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Ueharu H, Mishina Y. BMP signaling during craniofacial development: new insights into pathological mechanisms leading to craniofacial anomalies. Front Physiol 2023; 14:1170511. [PMID: 37275223 PMCID: PMC10232782 DOI: 10.3389/fphys.2023.1170511] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 05/10/2023] [Indexed: 06/07/2023] Open
Abstract
Cranial neural crest cells (NCCs) are the origin of the anterior part of the face and the head. Cranial NCCs are multipotent cells giving rise to bones, cartilage, adipose-tissues in the face, and neural cells, melanocytes, and others. The behavior of cranial NCCs (proliferation, cell death, migration, differentiation, and cell fate specification) are well regulated by several signaling pathways; abnormalities in their behavior are often reported as causative reasons for craniofacial anomalies (CFAs), which occur in 1 in 100 newborns in the United States. Understanding the pathological mechanisms of CFAs would facilitate strategies for identifying, preventing, and treating CFAs. Bone morphogenetic protein (BMP) signaling plays a pleiotropic role in many cellular processes during embryonic development. We and others have reported that abnormalities in BMP signaling in cranial NCCs develop CFAs in mice. Abnormal levels of BMP signaling cause miscorrelation with other signaling pathways such as Wnt signaling and FGF signaling, which mutations in the signaling pathways are known to develop CFAs in mice and humans. Recent Genome-Wide Association Studies and exome sequencing demonstrated that some patients with CFAs presented single nucleotide polymorphisms (SNPs), missense mutations, and duplication of genes related to BMP signaling activities, suggesting that defects in abnormal BMP signaling in human embryos develop CFAs. There are still a few cases of BMP-related patients with CFAs. One speculation is that human embryos with mutations in coding regions of BMP-related genes undergo embryonic lethality before developing the craniofacial region as well as mice development; however, no reports are available that show embryonic lethality caused by BMP mutations in humans. In this review, we will summarize the recent advances in the understanding of BMP signaling during craniofacial development in mice and describe how we can translate the knowledge from the transgenic mice to CFAs in humans.
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Omi M, Koneru T, Lyu Y, Haraguchi A, Kamiya N, Mishina Y. Increased BMP-Smad signaling does not affect net bone mass in long bones. Front Physiol 2023; 14:1145763. [PMID: 37064883 PMCID: PMC10101206 DOI: 10.3389/fphys.2023.1145763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 03/21/2023] [Indexed: 04/03/2023] Open
Abstract
Bone morphogenetic proteins (BMPs) have been used for orthopedic and dental application due to their osteoinductive properties; however, substantial numbers of adverse reactions such as heterotopic bone formation, increased bone resorption and greater cancer risk have been reported. Since bone morphogenetic proteins signaling exerts pleiotropic effects on various tissues, it is crucial to understand tissue-specific and context-dependent functions of bone morphogenetic proteins. We previously reported that loss-of-function of bone morphogenetic proteins receptor type IA (BMPR1A) in osteoblasts leads to more bone mass in mice partly due to inhibition of bone resorption, indicating that bone morphogenetic protein signaling in osteoblasts promotes osteoclast function. On the other hand, hemizygous constitutively active (ca) mutations for BMPR1A (caBmpr1awt/+) in osteoblasts result in higher bone morphogenetic protein signaling activity and no overt skeletal changes in adult mice. Here, we further bred mice for heterozygous null for Bmpr1a (Bmpr1a+/−) and homozygous mutations of caBmpr1a (caBmpr1a+/+) crossed with Osterix-Cre transgenic mice to understand how differences in the levels of bone morphogenetic protein signaling activity specifically in osteoblasts contribute to bone phenotype. We found that Bmpr1a+/−, caBmpr1awt/+ and caBmpr1a+/+ mice at 3 months of age showed no overt bone phenotypes in tibiae compared to controls by micro-CT and histological analysis although BMP-Smad signaling is increased in both caBmpr1awt/+ and caBmpr1a+/+ tibiae and decreased in the Bmpr1a+/− mice compared to controls. Gene expression analysis demonstrated that slightly higher levels of bone formation markers and resorption markers along with levels of bone morphogenetic protein-Smad signaling, however, there was no significant changes in TRAP positive cells in tibiae. These findings suggest that changes in bone morphogenetic protein signaling activity within differentiating osteoblasts does not affect net bone mass in the adult stage, providing insights into the concerns in the clinical setting such as high-dose and unexpected side effects of bone morphogenetic protein application.
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Affiliation(s)
- Maiko Omi
- Department of Biologic and Materials Sciences and Prosthodontics, University of Michigan School of Dentistry, Ann Arbor, MI, United States
| | - Tejaswi Koneru
- Department of Biologic and Materials Sciences and Prosthodontics, University of Michigan School of Dentistry, Ann Arbor, MI, United States
| | - Yishan Lyu
- Department of Biologic and Materials Sciences and Prosthodontics, University of Michigan School of Dentistry, Ann Arbor, MI, United States
| | - Ai Haraguchi
- Department of Biologic and Materials Sciences and Prosthodontics, University of Michigan School of Dentistry, Ann Arbor, MI, United States
| | - Nobuhiro Kamiya
- Department of Budo and Sport Studies, Faculty of Budo and Sport Studies, Tenri University, Nara, Japan
| | - Yuji Mishina
- Department of Biologic and Materials Sciences and Prosthodontics, University of Michigan School of Dentistry, Ann Arbor, MI, United States
- *Correspondence: Yuji Mishina,
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Ueharu H, Pan H, Hayano S, Zapien-Guerra K, Yang J, Mishina Y. Augmentation of bone morphogenetic protein signaling in cranial neural crest cells in mice deforms skull base due to premature fusion of intersphenoidal synchondrosis. Genesis 2023; 61:e23509. [PMID: 36622051 PMCID: PMC10757424 DOI: 10.1002/dvg.23509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Revised: 12/20/2022] [Accepted: 12/27/2022] [Indexed: 01/10/2023]
Abstract
Craniofacial anomalies (CFAs) are a diverse group of disorders affecting the shapes of the face and the head. Malformation of the cranial base in humans leads CFAs, such as midfacial hypoplasia and craniosynostosis. These patients have significant burdens associated with breathing, speaking, and chewing. Invasive surgical intervention is the current primary option to correct these structural deficiencies. Understanding molecular cellular mechanism for craniofacial development would provide novel therapeutic options for CFAs. In this study, we found that enhanced bone morphogenetic protein (BMP) signaling in cranial neural crest cells (NCCs) (P0-Cre;caBmpr1a mice) causes premature fusion of intersphenoid synchondrosis (ISS) resulting in leading to short snouts and hypertelorism. Histological analyses revealed reduction of proliferation and higher cell death in ISS at postnatal day 3. We demonstrated to prevent the premature fusion of ISS in P0-Cre;caBmpr1a mice by injecting a p53 inhibitor Pifithrin-α to the pregnant mother from E15.5 to E18.5, resulting in rescue from short snouts and hypertelorism. We further demonstrated to prevent premature fusion of cranial sutures in P0-Cre;caBmpr1a mice by injecting Pifithrin-α through E8.5 to E18.5. These results suggested that enhanced BMP-p53-induced cell death in cranial NCCs causes premature fusion of ISS and sutures in time-dependent manner.
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Affiliation(s)
- Hiroki Ueharu
- Department of Biologic and Materials Sciences, School of Dentistry, University Michigan, Ann Arbor, Michigan, USA
| | - Haichun Pan
- Department of Biologic and Materials Sciences, School of Dentistry, University Michigan, Ann Arbor, Michigan, USA
| | - Satoru Hayano
- Department of Orthodontics, Okayama University Hospital, Okayama, Japan
| | - Karen Zapien-Guerra
- Department of Biologic and Materials Sciences, School of Dentistry, University Michigan, Ann Arbor, Michigan, USA
| | - Jingwen Yang
- Department of Biologic and Materials Sciences, School of Dentistry, University Michigan, Ann Arbor, Michigan, USA
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Yuji Mishina
- Department of Biologic and Materials Sciences, School of Dentistry, University Michigan, Ann Arbor, Michigan, USA
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Yamamoto M, Stoessel SJ, Yamamoto S, Goldhamer DJ. Overexpression of Wild-Type ACVR1 in Fibrodysplasia Ossificans Progressiva Mice Rescues Perinatal Lethality and Inhibits Heterotopic Ossification. J Bone Miner Res 2022; 37:2077-2093. [PMID: 35637634 PMCID: PMC9708949 DOI: 10.1002/jbmr.4617] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 04/22/2022] [Accepted: 05/28/2022] [Indexed: 11/07/2022]
Abstract
Fibrodysplasia ossificans progressiva (FOP) is a devastating disease of progressive heterotopic bone formation for which effective treatments are currently unavailable. FOP is caused by dominant gain-of-function mutations in the receptor ACVR1 (also known as ALK2), which render the receptor inappropriately responsive to activin ligands. In previous studies, we developed a genetic mouse model of FOP that recapitulates most clinical aspects of the disease. In this model, genetic loss of the wild-type Acvr1 allele profoundly exacerbated heterotopic ossification, suggesting the hypothesis that the stoichiometry of wild-type and mutant receptors dictates disease severity. Here, we tested this model by producing FOP mice that conditionally overexpress human wild-type ACVR1. Injury-induced heterotopic ossification (HO) was completely blocked in FOP mice when expression of both the mutant and wild-type receptor were targeted to Tie2-positive cells, which includes fibro/adipogenic progenitors (FAPs). Perinatal lethality of Acvr1R206H/+ mice was rescued by constitutive ACVR1 overexpression, and these mice survived to adulthood at predicted Mendelian frequencies. Constitutive overexpression of ACVR1 also provided protection from spontaneous abnormal skeletogenesis, and the incidence and severity of injury-induced HO in these mice was dramatically reduced. Analysis of pSMAD1/5/8 signaling both in cultured cells and in vivo indicates that ACVR1 overexpression functions cell-autonomously by reducing osteogenic signaling in response to activin A. We propose that ACVR1 overexpression inhibits HO by decreasing the abundance of ACVR1(R206H)-containing signaling complexes at the cell surface while increasing the representation of activin-A-bound non-signaling complexes comprised of wild-type ACVR1. © 2022 The Authors. Journal of Bone and Mineral Research published by Wiley Periodicals LLC on behalf of American Society for Bone and Mineral Research (ASBMR).
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Affiliation(s)
- Masakazu Yamamoto
- Department of Molecular and Cell BiologyUniversity of Connecticut Stem Cell Institute, University of ConnecticutStorrsCTUSA
| | - Sean J Stoessel
- Department of Molecular and Cell BiologyUniversity of Connecticut Stem Cell Institute, University of ConnecticutStorrsCTUSA
| | - Shoko Yamamoto
- Department of Molecular and Cell BiologyUniversity of Connecticut Stem Cell Institute, University of ConnecticutStorrsCTUSA
| | - David J Goldhamer
- Department of Molecular and Cell BiologyUniversity of Connecticut Stem Cell Institute, University of ConnecticutStorrsCTUSA
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Wentworth KL, Lalonde RL, Groppe JC, Brewer N, Moody T, Hansberry S, Taylor KE, Shore EM, Kaplan FS, Pignolo RJ, Yelick PC, Hsiao EC. Functional Testing of Bone Morphogenetic Protein (BMP) Pathway Variants Identified on Whole-Exome Sequencing in a Patient with Delayed-Onset Fibrodysplasia Ossificans Progressiva (FOP) Using ACVR1 R206H -Specific Human Cellular and Zebrafish Models. J Bone Miner Res 2022; 37:2058-2076. [PMID: 36153796 PMCID: PMC9950781 DOI: 10.1002/jbmr.4711] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 07/28/2022] [Accepted: 08/07/2022] [Indexed: 11/06/2022]
Abstract
Bone morphogenetic protein (BMP) signaling is critical in skeletal development. Overactivation can trigger heterotopic ossification (HO) as in fibrodysplasia ossificans progressiva (FOP), a rare, progressive disease of massive HO formation. A small subset of FOP patients harboring the causative ACVR1R206H mutation show strikingly mild or delayed-onset HO, suggesting that genetic variants in the BMP pathway could act as disease modifiers. Whole-exome sequencing of one such patient identified BMPR1AR443C and ACVR2AV173I as candidate modifiers. Molecular modeling predicted significant structural perturbations. Neither variant decreased BMP signaling in ACVR1R206H HEK 293T cells at baseline or after stimulation with BMP4 or activin A (AA), ligands that activate ACVR1R206H signaling. Overexpression of BMPR1AR443C in a Tg(ACVR1-R206Ha) embryonic zebrafish model, in which overactive BMP signaling yields ventralized embryos, did not alter ventralization severity, while ACVR2AV173I exacerbated ventralization. Co-expression of both variants did not affect dorsoventral patterning. In contrast, BMPR1A knockdown in ACVR1R206H HEK cells decreased ligand-stimulated BMP signaling but did not affect dorsoventral patterning in Tg(ACVR1-R206Ha) zebrafish. ACVR2A knockdown decreased only AA-stimulated signaling in ACVR1R206H HEK cells and had no effect in Tg(ACVR1-R206Ha) zebrafish. Co-knockdown in ACVR1R206H HEK cells decreased basal and ligand-stimulated signaling, and co-knockdown/knockout (bmpr1aa/ab; acvr2aa/ab) decreased Tg(ACVR1-R206Ha) zebrafish ventralization phenotypes. Our functional studies showed that knockdown of wild-type BMPR1A and ACVR2A could attenuate ACVR1R206H signaling, particularly in response to AA, and that ACVR2AV173I unexpectedly increased ACVR1R206H -mediated signaling in zebrafish. These studies describe a useful strategy and platform for functionally interrogating potential genes and genetic variants that may impact the BMP signaling pathway. © 2022 The Authors. Journal of Bone and Mineral Research published by Wiley Periodicals LLC on behalf of American Society for Bone and Mineral Research (ASBMR).
