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Baschant U, Fuqua BK, Ledesma-Colunga M, Vulpe CD, McLachlan S, Hofbauer LC, Lusis AJ, Rauner M. Effects of dietary iron deficiency or overload on bone: Dietary details matter. Bone 2024; 184:117092. [PMID: 38575048 DOI: 10.1016/j.bone.2024.117092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Revised: 03/28/2024] [Accepted: 03/31/2024] [Indexed: 04/06/2024]
Abstract
PURPOSE Bone is susceptible to fluctuations in iron homeostasis, as both iron deficiency and overload are linked to poor bone strength in humans. In mice, however, inconsistent results have been reported, likely due to different diet setups or genetic backgrounds. Here, we assessed the effect of different high and low iron diets on bone in six inbred mouse strains (C57BL/6J, A/J, BALB/cJ, AKR/J, C3H/HeJ, and DBA/2J). METHODS Mice received a high (20,000 ppm) or low-iron diet (∼10 ppm) after weaning for 6-8 weeks. For C57BL/6J males, we used two dietary setups with similar amounts of iron, yet different nutritional compositions that were either richer ("TUD study") or poorer ("UCLA study") in minerals and vitamins. After sacrifice, liver, blood and bone parameters as well as bone turnover markers in the serum were analyzed. RESULTS Almost all mice on the UCLA study high iron diet had a significant decrease of cortical and trabecular bone mass accompanied by high bone resorption. Iron deficiency did not change bone microarchitecture or turnover in C57BL/6J, A/J, and DBA/2J mice, but increased trabecular bone mass in BALB/cJ, C3H/HeJ and AKR/J mice. In contrast to the UCLA study, male C57BL/6J mice in the TUD study did not display any changes in trabecular bone mass or turnover on high or low iron diet. However, cortical bone parameters were also decreased in TUD mice on the high iron diet. CONCLUSION Thus, these data show that cortical bone is more susceptible to iron overload than trabecular bone and highlight the importance of a nutrient-rich diet to potentially mitigate the negative effects of iron overload on bone.
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Affiliation(s)
- Ulrike Baschant
- Department of Medicine III & Center for Healthy Aging, Technische Universität Dresden, Germany
| | - Brie K Fuqua
- Department of Medicine, Division of Cardiology, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
| | - Maria Ledesma-Colunga
- Department of Medicine III & Center for Healthy Aging, Technische Universität Dresden, Germany
| | - Christopher D Vulpe
- Department of Physiological Sciences, University of Florida Center for Environmental and Human Toxicology, University of Florida, Gainesville, FL 32611, USA
| | | | - Lorenz C Hofbauer
- Department of Medicine III & Center for Healthy Aging, Technische Universität Dresden, Germany
| | - Aldons J Lusis
- Department of Medicine, Division of Cardiology, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
| | - Martina Rauner
- Department of Medicine III & Center for Healthy Aging, Technische Universität Dresden, Germany.
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Ledesma-Colunga MG, Passin V, Vujic Spasic M, Hofbauer LC, Baschant U, Rauner M. Comparison of the effects of high dietary iron levels on bone microarchitecture responses in the mouse strains 129/Sv and C57BL/6J. Sci Rep 2024; 14:4887. [PMID: 38418857 PMCID: PMC10902348 DOI: 10.1038/s41598-024-55303-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 02/22/2024] [Indexed: 03/02/2024] Open
Abstract
Iron is an essential nutrient for all living organisms. Both iron deficiency and excess can be harmful. Bone, a highly metabolic active organ, is particularly sensitive to fluctuations in iron levels. In this study, we investigated the effects of dietary iron overload on bone homeostasis with a specific focus on two frequently utilized mouse strains: 129/Sv and C57BL/6J. Our findings revealed that after 6 weeks on an iron-rich diet, 129/Sv mice exhibited a decrease in trabecular and cortical bone density in both vertebral and femoral bones, which was linked to reduced bone turnover. In contrast, there was no evidence of bone changes associated with iron overload in age-matched C57BL/6J mice. Interestingly, 129/Sv mice exposed to an iron-rich diet during their prenatal development were protected from iron-induced bone loss, suggesting the presence of potential adaptive mechanisms. Overall, our study underscores the critical role of genetic background in modulating the effects of iron overload on bone health. This should be considered when studying effects of iron on bone.
