1-Id signaling to promote tumorigenesis. PLoS Pathog 2014; 10:e1004253. [PMID: 25010525 PMCID: PMC4092152 DOI: 10.1371/journal.ppat.1004253] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Accepted: 05/29/2014] [Indexed: 12/22/2022] Open
Abstract
Kaposi's sarcoma-associated herpesvirus (KSHV) is the etiological agent of Kaposi's sarcoma (KS), a malignancy commonly found in AIDS patients. Whether KS is a true neoplasm or hyperplasia has been a subject of intensive debate until recently when KSHV is unequivocally shown to efficiently infect, immortalize and transform rat primary mesenchymal precursor cells (MM). Moreover, KSHV-transformed MM cells (KMM) efficiently induce tumors with hallmark features of KS when inoculated into nude mice. Here, we showed Smad1 as a novel binding protein of KSHV latency-associated nuclear antigen (LANA). LANA interacted with and sustained BMP-activated p-Smad1 in the nucleus and enhanced its loading on the Id promoters. As a result, Ids were significantly up-regulated in KMM cells and abundantly expressed in human KS lesions. Strikingly, genetic and chemical inhibition of the BMP-Smad1-Id pathway blocked the oncogenic phenotype of KSHV-transformed cells in vitro and in vivo. These findings illustrate a novel mechanism by which a tumor virus hijacks and converts a developmental pathway into an indispensable oncogenic pathway for tumorigenesis. Importantly, our results demonstrate the efficacy of targeting the BMP-Smad1-Id pathway for inhibiting the growth of KSHV-induced tumors, and therefore identify the BMP pathway as a promising therapeutic target for KS. Although KSHV exerts multiple mechanisms to promote cell survival by repressing TGF-β signaling, little is known whether KSHV manipulates BMP signaling and contributes to the pathogenesis of KSHV-induced malignancies. In the present study, we have identified Smad1 as a novel binding protein of LANA by tandem affinity purification. We demonstrated that LANA up-regulated Id transcription through BMP-Smad1-Id signaling pathway. Id proteins were significantly up-regulated in KSHV-transformed MM (KMM) cells, and were abundantly expressed in human KS lesions; therefore, they were probably relevant to the development of KS. Importantly, we have shown that Ids are required to maintain the oncogenic phenotype of KMM cells in vitro and in vivo. These findings illustrate a novel mechanism by which a tumor virus hijacks and converts a developmental pathway into an indispensable oncogenic pathway for tumorigenesis. Furthermore, we showed that BMP signaling inhibitors dramatically hampered the tumorigenicity of KMM cells in vitro and in vivo. Our results demonstrate that small inhibitors targeting BMP-Smad1-Id signaling pathway are promising candidates for the treatment of KS.
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Affiliation(s)
- Deguang Liang
- Key Laboratory of Molecular Virology and Immunology, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, China
| | - Hao Hu
- Key Laboratory of Molecular Virology and Immunology, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, China
| | - Shasha Li
- Key Laboratory of Molecular Virology and Immunology, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, China
| | - Jiazhen Dong
- Key Laboratory of Molecular Virology and Immunology, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, China
| | - Xing Wang
- Key Laboratory of Molecular Virology and Immunology, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, China
| | - Yuhan Wang
- Key Laboratory of Molecular Virology and Immunology, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, China
| | - Li He
- Key Laboratory of Molecular Virology and Immunology, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, China
| | - Zhiheng He
- Key Laboratory of Molecular Virology and Immunology, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, China
| | - Yuan Gao
- Key Laboratory of Molecular Virology and Immunology, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, China
| | - Shou-Jiang Gao
- Department of Molecular Microbiology and Immunology, Keck School of Medicine, University of Southern California, Los Angeles, California, United States of America
- * E-mail: (SJG); (KL)
| | - Ke Lan
- Key Laboratory of Molecular Virology and Immunology, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, China
- * E-mail: (SJG); (KL)
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152
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Sun X, Kim YH, Phan TN, Yang BS. Topical application of ALK5 inhibitor A-83-01 reduces burn wound contraction in rats by suppressing myofibroblast population. Biosci Biotechnol Biochem 2014; 78:1805-12. [PMID: 25351330 DOI: 10.1080/09168451.2014.932666] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Burn scar contracture that follows the healing of deep dermal burns causes severe deformation and functional impairment. However, its current therapeutic interventions are limited with unsatisfactory outcomes. When we treated deep second-degree burns in rat skin with activin-like kinase 5 (ALK5) inhibitor A-83-01, it reduced wound contraction and enhanced the area of re-epithelialization so that the overall time for wound closing was not altered. In addition, it reduced myofibroblast population in the dermis of burn scar with a diminished deposition of its biomarker proteins such as α-SMA and collagen. Treatment of rat dermal fibroblast with A-83-01 inhibited transforming growth factor-β1 (TGF-β1)-dependent induction of α-SMA and collagen type I. Taken together, these results suggest that topical application of ALK5 inhibitor A-83-01 could be effective in preventing the contraction of burn wound without delaying the wound closure by virtue of its inhibitory activity against the TGF-β-induced increase of myofibroblast population.
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Affiliation(s)
- Xiaoyan Sun
- a Chemical Kinomics Research Center , Korea Institute of Science and Technology , Seoul , Korea
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153
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Inhibition of BMP signaling suppresses metastasis in mammary cancer. Oncogene 2014; 34:2437-49. [PMID: 24998846 PMCID: PMC4689138 DOI: 10.1038/onc.2014.189] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Revised: 05/22/2014] [Accepted: 05/28/2014] [Indexed: 12/12/2022]
Abstract
Bone Morphogenetic Proteins (BMPs) are secreted cytokines/growth factors that play differing roles in cancer. BMPs are overexpressed in human breast cancers, but loss of BMP signaling in mammary carcinomas can accelerate metastasis. We show that human breast cancers display active BMP signaling, which is rarely downregulated or homozygously deleted. We hypothesized that systemic inhibition of BMP signaling in both the tumor and the surrounding microenvironment could prevent tumor progression and metastasis. To test this hypothesis, we used DMH1, a BMP antagonist, in MMTV.PyVmT expressing mice. Treatment with DMH1 reduced lung metastasis and the tumors were less proliferative and more apoptotic. In the surrounding tumor microenvironment, treatment with DMH1 altered fibroblasts, lymphatic vessels and macrophages to be less tumor promoting. These results indicate that inhibition of BMP signaling may successfully target both the tumor and the surrounding microenvironment to reduce tumor burden and metastasis.
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154
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Xu S, Wei J, Wang F, Kong LY, Ling XY, Nduom E, Gabrusiewicz K, Doucette T, Yang Y, Yaghi NK, Fajt V, Levine JM, Qiao W, Li XG, Lang FF, Rao G, Fuller GN, Calin GA, Heimberger AB. Effect of miR-142-3p on the M2 macrophage and therapeutic efficacy against murine glioblastoma. J Natl Cancer Inst 2014; 106:dju162. [PMID: 24974128 DOI: 10.1093/jnci/dju162] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND The immune therapeutic potential of microRNAs (miRNAs) in the context of tumor-mediated immune suppression has not been previously described for monocyte-derived glioma-associated macrophages, which are the largest infiltrating immune cell population in glioblastomas and facilitate gliomagenesis. METHODS An miRNA microarray was used to compare expression profiles between human glioblastoma-infiltrating macrophages and matched peripheral monocytes. The effects of miR-142-3p on phenotype and function of proinflammatory M1 and immunosuppressive M2 macrophages were determined. The therapeutic effect of miR-142-3p was ascertained in immune-competent C57BL/6J mice harboring intracerebral GL261 gliomas and in genetically engineered Ntv-a mice bearing high-grade gliomas. Student t test was used to evaluate the differences between ex vivo datasets. Survival was analyzed with the log-rank test and tumor sizes with linear mixed models and F test. All statistical tests were two-sided. RESULTS miR-142-3p was the most downregulated miRNA (approximately 4.95-fold) in glioblastoma-infiltrating macrophages. M2 macrophages had lower miR-142-3p expression relative to M1 macrophages (P = .03). Overexpression of miR-142-3p in M2 macrophages induced selective modulation of transforming growth factor beta receptor 1, which led to subsequent preferential apoptosis in the M2 subset (P = .01). In vivo miR-142-3p administration resulted in glioma growth inhibition (P = .03, n = 5) and extended median survival (miR-142-3p-treated C57BL/6J mice vs scramble control: 31 days vs 23.5 days, P = .03, n = 10; miR-142-3p treated Ntv-a mice vs scramble control: 32 days vs 24 days, P = .03, n = 9), with an associated decrease in infiltrating macrophages (R (2) = .303). CONCLUSIONS These data indicate a unique role of miR-142-3p in glioma immunity by modulating M2 macrophages through the transforming growth factor beta signaling pathway.
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Affiliation(s)
- Shuo Xu
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF)
| | - Jun Wei
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF)
| | - Fei Wang
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF)
| | - Ling-Yuan Kong
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF)
| | - Xiao-Yang Ling
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF)
| | - Edjah Nduom
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF)
| | - Konrad Gabrusiewicz
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF)
| | - Tiffany Doucette
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF)
| | - Yuhui Yang
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF)
| | - Nasser K Yaghi
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF)
| | - Virginia Fajt
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF)
| | - Jonathan M Levine
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF)
| | - Wei Qiao
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF)
| | - Xin-Gang Li
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF)
| | - Frederick F Lang
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF)
| | - Ganesh Rao
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF)
| | - Gregory N Fuller
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF)
| | - George A Calin
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF)
| | - Amy B Heimberger
- Affiliations of authors: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, China (SX, X-GL), Department of Neurosurgery (SX, JW, FW, L-YK, X-YL, EN, KG, TD, YY, FFL, GR, ABH), Department of Biostatistics (WQ), Department of Pathology (GNF), and Department of Experimental Therapeutics (GAC), University of Texas M. D. Anderson Cancer Center, Houston, TX; Baylor College of Medicine, Houston, TX (NKY); Texas A&M University College of Veterinary Medicine & Biomedical Sciences, College Station, TX (VF).
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155
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Peterson AJ, O'Connor MB. Strategies for exploring TGF-β signaling in Drosophila. Methods 2014; 68:183-93. [PMID: 24680699 PMCID: PMC4057889 DOI: 10.1016/j.ymeth.2014.03.016] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Revised: 03/14/2014] [Accepted: 03/17/2014] [Indexed: 02/06/2023] Open
Abstract
The TGF-β pathway is an evolutionarily conserved signal transduction module that mediates diverse biological processes in animals. In Drosophila, both the BMP and Activin branches are required for viability. Studies rooted in classical and molecular genetic approaches continue to uncover new developmental roles for TGF-β signaling. We present an overview of the secreted ligands, transmembrane receptors and cellular Smad transducer proteins that compose the core pathway in Drosophila. An assortment of tools have been developed to conduct tissue-specific loss- and gain-of-function experiments for these pathway components. We discuss the deployment of these reagents, with an emphasis on appropriate usage and limitations of the available tools. Throughout, we note reagents that are in need of further improvement or development, and signaling features requiring further study. A general theme is that comparison of phenotypes for ligands, receptors, and Smads can be used to map tissue interactions, and to separate canonical and non-canonical signaling activities. Core TGF-β signaling components are subject to multiple layers of regulation, and are coupled to context-specific inputs and outputs. In addition to fleshing out how TGF-β signaling serves the fruit fly, we anticipate that future studies will uncover new regulatory nodes and modes and will continue to advance paradigms for how TGF-β signaling regulates general developmental processes.
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Affiliation(s)
- Aidan J Peterson
- Department of Genetics, Cell Biology & Development, 6-160 Jackson Hall, 321 Church St SE, University of Minnesota, Minneapolis, MN 55455, United States
| | - Michael B O'Connor
- Department of Genetics, Cell Biology & Development, 6-160 Jackson Hall, 321 Church St SE, University of Minnesota, Minneapolis, MN 55455, United States.
