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Venkatesh VS, Nie T, Zajac JD, Grossmann M, Davey RA. The Utility of Preclinical Models in Understanding the Bone Health of Transgender Individuals Undergoing Gender-Affirming Hormone Therapy. Curr Osteoporos Rep 2023; 21:825-841. [PMID: 37707757 PMCID: PMC10724092 DOI: 10.1007/s11914-023-00818-2] [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] [Accepted: 08/16/2023] [Indexed: 09/15/2023]
Abstract
PURPOSE OF REVIEW To summarise the evidence regarding the effects of gender-affirming hormone therapy (GAHT) on bone health in transgender people, to identify key knowledge gaps and how these gaps can be addressed using preclinical rodent models. RECENT FINDINGS Sex hormones play a critical role in bone physiology, yet there is a paucity of research regarding the effects of GAHT on bone microstructure and fracture risk in transgender individuals. The controlled clinical studies required to yield fracture data are unethical to conduct making clinically translatable preclinical research of the utmost importance. Novel genetic and surgical preclinical models have yielded significant mechanistic insight into the roles of sex steroids on skeletal integrity. Preclinical models of GAHT have the potential inform clinical approaches to preserve skeletal integrity and prevent fractures in transgender people undergoing GAHT. This review highlights the key considerations required to ensure the information gained from preclinical models of GAHT are informative.
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Affiliation(s)
- Varun S Venkatesh
- Department of Medicine, Austin Health, The University of Melbourne, Heidelberg, Victoria, 3084, Australia
| | - Tian Nie
- Department of Medicine, Austin Health, The University of Melbourne, Heidelberg, Victoria, 3084, Australia
| | - Jeffrey D Zajac
- Department of Medicine, Austin Health, The University of Melbourne, Heidelberg, Victoria, 3084, Australia
- Department of Endocrinology, Austin Health, Heidelberg, Victoria, 3084, Australia
| | - Mathis Grossmann
- Department of Medicine, Austin Health, The University of Melbourne, Heidelberg, Victoria, 3084, Australia
- Department of Endocrinology, Austin Health, Heidelberg, Victoria, 3084, Australia
| | - Rachel A Davey
- Department of Medicine, Austin Health, The University of Melbourne, Heidelberg, Victoria, 3084, Australia.
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Doolittle ML, Eckhardt BA, Vos SJ, Grain S, Rowsey JL, Ruan M, Saul D, Farr JN, Weivoda MM, Khosla S, Monroe DG. Modest Effects of Osteoclast-Specific ERα Deletion after Skeletal Maturity. JBMR Plus 2023; 7:e10797. [PMID: 37808391 PMCID: PMC10556268 DOI: 10.1002/jbm4.10797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 06/15/2023] [Accepted: 06/28/2023] [Indexed: 10/10/2023] Open
Abstract
Estrogen regulates bone mass in women and men, but the underlying cellular mechanisms of estrogen action on bone remain unclear. Although both estrogen receptor (ER)α and ERβ are expressed in bone cells, ERα is the dominant receptor for skeletal estrogen action. Previous studies using either global or cell-specific ERα deletion provided important insights, but each of these approaches had limitations. Specifically, either high circulating sex steroid levels in global ERα knockout mice or the effects of deletion of ERα during growth and development in constitutive cell-specific knockout mice have made it difficult to clearly define the role of ERα in specific cell types in the adult skeleton. We recently generated and characterized mice with tamoxifen-inducible ERα deletion in osteocytes driven by the 8-kb Dmp1 promoter (ERαΔOcy mice), revealing detrimental effects of osteocyte-specific ERα deletion on trabecular bone volume (-20.1%) and bone formation rate (-18.9%) in female, but not male, mice. Here, we developed and characterized analogous mice with inducible ERα deletion in osteoclasts using the Cathepsin K promoter (ERαΔOcl mice). In a study design identical to that with the previously described ERαΔOcy mice, adult female, but not male, ERαΔOcl mice showed a borderline (-10.2%, p = 0.084) reduction in trabecular bone volume, no change in osteoclast numbers, but a significant increase in serum CTx levels, consistent with increased osteoclast activity. These findings in ERαΔOcl mice differ from previous studies of constitutive osteoclast-specific ERα deletion, which led to clear deficits in trabecular bone and increased osteoclast numbers. Collectively, these data indicate that in adult mice, estrogen action in the osteocyte is likely more important than via the osteoclast and that ERα deletion in osteoclasts from conception onward has more dramatic skeletal effects than inducible osteoclastic ERα deletion in adult mice. © 2023 The Authors. JBMR Plus published by Wiley Periodicals LLC on behalf of American Society for Bone and Mineral Research.
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Affiliation(s)
- Madison L. Doolittle
- Robert and Arlene Kogod Center on Aging and Division of EndocrinologyMayo Clinic College of MedicineRochesterMinnesotaUSA
| | - Brittany A. Eckhardt
- Robert and Arlene Kogod Center on Aging and Division of EndocrinologyMayo Clinic College of MedicineRochesterMinnesotaUSA
| | - Stephanie J. Vos
- Robert and Arlene Kogod Center on Aging and Division of EndocrinologyMayo Clinic College of MedicineRochesterMinnesotaUSA
| | - Sarah Grain
- Robert and Arlene Kogod Center on Aging and Division of EndocrinologyMayo Clinic College of MedicineRochesterMinnesotaUSA
| | - Jennifer L. Rowsey
- Robert and Arlene Kogod Center on Aging and Division of EndocrinologyMayo Clinic College of MedicineRochesterMinnesotaUSA
| | - Ming Ruan
- Robert and Arlene Kogod Center on Aging and Division of EndocrinologyMayo Clinic College of MedicineRochesterMinnesotaUSA
| | - Dominik Saul
- Robert and Arlene Kogod Center on Aging and Division of EndocrinologyMayo Clinic College of MedicineRochesterMinnesotaUSA
- Department of Trauma and Reconstructive SurgeryEberhard Karls University Tübingen, BG Trauma Center TübingenTübingenGermany
| | - Joshua N. Farr
- Robert and Arlene Kogod Center on Aging and Division of EndocrinologyMayo Clinic College of MedicineRochesterMinnesotaUSA
| | - Megan M. Weivoda
- Robert and Arlene Kogod Center on Aging and Division of HematologyMayo Clinic College of MedicineRochesterMinnesotaUSA
| | - Sundeep Khosla
- Robert and Arlene Kogod Center on Aging and Division of EndocrinologyMayo Clinic College of MedicineRochesterMinnesotaUSA
| | - David G. Monroe
- Robert and Arlene Kogod Center on Aging and Division of EndocrinologyMayo Clinic College of MedicineRochesterMinnesotaUSA
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Early evolution of enamel matrix proteins is reflected by pleiotropy of physiological functions. Sci Rep 2023; 13:1471. [PMID: 36702824 PMCID: PMC9879986 DOI: 10.1038/s41598-023-28388-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Accepted: 01/18/2023] [Indexed: 01/27/2023] Open
Abstract
Highly specialized enamel matrix proteins (EMPs) are predominantly expressed in odontogenic tissues and diverged from common ancestral gene. They are crucial for the maturation of enamel and its extreme complexity in multiple independent lineages. However, divergence of EMPs occured already before the true enamel evolved and their conservancy in toothless species suggests that non-canonical functions are still under natural selection. To elucidate this hypothesis, we carried out an unbiased, comprehensive phenotyping and employed data from the International Mouse Phenotyping Consortium to show functional pleiotropy of amelogenin, ameloblastin, amelotin, and enamelin, genes, i.e. in sensory function, skeletal morphology, cardiovascular function, metabolism, immune system screen, behavior, reproduction, and respiratory function. Mice in all KO mutant lines, i.e. amelogenin KO, ameloblastin KO, amelotin KO, and enamelin KO, as well as mice from the lineage with monomeric form of ameloblastin were affected in multiple physiological systems. Evolutionary conserved motifs and functional pleiotropy support the hypothesis of role of EMPs as general physiological regulators. These findings illustrate how their non-canonical function can still effect the fitness of modern species by an example of influence of amelogenin and ameloblastin on the bone physiology.
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Xu X, Yang H, Bullock WA, Gallant MA, Ohlsson C, Bellido TM, Main RP. Osteocyte Estrogen Receptor β (Ot-ERβ) Regulates Bone Turnover and Skeletal Adaptive Response to Mechanical Loading Differently in Male and Female Growing and Adult Mice. J Bone Miner Res 2023; 38:186-197. [PMID: 36321245 PMCID: PMC10108310 DOI: 10.1002/jbmr.4731] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 10/15/2022] [Accepted: 10/29/2022] [Indexed: 11/06/2022]
Abstract
Age-related bone loss is a failure of balanced bone turnover and diminished skeletal mechanoadaptation. Estrogen receptors, ERα and ERβ, play critical roles in osteoprotective regulation activated by estrogen and mechanical signals. Previous studies mainly focused on ERα and showed that osteocyte-ERα (Ot-ERα) regulated trabecular, but not cortical bone, and played a minor role in load-induced cortical adaptation. However, the role of Ot-ERβ in bone mass regulation remains unrevealed. To address this issue, we characterized bone (re)modeling and gene expression in male and female mice with Ot-ERβ deletion (ERβ-dOT) and littermate control (LC) at 10 weeks (young) or 28 weeks (adult) of age, as well as their responses to in vivo tibial compressive loading. Increased cancellous bone mass appeared in the L4 vertebral body of young male ERβ-dOT mice. At the same time, femoral cortical bone gene expression showed signs consistent with elevated osteoblast and osteoclast activities (type-I collagen, Cat K, RANKL). Upregulated androgen receptor (AR) expression was observed in young male ERβ-dOT mice relative to LC, suggesting a compensatory effect of testosterone on male bone protection. In contrast, bone mass in L4 decreased in adult male ERβ-dOT mice, attributed to potentially increased bone resorption activity (Cat K) with no change in bone formation. There was no effect of ERβ-dOT on bone mass or gene expression in female mice. Sex-dependent regulation of Ot-ERβ also appeared in load-induced cortical responsiveness. Young female ERβ-dOT mice showed an enhanced tibial cortical anabolic adaptation compared with LC. In contrast, an attenuated cortical anabolic response presented at the proximal tibia in male ERβ-dOT mice at both ages. For the first time, our findings suggest that Ot-ERβ regulates bone (re)modeling and the response to mechanical signals through different mechanisms in males and females. © 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)
- Xiaoyu Xu
- Weldon School of Biomedical EngineeringPurdue UniversityWest LafayetteINUSA
- Musculoskeletal Biology and Mechanics Lab, Department of Basic Medical SciencesPurdue UniversityWest LafayetteINUSA
| | - Haisheng Yang
- Department of Biomedical Engineering, Faculty of Environment and LifeBeijing University of TechnologyBeijingChina
| | | | - Maxim A. Gallant
- Musculoskeletal Biology and Mechanics Lab, Department of Basic Medical SciencesPurdue UniversityWest LafayetteINUSA
| | - Claes Ohlsson
- Sahlgrenska Osteoporosis Centre, Centre for Bone and Arthritis Research, Department of Internal Medicine and Clinical NutritionInstitute of Medicine, Sahlgrenska Academy, University of GothenburgGothenburgSweden
- Department of Drug TreatmentSahlgrenska University HospitalGothenburgSweden
| | - Teresita M. Bellido
- Department of Physiology and Cell BiologyUniversity of Arkansas for Medical SciencesLittle RockARUSA
| | - Russell P. Main
- Weldon School of Biomedical EngineeringPurdue UniversityWest LafayetteINUSA
- Musculoskeletal Biology and Mechanics Lab, Department of Basic Medical SciencesPurdue UniversityWest LafayetteINUSA
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Andrew TW, Koepke LS, Wang Y, Lopez M, Steininger H, Struck D, Boyko T, Ambrosi TH, Tong X, Sun Y, Gulati GS, Murphy MP, Marecic O, Telvin R, Schallmoser K, Strunk D, Seita J, Goodman SB, Yang F, Longaker MT, Yang GP, Chan CKF. Sexually dimorphic estrogen sensing in skeletal stem cells controls skeletal regeneration. Nat Commun 2022; 13:6491. [PMID: 36310174 PMCID: PMC9618571 DOI: 10.1038/s41467-022-34063-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Accepted: 10/05/2022] [Indexed: 12/25/2022] Open
Abstract
Sexually dimorphic tissues are formed by cells that are regulated by sex hormones. While a number of systemic hormones and transcription factors are known to regulate proliferation and differentiation of osteoblasts and osteoclasts, the mechanisms that determine sexually dimorphic differences in bone regeneration are unclear. To explore how sex hormones regulate bone regeneration, we compared bone fracture repair between adult male and female mice. We found that skeletal stem cell (SSC) mediated regeneration in female mice is dependent on estrogen signaling but SSCs from male mice do not exhibit similar estrogen responsiveness. Mechanistically, we found that estrogen acts directly on the SSC lineage in mice and humans by up-regulating multiple skeletogenic pathways and is necessary for the stem cell's ability to self- renew and differentiate. Our results also suggest a clinically applicable strategy to accelerate bone healing using localized estrogen hormone therapy.
