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Raman R, Antony M, Nivelle R, Lavergne A, Zappia J, Guerrero-Limón G, Caetano da Silva C, Kumari P, Sojan JM, Degueldre C, Bahri MA, Ostertag A, Collet C, Cohen-Solal M, Plenevaux A, Henrotin Y, Renn J, Muller M. The Osteoblast Transcriptome in Developing Zebrafish Reveals Key Roles for Extracellular Matrix Proteins Col10a1a and Fbln1 in Skeletal Development and Homeostasis. Biomolecules 2024; 14:139. [PMID: 38397376 PMCID: PMC10886564 DOI: 10.3390/biom14020139] [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: 11/10/2023] [Revised: 01/05/2024] [Accepted: 01/11/2024] [Indexed: 02/25/2024] Open
Abstract
Zebrafish are now widely used to study skeletal development and bone-related diseases. To that end, understanding osteoblast differentiation and function, the expression of essential transcription factors, signaling molecules, and extracellular matrix proteins is crucial. We isolated Sp7-expressing osteoblasts from 4-day-old larvae using a fluorescent reporter. We identified two distinct subpopulations and characterized their specific transcriptome as well as their structural, regulatory, and signaling profile. Based on their differential expression in these subpopulations, we generated mutants for the extracellular matrix protein genes col10a1a and fbln1 to study their functions. The col10a1a-/- mutant larvae display reduced chondrocranium size and decreased bone mineralization, while in adults a reduced vertebral thickness and tissue mineral density, and fusion of the caudal fin vertebrae were observed. In contrast, fbln1-/- mutants showed an increased mineralization of cranial elements and a reduced ceratohyal angle in larvae, while in adults a significantly increased vertebral centra thickness, length, volume, surface area, and tissue mineral density was observed. In addition, absence of the opercle specifically on the right side was observed. Transcriptomic analysis reveals up-regulation of genes involved in collagen biosynthesis and down-regulation of Fgf8 signaling in fbln1-/- mutants. Taken together, our results highlight the importance of bone extracellular matrix protein genes col10a1a and fbln1 in skeletal development and homeostasis.
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Affiliation(s)
- Ratish Raman
- Laboratory for Organogenesis and Regeneration (LOR), GIGA Institute, University of Liège, 4000 Liège, Belgium; (R.R.); (M.A.); (R.N.); (G.G.-L.); (J.R.)
| | - Mishal Antony
- Laboratory for Organogenesis and Regeneration (LOR), GIGA Institute, University of Liège, 4000 Liège, Belgium; (R.R.); (M.A.); (R.N.); (G.G.-L.); (J.R.)
| | - Renaud Nivelle
- Laboratory for Organogenesis and Regeneration (LOR), GIGA Institute, University of Liège, 4000 Liège, Belgium; (R.R.); (M.A.); (R.N.); (G.G.-L.); (J.R.)
| | - Arnaud Lavergne
- GIGA Genomics Platform, B34, GIGA Institute, University of Liège, 4000 Liège, Belgium;
| | - Jérémie Zappia
- MusculoSKeletal Innovative Research Lab, Center for Interdisciplinary Research on Medicines, University of Liège, 4000 Liège, Belgium (Y.H.)
| | - Gustavo Guerrero-Limón
- Laboratory for Organogenesis and Regeneration (LOR), GIGA Institute, University of Liège, 4000 Liège, Belgium; (R.R.); (M.A.); (R.N.); (G.G.-L.); (J.R.)
| | - Caroline Caetano da Silva
- Hospital Lariboisière, Reference Centre for Rare Bone Diseases, INSERM U1132, Université de Paris-Cité, F-75010 Paris, France; (C.C.d.S.); (A.O.); (C.C.); (M.C.-S.)