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156
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Chen L, Coleman R, Leang R, Tran H, Kopf A, Walsh CM, Sears-Kraxberger I, Steward O, Macklin WB, Loring JF, Lane TE. Human neural precursor cells promote neurologic recovery in a viral model of multiple sclerosis. Stem Cell Reports 2014; 2:825-37. [PMID: 24936469 PMCID: PMC4050357 DOI: 10.1016/j.stemcr.2014.04.005] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Revised: 04/04/2014] [Accepted: 04/07/2014] [Indexed: 12/21/2022] Open
Abstract
Using a viral model of the demyelinating disease multiple sclerosis (MS), we show that intraspinal transplantation of human embryonic stem cell-derived neural precursor cells (hNPCs) results in sustained clinical recovery, although hNPCs were not detectable beyond day 8 posttransplantation. Improved motor skills were associated with a reduction in neuroinflammation, decreased demyelination, and enhanced remyelination. Evidence indicates that the reduced neuroinflammation is correlated with an increased number of CD4+CD25+FOXP3+ regulatory T cells (Tregs) within the spinal cords. Coculture of hNPCs with activated T cells resulted in reduced T cell proliferation and increased Treg numbers. The hNPCs acted, in part, through secretion of TGF-β1 and TGF-β2. These findings indicate that the transient presence of hNPCs transplanted in an animal model of MS has powerful immunomodulatory effects and mediates recovery. Further investigation of the restorative effects of hNPC transplantation may aid in the development of clinically relevant MS treatments. Spinal cord transplantation of hNPCs results in recovery in a viral model of MS hNPC-mediated recovery occurs in the absence of engrafted cells hNPCs are immunomodulatory through increasing the frequency of Tregs in the CNS hNPCs increase Treg frequency via a TGF-β1- and TGF-β2-dependent pathway
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Affiliation(s)
- Lu Chen
- Department of Molecular Biology and Biochemistry, Sue and Bill Gross Stem Cell Center, Multiple Sclerosis Research Center, University of California, Irvine, Irvine, CA 92697, USA
| | - Ronald Coleman
- Center for Regenerative Medicine, Department of Chemical Physiology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Ronika Leang
- Department of Molecular Biology and Biochemistry, Sue and Bill Gross Stem Cell Center, Multiple Sclerosis Research Center, University of California, Irvine, Irvine, CA 92697, USA
| | - Ha Tran
- Center for Regenerative Medicine, Department of Chemical Physiology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Alexandra Kopf
- Department of Molecular Biology and Biochemistry, Sue and Bill Gross Stem Cell Center, Multiple Sclerosis Research Center, University of California, Irvine, Irvine, CA 92697, USA
| | - Craig M Walsh
- Department of Molecular Biology and Biochemistry, Sue and Bill Gross Stem Cell Center, Multiple Sclerosis Research Center, University of California, Irvine, Irvine, CA 92697, USA
| | - Ilse Sears-Kraxberger
- Reeve-Irvine Research Center, University of California, Irvine, Irvine, CA 92697, USA
| | - Oswald Steward
- Reeve-Irvine Research Center, Departments of Anatomy & Neurobiology, Neurobiology & Behavior, and Neurosurgery, School of Medicine, University of California, Irvine, Irvine, CA 92697, USA
| | - Wendy B Macklin
- Department of Cell and Developmental Biology, School of Medicine, University of Colorado, Aurora, CO 80045, USA
| | - Jeanne F Loring
- Center for Regenerative Medicine, Department of Chemical Physiology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Thomas E Lane
- Department of Molecular Biology and Biochemistry, Sue and Bill Gross Stem Cell Center, Multiple Sclerosis Research Center, University of California, Irvine, Irvine, CA 92697, USA
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157
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Wang Y, Ho CC, Bang E, Rejon CA, Libasci V, Pertchenko P, Hébert TE, Bernard DJ. Bone morphogenetic protein 2 stimulates noncanonical SMAD2/3 signaling via the BMP type 1A receptor in gonadotrope-like cells: implications for FSH synthesis. Endocrinology 2014; 155:1970-81. [PMID: 24601881 DOI: 10.1210/en.2013-1741] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
FSH is an essential regulator of mammalian reproduction. Its synthesis by pituitary gonadotrope cells is regulated by multiple endocrine and paracrine factors, including TGFβ superfamily ligands, such as the activins and inhibins. Activins stimulate FSH synthesis via transcriptional regulation of its β-subunit gene (Fshb). More recently, bone morphogenetic proteins (BMPs) were shown to stimulate murine Fshb transcription alone and in synergy with activins. BMP2 signals via its canonical type I receptor, BMPR1A (or activin receptor-like kinase 3 [ALK3]), and SMAD1 and SMAD5 to stimulate transcription of inhibitor of DNA binding proteins. Inhibitor of DNA binding proteins then potentiate the actions of activin-stimulated SMAD3 to regulate the Fshb gene in the gonadotrope-like LβT2 cell line. Here, we report the unexpected observation that BMP2 also stimulates the SMAD2/3 pathway in these cells and that it does so directly via ALK3. Indeed, this novel, noncanonical ALK3 activity is completely independent of ALK4, ALK5, and ALK7, the type I receptors most often associated with SMAD2/3 pathway activation. Induction of the SMAD2/3 pathway by ALK3 is dependent upon its own previous activation by associated type II receptors, which phosphorylate conserved serine and threonine residues in the ALK3 juxtamembrane glycine-serine-rich domain. ALK3 signaling via SMAD3 is necessary for the receptor to stimulate Fshb transcription, whereas its activation of the SMAD1/5/8 pathway alone is insufficient. These data challenge current dogma that ALK3 and other BMP type I receptors signal via SMAD1, SMAD5, and SMAD8 and not SMAD2 or SMAD3. Moreover, they suggest that BMPs and activins may use similar intracellular signaling mechanisms to activate the murine Fshb promoter in immortalized gonadotrope-like cells.
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MESH Headings
- Activins/antagonists & inhibitors
- Activins/metabolism
- Animals
- Bone Morphogenetic Protein 2/agonists
- Bone Morphogenetic Protein 2/antagonists & inhibitors
- Bone Morphogenetic Protein 2/genetics
- Bone Morphogenetic Protein 2/metabolism
- Bone Morphogenetic Protein Receptors, Type I/agonists
- Bone Morphogenetic Protein Receptors, Type I/antagonists & inhibitors
- Bone Morphogenetic Protein Receptors, Type I/genetics
- Bone Morphogenetic Protein Receptors, Type I/metabolism
- Cell Line
- Follicle Stimulating Hormone, beta Subunit/biosynthesis
- Follicle Stimulating Hormone, beta Subunit/genetics
- Follicle Stimulating Hormone, beta Subunit/metabolism
- Gene Silencing
- Genes, Reporter
- Gonadotrophs/metabolism
- Humans
- Mice
- Phosphorylation
- Protein Processing, Post-Translational
- RNA, Small Interfering
- Recombinant Proteins/chemistry
- Recombinant Proteins/metabolism
- Signal Transduction
- Smad2 Protein/antagonists & inhibitors
- Smad2 Protein/genetics
- Smad2 Protein/metabolism
- Smad3 Protein/antagonists & inhibitors
- Smad3 Protein/genetics
- Smad3 Protein/metabolism
- Transcription, Genetic
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Affiliation(s)
- Ying Wang
- Departments of Pharmacology and Therapeutics (Y.W., C.C.H., E.B., C.A.R., V.L., P.P., T.E.H., D.J.B.), Oncology (C.A.R.), Obstetrics and Gynecology (D.J.B.), and Anatomy and Cell Biology (D.J.B.), McGill University, Montréal, Québec, Canada H3G 1Y6
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158
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Poli M, Asperti M, Ruzzenenti P, Regoni M, Arosio P. Hepcidin antagonists for potential treatments of disorders with hepcidin excess. Front Pharmacol 2014; 5:86. [PMID: 24808863 PMCID: PMC4009444 DOI: 10.3389/fphar.2014.00086] [Citation(s) in RCA: 91] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Accepted: 04/07/2014] [Indexed: 12/20/2022] Open
Abstract
The discovery of hepcidin clarified the basic mechanism of the control of systemic iron homeostasis. Hepcidin is mainly produced by the liver as a propeptide and processed by furin into the mature active peptide. Hepcidin binds ferroportin, the only cellular iron exporter, causing the internalization and degradation of both. Thus hepcidin blocks iron export from the key cells for dietary iron absorption (enterocytes), recycling of hemoglobin iron (the macrophages) and the release of storage iron from hepatocytes, resulting in the reduction of systemic iron availability. The BMP/HJV/SMAD pathway is the major regulator of hepcidin expression that responds to iron status. Also inflammation stimulates hepcidin via the IL6/STAT3 pathway with a support of an active BMP/HJV/SMAD pathway. In some pathological conditions hepcidin level is inadequately elevated and reduces iron availability in the body, resulting in anemia. These conditions occur in the genetic iron refractory iron deficiency anemia and the common anemia of chronic disease (ACD) or anemia of inflammation. Currently, there is no definite treatment for ACD. Erythropoiesis-stimulating agents and intravenous iron have been proposed in some cases but they are scarcely effective and may have adverse effects. Alternative approaches aimed to a pharmacological control of hepcidin expression have been attempted, targeting different regulatory steps. They include hepcidin sequestering agents (antibodies, anticalins, and aptamers), inhibitors of BMP/SMAD or of IL6/STAT3 pathway or of hepcidin transduction (siRNA/shRNA) or ferroportin stabilizers. In this review we summarized the biochemical interactions of the proteins involved in the BMP/HJV/SMAD pathway and its natural inhibitors, the murine and rat models with high hepcidin levels currently available and finally the progresses in the development of hepcidin antagonists, with particular attention to the role of heparins and heparin sulfate proteoglycans in hepcidin expression and modulation of the BMP6/SMAD pathway.
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Affiliation(s)
- Maura Poli
- Molecular Biology Laboratory, Department of Molecular and Translational Medicine, University of Brescia Brescia, Italy
| | - Michela Asperti
- Molecular Biology Laboratory, Department of Molecular and Translational Medicine, University of Brescia Brescia, Italy
| | - Paola Ruzzenenti
- Molecular Biology Laboratory, Department of Molecular and Translational Medicine, University of Brescia Brescia, Italy
| | - Maria Regoni
- Molecular Biology Laboratory, Department of Molecular and Translational Medicine, University of Brescia Brescia, Italy
| | - Paolo Arosio
- Molecular Biology Laboratory, Department of Molecular and Translational Medicine, University of Brescia Brescia, Italy
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159
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Nassar K, Grisanti S, Tura A, Lüke J, Lüke M, Soliman M, Grisanti S. A TGF-β receptor 1 inhibitor for prevention of proliferative vitreoretinopathy. Exp Eye Res 2014; 123:72-86. [PMID: 24742493 DOI: 10.1016/j.exer.2014.04.006] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Revised: 03/01/2014] [Accepted: 04/03/2014] [Indexed: 02/06/2023]
Abstract
This study evaluates the use of the TGF-β receptor 1 inhibitor LY-364947 (LY) to prevent proliferative vitreoretinopathy (PVR). For the in vitro experiments Human Tenon's Fibroblasts (HTFs) and retinal pigment epithelial (RPE) cells were treated with different concentrations of LY to determine HTF proliferation and RPE transdifferentiation. For in vivo testing 30 rabbits underwent a PVR trauma model. The animals received different concentrations of intravitreally injected LY, with or without vitrectomy. LY treatment reduced HTF proliferation and RPE transdifferentiation in vitro. In vivo intravitreal injection of LY prevented PVR development significantly. This positive effect was also present when LY injection was combined with vitrectomy. Intravitreal injection of LY prevented tractional retinal detachment in 14 out of 15 animals. In conclusion, treatment with the TGF-β receptor 1 inhibitor LY reduces HTF proliferation and RPE transdifferentiation in vitro and prevents proliferative vitreoretinopathy and subsequent tractional retinal detachment in vivo.
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Affiliation(s)
- Khaled Nassar
- University of Luebeck, Department of Ophthalmology, Ratzeburger Allee 160, D-23538 Luebeck, Germany; Fayoum University, Department of Ophthalmology, 63514 Fayoum, Egypt.
| | - Swaantje Grisanti
- University of Luebeck, Department of Ophthalmology, Ratzeburger Allee 160, D-23538 Luebeck, Germany
| | - Aysegul Tura
- University of Luebeck, Department of Ophthalmology, Ratzeburger Allee 160, D-23538 Luebeck, Germany
| | - Julia Lüke
- University of Luebeck, Department of Ophthalmology, Ratzeburger Allee 160, D-23538 Luebeck, Germany
| | - Matthias Lüke
- University of Luebeck, Department of Ophthalmology, Ratzeburger Allee 160, D-23538 Luebeck, Germany
| | - Mahmoud Soliman
- Cairo University, Department of Ophthalmology, 11956 Cairo, Egypt
| | - Salvatore Grisanti
- University of Luebeck, Department of Ophthalmology, Ratzeburger Allee 160, D-23538 Luebeck, Germany
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160
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Targeting TGF-β Signaling by Antisense Oligonucleotide-mediated Knockdown of TGF-β Type I Receptor. MOLECULAR THERAPY. NUCLEIC ACIDS 2014; 3:e156. [PMID: 24691207 PMCID: PMC4011125 DOI: 10.1038/mtna.2014.7] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Accepted: 02/06/2014] [Indexed: 11/17/2022]
Abstract
Duchenne muscular dystrophy (DMD) is caused by lack of functional dystrophin and results in progressive myofiber damage and degeneration. In addition, impaired muscle regeneration and fibrosis contribute to the progressive pathology of DMD. Importantly, transforming growth factor-β (TGF-β) is implicated in DMD pathology and is known to stimulate fibrosis and inhibit muscle regeneration. In this study, we present a new strategy to target TGF-β signaling cascades by specifically inhibiting the expression of TGF-β type I receptor TGFBR1 (ALK5). Antisense oligonucleotides (AONs) were designed to specifically induce exon skipping of mouse ALK5 transcripts. AON-induced exon skipping of ALK5 resulted in specific downregulation of full-length receptor transcripts in vitro in different cell types, repression of TGF-β activity, and enhanced C2C12 myoblast differentiation. To determine the effect of these AONs in dystrophic muscles, we performed intramuscular injections of ALK5 AONs in mdx mice, which resulted in a decrease in expression of fibrosis-related genes and upregulation of Myog expression compared to control AON-injected muscles. In summary, our study presents a novel method to target TGF-β signaling cascades with potential beneficial effects for DMD.