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Affiliation(s)
- Kelly L Wentworth
- Department of Medicine, Division of Endocrinology and Metabolism, Zuckerberg San Francisco General Hospital, San Francisco, CA, USA
| | - Robert L Lalonde
- Tufts University School of Dental Medicine, Division of Craniofacial and Molecular Genetics, Boston, MA, USA
| | - Jay C Groppe
- Department of Biomedical Sciences, Texas A&M University College of Dentistry, Dallas, TX, USA
| | - Niambi Brewer
- Department of Orthopedic Surgery and The Center of Research for FOP & Related Disorders, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.,Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Tania Moody
- Institute for Human Genetics, the Program in Craniofacial Biology, the UCSF Eli and Edythe Broad Institute for Regeneration Medicine, and the Department of Medicine, Division of Endocrinology and Metabolism, University of California, San Francisco, CA, USA
| | - Steven Hansberry
- San Francisco State University, California Institute of Regenerative Medicine Bridges to Stem Cell Research Program, San Francisco, CA, USA
| | - Kimberly E Taylor
- Russell/Engleman Rheumatology Research Center, University of California, San Francisco, CA, USA
| | - Eileen M Shore
- Department of Orthopedic Surgery and The Center of Research for FOP & Related Disorders, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.,Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Frederick S Kaplan
- Department of Orthopedic Surgery and The Center of Research for FOP & Related Disorders, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.,Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | | | - Pamela C Yelick
- Tufts University School of Dental Medicine, Division of Craniofacial and Molecular Genetics, Boston, MA, USA
| | - Edward C Hsiao
- Institute for Human Genetics, the Program in Craniofacial Biology, the UCSF Eli and Edythe Broad Institute for Regeneration Medicine, and the Department of Medicine, Division of Endocrinology and Metabolism, University of California, San Francisco, CA, USA
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6
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Maruyama R, Nguyen Q, Roshmi RR, Touznik A, Yokota T. Allele-Selective Locked Nucleic Acid Gapmers for the Treatment of Fibrodysplasia Ossificans Progressiva Knock Down the Pathogenic ACVR1 R206H Transcript and Inhibit Osteogenic Differentiation. Nucleic Acid Ther 2022; 32:185-193. [PMID: 35085461 DOI: 10.1089/nat.2021.0009] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Fibrodysplasia ossificans progressiva (FOP) is a rare autosomal dominant disorder characterized by episodic heterotopic ossification. The median life span of people with this disorder is ∼40 years, and currently, there is no effective treatment available. More than 95% of cases are caused by a recurrent mutation (c.617G>A; R206H) of Activin A receptor, type I (ACVR1)/Activin receptor-like kinase-2 (ALK2), a bone morphogenetic protein type I receptor. The mutation renders ACVR1 responsive to activin A, which does not activate wild-type ACVR1. Ectopic activation of ACVR1R206H by activin A induces heterotopic ossification. Since ACVR1R206H is a hyperactive receptor, a promising therapeutic strategy is to decrease the activity of mutated ACVR1. To accomplish this goal, we developed locked nucleic acid (LNA) gapmers. These are short DNA oligonucleotides with LNA modification at both ends. They induce targeted mRNA degradation and specific knockdown of gene expression. We demonstrated that some of these gapmers efficiently knocked down ACVR1R206H expression at RNA levels, while ACVR1WT was mostly unaffected in human FOP fibroblasts. Also, the gapmers suppressed osteogenic differentiation induced by ACVR1R206H and activin A. These gapmers may be promising drug candidates for FOP. This novel strategy will also pave the way for antisense-mediated therapy of other autosomal dominant disorders.
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Affiliation(s)
- Rika Maruyama
- Department of Medical Genetics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Canada
| | - Quynh Nguyen
- Department of Medical Genetics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Canada
| | - Rohini Roy Roshmi
- Department of Medical Genetics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Canada
| | - Aleksander Touznik
- Department of Medical Genetics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Canada
| | - Toshifumi Yokota
- Department of Medical Genetics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Canada.,The Friends of Garrett Cumming Research & Muscular Dystrophy Canada HM Toupin Neurological Science Research Chair, Edmonton, Canada
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Kulikauskas MR, X S, Bautch VL. The versatility and paradox of BMP signaling in endothelial cell behaviors and blood vessel function. Cell Mol Life Sci 2022; 79:77. [PMID: 35044529 PMCID: PMC8770421 DOI: 10.1007/s00018-021-04033-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 10/20/2021] [Accepted: 11/09/2021] [Indexed: 12/15/2022]
Abstract
Blood vessels expand via sprouting angiogenesis, and this process involves numerous endothelial cell behaviors, such as collective migration, proliferation, cell–cell junction rearrangements, and anastomosis and lumen formation. Subsequently, blood vessels remodel to form a hierarchical network that circulates blood and delivers oxygen and nutrients to tissue. During this time, endothelial cells become quiescent and form a barrier between blood and tissues that regulates transport of liquids and solutes. Bone morphogenetic protein (BMP) signaling regulates both proangiogenic and homeostatic endothelial cell behaviors as blood vessels form and mature. Almost 30 years ago, human pedigrees linked BMP signaling to diseases associated with blood vessel hemorrhage and shunts, and recent work greatly expanded our knowledge of the players and the effects of vascular BMP signaling. Despite these gains, there remain paradoxes and questions, especially with respect to how and where the different and opposing BMP signaling outputs are regulated. This review examines endothelial cell BMP signaling in vitro and in vivo and discusses the paradox of BMP signals that both destabilize and stabilize endothelial cell behaviors.
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Affiliation(s)
- Molly R Kulikauskas
- Curriculum in Cell Biology and Physiology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Shaka X
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Department of Biomedical Engineering, Yale University, New Haven, CT, USA
| | - Victoria L Bautch
- Curriculum in Cell Biology and Physiology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
- McAllister Heart Institute, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
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Maruyama T, Stevens R, Boka A, DiRienzo L, Chang C, Yu HMI, Nishimori K, Morrison C, Hsu W. BMPR1A maintains skeletal stem cell properties in craniofacial development and craniosynostosis. Sci Transl Med 2021; 13:13/583/eabb4416. [PMID: 33658353 DOI: 10.1126/scitranslmed.abb4416] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 10/19/2020] [Accepted: 02/12/2021] [Indexed: 12/20/2022]
Abstract
Skeletal stem cells from the suture mesenchyme, which are referred to as suture stem cells (SuSCs), exhibit long-term self-renewal, clonal expansion, and multipotency. These SuSCs reside in the suture midline and serve as the skeletal stem cell population responsible for calvarial development, homeostasis, injury repair, and regeneration. The ability of SuSCs to engraft in injury site to replace the damaged skeleton supports their potential use for stem cell-based therapy. Here, we identified BMPR1A as essential for SuSC self-renewal and SuSC-mediated bone formation. SuSC-specific disruption of Bmpr1a in mice caused precocious differentiation, leading to craniosynostosis initiated at the suture midline, which is the stem cell niche. We found that BMPR1A is a cell surface marker of human SuSCs. Using an ex vivo system, we showed that SuSCs maintained stemness properties for an extended period without losing the osteogenic ability. This study advances our knowledge base of congenital deformity and regenerative medicine mediated by skeletal stem cells.
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Affiliation(s)
- Takamitsu Maruyama
- Center for Oral Biology, University of Rochester Medical Center, Rochester, NY 14642, USA.,Department of Dentistry, University of Rochester Medical Center, Rochester, NY 14642, USA
| | - Ronay Stevens
- Center for Oral Biology, University of Rochester Medical Center, Rochester, NY 14642, USA
| | - Alan Boka
- Center for Oral Biology, University of Rochester Medical Center, Rochester, NY 14642, USA
| | - Laura DiRienzo
- Center for Oral Biology, University of Rochester Medical Center, Rochester, NY 14642, USA
| | - Connie Chang
- Center for Oral Biology, University of Rochester Medical Center, Rochester, NY 14642, USA
| | - Hsiao-Man Ivy Yu
- Center for Oral Biology, University of Rochester Medical Center, Rochester, NY 14642, USA
| | - Katsuhiko Nishimori
- Department of Bioregulation and Pharmacological Medicine and Department of Obesity and Internal Inflammation, Fukushima Medical University, Fukushima City 960-1295, Japan
| | - Clinton Morrison
- Department of Surgery, University of Rochester Medical Center, Rochester, NY 14642, USA
| | - Wei Hsu
- Center for Oral Biology, University of Rochester Medical Center, Rochester, NY 14642, USA. .,Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, NY 14642, USA.,Stem Cell and Regenerative Medicine Institute, University of Rochester Medical Center, Rochester, NY 14642, USA
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9
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Accumulated Knowledge of Activin Receptor-Like Kinase 2 (ALK2)/Activin A Receptor, Type 1 (ACVR1) as a Target for Human Disorders. Biomedicines 2021; 9:biomedicines9070736. [PMID: 34206903 PMCID: PMC8301367 DOI: 10.3390/biomedicines9070736] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 06/08/2021] [Accepted: 06/23/2021] [Indexed: 12/17/2022] Open
Abstract
Activin receptor-like kinase 2 (ALK2), also known as Activin A receptor type 1 (ACVR1), is a transmembrane kinase receptor for members of the transforming growth factor-β family. Wild-type ALK2/ACVR1 transduces osteogenic signaling in response to ligand binding. Fifteen years ago, a gain-of-function mutation in the ALK2/ACVR1 gene was detected in patients with the genetic disorder fibro-dysplasia ossificans progressiva, which is characterized by heterotopic ossification in soft tissues. Additional disorders, such as diffuse intrinsic pontin glioma, diffuse idiopathic skeletal hyperostosis, primary focal hyperhidrosis, and congenital heart defects, have also been found to be associated with ALK2/ACVR1. These findings further expand in vitro and in vivo model system research and promote our understanding of the molecular mechanisms of the pathogenesis and development of novel therapeutics and diagnosis for disorders associated with ALK2/ACVR1. Through aggressive efforts, some of the disorders associated with ALK2/ACVR1 will be overcome in the near future.
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Hu Y, Hao X, Liu C, Ren C, Wang S, Yan G, Meng Y, Mishina Y, Shi C, Sun H. Acvr1 deletion in osteoblasts impaired mandibular bone mass through compromised osteoblast differentiation and enhanced sRANKL-induced osteoclastogenesis. J Cell Physiol 2021; 236:4580-4591. [PMID: 33251612 PMCID: PMC8048423 DOI: 10.1002/jcp.30183] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2020] [Revised: 11/04/2020] [Accepted: 11/16/2020] [Indexed: 12/30/2022]
Abstract
Bone morphogenetic protein (BMP) signaling is well known in bone homeostasis. However, the physiological effects of BMP signaling on mandibles are largely unknown, as the mandible has distinct functions and characteristics from other bones. In this study, we investigated the roles of BMP signaling in bone homeostasis of the mandibles by deleting BMP type I receptor Acvr1 in osteoblast lineage cells with Osterix-Cre. We found mandibular bone loss in conditional knockout mice at the ages of postnatal day 21 and 42 in an age-dependent manner. The decreased bone mass was related to compromised osteoblast differentiation together with enhanced osteoclastogenesis, which was secondary to the changes in osteoblasts in vivo. In vitro study revealed that deletion of Acvr1 in the mandibular bone marrow stromal cells (BMSCs) significantly compromised osteoblast differentiation. When wild type bone marrow macrophages were cocultured with BMSCs lacking Acvr1 both directly and indirectly, both proliferation and differentiation of osteoclasts were induced as evidenced by an increase of multinucleated cells, compared with cocultured with control BMSCs. Furthermore, we demonstrated that the increased osteoclastogenesis in vitro was at least partially due to the secretion of soluble receptor activator of nuclear factor-κB ligand (sRANKL), which is probably the reason for the mandibular bone loss in vivo. Overall, our results proposed that ACVR1 played essential roles in maintaining mandibular bone homeostasis through osteoblast differentiation and osteoblast-osteoclast communication via sRANKL.
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Affiliation(s)
- Yue Hu
- Department of Oral Pathology, Hospital of StomatologyJilin UniversityChangchunChina
- Key Laboratory of Tooth Development and Bone Remodeling of Jilin ProvinceChangchunChina
| | - Xinqing Hao
- Department of Oral Pathology, Hospital of StomatologyJilin UniversityChangchunChina
- Key Laboratory of Tooth Development and Bone Remodeling of Jilin ProvinceChangchunChina
| | - Cangwei Liu
- Department of Oral Pathology, School and Hospital of StomatologyChina Medical UniversityShenyangChina
| | - Chunxia Ren
- Department of Oral Pathology, Hospital of StomatologyJilin UniversityChangchunChina
- Key Laboratory of Tooth Development and Bone Remodeling of Jilin ProvinceChangchunChina
| | - Shuangshuang Wang
- Department of Oral Pathology, School and Hospital of StomatologyChina Medical UniversityShenyangChina
| | - Guangxing Yan
- Department of Oral Pathology, Hospital of StomatologyJilin UniversityChangchunChina
- Key Laboratory of Tooth Development and Bone Remodeling of Jilin ProvinceChangchunChina
| | - Yuan Meng
- Department of Oral Pathology, School and Hospital of StomatologyChina Medical UniversityShenyangChina
| | - Yuji Mishina
- Department of Biologic and Materials Sciences, School of DentistryUniversity of MichiganAnn ArborMichiganUSA
| | - Ce Shi
- Department of Oral Pathology, Hospital of StomatologyJilin UniversityChangchunChina
- Key Laboratory of Tooth Development and Bone Remodeling of Jilin ProvinceChangchunChina
| | - Hongchen Sun
- Department of Oral Pathology, Hospital of StomatologyJilin UniversityChangchunChina
- Key Laboratory of Tooth Development and Bone Remodeling of Jilin ProvinceChangchunChina
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11
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Yang J, Toda Nakamura M, Hallett SA, Ueharu H, Zhang H, Kelley K, Fukuda T, Komatsu Y, Mishina Y. Generation of a new mouse line with conditionally activated signaling through the BMP receptor, ACVR1: A tool to characterize pleiotropic roles of BMP functions. Genesis 2021; 59:e23419. [PMID: 33851764 DOI: 10.1002/dvg.23419] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 04/01/2021] [Accepted: 04/02/2021] [Indexed: 12/24/2022]
Abstract
BMP signaling plays pleiotropic roles in various tissues during embryogenesis and after birth. We have previously generated a constitutively activated Acvr1(ca-Acvr1) transgenic mouse line (line L35) through pronuclei injection to investigate impacts of enhanced BMP signaling in a tissue specific manner. However, line L35 shows a restricted expression pattern of the transgene. Here, we generated another ca-Acvr1 transgenic line, line A11, using embryonic stem (ES) transgenesis. The generated line A11 shows distinctive phenotypes from line L35, along with very limited expression levels of the transgene. When the transgene is activated in the neural crest cells in a Cre-dependent manner, line A11 exhibits cleft palate and shorter jaws, while line L35 develops ectopic cartilages and highly hypomorphic facial structures. When activated in limb buds, line A11 develops organized but smaller limb skeletal structures, while line L35 forms disorganized limbs with little mineralization. Additionally, no heterotopic ossification (HO) is identified in line A11 when bred with NFATc1-Cre mice even after induction of tissue injury, which is an established protocol for HO for line L35. Therefore, the newly generated conditional ca-Acvr1 mouse line A11 provides an additional resource to dissect highly context dependent functions of BMP signaling in development and disease.