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Affiliation(s)
- Maria G Ledesma-Colunga
- Department of Medicine III & Center for Healthy Aging, Medical Faculty and University Hospital Carl Gustav Carus, Dresden University of Technology, Dresden, Germany
| | - Vanessa Passin
- Department of Medicine III & Center for Healthy Aging, Medical Faculty and University Hospital Carl Gustav Carus, Dresden University of Technology, Dresden, Germany
| | - Maja Vujic Spasic
- Institute of Comparative Molecular Endocrinology, Ulm University, Ulm, Germany
| | - Lorenz C Hofbauer
- Department of Medicine III & Center for Healthy Aging, Medical Faculty and University Hospital Carl Gustav Carus, Dresden University of Technology, Dresden, Germany
| | - Ulrike Baschant
- Department of Medicine III & Center for Healthy Aging, Medical Faculty and University Hospital Carl Gustav Carus, Dresden University of Technology, Dresden, Germany
| | - Martina Rauner
- Department of Medicine III & Center for Healthy Aging, Medical Faculty and University Hospital Carl Gustav Carus, Dresden University of Technology, Dresden, Germany.
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Robin F, Chappard D, Leroyer P, Latour C, Mabilleau G, Monbet V, Cavey T, Horeau M, Derbré F, Roth MP, Ropert M, Guggenbuhl P, Loréal O. Differences in bone microarchitecture between genetic and secondary iron-overload mouse models suggest a role for hepcidin deficiency in iron-related osteoporosis. FASEB J 2023; 37:e23245. [PMID: 37874260 DOI: 10.1096/fj.202301184r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 09/04/2023] [Accepted: 09/25/2023] [Indexed: 10/25/2023]
Abstract
Iron overload is one of the secondary osteoporosis etiologies. Cellular and molecular mechanisms involved in iron-related osteoporosis are not fully understood. AIM The aim of the study was to investigate the respective roles of iron excess and hepcidin, the systemic iron regulator, in the development of iron-related osteoporosis. MATERIAL AND METHODS We used mice models with genetic iron overload (GIO) related to hepcidin deficiency (Hfe-/- and Bmp6-/- ) and secondary iron overload (SIO) exhibiting a hepcidin increase secondary to iron excess. Iron concentration and transferrin saturation levels were evaluated in serum and hepatic, spleen, and bone iron concentrations were assessed by ICP-MS and Perl's staining. Gene expression was evaluated by quantitative RT-PCR. Bone micro-architecture was evaluated by micro-CT. The osteoblastic MC3T3 murine cells that are able to mineralize were exposed to iron and/or hepcidin. RESULTS Despite an increase of bone iron concentration in all overloaded mice models, bone volume/total volume (BV/TV) and trabecular thickness (Tb.Th) only decreased significantly in GIO, at 12 months for Hfe-/- and from 6 months for Bmp6-/- . Alterations in bone microarchitecture in the Bmp6-/- model were positively correlated with hepcidin levels (BV/TV (ρ = +.481, p < .05) and Tb.Th (ρ = +.690, p < .05). Iron deposits were detected in the bone trabeculae of Hfe-/- and Bmp6-/- mice, while iron deposits were mainly visible in bone marrow macrophages in secondary iron overload. In cell cultures, ferric ammonium citrate exposure abolished the mineralization process for concentrations above 5 μM, with a parallel decrease in osteocalcin, collagen 1, and alkaline phosphatase mRNA levels. Hepcidin supplementation of cells had a rescue effect on the collagen 1 and alkaline phosphatase expression level decrease. CONCLUSION Together, these data suggest that iron in excess alone is not sufficient to induce osteoporosis and that low hepcidin levels also contribute to the development of osteoporosis.