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161
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Vogt J, Dingwell KS, Herhaus L, Gourlay R, Macartney T, Campbell D, Smith JC, Sapkota GP. Protein associated with SMAD1 (PAWS1/FAM83G) is a substrate for type I bone morphogenetic protein receptors and modulates bone morphogenetic protein signalling. Open Biol 2014; 4:130210. [PMID: 24554596 PMCID: PMC3938053 DOI: 10.1098/rsob.130210] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Bone morphogenetic proteins (BMPs) control multiple cellular processes in embryos and adult tissues. BMPs signal through the activation of type I BMP receptor kinases, which then phosphorylate SMADs 1/5/8. In the canonical pathway, this triggers the association of these SMADs with SMAD4 and their translocation to the nucleus, where they regulate gene expression. BMPs can also signal independently of SMAD4, but this pathway is poorly understood. Here, we report the discovery and characterization of PAWS1/FAM83G as a novel SMAD1 interactor. PAWS1 forms a complex with SMAD1 in a SMAD4-independent manner, and BMP signalling induces the phosphorylation of PAWS1 through BMPR1A. The phosphorylation of PAWS1 in response to BMP is essential for activation of the SMAD4-independent BMP target genes NEDD9 and ASNS. Our findings identify PAWS1 as the first non-SMAD substrate for type I BMP receptor kinases and as a novel player in the BMP pathway. We also demonstrate that PAWS1 regulates the expression of several non-BMP target genes, suggesting roles for PAWS1 beyond the BMP pathway.
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Affiliation(s)
- Janis Vogt
- MRC Protein Phosphorylation and Ubiquitylation Unit, University of Dundee, Dow St., Dundee DD1 5EH, UK
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162
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Wang YW, Liou NH, Cherng JH, Chang SJ, Ma KH, Fu E, Liu JC, Dai NT. siRNA-targeting transforming growth factor-β type I receptor reduces wound scarring and extracellular matrix deposition of scar tissue. J Invest Dermatol 2014; 134:2016-2025. [PMID: 24670383 DOI: 10.1038/jid.2014.84] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Revised: 01/09/2014] [Accepted: 01/21/2014] [Indexed: 02/06/2023]
Abstract
Hypertrophic scarring is related to persistent activation of transforming growth factor-β (TGF-β)/Smad signaling. In the TGF-β/Smad signaling cascade, the TGF-β type I receptor (TGFBRI) phosphorylates Smad proteins to induce fibroblast proliferation and extracellular matrix deposition. In this study, we inhibited TGFBRI gene expression via TGFBRI small interfering RNA (siRNA) to reduce fibroblast proliferation and extracellular matrix deposition. Our results demonstrate that downregulating TGFBRI expression in cultured human hypertrophic scar fibroblasts significantly suppressed cell proliferation and reduced type I collagen, type III collagen, fibronectin, and connective tissue growth factor (CTGF) mRNA, and type I collagen and fibronectin protein expression. In addition, we applied TGFBRI siRNA to wound granulation tissue in a rabbit model of hypertrophic scarring. Downregulating TGFBRI expression reduced wound scarring, the extracellular matrix deposition of scar tissue, and decreased CTGF and α-smooth muscle actin mRNA expression in vivo. These results suggest that TGFBRI siRNA could be applied clinically to prevent hypertrophic scarring.
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Affiliation(s)
- Yi-Wen Wang
- Graduate Institute of Medical Sciences, National Defense Medical Center, Taipei City, Taiwan, Republic of China; Burn Center, Tri-Service General Hospital, Taipei City, Taiwan, Republic of China
| | - Nien-Hsien Liou
- Department of Biology and Anatomy, National Defense Medical Center, Taipei City, Taiwan, Republic of China
| | - Juin-Hong Cherng
- School of Dentistry, National Defense Medical Center, Taipei City, Taiwan, Republic of China
| | - Shu-Jen Chang
- Department of Dentistry, National Yang-Ming University, Taipei City, Taiwan, Republic of China
| | - Kuo-Hsing Ma
- Department of Biology and Anatomy, National Defense Medical Center, Taipei City, Taiwan, Republic of China
| | - Earl Fu
- School of Dentistry, National Defense Medical Center, Taipei City, Taiwan, Republic of China
| | - Jiang-Chuan Liu
- Department of Biology and Anatomy, National Defense Medical Center, Taipei City, Taiwan, Republic of China
| | - Niann-Tzyy Dai
- Department of Plastic and Reconstructive Surgery, Tri-Service General Hospital, Taipei City, Taiwan, Republic of China.
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163
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Mourabit S, Moles MW, Smith E, van Aerle R, Kudoh T. Bmp suppression in mangrove killifish embryos causes a split in the body axis. PLoS One 2014; 9:e84786. [PMID: 24497921 PMCID: PMC3907431 DOI: 10.1371/journal.pone.0084786] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Accepted: 11/19/2013] [Indexed: 11/25/2022] Open
Abstract
Bone morphogenetic proteins (Bmp) are major players in the formation of the vertebrate body plan due to their crucial role in patterning of the dorsal-ventral (DV) axis. Despite the highly conserved nature of Bmp signalling in vertebrates, the consequences of changing this pathway can be species-specific. Here, we report that Bmp plays an important role in epiboly, yolk syncytial layer (YSL) movements, and anterior-posterior (AP) axis formation in embryos of the self-fertilizing mangrove killifish, Kryptolebias marmoratus. Stage and dose specific exposures of embryos to the Bmp inhibitor dorsomorphin (DM) produced three distinctive morphologies, with the most extreme condition creating the splitbody phenotype, characterised by an extremely short AP axis where the neural tube, somites, and notochord were bilaterally split. In addition, parts of caudal neural tissues were separated from the main body and formed cell islands in the posterior region of the embryo. This splitbody phenotype, which has not been reported in other animals, shows that modification of Bmp may lead to significantly different consequences during development in other vertebrate species.
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Affiliation(s)
- Sulayman Mourabit
- Biosciences, College of Life & Environmental Sciences, University of Exeter, Exeter, United Kingdom
| | - Michael W. Moles
- Biosciences, College of Life & Environmental Sciences, University of Exeter, Exeter, United Kingdom
| | - Emma Smith
- Biosciences, College of Life & Environmental Sciences, University of Exeter, Exeter, United Kingdom
| | - Ronny van Aerle
- Biosciences, College of Life & Environmental Sciences, University of Exeter, Exeter, United Kingdom
| | - Tetsuhiro Kudoh
- Biosciences, College of Life & Environmental Sciences, University of Exeter, Exeter, United Kingdom
- * E-mail:
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164
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Karkampouna S, Kruithof BP, Kloen P, Obdeijn MC, van der Laan AM, Tanke HJ, Kemaladewi DU, Hoogaars WM, 't Hoen PA, Aartsma-Rus A, Clark IM, Ten Dijke P, Goumans MJ, Kruithof-de Julio M. Novel Ex Vivo Culture Method for the Study of Dupuytren's Disease: Effects of TGFβ Type 1 Receptor Modulation by Antisense Oligonucleotides. MOLECULAR THERAPY-NUCLEIC ACIDS 2014; 3:e142. [PMID: 24448195 PMCID: PMC3912325 DOI: 10.1038/mtna.2013.69] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Accepted: 11/02/2013] [Indexed: 11/26/2022]
Abstract
Dupuytren's disease (DD) is a benign fibroproliferative disease of the hand. It is characterized by the excessive production of extracellular matrix (ECM) proteins, which form a strong fibrous tissue between the handpalm and fingers, permanently disrupting the fine movement ability. The major contractile element in DD is the myofibroblast (MFB). This cell has both fibroblast and smooth muscle cell-type characteristics and causes pathological collagen deposition. MFBs generate contractile forces that are transmitted to the surrounding collagen matrix. Μajor profibrotic factors are members of the transforming growth factor-β (TGFβ) pathway which directly regulate the expression levels of several fibrous proteins such as collagen type 1, type 3, and α-smooth muscle actin. Molecular modulation of this signaling pathway could serve as a therapeutic approach. We, therefore, have developed an ex vivo “clinical trial” system to study the properties of intact, patient-derived resection specimens. In these culture conditions, Dupuytren's tissue retains its three-dimensional (3D) structure and viability. As a novel antifibrotic therapeutic approach, we targeted TGFβ type 1 receptor (also termed activin receptor-like kinase 5) expression in cultured Dupuytren's specimens by antisense oligonucleotide-mediated exon skipping. Antisense oligonucleotides targeting activin receptor-like kinase 5 showed specific reduction of ECM and potential for clinical application.
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Affiliation(s)
- Sofia Karkampouna
- Department of Molecular Cell Biology, Cancer Genomics Centre and Centre for Biomedical Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Boudewijn Pt Kruithof
- Department of Molecular Cell Biology, Cancer Genomics Centre and Centre for Biomedical Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Peter Kloen
- Department of Orthopedic Surgery, Academic Medical Center, Amsterdam, The Netherlands
| | - Miryam C Obdeijn
- Department of Plastic, Reconstructive, and Handsurgery, Academic Medical Center, Amsterdam, The Netherlands
| | - Annelies Ma van der Laan
- Department of Molecular Cell Biology, Cancer Genomics Centre and Centre for Biomedical Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Hans J Tanke
- Department of Molecular Cell Biology, Cancer Genomics Centre and Centre for Biomedical Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Dwi U Kemaladewi
- Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Willem Mh Hoogaars
- Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Peter Ac 't Hoen
- Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Annemieke Aartsma-Rus
- Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Ian M Clark
- School of Biological Sciences, University of East Anglia, Norwich Research Park, UK
| | - Peter Ten Dijke
- Department of Molecular Cell Biology, Cancer Genomics Centre and Centre for Biomedical Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Marie-José Goumans
- Department of Molecular Cell Biology, Cancer Genomics Centre and Centre for Biomedical Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Marianna Kruithof-de Julio
- Department of Molecular Cell Biology, Cancer Genomics Centre and Centre for Biomedical Genetics, Leiden University Medical Center, Leiden, The Netherlands
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165
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Liu X, Chhipa RR, Nakano I, Dasgupta B. The AMPK inhibitor compound C is a potent AMPK-independent antiglioma agent. Mol Cancer Ther 2014; 13:596-605. [PMID: 24419061 DOI: 10.1158/1535-7163.mct-13-0579] [Citation(s) in RCA: 210] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
AMP-activated protein kinase (AMPK) is an evolutionarily conserved energy sensor important for cell growth, proliferation, survival, and metabolic regulation. Active AMPK inhibits biosynthetic enzymes like mTOR and acetyl CoA carboxylase (required for protein and lipid synthesis, respectively) to ensure that cells maintain essential nutrients and energy during metabolic crisis. Despite our knowledge about this incredibly important kinase, no specific chemical inhibitors are available to examine its function. However, one small molecule known as compound C (also called dorsomorphin) has been widely used in cell-based, biochemical, and in vivo assays as a selective AMPK inhibitor. In nearly all these reports including a recent study in glioma, the biochemical and cellular effects of compound C have been attributed to its inhibitory action toward AMPK. While examining the status of AMPK activation in human gliomas, we observed that glioblastomas express copious amount of active AMPK. Compound C effectively reduced glioma viability in vitro both by inhibiting proliferation and inducing cell death. As expected, compound C inhibited AMPK; however, all the antiproliferative effects of this compound were AMPK independent. Instead, compound C killed glioma cells by multiple mechanisms, including activation of the calpain/cathepsin pathway, inhibition of AKT, mTORC1/C2, cell-cycle block at G2-M, and induction of necroptosis and autophagy. Importantly, normal astrocytes were significantly less susceptible to compound C. In summary, compound C is an extremely potent antiglioma agent but we suggest that caution should be taken in interpreting results when this compound is used as an AMPK inhibitor.
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Affiliation(s)
- Xiaona Liu
- Corresponding Author: Biplab Dasgupta, Department of Oncology, Cincinnati Children's Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229.
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166
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Noisa P, Lund C, Kanduri K, Lund R, Lähdesmäki H, Lahesmaa R, Lundin K, Chokechuwattanalert H, Otonkoski T, Tuuri T, Raivio T. Notch signaling regulates neural crest differentiation from human pluripotent stem cells. J Cell Sci 2014; 127:2083-94. [DOI: 10.1242/jcs.145755] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Neural crest (NC) cells are specified at the border of neural plate and epiderm. They are capable of differentiating into various somatic cell types, including craniofacial and peripheral nerve tissues. Notch signaling plays significant roles during neurogenesis; however, its function during human NC development is poorly understood. Here, we generated self-renewing premigratory NC-like cells (pNCCs) from human pluripotent stem cells and investigated the roles of Notch signaling during the NC differentiation. pNCCs expressed various NC specifier genes, including SLUG, SOX10 and TWIST1, and were able to differentiate into most NC derivatives. Blocking Notch signaling during the pNCC differentiation suppressed the expression of NC specifier genes. In contrast, ectopic expression of activated Notch1 intracellular domain (NICD1) augmented the expression of NC specifier genes, and NICD1 was found to bind at their promoter regions. Notch activity was also required for the maintenance of premigratory NC state, and suppression of Notch led to generation of NC-derived neurons. Taken together, we provide a protocol for the generation of pNCCs, and show that Notch signaling regulates the formation, migration and differentiation of NC from hPSCs.