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Affiliation(s)
- Tom W. Andrew
- grid.168010.e0000000419368956Department of Surgery, Stanford University School of Medicine, Stanford, CA 94305 USA ,grid.168010.e0000000419368956Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA 94305 USA
| | - Lauren S. Koepke
- grid.168010.e0000000419368956Department of Surgery, Stanford University School of Medicine, Stanford, CA 94305 USA
| | - Yuting Wang
- grid.168010.e0000000419368956Department of Surgery, Stanford University School of Medicine, Stanford, CA 94305 USA ,grid.412793.a0000 0004 1799 5032Department of Orthopaedic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Michael Lopez
- grid.168010.e0000000419368956Department of Surgery, Stanford University School of Medicine, Stanford, CA 94305 USA
| | - Holly Steininger
- grid.168010.e0000000419368956Department of Surgery, Stanford University School of Medicine, Stanford, CA 94305 USA
| | - Danielle Struck
- grid.168010.e0000000419368956Department of Surgery, Stanford University School of Medicine, Stanford, CA 94305 USA
| | - Tatiana Boyko
- grid.168010.e0000000419368956Department of Surgery, Stanford University School of Medicine, Stanford, CA 94305 USA
| | - Thomas H. Ambrosi
- grid.168010.e0000000419368956Department of Surgery, Stanford University School of Medicine, Stanford, CA 94305 USA
| | - Xinming Tong
- grid.168010.e0000000419368956Department of Bioengineering, Stanford University, Palo Alto, CA 94305 USA
| | - Yuxi Sun
- grid.265892.20000000106344187Department of Surgery, University of Alabama at Birmingham, Birmingham, AL 35233 USA ,grid.280808.a0000 0004 0419 1326Birmingham VA Medical Center, Birmingham, AL 35233 USA
| | - Gunsagar S. Gulati
- grid.168010.e0000000419368956Department of Surgery, Stanford University School of Medicine, Stanford, CA 94305 USA ,grid.168010.e0000000419368956Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA 94305 USA
| | - Matthew P. Murphy
- grid.168010.e0000000419368956Department of Surgery, Stanford University School of Medicine, Stanford, CA 94305 USA ,grid.168010.e0000000419368956Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA 94305 USA
| | - Owen Marecic
- grid.168010.e0000000419368956Department of Surgery, Stanford University School of Medicine, Stanford, CA 94305 USA
| | - Ruth Telvin
- grid.490568.60000 0004 5997 482XDivision of Plastic and Reconstructive Surgery, Stanford Hospital and Clinics, Palo Alto, CA USA
| | - Katharina Schallmoser
- grid.21604.310000 0004 0523 5263Spinal Cord Injury and Tissue Regeneration Center Salzburg (SCI-TReCS), Department for Transfusion Medicine, Paracelsus Medical University of Salzburg, Salzburg, Austria
| | - Dirk Strunk
- grid.21604.310000 0004 0523 5263Spinal Cord Injury and Tissue Regeneration Center Salzburg (SCI-TReCS), Department for Transfusion Medicine, Paracelsus Medical University of Salzburg, Salzburg, Austria ,grid.21604.310000 0004 0523 5263Cell Therapy Institute, Paracelsus Medical University of Salzburg, Salzburg, Austria
| | - Jun Seita
- grid.7597.c0000000094465255Center for Integrative Medical Sciences and Advanced Data Science Project, RIKEN, Tokyo, Japan
| | - Stuart B. Goodman
- grid.168010.e0000000419368956Department of Orthopedic Surgery, Stanford University, Palo Alto, CA 94305 USA
| | - Fan Yang
- grid.168010.e0000000419368956Department of Bioengineering, Stanford University, Palo Alto, CA 94305 USA ,grid.168010.e0000000419368956Department of Orthopedic Surgery, Stanford University, Palo Alto, CA 94305 USA
| | - Michael T. Longaker
- grid.168010.e0000000419368956Department of Surgery, Stanford University School of Medicine, Stanford, CA 94305 USA ,grid.168010.e0000000419368956Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA 94305 USA
| | - George P. Yang
- grid.265892.20000000106344187Department of Surgery, University of Alabama at Birmingham, Birmingham, AL 35233 USA ,grid.280808.a0000 0004 0419 1326Birmingham VA Medical Center, Birmingham, AL 35233 USA
| | - Charles K. F. Chan
- grid.168010.e0000000419368956Department of Surgery, Stanford University School of Medicine, Stanford, CA 94305 USA ,grid.168010.e0000000419368956Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA 94305 USA
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Doolittle ML, Saul D, Kaur J, Rowsey JL, Eckhardt B, Vos S, Grain S, Kroupova K, Ruan M, Weivoda M, Oursler MJ, Farr JN, Monroe DG, Khosla S. Skeletal Effects of Inducible ERα Deletion in Osteocytes in Adult Mice. J Bone Miner Res 2022; 37:1750-1760. [PMID: 35789113 PMCID: PMC9474695 DOI: 10.1002/jbmr.4644] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 06/28/2022] [Accepted: 07/02/2022] [Indexed: 11/12/2022]
Abstract
Estrogen is known to regulate bone metabolism in both women and men, but substantial gaps remain in our knowledge of estrogen and estrogen receptor alpha (ERα) regulation of adult bone metabolism. Studies using global ERα-knockout mice were confounded by high circulating sex-steroid levels, and osteocyte/osteoblast-specific ERα deletion may be confounded by ERα effects on growth versus the adult skeleton. Thus, we developed mice expressing the tamoxifen-inducible CreERT2 in osteocytes using the 8-kilobase (kb) Dmp1 promoter (Dmp1CreERT2 ). These mice were crossed with ERαfl//fl mice to create ERαΔOcy mice, permitting inducible osteocyte-specific ERα deletion in adulthood. After intermittent tamoxifen treatment of adult 4-month-old mice for 1 month, female, but not male, ERαΔOcy mice exhibited reduced spine bone volume fraction (BV/TV (-20.1%, p = 0.004) accompanied by decreased trabecular bone formation rate (-18.9%, p = 0.0496) and serum P1NP levels (-38.9%, p = 0.014). Periosteal (+65.6%, p = 0.004) and endocortical (+64.1%, p = 0.003) expansion were higher in ERαΔOcy mice compared to control (Dmp1CreERT2 ) mice at the tibial diaphysis, reflecting the known effects of estrogen to inhibit periosteal apposition and promote endocortical formation. Increases in Sost (2.1-fold, p = 0.001) messenger RNA (mRNA) levels were observed in trabecular bone at the spine in ERαΔOcy mice, consistent with previous reports that estrogen deficiency is associated with increased circulating sclerostin as well as bone SOST mRNA levels in humans. Further, the biological consequences of increased Sost expression were reflected in significant overall downregulation in panels of osteoblast and Wnt target genes in osteocyte-enriched bones from ERαΔOcy mice. These findings thus establish that osteocytic ERα is critical for estrogen action in female, but not male, adult bone metabolism. Moreover, the reduction in bone formation accompanied by increased Sost, decreased osteoblast, and decreased Wnt target gene expression in ERαΔOcy mice provides a direct link in vivo between ERα and Wnt signaling. © 2022 American Society for Bone and Mineral Research (ASBMR).