| | - Priyanka Kumari
- Laboratory of Pharmaceutical and Analytical Chemistry, Department of Pharmacy, CIRM, Sart Tilman, 4000 Liège, Belgium;
| | - Jerry Maria Sojan
- Department of Life and Environmental Sciences, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy;
| | - Christian Degueldre
- GIGA CRC In Vivo Imaging, University of Liège, Sart Tilman, 4000 Liège, Belgium; (C.D.); (M.A.B.); (A.P.)
| | - Mohamed Ali Bahri
- GIGA CRC In Vivo Imaging, University of Liège, Sart Tilman, 4000 Liège, Belgium; (C.D.); (M.A.B.); (A.P.)
| | - Agnes Ostertag
- Hospital Lariboisière, Reference Centre for Rare Bone Diseases, INSERM U1132, Université de Paris-Cité, F-75010 Paris, France; (C.C.d.S.); (A.O.); (C.C.); (M.C.-S.)
| | - Corinne Collet
- Hospital Lariboisière, Reference Centre for Rare Bone Diseases, INSERM U1132, Université de Paris-Cité, F-75010 Paris, France; (C.C.d.S.); (A.O.); (C.C.); (M.C.-S.)
- UF de Génétique Moléculaire, Hôpital Robert Debré, APHP, F-75019 Paris, France
| | - Martine Cohen-Solal
- Hospital Lariboisière, Reference Centre for Rare Bone Diseases, INSERM U1132, Université de Paris-Cité, F-75010 Paris, France; (C.C.d.S.); (A.O.); (C.C.); (M.C.-S.)
| | - Alain Plenevaux
- GIGA CRC In Vivo Imaging, University of Liège, Sart Tilman, 4000 Liège, Belgium; (C.D.); (M.A.B.); (A.P.)
| | - Yves Henrotin
- MusculoSKeletal Innovative Research Lab, Center for Interdisciplinary Research on Medicines, University of Liège, 4000 Liège, Belgium (Y.H.)
| | - Jörg Renn
- Laboratory for Organogenesis and Regeneration (LOR), GIGA Institute, University of Liège, 4000 Liège, Belgium; (R.R.); (M.A.); (R.N.); (G.G.-L.); (J.R.)
| | - Marc Muller
- Laboratory for Organogenesis and Regeneration (LOR), GIGA Institute, University of Liège, 4000 Liège, Belgium; (R.R.); (M.A.); (R.N.); (G.G.-L.); (J.R.)
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Wang X, Hivert V, Groot S, Wang Y, Yengo L, McGrath JJ, Kemper KE, Visscher PM, Wray NR, Revez JA. Cross-ancestry analyses identify new genetic loci associated with 25-hydroxyvitamin D. PLoS Genet 2023; 19:e1011033. [PMID: 37963177 PMCID: PMC10684098 DOI: 10.1371/journal.pgen.1011033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 11/28/2023] [Accepted: 10/24/2023] [Indexed: 11/16/2023] Open
Abstract
Vitamin D status-a complex trait influenced by environmental and genetic factors-is tightly associated with skin colour and ancestry. Yet very few studies have investigated the genetic underpinnings of vitamin D levels across diverse ancestries, and the ones that have, relied on small sample sizes, resulting in inconclusive results. Here, we conduct genome-wide association studies (GWAS) of 25 hydroxyvitamin D (25OHD)-the main circulating form of vitamin D-in 442,435 individuals from four broad genetically-determined ancestry groups represented in the UK Biobank: European (N = 421,867), South Asian (N = 9,983), African (N = 8,306) and East Asian (N = 2,279). We identify a new genetic determinant of 25OHD (rs146759773) in individuals of African ancestry, which was not detected in previous analysis of much larger European cohorts due to low minor allele frequency. We show genome-wide significant evidence of dominance effects in 25OHD that protect against vitamin D deficiency. Given that key events in the synthesis of 25OHD occur in the skin and are affected by pigmentation levels, we conduct GWAS of 25OHD stratified by skin colour and identify new associations. Lastly, we test the interaction between skin colour and variants associated with variance in 25OHD levels and identify two loci (rs10832254 and rs1352846) whose association with 25OHD differs in individuals of distinct complexions. Collectively, our results provide new insights into the complex relationship between 25OHD and skin colour and highlight the importance of diversity in genomic studies. Despite the much larger rates of vitamin D deficiency that we and others report for ancestry groups with dark skin (e.g., South Asian), our study highlights the importance of considering ancestral background and/or skin colour when assessing the implications of low vitamin D.