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167
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Meng H, Zhao Y, Dong J, Xue M, Lin YS, Ji Z, Mai WX, Zhang H, Chang CH, Brinker CJ, Zink JI, Nel AE. Two-wave nanotherapy to target the stroma and optimize gemcitabine delivery to a human pancreatic cancer model in mice. ACS NANO 2013; 7:10048-65. [PMID: 24143858 PMCID: PMC3878438 DOI: 10.1021/nn404083m] [Citation(s) in RCA: 133] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Pancreatic ductal adenocarcinoma (PDAC) elicits a dense stromal response that blocks vascular access because of pericyte coverage of vascular fenestrations. In this way, the PDAC stroma contributes to chemotherapy resistance in addition to causing other problems. In order to improve the delivery of gemcitabine, a first-line chemotherapeutic agent, a PEGylated drug-carrying liposome was developed, using a transmembrane ammonium sulfate gradient to encapsulate the protonated drug up to 20% w/w. However, because the liposome was precluded from entering the xenograft site due to the stromal interference, we developed a first-wave nanocarrier that decreases pericyte coverage of the vasculature through interference in the pericyte recruiting TGF-β signaling pathway. This was accomplished using a polyethyleneimine (PEI)/polyethylene glycol (PEG)-coated mesoporous silica nanoparticle (MSNP) for molecular complexation to a small molecule TGF-β inhibitor, LY364947. LY364947 contains a nitrogen atom that attaches, through H-bonding, to PEI amines with a high rate of efficiency. The copolymer coating also facilitates systemic biodistribution and retention at the tumor site. Because of the high loading capacity and pH-dependent LY364947 release from the MSNPs, we achieved rapid entry of IV-injected liposomes and MSNPs at the PDAC tumor site. This two-wave approach provided effective shrinkage of the tumor xenografts beyond 25 days, compared to the treatment with free drug or gemcitabine-loaded liposomes only. Not only does this approach overcome stromal resistance to drug delivery in PDAC, but it also introduces the concept of using a stepwise engineered approach to address a range of biological impediments that interfere in nanocancer therapy in a spectrum of cancers.
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Affiliation(s)
- Huan Meng
- Division of NanoMedicine, Department of Medicine, University of California, Los Angeles, California, United States
- Address correspondence to: and
| | - Yang Zhao
- Division of NanoMedicine, Department of Medicine, University of California, Los Angeles, California, United States
| | - Juyao Dong
- Department of Chemistry & Biochemistry, University of California, Los Angeles, California, United States
| | - Min Xue
- Department of Chemistry & Biochemistry, University of California, Los Angeles, California, United States
| | - Yu-Shen Lin
- Center for Micro-Engineered Materials, The University of New Mexico, Albuquerque, New Mexico 87131
| | - Zhaoxia Ji
- California NanoSystems Institute, University of California, Los Angeles, California, United States
| | - Wilson X. Mai
- Division of NanoMedicine, Department of Medicine, University of California, Los Angeles, California, United States
| | - Haiyuan Zhang
- Division of NanoMedicine, Department of Medicine, University of California, Los Angeles, California, United States
| | - Chong Hyun Chang
- California NanoSystems Institute, University of California, Los Angeles, California, United States
| | - C. Jeffrey Brinker
- Self-Assembled Materials Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
- Department of Chemical and Nuclear Engineering, The University of New Mexico, Albuquerque, New Mexico 87131 and Sandia National Laboratories, Albuquerque, NM 87106
| | - Jeffrey I. Zink
- Department of Chemistry & Biochemistry, University of California, Los Angeles, California, United States
- California NanoSystems Institute, University of California, Los Angeles, California, United States
| | - Andre E. Nel
- Division of NanoMedicine, Department of Medicine, University of California, Los Angeles, California, United States
- California NanoSystems Institute, University of California, Los Angeles, California, United States
- Address correspondence to: and
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168
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TGF-ß induces Lysyl hydroxylase 2b in human synovial osteoarthritic fibroblasts through ALK5 signaling. Cell Tissue Res 2013; 355:163-71. [PMID: 24192939 DOI: 10.1007/s00441-013-1740-5] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Accepted: 09/23/2013] [Indexed: 12/20/2022]
Abstract
Lysyl hydroxylase 2b (LH2b) is known to increase pyridinoline cross-links, making collagen less susceptible to enzymatic degradation. Previously, we observed a relationship between LH2b and osteoarthritis-related fibrosis in murine knee joint. For this study, we investigate if transforming growth factor-beta (TGF-ß) and connective tissue growth factor (CTGF) regulate procollagen-lysine, 2-oxoglutarate 5-dioxygenase 2 (PLOD2) (gene encoding LH2b) and LH2b expression differently in osteoarthritic human synovial fibroblasts (hSF). Furthermore, we investigate via which TGF-ß route (Smad2/3P or Smad1/5/8P) LH2b is regulated, to explore options to inhibit LH2b during fibrosis. To answer these questions, fibroblasts were isolated from knee joints of osteoarthritis patients. The hSF were stimulated with TGF-ß with or without a kinase inhibitor of ALK4/5/7 (SB-505124) or ALK1/2/3/6 (dorsomorphin). TGF-ß, CTGF, constitutively active (ca)ALK1 and caALK5 were adenovirally overexpressed in hSF. The gene expression levels of PLOD1/2/3, CTGF and COL1A1 were analyzed with Q-PCR. LH2 protein levels were determined with western blot. As expected, TGF-ß induced PLOD2/LH2 expression in hSF, whereas CTGF did not. PLOD1 and PLOD3 were not affected by either TGF-ß or CTGF. SB-505124 prevented the induction of TGF-ß-induced PLOD2, CTGF and COL1A1. Surprisingly, dorsomorphin completely blocked the induction of CTGF and COL1A1, whereas TGF-ß-induced PLOD2 was only slightly reduced. Overexpression of caALK5 in osteoarthritic hSF significantly induced PLOD2/LH2 expression, whereas caALK1 had no effect. We showed, in osteoarthritic hSF, that TGF-ß induced PLOD2/LH2 via ALK5 Smad2/3P. This elevation of LH2b in osteoarthritic hSF makes LH2b an interesting target to interfere with osteoarthritis-related persistent fibrosis.
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169
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Rena G, Pearson ER, Sakamoto K. Molecular mechanism of action of metformin: old or new insights? Diabetologia 2013; 56:1898-906. [PMID: 23835523 PMCID: PMC3737434 DOI: 10.1007/s00125-013-2991-0] [Citation(s) in RCA: 317] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Accepted: 06/13/2013] [Indexed: 12/24/2022]
Abstract
Metformin is the first-line drug treatment for type 2 diabetes. Globally, over 100 million patients are prescribed this drug annually. Metformin was discovered before the era of target-based drug discovery and its molecular mechanism of action remains an area of vigorous diabetes research. An improvement in our understanding of metformin's molecular targets is likely to enable target-based identification of second-generation drugs with similar properties, a development that has been impossible up to now. The notion that 5' AMP-activated protein kinase (AMPK) mediates the anti-hyperglycaemic action of metformin has recently been challenged by genetic loss-of-function studies, thrusting the AMPK-independent effects of the drug into the spotlight for the first time in more than a decade. Key AMPK-independent effects of the drug include the mitochondrial actions that have been known for many years and which are still thought to be the primary site of action of metformin. Coupled with recent evidence of AMPK-independent effects on the counter-regulatory hormone glucagon, new paradigms of AMPK-independent drug action are beginning to take shape. In this review we summarise the recent research developments on the molecular action of metformin.
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Affiliation(s)
- Graham Rena
- Cardiovascular and Diabetes Medicine, Ninewells Hospital and Medical School, University of Dundee, Dundee, DD1 9SY UK
| | - Ewan R. Pearson
- Cardiovascular and Diabetes Medicine, Ninewells Hospital and Medical School, University of Dundee, Dundee, DD1 9SY UK
| | - Kei Sakamoto
- Nestlé Institute of Health Sciences SA, Campus EPFL, Quartier de l’innovation, bâtiment G, 1015 Lausanne, Switzerland
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170
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Fenwick MA, Mora JM, Mansour YT, Baithun C, Franks S, Hardy K. Investigations of TGF-β signaling in preantral follicles of female mice reveal differential roles for bone morphogenetic protein 15. Endocrinology 2013; 154:3423-36. [PMID: 23782946 DOI: 10.1210/en.2012-2251] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Bone morphogenetic protein 15 (BMP15) and growth differentiation factor 9 (GDF9) are 2 closely related TGF-β ligands implicated as key regulators of follicle development and fertility. Animals harboring mutations of these factors often exhibit a blockage in follicle development beyond the primary stage and therefore little is known about the role of these ligands during subsequent (preantral) stages. Preantral follicles isolated from immature mice were cultured with combinations of BMP15, GDF9, and activin receptor-like kinase (ALK) inhibitors. Individually, GDF9 and BMP15 promoted follicle growth during the first 24 hours, whereas BMP15 subsequently (48-72 h) caused follicle shrinkage and atresia with increased granulosa cell apoptosis. Inhibition of ALK6 prevented the BMP15-induced reduction in follicle size and under basal conditions promoted a rapid increase in granulosa cell proliferation, suggesting BMP15 signals through ALK6, which in turn acts to restrain follicle growth. In the presence of GDF9, BMP15 no longer promoted atresia and in fact follicle growth was increased significantly more than with either ligand alone. This cooperative effect was accompanied by differential expression of Id1-3, Smad6-7, and Has2 and was blocked by the same ALK5 inhibitor used to block GDF9 signaling. Immunostaining for SMAD2/3 and SMAD1/5/8, representing the 2 main branches of TGF-β signaling, supported the fact that both canonical pathways have the potential to be active in growing follicles, whereas primordial follicles only express SMAD2/3. Overall results highlight differential effects of the 2 main TGF-β signaling pathways during preantral follicle growth.
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Affiliation(s)
- Mark A Fenwick
- Institute of Reproductive and Developmental Biology, Imperial College London, Hammersmith Hospital, Du Cane Road, London W12 0NN, United Kingdom.
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171
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Gonzalez EJ, Girard BM, Vizzard MA. Expression and function of transforming growth factor-β isoforms and cognate receptors in the rat urinary bladder following cyclophosphamide-induced cystitis. Am J Physiol Renal Physiol 2013; 305:F1265-76. [PMID: 23926183 DOI: 10.1152/ajprenal.00042.2013] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Numerous proinflammatory cytokines have been implicated in the reorganization of lower urinary tract function following cyclophosphamide (CYP)-induced cystitis. The present study investigated the functional profile of three pleiotropic transforming growth factor-β (TGF-β) isoforms and receptor (TβR) variants in the normal and inflamed (CYP-induced cystitis) rat urinary bladder. Our findings indicate that TGF-β (1, 2, and 3) and TβR (1, 2, and 3) transcript and protein expression were regulated to varying degrees in the urothelium or detrusor smooth muscle following intermediate (48 h; 150 mg/kg ip) or chronic (75 mg/kg ip; once every 3 days for 10 days), but not acute (4 h; 150 mg/kg ip), CYP-induced cystitis. Conscious, open-outlet cystometry was performed to determine whether aberrant TGF-β signaling contributes to urinary bladder dysfunction following intermediate (48 h) CYP-induced cystitis. TβR-1 inhibition with SB505124 (5 μM) significantly (p ≤ 0.001) decreased voiding frequency and increased bladder capacity (2.5-fold), void volume (2.6-fold), and intercontraction intervals (2.5-fold) in CYP-treated (48 h) rats. Taken together, these results provide evidence for 1) the involvement of TGF-β in lower urinary tract neuroplasticity following urinary bladder inflammation, 2) a functional role of TGF-β signaling in the afferent limb of the micturition reflex, and 3) urinary bladder TβR-1 as a viable target to reduce voiding frequency with cystitis.
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Affiliation(s)
- Eric J Gonzalez
- Univ. of Vermont College of Medicine, Dept. of Neurological Sciences, D415A Given Research Bldg., Burlington, VT 05405.
