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Skauli N, Savchenko E, Ottersen OP, Roybon L, Amiry-Moghaddam M. Canonical Bone Morphogenetic Protein Signaling Regulates Expression of Aquaporin-4 and Its Anchoring Complex in Mouse Astrocytes. Front Cell Neurosci 2022; 16:878154. [PMID: 35518645 PMCID: PMC9067306 DOI: 10.3389/fncel.2022.878154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Accepted: 03/22/2022] [Indexed: 11/13/2022] Open
Abstract
Aquaporin-4 (AQP4) is the predominant water channel in the brain; it is enriched in astrocytic foot processes abutting vessels where it is anchored through an interaction with the dystrophin-associated protein (DAP) complex. Enhanced expression with concomitant mislocalization of AQP4 along astrocyte plasma membranes is a hallmark of several neurological conditions. Thus, there is an urgent need to identify which signaling pathways dictate AQP4 microdistribution. Here we show that canonical bone morphogenetic proteins (BMPs), particularly BMP2 and 4, upregulate AQP4 expression in astrocytes and dysregulate the associated DAP complex by differentially affecting its individual members. We further demonstrate the presence of BMP receptors and Smad1/5/9 pathway activation in BMP treated astrocytes. Our analysis of adult mouse brain reveals BMP2 and 4 in neurons and in a subclass of endothelial cells and activated Smad1/5/9 in astrocytes. We conclude that the canonical BMP-signaling pathway might be responsible for regulating the expression of AQP4 and of DAP complex proteins that govern the subcellular compartmentation of this aquaporin.
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Affiliation(s)
- Nadia Skauli
- Division of Anatomy, Department of Molecular Medicine, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
| | - Ekaterina Savchenko
- Stem Cell Laboratory for CNS Disease Modeling, Department of Experimental Medical Science, BMC D10, Lund University, Lund, Sweden
| | - Ole Petter Ottersen
- Division of Anatomy, Department of Molecular Medicine, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway.,Karolinska Institutet, Stockholm, Sweden
| | - Laurent Roybon
- Stem Cell Laboratory for CNS Disease Modeling, Department of Experimental Medical Science, BMC D10, Lund University, Lund, Sweden
| | - Mahmood Amiry-Moghaddam
- Division of Anatomy, Department of Molecular Medicine, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
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2
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Kim HS, Kim Y, Lim MJ, Park YG, Park SI, Sohn J. The p38‐activated ER stress‐ATF6α axis mediates cellular senescence. FASEB J 2018; 33:2422-2434. [DOI: 10.1096/fj.201800836r] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Hee Suk Kim
- Department of Biochemistry and Molecular BiologyKorea University College of MedicineSeoulSouth Korea
- Korea Institute of Molecular Medicine and NutritionSeoulSouth Korea
| | - Yongjin Kim
- Department of Biochemistry and Molecular BiologyKorea University College of MedicineSeoulSouth Korea
- Korea Institute of Molecular Medicine and NutritionSeoulSouth Korea
| | - Min Jae Lim
- Department of Biochemistry and Molecular BiologyKorea University College of MedicineSeoulSouth Korea
- Korea Institute of Molecular Medicine and NutritionSeoulSouth Korea
| | - Yun-Gyu Park
- Department of Biochemistry and Molecular BiologyKorea University College of MedicineSeoulSouth Korea
- Korea Institute of Molecular Medicine and NutritionSeoulSouth Korea
| | - Serk In Park
- Department of Biochemistry and Molecular BiologyKorea University College of MedicineSeoulSouth Korea
- Korea Institute of Molecular Medicine and NutritionSeoulSouth Korea
| | - Jeongwon Sohn
- Department of Biochemistry and Molecular BiologyKorea University College of MedicineSeoulSouth Korea
- Korea Institute of Molecular Medicine and NutritionSeoulSouth Korea
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3
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Fujita Y, Tominaga T, Abe H, Kangawa Y, Fukushima N, Ueda O, Jishage KI, Kishi S, Murakami T, Saga Y, Kanwar YS, Nagai K, Doi T. An adjustment in BMP4 function represents a treatment for diabetic nephropathy and podocyte injury. Sci Rep 2018; 8:13011. [PMID: 30158674 PMCID: PMC6115362 DOI: 10.1038/s41598-018-31464-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Accepted: 07/09/2018] [Indexed: 01/03/2023] Open
Abstract
