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Andrews RE, Brown JE, Lawson MA, Chantry AD. Myeloma Bone Disease: The Osteoblast in the Spotlight. J Clin Med 2021; 10:jcm10173973. [PMID: 34501423 PMCID: PMC8432062 DOI: 10.3390/jcm10173973] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 08/24/2021] [Accepted: 08/27/2021] [Indexed: 12/17/2022] Open
Abstract
Lytic bone disease remains a life-altering complication of multiple myeloma, with up to 90% of sufferers experiencing skeletal events at some point in their cancer journey. This tumour-induced bone disease is driven by an upregulation of bone resorption (via increased osteoclast (OC) activity) and a downregulation of bone formation (via reduced osteoblast (OB) activity), leading to phenotypic osteolysis. Treatments are limited, and currently exclusively target OCs. Despite existing bone targeting therapies, patients successfully achieving remission from their cancer can still be left with chronic pain, poor mobility, and reduced quality of life as a result of bone disease. As such, the field is desperately in need of new and improved bone-modulating therapeutic agents. One such option is the use of bone anabolics, drugs that are gaining traction in the osteoporosis field following successful clinical trials. The prospect of using these therapies in relation to myeloma is an attractive option, as they aim to stimulate OBs, as opposed to existing therapeutics that do little to orchestrate new bone formation. The preclinical application of bone anabolics in myeloma mouse models has demonstrated positive outcomes for bone repair and fracture resistance. Here, we review the role of the OB in the pathophysiology of myeloma-induced bone disease and explore whether novel OB targeted therapies could improve outcomes for patients.
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Affiliation(s)
- Rebecca E. Andrews
- Department of Oncology and Metabolism, The Medical School, The University of Sheffield, Sheffield S10 2RX, UK; (J.E.B.); (M.A.L.); (A.D.C.)
- Department of Haematology, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield S10 2JF, UK
- Correspondence:
| | - Janet E. Brown
- Department of Oncology and Metabolism, The Medical School, The University of Sheffield, Sheffield S10 2RX, UK; (J.E.B.); (M.A.L.); (A.D.C.)
- Department of Haematology, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield S10 2JF, UK
| | - Michelle A. Lawson
- Department of Oncology and Metabolism, The Medical School, The University of Sheffield, Sheffield S10 2RX, UK; (J.E.B.); (M.A.L.); (A.D.C.)
| | - Andrew D. Chantry
- Department of Oncology and Metabolism, The Medical School, The University of Sheffield, Sheffield S10 2RX, UK; (J.E.B.); (M.A.L.); (A.D.C.)
- Department of Haematology, Sheffield Teaching Hospitals NHS Foundation Trust, Royal Hallamshire Hospital, Sheffield S10 2JF, UK
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Martinez-Hackert E, Sundan A, Holien T. Receptor binding competition: A paradigm for regulating TGF-β family action. Cytokine Growth Factor Rev 2020; 57:39-54. [PMID: 33087301 DOI: 10.1016/j.cytogfr.2020.09.003] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 09/23/2020] [Indexed: 02/06/2023]
Abstract
The transforming growth factor (TGF)-β family is a group of structurally related, multifunctional growth factors, or ligands that are crucially involved in the development, regulation, and maintenance of animal tissues. In humans, the family counts over 33 members. These secreted ligands typically form multimeric complexes with two type I and two type II receptors to activate one of two distinct signal transduction branches. A striking feature of the family is its promiscuity, i.e., many ligands bind the same receptors and compete with each other for binding to these receptors. Although several explanations for this feature have been considered, its functional significance has remained puzzling. However, several recent reports have promoted the idea that ligand-receptor binding promiscuity and competition are critical features of the TGF-β family that provide an essential regulating function. Namely, they allow a cell to read and process multi-ligand inputs. This capability may be necessary for producing subtle, distinctive, or adaptive responses and, possibly, for facilitating developmental plasticity. Here, we review the molecular basis for ligand competition, with emphasis on molecular structures and binding affinities. We give an overview of methods that were used to establish experimentally ligand competition. Finally, we discuss how the concept of ligand competition may be fundamentally tied to human physiology, disease, and therapy.