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172
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Al-Salihi MA, Herhaus L, Macartney T, Sapkota GP. USP11 augments TGFβ signalling by deubiquitylating ALK5. Open Biol 2013; 2:120063. [PMID: 22773947 PMCID: PMC3390794 DOI: 10.1098/rsob.120063] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Accepted: 05/31/2012] [Indexed: 12/20/2022] Open
Abstract
The TGFβ receptors signal through phosphorylation and nuclear translocation of SMAD2/3. SMAD7, a transcriptional target of TGFβ signals, negatively regulates the TGFβ pathway by recruiting E3 ubiquitin ligases and targeting TGFβ receptors for ubiquitin-mediated degradation. In this report, we identify a deubiquitylating enzyme USP11 as an interactor of SMAD7. USP11 enhances TGFβ signalling and can override the negative effects of SMAD7. USP11 interacts with and deubiquitylates the type I TGFβ receptor (ALK5), resulting in enhanced TGFβ-induced gene transcription. The deubiquitylase activity of USP11 is required to enhance TGFβ-induced gene transcription. RNAi-mediated depletion of USP11 results in inhibition of TGFβ-induced SMAD2/3 phosphorylation and TGFβ-mediated transcriptional responses. Central to TGFβ pathway signalling in early embryogenesis and carcinogenesis is TGFβ-induced epithelial to mesenchymal transition. USP11 depletion results in inhibition of TGFβ-induced epithelial to mesenchymal transition.
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Affiliation(s)
- Mazin A Al-Salihi
- Medical Research Council - Protein Phosphorylation Unit, College of Life Sciences, University of Dundee, Dow St., Dundee DD1 5EH, UK
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173
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Buro C, Oliveira KC, Lu Z, Leutner S, Beckmann S, Dissous C, Cailliau K, Verjovski-Almeida S, Grevelding CG. Transcriptome analyses of inhibitor-treated schistosome females provide evidence for cooperating Src-kinase and TGFβ receptor pathways controlling mitosis and eggshell formation. PLoS Pathog 2013; 9:e1003448. [PMID: 23785292 PMCID: PMC3681755 DOI: 10.1371/journal.ppat.1003448] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2012] [Accepted: 05/07/2013] [Indexed: 11/18/2022] Open
Abstract
Schistosome parasites cause schistosomiasis, one of the most prevalent parasitemias worldwide affecting humans and animals. Constant pairing of schistosomes is essential for female sexual maturation and egg production, which causes pathogenesis. Female maturation involves signaling pathways controlling mitosis and differentiation within the gonads. In vitro studies had shown before that a Src-specific inhibitor, Herbimycin A (Herb A), and a TGFβ receptor (TβR) inhibitor (TRIKI) have physiological effects such as suppressed mitoses and egg production in paired females. As one Herb A target, the gonad-specifically expressed Src kinase SmTK3 was identified. Here, we comparatively analyzed the transcriptome profiles of Herb A- and TRIKI-treated females identifying transcriptional targets of Src-kinase and TβRI pathways. After demonstrating that TRIKI inhibits the schistosome TGFβreceptor SmTβRI by kinase assays in Xenopus oocytes, couples were treated with Herb A, TRIKI, or both inhibitors simultaneously in vitro. RNA was isolated from females for microarray hybridizations and transcription analyses. The obtained data were evaluated by Gene Ontology (GO) and Ingenuity Pathway Analysis (IPA), but also by manual classification and intersection analyses. Finally, extensive qPCR experiments were done to verify differential transcription of candidate genes under inhibitor influence but also to functionally reinforce specific physiological effects. A number of genes found to be differentially regulated are associated with mitosis and differentiation. Among these were calcium-associated genes and eggshell-forming genes. In situ hybridization confirmed transcription of genes coding for the calcium sensor hippocalcin, the calcium transporter ORAI-1, and the calcium-binding protein calmodulin-4 in the reproductive system pointing to a role of calcium in parasite reproduction. Functional qPCR results confirmed an inhibitor-influenced, varying dependence of the transcriptional activities of Smp14, Smp48, fs800, a predicted eggshell precursor protein and SmTYR1. The results show that eggshell-formation is regulated by at least two pathways cooperatively operating in a balanced manner to control egg production. As one of the most prevalent parasitic infections worldwide, schistosomiasis is caused by blood-flukes of the genus Schistosoma. Pathology coincides with egg production, which is started upon pairing of the dioeciously living adults. A constant pairing contact is required to induce mitoses and differentiation processes in the female leading to the development of the gonads. Although long known, the molecular processes controlling gonad development or egg-production in schistosomes or other platyhelminths are largely unknown. Using an established in vitro-culture system and specific, chemical inhibitors we have obtained first evidence in previous studies for the participation of signal transduction processes playing essential roles in controlling mitoses, differentiation and egg production. In the present study we applied combinatory inhibitor treatments combined with subsequent microarray and qPCR analyses and demonstrate for the first time that cooperating Src-Kinase- und TGFβ-signaling pathways control mitoses and egg formation processes. Besides direct evidence for managing transcription of eggshell-forming genes, new target molecules of these pathways were identified. Among these are calcium-associated genes providing a first hint towards a role of this ion for reproduction. Our finding shed first light on the signaling mechanisms controlling egg formation, which is important for life-cycling and pathology.
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Affiliation(s)
- Christin Buro
- Institute of Parasitology, Justus-Liebig-University Giessen, Giessen, Germany
| | - Katia C. Oliveira
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brasil
| | - Zhigang Lu
- Institute of Parasitology, Justus-Liebig-University Giessen, Giessen, Germany
| | - Silke Leutner
- Institute of Parasitology, Justus-Liebig-University Giessen, Giessen, Germany
| | - Svenja Beckmann
- Institute of Parasitology, Justus-Liebig-University Giessen, Giessen, Germany
| | - Colette Dissous
- CIIL - Center of Infection and Immunity of Lille, Université Lille Nord de France, Inserm U1019, CNRS-UMR 8204, Institut Pasteur de Lille, Lille, France
| | - Katia Cailliau
- Laboratoire de Régulation des Signaux de Division, Université Lille 1 Sciences et Technology, EA 4479, IFR 147, Villeneuve d'Ascq, France
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174
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Sapkota GP. The TGFβ-induced phosphorylation and activation of p38 mitogen-activated protein kinase is mediated by MAP3K4 and MAP3K10 but not TAK1. Open Biol 2013; 3:130067. [PMID: 23760366 PMCID: PMC3718330 DOI: 10.1098/rsob.130067] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The signalling pathways downstream of the transforming growth factor beta (TGFβ) family of cytokines play critical roles in all aspects of cellular homeostasis. The phosphorylation and activation of p38 mitogen-activated protein kinase (MAPK) has been implicated in TGFβ-induced epithelial-to-mesenchymal transition and apoptosis. The precise molecular mechanisms by which TGFβ cytokines induce the phosphorylation and activation of p38 MAPK are unclear. In this study, I demonstrate that TGFβ-activated kinase 1 (TAK1/MAP3K7) does not play a role in the TGFβ-induced phosphorylation and activation of p38 MAPK in MEFs and HaCaT keratinocytes. Instead, RNAi-mediated depletion of MAP3K4 and MAP3K10 results in the inhibition of the TGFβ-induced p38 MAPK phosphorylation. Furthermore, the depletion of MAP3K10 from cells homozygously knocked-in with a catalytically inactive mutant of MAP3K4 completely abolishes the TGFβ-induced phosphorylation of p38 MAPK, implying that among MAP3Ks, MAP3K4 and MAP3K10 are sufficient for mediating the TGFβ-induced activation of p38 MAPK.
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Affiliation(s)
- Gopal P Sapkota
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, UK.
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175
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Choi EJ, Kim YH, Choe SW, Tak YG, Garrido-Martin EM, Chang M, Lee YJ, Oh SP. Enhanced responses to angiogenic cues underlie the pathogenesis of hereditary hemorrhagic telangiectasia 2. PLoS One 2013; 8:e63138. [PMID: 23675457 PMCID: PMC3651154 DOI: 10.1371/journal.pone.0063138] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Accepted: 03/28/2013] [Indexed: 12/11/2022] Open
Abstract
Hereditary Hemorrhagic Telangiectasia (HHT) is a genetic vascular disease in which arteriovenous malformations (AVMs) manifest in skin and multiple visceral organs. HHT is caused by heterozygous mutations in endoglin (ENG), activin receptor-like kinase 1 (ALK1), or SMAD4. ALK1 regulates angiogenesis, but the precise function of ALK1 in endothelial cells (ECs) remains elusive. Since most blood vessels of HHT patients do not produce pathological vascular lesions, ALK1 heterozygous ECs may be normal unless additional genetic or environmental stresses are imposed. To investigate the cellular and biochemical phenotypes of Alk1-null versus Alk1-heterozygous ECs, we have generated pulmonary EC lines in which a genotype switch from the Alk1-conditional allele (Alk1 (2f)) to the Alk1-null allele (Alk1 (1f)) can be induced by tamoxifen treatment. Alk1-null (1 f/1 f) ECs displayed increased migratory properties in vitro in response to bFGF compared with Alk1-het (2 f/1 f) ECs. The 1 f/1 f-ECs formed a denser and more persistent tubular network as compared with their parental 2 f/1 f-ECs. Interestingly, the response to BMP-9 on SMAD1/5 phosphorylation was impaired in both 2 f/1 f- and 1 f/1 f-ECs at a comparable manner, suggesting that other factors in addition to SMADs may play a crucial role for enhanced angiogenic activity in 1 f/1 f-ECs. We also demonstrated in vivo that Alk1-deficient ECs exhibited high migratory and invasive properties. Taken together, these data suggest that enhanced responses to angiogenic cues in ALK1-deficient ECs underlie the pathogenesis of HHT2.
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Affiliation(s)
- Eun-Jung Choi
- Department of Physiology and Functional Genomics, College of Medicine, University of Florida, Gainesville, Florida, United States of America
| | - Yong Hwan Kim
- Department of Physiology and Functional Genomics, College of Medicine, University of Florida, Gainesville, Florida, United States of America
| | - Se-woon Choe
- Department of Physiology and Functional Genomics, College of Medicine, University of Florida, Gainesville, Florida, United States of America
| | - Yu Gyoung Tak
- World Class University Program, Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon, Republic of Korea
| | - Eva M. Garrido-Martin
- Department of Physiology and Functional Genomics, College of Medicine, University of Florida, Gainesville, Florida, United States of America
| | - Myron Chang
- Department of Biostatistics, University of Florida, Gainesville, Florida, United States of America
| | - Young Jae Lee
- Department of Physiology and Functional Genomics, College of Medicine, University of Florida, Gainesville, Florida, United States of America
- World Class University Program, Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon, Republic of Korea
| | - S. Paul Oh
- Department of Physiology and Functional Genomics, College of Medicine, University of Florida, Gainesville, Florida, United States of America
- World Class University Program, Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon, Republic of Korea
- * E-mail:
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176
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Echeverría C, Montorfano I, Sarmiento D, Becerra A, Nuñez-Villena F, Figueroa XF, Cabello-Verrugio C, Elorza AA, Riedel C, Simon F. Lipopolysaccharide induces a fibrotic-like phenotype in endothelial cells. J Cell Mol Med 2013; 17:800-14. [PMID: 23635013 PMCID: PMC3823184 DOI: 10.1111/jcmm.12066] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2012] [Accepted: 03/24/2013] [Indexed: 02/06/2023] Open
Abstract
Endothelial dysfunction is crucial in endotoxaemia-derived sepsis syndrome pathogenesis. It is well accepted that lipopolysaccharide (LPS) induces endothelial dysfunction through immune system activation. However, LPS can also directly generate actions in endothelial cells (ECs) in the absence of participation by immune cells. Although interactions between LPS and ECs evoke endothelial death, a significant portion of ECs are resistant to LPS challenge. However, the mechanism that confers endothelial resistance to LPS is not known. LPS-resistant ECs exhibit a fibroblast-like morphology, suggesting that these ECs enter a fibrotic programme in response to LPS. Thus, our aim was to investigate whether LPS is able to induce endothelial fibrosis in the absence of immune cells and explore the underlying mechanism. Using primary cultures of ECs and culturing intact blood vessels, we demonstrated that LPS is a crucial factor to induce endothelial fibrosis. We demonstrated that LPS was able and sufficient to promote endothelial fibrosis, in the absence of immune cells through an activin receptor-like kinase 5 (ALK5) activity-dependent mechanism. LPS-challenged ECs showed an up-regulation of both fibroblast-specific protein expression and extracellular matrix proteins secretion, as well as a down-regulation of endothelial markers. These results demonstrate that LPS is a crucial factor in inducing endothelial fibrosis in the absence of immune cells through an ALK5-dependent mechanism. It is noteworthy that LPS-induced endothelial fibrosis perpetuates endothelial dysfunction as a maladaptive process rather than a survival mechanism for protection against LPS. These findings are useful in improving current treatment against endotoxaemia-derived sepsis syndrome and other inflammatory diseases.
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Affiliation(s)
- César Echeverría
- Departamento de Ciencias Biológicas, Facultad de Ciencias Biológicas & Facultad de Medicina, Universidad Andres Bello, Santiago, Chile
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177
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Abstract
Much of the focus on the transforming growth factor-β (TGFβ) superfamily in cancer has revolved around the TGFβ ligands themselves. However, it is now becoming apparent that deregulated signalling by many of the other superfamily members also has crucial roles in both the development of tumours and metastasis. Furthermore, these signalling pathways are emerging as plausible therapeutic targets. Their roles in tumorigenesis frequently reflect their function in embryonic development or in adult tissue homeostasis, and their influence extends beyond the tumours themselves, to the tumour microenvironment and more widely to complications of cancer such as cachexia and bone loss.