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Affiliation(s)
- Madison L. Doolittle
- Robert and Arlene Kogod Center on Aging and Division of Endocrinology, Mayo Clinic College of Medicine, Rochester, MN
| | - Dominik Saul
- Robert and Arlene Kogod Center on Aging and Division of Endocrinology, Mayo Clinic College of Medicine, Rochester, MN
| | - Japneet Kaur
- Robert and Arlene Kogod Center on Aging and Division of Endocrinology, Mayo Clinic College of Medicine, Rochester, MN
| | - Jennifer L. Rowsey
- Robert and Arlene Kogod Center on Aging and Division of Endocrinology, Mayo Clinic College of Medicine, Rochester, MN
| | - Brittany Eckhardt
- Robert and Arlene Kogod Center on Aging and Division of Endocrinology, Mayo Clinic College of Medicine, Rochester, MN
| | - Stephanie Vos
- Robert and Arlene Kogod Center on Aging and Division of Endocrinology, Mayo Clinic College of Medicine, Rochester, MN
| | - Sarah Grain
- Robert and Arlene Kogod Center on Aging and Division of Endocrinology, Mayo Clinic College of Medicine, Rochester, MN
| | - Kveta Kroupova
- Robert and Arlene Kogod Center on Aging and Division of Endocrinology, Mayo Clinic College of Medicine, Rochester, MN
- University Hospital Hradec Kralove and the Faculty of Medicine in Hradec Kralove, Czech Republic
| | - Ming Ruan
- Robert and Arlene Kogod Center on Aging and Division of Endocrinology, Mayo Clinic College of Medicine, Rochester, MN
| | - Megan Weivoda
- Robert and Arlene Kogod Center on Aging and Division of Hematology, Mayo Clinic College of Medicine, Rochester, MN
| | - Merry Jo Oursler
- Robert and Arlene Kogod Center on Aging and Division of Endocrinology, Mayo Clinic College of Medicine, Rochester, MN
| | - Joshua N. Farr
- Robert and Arlene Kogod Center on Aging and Division of Endocrinology, Mayo Clinic College of Medicine, Rochester, MN
| | - David G. Monroe
- Robert and Arlene Kogod Center on Aging and Division of Endocrinology, Mayo Clinic College of Medicine, Rochester, MN
| | - Sundeep Khosla
- Robert and Arlene Kogod Center on Aging and Division of Endocrinology, Mayo Clinic College of Medicine, Rochester, MN
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Fu S, Ping P, Li Y, Li B, Zhao Y, Yao Y, Zhang P. Centenarian longevity had inverse relationships with nutritional status and abdominal obesity and positive relationships with sex hormones and bone turnover in the oldest females. J Transl Med 2021; 19:436. [PMID: 34663361 PMCID: PMC8522151 DOI: 10.1186/s12967-021-03115-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 10/09/2021] [Indexed: 01/13/2023] Open
Abstract
Objective The number of older people is estimated to increase from 524 million in 2010 to 1.5 billion in 2050. The factors and models of human longevity and successful aging are questions that have intrigued individuals for thousands of years. For the first time, the current study was designed to investigate the relationships between sex hormones, bone turnover, abdominal obesity, nutritional status and centenarian longevity in the oldest females. Methods The China Hainan Centenarian Cohort Study was performed in 18 cities and counties of Hainan Province using standard methodology in 500 centenarian females and 237 oldest females aged between 80 and 99 years. Results Centenarians were inversely associated with the geriatric nutritional risk index [Exp(B) (95% CI): 0.901 (0.883–0.919)] and abdominal obesity [Exp(B) (95% CI): 0.719 (0.520–0.996)] and positively associated with prolactin [Exp(B) (95% CI): 1.073 (1.044–1.103)], progesterone [Exp(B) (95% CI): 44.182 (22.036–88.584)], estradiol [Exp(B) (95% CI): 1.094 (1.071–1.119)], osteocalcin [Exp(B) (95% CI): 1.041 (1.028–1.054)], β-crossLaps [Exp(B) (95% CI): 63.141 (24.482–162.848)] and parathyroid [Exp(B) (95% CI): 1.022 (1.013–1.031)] hormone levels (P < 0.05 for all). The geriatric nutritional risk index and abdominal obesity were inversely associated with luteinizing hormone [β coefficient (95% CI): − 0.001 (− 0.002 to 0.001)]; Exp(B) (95% CI): 0.985 (0.974–0.996)], follicle-stimulating hormone [β coefficient (95% CI): 0.000 (− 0.001 to 0.000)]; Exp(B) (95% CI): 0.990 (0.985–0.996)], osteocalcin [β coefficient (95% CI): − 0.001 (− 0.001 to 0.000)]; Exp(B) (95% CI): 0.987(0.977–0.997)] and β-crossLaps [β coefficient (95% CI): − 0.100 (− 0.130 to 0.071)]; Exp(B) (95% CI): 0.338 (0.166–0.689)] levels (P < 0.05 for all). Conclusions Centenarian longevity had inverse relationships with nutritional status and abdominal obesity and positive relationships with sex hormones and bone turnover. Nutritional status and abdominal obesity had inverse relationships with sex hormones and bone turnover. Increased sex hormones and bone turnover may be representative of centenarian longevity. Optimizing nutritional status and avoiding abdominal obesity may increase sex hormones and bone turnover and promote centenarian longevity and successful aging.
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Affiliation(s)
- Shihui Fu
- Cardiology Department, Hainan Hospital of Chinese People's Liberation Army General Hospital, Sanya, China. .,Department of Geriatric Cardiology, Chinese People's Liberation Army General Hospital, Beijing, China.
| | - Ping Ping
- Pharmacy Department, Chinese People's Liberation Army General Hospital, Beijing, China
| | - Yulong Li
- Department of Geriatric Cardiology, Chinese People's Liberation Army General Hospital, Beijing, China
| | - Bo Li
- Cardiology Department, Hainan Hospital of Chinese People's Liberation Army General Hospital, Sanya, China
| | - Yali Zhao
- Central Laboratory, Hainan Hospital of Chinese People's Liberation Army General Hospital, Sanya, China.
| | - Yao Yao
- Center for Healthy Aging and Development Studies, National School of Development, Peking University, Beijing, China.
| | - Pei Zhang
- School of Life Science, Beijing Institute of Technology, Beijing, China.
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8
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The Development of Molecular Biology of Osteoporosis. Int J Mol Sci 2021; 22:ijms22158182. [PMID: 34360948 PMCID: PMC8347149 DOI: 10.3390/ijms22158182] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2021] [Revised: 07/25/2021] [Accepted: 07/26/2021] [Indexed: 02/07/2023] Open
Abstract
Osteoporosis is one of the major bone disorders that affects both women and men, and causes bone deterioration and bone strength. Bone remodeling maintains bone mass and mineral homeostasis through the balanced action of osteoblasts and osteoclasts, which are responsible for bone formation and bone resorption, respectively. The imbalance in bone remodeling is known to be the main cause of osteoporosis. The imbalance can be the result of the action of various molecules produced by one bone cell that acts on other bone cells and influence cell activity. The understanding of the effect of these molecules on bone can help identify new targets and therapeutics to prevent and treat bone disorders. In this article, we have focused on molecules that are produced by osteoblasts, osteocytes, and osteoclasts and their mechanism of action on these cells. We have also summarized the different pharmacological osteoporosis treatments that target different molecular aspects of these bone cells to minimize osteoporosis.
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Ikedo A, Imai Y. Estrogen receptor α in mature osteoblasts regulates the late stage of bone regeneration. Biochem Biophys Res Commun 2021; 559:238-244. [PMID: 33964733 DOI: 10.1016/j.bbrc.2021.04.112] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 04/27/2021] [Indexed: 11/16/2022]
Abstract
Estrogen deficiency impairs fracture healing and homeostasis of bone tissue. OVX-induced estrogen deficiency in mice attenuates fracture healing and changes the expression ratio of estrogen receptor (ER) α and ERβ in callus during the process of fracture healing. Therefore, ERs may be involved in the regulation of fracture healing. However, the roles of ERs in fracture healing are largely unknown. The purpose of this study was to clarify the significance of ERs during fracture healing using osteoblast-specific ER knockout mice in a mono-cortical drill hole bone regeneration model. The mature osteoblast-specific ER knockout mice were generated using osteocalcin (OCN)-Cre mice, and ERα and ERβ flox mice (OCN-Cre; ERαf/f, ERαΔOb/ΔOb and OCN-Cre; ERβf/f, ERβΔOb/ΔOb). Drill hole surgery was conducted on the tibiae of 8-week-old female mice. The mice were sacrificed 10 or 14 days after surgery and the bones were analyzed by DXA, μCT and bone histomorphometry. DXA analysis revealed that intact femoral BMD was significantly decreased in ERαΔOb/ΔOb mice compared with ERαf/f mice, but there was no difference in bone mass between ERβΔOb/ΔOb and ERβf/f mice. Micro CT analyses showed that the callus volume at the restricted drill hole site in tibiae was significantly less in ERαΔOb/ΔOb compared to ERαf/f mice only at day 14 but not at day 10. In addition to femoral BMD, there was no significant difference in callus volume between ERβΔOb/ΔOb and ERβf/f mice. Bone histomorphometric analyses showed that Ob.S/BS and N.Ob/B.Pm were significantly less in ERαΔOb/ΔOb mice compared with ERαf/f mice only at day 10. In addition, Oc.S/BS and N.Oc/B.Pm were significantly less in ERαΔOb/ΔOb mice compared with ERαf/f mice only at day 14. These results suggest that ERα but not ERβ in osteocalcin-positive osteoblasts may contribute to the late stage of bone regeneration.
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Affiliation(s)
- Aoi Ikedo
- Division of Integrative Pathophysiology, Proteo-Science Center, Ehime University, Ehime, Japan
| | - Yuuki Imai
- Division of Integrative Pathophysiology, Proteo-Science Center, Ehime University, Ehime, Japan; Department of Pathophysiology, Ehime University Graduate School of Medicine, Ehime, Japan.
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10
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Aljohani H, Stains JP, Majumdar S, Srinivasan D, Senbanjo L, Chellaiah MA. Peptidomimetic inhibitor of L-plastin reduces osteoclastic bone resorption in aging female mice. Bone Res 2021; 9:22. [PMID: 33837180 PMCID: PMC8035201 DOI: 10.1038/s41413-020-00135-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 11/22/2020] [Accepted: 11/26/2020] [Indexed: 12/12/2022] Open
Abstract
L-plastin (LPL) was identified as a potential regulator of the actin-bundling process involved in forming nascent sealing zones (NSZs), which are precursor zones for mature sealing zones. TAT-fused cell-penetrating small molecular weight LPL peptide (TAT- MARGSVSDEE, denoted as an inhibitory LPL peptide) attenuated the formation of NSZs and impaired bone resorption in vitro in osteoclasts. Also, the genetic deletion of LPL in mice demonstrated decreased eroded perimeters and increased trabecular bone density. In the present study, we hypothesized that targeting LPL with the inhibitory LPL peptide in vivo could reduce osteoclast function and increase bone density in a mice model of low bone mass. We injected aging C57BL/6 female mice (36 weeks old) subcutaneously with the inhibitory and scrambled peptides of LPL for 14 weeks. Micro-CT and histomorphometry analyses demonstrated an increase in trabecular bone density of femoral and tibial bones with no change in cortical thickness in mice injected with the inhibitory LPL peptide. A reduction in the serum levels of CTX-1 peptide suggests that the increase in bone density is associated with a decrease in osteoclast function. No changes in bone formation rate and mineral apposition rate, and the serum levels of P1NP indicate that the inhibitory LPL peptide does not affect osteoblast function. Our study shows that the inhibitory LPL peptide can block osteoclast function without impairing the function of osteoblasts. LPL peptide could be developed as a prospective therapeutic agent to treat osteoporosis.
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Affiliation(s)
- Hanan Aljohani
- Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland, Baltimore, MD, USA
- Department of Oral Medicine and Diagnostics Sciences, King Saud University, School of Dentistry, Riyadh, Kingdom of Saudi Arabia
| | - Joseph P Stains
- Department of Orthopedics, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Sunipa Majumdar
- Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland, Baltimore, MD, USA
| | - Deepa Srinivasan
- Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland, Baltimore, MD, USA
| | - Linda Senbanjo
- Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland, Baltimore, MD, USA
| | - Meenakshi A Chellaiah
- Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland, Baltimore, MD, USA.
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11
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Noirrit-Esclassan E, Valera MC, Tremollieres F, Arnal JF, Lenfant F, Fontaine C, Vinel A. Critical Role of Estrogens on Bone Homeostasis in Both Male and Female: From Physiology to Medical Implications. Int J Mol Sci 2021; 22:ijms22041568. [PMID: 33557249 PMCID: PMC7913980 DOI: 10.3390/ijms22041568] [Citation(s) in RCA: 57] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 01/29/2021] [Accepted: 02/01/2021] [Indexed: 02/07/2023] Open
Abstract
Bone is a multi-skilled tissue, protecting major organs, regulating calcium phosphate balance and producing hormones. Its development during childhood determines height and stature as well as resistance against fracture in advanced age. Estrogens are key regulators of bone turnover in both females and males. These hormones play a major role in longitudinal and width growth throughout puberty as well as in the regulation of bone turnover. In women, estrogen deficiency is one of the major causes of postmenopausal osteoporosis. In this review, we will summarize the main clinical and experimental studies reporting the effects of estrogens not only in females but also in males, during different life stages. Effects of estrogens on bone involve either Estrogen Receptor (ER)α or ERβ depending on the type of bone (femur, vertebrae, tibia, mandible), the compartment (trabecular or cortical), cell types involved (osteoclasts, osteoblasts and osteocytes) and sex. Finally, we will discuss new ongoing strategies to increase the benefit/risk ratio of the hormonal treatment of menopause.