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Affiliation(s)
- Erik Martinez-Hackert
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, 48824, USA.
| | - Anders Sundan
- Department of Clinical and Molecular Medicine, NTNU - Norwegian University of Science and Technology, 7491, Trondheim, Norway; Centre of Molecular Inflammation Research (CEMIR), Norwegian University of Science and Technology, 7491, Trondheim, Norway
| | - Toril Holien
- Department of Clinical and Molecular Medicine, NTNU - Norwegian University of Science and Technology, 7491, Trondheim, Norway; Department of Hematology, St. Olav's University Hospital, 7030, Trondheim, Norway.
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Fan X, Xia H, Liu X, Li B, Fang J. Computational Design and Experimental Confirmation of a Head-to-Tail Cyclic Peptide to Target Human Bone Morphogenic Protein 2 based on its Type-IA Receptor. J Bioinform Comput Biol 2020. [DOI: 10.1142/s0219720020500213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Abstract
Bone Morphogenetic Proteins (BMPs) together with the Growth and Differentiation Factors (GDFs) form the largest subgroup of the Transforming Growth Factor (TGF)β family and represent secreted growth factors, which play an essential role in many aspects of cell communication in higher organisms. As morphogens they exert crucial functions during embryonal development, but are also involved in tissue homeostasis and regeneration in the adult organism. Their involvement in maintenance and repair processes of various tissues and organs made these growth factors highly interesting targets for novel pharmaceutical applications in regenerative medicine. A hallmark of the TGFβ protein family is that all of the more than 30 growth factors identified to date signal by binding and hetero-oligomerization of a very limited set of transmembrane serine-threonine kinase receptors, which can be classified into two subgroups termed type I and type II. Only seven type I and five type II receptors exist for all 30plus TGFβ members suggesting a pronounced ligand-receptor promiscuity. Indeed, many TGFβ ligands can bind the same type I or type II receptor and a particular receptor of either subtype can usually interact with and bind various TGFβ ligands. The possible consequence of this ligand-receptor promiscuity is further aggravated by the finding that canonical TGFβ signaling of all family members seemingly results in the activation of just two distinct signaling pathways, that is either SMAD2/3 or SMAD1/5/8 activation. While this would implicate that different ligands can assemble seemingly identical receptor complexes that activate just either one of two distinct pathways, in vitro and in vivo analyses show that the different TGFβ members exert quite distinct biological functions with high specificity. This discrepancy indicates that our current view of TGFβ signaling initiation just by hetero-oligomerization of two receptor subtypes and transduction via two main pathways in an on-off switch manner is too simplified. Hence, the signals generated by the various TGFβ members are either quantitatively interpreted using the subtle differences in their receptor-binding properties leading to ligand-specific modulation of the downstream signaling cascade or additional components participating in the signaling activation complex allow diversification of the encoded signal in a ligand-dependent manner at all cellular levels. In this review we focus on signal specification of TGFβ members, particularly of BMPs and GDFs addressing the role of binding affinities, specificities, and kinetics of individual ligand-receptor interactions for the assembly of specific receptor complexes with potentially distinct signaling properties.
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Fan X, Xia H, Liu X, Li B, Fang J. Rational design of type-IA receptor-derived cyclic peptides to target human bone morphogenic protein 2. J Biosci 2019; 44:130. [PMID: 31894111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Human bone morphogenetic protein 2 (BMP2) is a bone-growth regulatory factor involved in the formation of bone and cartilage, and has been recogn ized as an attractive therapeutic target for a variety of bone diseases and defects. Here, we report successful design of a head-to-tail cyclic peptide based on crystal structure to target BMP2. Computational alanine scanning identifies two hotspot regions at the crystal complex interface of BMP2 with its type-IA receptor; promising one is stripped from the interface to derive a linear self-inhibitory peptide RPS2[r78-94] that covers residues 78-94 of the receptor protein. Dynamics simulation and energetics analysis reveal that the peptide is highly flexible in isolated state and cannot spontaneously bind to BMP2. The RPS2[r78-94] peptide is further extended from its N- and C-termini until reaching two spatially vicinal residues 74 and 98 in the crystal structure of intact BMP2-receptor complex system, consequently resulting in a longer peptide RPS2[r74-98], which is then cyclized in a head-to-tail manner to obtain its cyclic counterpart cycRPS2[r74-98]. Computational analysis suggests that the cyclic peptide can well maintain in a conformation similar with its active conformation in complex crystal structure, exhibiting a smaller disorder and a larger potency than its linear counterpart. Further assays confirm that the two linear peptides RPS2[r78-94] and RPS2[r74-98]are nonbinders of BMP2, whereas, as designed, the cyclic peptide cycRPS2[r74-98] can bind to BMP2 with a moderate affinity. The cyclic peptide is expected as a lead molecular entity to develop new and potent peptide-based drugs for BMP2-targeted therapy.