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Affiliation(s)
- Xiaotong Wang
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Valentin Hivert
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Shiane Groot
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Ying Wang
- Analytic and Translational Genetics Unit, Massachusetts General Hospital, Boston, Massachusetts, United States of America
- Stanley Center for Psychiatric Research and Program in Medical and Population Genetics, Broad Institute of Harvard and MIT, Cambridge, Massachusetts, United States of America
| | - Loic Yengo
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - John J. McGrath
- National Centre for Register-Based Research, Aarhus University, Aarhus V, Denmark
- Queensland Centre for Mental Health Research, The Park Centre for Mental Health, Brisbane, Queensland, Australia
- Queensland Brain Institute, The University of Queensland, Brisbane, Queensland, Australia
| | - Kathryn E. Kemper
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Peter M. Visscher
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Naomi R. Wray
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
- Queensland Brain Institute, The University of Queensland, Brisbane, Queensland, Australia
| | - Joana A. Revez
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
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Atkinson EG, Adaway M, Horan DJ, Korff C, Klunk A, Orr AL, Ratz K, Bellido T, Plotkin LI, Robling AG, Bidwell JP. Conditional Loss of Nmp4 in Mesenchymal Stem Progenitor Cells Enhances PTH-Induced Bone Formation. J Bone Miner Res 2023; 38:70-85. [PMID: 36321253 PMCID: PMC9825665 DOI: 10.1002/jbmr.4732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 10/12/2022] [Accepted: 10/29/2022] [Indexed: 11/24/2022]
Abstract
Activation of bone anabolic pathways is a fruitful approach for treating severe osteoporosis, yet FDA-approved osteoanabolics, eg, parathyroid hormone (PTH), have limited efficacy. Improving their potency is a promising strategy for maximizing bone anabolic output. Nmp4 (Nuclear Matrix Protein 4) global knockout mice exhibit enhanced PTH-induced increases in trabecular bone but display no overt baseline skeletal phenotype. Nmp4 is expressed in all tissues; therefore, to determine which cell type is responsible for driving the beneficial effects of Nmp4 inhibition, we conditionally removed this gene from cells at distinct stages of osteogenic differentiation. Nmp4-floxed (Nmp4fl/fl ) mice were crossed with mice bearing one of three Cre drivers including (i) Prx1Cre+ to remove Nmp4 from mesenchymal stem/progenitor cells (MSPCs) in long bones; (ii) BglapCre+ targeting mature osteoblasts, and (iii) Dmp1Cre+ to disable Nmp4 in osteocytes. Virgin female Cre+ and Cre- mice (10 weeks of age) were sorted into cohorts by weight and genotype. Mice were administered daily injections of either human PTH 1-34 at 30 μg/kg or vehicle for 4 weeks or 7 weeks. Skeletal response was assessed using dual-energy X-ray absorptiometry, micro-computed tomography, bone histomorphometry, and serum analysis for remodeling markers. Nmp4fl/fl ;Prx1Cre+ mice virtually phenocopied the global Nmp4-/- skeleton in the femur, ie, a mild baseline phenotype but significantly enhanced PTH-induced increase in femur trabecular bone volume/total volume (BV/TV) compared with their Nmp4fl/fl ;Prx1Cre- controls. This was not observed in the spine, where Prrx1 is not expressed. Heightened response to PTH was coincident with enhanced bone formation. Conditional loss of Nmp4 from the mature osteoblasts (Nmp4fl/fl ;BglapCre+ ) failed to increase BV/TV or enhance PTH response. However, conditional disabling of Nmp4 in osteocytes (Nmp4fl/fl ;Dmp1Cre+ ) increased BV/TV without boosting response to hormone under our experimental regimen. We conclude that Nmp4-/- Prx1-expressing MSPCs drive the improved response to PTH therapy and that this gene has stage-specific effects on osteoanabolism. © 2022 American Society for Bone and Mineral Research (ASBMR).