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Affiliation(s)
- Emmanuelle Noirrit-Esclassan
- I2MC, INSERM UMR 1297, University of Toulouse III, F-31000 Toulouse, France; (E.N.-E.); (M.-C.V.); (F.T.); (J.-F.A.); (F.L.); (C.F.)
- Department of Pediatric Dentistry, Faculty of Dental Surgery, University of Toulouse III, F-31000 Toulouse, France
| | - Marie-Cécile Valera
- I2MC, INSERM UMR 1297, University of Toulouse III, F-31000 Toulouse, France; (E.N.-E.); (M.-C.V.); (F.T.); (J.-F.A.); (F.L.); (C.F.)
- Department of Pediatric Dentistry, Faculty of Dental Surgery, University of Toulouse III, F-31000 Toulouse, France
| | - Florence Tremollieres
- I2MC, INSERM UMR 1297, University of Toulouse III, F-31000 Toulouse, France; (E.N.-E.); (M.-C.V.); (F.T.); (J.-F.A.); (F.L.); (C.F.)
- Menopause and Metabolic Bone Disease Center, Hôpital Paule de Viguier, University Hospital of Toulouse, F-31000 Toulouse, France
| | - Jean-Francois Arnal
- I2MC, INSERM UMR 1297, University of Toulouse III, F-31000 Toulouse, France; (E.N.-E.); (M.-C.V.); (F.T.); (J.-F.A.); (F.L.); (C.F.)
| | - Françoise Lenfant
- I2MC, INSERM UMR 1297, University of Toulouse III, F-31000 Toulouse, France; (E.N.-E.); (M.-C.V.); (F.T.); (J.-F.A.); (F.L.); (C.F.)
| | - Coralie Fontaine
- I2MC, INSERM UMR 1297, University of Toulouse III, F-31000 Toulouse, France; (E.N.-E.); (M.-C.V.); (F.T.); (J.-F.A.); (F.L.); (C.F.)
| | - Alexia Vinel
- I2MC, INSERM UMR 1297, University of Toulouse III, F-31000 Toulouse, France; (E.N.-E.); (M.-C.V.); (F.T.); (J.-F.A.); (F.L.); (C.F.)
- Department of Periodontology, Faculty of Dental Surgery, University of Toulouse III, F-31000 Toulouse, France
- Correspondence: ; Tel.: +33-5-61-77-36-10
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12
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Ohlsson C, Farman HH, Gustafsson KL, Wu J, Henning P, Windahl SH, Sjögren K, Gustafsson JÅ, Movérare-Skrtic S, Lagerquist MK. The effects of estradiol are modulated in a tissue-specific manner in mice with inducible inactivation of ERα after sexual maturation. Am J Physiol Endocrinol Metab 2020; 318:E646-E654. [PMID: 32125882 DOI: 10.1152/ajpendo.00018.2020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Mouse models with lifelong inactivation of estrogen receptor-α (ERα) show that ERα is the main mediator of estrogenic effects in bone, thymus, uterus, and fat. However, ERα inactivation early in life may cause developmental effects that confound the adult phenotypes. To address the specific role of adult ERα expression for estrogenic effects in bone and other nonskeletal tissues, we established a tamoxifen-inducible ERα-inactivated model by crossing CAGG-Cre-ER and ERαflox/flox mice. Tamoxifen-induced ERα inactivation after sexual maturation substantially reduced ERα mRNA levels in cortical bone, trabecular bone, thymus, uterus, gonadal fat, and hypothalamus, in CAGG-Cre-ERαflox/flox (inducible ERαKO) compared with ERαflox/flox (control) mice. 17β-estradiol (E2) treatment increased trabecular bone volume fraction (BV/TV), cortical bone area, and uterine weight, while it reduced thymus weight and fat mass in ovariectomized control mice. The estrogenic responses were substantially reduced in inducible ERαKO mice compared with control mice on BV/TV (-67%), uterine weight (-94%), thymus weight (-70%), and gonadal fat mass (-94%). In contrast, the estrogenic response on cortical bone area was unaffected in inducible ERαKO compared with control mice. In conclusion, using an inducible ERαKO model, not confounded by lack of ERα during development, we demonstrate that ERα expression in sexually mature female mice is required for normal E2 responses in most, but not all, tissues. The finding that cortical, but not trabecular bone, responds normally to E2 treatment in inducible ERαKO mice strengthens the idea of cortical and trabecular bone being regulated by estrogen via different mechanisms.
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Affiliation(s)
- Claes Ohlsson
- Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Helen H Farman
- Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Karin L Gustafsson
- Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Jianyao Wu
- Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Petra Henning
- Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Sara H Windahl
- Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
- Department of Laboratory Medicine, Division of Pathology, Karolinska Institute, Huddinge, Sweden
| | - Klara Sjögren
- Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Jan-Åke Gustafsson
- Center for Nuclear Receptors and Cell Signaling, University of Houston, Houston, Texas
- Department of Biosciences and Nutrition, Center for Innovative Medicine, Karolinska Institute, Novum, Sweden
| | - Sofia Movérare-Skrtic
- Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Marie K Lagerquist
- Centre for Bone and Arthritis Research at Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
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13
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Hammes SR, Levin ER. Impact of estrogens in males and androgens in females. J Clin Invest 2019; 129:1818-1826. [PMID: 31042159 DOI: 10.1172/jci125755] [Citation(s) in RCA: 96] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Androgens and estrogens are known to be critical regulators of mammalian physiology and development. While these two classes of steroids share similar structures (in general, estrogens are derived from androgens via the enzyme aromatase), they subserve markedly different functions via their specific receptors. In the past, estrogens such as estradiol were thought to be most important in the regulation of female biology, while androgens such as testosterone and dihydrotestosterone were believed to primarily modulate development and physiology in males. However, the emergence of patients with deficiencies in androgen or estrogen hormone synthesis or actions, as well as the development of animal models that specifically target androgen- or estrogen-mediated signaling pathways, have revealed that estrogens and androgens regulate critical biological and pathological processes in both males and females. In fact, the concept of "male" and "female" hormones is an oversimplification of a complex developmental and biological network of steroid actions that directly impacts many organs. In this Review, we will discuss important roles of estrogens in males and androgens in females.
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Affiliation(s)
- Stephen R Hammes
- Division of Endocrinology and Metabolism, Department of Medicine, University of Rochester School of Medicine, Rochester, New York, USA
| | - Ellis R Levin
- Departments of Medicine and Biochemistry, UCI, Irvine, California, USA.,Division of Endocrinology, UCI and United States Department of Veterans Affairs Medical Center, Long Beach, California, USA
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14
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Age-related bone loss and sarcopenia in men. Maturitas 2019; 122:51-56. [PMID: 30797530 DOI: 10.1016/j.maturitas.2019.01.006] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2019] [Revised: 01/20/2019] [Accepted: 01/22/2019] [Indexed: 12/20/2022]
Abstract
Bone and muscle are required for mobility but they also have endocrine and metabolic functions. In ageing as well as in many chronic diseases, bone loss and muscle atrophy occur simultaneously, leading to concomitant osteoporosis and sarcopenia. This occurs in both genders but compared with postmenopausal women, men appear to be better protected against age-related bone and muscle decay. Sex steroids (both androgens like testosterone and oestrogens like estradiol) are mainly responsible for musculoskeletal sexual dimorphism. They stimulate peak bone and muscle mass accretion during puberty and midlife, and prevent subsequent loss in ageing men but not post-menopausal women. Still, recent studies have highlighted the importance of intrinsic ageing mechanisms such as cellular senescence and oxidative stress in both genders. Sarcopenia may predispose to dysmobility, frailty, falls and fractures, but whether so-called osteosarcopenia qualifies as a distinct entity remains debated. Although randomized clinical trials in male osteoporosis are smaller and therefore underpowered for some outcomes like hip fractures, the available evidence suggests that the clinical diagnostic and therapeutic approach to male osteoporosis is largely similar to that in postmenopausal women. There is a clear unmet medical need for effective and safe anabolic drugs to rebuild the ageing skeleton, muscle, and preferably both tissues simultaneously. The Wnt/sclerostin and myostatin/activin receptor signalling pathways appear particularly promising in this regard. In this narrative review, we aim to provide an overview of our current understanding of the pathophysiology and treatment of male osteoporosis and sarcopenia, and interactions between these two diseases.
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15
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Abstract
In both sexes, estrogen is one of the most essential hormones for maintaining bone integrity. Also, especially in men, androgen has beneficial effects on bone independent of estrogen. However, estrogen replacement therapy for postmenopausal women increases the risk of developing breast cancer and endometrial cancer, and androgen replacement therapy for partial androgen deficiency of the aging male increases the risk of developing prostate cancer. Various mechanisms have been proposed on the effects of gonadal hormones on bone, such as effects through cytokines including IL-6 and effects on the OPG/RANKL ratio. In addition, large amounts of new information deriving from high-throughput gene expression analysis raise the possibility of multiple other effects on bone cells. Both estrogen and androgen exert their effects via the estrogen receptor (ER) or the androgen receptor (AR), which belongs to the nuclear receptor superfamily. Compounds such as selective estrogen receptor modulators (SERMs) and selective androgen receptor modulators (SARMs) also bind ER and AR, respectively. However, SERMs and SARMs alter the ER or AR structure differently from estrogen or androgen, resulting in other downstream gene responses. As a result they can exert favorable effects on bone while suppressing the undesirable actions of estrogen and androgen. Elucidation of ER and AR ligand-specific and tissue-specific gene regulation mechanisms will also provide information on the signal transduction mechanisms of other nuclear receptors and will be valuable for the development of new therapeutic agents.
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16
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Rosales Rocabado JM, Kaku M, Nozaki K, Ida T, Kitami M, Aoyagi Y, Uoshima K. A multi-factorial analysis of bone morphology and fracture strength of rat femur in response to ovariectomy. J Orthop Surg Res 2018; 13:318. [PMID: 30545382 PMCID: PMC6293566 DOI: 10.1186/s13018-018-1018-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 11/26/2018] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND Postmenopausal osteoporosis develops due to a deficiency of estrogen that causes a decrease in bone mass and changes in the macro- and micro-architectural structure of the bone, leading to the loss of mechanical strength and an increased risk of fracture. Although the assessment of bone mineral density (BMD) has been widely used as a gold standard for diagnostic screening of bone fracture risks, it accounts for only a part of the variation in bone fragility; thus, it is necessary to consider other determinants of bone strength. Therefore, we aimed to comprehensively evaluate the architectural changes of the bone that influence bone fracture strength, together with the different sensitivities of cortical and trabecular bone in response to ovariectomy (OVX). METHODS Bone morphology parameters were separately analyzed both in cortical and in trabecular bones, at distal-metaphysis, and mid-diaphysis of OVX rat femurs. Three-point bending test was performed at mid-diaphysis of the femurs. Correlation of OVX-induced changes of morphological parameters with breaking force was analyzed using Pearson's correlation coefficient. RESULTS OVX resulted in a decline in the bone volume of distal-metaphysis trabecular bone, but an increase in distal-metaphysis and mid-diaphysis cortical bone volume. Tissue mineral density (TMD) remained unchanged in both the trabecular and cortical bone of the distal metaphysis but decreased in cortical bone of the mid-diaphysis. The OVX significantly increased the breaking force at mid-diaphysis of the femurs. CONCLUSIONS OVX decreased the trabecular bone volume of the distal-metaphysis and increased the cortical bone volume of the distal-metaphysis and mid-diaphysis. Despite the reduction in TMD and increased cortical porosity, bone fracture strength increased in the mid-diaphysis after OVX. These results indicate that analyzing a single factor, i.e., BMD, is not sufficient to predict the absolute fracture risk of the bone, as OVX-induced bone response vary, depending on the bone type and location. Our results strongly support the necessity of analyzing bone micro-architecture and site specificity to clarify the true etiology of osteoporosis in a clinical setting.