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Affiliation(s)
- Xiaohua Fan
- Department of Joint and Trauma Surgery, Yidu Central Hospital, Weifang Medical University, Qingzhou 262500, China
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Rational design of type-IA receptor-derived cyclic peptides to target human bone morphogenic protein 2. J Biosci 2019. [DOI: 10.1007/s12038-019-9945-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Gooding S, Olechnowicz SWZ, Morris EV, Armitage AE, Arezes J, Frost J, Repapi E, Edwards JR, Ashley N, Waugh C, Gray N, Martinez-Hackert E, Lim PJ, Pasricha SR, Knowles H, Mead AJ, Ramasamy K, Drakesmith H, Edwards CM. Transcriptomic profiling of the myeloma bone-lining niche reveals BMP signalling inhibition to improve bone disease. Nat Commun 2019; 10:4533. [PMID: 31586071 PMCID: PMC6778199 DOI: 10.1038/s41467-019-12296-1] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Accepted: 08/30/2019] [Indexed: 12/28/2022] Open
Abstract
Multiple myeloma is an incurable, bone marrow-dwelling malignancy that disrupts bone homeostasis causing skeletal damage and pain. Mechanisms underlying myeloma-induced bone destruction are poorly understood and current therapies do not restore lost bone mass. Using transcriptomic profiling of isolated bone lining cell subtypes from a murine myeloma model, we find that bone morphogenetic protein (BMP) signalling is upregulated in stromal progenitor cells. BMP signalling has not previously been reported to be dysregulated in myeloma bone disease. Inhibition of BMP signalling in vivo using either a small molecule BMP receptor antagonist or a solubilized BMPR1a-FC receptor ligand trap prevents trabecular and cortical bone volume loss caused by myeloma, without increasing tumour burden. BMP inhibition directly reduces osteoclastogenesis, increases osteoblasts and bone formation, and suppresses bone marrow sclerostin levels. In summary we describe a novel role for the BMP pathway in myeloma-induced bone disease that can be therapeutically targeted.
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Affiliation(s)
- Sarah Gooding
- MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
- Oxford University Hospitals NHS Trust, Oxford, UK
- NIHR Oxford Biomedical Research Centre Blood Theme, University of Oxford, Oxford, UK
- Oxford Centre for Translational Myeloma Research, University of Oxford, Oxford, UK
| | - Sam W Z Olechnowicz
- Oxford Centre for Translational Myeloma Research, University of Oxford, Oxford, UK
- Nuffield Dept. of Surgical Sciences, University of Oxford, Oxford, UK
| | - Emma V Morris
- Oxford Centre for Translational Myeloma Research, University of Oxford, Oxford, UK
- Nuffield Dept. of Surgical Sciences, University of Oxford, Oxford, UK
| | - Andrew E Armitage
- MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Joao Arezes
- MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Joe Frost
- MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Emmanouela Repapi
- MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - James R Edwards
- Oxford Centre for Translational Myeloma Research, University of Oxford, Oxford, UK
- Nuffield Dept. of Orthopaedics, Rheumatology and Musculoskeletal Sciences, Botnar Research Centre, University of Oxford, Oxford, UK
| | - Neil Ashley
- MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Craig Waugh
- MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Nicola Gray
- MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Erik Martinez-Hackert
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, 48824, USA
| | - Pei Jin Lim
- MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Sant-Rayn Pasricha
- MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
- MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Helen Knowles
- Nuffield Dept. of Orthopaedics, Rheumatology and Musculoskeletal Sciences, Botnar Research Centre, University of Oxford, Oxford, UK
| | - Adam J Mead
- Oxford University Hospitals NHS Trust, Oxford, UK
- NIHR Oxford Biomedical Research Centre Blood Theme, University of Oxford, Oxford, UK
- MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Karthik Ramasamy
- Oxford University Hospitals NHS Trust, Oxford, UK
- NIHR Oxford Biomedical Research Centre Blood Theme, University of Oxford, Oxford, UK
- Oxford Centre for Translational Myeloma Research, University of Oxford, Oxford, UK
- MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Hal Drakesmith
- MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK.