Podocyte injury has been proposed to play an important role in diabetic nephropathy; however, its pathological mechanism remains unclear. We have shown that bone morphogenetic protein 4 (BMP4) signaling leads to the glomerular changes characteristic of this disorder. To analyze the molecular mechanism of podocyte injury, the effect of BMP4 was investigated using streptozotocin (STZ)-induced, Bmp4 heterozygous knockout (Bmp4+/−) and podocyte-specific Bmp4 knockout mice. Mice with STZ-induced diabetes exhibited glomerular matrix hyperplasia and decreased numbers of podocyte nucleus-specific WT1-positive cells. The number of podocytes and proteinuria were improved in both diabetic Bmp4 knockout mouse models compared to the effects observed in the control mice. The effect of BMP4 overexpression on Bmp4-induced or podocyte-specific transgenic mice was examined. Tamoxifen-induced Bmp4-overexpressing mice exhibited mesangial matrix expansion and decreased numbers of WT1-positive cells. Podocyte-specific Bmp4-overexpressing mice displayed increased kidney BMP4 expression and mesangial matrix expansion but decreased nephrin expression and numbers of WT1-positive cells. Both lines of Bmp4-overexpressing mice exhibited increased albuminuria. In cultured podocytes, BMP4 increased phospho-p38 levels. BMP4 decreased nephrin expression but increased cleaved caspase-3 levels. p38 suppression inhibited caspase-3 activation. Apoptosis was confirmed in STZ-diabetic glomeruli and Bmp4-overexpressing mice. Bmp4 +/− mice with diabetes displayed reduced apoptosis. Based on these data, the BMP4 signaling pathway plays important roles in the development of both podocyte injury and mesangial matrix expansion in diabetic nephropathy.
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Affiliation(s)
- Yui Fujita
- Department of Nephrology, Graduate School of Biomedical Science, Tokushima University, Tokushima, Japan
| | - Tatsuya Tominaga
- Department of Nephrology, Graduate School of Biomedical Science, Tokushima University, Tokushima, Japan.
| | - Hideharu Abe
- Department of Nephrology, Graduate School of Biomedical Science, Tokushima University, Tokushima, Japan
| | - Yumi Kangawa
- Department of Nephrology, Graduate School of Biomedical Science, Tokushima University, Tokushima, Japan
| | - Naoshi Fukushima
- Research Division, Fuji Gotemba Research Labs, Chugai Pharmaceutical Co., Ltd, Shizuoka, Japan
| | - Otoya Ueda
- Research Division, Fuji Gotemba Research Labs, Chugai Pharmaceutical Co., Ltd, Shizuoka, Japan
| | - Kou-Ichi Jishage
- Research Division, Fuji Gotemba Research Labs, Chugai Pharmaceutical Co., Ltd, Shizuoka, Japan.,Chugai Research Institute for Medical Science Inc., Shizuoka, Japan
| | - Seiji Kishi
- Department of Nephrology, Graduate School of Biomedical Science, Tokushima University, Tokushima, Japan
| | - Taichi Murakami
- Department of Nephrology, Graduate School of Biomedical Science, Tokushima University, Tokushima, Japan
| | - Yumiko Saga
- Division of Mammalian Development, Genetic Strains Research Center, National Institute of Genetics, Mishima, Shizuoka, Japan
| | - Yashpal S Kanwar
- Department of Pathology & Medicine-Nephrology, FSM, Northwestern University, Chicago, Illinois, 60611, USA
| | - Kojiro Nagai
- Department of Nephrology, Graduate School of Biomedical Science, Tokushima University, Tokushima, Japan
| | - Toshio Doi
- Department of Nephrology, Graduate School of Biomedical Science, Tokushima University, Tokushima, Japan
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Decrease of FSTL1-BMP4-Smad signaling predicts poor prognosis in lung adenocarcinoma but not in squamous cell carcinoma. Sci Rep 2017; 7:9830. [PMID: 28852126 PMCID: PMC5575295 DOI: 10.1038/s41598-017-10366-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Accepted: 08/09/2017] [Indexed: 11/09/2022] Open
Abstract
Follistatin-related protein 1 (FSTL1) plays a critical role in lung development through regulating BMP4-p-Smad1/5/8-Smad4 pathway. Regarding that many developmental pathways in embryogenesis are dysregulated in cancer, we aim to unravel the role of FSTL1-BMP4-Smad pathway in lung cancer. Our results showed low FSTL1 immunoexpression was significantly correlated with poor prognosis while patients with low BMP4 or low Smad4 immunoexpression showed a trend toward poor prognosis. When stratified by different histological types, low FSTL1, BMP4, and Smad4 expression retained their trends in predicting poor prognosis in lung adenocarcinoma (LUAD) but not in lung squamous cell carcinoma (SCC). Low FSTL1, BMP4, and Smad4 expression were more frequently observed in LUAD patients with smoking history. To determine smoking effect on FSTL1, normal cell BEAS2B and lung cancer cell lines was treated with nicotine and the results showed nicotine increased the proliferation of these cells. Interestingly, FSTL1 attenuated nicotine-induced BEAS2B and lung cancer cell line proliferation. Altogether, low FSTL1, BMP4, and Smad4 expression significantly correlated with poor prognosis in LUAD but not in SCC. Frequent decrease of FSTL1 expression in smokers LUAD further indicates its importance and therapeutic potential for lung cancer patients with specific subtypes. FSTL1 may prevent nicotine-induced lung cancer cell proliferation.