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Affiliation(s)
- Lalage M Wakefield
- Laboratory of Cancer Biology and Genetics, National Cancer Institute, Bethesda, Maryland 20892-4255, USA.
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178
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Jaremko KL, Marikawa Y. Regulation of developmental competence and commitment towards the definitive endoderm lineage in human embryonic stem cells. Stem Cell Res 2013; 10:489-502. [DOI: 10.1016/j.scr.2012.04.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2011] [Revised: 03/09/2012] [Accepted: 04/15/2012] [Indexed: 12/13/2022] Open
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179
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Mohedas AH, Xing X, Armstrong KA, Bullock AN, Cuny GD, Yu PB. Development of an ALK2-biased BMP type I receptor kinase inhibitor. ACS Chem Biol 2013; 8:1291-302. [PMID: 23547776 PMCID: PMC3901569 DOI: 10.1021/cb300655w] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The bone morphogenetic protein (BMP) signaling pathway has essential functions in development, homeostasis, and the normal and pathophysiologic remodeling of tissues. Small molecule inhibitors of the BMP receptor kinase family have been useful for probing physiologic functions of BMP signaling in vitro and in vivo and may have roles in the treatment of BMP-mediated diseases. Here we describe the development of a selective and potent inhibitor of the BMP type I receptor kinases, LDN-212854, which in contrast to previously described BMP receptor kinase inhibitors exhibits nearly 4 orders of selectivity for BMP versus the closely related TGF-β and Activin type I receptors. In vitro, LDN-212854 exhibits some selectivity for ALK2 in preference to other BMP type I receptors, ALK1 and ALK3, which may permit the interrogation of ALK2-mediated signaling, transcriptional activity, and function. LDN-212854 potently inhibits heterotopic ossification in an inducible transgenic mutant ALK2 mouse model of fibrodysplasia ossificans progressiva. These findings represent a significant step toward developing selective inhibitors targeting individual members of the highly homologous BMP type I receptor family. Such inhibitors would provide greater resolution as probes of physiologic function and improved selectivity against therapeutic targets.
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Affiliation(s)
- Agustin H. Mohedas
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139
- Harvard Medical School, 25 Shattuck St., Boston, MA 02115
| | - Xuechao Xing
- Laboratory for Drug Discovery in Neurodegeneration, Harvard NeuroDiscovery Center, Brigham and Women’s Hospital and Harvard Medical School, 65 Landsdowne Street, Cambridge, Massachusetts 02139
| | - Kelli A. Armstrong
- Department of Medicine, Cardiovascular Division, Brigham and Women’s Hospital, 75 Francis St., Boston, MA 02115
| | - Alex N. Bullock
- Structural Genomics Consortium, University of Oxford, Oxford OX3 7DQ, United Kingdom
| | - Gregory D. Cuny
- Laboratory for Drug Discovery in Neurodegeneration, Harvard NeuroDiscovery Center, Brigham and Women’s Hospital and Harvard Medical School, 65 Landsdowne Street, Cambridge, Massachusetts 02139
| | - Paul B. Yu
- Harvard Medical School, 25 Shattuck St., Boston, MA 02115
- Department of Medicine, Cardiovascular Division, Brigham and Women’s Hospital, 75 Francis St., Boston, MA 02115
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180
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Sanvitale CE, Kerr G, Chaikuad A, Ramel MC, Mohedas AH, Reichert S, Wang Y, Triffitt JT, Cuny GD, Yu PB, Hill CS, Bullock AN. A new class of small molecule inhibitor of BMP signaling. PLoS One 2013; 8:e62721. [PMID: 23646137 PMCID: PMC3639963 DOI: 10.1371/journal.pone.0062721] [Citation(s) in RCA: 183] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2012] [Accepted: 03/24/2013] [Indexed: 01/24/2023] Open
Abstract
Growth factor signaling pathways are tightly regulated by phosphorylation and include many important kinase targets of interest for drug discovery. Small molecule inhibitors of the bone morphogenetic protein (BMP) receptor kinase ALK2 (ACVR1) are needed urgently to treat the progressively debilitating musculoskeletal disease fibrodysplasia ossificans progressiva (FOP). Dorsomorphin analogues, first identified in zebrafish, remain the only BMP inhibitor chemotype reported to date. By screening an assay panel of 250 recombinant human kinases we identified a highly selective 2-aminopyridine-based inhibitor K02288 with in vitro activity against ALK2 at low nanomolar concentrations similar to the current lead compound LDN-193189. K02288 specifically inhibited the BMP-induced Smad pathway without affecting TGF-β signaling and induced dorsalization of zebrafish embryos. Comparison of the crystal structures of ALK2 with K02288 and LDN-193189 revealed additional contacts in the K02288 complex affording improved shape complementarity and identified the exposed phenol group for further optimization of pharmacokinetics. The discovery of a new chemical series provides an independent pharmacological tool to investigate BMP signaling and offers multiple opportunities for pre-clinical development.
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Affiliation(s)
| | - Georgina Kerr
- Structural Genomics Consortium, University of Oxford, Oxford, United Kingdom
| | - Apirat Chaikuad
- Structural Genomics Consortium, University of Oxford, Oxford, United Kingdom
| | - Marie-Christine Ramel
- Laboratory of Developmental Signalling, Cancer Research UK London Research Institute, London, United Kingdom
| | - Agustin H. Mohedas
- Department of Medicine Cardiovascular Division, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Sabine Reichert
- Laboratory of Developmental Signalling, Cancer Research UK London Research Institute, London, United Kingdom
| | - You Wang
- Laboratory for Drug Discovery in Neurodegeneration, Brigham and Women’s Hospital and Harvard Medical School, Cambridge, Massachusetts, United States of America
| | - James T. Triffitt
- Botnar Research Centre, University of Oxford, Oxford, United Kingdom
| | - Gregory D. Cuny
- Laboratory for Drug Discovery in Neurodegeneration, Brigham and Women’s Hospital and Harvard Medical School, Cambridge, Massachusetts, United States of America
| | - Paul B. Yu
- Department of Medicine Cardiovascular Division, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Caroline S. Hill
- Laboratory of Developmental Signalling, Cancer Research UK London Research Institute, London, United Kingdom
| | - Alex N. Bullock
- Structural Genomics Consortium, University of Oxford, Oxford, United Kingdom
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181
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Engers DW, Frist AY, Lindsley CW, Hong CC, Hopkins CR. Synthesis and structure-activity relationships of a novel and selective bone morphogenetic protein receptor (BMP) inhibitor derived from the pyrazolo[1.5-a]pyrimidine scaffold of dorsomorphin: the discovery of ML347 as an ALK2 versus ALK3 selective MLPCN probe. Bioorg Med Chem Lett 2013; 23:3248-52. [PMID: 23639540 DOI: 10.1016/j.bmcl.2013.03.113] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Revised: 03/22/2013] [Accepted: 03/27/2013] [Indexed: 01/20/2023]
Abstract
A structure-activity relationship of the 3- and 6-positions of the pyrazolo[1,5-a]pyrimidine scaffold of the known BMP inhibitors dorsomorphin, 1, LDN-193189, 2, and DMH1, 3, led to the identification of a potent and selective compound for ALK2 versus ALK3. The potency contributions of several 3-position substituents were evaluated with subtle structural changes leading to significant changes in potency. From these studies, a novel 5-quinoline molecule was identified and designated an MLPCN probe molecule, ML347, which shows >300-fold selectivity for ALK2 and presents the community with a selective molecular probe for further biological evaluation.
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Affiliation(s)
- Darren W Engers
- Department of Pharmacology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
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182
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Zimmer J, Degenkolbe E, Wildemann B, Seemann P. BMP Signaling in Regenerative Medicine. Bioinformatics 2013. [DOI: 10.4018/978-1-4666-3604-0.ch064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
More than 40 years after the discovery of Bone Morphogenetic Proteins (BMPs) as bone inducers, a whole protein family of growth factors connected to a wide variety of functions in embryonic development, homeostasis, and regeneration has been characterized. Today, BMP2 and BMP7 are already used in the clinic to promote vertebral fusions and restoration of non-union fractures. Besides describing present clinical applications, the authors review ongoing trials highlighting the future possibilities of BMPs in medicine. Apparently, the physiological roles of BMPs have expanded their range from bone growth induction and connective tissue regeneration to cancer diagnosis/treatment and cardiovascular disease prevention.
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Affiliation(s)
- Julia Zimmer
- Charité-Universitätsmedizin Berlin, Berlin-Brandenburg Center for Regenerative Therapies, Germany
| | - Elisa Degenkolbe
- Charité-Universitätsmedizin Berlin, Berlin-Brandenburg Center for Regenerative Therapies, Germany
| | - Britt Wildemann
- Charité-Universitätsmedizin Berlin, Berlin-Brandenburg Center for Regenerative Therapies, Germany
| | - Petra Seemann
- Charité-Universitätsmedizin Berlin, Berlin-Brandenburg Center for Regenerative Therapies, Germany
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183
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Sun D, Haddad R, Kraniak JM, Horne SD, Tainsky MA. RAS/MEK-independent gene expression reveals BMP2-related malignant phenotypes in the Nf1-deficient MPNST. Mol Cancer Res 2013; 11:616-27. [PMID: 23423222 DOI: 10.1158/1541-7786.mcr-12-0593] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Malignant peripheral nerve sheath tumor (MPNST) is a type of soft tissue sarcoma that occurs in carriers of germline mutations in Nf1 gene as well as sporadically. Neurofibromin, encoded by the Nf1 gene, functions as a GTPase-activating protein (GAP) whose mutation leads to activation of wt-RAS and mitogen-activated protein kinase (MAPK) signaling in neurofibromatosis type I (NF1) patients' tumors. However, therapeutic targeting of RAS and MAPK have had limited success in this disease. In this study, we modulated NRAS, mitogen-activated protein/extracellular signal-regulated kinase (MEK)1/2, and neurofibromin levels in MPNST cells and determined gene expression changes to evaluate the regulation of signaling pathways in MPNST cells. Gene expression changes due to neurofibromin modulation but independent of NRAS and MEK1/2 regulation in MPNST cells indicated bone morphogenetic protein 2 (Bmp2) signaling as a key pathway. The BMP2-SMAD1/5/8 pathway was activated in NF1-associated MPNST cells and inhibition of BMP2 signaling by LDN-193189 or short hairpin RNA (shRNA) to BMP2 decreased the motility and invasion of NF1-associated MPNST cells. The pathway-specific gene changes provide a greater understanding of the complex role of neurofibromin in MPNST pathology and novel targets for drug discovery.
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Affiliation(s)
- Daochun Sun
- Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Wayne State University, Detroit, Michigan 48201, USA
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184
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Surmacz B, Fox H, Gutteridge A, Fish P, Lubitz S, Whiting P. Directing differentiation of human embryonic stem cells toward anterior neural ectoderm using small molecules. Stem Cells 2013; 30:1875-84. [PMID: 22761025 DOI: 10.1002/stem.1166] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Based on knowledge of early embryo development, where anterior neural ectoderm (ANE) development is regulated by native inhibitors of bone morphogenic protein (BMP) and Nodal/Activin signaling, most published protocols of human embryonic stem cell differentiation to ANE have demonstrated a crucial role for Smad signaling in neural induction. The drawbacks of such protocols include the use of an embryoid body culture step and use of polypeptide secreted factors that are both expensive and, when considering clinical applications, have significant challenges in terms of good manufacturing practices compliancy. The use of small molecules to direct differentiation of pluripotent stem cells toward a specified lineage represents a powerful approach to generate specific cell types for further understanding of biological function, for understanding disease processes, for use in drug discovery, and finally for use in regenerative medicine. We therefore aimed to find controlled and reproducible animal-component-free differentiation conditions that would use only small molecules. Here, we demonstrate that pluripotent stem cells can be reproducibly and efficiently differentiated to PAX6(+) (a marker of neuroectoderm) and OCT4(-) (a marker of pluripotent stem cells) cells with the use of potent small inhibitors of the BMP and Activin/Nodal pathways, and in animal-component-free conditions, replacing the frequently used Noggin and SB431542. We also show by transcript analysis, both at the population level and for the first time at the single-cell level, that differentiated cells express genes characteristic for the development of ANE, in particular for the development of the future forebrain.