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Affiliation(s)
| | - Masaru Kaku
- Division of Bio-Prosthodontics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Kosuke Nozaki
- Department of Biofunction Research, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Tokyo, Japan
| | - Takako Ida
- Division of Bio-Prosthodontics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Megumi Kitami
- Division of Bio-Prosthodontics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Yujin Aoyagi
- Division of Bio-Prosthodontics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Katsumi Uoshima
- Division of Bio-Prosthodontics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
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17
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Khosla S, Monroe DG. Regulation of Bone Metabolism by Sex Steroids. Cold Spring Harb Perspect Med 2018; 8:cshperspect.a031211. [PMID: 28710257 DOI: 10.1101/cshperspect.a031211] [Citation(s) in RCA: 132] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Osteoporosis is a significant public health problem, and a major cause of the disease is estrogen deficiency following menopause in women. In addition, considerable evidence now shows that estrogen is also a major regulator of bone metabolism in men. Since the original description of the effects of estrogen deficiency on bone by Fuller Albright more than 70 years ago, there has been enormous progress in understanding the mechanisms of estrogen and testosterone action on bone using human and mouse models. Although we understand more about the effects of estrogen on bone as compared with testosterone, both sex steroids do play important roles, perhaps in a somewhat compartment-specific (i.e., cancellous vs. cortical bone) manner. This review summarizes our current knowledge of sex steroid action on bone based on human and mouse studies, identifies both agreements and potential discrepancies between these studies, and suggests directions for future research in this important area.
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Affiliation(s)
- Sundeep Khosla
- Robert and Arlene Kogod Center on Aging and Endocrine Research Unit, Mayo Clinic College of Medicine, Rochester, Minnesota 55905
| | - David G Monroe
- Robert and Arlene Kogod Center on Aging and Endocrine Research Unit, Mayo Clinic College of Medicine, Rochester, Minnesota 55905
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18
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Rooney AM, van der Meulen MCH. Mouse models to evaluate the role of estrogen receptor α in skeletal maintenance and adaptation. Ann N Y Acad Sci 2017; 1410:85-92. [PMID: 29148577 DOI: 10.1111/nyas.13523] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Revised: 09/11/2017] [Accepted: 09/13/2017] [Indexed: 12/15/2022]
Abstract
Estrogen signaling and mechanical loading have individual and combined effects on skeletal maintenance and adaptation. Previous work investigating estrogen signaling both in vitro and in vivo using global estrogen receptor α (ERα) gene knockout mouse models has provided information regarding the role of ERα in regulating bone mass and adaptation to mechanical stimulation. However, these models have inherent limitations that confound interpretation of the data. Therefore, recent studies have focused on mice with targeted deletion of ERα from specific bone cells and their precursors. Cell stage, tissue type, and mouse sex all influence the effects of ERα gene deletion. Lack of ERα in osteoblast progenitor and precursor cells generally affects the periosteum of female and male mice. The absence of ERα in differentiated osteoblasts, osteocytes, and osteoclasts in mice generally resulted in reduced cancellous bone mass, with differing reports of the effect by animal sex and greater deficiencies in bone mass typically occurring in cancellous bone in female mice. Limited data exist for the role of bone cell-specific ERα in skeletal adaptation in vivo. Cell-specific ERα gene knockout mice provide an excellent platform for investigating the function of ERα in regulating skeletal phenotype and response to mechanical loading by sex and age.
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Affiliation(s)
- Amanda M Rooney
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, New York
| | - Marjolein C H van der Meulen
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, New York.,Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York.,Research Division, Hospital for Special Surgery, New York, New York
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19
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Zhong ZA, Kot A, Lay YAE, Zhang H, Jia J, Lane NE, Yao W. Sex-Dependent, Osteoblast Stage-Specific Effects of Progesterone Receptor on Bone Acquisition. J Bone Miner Res 2017; 32:1841-1852. [PMID: 28569405 PMCID: PMC5611815 DOI: 10.1002/jbmr.3186] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 05/22/2017] [Accepted: 05/27/2017] [Indexed: 12/12/2022]
Abstract
The role of the progesterone receptor (PR) in the regulation of sexual dimorphism in bone has yet to be determined. Here we utilized genetic fate mapping and Western blotting to demonstrate age-dependent PR expression in the mouse femoral metaphysis and diaphysis. To define sex-dependent and osteoblast stage-specific effects of PR on bone acquisition, we selectively deleted PR at different stages of osteoblast differentiation. We found that when Prx1-Cre mice were crossed with PR floxed mice to generate a mesenchymal stem cell (MSC) conditional KO model (Prx1; PRcKO), the mutant mice developed greater trabecular bone volume with higher mineral apposition rate and bone formation. This may be explained by increased number of MSCs and greater osteogenic potential, particularly in males. Age-related trabecular bone loss was similar between the Prx1; PRcKO mice and their WT littermates in both sexes. Hormone deficiency during the period of rapid bone growth induced rapid trabecular bone loss in both the WT and the Prx1; PRcKO mice in both sexes. No differences in trabecular bone mass was observed when PR was deleted in mature osteoblasts using osteocalcin-Cre (Bglap-Cre). Also, there were no differences in cortical bone mass in all three PRcKO mice. In conclusion, PR inactivation in early osteoprogenitor cells but not in mature osteoblasts influenced trabecular bone accrual in a sex-dependent manner. PR deletion in osteoblast lineage cells did not affect cortical bone mass. © 2017 American Society for Bone and Mineral Research.
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Affiliation(s)
- Zhendong A Zhong
- Center for Musculoskeletal Health, Department of Internal Medicine, University of California Davis Medical Center, Sacramento, CA, USA.,Center for Cancer and Cell Biology, Program in Skeletal Disease and Tumor Microenvironment, Van Andel Research Institute, Grand Rapids, MI, USA
| | - Alexander Kot
- Center for Musculoskeletal Health, Department of Internal Medicine, University of California Davis Medical Center, Sacramento, CA, USA
| | - Yu-An E Lay
- Center for Musculoskeletal Health, Department of Internal Medicine, University of California Davis Medical Center, Sacramento, CA, USA
| | - Hongliang Zhang
- Center for Musculoskeletal Health, Department of Internal Medicine, University of California Davis Medical Center, Sacramento, CA, USA.,Department of Emergency Medicine, Center for Rare Diseases, Second Xiangya Hospital of the Central-South University, China
| | - Junjing Jia
- Center for Musculoskeletal Health, Department of Internal Medicine, University of California Davis Medical Center, Sacramento, CA, USA.,Yuannan Agricultural University, Kunming, Yuannan, China
| | - Nancy E Lane
- Center for Musculoskeletal Health, Department of Internal Medicine, University of California Davis Medical Center, Sacramento, CA, USA
| | - Wei Yao
- Center for Musculoskeletal Health, Department of Internal Medicine, University of California Davis Medical Center, Sacramento, CA, USA
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20
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Abstract
Nuclear receptors are a family of transcription factors that can be activated by lipophilic ligands. They are fundamental regulators of development, reproduction, and energy metabolism. In bone, nuclear receptors enable bone cells, including osteoblasts, osteoclasts, and osteocytes, to sense their dynamic microenvironment and maintain normal bone development and remodeling. Our views of the molecular mechanisms in this process have advanced greatly in the past decade. Drugs targeting nuclear receptors are widely used in the clinic for treating patients with bone disorders such as osteoporosis by modulating bone formation and resorption rates. Deficiency in the natural ligands of certain nuclear receptors can cause bone loss; for example, estrogen loss in postmenopausal women leads to osteoporosis and increases bone fracture risk. In contrast, excessive ligands of other nuclear receptors, such as glucocorticoids, can also be detrimental to bone health. Nonetheless, the ligand-induced osteoprotective effects of many other nuclear receptors, e.g., vitamin D receptor, are still in debate and require further characterizations. This review summarizes previous studies on the roles of nuclear receptors in bone homeostasis and incorporates the most recent findings. The advancement of our understanding in this field will help researchers improve the applications of agonists, antagonists, and selective modulators of nuclear receptors for therapeutic purposes; in particular, determining optimal pharmacological drug doses, preventing side effects, and designing new drugs that are more potent and specific.
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Almeida M, Laurent MR, Dubois V, Claessens F, O'Brien CA, Bouillon R, Vanderschueren D, Manolagas SC. Estrogens and Androgens in Skeletal Physiology and Pathophysiology. Physiol Rev 2017. [PMID: 27807202 DOI: 10.1152/physrev.00033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023] Open
Abstract
Estrogens and androgens influence the growth and maintenance of the mammalian skeleton and are responsible for its sexual dimorphism. Estrogen deficiency at menopause or loss of both estrogens and androgens in elderly men contribute to the development of osteoporosis, one of the most common and impactful metabolic diseases of old age. In the last 20 years, basic and clinical research advances, genetic insights from humans and rodents, and newer imaging technologies have changed considerably the landscape of our understanding of bone biology as well as the relationship between sex steroids and the physiology and pathophysiology of bone metabolism. Together with the appreciation of the side effects of estrogen-related therapies on breast cancer and cardiovascular diseases, these advances have also drastically altered the treatment of osteoporosis. In this article, we provide a comprehensive review of the molecular and cellular mechanisms of action of estrogens and androgens on bone, their influences on skeletal homeostasis during growth and adulthood, the pathogenetic mechanisms of the adverse effects of their deficiency on the female and male skeleton, as well as the role of natural and synthetic estrogenic or androgenic compounds in the pharmacotherapy of osteoporosis. We highlight latest advances on the crosstalk between hormonal and mechanical signals, the relevance of the antioxidant properties of estrogens and androgens, the difference of their cellular targets in different bone envelopes, the role of estrogen deficiency in male osteoporosis, and the contribution of estrogen or androgen deficiency to the monomorphic effects of aging on skeletal involution.
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Affiliation(s)
- Maria Almeida
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Michaël R Laurent
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Vanessa Dubois
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Frank Claessens
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Charles A O'Brien
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Roger Bouillon
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Dirk Vanderschueren
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Stavros C Manolagas
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
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22
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Almeida M, Laurent MR, Dubois V, Claessens F, O'Brien CA, Bouillon R, Vanderschueren D, Manolagas SC. Estrogens and Androgens in Skeletal Physiology and Pathophysiology. Physiol Rev 2017; 97:135-187. [PMID: 27807202 PMCID: PMC5539371 DOI: 10.1152/physrev.00033.2015] [Citation(s) in RCA: 445] [Impact Index Per Article: 63.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Estrogens and androgens influence the growth and maintenance of the mammalian skeleton and are responsible for its sexual dimorphism. Estrogen deficiency at menopause or loss of both estrogens and androgens in elderly men contribute to the development of osteoporosis, one of the most common and impactful metabolic diseases of old age. In the last 20 years, basic and clinical research advances, genetic insights from humans and rodents, and newer imaging technologies have changed considerably the landscape of our understanding of bone biology as well as the relationship between sex steroids and the physiology and pathophysiology of bone metabolism. Together with the appreciation of the side effects of estrogen-related therapies on breast cancer and cardiovascular diseases, these advances have also drastically altered the treatment of osteoporosis. In this article, we provide a comprehensive review of the molecular and cellular mechanisms of action of estrogens and androgens on bone, their influences on skeletal homeostasis during growth and adulthood, the pathogenetic mechanisms of the adverse effects of their deficiency on the female and male skeleton, as well as the role of natural and synthetic estrogenic or androgenic compounds in the pharmacotherapy of osteoporosis. We highlight latest advances on the crosstalk between hormonal and mechanical signals, the relevance of the antioxidant properties of estrogens and androgens, the difference of their cellular targets in different bone envelopes, the role of estrogen deficiency in male osteoporosis, and the contribution of estrogen or androgen deficiency to the monomorphic effects of aging on skeletal involution.