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Lu R, Mucaki EJ, Rogan PK. Discovery and validation of information theory-based transcription factor and cofactor binding site motifs. Nucleic Acids Res 2017; 45:e27. [PMID: 27899659 PMCID: PMC5389469 DOI: 10.1093/nar/gkw1036] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Accepted: 10/19/2016] [Indexed: 02/06/2023] Open
Abstract
Data from ChIP-seq experiments can derive the genome-wide binding specificities of transcription factors (TFs) and other regulatory proteins. We analyzed 765 ENCODE ChIP-seq peak datasets of 207 human TFs with a novel motif discovery pipeline based on recursive, thresholded entropy minimization. This approach, while obviating the need to compensate for skewed nucleotide composition, distinguishes true binding motifs from noise, quantifies the strengths of individual binding sites based on computed affinity and detects adjacent cofactor binding sites that coordinate with the targets of primary, immunoprecipitated TFs. We obtained contiguous and bipartite information theory-based position weight matrices (iPWMs) for 93 sequence-specific TFs, discovered 23 cofactor motifs for 127 TFs and revealed six high-confidence novel motifs. The reliability and accuracy of these iPWMs were determined via four independent validation methods, including the detection of experimentally proven binding sites, explanation of effects of characterized SNPs, comparison with previously published motifs and statistical analyses. We also predict previously unreported TF coregulatory interactions (e.g. TF complexes). These iPWMs constitute a powerful tool for predicting the effects of sequence variants in known binding sites, performing mutation analysis on regulatory SNPs and predicting previously unrecognized binding sites and target genes.
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Affiliation(s)
- Ruipeng Lu
- Department of Computer Science, Western University, London, Ontario, N6A 5B7, Canada
| | - Eliseos J Mucaki
- Department of Biochemistry, Western University, London, Ontario, N6A 5C1, Canada
| | - Peter K Rogan
- Department of Computer Science, Western University, London, Ontario, N6A 5B7, Canada.,Department of Biochemistry, Western University, London, Ontario, N6A 5C1, Canada.,Department of Oncology, Western University, London, Ontario, N6A 4L6, Canada.,Cytognomix Inc., London, Ontario, N5X 3X5, Canada
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6
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TGF-β Family Signaling in the Control of Cell Proliferation and Survival. Cold Spring Harb Perspect Biol 2017; 9:cshperspect.a022145. [PMID: 27920038 DOI: 10.1101/cshperspect.a022145] [Citation(s) in RCA: 373] [Impact Index Per Article: 53.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The transforming growth factor β (TGF-β) family controls many fundamental aspects of cellular behavior. With advances in the molecular details of the TGF-β signaling cascade and its cross talk with other signaling pathways, we now have a more coherent understanding of the cytostatic program induced by TGF-β. However, the molecular mechanisms are still largely elusive for other cellular processes that are regulated by TGF-β and determine a cell's proliferation and survival, apoptosis, dormancy, autophagy, and senescence. The difficulty in defining TGF-β's roles partly stems from the context-dependent nature of TGF-β signaling. Here, we review our current understanding and recent progress on the biological effects of TGF-β at the cellular level, with the hope of providing a framework for understanding how cells respond to TGF-β signals in specific contexts, and why disruption of such mechanisms may result in different human diseases including cancer.