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Affiliation(s)
- Jingwen Yang
- The State Key Laboratory Breeding Base of Basic Science of Stomatology & Key Laboratory for Oral Biomedicine of Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, Hubei, 430079, China.,Department of Biologic and Materials Sciences & Prosthodontics, School of Dentistry, University of Michigan, MI, USA
| | - Masako Toda Nakamura
- Department of Biologic and Materials Sciences & Prosthodontics, School of Dentistry, University of Michigan, MI, USA.,Department of Oral Growth and Development, Fukuoka Dental College, Hakata, Fukuoka, Japan
| | - Shawn A Hallett
- Department of Biologic and Materials Sciences & Prosthodontics, School of Dentistry, University of Michigan, MI, USA.,Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, MI, USA
| | - Hiroki Ueharu
- Department of Biologic and Materials Sciences & Prosthodontics, School of Dentistry, University of Michigan, MI, USA
| | - Honghao Zhang
- Department of Biologic and Materials Sciences & Prosthodontics, School of Dentistry, University of Michigan, MI, USA
| | - Kristen Kelley
- Department of Biologic and Materials Sciences & Prosthodontics, School of Dentistry, University of Michigan, MI, USA
| | - Tomokazu Fukuda
- Department of Biological Sciences, Faculty of Science and Engineering, Iwate University, Morioka, Iwate, Japan
| | - Yoshihiro Komatsu
- Department of Pediatrics, University of Texas Health Science Center at Houston, John P and Katherine G McGovern Medical School Huston, TX, USA
| | - Yuji Mishina
- Department of Biologic and Materials Sciences & Prosthodontics, School of Dentistry, University of Michigan, MI, USA
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12
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Abstract
TGF-β family heterodimeric ligands show increased or exclusive signaling compared to homodimeric ligands in both vertebrate and insect development as well as in therapeutically relevant processes, like osteogenesis. However, the mechanisms that differentiate heterodimer and homodimer signaling remain uncharacterized. We show that BMP antagonists do not account for the exclusive signaling of Bmp2/7 heterodimers in zebrafish development. We found that overexpressed homodimers can signal but surprisingly require two distinct type I receptors, like heterodimers, indicating a required activity of the heteromeric type I receptor complex. We further demonstrate that a canonical type I receptor function has been delegated to only one of these receptors, Acvr1. Our findings should inform both basic and translational research in multiple TGF-β family signaling contexts. Heterodimeric TGF-β ligands outperform homodimers in a variety of developmental, cell culture, and therapeutic contexts; however, the mechanisms underlying this increased potency remain uncharacterized. Here, we use dorsal–ventral axial patterning of the zebrafish embryo to interrogate the BMP2/7 heterodimer signaling mechanism. We demonstrate that differential interactions with BMP antagonists do not account for the reduced signaling ability of homodimers. Instead, we find that while overexpressed BMP2 homodimers can signal, they require two nonredundant type I receptors, one from the Acvr1 subfamily and one from the Bmpr1 subfamily. This implies that all BMP signaling within the zebrafish gastrula, even BMP2 homodimer signaling, requires Acvr1. This is particularly surprising as BMP2 homodimers do not bind Acvr1 in vitro. Furthermore, we find that the roles of the two type I receptors are subfunctionalized within the heterodimer signaling complex, with the kinase activity of Acvr1 being essential, while that of Bmpr1 is not. These results suggest that the potency of the Bmp2/7 heterodimer arises from the ability to recruit both Acvr1 and Bmpr1 into the same signaling complex.
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13
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Cardiopulmonary and Neurologic Dysfunctions in Fibrodysplasia Ossificans Progressiva. Biomedicines 2021; 9:biomedicines9020155. [PMID: 33562570 PMCID: PMC7915901 DOI: 10.3390/biomedicines9020155] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 01/20/2021] [Accepted: 01/28/2021] [Indexed: 12/28/2022] Open
Abstract
Fibrodysplasia Ossificans Progressiva (FOP) is an ultra-rare but debilitating disorder characterized by spontaneous, progressive, and irreversible heterotopic ossifications (HO) at extraskeletal sites. FOP is caused by gain-of-function mutations in the Activin receptor Ia/Activin-like kinase 2 gene (Acvr1/Alk2), with increased receptor sensitivity to bone morphogenetic proteins (BMPs) and a neoceptor response to Activin A. There is extensive literature on the skeletal phenotypes in FOP, but a much more limited understanding of non-skeletal manifestations of this disease. Emerging evidence reveals important cardiopulmonary and neurologic dysfunctions in FOP including thoracic insufficiency syndrome, pulmonary hypertension, conduction abnormalities, neuropathic pain, and demyelination of the central nervous system (CNS). Here, we review the recent research and discuss unanswered questions regarding the cardiopulmonary and neurologic phenotypes in FOP.
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14
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Bardot ES, Hadjantonakis AK. Mouse gastrulation: Coordination of tissue patterning, specification and diversification of cell fate. Mech Dev 2020; 163:103617. [PMID: 32473204 PMCID: PMC7534585 DOI: 10.1016/j.mod.2020.103617] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 05/18/2020] [Accepted: 05/22/2020] [Indexed: 12/22/2022]
Abstract
During mouse embryonic development a mass of pluripotent epiblast tissue is transformed during gastrulation to generate the three definitive germ layers: endoderm, mesoderm, and ectoderm. During gastrulation, a spatiotemporally controlled sequence of events results in the generation of organ progenitors and positions them in a stereotypical fashion throughout the embryo. Key to the correct specification and differentiation of these cell fates is the establishment of an axial coordinate system along with the integration of multiple signals by individual epiblast cells to produce distinct outcomes. These signaling domains evolve as the anterior-posterior axis is established and the embryo grows in size. Gastrulation is initiated at the posteriorly positioned primitive streak, from which nascent mesoderm and endoderm progenitors ingress and begin to diversify. Advances in technology have facilitated the elaboration of landmark findings that originally described the epiblast fate map and signaling pathways required to execute those fates. Here we will discuss the current state of the field and reflect on how our understanding has shifted in recent years.
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Affiliation(s)
- Evan S Bardot
- Developmental Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, NY 10065, USA.
| | - Anna-Katerina Hadjantonakis
- Developmental Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, NY 10065, USA.
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15
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Omi M, Kaartinen V, Mishina Y. Activin A receptor type 1-mediated BMP signaling regulates RANKL-induced osteoclastogenesis via canonical SMAD-signaling pathway. J Biol Chem 2019; 294:17818-17836. [PMID: 31619522 DOI: 10.1074/jbc.ra119.009521] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 10/10/2019] [Indexed: 12/12/2022] Open
Abstract
Bone morphogenetic proteins (BMPs) are important mediators of osteoclast differentiation. Although accumulating evidence has implicated BMPs in osteoblastogenesis, the mechanisms by which BMPs regulate osteoclastogenesis remain unclear. Activin A receptor type 1 (ACVR1) is a BMP type 1 receptor essential for skeletal development. Here, we observed that BMP-7, which preferentially binds to ACVR1, promotes osteoclast differentiation, suggesting ACVR1 is involved in osteoclastogenesis. To investigate this further, we isolated osteoclasts from either Acvr1-floxed mice or mice with constitutively-activated Acvr1 (caAcvr1) carrying tamoxifen-inducible Cre driven by a ubiquitin promotor and induced Cre activity in culture. Osteoclasts from the Acvr1-floxed mice had reduced osteoclast numbers and demineralization activity, whereas those from the caAcvr1-mutant mice formed large osteoclasts and demineralized pits, suggesting that BMP signaling through ACVR1 regulates osteoclast fusion and activity. It is reported that BMP-2 binds to BMPR1A, another BMP type 1 receptor, whereas BMP-7 binds to ACVR1 to activate SMAD1/5/9 signaling. Here, Bmpr1a-disrupted osteoclasts displayed reduced phospho-SMAD1/5/9 (pSMAD1/5/9) levels when induced by BMP-2, whereas no impacts on pSMAD1/5/9 were observed when induced by BMP-7. In contract, Acvr1-disrupted osteoclasts displayed reduced pSMAD1/5/9 levels when induced either by BMP-2 or BMP-7, suggesting that ACVR1 is the major receptor for transducing BMP-7 signals in osteoclasts. Indeed, LDN-193189 and LDN-212854, which specifically block SMAD1/5/9 phosphorylation, inhibited osteoclastogenesis of caAcvr1-mutant cells. Moreover, increased BMP signaling promoted nuclear translocation of nuclear factor-activated T-cells 1 (NFATc1), which was inhibited by LDN treatments. Taken together, ACVR1-mediated BMP-SMAD signaling activates NFATc1, a regulatory protein crucial for receptor activator of NF-κB ligand (RANKL)-induced osteoclastogenesis.
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Affiliation(s)
- Maiko Omi
- Department of Biologic and Materials Sciences and Prosthodontics, School of Dentistry, University of Michigan, Ann Arbor, Michigan 48109
| | - Vesa Kaartinen
- Department of Biologic and Materials Sciences and Prosthodontics, School of Dentistry, University of Michigan, Ann Arbor, Michigan 48109
| | - Yuji Mishina
- Department of Biologic and Materials Sciences and Prosthodontics, School of Dentistry, University of Michigan, Ann Arbor, Michigan 48109
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16
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Moses MM, Behringer RR. A gene regulatory network for Müllerian duct regression. ENVIRONMENTAL EPIGENETICS 2019; 5:dvz017. [PMID: 31579527 PMCID: PMC6760261 DOI: 10.1093/eep/dvz017] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 08/12/2019] [Accepted: 08/13/2019] [Indexed: 05/03/2023]
Abstract
Mammalian embryos initially develop progenitor tissues for both male and female reproductive tract organs, known as the Wolffian ducts and the Müllerian ducts, respectively. Ultimately, each individual develops a single set of male or female reproductive tract organs. Therefore, an essential step for sex differentiation is the regression of one duct and growth and differentiation of the other duct. In males, this requires Müllerian duct regression and Wolffian duct growth and differentiation. Müllerian duct regression is induced by the expression of Amh, encoding anti-Müllerian hormone, from the fetal testes. Subsequently, receptor-mediated signal transduction in mesenchymal cells surrounding the Müllerian duct epithelium leads to duct elimination. The genes that induce Amh transcription and the downstream signaling that results from Amh activity form a pathway. However, the molecular details of this pathway are currently unknown. A set of essential genes for AMH pathway function has been identified. More recently, transcriptome analysis of male and female Müllerian duct mesenchyme at an initial stage of regression has identified new genes that may mediate elimination of the Müllerian system. The evidence taken together can be used to generate an initial gene regulatory network describing the Amh pathway for Müllerian duct regression. An Amh gene regulatory network will be a useful tool to study Müllerian duct regression, sex differentiation, and its relationship to environmental influences.
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Affiliation(s)
- Malcolm M Moses
- Department of Genetics, University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030, USA
| | - Richard R Behringer
- Department of Genetics, University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030, USA
- Correspondence address. Department of Genetics, University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030, USA. Tel: +713-834-6327; Fax: +713-834-6339; E-mail:
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17
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Hildebrand L, Schmidt-von Kegler M, Walther M, Seemann P, Stange K. Limb specific Acvr1-knockout during embryogenesis in mice exhibits great toe malformation as seen in Fibrodysplasia Ossificans Progressiva (FOP). Dev Dyn 2019; 248:396-403. [PMID: 30854720 PMCID: PMC6593811 DOI: 10.1002/dvdy.24] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 02/25/2019] [Accepted: 03/04/2019] [Indexed: 12/28/2022] Open
Abstract
Purpose This study analyzes Prx1‐specific conditional knockout of Acvr1 aiming to elucidate the endogenous role of Acvr1 during limb formation in early embryonic development. ACVR1 can exhibit activating and inhibiting function in BMP signaling. ACVR1 gain‐of‐function mutations can cause the rare disease fibrodysplasia ossificans progressiva (FOP), where patients develop ectopic bone replacing soft tissue, tendons and ligaments. Methods Whole‐mount in situ hybridization and skeletal preparations revealed that following limb‐specific conditional knockout of Acvr1, metacarpals and proximal phalanges were shortened and additional cartilage and bone elements were formed. Results The analysis of a set of marker genes including ligands and receptors of BMP signaling as well as genes involved in patterning and tendon and cartilage formation, revealed temporal disturbances with distinct spatial patterns. The most striking result was that in the absence of Acvr1 in mesoderm precursor cells, first digits were drastically malformed. Conclusion In FOP, malformation of big toes can serve as a first soft marker in diagnostics. The surprising similarities in phenotype between the described conditional knockout of Acvr1 and the FOP mouse model, indicates a natural inhibitory function of ACVR1. This represents a further step towards better understanding the role of Acvr1 and developing treatment options for FOP. Limb specific conditional KO of Acvr1 leads to shortened extremities and to heterotopic cartilage and bone formation. Acvr1 is particularly involved in the development of the first digit. Phenotypic similarities between the limb specific cKO of Acvr1 and the FOP mouse model, carrying the gain of function mutation p.R206H in Acvr1, indicates a natural inhibitory function of Acvr1.
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Affiliation(s)
- Laura Hildebrand
- Berlin-Brandenburg Center for Regenerative Therapies (BCRT) / Charité Virchow Campus, Berlin, Germany.,Charité- Universitätsmedizin Berlin, Berlin, Germany.,Berlin Brandenburg School for Regenerative Therapies (BSRT), Berlin, Germany
| | - Mareen Schmidt-von Kegler
- Berlin-Brandenburg Center for Regenerative Therapies (BCRT) / Charité Virchow Campus, Berlin, Germany.,Charité- Universitätsmedizin Berlin, Berlin, Germany
| | - Maria Walther
- Berlin-Brandenburg Center for Regenerative Therapies (BCRT) / Charité Virchow Campus, Berlin, Germany.,Charité- Universitätsmedizin Berlin, Berlin, Germany
| | - Petra Seemann
- Berlin-Brandenburg Center for Regenerative Therapies (BCRT) / Charité Virchow Campus, Berlin, Germany.,Charité- Universitätsmedizin Berlin, Berlin, Germany.,Berlin Brandenburg School for Regenerative Therapies (BSRT), Berlin, Germany
| | - Katja Stange
- Berlin-Brandenburg Center for Regenerative Therapies (BCRT) / Charité Virchow Campus, Berlin, Germany.,Charité- Universitätsmedizin Berlin, Berlin, Germany.,Berlin Brandenburg School for Regenerative Therapies (BSRT), Berlin, Germany
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18
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Yang J, Mishina Y. Generation and Identification of Genetically Modified Mice for BMP Receptors. Methods Mol Biol 2019; 1891:165-177. [PMID: 30414132 DOI: 10.1007/978-1-4939-8904-1_12] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BMP signaling is critical in embryogenesis and in the development of numerous tissues. Many genetically modified (knockout and transgenic) mice have been established to study BMP function in development and disease. Mice with altered BMP receptor genes (including global knockout, conditional knockout, and conditional constitutively active transgenic mouse lines) have been particularly informative. In this chapter, we describe how the genetically modified mice were generated and introduce genotyping methods. These methods include regular PCR and genomic real-time PCR using specific primers based on different constructs in different mice strains.