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Affiliation(s)
- Emily G. Atkinson
- Department of Anatomy, Cell Biology, & Physiology, Indiana University School of Medicine (IUSM), Indianapolis, IN 46202
| | - Michele Adaway
- Department of Anatomy, Cell Biology, & Physiology, Indiana University School of Medicine (IUSM), Indianapolis, IN 46202
| | - Daniel J. Horan
- Department of Anatomy, Cell Biology, & Physiology, Indiana University School of Medicine (IUSM), Indianapolis, IN 46202
- Richard L. Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana, USA
| | | | - Angela Klunk
- Department of Anatomy, Cell Biology, & Physiology, Indiana University School of Medicine (IUSM), Indianapolis, IN 46202
| | - Ashley L. Orr
- Department of Anatomy, Cell Biology, & Physiology, Indiana University School of Medicine (IUSM), Indianapolis, IN 46202
- Present Address: Division of Biomedical Sciences, College of Osteopathic Medicine, Marian University Indianapolis, IN 46222
| | - Katherine Ratz
- Department of Anatomy, Cell Biology, & Physiology, Indiana University School of Medicine (IUSM), Indianapolis, IN 46202
- Present Address: Division of Biomedical Sciences, College of Osteopathic Medicine, Marian University Indianapolis, IN 46222
| | - Teresita Bellido
- Department of Physiology and Cell Biology University of Arkansas for Medical Sciences (UAMS), Little Rock, AR 72205
- Central Arkansas Veterans Healthcare System, Little Rock, AR 72205
| | - Lilian I. Plotkin
- Department of Anatomy, Cell Biology, & Physiology, Indiana University School of Medicine (IUSM), Indianapolis, IN 46202
- Indiana Center for Musculoskeletal Health, IUSM
| | - Alexander G. Robling
- Department of Anatomy, Cell Biology, & Physiology, Indiana University School of Medicine (IUSM), Indianapolis, IN 46202
- Richard L. Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana, USA
- Indiana Center for Musculoskeletal Health, IUSM
| | - Joseph P. Bidwell
- Department of Anatomy, Cell Biology, & Physiology, Indiana University School of Medicine (IUSM), Indianapolis, IN 46202
- Indiana Center for Musculoskeletal Health, IUSM
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Dong Z, Coates D, Liu Q, Sun H, Li C. Quantitative proteomic analysis of deer antler stem cells as a model of mammalian organ regeneration. J Proteomics 2019; 195:98-113. [DOI: 10.1016/j.jprot.2019.01.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 12/25/2018] [Accepted: 01/07/2019] [Indexed: 12/18/2022]
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Jiang K, Huang D, Zhang D, Wang X, Cao H, Zhang Q, Yan C. Investigation of inulins from the roots of Morinda officinalis for potential therapeutic application as anti-osteoporosis agent. Int J Biol Macromol 2018; 120:170-179. [PMID: 30125630 DOI: 10.1016/j.ijbiomac.2018.08.082] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 08/13/2018] [Accepted: 08/14/2018] [Indexed: 01/06/2023]
Abstract
SCOPE In China, the root of M. officinalis has been widely used over thousands of years against a wide range of bone disease such as lumbago, limb-ache, sciatica and rheumatic arthralgia, and has tremendous medicinal value. But the bioactive constituents responsible for the osteoprotective effects in M. officinalis remain unknown. METHODS AND RESULTS M. officinalis polysaccharides were extracted, isolated and purified via DEAE-cellulose 52 and Sephacryl S-100HR column to obtain two saccharides (MOP70-1 and MOP70-2). The results of osteogenic activity assays revealed that MOP70-1 and MOP70-2 significantly promoted the proliferation, differentiation and mineralization of MC3T3-E1 cells. Furthermore, MOP70-2 also upregulated gene expression of runt-related transcription factor 2, osterix, osteocalcin, osteopontin, bone sialoprotein and osteoprotegerin, which implied that MOP70-2 stimulated osteoblastic differentiation by up-regulating osteogenic differentiation-related marker genes. In addition, structural analysis indicated that MOP70-2 contained (2 → 1)-linked-β-D-Fruf residues and terminated with a glucose residue. Morphological and conformational analyses indicated that MOP70-2 exhibited spherical structure of conglomeration and had no triple helix structure. CONCLUSION Our studies reported the osteogenic inulins obtained from root of M. officinalis for the first time. The systematical investigation including extraction, purification, biological activities and structural characterization provide a strong evidence for future therapeutic applications as anti-osteoporosis agent.