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Affiliation(s)
- Beata Surmacz
- Neusentis, The Portway Building, Granta Park, Cambridge, United Kingdom
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185
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BMP and TGF-β pathway mediators are critical upstream regulators of Wnt signaling during midbrain dopamine differentiation in human pluripotent stem cells. Dev Biol 2013; 376:62-73. [PMID: 23352789 DOI: 10.1016/j.ydbio.2013.01.012] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Revised: 01/08/2013] [Accepted: 01/09/2013] [Indexed: 01/21/2023]
Abstract
Although many laboratories currently use small molecule inhibitors of the BMP (Dorsomorphin/DM) and TGF-β (SB431542/SB) signaling pathways in protocols to generate midbrain dopamine (mDA) neurons from hES and hiPS cells, until now, these substances have not been thought to play a role in the mDA differentiation process. We report here that the transient inhibition of constitutive BMP (pSMADs 1, 5, 8) signaling, either alone or in combination with TGF-β inhibition (pSMADs 2, 3), is critically important in the upstream regulation of Wnt1-Lmx1a signaling in mDA progenitors. We postulate that the mechanism via which DM or DM/SB mediates these effects involves the up-regulation in SMAD-interacting protein 1 (SIP1), which results in greater repression of the Wnt antagonist, secreted frizzled related protein 1 (Sfrp1) in stem cells. Accordingly, knockdown of SIP1 reverses the inductive effects of DM/SB on mDA differentiation while Sfrp1 knockdown/inhibition mimics DM/SB. The rise in Wnt1-Lmx1a levels in SMAD-inhibited cultures is, however, accompanied by a reciprocal down-regulation in SHH-Foxa2 levels leading to the generation of few TH+ neurons that co-express Foxa2. If however, exogenous SHH/FGF8 is added along with SMAD inhibitors, equilibrium in these two important pathways is achieved such that authentic (Lmx1a+Foxa2+TH+) mDA neuron differentiation is promoted while alternate cell fates are suppressed in stem cell cultures. These data indicate that activators/inhibitors of BMP and TGF-β signaling play a critical upstream regulatory role in the mDA differentiation process in human pluripotent stem cells.
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186
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Hyzy SL, Olivares-Navarrete R, Schwartz Z, Boyan BD. BMP2 induces osteoblast apoptosis in a maturation state and noggin-dependent manner. J Cell Biochem 2013; 113:3236-45. [PMID: 22628200 DOI: 10.1002/jcb.24201] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Large doses of bone morphogenetic protein 2 (BMP2) are used clinically to induce bone formation in challenging bone defects. However, complications after treatment include swelling, ectopic bone formation, and adjacent bone resorption. While BMP2 can be effective, it is important to characterize the mechanism of the deleterious effects to optimize its use. The aim of this study was to determine the effect of BMP2 on apoptosis in osteoblast lineage cells and to determine the role of the BMP inhibitor Noggin in this process. Human mesenchymal stem cells (MSCs), immature osteoblast-like MG63 cells, and mature normal human osteoblasts (NHOst) were treated with BMP2. A model system of increased endogenous BMP signaling was created by silencing Noggin (shNOG-MG63). Finally, the BMP pathway regulating apoptosis in NHOst was examined using BMP signaling inhibitors (5Z-7-oxozeaenol, dorsomorphin, H-8). Apoptosis was characterized by caspase-3, BAX/BCL2, p53, and DNA fragmentation. BMP2 induced apoptosis in a cell-type dependent manner. While the effect was minor in MSCs, MG63 cells had modest increases and NHOst cells had robust increases apoptosis after BMP2 treatment. Apoptosis was significantly higher in shNOG-MG63 than MG63 cells. 5Z-7-oxozeaenol and dorsomorphin eliminated the BMP2-induced increase in DNA fragmentation in NHOst, suggesting roles for TAB/TAK1 and Smad signaling. These results indicate that the apoptotic effect of BMP2 is dependent on cell maturation state, inducing apoptosis in committed osteoblasts through Smad and TAB/TAK1 signaling, and is regulated by Noggin. Dose and delivery must be optimized in therapeutic applications of BMP2 to minimize complications.
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Affiliation(s)
- Sharon L Hyzy
- School of Biology, Georgia Institute of Technology, Atlanta, GA 30332, USA
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187
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Herhaus L, Al-Salihi M, Macartney T, Weidlich S, Sapkota GP. OTUB1 enhances TGFβ signalling by inhibiting the ubiquitylation and degradation of active SMAD2/3. Nat Commun 2013; 4:2519. [PMID: 24071738 PMCID: PMC3791481 DOI: 10.1038/ncomms3519] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Accepted: 08/28/2013] [Indexed: 01/17/2023] Open
Abstract
SMAD transcription factors are key intracellular transducers of TGFβ cytokines. SMADs are tightly regulated to ensure balanced cellular responses to TGFβ signals. Ubiquitylation has a key role in regulating SMAD stability and activity. Several E3 ubiquitin ligases that regulate the turnover of SMADs are known; however, proteins that prevent the ubiquitylation or cause deubiquitylation of active SMADs remain undefined. Here we demonstrate that OTUB1 is recruited to the active phospho-SMAD2/3 complex only on TGFβ induction. Further, OTUB1 has a crucial role in TGFβ-mediated gene transcription and cellular migration. OTUB1 inhibits the ubiquitylation of phospho-SMAD2/3 by binding to and inhibiting the E2 ubiquitin-conjugating enzymes independent of its catalytic activity. Consequently, depletion of OTUB1 in cells causes a rapid loss in levels of TGFβ-induced phospho-SMAD2/3, which is rescued by the proteasomal inhibitor bortezomib. Our findings uncover a signal-induced phosphorylation-dependent recruitment of OTUB1 to its target in the TGFβ pathway.
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Affiliation(s)
- Lina Herhaus
- MRC Protein Phosphorylation Unit, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5 EH, Scotland, UK
| | - Mazin Al-Salihi
- MRC Protein Phosphorylation Unit, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5 EH, Scotland, UK
| | - Thomas Macartney
- MRC Protein Phosphorylation Unit, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5 EH, Scotland, UK
| | - Simone Weidlich
- MRC Protein Phosphorylation Unit, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5 EH, Scotland, UK
| | - Gopal P. Sapkota
- MRC Protein Phosphorylation Unit, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5 EH, Scotland, UK
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188
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Danielpour D. Transforming Growth Factor-Beta in Prostate Cancer. Prostate Cancer 2013. [DOI: 10.1007/978-1-4614-6828-8_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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189
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TGF Beta Signaling and Its Role in Glioma Pathogenesis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2013; 986:171-87. [DOI: 10.1007/978-94-007-4719-7_9] [Citation(s) in RCA: 93] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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190
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Balboni AL, Hutchinson JA, DeCastro AJ, Cherukuri P, Liby K, Sporn MB, Schwartz GN, Wells WA, Sempere LF, Yu PB, DiRenzo J. ΔNp63α-mediated activation of bone morphogenetic protein signaling governs stem cell activity and plasticity in normal and malignant mammary epithelial cells. Cancer Res 2012; 73:1020-30. [PMID: 23243027 DOI: 10.1158/0008-5472.can-12-2862] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Genetic analysis of TP63 indicates that ΔNp63 isoforms are required for preservation of regenerative stasis within diverse epithelial tissues. In squamous carcinomas, TP63 is commonly amplified, and ΔNp63α confers a potent survival advantage. Genome-wide occupancy studies show that ΔNp63 promotes bidirectional target gene regulation by binding more than 5,000 sites throughout the genome; however, the subset of targets mediating discreet activities of TP63 remains unclear. We report that ΔNp63α activates bone morphogenic proteins (BMP) signaling by inducing the expression of BMP7. Immunohistochemical analysis indicates that hyperactivation of BMP signaling is common in human breast cancers, most notably in the basal molecular subtype, as well as in several mouse models of breast cancer. Suppression of BMP signaling in vitro with LDN193189, a small-molecule inhibitor of BMP type I receptor kinases, represses clonogenicity and diminishes the cancer stem cell-enriched ALDH1(+) population. Importantly, LDN193189 blocks reconstitution of mixed ALDH1(+)/ALDH1(-) cultures indicating that BMP signaling may govern aspects of cellular plasticity within tumor hierarchies. These results show that BMP signaling enables reversion of committed populations to a stem-like state, potentially supporting progression and maintenance of tumorigenesis. Treatment of a mouse model of breast cancer with LDN193189 caused reduced expression of markers associated with epithelial-to-mesenchymal transition (EMT). Furthermore, in vivo limiting dilution analysis assays revealed that LDN193189 treatment suppressed tumor-initiating capacity and increased tumor latency. These studies support a model in which ΔNp63α-mediated activation of BMP signaling governs epithelial cell plasticity, EMT, and tumorigenicity during breast cancer initiation and progression.
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Affiliation(s)
- Amanda L Balboni
- Program in Experimental and Molecular Medicine, Department of Pharmacology and Toxicology, The Audrey and Theodor Geisel School of Medicine at Dartmouth, NH 03755, USA
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191
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Fields SZ, Parshad S, Anne M, Raftopoulos H, Alexander MJ, Sherman ML, Laadem A, Sung V, Terpos E. Activin receptor antagonists for cancer-related anemia and bone disease. Expert Opin Investig Drugs 2012; 22:87-101. [PMID: 23127248 DOI: 10.1517/13543784.2013.738666] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
INTRODUCTION Antagonists of activin receptor signaling may be beneficial for cancer-related anemia and bone disease caused by malignancies such as multiple myeloma and solid tumors. AREAS COVERED We review evidence of dysregulated signaling by activin receptor pathways in anemia, myeloma-associated osteolysis, and metastatic bone disease, as well as potential involvement in carcinogenesis. We then review properties of activin receptor antagonists in clinical development. EXPERT OPINION Sotatercept is a novel receptor fusion protein that functions as a soluble trap to sequester ligands of activin receptor type IIA (ActRIIA). Preclinically, the murine version of sotatercept increased red blood cells (RBC) in a model of chemotherapy-induced anemia, inhibited tumor growth and metastasis, and exerted anabolic effects on bone in diverse models of multiple myeloma. Clinically, sotatercept increases RBC markedly in healthy volunteers and patients with multiple myeloma. With a rapid onset of action differing from erythropoietin, sotatercept is in clinical development as a potential first-in-class therapeutic for cancer-related anemia, including those characterized by ineffective erythropoiesis as in myelodysplastic syndromes. Anabolic bone activity in early clinical studies and potential antitumor effects make sotatercept a promising therapeutic candidate for multiple myeloma and malignant bone diseases. Antitumor activity has been observed preclinically with small-molecule inhibitors of transforming growth factor-β receptor type I (ALK5) that also antagonize the closely related activin receptors ALK4 and ALK7. LY-2157299, the first such inhibitor to enter clinical studies, has shown an acceptable safety profile so far in patients with advanced cancer. Together, these data identify activin receptor antagonists as attractive therapeutic candidates for multiple diseases.
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Affiliation(s)
- Scott Z Fields
- Monter Cancer Center, Hofstra North Shore-LIJ School of Medicine, Lake Success, NY, USA
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192
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Luo YJ, Su YH. Opposing nodal and BMP signals regulate left-right asymmetry in the sea urchin larva. PLoS Biol 2012; 10:e1001402. [PMID: 23055827 PMCID: PMC3467216 DOI: 10.1371/journal.pbio.1001402] [Citation(s) in RCA: 88] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Accepted: 08/28/2012] [Indexed: 12/28/2022] Open
Abstract
Nodal and BMP signals are important for establishing left-right (LR) asymmetry in vertebrates. In sea urchins, Nodal signaling prevents the formation of the rudiment on the right side. However, the opposing pathway to Nodal signaling during LR axis establishment is not clear. Here, we revealed that BMP signaling is activated in the left coelomic pouch, specifically in the veg2 lineage, but not in the small micromeres. By perturbing BMP activities, we demonstrated that BMP signaling is required for activating the expression of the left-sided genes and the formation of the left-sided structures. On the other hand, Nodal signals on the right side inhibit BMP signaling and control LR asymmetric separation and apoptosis of the small micromeres. Our findings show that BMP signaling is the positive signal for left-sided development in sea urchins, suggesting that the opposing roles of Nodal and BMP signals in establishing LR asymmetry are conserved in deuterostomes.
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Affiliation(s)
| | - Yi-Hsien Su
- Institute of Cellular and Organismic Biology, Academia Sinica, Nankang, Taipei, Taiwan
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193
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Liu F, Korc M. Cdk4/6 inhibition induces epithelial-mesenchymal transition and enhances invasiveness in pancreatic cancer cells. Mol Cancer Ther 2012; 11:2138-48. [PMID: 22869556 PMCID: PMC3752412 DOI: 10.1158/1535-7163.mct-12-0562] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Aberrant activation of Cyclin D-Cdk4/6 signaling pathway is commonly found in pancreatic ductal adenocarcinoma (PDAC). Here, we show that PD-0332991, a highly specific inhibitor for Cdk4 and Cdk6, exerted growth inhibitory effects on three human PDAC cell lines. Microarray analysis revealed that PD-0332991 downregulated cell-cycle-related genes, but upregulated genes implicated in extracellular matrix (ECM) remodeling and pancreatic cancer cell invasion and metastasis. Moreover, PD-0332991 enhanced invasion in TGF-β-responsive PDAC cell lines that harbor a wild-type SMAD4 gene (COLO-357, PANC-1), but not in TGF-β-resistant AsPC-1 cells that harbor a mutated SMAD4. PD-0332991 also induced epithelial-mesenchymal transition (EMT) in COLO-357 and PANC-1, but not in AsPC-1 cells. Inhibition of CDK4/6 using shRNA mimicked the effects of PD-0332991 on EMT induction. Furthermore, PD-0332991 increased Smad transcriptional activity in luciferase readout assays and activated TGF-β signaling. SB-505124, an inhibitor of the type-I TGF-β receptor (TβRI) kinase, completely blocked EMT induction by PD-0332991. When combined with PD-0332991, SB-505124 inhibited the growth of COLO-357 and PANC-1 cells. Taken together, these data suggest that anti-Cdk4/6 therapy could induce EMT and enhance pancreatic cancer cell invasion by activating Smad-dependent TGF-β signaling, and that combining PD-0332991 and SB-505124 may represent a novel therapeutic strategy in PDAC.