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Affiliation(s)
- Jingwen Yang
- Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor, MI, USA.,State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM), School and Hospital of Stomatology, Wuhan University, Wuhan, Hubei, China
| | - Yuji Mishina
- Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor, MI, USA.
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19
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Abstract
BMPs play important roles in the development, disease, and regeneration of many tissues. Genetically modified mice with altered BMP receptor genes are particularly informative for clarifying the role of BMP signaling. In this chapter, we introduce several selected protocols for in vivo functional characterization of BMP receptors in genetically modified mice, including immunohistochemistry of BMP downstream signaling (P-Smad1/5/9 or others), histological analysis, whole-mount skeletal staining for cartilage and bone tissues, and whole-mount cartilage staining.
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20
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Zhang X, Shi C, Zhao H, Zhou Y, Hu Y, Yan G, Liu C, Li D, Hao X, Mishina Y, Liu Q, Sun H. Distinctive role of ACVR1 in dentin formation: requirement for dentin thickness in molars and prevention of osteodentin formation in incisors of mice. J Mol Histol 2018; 50:43-61. [PMID: 30519900 DOI: 10.1007/s10735-018-9806-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2018] [Accepted: 11/29/2018] [Indexed: 11/24/2022]
Abstract
Dentin is a major component of teeth that protects dental pulp and maintains tooth health. Bone morphogenetic protein (BMP) signaling is required for the formation of dentin. Mice lacking a BMP type I receptor, activin A receptor type 1 (ACVR1), in the neural crest display a deformed mandible. Acvr1 is known to be expressed in the dental mesenchyme. However, little is known about how BMP signaling mediated by ACVR1 regulates dentinogenesis. To explore the role of ACVR1 in dentin formation in molars and incisors in mice, Acvr1 was conditionally disrupted in Osterix-expressing cells (designated as cKO). We found that loss of Acvr1 in the dental mesenchyme led to dentin dysplasia in molars and osteodentin formation in incisors. Specifically, the cKO mice exhibited remarkable tooth phenotypes characterized by thinner dentin and thicker predentin, as well as compromised differentiation of odontoblasts in molars. We also found osteodentin formation in the coronal part of the cKO mandibular incisors, which was associated with a reduction in the expression of odontogenic gene Dsp and an increase in the expression of osteogenic gene Bsp, leading to an alteration of cell fate from odontoblasts to osteoblasts. In addition, the expressions of WNT antagonists, Dkk1 and Sost, were downregulated and B-catenin was up-regulated in the cKO incisors, while the expression levels were not changed in the cKO molars, compared with the corresponding controls. Our results indicate the distinct and critical roles of ACVR1 between incisors and molars, which is associated with alterations in the WNT signaling related molecules. This study demonstrates for the first time the physiological roles of ACVR1 during dentinogenesis.
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Affiliation(s)
- Xue Zhang
- Department of Oral Pathology, School and Hospital of Stomatology, Jilin University, Changchun, 130021, China.,Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Changchun, 130021, China
| | - Ce Shi
- Department of Oral Pathology, School and Hospital of Stomatology, Jilin University, Changchun, 130021, China.,Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Changchun, 130021, China
| | - Huan Zhao
- Department of Oral Pathology, School and Hospital of Stomatology, Jilin University, Changchun, 130021, China.,Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Changchun, 130021, China
| | - Yijun Zhou
- Department of Oral Pathology, School and Hospital of Stomatology, Jilin University, Changchun, 130021, China.,Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Changchun, 130021, China
| | - Yue Hu
- Department of Oral Pathology, School and Hospital of Stomatology, Jilin University, Changchun, 130021, China.,Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Changchun, 130021, China
| | - Guangxing Yan
- Department of Oral Pathology, School and Hospital of Stomatology, Jilin University, Changchun, 130021, China.,Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Changchun, 130021, China
| | - Cangwei Liu
- Department of Oral Pathology, School and Hospital of Stomatology, Jilin University, Changchun, 130021, China.,Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Changchun, 130021, China
| | - Daowei Li
- Department of Oral Pathology, School and Hospital of Stomatology, Jilin University, Changchun, 130021, China.,Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Changchun, 130021, China
| | - Xinqing Hao
- Department of Oral Pathology, School and Hospital of Stomatology, Jilin University, Changchun, 130021, China.,Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Changchun, 130021, China
| | - Yuji Mishina
- Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor, MI, 48109-1078, USA
| | - Qilin Liu
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Changchun, 130021, China. .,Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology, Jilin University, Changchun, 130021, China.
| | - Hongchen Sun
- Department of Oral Pathology, School and Hospital of Stomatology, Jilin University, Changchun, 130021, China. .,Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Changchun, 130021, China.
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21
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An mTOR Signaling Modulator Suppressed Heterotopic Ossification of Fibrodysplasia Ossificans Progressiva. Stem Cell Reports 2018; 11:1106-1119. [PMID: 30392977 PMCID: PMC6235670 DOI: 10.1016/j.stemcr.2018.10.007] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 10/05/2018] [Accepted: 10/05/2018] [Indexed: 12/11/2022] Open
Abstract
Fibrodysplasia ossificans progressiva (FOP) is a rare and intractable disorder characterized by extraskeletal bone formation through endochondral ossification. FOP patients harbor gain-of-function mutations in ACVR1 (FOP-ACVR1), a type I receptor for bone morphogenetic proteins. Despite numerous studies, no drugs have been approved for FOP. Here, we developed a high-throughput screening (HTS) system focused on the constitutive activation of FOP-ACVR1 by utilizing a chondrogenic ATDC5 cell line that stably expresses FOP-ACVR1. After HTS of 5,000 small-molecule compounds, we identified two hit compounds that are effective at suppressing the enhanced chondrogenesis of FOP patient-derived induced pluripotent stem cells (FOP-iPSCs) and suppressed the heterotopic ossification (HO) of multiple model mice, including FOP-ACVR1 transgenic mice and HO model mice utilizing FOP-iPSCs. Furthermore, we revealed that one of the hit compounds is an mTOR signaling modulator that indirectly inhibits mTOR signaling. Our results demonstrate that these hit compounds could contribute to future drug repositioning and the mechanistic analysis of mTOR signaling. Established a screening system for fibrodysplasia ossificans progressiva (FOP) Identified two hit compounds that are effective in multiple FOP model mice An mTOR signaling modulator opens the door to a therapeutic strategy
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22
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Abstract
TGF-β family ligands function in inducing and patterning many tissues of the early vertebrate embryonic body plan. Nodal signaling is essential for the specification of mesendodermal tissues and the concurrent cellular movements of gastrulation. Bone morphogenetic protein (BMP) signaling patterns tissues along the dorsal-ventral axis and simultaneously directs the cell movements of convergence and extension. After gastrulation, a second wave of Nodal signaling breaks the symmetry between the left and right sides of the embryo. During these processes, elaborate regulatory feedback between TGF-β ligands and their antagonists direct the proper specification and patterning of embryonic tissues. In this review, we summarize the current knowledge of the function and regulation of TGF-β family signaling in these processes. Although we cover principles that are involved in the development of all vertebrate embryos, we focus specifically on three popular model organisms: the mouse Mus musculus, the African clawed frog of the genus Xenopus, and the zebrafish Danio rerio, highlighting the similarities and differences between these species.
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Affiliation(s)
- Joseph Zinski
- University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania 19104-6058
| | - Benjamin Tajer
- University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania 19104-6058
| | - Mary C Mullins
- University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania 19104-6058
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23
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Cohen KJ, Jabado N, Grill J. Diffuse intrinsic pontine gliomas-current management and new biologic insights. Is there a glimmer of hope? Neuro Oncol 2018; 19:1025-1034. [PMID: 28371920 DOI: 10.1093/neuonc/nox021] [Citation(s) in RCA: 79] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Diffuse intrinsic pontine glioma (DIPG) has proven to be one of the most challenging of all pediatric cancers. Owing to a historical reticence to obtain tumor tissue for study, and based on an erroneous assumption that the biology of DIPG would mirror that of supratentorial high-grade astrocytomas, innumerable studies have been undertaken-all of which have had a negligible impact on the natural history of this disease. More recently, improvements in neurosurgical techniques have allowed for the safe upfront biopsy of DIPG, which, together with a wider use of autopsy tissue, has led to an evolving understanding of the biology of this tumor. The discovery of a recurrent somatic gain-of-function mutation leading to lysine 27 to methionine (p.Lys27Met, K27M) substitution in histone 3 variants characterizes more than 85% of DIPG, suggesting for the first time the role of the epigenome and histones in the pathogenesis of this disease, and more unified diagnostic criteria. Along with further molecular insights into the pathogenesis of DIPG, rational targets are being identified and studied in the hopes of improving the otherwise dismal outcome for children with DIPG.
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Affiliation(s)
- Kenneth J Cohen
- Pediatric Oncology, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, Maryland; Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Université Paris-Saclay & Gustave Roussy Unité Mixte de Recherche 8203 du Centre National de la Recherche Scientifique & Departement de Cancerologie de l'Enfant et de l'Adolescent, Villejuif, France
| | - Nada Jabado
- Pediatric Oncology, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, Maryland; Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Université Paris-Saclay & Gustave Roussy Unité Mixte de Recherche 8203 du Centre National de la Recherche Scientifique & Departement de Cancerologie de l'Enfant et de l'Adolescent, Villejuif, France
| | - Jacques Grill
- Pediatric Oncology, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, Maryland; Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Université Paris-Saclay & Gustave Roussy Unité Mixte de Recherche 8203 du Centre National de la Recherche Scientifique & Departement de Cancerologie de l'Enfant et de l'Adolescent, Villejuif, France
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Morgani SM, Metzger JJ, Nichols J, Siggia ED, Hadjantonakis AK. Micropattern differentiation of mouse pluripotent stem cells recapitulates embryo regionalized cell fate patterning. eLife 2018; 7:e32839. [PMID: 29412136 PMCID: PMC5807051 DOI: 10.7554/elife.32839] [Citation(s) in RCA: 117] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Accepted: 02/02/2018] [Indexed: 12/29/2022] Open
Abstract
During gastrulation epiblast cells exit pluripotency as they specify and spatially arrange the three germ layers of the embryo. Similarly, human pluripotent stem cells (PSCs) undergo spatially organized fate specification on micropatterned surfaces. Since in vivo validation is not possible for the human, we developed a mouse PSC micropattern system and, with direct comparisons to mouse embryos, reveal the robust specification of distinct regional identities. BMP, WNT, ACTIVIN and FGF directed mouse epiblast-like cells to undergo an epithelial-to-mesenchymal transition and radially pattern posterior mesoderm fates. Conversely, WNT, ACTIVIN and FGF patterned anterior identities, including definitive endoderm. By contrast, epiblast stem cells, a developmentally advanced state, only specified anterior identities, but without patterning. The mouse micropattern system offers a robust scalable method to generate regionalized cell types present in vivo, resolve how signals promote distinct identities and generate patterns, and compare mechanisms operating in vivo and in vitro and across species.
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Affiliation(s)
- Sophie M Morgani
- Developmental Biology ProgramSloan Kettering Institute, Memorial Sloan Kettering Cancer CenterNew YorkUnited States
- Wellcome Trust-Medical Research Council Centre for Stem Cell ResearchUniversity of CambridgeCambridgeUnited Kingdom
| | - Jakob J Metzger
- Center for Studies in Physics and BiologyThe Rockefeller UniversityNew YorkUnited States
| | - Jennifer Nichols
- Wellcome Trust-Medical Research Council Centre for Stem Cell ResearchUniversity of CambridgeCambridgeUnited Kingdom
| | - Eric D Siggia
- Center for Studies in Physics and BiologyThe Rockefeller UniversityNew YorkUnited States
| | - Anna-Katerina Hadjantonakis
- Developmental Biology ProgramSloan Kettering Institute, Memorial Sloan Kettering Cancer CenterNew YorkUnited States
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25
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Monsivais D, Matzuk MM, Pangas SA. The TGF-β Family in the Reproductive Tract. Cold Spring Harb Perspect Biol 2017; 9:cshperspect.a022251. [PMID: 28193725 DOI: 10.1101/cshperspect.a022251] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The transforming growth factor β (TGF-β) family has a profound impact on the reproductive function of various organisms. In this review, we discuss how highly conserved members of the TGF-β family influence the reproductive function across several species. We briefly discuss how TGF-β-related proteins balance germ-cell proliferation and differentiation as well as dauer entry and exit in Caenorhabditis elegans. In Drosophila melanogaster, TGF-β-related proteins maintain germ stem-cell identity and eggshell patterning. We then provide an in-depth analysis of landmark studies performed using transgenic mouse models and discuss how these data have uncovered basic developmental aspects of male and female reproductive development. In particular, we discuss the roles of the various TGF-β family ligands and receptors in primordial germ-cell development, sexual differentiation, and gonadal cell development. We also discuss how mutant mouse studies showed the contribution of TGF-β family signaling to embryonic and postnatal testis and ovarian development. We conclude the review by describing data obtained from human studies, which highlight the importance of the TGF-β family in normal female reproductive function during pregnancy and in various gynecologic pathologies.
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Affiliation(s)
- Diana Monsivais
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, Texas 77030.,Center for Drug Discovery, Baylor College of Medicine, Houston, Texas 77030
| | - Martin M Matzuk
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, Texas 77030.,Center for Drug Discovery, Baylor College of Medicine, Houston, Texas 77030.,Department of Molecular and Cellular Biology, Baylor College of Medicine Houston, Texas 77030.,Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 77030.,Department of Pharmacology, Baylor College of Medicine, Houston, Texas 77030
| | - Stephanie A Pangas
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, Texas 77030.,Center for Drug Discovery, Baylor College of Medicine, Houston, Texas 77030.,Department of Molecular and Cellular Biology, Baylor College of Medicine Houston, Texas 77030
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26
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Hino K, Horigome K, Nishio M, Komura S, Nagata S, Zhao C, Jin Y, Kawakami K, Yamada Y, Ohta A, Toguchida J, Ikeya M. Activin-A enhances mTOR signaling to promote aberrant chondrogenesis in fibrodysplasia ossificans progressiva. J Clin Invest 2017; 127:3339-3352. [PMID: 28758906 DOI: 10.1172/jci93521] [Citation(s) in RCA: 110] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Accepted: 06/13/2017] [Indexed: 12/27/2022] Open
Abstract
Fibrodysplasia ossificans progressiva (FOP) is a rare and intractable disease characterized by extraskeletal bone formation through endochondral ossification. Patients with FOP harbor point mutations in ACVR1, a type I receptor for BMPs. Although mutated ACVR1 (FOP-ACVR1) has been shown to render hyperactivity in BMP signaling, we and others have uncovered a mechanism by which FOP-ACVR1 mistransduces BMP signaling in response to Activin-A, a molecule that normally transduces TGF-β signaling. Although Activin-A evokes enhanced chondrogenesis in vitro and heterotopic ossification (HO) in vivo, the underlying mechanisms have yet to be revealed. To this end, we developed a high-throughput screening (HTS) system using FOP patient-derived induced pluripotent stem cells (FOP-iPSCs) to identify pivotal pathways in enhanced chondrogenesis that are initiated by Activin-A. In a screen of 6,809 small-molecule compounds, we identified mTOR signaling as a critical pathway for the aberrant chondrogenesis of mesenchymal stromal cells derived from FOP-iPSCs (FOP-iMSCs). Two different HO mouse models, an FOP model mouse expressing FOP-ACVR1 and an FOP-iPSC-based HO model mouse, revealed critical roles for mTOR signaling in vivo. Moreover, we identified ENPP2, an enzyme that generates lysophosphatidic acid, as a linker of FOP-ACVR1 and mTOR signaling in chondrogenesis. These results uncovered the crucial role of the Activin-A/FOP-ACVR1/ENPP2/mTOR axis in FOP pathogenesis.