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Affiliation(s)
- François Robin
- INSERM, Univ Rennes, INRAE, CHU Rennes, U 1241, Institut NuMeCan (Nutrition Metabolisms and Cancer), Rennes, France
| | - Daniel Chappard
- GEROM, LHEA, IRIS-IBS Biology Institut, Angers cedex, France
| | - Patricia Leroyer
- INSERM, Univ Rennes, INRAE, CHU Rennes, U 1241, Institut NuMeCan (Nutrition Metabolisms and Cancer), Rennes, France
| | - Chloé Latour
- IRSD, Univ Toulouse, INSERM, INRAE, ENVT, UPS, Toulouse, France
| | - Guillaume Mabilleau
- Univ Angers, Nantes Université, Oniris, Inserm, RMeS, REGOS, SFR ICAT, Angers, France
| | | | - Thibault Cavey
- INSERM, Univ Rennes, INRAE, CHU Rennes, U 1241, Institut NuMeCan (Nutrition Metabolisms and Cancer), Rennes, France
| | - Mathieu Horeau
- INSERM, Univ Rennes, INRAE, CHU Rennes, U 1241, Institut NuMeCan (Nutrition Metabolisms and Cancer), Rennes, France
- Laboratory "Movement Sport and Health Sciences" EA7470, University of Rennes/ENS Rennes, Rennes, France
| | - Frédéric Derbré
- Laboratory "Movement Sport and Health Sciences" EA7470, University of Rennes/ENS Rennes, Rennes, France
| | | | - Martine Ropert
- INSERM, Univ Rennes, INRAE, CHU Rennes, U 1241, Institut NuMeCan (Nutrition Metabolisms and Cancer), Rennes, France
- AEM2 Platform, Univ Rennes, University Hospital, Rennes, France
| | - Pascal Guggenbuhl
- INSERM, Univ Rennes, INRAE, CHU Rennes, U 1241, Institut NuMeCan (Nutrition Metabolisms and Cancer), Rennes, France
| | - Olivier Loréal
- INSERM, Univ Rennes, INRAE, CHU Rennes, U 1241, Institut NuMeCan (Nutrition Metabolisms and Cancer), Rennes, France
- AEM2 Platform, Univ Rennes, University Hospital, Rennes, France
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Fighting age-related orthopedic diseases: focusing on ferroptosis. Bone Res 2023; 11:12. [PMID: 36854703 PMCID: PMC9975200 DOI: 10.1038/s41413-023-00247-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 01/03/2023] [Accepted: 01/11/2023] [Indexed: 03/02/2023] Open
Abstract
Ferroptosis, a unique type of cell death, is characterized by iron-dependent accumulation and lipid peroxidation. It is closely related to multiple biological processes, including iron metabolism, polyunsaturated fatty acid metabolism, and the biosynthesis of compounds with antioxidant activities, including glutathione. In the past 10 years, increasing evidence has indicated a potentially strong relationship between ferroptosis and the onset and progression of age-related orthopedic diseases, such as osteoporosis and osteoarthritis. Therefore, in-depth knowledge of the regulatory mechanisms of ferroptosis in age-related orthopedic diseases may help improve disease treatment and prevention. This review provides an overview of recent research on ferroptosis and its influences on bone and cartilage homeostasis. It begins with a brief overview of systemic iron metabolism and ferroptosis, particularly the potential mechanisms of ferroptosis. It presents a discussion on the role of ferroptosis in age-related orthopedic diseases, including promotion of bone loss and cartilage degradation and the inhibition of osteogenesis. Finally, it focuses on the future of targeting ferroptosis to treat age-related orthopedic diseases with the intention of inspiring further clinical research and the development of therapeutic strategies.