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Affiliation(s)
- Keming Jiang
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, China
| | - Dong Huang
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, China
| | - Dawei Zhang
- Department of Pharmacology, Guangdong Medical University, Dongguan, Guangdong 523808, China
| | - Xinluan Wang
- Translational Medicine R&D Center, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Huijuan Cao
- Translational Medicine R&D Center, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Qian Zhang
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, China
| | - Chunyan Yan
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, China.
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Shao Y, Hernandez-Buquer S, Childress P, Stayrook KR, Alvarez MB, Davis H, Plotkin LI, He Y, Condon KW, Burr DB, Warden SJ, Robling AG, Yang FC, Wek RC, Allen MR, Bidwell JP. Improving Combination Osteoporosis Therapy in a Preclinical Model of Heightened Osteoanabolism. Endocrinology 2017; 158. [PMID: 28637206 PMCID: PMC5659666 DOI: 10.1210/en.2017-00355] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Combining anticatabolic agents with parathyroid hormone (PTH) to enhance bone mass has yielded mixed results in osteoporosis patients. Toward the goal of enhancing the efficacy of these regimens, we tested their utility in combination with loss of the transcription factor Nmp4 because disabling this gene amplifies PTH-induced increases in trabecular bone in mice by boosting osteoblast secretory activity. We addressed whether combining a sustained anabolic response with an anticatabolic results in superior bone acquisition compared with PTH monotherapy. Additionally, we inquired whether Nmp4 interferes with anticatabolic efficacy. Wild-type and Nmp4-/- mice were ovariectomized at 12 weeks of age, followed by therapy regimens, administered from 16 to 24 weeks, and included individually or combined PTH, alendronate (ALN), zoledronate (ZOL), and raloxifene (RAL). Anabolic therapeutic efficacy generally corresponded with PTH + RAL = PTH + ZOL > PTH + ALN = PTH > vehicle control. Loss of Nmp4 enhanced femoral trabecular bone increases under PTH + RAL and PTH + ZOL. RAL and ZOL promoted bone restoration, but unexpectedly, loss of Nmp4 boosted RAL-induced increases in femoral trabecular bone. The combination of PTH, RAL, and loss of Nmp4 significantly increased bone marrow osteoprogenitor number, but did not affect adipogenesis or osteoclastogenesis. RAL, but not ZOL, increased osteoprogenitors in both genotypes. Nmp4 status did not influence bone serum marker responses to treatments, but Nmp4-/- mice as a group showed elevated levels of the bone formation marker osteocalcin. We conclude that the heightened osteoanabolism of the Nmp4-/- skeleton enhances the effectiveness of diverse osteoporosis treatments, in part by increasing hyperanabolic osteoprogenitors. Nmp4 provides a promising target pathway for identifying barriers to pharmacologically induced bone formation.