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Affiliation(s)
- Maria Almeida
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Michaël R Laurent
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Vanessa Dubois
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Frank Claessens
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Charles A O'Brien
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Roger Bouillon
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Dirk Vanderschueren
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Stavros C Manolagas
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
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23
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Eriksson AL, Wilhelmson AS, Fagman JB, Ryberg H, Koskela A, Tuukkanen J, Tivesten Å, Ohlsson C. The Bone Sparing Effects of 2-Methoxyestradiol Are Mediated via Estrogen Receptor-α in Male Mice. Endocrinology 2016; 157:4200-4205. [PMID: 27631553 PMCID: PMC5086527 DOI: 10.1210/en.2016-1402] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
2-Methoxyestradiol (2ME2), a metabolite of 17β-estradiol (E2), exerts bone sparing effects in animal models. We hypothesized that the underlying mechanism is back conversion of 2ME2 to E2, which subsequently acts via estrogen receptor (ER)α. We measured serum E2 levels in orchidectomized wild-type (WT) mice treated with 2ME2 66.6 μg/d or placebo. In placebo-treated animals, E2 was below the detection limit. In 2ME2-treated mice, the serum E2 level was 4.97 ± 0.68 pg/mL. This corresponds to the level found in diesterus in cycling female mice. Next, we investigated bone parameters in orchidectomized WT and ERα knockout mice treated with 2ME2 or placebo for 35 days. 2ME2 (6.66 μg/d) preserved trabecular and cortical bone in WT mice. Trabecular volumetric-bone mineral density was 64 ± 20%, and trabecular bone volume/total volume was 60 ± 20% higher in the metaphyseal region of the femur in the 2ME2 group, compared with placebo (P < .01). Both trabecular number and trabecular thickness were increased (P < .01). Cortical bone mineral content in the diaphyseal region of the femur was 31 ± 3% higher in the 2ME2 group, compared with placebo (P < .001). This was due to larger cortical area (P < .001). Three-point bending showed an increased bone strength in WT 2ME2-treated animals compared with placebo (maximum load [Fmax] +19±5% in the 2ME2 group, P < .05). Importantly, no bone parameter was affected by 2ME2 treatment in ERα knockout mice. In conclusion, 2ME2 treatment of orchidectomized mice results in increased serum E2. ERα mediates the bone sparing effects of 2ME2. The likely mediator of this effect is E2 resulting from back conversion of 2ME2.
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Affiliation(s)
- Anna L Eriksson
- Center for Bone and Arthritis Research (A.L.E., H.R., C.O.), Department of Internal Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Wallenberg Laboratory for Cardiovascular and Metabolic Research (A.S.W., A.T.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Sahlgrenska Cancer Center (J.F.), Department of Surgery, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE-413 45 Gothenburg, Sweden; and Unit of Cancer Research and Translational Medicine (A.K., J.T.), Medical Research Center, Oulu and Department of Anatomy and Cell Biology, University of Oulu, FI-900 14 Oulu, Finland
| | - Anna S Wilhelmson
- Center for Bone and Arthritis Research (A.L.E., H.R., C.O.), Department of Internal Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Wallenberg Laboratory for Cardiovascular and Metabolic Research (A.S.W., A.T.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Sahlgrenska Cancer Center (J.F.), Department of Surgery, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE-413 45 Gothenburg, Sweden; and Unit of Cancer Research and Translational Medicine (A.K., J.T.), Medical Research Center, Oulu and Department of Anatomy and Cell Biology, University of Oulu, FI-900 14 Oulu, Finland
| | - Johan B Fagman
- Center for Bone and Arthritis Research (A.L.E., H.R., C.O.), Department of Internal Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Wallenberg Laboratory for Cardiovascular and Metabolic Research (A.S.W., A.T.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Sahlgrenska Cancer Center (J.F.), Department of Surgery, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE-413 45 Gothenburg, Sweden; and Unit of Cancer Research and Translational Medicine (A.K., J.T.), Medical Research Center, Oulu and Department of Anatomy and Cell Biology, University of Oulu, FI-900 14 Oulu, Finland
| | - Henrik Ryberg
- Center for Bone and Arthritis Research (A.L.E., H.R., C.O.), Department of Internal Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Wallenberg Laboratory for Cardiovascular and Metabolic Research (A.S.W., A.T.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Sahlgrenska Cancer Center (J.F.), Department of Surgery, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE-413 45 Gothenburg, Sweden; and Unit of Cancer Research and Translational Medicine (A.K., J.T.), Medical Research Center, Oulu and Department of Anatomy and Cell Biology, University of Oulu, FI-900 14 Oulu, Finland
| | - Antti Koskela
- Center for Bone and Arthritis Research (A.L.E., H.R., C.O.), Department of Internal Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Wallenberg Laboratory for Cardiovascular and Metabolic Research (A.S.W., A.T.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Sahlgrenska Cancer Center (J.F.), Department of Surgery, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE-413 45 Gothenburg, Sweden; and Unit of Cancer Research and Translational Medicine (A.K., J.T.), Medical Research Center, Oulu and Department of Anatomy and Cell Biology, University of Oulu, FI-900 14 Oulu, Finland
| | - Juha Tuukkanen
- Center for Bone and Arthritis Research (A.L.E., H.R., C.O.), Department of Internal Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Wallenberg Laboratory for Cardiovascular and Metabolic Research (A.S.W., A.T.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Sahlgrenska Cancer Center (J.F.), Department of Surgery, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE-413 45 Gothenburg, Sweden; and Unit of Cancer Research and Translational Medicine (A.K., J.T.), Medical Research Center, Oulu and Department of Anatomy and Cell Biology, University of Oulu, FI-900 14 Oulu, Finland
| | - Åsa Tivesten
- Center for Bone and Arthritis Research (A.L.E., H.R., C.O.), Department of Internal Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Wallenberg Laboratory for Cardiovascular and Metabolic Research (A.S.W., A.T.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Sahlgrenska Cancer Center (J.F.), Department of Surgery, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE-413 45 Gothenburg, Sweden; and Unit of Cancer Research and Translational Medicine (A.K., J.T.), Medical Research Center, Oulu and Department of Anatomy and Cell Biology, University of Oulu, FI-900 14 Oulu, Finland
| | - Claes Ohlsson
- Center for Bone and Arthritis Research (A.L.E., H.R., C.O.), Department of Internal Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Wallenberg Laboratory for Cardiovascular and Metabolic Research (A.S.W., A.T.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Sahlgrenska Cancer Center (J.F.), Department of Surgery, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, SE-413 45 Gothenburg, Sweden; Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE-413 45 Gothenburg, Sweden; and Unit of Cancer Research and Translational Medicine (A.K., J.T.), Medical Research Center, Oulu and Department of Anatomy and Cell Biology, University of Oulu, FI-900 14 Oulu, Finland
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24
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Farman HH, Windahl SH, Westberg L, Isaksson H, Egecioglu E, Schele E, Ryberg H, Jansson JO, Tuukkanen J, Koskela A, Xie SK, Hahner L, Zehr J, Clegg DJ, Lagerquist MK, Ohlsson C. Female Mice Lacking Estrogen Receptor-α in Hypothalamic Proopiomelanocortin (POMC) Neurons Display Enhanced Estrogenic Response on Cortical Bone Mass. Endocrinology 2016; 157:3242-52. [PMID: 27254004 PMCID: PMC4967117 DOI: 10.1210/en.2016-1181] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Estrogens are important regulators of bone mass and their effects are mainly mediated via estrogen receptor (ER)α. Central ERα exerts an inhibitory role on bone mass. ERα is highly expressed in the arcuate (ARC) and the ventromedial (VMN) nuclei in the hypothalamus. To test whether ERα in proopiomelanocortin (POMC) neurons, located in ARC, is involved in the regulation of bone mass, we used mice lacking ERα expression specifically in POMC neurons (POMC-ERα(-/-)). Female POMC-ERα(-/-) and control mice were ovariectomized (OVX) and treated with vehicle or estradiol (0.5 μg/d) for 6 weeks. As expected, estradiol treatment increased the cortical bone thickness in femur, the cortical bone mechanical strength in tibia and the trabecular bone volume fraction in both femur and vertebrae in OVX control mice. Importantly, the estrogenic responses were substantially increased in OVX POMC-ERα(-/-) mice compared with the estrogenic responses in OVX control mice for cortical bone thickness (+126 ± 34%, P < .01) and mechanical strength (+193 ± 38%, P < .01). To test whether ERα in VMN is involved in the regulation of bone mass, ERα was silenced using an adeno-associated viral vector. Silencing of ERα in hypothalamic VMN resulted in unchanged bone mass. In conclusion, mice lacking ERα in POMC neurons display enhanced estrogenic response on cortical bone mass and mechanical strength. We propose that the balance between inhibitory effects of central ERα activity in hypothalamic POMC neurons in ARC and stimulatory peripheral ERα-mediated effects in bone determines cortical bone mass in female mice.