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Ledesma-Colunga MG, Baschant U, Weidner H, Alves TC, Mirtschink P, Hofbauer LC, Rauner M. Transferrin receptor 2 deficiency promotes macrophage polarization and inflammatory arthritis. Redox Biol 2023; 60:102616. [PMID: 36746004 PMCID: PMC9932570 DOI: 10.1016/j.redox.2023.102616] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 01/19/2023] [Accepted: 01/24/2023] [Indexed: 02/04/2023] Open
Abstract
OBJECTIVE Rheumatoid arthritis is an inflammatory joint disease in which synovial iron deposition has been described. Transferrin receptor 2 (Tfr2) represents a critical regulator of systemic iron levels. Loss of Tfr2 function in humans and mice results in iron overload. As iron contributes to inflammatory processes, we investigated whether Tfr2-deletion affects the pathogenesis of inflammatory arthritis in an iron-dependent manner. METHODS Using a global and conditional genetic disruption of Tfr2, we assessed the relevance of Tfr2 in K/BxN serum-transfer arthritis (STA) and macrophage polarization. RESULTS Male Tfr2-/- mice subjected to STA developed pronounced joint swelling, and bone erosion as compared to Tfr2+/+ littermate-controls (P < 0.01). Furthermore, an increase of neutrophils and macrophages/monocytes was observed in the inflammatory infiltrate within the paws of Tfr2-/- mice. To elucidate whether Tfr2 in myeloid cells has a direct role in the pathogenesis of arthritis or whether the effects were mediated via the systemic iron overload, we induced STA in Tfr2fl/fl-LysMCre + mice, which showed normal iron-loading. Cre + female mice displayed increased disease development compared to Cre-controls. As macrophages regulate iron availability and innate immunity, we hypothesized that Tfr2-deficiency would polarize macrophages toward a pro-inflammatory state (M1) that contributes to arthritis progression. In response to IFN-γ stimulation, Tfr2-/- macrophages showed increased expression of M1-like cytokines, IFN-γ-target genes, nitric-oxide production, and prolonged STAT1 activation compared to Tfr2+/+ macrophages (P < 0.01), while pre-treatment with ruxolitinib abolished Tfr2-driven M1-like polarization. CONCLUSION Taken together, these findings suggest a protective role of Tfr2 in macrophages on the progression of arthritis via suppression of M1-like polarization.
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Affiliation(s)
- Maria G Ledesma-Colunga
- Department of Medicine III and Center for Healthy Aging, Technische Universität Dresden, Dresden, Germany
| | - Ulrike Baschant
- Department of Medicine III and Center for Healthy Aging, Technische Universität Dresden, Dresden, Germany
| | - Heike Weidner
- Department of Medicine III and Center for Healthy Aging, Technische Universität Dresden, Dresden, Germany
| | - Tiago C Alves
- Institute of Clinical Chemistry and Laboratory Medicine, Technische Universität Dresden, Dresden, Germany
| | - Peter Mirtschink
- Institute of Clinical Chemistry and Laboratory Medicine, Technische Universität Dresden, Dresden, Germany
| | - Lorenz C Hofbauer
- Department of Medicine III and Center for Healthy Aging, Technische Universität Dresden, Dresden, Germany
| | - Martina Rauner
- Department of Medicine III and Center for Healthy Aging, Technische Universität Dresden, Dresden, Germany.