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Affiliation(s)
- Yu Shao
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Selene Hernandez-Buquer
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Paul Childress
- Department of Orthopedic Surgery, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Keith R. Stayrook
- Department of Pharmacology and Toxicology, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Marta B. Alvarez
- Department of Orthopedic Surgery, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Hannah Davis
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Lilian I. Plotkin
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Yongzheng He
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana 46202
- Herman B. Wells Center for Pediatric Research, Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Keith W. Condon
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - David B. Burr
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Stuart J. Warden
- Center for Translational Musculoskeletal Research, School of Health and Rehabilitation Sciences, Indiana University, Indianapolis, Indiana 46202
- Department of Physical Therapy, School of Health and Rehabilitation Sciences, Indiana University, Indianapolis, Indiana 46202
| | - Alexander G. Robling
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Feng-Chun Yang
- Department of Biochemistry and Molecular Biology, Miller School of Medicine, University of Miami, Miami, Florida 33136
| | - Ronald C. Wek
- Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Matthew R. Allen
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana 46202
- Richard A. Roudebush Veterans Administration Medical Center, Indianapolis, Indiana 46202
| | - Joseph P. Bidwell
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana 46202
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana 46202
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Wang L, Roth T, Abbott M, Ho L, Wattanachanya L, Nissenson RA. Osteoblast-derived FGF9 regulates skeletal homeostasis. Bone 2017; 98:18-25. [PMID: 28189801 PMCID: PMC8474898 DOI: 10.1016/j.bone.2016.12.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 12/01/2016] [Accepted: 12/10/2016] [Indexed: 11/21/2022]
Abstract
FGF9 has complex and important roles in skeletal development and repair. We have previously observed that Fgf9 expression in osteoblasts (OBs) is regulated by G protein signaling and therefore the present study was done to determine whether OB-derived FGF9 was important in skeletal homeostasis. To directly test this idea, we deleted functional expression of Fgf9 gene in OBs using a 2.3kb collagen type I promoter-driven Cre transgenic mouse line (Fgf9OB-/-). Both Fgf9 knockout (Fgf9OB-/-) and the Fgf9 floxed littermates (Fgf9fl/fl) mice were fully backcrossed and maintained in an FBV/N background. Three month old Fgf9OB-/- mice displayed a significant decrease in cancellous bone and bone formation in the distal femur and a significant decrease in cortical thickness at the TFJ. Strikingly, female Fgf9OB-/- mice did not display altered bone mass. Continuous treatment of mouse BMSCs with exogenous FGF9 inhibited mouse BMSC mineralization while acute treatment increased the proliferation of progenitors, an effect requiring the activation of Akt1. Our results suggest that mature OBs are an important source of FGF9, positively regulating skeletal homeostasis in male mice. Osteoblast-derived FGF9 may serve a paracrine role to maintain the osteogenic progenitor cell population through activation of Akt signaling.
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Affiliation(s)
- Liping Wang
- Endocrine Unit, VA Medical Center, San Francisco, CA, USA; Department of Medicine, University of California, San Francisco, CA, USA
| | - Theresa Roth
- Endocrine Unit, VA Medical Center, San Francisco, CA, USA
| | - Marcia Abbott
- Endocrine Unit, VA Medical Center, San Francisco, CA, USA
| | - Linh Ho
- Endocrine Unit, VA Medical Center, San Francisco, CA, USA
| | - Lalita Wattanachanya
- Endocrine Unit, VA Medical Center, San Francisco, CA, USA; Division of Endocrinology and Metabolism, Department of Medicine, Faculty of Medicine, Chulalongkorn University, Thai Red Cross Society, Bangkok, Thailand; King Chulalongkorn Memorial Hospital, Bangkok, Thailand
| | - Robert A Nissenson
- Endocrine Unit, VA Medical Center, San Francisco, CA, USA; Department of Medicine, University of California, San Francisco, CA, USA.
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