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Affiliation(s)
- Kyosuke Hino
- Department of Cell Growth and Differentiation, Center for iPS Cell Research and Application, Kyoto University, Kyoto, Japan.,iPS Cell-Based Drug Discovery, Sumitomo Dainippon Pharma Co., Ltd., Osaka, Japan
| | - Kazuhiko Horigome
- Department of Cell Growth and Differentiation, Center for iPS Cell Research and Application, Kyoto University, Kyoto, Japan.,iPS Cell-Based Drug Discovery, Sumitomo Dainippon Pharma Co., Ltd., Osaka, Japan
| | - Megumi Nishio
- Department of Tissue Regeneration, Institute for Frontier Life and Medical Sciences, and
| | - Shingo Komura
- Department of Life Science Frontiers, Center for iPS Cell Research and Application, Kyoto University, Kyoto, Japan.,Department of Orthopaedic Surgery, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Sanae Nagata
- Department of Cell Growth and Differentiation, Center for iPS Cell Research and Application, Kyoto University, Kyoto, Japan
| | - Chengzhu Zhao
- Department of Life Science Frontiers, Center for iPS Cell Research and Application, Kyoto University, Kyoto, Japan
| | - Yonghui Jin
- Department of Tissue Regeneration, Institute for Frontier Life and Medical Sciences, and.,Institute for Advancement of Clinical and Translational Science (iACT), Kyoto University Hospital, Kyoto, Japan
| | - Koichi Kawakami
- Division of Molecular and Developmental Biology, National Institute of Genetics, Shizuoka, Japan.,Department of Genetics, Graduate University for Advanced Studies (SOKENDAI), Shizuoka, Japan
| | - Yasuhiro Yamada
- Department of Life Science Frontiers, Center for iPS Cell Research and Application, Kyoto University, Kyoto, Japan.,Institute for Integrated Cell-Material Sciences (WPI-iCeMS)
| | - Akira Ohta
- Department of Fundamental Cell Technology, Center for iPS Cell Research and Application, and
| | - Junya Toguchida
- Department of Cell Growth and Differentiation, Center for iPS Cell Research and Application, Kyoto University, Kyoto, Japan.,Department of Tissue Regeneration, Institute for Frontier Life and Medical Sciences, and.,Institute for Advancement of Clinical and Translational Science (iACT), Kyoto University Hospital, Kyoto, Japan.,Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Makoto Ikeya
- Department of Life Science Frontiers, Center for iPS Cell Research and Application, Kyoto University, Kyoto, Japan
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27
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Pan H, Zhang H, Abraham P, Komatsu Y, Lyons K, Kaartinen V, Mishina Y. BmpR1A is a major type 1 BMP receptor for BMP-Smad signaling during skull development. Dev Biol 2017. [PMID: 28641928 DOI: 10.1016/j.ydbio.2017.06.020] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Craniosynostosis is caused by premature fusion of one or more sutures in an infant skull, resulting in abnormal facial features. The molecular and cellular mechanisms by which genetic mutations cause craniosynostosis are incompletely characterized, and many of the causative genes for diverse types of syndromic craniosynostosis have not yet been identified. We previously demonstrated that augmentation of BMP signaling mediated by a constitutively active BMP type IA receptor (ca-BmpR1A) in neural crest cells (ca1A hereafter) causes craniosynostosis and superimposition of heterozygous null mutation of Bmpr1a rescues premature suture fusion (ca1A;1aH hereafter). In this study, we superimposed heterozygous null mutations of the other two BMP type I receptors, Bmpr1b and Acvr1 (ca1A;1bH and ca1A;AcH respectively hereafter) to further dissect involvement of BMP-Smad signaling. Unlike caA1;1aH, ca1A;1bH and ca1A;AcH did not restore the craniosynostosis phenotypes. In our in vivo study, Smad-dependent BMP signaling was decreased to normal levels in mut;1aH mice. However, BMP receptor-regulated Smads (R-Smads; pSmad1/5/9 hereafter) levels were comparable between ca1A, ca1A;1bH and ca1A;AcH mice, and elevated compared to control mice. Bmpr1a, Bmpr1b and Acvr1 null cells were used to examine potential mechanisms underlying the differences in ability of heterozygosity for Bmpr1a vs. Bmpr1b or Acvr1 to rescue the mut phenotype. pSmad1/5/9 level was undetectable in Bmpr1a homozygous null cells while pSmad1/5/9 levels did not decrease in Bmpr1b or Acvr1 homozygous null cells. Taken together, our study indicates that different levels of expression and subsequent activation of Smad signaling differentially contribute each BMP type I receptor to BMP-Smad signaling and craniofacial development. These results also suggest differential involvement of each type 1 receptor in pathogenesis of syndromic craniosynostoses.
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Affiliation(s)
- Haichun Pan
- Department of Biologic & Materials Sciences, School of Dentistry, University of Michigan, 1011 N. University Ave., Ann Arbor, MI 48109, USA
| | - Honghao Zhang
- Department of Biologic & Materials Sciences, School of Dentistry, University of Michigan, 1011 N. University Ave., Ann Arbor, MI 48109, USA
| | - Ponnu Abraham
- Department of Biologic & Materials Sciences, School of Dentistry, University of Michigan, 1011 N. University Ave., Ann Arbor, MI 48109, USA
| | - Yoshihiro Komatsu
- Department of Biologic & Materials Sciences, School of Dentistry, University of Michigan, 1011 N. University Ave., Ann Arbor, MI 48109, USA; Department of Pediatrics, The University of Texas Medical School at Houston, Houston, TX, USA
| | - Karen Lyons
- Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, Los Angeles, CA, USA
| | - Vesa Kaartinen
- Department of Biologic & Materials Sciences, School of Dentistry, University of Michigan, 1011 N. University Ave., Ann Arbor, MI 48109, USA
| | - Yuji Mishina
- Department of Biologic & Materials Sciences, School of Dentistry, University of Michigan, 1011 N. University Ave., Ann Arbor, MI 48109, USA.
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28
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Lee HW, Chong DC, Ola R, Dunworth WP, Meadows S, Ka J, Kaartinen VM, Qyang Y, Cleaver O, Bautch VL, Eichmann A, Jin SW. Alk2/ACVR1 and Alk3/BMPR1A Provide Essential Function for Bone Morphogenetic Protein-Induced Retinal Angiogenesis. Arterioscler Thromb Vasc Biol 2017; 37:657-663. [PMID: 28232325 DOI: 10.1161/atvbaha.116.308422] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Accepted: 02/09/2017] [Indexed: 12/16/2022]
Abstract
OBJECTIVE Increasing evidence suggests that bone morphogenetic protein (BMP) signaling regulates angiogenesis. Here, we aimed to define the function of BMP receptors in regulating early postnatal angiogenesis by analysis of inducible, endothelial-specific deletion of the BMP receptor components Bmpr2 (BMP type 2 receptor), Alk1 (activin receptor-like kinase 1), Alk2, and Alk3 in mouse retinal vessels. APPROACH AND RESULTS Expression analysis of several BMP ligands showed that proangiogenic BMP ligands are highly expressed in postnatal retinas. Consistently, BMP receptors are also strongly expressed in retina with a distinct pattern. To assess the function of BMP signaling in retinal angiogenesis, we first generated mice carrying an endothelial-specific inducible deletion of Bmpr2. Postnatal deletion of Bmpr2 in endothelial cells substantially decreased the number of angiogenic sprouts at the vascular front and branch points behind the front, leading to attenuated radial expansion. To identify critical BMPR1s (BMP type 1 receptors) associated with BMPR2 in retinal angiogenesis, we generated endothelial-specific inducible deletion of 3 BMPR1s abundantly expressed in endothelial cells and analyzed the respective phenotypes. Among these, endothelial-specific deletion of either Alk2/acvr1 or Alk3/Bmpr1a caused a delay in radial expansion, reminiscent of vascular defects associated with postnatal endothelial-specific deletion of BMPR2, suggesting that ALK2/ACVR1 and ALK3/BMPR1A are likely to be the critical BMPR1s necessary for proangiogenic BMP signaling in retinal vessels. CONCLUSIONS Our data identify BMP signaling mediated by coordination of ALK2/ACVR1, ALK3/BMPR1A, and BMPR2 as an essential proangiogenic cue for retinal vessels.
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Affiliation(s)
- Heon-Woo Lee
- From the Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT (H.-W.L., R.O., W.P.D., Y.Q., A.E., S.-W.J.); Department of Biology and McAllister Heart Institute, University of North Carolina, Chapel Hill (D.C.C., V.L.B.); Department of Molecular Biology, UT Southwestern Medical Center, Dallas, TX (S.M., O.C.); School of Life Sciences and Cell Logistics Research Center, Gwangju Institute of Science and Technology, Korea (J.K., S.-W.J.); and Department of Biologic & Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor (V.M.K.)
| | - Diana C Chong
- From the Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT (H.-W.L., R.O., W.P.D., Y.Q., A.E., S.-W.J.); Department of Biology and McAllister Heart Institute, University of North Carolina, Chapel Hill (D.C.C., V.L.B.); Department of Molecular Biology, UT Southwestern Medical Center, Dallas, TX (S.M., O.C.); School of Life Sciences and Cell Logistics Research Center, Gwangju Institute of Science and Technology, Korea (J.K., S.-W.J.); and Department of Biologic & Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor (V.M.K.)
| | - Roxana Ola
- From the Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT (H.-W.L., R.O., W.P.D., Y.Q., A.E., S.-W.J.); Department of Biology and McAllister Heart Institute, University of North Carolina, Chapel Hill (D.C.C., V.L.B.); Department of Molecular Biology, UT Southwestern Medical Center, Dallas, TX (S.M., O.C.); School of Life Sciences and Cell Logistics Research Center, Gwangju Institute of Science and Technology, Korea (J.K., S.-W.J.); and Department of Biologic & Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor (V.M.K.)
| | - William P Dunworth
- From the Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT (H.-W.L., R.O., W.P.D., Y.Q., A.E., S.-W.J.); Department of Biology and McAllister Heart Institute, University of North Carolina, Chapel Hill (D.C.C., V.L.B.); Department of Molecular Biology, UT Southwestern Medical Center, Dallas, TX (S.M., O.C.); School of Life Sciences and Cell Logistics Research Center, Gwangju Institute of Science and Technology, Korea (J.K., S.-W.J.); and Department of Biologic & Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor (V.M.K.)
| | - Stryder Meadows
- From the Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT (H.-W.L., R.O., W.P.D., Y.Q., A.E., S.-W.J.); Department of Biology and McAllister Heart Institute, University of North Carolina, Chapel Hill (D.C.C., V.L.B.); Department of Molecular Biology, UT Southwestern Medical Center, Dallas, TX (S.M., O.C.); School of Life Sciences and Cell Logistics Research Center, Gwangju Institute of Science and Technology, Korea (J.K., S.-W.J.); and Department of Biologic & Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor (V.M.K.)
| | - Jun Ka
- From the Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT (H.-W.L., R.O., W.P.D., Y.Q., A.E., S.-W.J.); Department of Biology and McAllister Heart Institute, University of North Carolina, Chapel Hill (D.C.C., V.L.B.); Department of Molecular Biology, UT Southwestern Medical Center, Dallas, TX (S.M., O.C.); School of Life Sciences and Cell Logistics Research Center, Gwangju Institute of Science and Technology, Korea (J.K., S.-W.J.); and Department of Biologic & Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor (V.M.K.)
| | - Vesa M Kaartinen
- From the Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT (H.-W.L., R.O., W.P.D., Y.Q., A.E., S.-W.J.); Department of Biology and McAllister Heart Institute, University of North Carolina, Chapel Hill (D.C.C., V.L.B.); Department of Molecular Biology, UT Southwestern Medical Center, Dallas, TX (S.M., O.C.); School of Life Sciences and Cell Logistics Research Center, Gwangju Institute of Science and Technology, Korea (J.K., S.-W.J.); and Department of Biologic & Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor (V.M.K.)
| | - Yibing Qyang
- From the Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT (H.-W.L., R.O., W.P.D., Y.Q., A.E., S.-W.J.); Department of Biology and McAllister Heart Institute, University of North Carolina, Chapel Hill (D.C.C., V.L.B.); Department of Molecular Biology, UT Southwestern Medical Center, Dallas, TX (S.M., O.C.); School of Life Sciences and Cell Logistics Research Center, Gwangju Institute of Science and Technology, Korea (J.K., S.-W.J.); and Department of Biologic & Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor (V.M.K.)
| | - Ondine Cleaver
- From the Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT (H.-W.L., R.O., W.P.D., Y.Q., A.E., S.-W.J.); Department of Biology and McAllister Heart Institute, University of North Carolina, Chapel Hill (D.C.C., V.L.B.); Department of Molecular Biology, UT Southwestern Medical Center, Dallas, TX (S.M., O.C.); School of Life Sciences and Cell Logistics Research Center, Gwangju Institute of Science and Technology, Korea (J.K., S.-W.J.); and Department of Biologic & Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor (V.M.K.)
| | - Victoria L Bautch
- From the Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT (H.-W.L., R.O., W.P.D., Y.Q., A.E., S.-W.J.); Department of Biology and McAllister Heart Institute, University of North Carolina, Chapel Hill (D.C.C., V.L.B.); Department of Molecular Biology, UT Southwestern Medical Center, Dallas, TX (S.M., O.C.); School of Life Sciences and Cell Logistics Research Center, Gwangju Institute of Science and Technology, Korea (J.K., S.-W.J.); and Department of Biologic & Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor (V.M.K.).
| | - Anne Eichmann
- From the Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT (H.-W.L., R.O., W.P.D., Y.Q., A.E., S.-W.J.); Department of Biology and McAllister Heart Institute, University of North Carolina, Chapel Hill (D.C.C., V.L.B.); Department of Molecular Biology, UT Southwestern Medical Center, Dallas, TX (S.M., O.C.); School of Life Sciences and Cell Logistics Research Center, Gwangju Institute of Science and Technology, Korea (J.K., S.-W.J.); and Department of Biologic & Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor (V.M.K.)
| | - Suk-Won Jin
- From the Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT (H.-W.L., R.O., W.P.D., Y.Q., A.E., S.-W.J.); Department of Biology and McAllister Heart Institute, University of North Carolina, Chapel Hill (D.C.C., V.L.B.); Department of Molecular Biology, UT Southwestern Medical Center, Dallas, TX (S.M., O.C.); School of Life Sciences and Cell Logistics Research Center, Gwangju Institute of Science and Technology, Korea (J.K., S.-W.J.); and Department of Biologic & Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor (V.M.K.)