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Affiliation(s)
- H H Farman
- Centre for Bone and Arthritis Research (H.H.F., S.H.W., H.R., M.K.L., C.O.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE413 45 Gothenburg, Sweden; Department of Pharmacology (L.W., E.E.), Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Biomedical Engineering (H.I.), Lund University, SE221 85 Lund, Sweden; Department of Orthopaedics (H.I.), Clinical Sciences, Lund University, SE221 85 Lund, Sweden; Institute of Neuroscience and Physiology/Endocrinology (E.S., J.O.J.), Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE413 45 Gothenburg, Sweden; Department of Anatomy and Cell Biology (J.T., A.K.), Institute of Cancer Research and Translational Medicine, Medical Research Center, University of Oulu, FI900 14 Oulu, Finland; and Touchstone Diabetes Center (S.K.X., L.H., J.Z., D.J.C.), Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - S H Windahl
- Centre for Bone and Arthritis Research (H.H.F., S.H.W., H.R., M.K.L., C.O.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE413 45 Gothenburg, Sweden; Department of Pharmacology (L.W., E.E.), Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Biomedical Engineering (H.I.), Lund University, SE221 85 Lund, Sweden; Department of Orthopaedics (H.I.), Clinical Sciences, Lund University, SE221 85 Lund, Sweden; Institute of Neuroscience and Physiology/Endocrinology (E.S., J.O.J.), Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE413 45 Gothenburg, Sweden; Department of Anatomy and Cell Biology (J.T., A.K.), Institute of Cancer Research and Translational Medicine, Medical Research Center, University of Oulu, FI900 14 Oulu, Finland; and Touchstone Diabetes Center (S.K.X., L.H., J.Z., D.J.C.), Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - L Westberg
- Centre for Bone and Arthritis Research (H.H.F., S.H.W., H.R., M.K.L., C.O.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE413 45 Gothenburg, Sweden; Department of Pharmacology (L.W., E.E.), Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Biomedical Engineering (H.I.), Lund University, SE221 85 Lund, Sweden; Department of Orthopaedics (H.I.), Clinical Sciences, Lund University, SE221 85 Lund, Sweden; Institute of Neuroscience and Physiology/Endocrinology (E.S., J.O.J.), Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE413 45 Gothenburg, Sweden; Department of Anatomy and Cell Biology (J.T., A.K.), Institute of Cancer Research and Translational Medicine, Medical Research Center, University of Oulu, FI900 14 Oulu, Finland; and Touchstone Diabetes Center (S.K.X., L.H., J.Z., D.J.C.), Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - H Isaksson
- Centre for Bone and Arthritis Research (H.H.F., S.H.W., H.R., M.K.L., C.O.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE413 45 Gothenburg, Sweden; Department of Pharmacology (L.W., E.E.), Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Biomedical Engineering (H.I.), Lund University, SE221 85 Lund, Sweden; Department of Orthopaedics (H.I.), Clinical Sciences, Lund University, SE221 85 Lund, Sweden; Institute of Neuroscience and Physiology/Endocrinology (E.S., J.O.J.), Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE413 45 Gothenburg, Sweden; Department of Anatomy and Cell Biology (J.T., A.K.), Institute of Cancer Research and Translational Medicine, Medical Research Center, University of Oulu, FI900 14 Oulu, Finland; and Touchstone Diabetes Center (S.K.X., L.H., J.Z., D.J.C.), Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - E Egecioglu
- Centre for Bone and Arthritis Research (H.H.F., S.H.W., H.R., M.K.L., C.O.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE413 45 Gothenburg, Sweden; Department of Pharmacology (L.W., E.E.), Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Biomedical Engineering (H.I.), Lund University, SE221 85 Lund, Sweden; Department of Orthopaedics (H.I.), Clinical Sciences, Lund University, SE221 85 Lund, Sweden; Institute of Neuroscience and Physiology/Endocrinology (E.S., J.O.J.), Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE413 45 Gothenburg, Sweden; Department of Anatomy and Cell Biology (J.T., A.K.), Institute of Cancer Research and Translational Medicine, Medical Research Center, University of Oulu, FI900 14 Oulu, Finland; and Touchstone Diabetes Center (S.K.X., L.H., J.Z., D.J.C.), Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - E Schele
- Centre for Bone and Arthritis Research (H.H.F., S.H.W., H.R., M.K.L., C.O.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE413 45 Gothenburg, Sweden; Department of Pharmacology (L.W., E.E.), Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Biomedical Engineering (H.I.), Lund University, SE221 85 Lund, Sweden; Department of Orthopaedics (H.I.), Clinical Sciences, Lund University, SE221 85 Lund, Sweden; Institute of Neuroscience and Physiology/Endocrinology (E.S., J.O.J.), Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE413 45 Gothenburg, Sweden; Department of Anatomy and Cell Biology (J.T., A.K.), Institute of Cancer Research and Translational Medicine, Medical Research Center, University of Oulu, FI900 14 Oulu, Finland; and Touchstone Diabetes Center (S.K.X., L.H., J.Z., D.J.C.), Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - H Ryberg
- Centre for Bone and Arthritis Research (H.H.F., S.H.W., H.R., M.K.L., C.O.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE413 45 Gothenburg, Sweden; Department of Pharmacology (L.W., E.E.), Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Biomedical Engineering (H.I.), Lund University, SE221 85 Lund, Sweden; Department of Orthopaedics (H.I.), Clinical Sciences, Lund University, SE221 85 Lund, Sweden; Institute of Neuroscience and Physiology/Endocrinology (E.S., J.O.J.), Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE413 45 Gothenburg, Sweden; Department of Anatomy and Cell Biology (J.T., A.K.), Institute of Cancer Research and Translational Medicine, Medical Research Center, University of Oulu, FI900 14 Oulu, Finland; and Touchstone Diabetes Center (S.K.X., L.H., J.Z., D.J.C.), Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - J O Jansson
- Centre for Bone and Arthritis Research (H.H.F., S.H.W., H.R., M.K.L., C.O.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE413 45 Gothenburg, Sweden; Department of Pharmacology (L.W., E.E.), Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Biomedical Engineering (H.I.), Lund University, SE221 85 Lund, Sweden; Department of Orthopaedics (H.I.), Clinical Sciences, Lund University, SE221 85 Lund, Sweden; Institute of Neuroscience and Physiology/Endocrinology (E.S., J.O.J.), Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE413 45 Gothenburg, Sweden; Department of Anatomy and Cell Biology (J.T., A.K.), Institute of Cancer Research and Translational Medicine, Medical Research Center, University of Oulu, FI900 14 Oulu, Finland; and Touchstone Diabetes Center (S.K.X., L.H., J.Z., D.J.C.), Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - J Tuukkanen
- Centre for Bone and Arthritis Research (H.H.F., S.H.W., H.R., M.K.L., C.O.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE413 45 Gothenburg, Sweden; Department of Pharmacology (L.W., E.E.), Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Biomedical Engineering (H.I.), Lund University, SE221 85 Lund, Sweden; Department of Orthopaedics (H.I.), Clinical Sciences, Lund University, SE221 85 Lund, Sweden; Institute of Neuroscience and Physiology/Endocrinology (E.S., J.O.J.), Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE413 45 Gothenburg, Sweden; Department of Anatomy and Cell Biology (J.T., A.K.), Institute of Cancer Research and Translational Medicine, Medical Research Center, University of Oulu, FI900 14 Oulu, Finland; and Touchstone Diabetes Center (S.K.X., L.H., J.Z., D.J.C.), Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - A Koskela
- Centre for Bone and Arthritis Research (H.H.F., S.H.W., H.R., M.K.L., C.O.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE413 45 Gothenburg, Sweden; Department of Pharmacology (L.W., E.E.), Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Biomedical Engineering (H.I.), Lund University, SE221 85 Lund, Sweden; Department of Orthopaedics (H.I.), Clinical Sciences, Lund University, SE221 85 Lund, Sweden; Institute of Neuroscience and Physiology/Endocrinology (E.S., J.O.J.), Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE413 45 Gothenburg, Sweden; Department of Anatomy and Cell Biology (J.T., A.K.), Institute of Cancer Research and Translational Medicine, Medical Research Center, University of Oulu, FI900 14 Oulu, Finland; and Touchstone Diabetes Center (S.K.X., L.H., J.Z., D.J.C.), Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - S K Xie
- Centre for Bone and Arthritis Research (H.H.F., S.H.W., H.R., M.K.L., C.O.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE413 45 Gothenburg, Sweden; Department of Pharmacology (L.W., E.E.), Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Biomedical Engineering (H.I.), Lund University, SE221 85 Lund, Sweden; Department of Orthopaedics (H.I.), Clinical Sciences, Lund University, SE221 85 Lund, Sweden; Institute of Neuroscience and Physiology/Endocrinology (E.S., J.O.J.), Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE413 45 Gothenburg, Sweden; Department of Anatomy and Cell Biology (J.T., A.K.), Institute of Cancer Research and Translational Medicine, Medical Research Center, University of Oulu, FI900 14 Oulu, Finland; and Touchstone Diabetes Center (S.K.X., L.H., J.Z., D.J.C.), Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - L Hahner
- Centre for Bone and Arthritis Research (H.H.F., S.H.W., H.R., M.K.L., C.O.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE413 45 Gothenburg, Sweden; Department of Pharmacology (L.W., E.E.), Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Biomedical Engineering (H.I.), Lund University, SE221 85 Lund, Sweden; Department of Orthopaedics (H.I.), Clinical Sciences, Lund University, SE221 85 Lund, Sweden; Institute of Neuroscience and Physiology/Endocrinology (E.S., J.O.J.), Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE413 45 Gothenburg, Sweden; Department of Anatomy and Cell Biology (J.T., A.K.), Institute of Cancer Research and Translational Medicine, Medical Research Center, University of Oulu, FI900 14 Oulu, Finland; and Touchstone Diabetes Center (S.K.X., L.H., J.Z., D.J.C.), Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - J Zehr
- Centre for Bone and Arthritis Research (H.H.F., S.H.W., H.R., M.K.L., C.O.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE413 45 Gothenburg, Sweden; Department of Pharmacology (L.W., E.E.), Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Biomedical Engineering (H.I.), Lund University, SE221 85 Lund, Sweden; Department of Orthopaedics (H.I.), Clinical Sciences, Lund University, SE221 85 Lund, Sweden; Institute of Neuroscience and Physiology/Endocrinology (E.S., J.O.J.), Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE413 45 Gothenburg, Sweden; Department of Anatomy and Cell Biology (J.T., A.K.), Institute of Cancer Research and Translational Medicine, Medical Research Center, University of Oulu, FI900 14 Oulu, Finland; and Touchstone Diabetes Center (S.K.X., L.H., J.Z., D.J.C.), Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - D J Clegg
- Centre for Bone and Arthritis Research (H.H.F., S.H.W., H.R., M.K.L., C.O.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE413 45 Gothenburg, Sweden; Department of Pharmacology (L.W., E.E.), Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Biomedical Engineering (H.I.), Lund University, SE221 85 Lund, Sweden; Department of Orthopaedics (H.I.), Clinical Sciences, Lund University, SE221 85 Lund, Sweden; Institute of Neuroscience and Physiology/Endocrinology (E.S., J.O.J.), Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE413 45 Gothenburg, Sweden; Department of Anatomy and Cell Biology (J.T., A.K.), Institute of Cancer Research and Translational Medicine, Medical Research Center, University of Oulu, FI900 14 Oulu, Finland; and Touchstone Diabetes Center (S.K.X., L.H., J.Z., D.J.C.), Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - M K Lagerquist
- Centre for Bone and Arthritis Research (H.H.F., S.H.W., H.R., M.K.L., C.O.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE413 45 Gothenburg, Sweden; Department of Pharmacology (L.W., E.E.), Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Biomedical Engineering (H.I.), Lund University, SE221 85 Lund, Sweden; Department of Orthopaedics (H.I.), Clinical Sciences, Lund University, SE221 85 Lund, Sweden; Institute of Neuroscience and Physiology/Endocrinology (E.S., J.O.J.), Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE413 45 Gothenburg, Sweden; Department of Anatomy and Cell Biology (J.T., A.K.), Institute of Cancer Research and Translational Medicine, Medical Research Center, University of Oulu, FI900 14 Oulu, Finland; and Touchstone Diabetes Center (S.K.X., L.H., J.Z., D.J.C.), Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - C Ohlsson
- Centre for Bone and Arthritis Research (H.H.F., S.H.W., H.R., M.K.L., C.O.), Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, SE413 45 Gothenburg, Sweden; Department of Pharmacology (L.W., E.E.), Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Biomedical Engineering (H.I.), Lund University, SE221 85 Lund, Sweden; Department of Orthopaedics (H.I.), Clinical Sciences, Lund University, SE221 85 Lund, Sweden; Institute of Neuroscience and Physiology/Endocrinology (E.S., J.O.J.), Sahlgrenska Academy, University of Gothenburg, SE405 30 Gothenburg, Sweden; Department of Clinical Chemistry (H.R.), Sahlgrenska University Hospital, SE413 45 Gothenburg, Sweden; Department of Anatomy and Cell Biology (J.T., A.K.), Institute of Cancer Research and Translational Medicine, Medical Research Center, University of Oulu, FI900 14 Oulu, Finland; and Touchstone Diabetes Center (S.K.X., L.H., J.Z., D.J.C.), Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390
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25
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The role of membrane ERα signaling in bone and other major estrogen responsive tissues. Sci Rep 2016; 6:29473. [PMID: 27388455 PMCID: PMC4937452 DOI: 10.1038/srep29473] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Accepted: 06/20/2016] [Indexed: 12/03/2022] Open
Abstract
Estrogen receptor α (ERα) signaling leads to cellular responses in several tissues and in addition to nuclear ERα-mediated effects, membrane ERα (mERα) signaling may be of importance. To elucidate the significance, in vivo, of mERα signaling in multiple estrogen-responsive tissues, we have used female mice lacking the ability to localize ERα to the membrane due to a point mutation in the palmitoylation site (C451A), so called Nuclear-Only-ER (NOER) mice. Interestingly, the role of mERα signaling for the estrogen response was highly tissue-dependent, with trabecular bone in the axial skeleton being strongly dependent (>80% reduction in estrogen response in NOER mice), cortical and trabecular bone in long bones, as well as uterus and thymus being partly dependent (40–70% reduction in estrogen response in NOER mice) and effects on liver weight and total body fat mass being essentially independent of mERα (<35% reduction in estrogen response in NOER mice). In conclusion, mERα signaling is important for the estrogenic response in female mice in a tissue-dependent manner. Increased knowledge regarding membrane initiated ERα actions may provide means to develop new selective estrogen receptor modulators with improved profiles.