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Baschant U, Altamura S, Steele-Perkins P, Muckenthaler MU, Spasić MV, Hofbauer LC, Steinbicker AU, Rauner M. Iron effects versus metabolic alterations in hereditary hemochromatosis driven bone loss. Trends Endocrinol Metab 2022; 33:652-663. [PMID: 35871125 DOI: 10.1016/j.tem.2022.06.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/12/2022] [Revised: 06/08/2022] [Accepted: 06/26/2022] [Indexed: 11/18/2022]
Abstract
Hereditary hemochromatosis (HH) is a genetic disorder in which mutations affect systemic iron homeostasis. Most subtypes of HH result in low hepcidin levels and iron overload. Accumulation of iron in various tissues can lead to widespread organ damage and to various complications, including liver cirrhosis, arthritis, and diabetes. Osteoporosis is another frequent complication of HH, and the underlying mechanisms are poorly understood. Currently, it is unknown whether iron overload in HH directly damages bone or whether complications associated with HH, such as liver cirrhosis or hypogonadism, affect bone secondarily. This review summarizes current knowledge of bone metabolism in HH and highlights possible implications of metabolic dysfunction in HH-driven bone loss. We further discuss therapeutic considerations managing osteoporosis in HH.
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Affiliation(s)
- Ulrike Baschant
- Department of Medicine III & Center for Healthy Aging, Technische Universität Dresden, Dresden, Germany
| | - Sandro Altamura
- Department of Pediatric Hematology, Oncology and Immunology, University of Heidelberg, Heidelberg, Germany
| | - Peter Steele-Perkins
- Institute of Comparative Molecular Endocrinology, University of Ulm, Ulm, Germany
| | - Martina U Muckenthaler
- Department of Pediatric Hematology, Oncology and Immunology, University of Heidelberg, Heidelberg, Germany
| | - Maja Vujić Spasić
- Institute of Comparative Molecular Endocrinology, University of Ulm, Ulm, Germany
| | - Lorenz C Hofbauer
- Department of Medicine III & Center for Healthy Aging, Technische Universität Dresden, Dresden, Germany
| | - Andrea U Steinbicker
- Department of Anesthesiology, Intensive Care Medicine and Pain Therapy, University Hospital Frankfurt, Goethe University, Frankfurt am Main, Germany
| | - Martina Rauner
- Department of Medicine III & Center for Healthy Aging, Technische Universität Dresden, Dresden, Germany.
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Abstract
An abundant metal in the human body, iron is essential for key biological pathways including oxygen transport, DNA metabolism, and mitochondrial function. Most iron is bound to heme but it can also be incorporated into iron-sulfur clusters or bind directly to proteins. Iron's capacity to cycle between Fe2+ and Fe3+ contributes to its biological utility but also renders it toxic in excess. Heme is an iron-containing tetrapyrrole essential for diverse biological functions including gas transport and sensing, oxidative metabolism, and xenobiotic detoxification. Like iron, heme is essential yet toxic in excess. As such, both iron and heme homeostasis are tightly regulated. Here we discuss molecular and physiologic aspects of iron and heme metabolism. We focus on dietary absorption; cellular import; utilization; and export, recycling, and elimination, emphasizing studies published in recent years. We end with a discussion on current challenges and needs in the field of iron and heme biology.
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Affiliation(s)
- Sohini Dutt
- Department of Animal and Avian Sciences and Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland, USA
| | - Iqbal Hamza
- Department of Animal and Avian Sciences and Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland, USA
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Rossi F, Tortora C, Di Martino M, Di Paola A, Di Pinto D, Marrapodi MM, Argenziano M, Pota E. Alteration of osteoclast activity in childhood cancer survivors: Role of iron and of CB2/TRPV1 receptors. PLoS One 2022; 17:e0271730. [PMID: 35862357 PMCID: PMC9302719 DOI: 10.1371/journal.pone.0271730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 07/06/2022] [Indexed: 11/30/2022] Open
Abstract
Childhood cancer survivors (CCS) are predisposed to the onset of osteoporosis (OP). It is known that iron overload induces osteoclasts (OCs) overactivity and that the iron chelator Deferasirox (DFX) can counteract it. The Cannabinoid Receptor type 2 (CB2) and the transient receptor potential vanilloid type-1 (TRPV1) are potential therapeutic targets for OP. In this study we isolated OCs from peripheral blood of 20 CCS and investigated osteoclast biomarkers expression and iron metabolism evaluating iron release by OCs and the expression of several molecules involved in its regulation. Moreover, we analyzed the effects of CB2 and TRPV1 stimulation in combination with DFX on osteoclast activity and iron metabolism. We observed, for the first time, an osteoclast hyperactivation in CCS suggesting a role for iron in its development. Moreover, we confirmed the well-known role of CB2 and TRPV1 receptors in bone metabolism, suggesting the receptors as possible key biomarkers of bone damage. Moreover, we demonstrated a promising synergism between pharmacological compounds, stimulating CB2 or inhibiting/desensitizing TRPV1 and DFX, in counteracting osteoclast overactivity in CCS to improve their quality of life.