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29
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Sun R, Sun YC, Ge W, Tan H, Cheng SF, Yin S, Sun XF, Li L, Dyce P, Li J, Yang X, Shi QH, Shen W. The crucial role of Activin A on the formation of primordial germ cell-like cells from skin-derived stem cells in vitro. Cell Cycle 2016; 14:3016-29. [PMID: 26406115 DOI: 10.1080/15384101.2015.1078031] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Primordial germ cells (PGCs) are founder cells of the germ cell lineage, and can be differentiated from stem cells in an induced system in vitro. However, the induction conditions need to be optimized in order to improve the differentiation efficiency. Activin A (ActA) is a member of the TGF-β super family and plays an important role in oogenesis and folliculogenesis. In the present study, we found that ActA promoted PGC-like cells (PGCLCs) formation from mouse skin-derived stem cells (SDSCs) in both embryoid body-like structure (EBLS) differentiation and the co-culture stage in a dose dependent manner. ActA treatment (100 ng/ml) during EBLS differentiation stage and further co-cultured for 6 days without ActA significantly increased PGCLCs from 53.2% to 82.8%, and as well as EBLS differentiation without ActA followed by co-cultured with 100 ng/ml ActA for 4 to 12 days with the percentage of PGCLCs increasing markedly in vitro. Moreover, mice treated with ActA at 100 ng/kg body weight from embryonic day (E) 5.5-12.5 led to more PGCs formation. However, the stimulating effects of ActA were interrupted by Smad3 RNAi, and in an in vitro cultured Smad3(-/-) mouse skin cells scenario. SMAD3 is thus likely a key effecter molecule in the ActA signaling pathway. In addition, we found that the expression of some epiblast cell markers, Fgf5, Dnmt3a, Dnmt3b and Wnt3, was increased in EBLSs cultured for 4 days or PGCLCs co-cultured for 12 days with ActA treatment. Interestingly, at 16 days of differentiation, the percentage of PGCLCs was decreased in the presence of ActA, but the expression of meiosis-relative genes, such as Stra8, Dmc1, Sycp3 and Sycp1, was increased. In conclusion, our data here demonstrated that ActA can promote PGCLC formation from SDSCs in vitro, at early stages of differentiation, and affect meiotic initiation of PGCLCs in later stages.
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Affiliation(s)
- Rui Sun
- a Molecular and Cell Genetics Laboratory; The CAS Key Laboratory of Innate Immunity and Chronic Disease; Hefei National Laboratory for Physical Sciences at Microscale; School of Life Sciences; University of Science and Technology of China ; Hefei , Anhui , China
| | - Yuan-Chao Sun
- b Institute of Reproductive Sciences; Qingdao Agricultural University , Qingdao ; Shandong , China.,c Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong; College of Animal Science and Technology; Qingdao Agricultural University , Qingdao ; Shandong , China
| | - Wei Ge
- b Institute of Reproductive Sciences; Qingdao Agricultural University , Qingdao ; Shandong , China.,c Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong; College of Animal Science and Technology; Qingdao Agricultural University , Qingdao ; Shandong , China
| | - Hui Tan
- b Institute of Reproductive Sciences; Qingdao Agricultural University , Qingdao ; Shandong , China.,c Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong; College of Animal Science and Technology; Qingdao Agricultural University , Qingdao ; Shandong , China
| | - Shun-Feng Cheng
- b Institute of Reproductive Sciences; Qingdao Agricultural University , Qingdao ; Shandong , China.,c Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong; College of Animal Science and Technology; Qingdao Agricultural University , Qingdao ; Shandong , China
| | - Shen Yin
- b Institute of Reproductive Sciences; Qingdao Agricultural University , Qingdao ; Shandong , China.,c Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong; College of Animal Science and Technology; Qingdao Agricultural University , Qingdao ; Shandong , China
| | - Xiao-Feng Sun
- b Institute of Reproductive Sciences; Qingdao Agricultural University , Qingdao ; Shandong , China.,c Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong; College of Animal Science and Technology; Qingdao Agricultural University , Qingdao ; Shandong , China
| | - Lan Li
- b Institute of Reproductive Sciences; Qingdao Agricultural University , Qingdao ; Shandong , China.,c Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong; College of Animal Science and Technology; Qingdao Agricultural University , Qingdao ; Shandong , China
| | - Paul Dyce
- d Department of Animal and Poultry Science ; University of Guelph ; Guelph ; Ontario , Canada
| | - Julang Li
- d Department of Animal and Poultry Science ; University of Guelph ; Guelph ; Ontario , Canada
| | - Xiao Yang
- e Genetic Laboratory of Development and Diseases; Beijing Institute of Biotechnology ; Beijing , China
| | - Qing-Hua Shi
- a Molecular and Cell Genetics Laboratory; The CAS Key Laboratory of Innate Immunity and Chronic Disease; Hefei National Laboratory for Physical Sciences at Microscale; School of Life Sciences; University of Science and Technology of China ; Hefei , Anhui , China.,f Collaborative Innovation Center of Genetics and Development; Fudan University ; Shanghai , China
| | - Wei Shen
- b Institute of Reproductive Sciences; Qingdao Agricultural University , Qingdao ; Shandong , China.,c Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong; College of Animal Science and Technology; Qingdao Agricultural University , Qingdao ; Shandong , China
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30
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Deletion of BMP receptor type IB decreased bone mass in association with compromised osteoblastic differentiation of bone marrow mesenchymal progenitors. Sci Rep 2016; 6:24256. [PMID: 27048979 PMCID: PMC4822175 DOI: 10.1038/srep24256] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 03/23/2016] [Indexed: 01/03/2023] Open
Abstract
We previously found that disruption of two type I BMP receptors, Bmpr1a and Acvr1, respectively, in an osteoblast-specific manner, increased bone mass in mice. BMPR1B, another BMP type I receptor, is also capable of binding to BMP ligands and transduce BMP signaling. However, little is known about the function of BMPR1B in bone. In this study, we investigated the bone phenotype in Bmpr1b null mice and the impacts of loss of Bmpr1b on osteoblasts and osteoclasts. We found that deletion of Bmpr1b resulted in osteopenia in 8-week-old male mice, and the phenotype was transient and gender specific. The decreased bone mass was neither due to the changes in osteoblastic bone formation activity nor osteoclastic bone resorption activity in vivo. In vitro differentiation of Bmpr1b null osteoclasts was increased but resorption activity was decreased. Calvarial pre-osteoblasts from Bmpr1b mutant showed comparable differentiation capability in vitro, while they showed increased BMP-SMAD signaling in culture. Different from calvarial pre-osteoblasts, Bmpr1b mutant bone marrow mesenchymal progenitors showed compromised differentiation in vitro, which may be a reason for the osteopenic phenotype in the mutant mice. In conclusion, our results suggested that BMPR1B plays distinct roles from BMPR1A and ACVR1 in maintaining bone mass and transducing BMP signaling.
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Common mutations in ALK2/ACVR1, a multi-faceted receptor, have roles in distinct pediatric musculoskeletal and neural orphan disorders. Cytokine Growth Factor Rev 2015; 27:93-104. [PMID: 26776312 DOI: 10.1016/j.cytogfr.2015.12.007] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Activin receptor-like kinase-2 (ALK2), the product of ACVR1, is a member of the type I bone morphogenetic protein (BMP) receptor family. ALK2 exerts key and non-redundant roles in numerous developmental processes, including the specification, growth and morphogenesis of endochondral skeletal elements. There is also strong evidence that BMP signaling plays important roles in determination, differentiation and function of neural cells and tissues. Here we focus on the intriguing discovery that common activating mutations in ALK2 occur in Fibrodysplasia Ossificans Progressiva (FOP) and Diffuse Intrinsic Pontine Gliomas (DIPGs), distinct pediatric disorders of significant severity that are associated with premature death. Pathogenesis and treatment remain elusive for both. We consider recent studies on the nature of the ACVR1 mutations, possible modes of action and targets, and plausible therapeutic measures. Comparisons of the diverse - but genetically interrelated - pathologies of FOP and DIPG will continue to be of major mutual benefit with broad biomedical and clinical relevance.
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Abstract
Fibrodysplasia ossificans progressiva (FOP) is a rare genetic disease characterized by extraskeletal bone formation through endochondral ossification. FOP patients harbor point mutations in ACVR1 (also known as ALK2), a type I receptor for bone morphogenetic protein (BMP). Two mechanisms of mutated ACVR1 (FOP-ACVR1) have been proposed: ligand-independent constitutive activity and ligand-dependent hyperactivity in BMP signaling. Here, by using FOP patient-derived induced pluripotent stem cells (FOP-iPSCs), we report a third mechanism, where FOP-ACVR1 abnormally transduces BMP signaling in response to Activin-A, a molecule that normally transduces TGF-β signaling but not BMP signaling. Activin-A enhanced the chondrogenesis of induced mesenchymal stromal cells derived from FOP-iPSCs (FOP-iMSCs) via aberrant activation of BMP signaling in addition to the normal activation of TGF-β signaling in vitro, and induced endochondral ossification of FOP-iMSCs in vivo. These results uncover a novel mechanism of extraskeletal bone formation in FOP and provide a potential new therapeutic strategy for FOP.
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Huse JT, Rosenblum MK. The Emerging Molecular Foundations of Pediatric Brain Tumors. J Child Neurol 2015; 30:1838-50. [PMID: 25873586 DOI: 10.1177/0883073815579709] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Accepted: 03/10/2015] [Indexed: 01/23/2023]
Abstract
Recent years have witnessed extensive molecular characterization of several pediatric brain tumor variants. These studies have dramatically shifted notions of disease classification and are likely to have similarly profound effects on patient management in the near future. In this review, we cover the molecular foundations of low-grade glial and glioneuronal neoplasms, high-grade glioma, ependymoma, and medulloblastoma, the details of which have only been recently elucidated in many cases. In doing so, we describe an array of biomarkers likely to play a major role in clinically relevant molecular stratification moving forward. We also discuss strategies for robust and efficient biomarker assessment in the clinical environment.
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Affiliation(s)
- Jason T Huse
- Department of Pathology and Memorial Sloan-Kettering Cancer Center, New York, NY, USA Human Oncology and Pathogenesis Program, Memorial Sloan-Kettering Cancer Center, New York, NY, USA
| | - Marc K Rosenblum
- Department of Pathology and Memorial Sloan-Kettering Cancer Center, New York, NY, USA
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Agarwal S, Loder SJ, Brownley C, Eboda O, Peterson JR, Hayano S, Wu B, Zhao B, Kaartinen V, Wong VC, Mishina Y, Levi B. BMP signaling mediated by constitutively active Activin type 1 receptor (ACVR1) results in ectopic bone formation localized to distal extremity joints. Dev Biol 2015; 400:202-9. [PMID: 25722188 DOI: 10.1016/j.ydbio.2015.02.011] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Revised: 02/11/2015] [Accepted: 02/15/2015] [Indexed: 10/24/2022]
Abstract
BMP signaling mediated by ACVR1 plays a critical role for development of multiple structures including the cardiovascular and skeletal systems. While deficient ACVR1 signaling impairs normal embryonic development, hyperactive ACVR1 function (R206H in humans and Q207D mutation in mice, ca-ACVR1) results in formation of heterotopic ossification (HO). We developed a mouse line, which conditionally expresses ca-ACVR1 with Nfatc1-Cre(+) transgene. Mutant mice developed ectopic cartilage and bone at the distal joints of the extremities including the interphalangeal joints and hind limb ankles as early as P4 in the absence of trauma or exogenous bone morphogenetic protein (BMP) administration. Micro-CT showed that even at later time points (up to P40), cartilage and bone development persisted at the affected joints most prominently in the ankle. Interestingly, this phenotype was not present in areas of bone outside of the joints - tibia are normal in mutants and littermate controls away from the ankle. These findings demonstrate that this model may allow for further studies of heterotopic ossification, which does not require the use of stem cells, direct trauma or activation with exogenous Cre gene administration.
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Affiliation(s)
- Shailesh Agarwal
- University of Michigan Medical School, Department of Surgery, Ann Arbor, MI, USA
| | - Shawn J Loder
- University of Michigan Medical School, Department of Surgery, Ann Arbor, MI, USA
| | - Cameron Brownley
- University of Michigan Medical School, Department of Surgery, Ann Arbor, MI, USA
| | - Oluwatobi Eboda
- University of Michigan Medical School, Department of Surgery, Ann Arbor, MI, USA
| | - Jonathan R Peterson
- University of Michigan Medical School, Department of Surgery, Ann Arbor, MI, USA
| | - Satoru Hayano
- University of Michigan, School of Dentistry, Department of Biologic and Materials Sciences, Ann Arbor, MI, USA
| | - Bingrou Wu
- Albert Einstein College of Medicine, Department of Genetics, Bronx, New York, USA
| | - Bin Zhao
- Albert Einstein College of Medicine, Department of Genetics, Bronx, New York, USA
| | - Vesa Kaartinen
- University of Michigan, School of Dentistry, Department of Biologic and Materials Sciences, Ann Arbor, MI, USA
| | - Victor C Wong
- Johns Hopkins University, Department of Plastic Surgery, Baltimore, MD, USA
| | - Yuji Mishina
- University of Michigan, School of Dentistry, Department of Biologic and Materials Sciences, Ann Arbor, MI, USA.
| | - Benjamin Levi
- University of Michigan Medical School, Department of Surgery, Ann Arbor, MI, USA.
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35
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Molecular Biology of Pediatric Brain Tumors and Impact on Novel Therapies. Curr Neurol Neurosci Rep 2015; 15:10. [DOI: 10.1007/s11910-015-0532-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Lim J, Tu X, Choi K, Akiyama H, Mishina Y, Long F. BMP-Smad4 signaling is required for precartilaginous mesenchymal condensation independent of Sox9 in the mouse. Dev Biol 2015; 400:132-8. [PMID: 25641697 DOI: 10.1016/j.ydbio.2015.01.022] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Revised: 12/30/2014] [Accepted: 01/19/2015] [Indexed: 10/24/2022]
Abstract
Bone morphogenetic proteins (BMPs) regulate multiple aspects of skeletal development in vertebrates. Although exogenously applied BMPs can induce chondrogenesis de novo, the role and mechanism of physiologic BMP signaling during precartilaginous mesenchymal condensation is not well understood. By deleting the type I BMP receptors or the transcription factor Smad4 in the limb bud mesenchyme, we find that loss of BMP-Smad signaling abolishes skeletal development due to a failure in mesenchymal condensation. In the absence of Smad4, expression of Sox9, an essential transcription factor for chondrogenesis, initiates normally in the proximal mesenchyme of the limb bud, but fails to maintain its level or expand to the more distal territory at the later stages. However, forced-expression of Sox9 does not restore cartilage formation in the Smad4-deficeint embryo. In vitro micromass cultures show that the Smad4-deficient cells fail to condense in a cell-autonomous manner, even though they express several cell adhesion molecules either normally or even at a higher level. Thus, BMP-Smad signaling critically controls mesenchymal condensation to initiate skeletal development likely through a Sox9-independent mechanism.