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Wu Q, Jiang D, Matsuda JL, Ternyak K, Zhang B, Chu HW. Cigarette Smoke Induces Human Airway Epithelial Senescence via Growth Differentiation Factor 15 Production. Am J Respir Cell Mol Biol 2016; 55:429-38. [DOI: 10.1165/rcmb.2015-0143oc] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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8
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Zhou Y, Ino K, Shiku H, Matsue T. Evaluation of senescence in individual MCF-7 spheroids based on electrochemical measurement of senescence-associated β-galactosidase activity. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.10.115] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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9
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Zhang Y, Wang S, Liu S, Li C, Wang J. Role of Smad signaling in kidney disease. Int Urol Nephrol 2015; 47:1965-75. [DOI: 10.1007/s11255-015-1115-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 09/18/2015] [Indexed: 01/21/2023]
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10
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Zhou Y, Zhang X, Klibanski A. Genetic and epigenetic mutations of tumor suppressive genes in sporadic pituitary adenoma. Mol Cell Endocrinol 2014; 386:16-33. [PMID: 24035864 PMCID: PMC3943596 DOI: 10.1016/j.mce.2013.09.006] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Accepted: 09/03/2013] [Indexed: 12/28/2022]
Abstract
Human pituitary adenomas are the most common intracranial neoplasms. Approximately 5% of them are familial adenomas. Patients with familial tumors carry germline mutations in predisposition genes, including AIP, MEN1 and PRKAR1A. These mutations are extremely rare in sporadic pituitary adenomas, which therefore are caused by different mechanisms. Multiple tumor suppressive genes linked to sporadic tumors have been identified. Their inactivation is caused by epigenetic mechanisms, mainly promoter hypermethylation, and can be placed into two groups based on their functional interaction with tumor suppressors RB or p53. The RB group includes CDKN2A, CDKN2B, CDKN2C, RB1, BMP4, CDH1, CDH13, GADD45B and GADD45G; AIP and MEN1 genes also belong to this group. The p53 group includes MEG3, MGMT, PLAGL1, RASSF1, RASSF3 and SOCS1. We propose that the tumor suppression function of these genes is mainly mediated by the RB and p53 pathways. We also discuss possible tumor suppression mechanisms for individual genes.
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Affiliation(s)
- Yunli Zhou
- Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, United States
| | - Xun Zhang
- Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, United States
| | - Anne Klibanski
- Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, United States.
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11
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Shao L, Wang L, Wei Z, Xiong Y, Wang Y, Tang K, Li Y, Feng G, Xing Q, He L. Dynamic network of transcription and pathway crosstalk to reveal molecular mechanism of MGd-treated human lung cancer cells. PLoS One 2012; 7:e31984. [PMID: 22693540 PMCID: PMC3365074 DOI: 10.1371/journal.pone.0031984] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2011] [Accepted: 01/16/2012] [Indexed: 01/16/2023] Open
Abstract
Recent research has revealed various molecular markers in lung cancer. However, the organizational principles underlying their genetic regulatory networks still await investigation. Here we performed Network Component Analysis (NCA) and Pathway Crosstalk Analysis (PCA) to construct a regulatory network in human lung cancer (A549) cells which were treated with 50 uM motexafin gadolinium (MGd), a metal cation-containing chemotherapeutic drug for 4, 12, and 24 hours. We identified a set of key TFs, known target genes for these TFs, and signaling pathways involved in regulatory networks. Our work showed that putative interactions between these TFs (such as ESR1/Sp1, E2F1/Sp1, c-MYC-ESR, Smad3/c-Myc, and NFKB1/RELA), between TFs and their target genes (such as BMP41/Est1, TSC2/Myc, APE1/Sp1/p53, RARA/HOXA1, and SP1/USF2), and between signaling pathways (such as PPAR signaling pathway and Adipocytokines signaling pathway). These results will provide insights into the regulatory mechanism of MGd-treated human lung cancer cells.