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Affiliation(s)
- Fang Liu
- Departments of Medicine, Biochemistry and Molecular Biology, Indiana University School of Medicine, the Melvin and Bren Simon Cancer Center and the Pancreatic Cancer Signature Center, Indianapolis, IN 46202, USA
| | - Murray Korc
- Departments of Medicine, Biochemistry and Molecular Biology, Indiana University School of Medicine, the Melvin and Bren Simon Cancer Center and the Pancreatic Cancer Signature Center, Indianapolis, IN 46202, USA
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194
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Joseph C, Hunter MG, Sinclair KD, Robinson RS. The expression, regulation and function of secreted protein, acidic, cysteine-rich in the follicle–luteal transition. Reproduction 2012; 144:361-72. [DOI: 10.1530/rep-12-0099] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The role of the tissue remodelling protein, secreted protein, acidic, cysteine-rich (SPARC), in key processes (e.g. cell reorganisation and angiogenesis) that occur during the follicle–luteal transition is unknown. Hence, we investigated the regulation of SPARC in luteinsing follicular cells and potential roles of SPARC peptide 2.3 in a physiologically relevant luteal angiogenesis culture system. SPARC protein was detected mainly in the theca layer of bovine pre-ovulatory follicles, but its expression was considerably greater in the corpus haemorrhagicum. Similarly, SPARC protein (western blotting) was up-regulated in luteinising granulosa but not in theca cells during a 6-day culture period. Potential regulatory candidates were investigated in luteinising granulosa cells: LH did not affect SPARC (P>0.05); transforming growth factor (TGF) B1 (P<0.001) dose dependently induced the precocious expression of SPARC and increased final levels: this effect was blocked (P<0.001) by SB505124 (TGFB receptor 1 inhibitor). Additionally, fibronectin, which is deposited during luteal development, increased SPARC (P<0.01). In luteal cells, fibroblast growth factor 2 decreased SPARC (P<0.001) during the first 5 days of culture, while vascular endothelial growth factor A increased its expression (P<0.001). Functionally, KGHK peptide, a SPARC proteolytic fragment, stimulated the formation of endothelial cell networks in a luteal cell culture system (P<0.05) and increased progesterone production (P<0.05). Collectively, these findings indicate that SPARC is intricately regulated by pro-angiogenic and other growth factors together with components of the extracellular matrix during the follicle–luteal transition. Thus, it is possible that SPARC plays an important modulatory role in regulating angiogenesis and progesterone production during luteal development.
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195
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Rena G, Pearson ER, Sakamoto K. Molecular action and pharmacogenetics of metformin: current understanding of an old drug. ACTA ACUST UNITED AC 2012. [DOI: 10.2217/dmt.12.42] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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196
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Bruce DL, Macartney T, Yong W, Shou W, Sapkota GP. Protein phosphatase 5 modulates SMAD3 function in the transforming growth factor-β pathway. Cell Signal 2012; 24:1999-2006. [PMID: 22781750 DOI: 10.1016/j.cellsig.2012.07.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2012] [Accepted: 07/03/2012] [Indexed: 02/02/2023]
Abstract
Protein phosphatases play a key role in balancing the cellular responses to the transforming growth factor-β (TGFβ) signals. Several protein phosphatases have been attributed roles in the regulation of the TGFβ pathway. Among these, PPM1A is the only phosphatase reported to dephosphorylate SMAD2/3 in the nucleus. However we observed PPM1A exclusively in the cytoplasmic fractions independently of TGFβ treatment in all cells tested. These observations imply that a bona fide nuclear SMAD2/3 phosphatase remains elusive. In this study, we report a role for protein phosphatase 5 (PP5) in the TGFβ pathway. We identified PP5 as an interactor of SMAD2/3. Interestingly, in mouse embryonic fibroblast cells derived from PP5-null mice, TGFβ-induced transcriptional responses were significantly enhanced. Rather surprisingly, this enhancement is due to the increased levels of SMAD3 protein observed in PP5-null MEFs compared to the wild type. No differences in the levels of SMAD3 transcripts were observed between the wild-type and PP5-null MEFs. While PP5 is capable of dephosphorylating SMAD3-tail in overexpression assays, we demonstrate that its activity is essential in controlling SMAD3 protein levels in MEFs. We propose that PP5 regulates the TGFβ pathway in MEFs by regulating the expression of SMAD3 protein levels.
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Affiliation(s)
- David L Bruce
- MRC Protein Phosphorylation Unit, College of Life Sciences, University of Dundee, Dundee, UK
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197
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Overactive bone morphogenetic protein signaling in heterotopic ossification and Duchenne muscular dystrophy. Cell Mol Life Sci 2012; 70:407-23. [PMID: 22752156 PMCID: PMC3541930 DOI: 10.1007/s00018-012-1054-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2012] [Revised: 06/05/2012] [Accepted: 06/07/2012] [Indexed: 12/15/2022]
Abstract
Bone morphogenetic proteins (BMPs) are important extracellular cytokines that play critical roles in embryogenesis and tissue homeostasis. BMPs signal via transmembrane type I and type II serine/threonine kinase receptors and intracellular Smad effector proteins. BMP signaling is precisely regulated and perturbation of BMP signaling is connected to multiple diseases, including musculoskeletal diseases. In this review, we will summarize the recent progress in elucidation of BMP signal transduction, how overactive BMP signaling is involved in the pathogenesis of heterotopic ossification and Duchenne muscular dystrophy, and discuss possible therapeutic strategies for treatment of these diseases.
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198
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Guillot N, Kollins D, Gilbert V, Xavier S, Chen J, Gentle M, Reddy A, Bottinger E, Jiang R, Rastaldi MP, Corbelli A, Schlondorff D. BAMBI regulates angiogenesis and endothelial homeostasis through modulation of alternative TGFβ signaling. PLoS One 2012; 7:e39406. [PMID: 22761782 PMCID: PMC3382616 DOI: 10.1371/journal.pone.0039406] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2012] [Accepted: 05/24/2012] [Indexed: 01/22/2023] Open
Abstract
BACKGROUND BAMBI is a type I TGFβ receptor antagonist, whose in vivo function remains unclear, as BAMBI(-/-) mice lack an obvious phenotype. METHODOLOGY/PRINCIPAL FINDINGS Identifying BAMBI's functions requires identification of cell-specific expression of BAMBI. By immunohistology we found BAMBI expression restricted to endothelial cells and by electron microscopy BAMBI(-/-) mice showed prominent and swollen endothelial cells in myocardial and glomerular capillaries. In endothelial cells over-expression of BAMBI reduced, whereas knock-down enhanced capillary growth and migration in response to TGFβ. In vivo angiogenesis was enhanced in matrigel implants and in glomerular hypertrophy after unilateral nephrectomy in BAMBI(-/-) compared to BAMBI(+/+) mice consistent with an endothelial phenotype for BAMBI(-/-) mice. BAMBI's mechanism of action in endothelial cells was examined by canonical and alternative TGFβ signaling in HUVEC with over-expression or knock-down of BAMBI. BAMBI knockdown enhanced basal and TGFβ stimulated SMAD1/5 and ERK1/2 phosphorylation, while over-expression prevented both. CONCLUSIONS/SIGNIFICANCE Thus we provide a first description of a vascular phenotype for BAMBI(-/-) mice, and provide in vitro and in vivo evidence that BAMBI contributes to endothelial and vascular homeostasis. Further, we demonstrate that in endothelial cells BAMBI interferes with alternative TGFβ signaling, most likely through the ALK 1 receptor, which may explain the phenotype observed in BAMBI(-/-) mice. This newly described role for BAMBI in regulating endothelial function has potential implications for understanding and treating vascular disease and tumor neo-angiogenesis.
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Affiliation(s)
- Nicolas Guillot
- Department of Medicine, Mount Sinai School of Medicine, New York, New York, United States of America
| | - Dmitrij Kollins
- Department of Medicine, Mount Sinai School of Medicine, New York, New York, United States of America
| | - Victoria Gilbert
- Department of Medicine, Mount Sinai School of Medicine, New York, New York, United States of America
| | - Sandhya Xavier
- Department of Medicine, New York Medical College, Valhalla, New York, United States of America
| | - Jun Chen
- Department of Medicine, New York Medical College, Valhalla, New York, United States of America
| | - Madeleine Gentle
- Department of Medicine, Mount Sinai School of Medicine, New York, New York, United States of America
| | - Anand Reddy
- Department of Medicine, Mount Sinai School of Medicine, New York, New York, United States of America
| | - Erwin Bottinger
- Department of Medicine, Mount Sinai School of Medicine, New York, New York, United States of America
| | - Rulang Jiang
- Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, United States of America
| | - Maria Pia Rastaldi
- Renal Research Laboratory, Ospedale Maggior Policlinico & Fondazione D’Amico per la Ricerca sulle Malattie Renali, Milan, Italy
| | - Alessandro Corbelli
- Renal Research Laboratory, Ospedale Maggior Policlinico & Fondazione D’Amico per la Ricerca sulle Malattie Renali, Milan, Italy
| | - Detlef Schlondorff
- Department of Medicine, Mount Sinai School of Medicine, New York, New York, United States of America
- * E-mail:
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Neely MD, Litt MJ, Tidball AM, Li GG, Aboud AA, Hopkins CR, Chamberlin R, Hong CC, Ess KC, Bowman AB. DMH1, a highly selective small molecule BMP inhibitor promotes neurogenesis of hiPSCs: comparison of PAX6 and SOX1 expression during neural induction. ACS Chem Neurosci 2012; 3:482-91. [PMID: 22860217 DOI: 10.1021/cn300029t] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Accepted: 03/05/2012] [Indexed: 12/25/2022] Open
Abstract
Recent successes in deriving human-induced pluripotent stem cells (hiPSCs) allow for the possibility of studying human neurons derived from patients with neurological diseases. Concomitant inhibition of the BMP and TGF-β1 branches of the TGF-β signaling pathways by the endogenous antagonist, Noggin, and the small molecule SB431542, respectively, induces efficient neuralization of hiPSCs, a method known as dual-SMAD inhibition. The use of small molecule inhibitors instead of their endogenous counterparts has several advantages including lower cost, consistent activity, and the maintenance of xeno-free culture conditions. We tested the efficacy of DMH1, a highly selective small molecule BMP-inhibitor for its potential to replace Noggin in the neuralization of hiPSCs. We compare Noggin and DMH1-induced neuralization of hiPSCs by measuring protein and mRNA levels of pluripotency and neural precursor markers over a period of seven days. The regulation of five of the six markers assessed was indistinguishable in the presence of concentrations of Noggin or DMH1 that have been shown to effectively inhibit BMP signaling in other systems. We observed that by varying the DMH1 or Noggin concentration, we could selectively modulate the number of SOX1 expressing cells, whereas PAX6, another neural precursor marker, remained the same. The level and timing of SOX1 expression have been shown to affect neural induction as well as neural lineage. Our observations, therefore, suggest that BMP-inhibitor concentrations need to be carefully monitored to ensure appropriate expression levels of all transcription factors necessary for the induction of a particular neuronal lineage. We further demonstrate that DMH1-induced neural progenitors can be differentiated into β3-tubulin expressing neurons, a subset of which also express tyrosine hydroxylase. Thus, the combined use of DMH1, a highly specific BMP-pathway inhibitor, and SB431542, a TGF-β1-pathway specific inhibitor, provides us with the tools to independently regulate these two pathways through the exclusive use of small molecule inhibitors.
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Affiliation(s)
| | | | | | | | | | | | - Reed Chamberlin
- Genetics Associates Inc., Nashville, Tennessee 37203, United States
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Abstract
AMPK (AMP-activated protein kinase) is one of the key players in maintaining intracellular homoeostasis. AMPK is well known as an energy sensor and can be activated by increased intracellular AMP levels. Generally, the activation of AMPK turns on catabolic pathways that generate ATP, while inhibiting cell proliferation and biosynthetic processes that consume ATP. In recent years, intensive investigations on the regulation and the function of AMPK indicates that AMPK not only functions as an intracellular energy sensor and regulator, but is also a general stress sensor that is important in maintaining intracellular homoeostasis during many kinds of stress challenges. In the present paper, we will review recent literature showing that AMPK functions far beyond its proposed energy sensor and regulator function. AMPK regulates ROS (reactive oxygen species)/redox balance, autophagy, cell proliferation, cell apoptosis, cellular polarity, mitochondrial function and genotoxic response, either directly or indirectly via numerous downstream pathways under physiological and pathological conditions.
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