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Affiliation(s)
- Francesca Rossi
- Department of Woman, Child and General and Specialist Surgery, University of Campania “Luigi Vanvitelli”, Napoli, Italy
- * E-mail:
| | - Chiara Tortora
- Department of Woman, Child and General and Specialist Surgery, University of Campania “Luigi Vanvitelli”, Napoli, Italy
| | - Martina Di Martino
- Department of Woman, Child and General and Specialist Surgery, University of Campania “Luigi Vanvitelli”, Napoli, Italy
| | - Alessandra Di Paola
- Department of Woman, Child and General and Specialist Surgery, University of Campania “Luigi Vanvitelli”, Napoli, Italy
| | - Daniela Di Pinto
- Department of Woman, Child and General and Specialist Surgery, University of Campania “Luigi Vanvitelli”, Napoli, Italy
| | - Maria Maddalena Marrapodi
- Department of Woman, Child and General and Specialist Surgery, University of Campania “Luigi Vanvitelli”, Napoli, Italy
| | - Maura Argenziano
- Department of Woman, Child and General and Specialist Surgery, University of Campania “Luigi Vanvitelli”, Napoli, Italy
| | - Elvira Pota
- Department of Woman, Child and General and Specialist Surgery, University of Campania “Luigi Vanvitelli”, Napoli, Italy
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Tortora C, Di Paola A, Creoli, M, Argenziano M, Martinelli M, Miele E, Rossi F, Strisciuglio C. Effects of CB2 and TRPV1 Stimulation on Osteoclast Overactivity Induced by Iron in Pediatric Inflammatory Bowel Disease. Inflamm Bowel Dis 2022; 28:1244-1253. [PMID: 35472140 PMCID: PMC9340523 DOI: 10.1093/ibd/izac073] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Indexed: 12/16/2022]
Abstract
BACKGROUND The reduction of bone mineral density and osteoporosis have high impacts on the health of patients with inflammatory bowel diseases (IBD). We have previously shown that a dysregulated iron metabolism occurs in IBD and leads to a decrease in circulating iron concentration and excessive intracellular sequestration of iron. Studies suggest that iron overload significantly affects the bone, accelerating osteoclast (OC) differentiation and activation, promoting bone resorption. Moreover, we demonstrated that iron overload causes OC overactivity. The cannabinoid receptor type 2 (CB2) and the transient receptor potential vanilloid type-1 (TRPV1) are potential therapeutic targets for bone diseases. The aim of this study was to evaluate the roles of CB2 and TRPV1 receptors and of iron in the development of osteoporosis in pediatric IBD. METHODS We differentiated OCs from peripheral blood mononuclear cells of patients with IBD and healthy donors and evaluated CB2 and TRPV1 receptor expression; OC activity, and iron metabolism by Western blot, TRAP assays, bone resorption assays, and iron assays. Moreover, we analyzed the effects of the pharmacological modulation of CB2 and TRPV1 receptors on OC activity and on the iron metabolism. RESULTS We confirmed the well-known roles of CB2 and TRPV1 receptors in bone metabolism and suggested that their stimulation can reduce the OC overactivity induced by iron, providing new insights into the pathogenesis of pediatric IBD-related bone resorption. CONCLUSIONS Stimulation of CB2 and TRPV1 could reduce IBD-related osteoporosis due to their direct effects on OC activity and to modulating the iron metabolism.