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Affiliation(s)
- Liyan Shao
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China
| | - Lishan Wang
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China
| | - Zhiyun Wei
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China
| | - Yuyu Xiong
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China
| | - Yang Wang
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China
| | - Kefu Tang
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China
| | - Yang Li
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China
| | - Guoyin Feng
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China
| | - Qinghe Xing
- Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - Lin He
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China
- Institute for Nutritional Sciences, Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai, China
- Institutes of Biomedical Sciences, Fudan University, Shanghai, China
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Park JES, Shao D, Upton PD, deSouza P, Adcock IM, Davies RJ, Morrell NW, Griffiths MJD, Wort SJ. BMP-9 induced endothelial cell tubule formation and inhibition of migration involves Smad1 driven endothelin-1 production. PLoS One 2012; 7:e30075. [PMID: 22299030 PMCID: PMC3267722 DOI: 10.1371/journal.pone.0030075] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Accepted: 12/12/2011] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Bone morphogenetic proteins (BMPs) and their receptors, such as bone morphogenetic protein receptor (BMPR) II, have been implicated in a wide variety of disorders including pulmonary arterial hypertension (PAH). Similarly, endothelin-1 (ET-1), a mitogen and vasoconstrictor, is upregulated in PAH and endothelin receptor antagonists are used in its treatment. We sought to determine whether there is crosstalk between BMP signalling and the ET-1 axis in human pulmonary artery endothelial cells (HPAECs), possible mechanisms involved in such crosstalk and functional consequences thereof. METHODOLOGY/PRINCIPAL FINDING Using western blot, real time RT-PCR, ELISA and small RNA interference methods we provide evidence that in HPAECs BMP-9, but not BMP-2, -4 and -6 significantly stimulated ET-1 release under physiological concentrations. This release is mediated by both Smad1 and p38 MAPK and is independent of the canonical Smad4 pathway. Moreover, knocking down the ALK1 receptor or BMPR II attenuates BMP-9 stimulated ET-1 release, whilst causing a significant increase in prepro ET-1 mRNA transcription and mature peptide release. Finally, BMP-9 induced ET-1 release is involved in both inhibition of endothelial cell migration and promotion of tubule formation. CONCLUSIONS/SIGNIFICANCE Although our data does not support an important role for BMP-9 as a source of increased endothelial ET-1 production seen in human PAH, BMP-9 stimulated ET-1 production is likely to be important in angiogenesis and vascular stability. However, increased ET-1 production by endothelial cells as a consequence of BMPR II dysfunction may be clinically relevant in the pathogenesis of PAH.
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Affiliation(s)
- John E. S. Park
- Unit of Critical Care, Royal Brompton Hospital, National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, United Kingdom
| | - Dongmin Shao
- Unit of Critical Care, Royal Brompton Hospital, National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, United Kingdom
| | - Paul D. Upton
- Department of Medicine, School of Clinical Medicine, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom
| | - Patricia deSouza
- Unit of Critical Care, Royal Brompton Hospital, National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, United Kingdom
| | - Ian M. Adcock
- Airways Disease Section, National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, United Kingdom
| | - Rachel J. Davies
- Department of Medicine, School of Clinical Medicine, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom
| | - Nicholas W. Morrell
- Department of Medicine, School of Clinical Medicine, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom
| | - Mark J. D. Griffiths
- Unit of Critical Care, Royal Brompton Hospital, National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, United Kingdom
| | - Stephen J. Wort
- Unit of Critical Care, Royal Brompton Hospital, National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, United Kingdom
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Lee JS, Ha L, Park JH, Lim JY. Mechanical stretch suppresses BMP4 induction of stem cell adipogenesis via upregulating ERK but not through downregulating Smad or p38. Biochem Biophys Res Commun 2012; 418:278-83. [PMID: 22266311 DOI: 10.1016/j.bbrc.2012.01.010] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2012] [Accepted: 01/04/2012] [Indexed: 11/28/2022]
Abstract
Bone morphogenetic proteins (BMPs) are also implicated in the commitment of mesenchymal stem cells (MSCs) toward adipocytes. We tested that stretching of cells may downregulate BMP4 induction of MSC adipogenesis. C3H10T1/2 MSCs were pretreated with BMP4 and induced to differentiate to adipocytes using adipogenic hormonal inducers. To test the stretch effect on BMP4 function, cells were exposed to cyclic tensile stretch (10% strain, 0.25Hz, 120min/day) during the BMP4 pretreatment period. BMP4 induced MSC adipocytic commitment. Stretching during the BMP4 exposure could suppress BMP4 induction of MSC adipogenesis, as assessed by downregulated adipogenic transcription factors (PPARγ, C/EBPα, aP2) and decreased lipid accumulation. BMP4 signaled through Smad1/5/8 and p38MAPK, whereas cell stretch did not affect BMP4-induced activation in Smad or p38. On the other hand, cell stretch triggered significant ERK1/2 phosphorylation relative to BMP4 treatment alone cells. Further, stretch suppression of BMP4-induced MSC adipogenesis was significantly deteriorated if cells were stretched with ERK blocked by PD98059. Combined, these suggest that cell stretch suppresses the BMP4 induction of MSC adipogenesis potentially via upregulating ERK but not through the downregulation of Smad or p38. Our data on inhibiting MSC adipogenesis will be of significant interest for obesity and developmental mechanobiology studies.
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Affiliation(s)
- Jeong Soon Lee
- Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
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