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Affiliation(s)
- Joohyun Lim
- Department of Orthopaedic Surgery, Washington University School of Medicine, St. Louis, MO 63110, United States; Division of Biology and Biomedical Sciences, Washington University School of Medicine, St. Louis, MO 63110, United States
| | - Xiaolin Tu
- Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110, United States
| | - Kyunghee Choi
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, United States
| | - Haruhiko Akiyama
- Department of Orthopaedic Surgery, Kyoto University, Kyoto, Japan
| | - Yuji Mishina
- Department of Biologic and Materials Sciences, the University of Michigan School of Dentistry, Ann Arbor, MI 48109, United States
| | - Fanxin Long
- Department of Orthopaedic Surgery, Washington University School of Medicine, St. Louis, MO 63110, United States; Division of Biology and Biomedical Sciences, Washington University School of Medicine, St. Louis, MO 63110, United States; Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110, United States; Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO 63110, United States.
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37
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Recurrent somatic mutations in ACVR1 in pediatric midline high-grade astrocytoma. Nat Genet 2014; 46:462-6. [PMID: 24705250 DOI: 10.1038/ng.2950] [Citation(s) in RCA: 325] [Impact Index Per Article: 32.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2013] [Accepted: 03/14/2014] [Indexed: 12/24/2022]
Abstract
Pediatric midline high-grade astrocytomas (mHGAs) are incurable with few treatment targets identified. Most tumors harbor mutations encoding p.Lys27Met in histone H3 variants. In 40 treatment-naive mHGAs, 39 analyzed by whole-exome sequencing, we find additional somatic mutations specific to tumor location. Gain-of-function mutations in ACVR1 occur in tumors of the pons in conjunction with histone H3.1 p.Lys27Met substitution, whereas FGFR1 mutations or fusions occur in thalamic tumors associated with histone H3.3 p.Lys27Met substitution. Hyperactivation of the bone morphogenetic protein (BMP)-ACVR1 developmental pathway in mHGAs harboring ACVR1 mutations led to increased levels of phosphorylated SMAD1, SMAD5 and SMAD8 and upregulation of BMP downstream early-response genes in tumor cells. Global DNA methylation profiles were significantly associated with the p.Lys27Met alteration, regardless of the mutant histone H3 variant and irrespective of tumor location, supporting the role of this substitution in driving the epigenetic phenotype. This work considerably expands the number of potential treatment targets and further justifies pretreatment biopsy in pediatric mHGA as a means to orient therapeutic efforts in this disease.
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38
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Anti-Müllerian hormone recruits BMPR-IA in immature granulosa cells. PLoS One 2013; 8:e81551. [PMID: 24312319 PMCID: PMC3842941 DOI: 10.1371/journal.pone.0081551] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Accepted: 10/23/2013] [Indexed: 01/24/2023] Open
Abstract
Anti-Müllerian hormone (AMH) is a member of the TGF-β superfamily secreted by the gonads of both sexes. This hormone is primarily known for its role in the regression of the Müllerian ducts in male fetuses. In females, AMH is expressed in granulosa cells of developing follicles. Like other members of the TGF-β superfamily, AMH transduces its signal through two transmembrane serine/threonine kinase receptors including a well characterized type II receptor, AMHR-II. The complete signalling pathway of AMH involving Smads proteins and the type I receptor is well known in the Müllerian duct and in Sertoli and Leydig cells but not in granulosa cells. In addition, few AMH target genes have been identified in these cells. Finally, while several co-receptors have been reported for members of the TGF-β superfamily, none have been described for AMH. Here, we have shown that none of the Bone Morphogenetic Proteins (BMPs) co-receptors, Repulsive guidance molecules (RGMs), were essential for AMH signalling. We also demonstrated that the main Smad proteins used by AMH in granulosa cells were Smad 1 and Smad 5. Like for the other AMH target cells, the most important type I receptor for AMH in these cells was BMPR-IA. Finally, we have identified a new AMH target gene, Id3, which could be involved in the effects of AMH on the differentiation of granulosa cells and its other target cells.
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Activin-like kinase 2 functions in peri-implantation uterine signaling in mice and humans. PLoS Genet 2013; 9:e1003863. [PMID: 24244176 PMCID: PMC3828128 DOI: 10.1371/journal.pgen.1003863] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Accepted: 08/22/2013] [Indexed: 01/19/2023] Open
Abstract
Implantation of a blastocyst in the uterus is a multistep process tightly controlled by an intricate regulatory network of interconnected ovarian, uterine, and embryonic factors. Bone morphogenetic protein (BMP) ligands and receptors are expressed in the uterus of pregnant mice, and BMP2 has been shown to be a key regulator of implantation. In this study, we investigated the roles of the BMP type 1 receptor, activin-like kinase 2 (ALK2), during mouse pregnancy by producing mice carrying a conditional ablation of Alk2 in the uterus (Alk2 cKO mice). In the absence of ALK2, embryos demonstrate delayed invasion into the uterine epithelium and stroma, and upon implantation, stromal cells fail to undergo uterine decidualization, resulting in sterility. Mechanistically, microarray analysis revealed that CCAAT/enhancer-binding protein β (Cebpb) expression is suppressed during decidualization in Alk2 cKO females. These findings and the similar phenotypes of Cebpb cKO and Alk2 cKO mice lead to the hypothesis that BMPs act upstream of CEBPB in the stroma to regulate decidualization. To test this hypothesis, we knocked down ALK2 in human uterine stromal cells (hESC) and discovered that ablation of ALK2 alters hESC decidualization and suppresses CEBPB mRNA and protein levels. Chromatin immunoprecipitation (ChIP) analysis of decidualizing hESC confirmed that BMP signaling proteins, SMAD1/5, directly regulate expression of CEBPB by binding a distinct regulatory sequence in the 3′ UTR of this gene; CEBPB, in turn, regulates the expression of progesterone receptor (PGR). Our work clarifies the conserved mechanisms through which BMPs regulate peri-implantation in rodents and primates and, for the first time, uncovers a linear pathway of BMP signaling through ALK2 to regulate CEBPB and, subsequently, PGR during decidualization. A couple is defined as infertile when failing to become pregnant after one year of regular, unprotected intercourse. Infertility affects more than 10% of couples. The implantation of the embryo in the uterus is one of the most critical steps of pregnancy, and it has been estimated that 75% of pregnancy fails because of peri-implantation defects. An intricate network of molecular pathways regulates the peri-implantation process. It is known that the bone morphogenetic protein (BMP) pathways are part of this network, and herein we investigated how one of the BMP signaling receptors interacts with other factors in the uterus. Our results show an essential and conserved role of this BMP receptor during the implantation of the embryo in mice and humans. Furthermore, we discovered that BMPs act in a linear pathway upstream of two other key regulators of implantation, CEBPB and PGR.
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40
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Le Dréau G, Martí E. The multiple activities of BMPs during spinal cord development. Cell Mol Life Sci 2013; 70:4293-305. [PMID: 23673983 PMCID: PMC11113619 DOI: 10.1007/s00018-013-1354-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Revised: 04/25/2013] [Accepted: 04/29/2013] [Indexed: 12/19/2022]
Abstract
Bone morphogenetic proteins (BMPs) are one of the main classes of multi-faceted secreted factors that drive vertebrate development. A growing body of evidence indicates that BMPs contribute to the formation of the central nervous system throughout its development, from the initial shaping of the neural primordium to the generation and maturation of the different cell types that form the functional adult nervous tissue. In this review, we focus on the multiple activities of BMPs during spinal cord development, paying particular attention to recent results that highlight the complexity of BMP signaling during this process. These findings emphasize the unique capacity of these signals to mediate various functions in the same tissue throughout development, recruiting diverse effectors and strategies to instruct their target cells.
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Affiliation(s)
- Gwenvael Le Dréau
- Instituto de Biología Molecular de Barcelona, CSIC, Parc Científic de Barcelona, C/Baldiri i Reixac 10-15, 08028 Barcelona, Spain
| | - Elisa Martí
- Instituto de Biología Molecular de Barcelona, CSIC, Parc Científic de Barcelona, C/Baldiri i Reixac 10-15, 08028 Barcelona, Spain
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41
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Abstract
Müllerian inhibiting substance (MIS) not only induces Müllerian duct regression during male sexual differentiation but also modulates Leydig cell steroidogenic capacity and differentiation. MIS actions are mediated through a complex of homologous receptors: a type II ligand-binding receptor [MIS type II receptor (MISRII)] and a tissue-specific type I receptor that initiates downstream signaling. The putative MIS type I receptors responsible for Müllerian duct regression are activin A type II receptor, type I [Acvr1/activin receptor-like kinase 2 (ALK2)], ALK3, and ALK6, but the one recruited by MIS in Leydig cells is unknown. To identify whether ALK3 is the specific type I receptor partner for MISRII in Leydig cells, we generated Leydig cell-specific ALK3 conditional knockout mice using a Cre-lox system and compared gene expression and steroidogenic capacity in Leydig cells of ALK3(fx/fx)Cyp17(cre+) and control mice (ALK3(fx/fx)Cyp17(cre-) or ALK3(fx/wt)Cyp17(cre-) littermates). We found reduced mRNA expression of the genes encoding P450c17, StAR, and two enzymes (17βHSD-III and 3βHSD-VI) that are expressed in differentiated adult Leydig cells and increased expression of androgen-metabolizing enzymes (3α-HSD and SRD5A2) and proliferating cell nuclear antigen (PCNA) in Leydig cells of ALK3(fx/fx)Cyp17(cre+) mice. Despite down-regulation of steroidogenic capacity in ALK3(fx/fx)Cyp17(cre+) mice, the loss of MIS signaling also stimulates Leydig cell proliferation such that plasma testosterone and androstenedione concentrations are comparable to that of control mice. Collectively, these results indicate that the phenotype in ALK3 conditional knockout mice is similar to that of the MIS-knockout mice, confirming that ALK3 is the primary type I receptor recruited by the MIS-MISRII complex during Leydig cell differentiation.
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Affiliation(s)
- Xiufeng Wu
- Pediatric Endocrine Division, Departments of Pediatrics and Cell Biology, University of Massachusetts Medical School, Worcester, Massachusetts 01655, USA
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42
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Kruithof BPT, Duim SN, Moerkamp AT, Goumans MJ. TGFβ and BMP signaling in cardiac cushion formation: lessons from mice and chicken. Differentiation 2012; 84:89-102. [PMID: 22656450 DOI: 10.1016/j.diff.2012.04.003] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2012] [Revised: 03/28/2012] [Accepted: 04/04/2012] [Indexed: 02/01/2023]
Abstract
Cardiac cushion formation is crucial for both valvular and septal development. Disruption in this process can lead to valvular and septal malformations, which constitute the largest part of congenital heart defects. One of the signaling pathways that is important for cushion formation is the TGFβ superfamily. The involvement of TGFβ and BMP signaling pathways in cardiac cushion formation has been intensively studied using chicken in vitro explant assays and in genetically modified mice. In this review, we will summarize and discuss the role of TGFβ and BMP signaling components in cardiac cushion formation.
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Affiliation(s)
- Boudewijn P T Kruithof
- Department of Molecular Cell Biology, Leiden University Medical Center, Einthovenweg 20, 2333 ZC Leiden, The Netherlands.
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43
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Stuhlmiller TJ, García-Castro MI. Current perspectives of the signaling pathways directing neural crest induction. Cell Mol Life Sci 2012; 69:3715-37. [PMID: 22547091 PMCID: PMC3478512 DOI: 10.1007/s00018-012-0991-8] [Citation(s) in RCA: 178] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2011] [Revised: 03/12/2012] [Accepted: 04/02/2012] [Indexed: 01/05/2023]
Abstract
The neural crest is a migratory population of embryonic cells with a tremendous potential to differentiate and contribute to nearly every organ system in the adult body. Over the past two decades, an incredible amount of research has given us a reasonable understanding of how these cells are generated. Neural crest induction involves the combinatorial input of multiple signaling pathways and transcription factors, and is thought to occur in two phases from gastrulation to neurulation. In the first phase, FGF and Wnt signaling induce NC progenitors at the border of the neural plate, activating the expression of members of the Msx, Pax, and Zic families, among others. In the second phase, BMP, Wnt, and Notch signaling maintain these progenitors and bring about the expression of definitive NC markers including Snail2, FoxD3, and Sox9/10. In recent years, additional signaling molecules and modulators of these pathways have been uncovered, creating an increasingly complex regulatory network. In this work, we provide a comprehensive review of the major signaling pathways that participate in neural crest induction, with a focus on recent developments and current perspectives. We provide a simplified model of early neural crest development and stress similarities and differences between four major model organisms: Xenopus, chick, zebrafish, and mouse.
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Affiliation(s)
- Timothy J Stuhlmiller
- Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, CT 06520-8103, USA
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Progesterone receptor activates Msx2 expression by downregulating TNAP/Akp2 and activating the Bmp pathway in EpH4 mouse mammary epithelial cells. PLoS One 2012; 7:e34058. [PMID: 22457812 PMCID: PMC3310875 DOI: 10.1371/journal.pone.0034058] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Accepted: 02/27/2012] [Indexed: 11/19/2022] Open
Abstract
Previously we demonstrated that EpH4 mouse mammary epithelial cells induced the homeobox transcription factor Msx2 either when transfected with the progesterone receptor (PR) or when treated with Bmp2/4. Msx2 upregulation was unaffected by Wnt inhibitors s-FRP or Dkk1, but was inhibited by the Bmp antagonist Noggin. We therefore hypothesized that PR signaling to Msx2 acts through the Bmp receptor pathway. Herein, we confirm that transcripts for Alk2/ActR1A, a non-canonical BmpR Type I, are upregulated in mammary epithelial cells overexpressing PR (EpH4-PR). Increased phosphorylation of Smads 1,5, 8, known substrates for Alk2 and other BmpR Type I proteins, was observed as was their translocation to the nucleus in EpH4-PR cells. Analysis also showed that Tissue Non-Specific Alkaline Phosphatase (TNAP/Akp2) was also found to be downregulated in EpH4-PR cells. When an Akp2 promoter-reporter construct containing a ½PRE site was transfected into EpH4-PR cells, its expression was downregulated. Moreover, siRNA mediated knockdown of Akp2 increased both Alk2 and Msx2 expression. Collectively these data suggest that PR inhibition of Akp2 results in increased Alk2 activity, increased phosphorylation of Smads 1,5,8, and ultimately upregulation of Msx2. These studies imply that re-activation of the Akp2 gene could be helpful in downregulating aberrant Msx2 expression in PR+ breast cancers.