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Affiliation(s)
- Chiara Tortora
- Department of Woman, Child and General and Specialist Surgery, University of Campania “Luigi Vanvitelli,”Naples, Italy
| | - Alessandra Di Paola
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli,”Naples, Italy
| | - Mara Creoli,
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli,”Naples, Italy
| | - Maura Argenziano
- Department of Woman, Child and General and Specialist Surgery, University of Campania “Luigi Vanvitelli,”Naples, Italy
| | - Massimo Martinelli
- Department of Translational Medical Science, Section of Pediatrics, University of Naples “Federico II,” Naples, Italy
| | - Erasmo Miele
- Department of Translational Medical Science, Section of Pediatrics, University of Naples “Federico II,” Naples, Italy
| | - Francesca Rossi
- Address correspondence to: Francesca Rossi, MD, Department of Woman, Child and General and Special Surgery, University of Campania “Luigi Vanvitelli,” Via De Crecchio, 4, 80138 Naples, Italy ()
| | - Caterina Strisciuglio
- Department of Woman, Child and General and Specialist Surgery, University of Campania “Luigi Vanvitelli,”Naples, Italy
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Identification of Common Pathogenic Pathways Involved in Hemochromatosis Arthritis and Calcium Pyrophosphate Deposition Disease: a Review. Curr Rheumatol Rep 2022; 24:40-45. [PMID: 35143028 DOI: 10.1007/s11926-022-01054-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/03/2022] [Indexed: 12/15/2022]
Abstract
OBJECTIVES Arthritis is a common clinical manifestation of hereditary hemochromatosis (HH), and HH is one of a handful of conditions linked to calcium pyrophosphate deposition (CPPD) in joints. The connection between these two types of arthritis has not yet been fully elucidated. In light of new pathogenic pathways recently implicated in CPPD involving bone, we reviewed the literature on the etiology of hemochromatosis arthropathy (HHA) seeking shared pathogenic mechanisms. RESULTS Clinical observations reinforce striking similarities between HHA and CPPD even in the absence of CPP crystals. They share a similar joint distribution, low grade synovial inflammation, and generalized bone loss. Excess iron damages chondrocytes and bone cells in vitro. While direct effects of iron on cartilage are not consistently seen in animal models of HH, there is decreased osteoblast alkaline phosphatase activity, and increased osteoclastogenesis. These abnormalities are also seen in CPPD. Joint repair processes may also be impaired in both CPPD and HHA. CONCLUSIONS Possible shared pathogenic pathways relate more to bone and abnormal damage/repair mechanisms than direct damage to articular cartilage. While additional work is necessary to fully understand the pathogenesis of arthritis in HH and to firmly establish causal links with CPPD, this review provides some plausible hypotheses explaining the overlap of these two forms of arthritis.
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Ledesma-Colunga MG, Weidner H, Vujic Spasic M, Hofbauer LC, Baschant U, Rauner M. Shaping the bone through iron and iron-related proteins. Semin Hematol 2021; 58:188-200. [PMID: 34389111 DOI: 10.1053/j.seminhematol.2021.06.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 05/18/2021] [Accepted: 06/08/2021] [Indexed: 01/04/2023]
Abstract
Well-controlled iron levels are indispensable for health. Iron deficiency is the most common cause of anemia, whereas iron overload, either hereditary or secondary due to disorders of ineffective erythropoiesis, causes widespread organ failure. Bone is particularly sensitive to fluctuations in systemic iron levels as both iron deficiency and overload are associated with low bone mineral density and fragility. Recent studies have shown that not only iron itself, but also iron-regulatory proteins that are mutated in hereditary hemochromatosis can control bone mass. This review will summarize the current knowledge on the effects of iron on bone homeostasis and bone cell activities, and on the role of proteins that regulate iron homeostasis, i.e. hemochromatosis proteins and proteins of the bone morphogenetic protein pathway, on bone remodeling. As disorders of iron homeostasis are closely linked to bone fragility, deeper insights into common regulatory mechanisms may provide new opportunities to concurrently treat disorders affecting iron homeostasis and bone.