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Marcon M, Keller D, Wurnig MC, Eberhardt C, Weiger M, Eberli D, Boss A. Separation of collagen-bound and porous bone water transverse relaxation in mice: proposal of a multi-step approach. NMR IN BIOMEDICINE 2016; 29:866-872. [PMID: 27116654 DOI: 10.1002/nbm.3533] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2016] [Revised: 02/15/2016] [Accepted: 03/12/2016] [Indexed: 06/05/2023]
Abstract
The separation and quantification of collagen-bound water (CBW) and pore water (PW) components of the cortical bone signal are important because of their different contribution to bone mechanical properties. Ultrashort TE (UTE) imaging can be used to exploit the transverse relaxation from CBW and PW, allowing their quantification. We tested, for the first time, the feasibility of UTE measurements in mice for the separation and quantification of the transverse relaxation of CBW and PW in vivo using three different approaches for T2 * determination. UTE sequences were acquired at 4.7 T in six mice with 10 different TEs (50-5000 μs). The transverse relaxation time T2 * of CBW (T2 *cbw ) and PW (T2 *pw ) and the CBW fraction (bwf) were computed using a mono-exponential (i), a standard bi-exponential (ii) and a new multi-step bi-exponential (iii) approach. Regions of interest were drawn at multiple levels of the femur and vertebral body cortical bone for each mouse. The sum of the normalized squared residuals (Res) and the homogeneity of variance were tested to compare the different methods. In the femur, approach (i) yielded mean T2 * ± standard deviation (SD) of 657 ± 234 μs. With approach (ii), T2 *cbw , T2 *pw and bwf were 464 ± 153 μs, 15 777 ± 10 864 μs and 57.6 ± 9.9%, respectively. For approach (iii), T2 *cbw , T2 *pw and bwf were 387 ± 108 μs, 7534 ± 2765 μs and 42.5 ± 6.2%, respectively. Similar values were obtained from vertebral bodies. Res with approach (ii) was lower than with the two other approaches (p < 0.007), but T2 *pw and bwf variance was lower with approach (iii) than with approach (ii) (p < 0.048). We demonstrated that the separation and quantification of cortical bone water components with UTE sequences is feasible in vivo in mouse models. The direct bi-exponential approach exhibited the best approximation to the measured signal curve with the lowest residuals; however, the newly proposed multi-step algorithm resulted in substantially lower variability of the computed parameters. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Magda Marcon
- Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Zurich, Switzerland
| | - Daniel Keller
- Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Zurich, Switzerland
- Department of Urology, University Hospital Zurich, Zurich, Switzerland
| | - Moritz C Wurnig
- Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Zurich, Switzerland
| | - Christian Eberhardt
- Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Zurich, Switzerland
| | - Markus Weiger
- Institute for Biomedical Engineering, University of Zurich and Swiss Federal Institute for Technology, Zurich, Switzerland
| | - Daniel Eberli
- Department of Urology, University Hospital Zurich, Zurich, Switzerland
| | - Andreas Boss
- Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Zurich, Switzerland
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Kalder M, Kyvernitakis I, Hars O, Kauka A, Hadji P. Comparison of combined low-dose hormone therapy vs. tibolone in the prevention of bone loss. Climacteric 2016; 19:471-7. [PMID: 27345158 DOI: 10.1080/13697137.2016.1198313] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
OBJECTIVES To compare the effects on bone mineral density (BMD) measured by dual-energy X-ray absorptiometry at the lumbar spine, the femoral neck and the total hip following 2 years of treatment with a low-dose combined hormone therapy (HT) comprised of 1 mg estradiol and 0.5 mg norethisterone acetate (E2/NETA) versus 2.5 mg tibolone in postmenopausal women. Additionally, quantitative ultrasonometry (QUS) of the os calcaneus and of the phalanges was performed. METHODS Changes in BMD, QUS and side-effects were assessed at baseline, 6, 12 and 24 months in 50 postmenopausal women who received either E2/NETA (n = 26) or tibolone (n = 24) for 2 years. RESULTS Compared to women on tibolone, women receiving E2/NETA showed a significant increase in BMD from baseline to 12 and 24 months at the lumbar spine (3.07%, 3.86%; p < 0.01 vs. 1.13%, 2.23%; p < 0.05), and at the total hip (1.33%, 1.69%; p < 0.01 vs. 0.76%, 0.70%) and at the femoral neck from baseline to 24 months (1.10%; p < 0.05). QUS indices only showed a significant change with the ultrasound bone profile index with E2/NETA at 6 months (-2.32%; p < 0.001). CONCLUSIONS Low-dose E2/NETA showed a significantly higher increase in BMD compared to tibolone. QUS measurement was not considered to comprise beneficial effects in monitoring drug-induced bone changes.
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Affiliation(s)
- M Kalder
- a Department of Obstetrics and Gynecology , Philipps University of Marburg , Germany
| | - I Kyvernitakis
- a Department of Obstetrics and Gynecology , Philipps University of Marburg , Germany
| | - O Hars
- b Statistical Institute , Berlin , Germany
| | - A Kauka
- a Department of Obstetrics and Gynecology , Philipps University of Marburg , Germany
| | - P Hadji
- c Department of Bone Oncology, Endocrinology and Reproductive Medicine , Nordwest Hospital , Frankfurt , Germany
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28
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Abstract
Estrogens are important for bone metabolism via a variety of mechanisms in osteoblasts, osteocytes, osteoclasts, immune cells and other cells to maintain bone mineral density. Estrogens bind to estrogen receptor alpha (ERα) and ERβ, and the roles of each of these receptors are beginning to be elucidated through whole body and tissue-specific knockouts of the receptors. In vitro and in vivo experiments have shown that ERα and ERβ antagonize each other in bone and in other tissues. This review will highlight the role of these receptors in bone, with particular emphasis on their antagonism.
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Affiliation(s)
- Aysha B Khalid
- Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Susan A Krum
- Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, TN, United States.
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29
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Börjesson AE, Farman HH, Movérare-Skrtic S, Engdahl C, Antal MC, Koskela A, Tuukkanen J, Carlsten H, Krust A, Chambon P, Sjögren K, Lagerquist MK, Windahl SH, Ohlsson C. SERMs have substance-specific effects on bone, and these effects are mediated via ERαAF-1 in female mice. Am J Physiol Endocrinol Metab 2016; 310:E912-8. [PMID: 27048997 PMCID: PMC4935145 DOI: 10.1152/ajpendo.00488.2015] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Accepted: 04/01/2016] [Indexed: 11/22/2022]
Abstract
The bone-sparing effect of estrogens is mediated primarily via estrogen receptor (ER)α, which stimulates gene transcription through activation function (AF)-1 and AF-2. The role of ERαAF-1 for the estradiol (E2) effects is tissue specific. The selective ER modulators (SERMs) raloxifene (Ral), lasofoxifene (Las), and bazedoxifene (Bza) can be used to treat postmenopausal osteoporosis. They all reduce the risk for vertebral fractures, whereas Las and partly Bza, but not Ral, reduce the risk for nonvertebral fractures. Here, we have compared the tissue specificity of Ral, Las, and Bza and evaluated the role of ERαAF-1 for the effects of these SERMs, with an emphasis on bone parameters. We treated ovariectomized (OVX) wild-type (WT) mice and OVX mice lacking ERαAF-1 (ERαAF-1(0)) with E2, Ral, Las, or Bza. All three SERMs increased trabecular bone mass in the axial skeleton. In the appendicular skeleton, only Las increased the trabecular bone volume/tissue volume and trabecular number, whereas both Ral and Las increased the cortical bone thickness and strength. However, Ral also increased cortical porosity. The three SERMs had only a minor effect on uterine weight. Notably, all evaluated effects of these SERMs were absent in ovx ERαAF-1(0) mice. In conclusion, all SERMs had similar effects on axial bone mass. However, the SERMs had slightly different effects on the appendicular skeleton since only Las increased the trabecular bone mass and only Ral increased the cortical porosity. Importantly, all SERM effects require a functional ERαAF-1 in female mice. These results could lead to development of more specific treatments for osteoporosis.
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Affiliation(s)
- Anna E Börjesson
- Rheumatology and Bone Diseases Unit, Centre for Genomic and Experimental Medicine, MRC Institute of Genetics and Molecular Medicine, Western General Hospital, University of Edinburgh, Edinburgh, United Kingdom
| | - Helen H Farman
- Centre for Bone and Arthritis Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Sofia Movérare-Skrtic
- Centre for Bone and Arthritis Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Cecilia Engdahl
- Centre for Bone and Arthritis Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Maria Cristina Antal
- Strasbourg University, Faculté de Médecine, Institut d'Histologie, Strasbourg, France
| | - Antti Koskela
- Department of Anatomy and Cell Biology, MRC Oulu, University of Oulu, Oulu, Finland
| | - Juha Tuukkanen
- Department of Anatomy and Cell Biology, MRC Oulu, University of Oulu, Oulu, Finland
| | - Hans Carlsten
- Centre for Bone and Arthritis Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Andrée Krust
- Institut de Génétique et de Biologie Moléculaire et Cellulaire (Centre National de la Recherche Scientifique UMR7104; National de la Sante et de la Recherche Medicale U596; ULP, Collège de France), Illkirch, Strasbourg, France
| | - Pierre Chambon
- Institut de Génétique et de Biologie Moléculaire et Cellulaire (Centre National de la Recherche Scientifique UMR7104; National de la Sante et de la Recherche Medicale U596; ULP, Collège de France), Illkirch, Strasbourg, France
| | - Klara Sjögren
- Centre for Bone and Arthritis Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Marie K Lagerquist
- Centre for Bone and Arthritis Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Sara H Windahl
- Centre for Bone and Arthritis Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Claes Ohlsson
- Centre for Bone and Arthritis Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden;
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