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Smith KA, Noël E, Thurlings I, Rehmann H, Chocron S, Bakkers J. Bmp and nodal independently regulate lefty1 expression to maintain unilateral nodal activity during left-right axis specification in zebrafish. PLoS Genet 2011; 7:e1002289. [PMID: 21980297 PMCID: PMC3183088 DOI: 10.1371/journal.pgen.1002289] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2011] [Accepted: 07/30/2011] [Indexed: 11/21/2022] Open
Abstract
In vertebrates, left-right (LR) axis specification is determined by a ciliated structure in the posterior region of the embryo. Fluid flow in this ciliated structure is responsible for the induction of unilateral left-sided Nodal activity in the lateral plate mesoderm, which in turn regulates organ laterality. Bmp signalling activity has been implied in repressing Nodal expression on the right side, however its mechanism of action has been controversial. In a forward genetic screen for mutations that affect LR patterning, we identified the zebrafish linkspoot (lin) mutant, characterized by cardiac laterality and mild dorsoventral patterning defects. Mapping of the lin mutation revealed an inactivating missense mutation in the Bmp receptor 1aa (bmpr1aa) gene. Embryos with a mutation in lin/bmpr1aa and a novel mutation in its paralogue, bmpr1ab, displayed a variety of dorsoventral and LR patterning defects with increasing severity corresponding with a decrease in bmpr1a dosage. In Bmpr1a-deficient embryos we observed bilateral expression of the Nodal-related gene, spaw, coupled with reduced expression of the Nodal-antagonist lefty1 in the midline. Using genetic models to induce or repress Bmp activity in combination with Nodal inhibition or activation, we found that Bmp and Nodal regulate lefty1 expression in the midline independently of each other. Furthermore, we observed that the regulation of lefty1 by Bmp signalling is required for its observed downregulation of Nodal activity in the LPM providing a novel explanation for this phenomenon. From these results we propose a two-step model in which Bmp regulates LR patterning. Prior to the onset of nodal flow and Nodal activation, Bmp is required to induce lefty1 expression in the midline. When nodal flow has been established and Nodal activity is apparent, both Nodal and Bmp independently are required for lefty1 expression to assure unilateral Nodal activation and correct LR patterning. Although vertebrates are bilaterally symmetric when observed from the outside, inside the body cavity the organs are positioned asymmetrically with respect to the left and right sides. Cases where all the organs are mirror imaged, known as situs inversus, are not associated with any medical defects. Severe medical problems occur however in infants with a partial organ reversal (situs ambigious or heterotaxia), which arises during embryonic development. Left-right asymmetry in the embryo is established by unilateral expression of Nodal, a member of the Tgf-ß superfamily of secreted growth factors, a role that has been conserved from human to snails. By performing a genetic screen in zebrafish for laterality mutants, we have identified the linkspoot mutant, which displayed partial defects in asymmetric left-right positioning of the internal organs. The gene disrupted in the linkspoot mutant encodes a receptor for bone morphogenetic proteins (Bmp), another member of the Tgf-ß superfamily of secreted growth factors. Further analysis of Bmp over-expression or knock-down models demonstrate that Bmp signalling is required for unilateral Nodal expression, through the initiation and maintenance of an embryonic midline barrier. Our results demonstrate a novel and important mechanism by which left-right asymmetry in the vertebrate embryo is established and regulated.
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Affiliation(s)
- Kelly A. Smith
- Hubrecht Institute, Royal Netherlands Academy of Arts and Sciences (KNAW) and University Medical Center Utrecht, Utrecht, The Netherlands
| | - Emily Noël
- Hubrecht Institute, Royal Netherlands Academy of Arts and Sciences (KNAW) and University Medical Center Utrecht, Utrecht, The Netherlands
| | - Ingrid Thurlings
- Hubrecht Institute, Royal Netherlands Academy of Arts and Sciences (KNAW) and University Medical Center Utrecht, Utrecht, The Netherlands
| | - Holger Rehmann
- University Medical Center Utrecht, Utrecht, The Netherlands
| | - Sonja Chocron
- Hubrecht Institute, Royal Netherlands Academy of Arts and Sciences (KNAW) and University Medical Center Utrecht, Utrecht, The Netherlands
| | - Jeroen Bakkers
- Hubrecht Institute, Royal Netherlands Academy of Arts and Sciences (KNAW) and University Medical Center Utrecht, Utrecht, The Netherlands
- Interuniversity Cardiology Institute of the Netherlands, Utrecht, The Netherlands
- * E-mail:
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Kamiya N, Kaartinen VM, Mishina Y. Loss-of-function of ACVR1 in osteoblasts increases bone mass and activates canonical Wnt signaling through suppression of Wnt inhibitors SOST and DKK1. Biochem Biophys Res Commun 2011; 414:326-30. [PMID: 21945937 DOI: 10.1016/j.bbrc.2011.09.060] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Accepted: 09/13/2011] [Indexed: 12/17/2022]
Abstract
BMPs (Bone morphogenetic proteins) such as BMP2 and BMP7 have been used about one decade as bone anabolic agents in orthopaedics. The BMP receptor ACVR1, which is a key receptor of BMP7, is expressed in bone. The pathological role of ACVR1 in humans has been reported: a point mutation in ACVR1 can cause fibrodysplasia ossificans progressiva (FOP) in which ectopic ossification occurs in skeletal muscles and deep connective tissues. The physiological function of ACVR1 in bone, however, is totally unknown. The purpose of this study is to investigate the endogenous role of ACVR1 in osteoblasts, one of the most dominant cell-types in bone. We generated Acvr1-null mice in an osteoblast-specific manner using an inducible Cre-loxP system. Surprisingly, we found that bone mass was increased in the Acvr1-null mice. Interestingly, canonical Wnt signaling was increased and expression levels of Wnt inhibitors Sost and Dkk1 were both suppressed in the null bones during the developmental stages. In addition, we confirmed that expression levels of both Sost and Dkk1 were upregulated by BMP7 dose-dependently in vitro. These results suggest that the Acvr1-deficiency can increase bone mass by activating Wnt signaling in which both Sost and Dkk1 expression levels are diminished. This study leads to a new concept of the BMP7-ACVR1-SOST/DKK1 axis in osteoblasts, in which BMP7 signaling through ACVR1 can reduce Wnt signaling via SOST/DKK1 and then inhibits osteogenesis. Although this concept is beyond the current known function of BMP7, it can explain the varied outcomes of BMP7 treatment. We believe BMP signaling can exhibit multifaceted effects by context and cell type.
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Affiliation(s)
- Nobuhiro Kamiya
- Center for Excellence in Hip Disorders, Texas Scottish Rite Hospital for Children, Dallas, TX 75219, USA.
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Perturbation of hepcidin expression by BMP type I receptor deletion induces iron overload in mice. Blood 2011; 118:4224-30. [PMID: 21841161 DOI: 10.1182/blood-2011-03-339952] [Citation(s) in RCA: 146] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Bone morphogenetic protein (BMP) signaling induces hepatic expression of the peptide hormone hepcidin. Hepcidin reduces serum iron levels by promoting degradation of the iron exporter ferroportin. A relative deficiency of hepcidin underlies the pathophysiology of many of the genetically distinct iron overload disorders, collectively termed hereditary hemochromatosis. Conversely, chronic inflammatory conditions and neoplastic diseases can induce high hepcidin levels, leading to impaired mobilization of iron stores and the anemia of chronic disease. Two BMP type I receptors, Alk2 (Acvr1) and Alk3 (Bmpr1a), are expressed in murine hepatocytes. We report that liver-specific deletion of either Alk2 or Alk3 causes iron overload in mice. The iron overload phenotype was more marked in Alk3- than in Alk2-deficient mice, and Alk3 deficiency was associated with a nearly complete ablation of basal BMP signaling and hepcidin expression. Both Alk2 and Alk3 were required for induction of hepcidin gene expression by BMP2 in cultured hepatocytes or by iron challenge in vivo. These observations demonstrate that one type I BMP receptor, Alk3, is critically responsible for basal hepcidin expression, whereas 2 type I BMP receptors, Alk2 and Alk3, are required for regulation of hepcidin gene expression in response to iron and BMP signaling.
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Komatsu Y, Kaartinen V, Mishina Y. Cell cycle arrest in node cells governs ciliogenesis at the node to break left-right symmetry. Development 2011; 138:3915-20. [PMID: 21831921 DOI: 10.1242/dev.068833] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Cilia at the node generate a leftward fluid flow that breaks left-right symmetry. However, the molecular mechanisms that regulate ciliogenesis at the node are largely unknown. Here, we show that the epiblast-specific deletion of the gene encoding the BMP type 1 receptor (Acvr1) compromised development of nodal cilia, which results in defects in leftward fluid flow and, thus, abnormalities in left-right patterning. Acvr1 deficiency in mouse embryonic fibroblasts (MEFs) resulted in severe defects in their quiescence-induced primary cilia. Although the induction of quiescence in wild-type MEFs leads to an increase in the level of the cyclin-dependent kinase inhibitor p27(Kip1) and to rapid p27(Kip1) phosphorylation on Ser(10), MEFs deficient in Acvr1 show a reduction in both p27(Kip1) protein levels and in p27(Kip1) Ser(10) phosphorylation. The observed defects in cilium development were rescued by the introduction of p27(Kip1) into Acvr1-deficient MEFs, implying that BMP signaling positively controls p27(Kip1) stability in the G0 phase via p27(Kip1) Ser(10) phosphorylation, which is a prerequisite for induction of primary cilia. Importantly, in control embryos, p27(Kip1) protein is clearly present and strongly phosphorylated on Ser(10) in cells on the quiescent ventral surface of the node. By contrast, the corresponding cells in the node of Acvr1 mutant embryos were proliferative and showed a dramatic attenuation in both p27(Kip1) protein levels and phosphorylation on Ser(10). Our data suggest that cell quiescence controlled by BMP signaling via ACVR1 is required for transient formation of nodal cilia, and provide insight into the fundamental question of how the node represents the mechanistic `node' that regulates the development of left-right symmetry in vertebrates.
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Affiliation(s)
- Yoshihiro Komatsu
- Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan, 1011 North University Avenue, Ann Arbor, MI 48109-1078, USA
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Leikauf GD, Concel VJ, Liu P, Bein K, Berndt A, Ganguly K, Jang AS, Brant KA, Dietsch M, Pope-Varsalona H, Dopico RA, Di YPP, Li Q, Vuga LJ, Medvedovic M, Kaminski N, You M, Prows DR. Haplotype association mapping of acute lung injury in mice implicates activin a receptor, type 1. Am J Respir Crit Care Med 2011; 183:1499-509. [PMID: 21297076 PMCID: PMC3137140 DOI: 10.1164/rccm.201006-0912oc] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2010] [Accepted: 02/04/2011] [Indexed: 01/11/2023] Open
Abstract
RATIONALE Because acute lung injury is a sporadic disease produced by heterogeneous precipitating factors, previous genetic analyses are mainly limited to candidate gene case-control studies. OBJECTIVES To develop a genome-wide strategy in which single nucleotide polymorphism associations are assessed for functional consequences to survival during acute lung injury in mice. METHODS To identify genes associated with acute lung injury, 40 inbred strains were exposed to acrolein and haplotype association mapping, microarray, and DNA-protein binding were assessed. MEASUREMENTS AND MAIN RESULTS The mean survival time varied among mouse strains with polar strains differing approximately 2.5-fold. Associations were identified on chromosomes 1, 2, 4, 11, and 12. Seven genes (Acvr1, Cacnb4, Ccdc148, Galnt13, Rfwd2, Rpap2, and Tgfbr3) had single nucleotide polymorphism (SNP) associations within the gene. Because SNP associations may encompass "blocks" of associated variants, functional assessment was performed in 91 genes within ± 1 Mbp of each SNP association. Using 10% or greater allelic frequency and 10% or greater phenotype explained as threshold criteria, 16 genes were assessed by microarray and reverse real-time polymerase chain reaction. Microarray revealed several enriched pathways including transforming growth factor-β signaling. Transcripts for Acvr1, Arhgap15, Cacybp, Rfwd2, and Tgfbr3 differed between the strains with exposure and contained SNPs that could eliminate putative transcriptional factor recognition sites. Ccdc148, Fancl, and Tnn had sequence differences that could produce an amino acid substitution. Mycn and Mgat4a had a promoter SNP or 3'untranslated region SNPs, respectively. Several genes were related and encoded receptors (ACVR1, TGFBR3), transcription factors (MYCN, possibly CCDC148), and ubiquitin-proteasome (RFWD2, FANCL, CACYBP) proteins that can modulate cell signaling. An Acvr1 SNP eliminated a putative ELK1 binding site and diminished DNA-protein binding. CONCLUSIONS Assessment of genetic associations can be strengthened using a genetic/genomic approach. This approach identified several candidate genes, including Acvr1, associated with increased susceptibility to acute lung injury in mice.
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Affiliation(s)
- George D Leikauf
- Department of Environmental and Occupational Health, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA 15219-3130, USA.
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Distinct signalling pathways regulate sprouting angiogenesis from the dorsal aorta and the axial vein. Nat Cell Biol 2011; 13:686-92. [PMID: 21572418 PMCID: PMC3107371 DOI: 10.1038/ncb2232] [Citation(s) in RCA: 153] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2010] [Accepted: 03/08/2011] [Indexed: 12/13/2022]
Abstract
Angiogenesis, the formation of new blood vessels from pre-existing vessels, is critical to most physiological processes and many pathological conditions. During zebrafish development, angiogenesis expands the axial vessels into a complex vascular network that is necessary for efficient oxygen delivery. Although the dorsal aorta and the axial vein are spatially juxtaposed, the initial angiogenic sprouts from these vessels extend in opposite directions, indicating that distinct cues may regulate angiogenesis of the axial vessels. We found that angiogenic sprouts from the dorsal aorta are dependent on vascular endothelial growth factor A (Vegf-A) signalling, and do not respond to bone morphogenetic protein (Bmp) signals. In contrast, sprouts from the axial vein are regulated by Bmp signalling independently of Vegf-A signals, indicating that Bmp is a vein-specific angiogenic cue during early vascular development. Our results support a paradigm whereby different signals regulate distinct programmes of sprouting angiogenesis from the axial vein and dorsal aorta, and indicate that signalling heterogeneity contributes to the complexity of vascular networks.
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