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Affiliation(s)
- Maria G Ledesma-Colunga
- Divisions of Endocrinology and Molecular Bone Biology, Department of Medicine III & University Center for Healty Aging, Technische Universität Dresden, Dresden, Germany
| | - Heike Weidner
- Divisions of Endocrinology and Molecular Bone Biology, Department of Medicine III & University Center for Healty Aging, Technische Universität Dresden, Dresden, Germany
| | - Maja Vujic Spasic
- Institute of Comparative Molecular Endocrinology, Ulm University, Ulm, Germany
| | - Lorenz C Hofbauer
- Divisions of Endocrinology and Molecular Bone Biology, Department of Medicine III & University Center for Healty Aging, Technische Universität Dresden, Dresden, Germany
| | - Ulrike Baschant
- Divisions of Endocrinology and Molecular Bone Biology, Department of Medicine III & University Center for Healty Aging, Technische Universität Dresden, Dresden, Germany
| | - Martina Rauner
- Divisions of Endocrinology and Molecular Bone Biology, Department of Medicine III & University Center for Healty Aging, Technische Universität Dresden, Dresden, Germany.
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Guo HH, Xiong L, Pan JX, Lee D, Liu K, Ren X, Wang B, Yang X, Cui S, Mei L, Xiong WC. Hepcidin contributes to Swedish mutant APP-induced osteoclastogenesis and trabecular bone loss. Bone Res 2021; 9:31. [PMID: 34108442 PMCID: PMC8190093 DOI: 10.1038/s41413-021-00146-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2020] [Revised: 12/17/2020] [Accepted: 01/05/2021] [Indexed: 02/08/2023] Open
Abstract
Patients with Alzheimer's disease (AD) often have lower bone mass than healthy individuals. However, the mechanisms underlying this change remain elusive. Previously, we found that Tg2576 mice, an AD animal model that ubiquitously expresses Swedish mutant amyloid precursor protein (APPswe), shows osteoporotic changes, reduced bone formation, and increased bone resorption. To understand how bone deficits develop in Tg2576 mice, we used a multiplex antibody array to screen for serum proteins that are altered in Tg2576 mice and identified hepcidin, a master regulator of iron homeostasis. We further investigated hepcidin's function in bone homeostasis and found that hepcidin levels were increased not only in the serum but also in the liver, muscle, and osteoblast (OB) lineage cells in Tg2576 mice at both the mRNA and protein levels. We then generated mice selectively expressing hepcidin in hepatocytes or OB lineage cells, which showed trabecular bone loss and increased osteoclast (OC)-mediated bone resorption. Further cell studies suggested that hepcidin increased OC precursor proliferation and differentiation by downregulating ferroportin (FPN) expression and increasing intracellular iron levels. In OB lineage cells, APPswe enhanced hepcidin expression by inducing ER stress and increasing OC formation, in part through hepcidin. Together, these results suggest that increased hepcidin expression in hepatocytes and OB lineage cells in Tg2576 mice contributes to enhanced osteoclastogenesis and trabecular bone loss, identifying the hepcidin-FPN-iron axis as a potential therapeutic target to prevent AD-associated bone loss.
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Affiliation(s)
- Hao-Han Guo
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH, USA
| | - Lei Xiong
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH, USA
- Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, OH, USA
| | - Jin-Xiu Pan
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH, USA
- Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, OH, USA
| | - Daehoon Lee
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH, USA
| | - Kevin Liu
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH, USA
- Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, OH, USA
| | - Xiao Ren
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH, USA
| | - Bo Wang
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH, USA
| | - Xiao Yang
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Shun Cui
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Lin Mei
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH, USA
- Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, OH, USA
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Wen-Cheng Xiong
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH, USA.
- Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, OH, USA.
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, GA, USA.
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