- NIHR Oxford Biomedical Research Centre Blood Theme, University of Oxford, Oxford, UK.
| | - Claire M Edwards
- NIHR Oxford Biomedical Research Centre Blood Theme, University of Oxford, Oxford, UK.
- Oxford Centre for Translational Myeloma Research, University of Oxford, Oxford, UK.
- Nuffield Dept. of Surgical Sciences, University of Oxford, Oxford, UK.
- Nuffield Dept. of Orthopaedics, Rheumatology and Musculoskeletal Sciences, Botnar Research Centre, University of Oxford, Oxford, UK.
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Olsen OE, Sankar M, Elsaadi S, Hella H, Buene G, Darvekar SR, Misund K, Katagiri T, Knaus P, Holien T. BMPR2 inhibits activin and BMP signaling via wild-type ALK2. J Cell Sci 2018; 131:jcs.213512. [PMID: 29739878 DOI: 10.1242/jcs.213512] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Accepted: 04/30/2018] [Indexed: 12/21/2022] Open
Abstract
TGF-β/BMP superfamily ligands require heteromeric complexes of type 1 and 2 receptors for ligand-dependent downstream signaling. Activin A, a TGF-β superfamily member, inhibits growth of multiple myeloma cells, but the mechanism for this is unknown. We therefore aimed to clarify how activins affect myeloma cell survival. Activin A activates the transcription factors SMAD2/3 through the ALK4 type 1 receptor, but may also activate SMAD1/5/8 through mutated variants of the type 1 receptor ALK2 (also known as ACVR1). We demonstrate that activin A and B activate SMAD1/5/8 in myeloma cells through endogenous wild-type ALK2. Knockdown of the type 2 receptor BMPR2 strongly potentiated activin A- and activin B-induced activation of SMAD1/5/8 and subsequent cell death. Furthermore, activity of BMP6, BMP7 or BMP9, which may also signal via ALK2, was potentiated by knockdown of BMPR2. Similar results were seen in HepG2 liver carcinoma cells. We propose that BMPR2 inhibits ALK2-mediated signaling by preventing ALK2 from oligomerizing with the type 2 receptors ACVR2A and ACVR2B, which are necessary for activation of ALK2 by activins and several BMPs. In conclusion, BMPR2 could be explored as a possible target for therapy in patients with multiple myeloma.This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
- Oddrun Elise Olsen
- Department of Clinical and Molecular Medicine, NTNU-Norwegian University of Science and Technology, 7491 Trondheim, Norway.,Department of Hematology, St. Olav's University Hospital, 7030 Trondheim, Norway
| | - Meenu Sankar
- School of Bioscience, University of Skövde, 541 28 Skövde, Sweden
| | - Samah Elsaadi
- Department of Clinical and Molecular Medicine, NTNU-Norwegian University of Science and Technology, 7491 Trondheim, Norway
| | - Hanne Hella
- Department of Clinical and Molecular Medicine, NTNU-Norwegian University of Science and Technology, 7491 Trondheim, Norway
| | - Glenn Buene
- Department of Clinical and Molecular Medicine, NTNU-Norwegian University of Science and Technology, 7491 Trondheim, Norway
| | - Sagar Ramesh Darvekar
- Department of Clinical and Molecular Medicine, NTNU-Norwegian University of Science and Technology, 7491 Trondheim, Norway
| | - Kristine Misund
- Department of Clinical and Molecular Medicine, NTNU-Norwegian University of Science and Technology, 7491 Trondheim, Norway.,Department of Hematology, St. Olav's University Hospital, 7030 Trondheim, Norway
| | - Takenobu Katagiri
- Division of Pathophysiology, Research Center for Genomic Medicine, Saitama Medical University, Hidaka-shi, Saitama 350-1241, Japan
| | - Petra Knaus
- Institute for Chemistry and Biochemistry, Freie Universitaet Berlin, 14195 Berlin, Germany
| | - Toril Holien
- Department of Clinical and Molecular Medicine, NTNU-Norwegian University of Science and Technology, 7491 Trondheim, Norway .,Department of Hematology, St. Olav's University Hospital, 7030 Trondheim, Norway
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