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Zhang Y, Cong Y, Du J, Guo D, Huang J, Pan J, Liang Y, Zhang J, Ye Z, Liu Y, Zhou Y. Lif-deficiency promote systemic Iron metabolism disorders and increases the susceptibility of osteoblasts to ferroptosis. Bone 2024; 189:117266. [PMID: 39341481 DOI: 10.1016/j.bone.2024.117266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2024] [Revised: 09/20/2024] [Accepted: 09/25/2024] [Indexed: 10/01/2024]
Abstract
Leukemia inhibitory factor (LIF) is a multifunctional cytokine that plays a crucial role in various biological processes. However, LIF involvement in iron metabolism remains almost unexplored. This study aimed to explore the impact of LIF on systemic iron transportation and its potential role in ferroptosis in osteoblasts. We observed that the Lif-deficient (Lif-/-) mice is characterized by a reduction in bone mass and a decrease in bone mineral density compared with wild-type (WT) mice. Energy-dispersive X-ray spectroscopy revealed a marked increase in iron content on the surface of femurs from Lif-/- mice. Meanwhile, iron stores test lower iron levels in the spleens and higher levels in the femurs of Lif-/- mice. Besides, Lif-/- mice display increased levels of serum iron, total iron-binding capacity, unsaturated iron-binding capacity, and transferrin saturation and serum ferritin relative to WT mice. Hepcidin mRNA expression reduction in the liver of Lif-/- mice. It also holds true in the AML-12 hepatocyte cell line after Lif-knockdown. Immunohistochemistry and RT-PCR revealed elevated ferroportin (FPN) in duodenal cells of Lif-/- mice. Lif-deficiency decreases SLC7A11 levels in osteoblasts. In addition, overexpression of LIF downregulates CD71, DCYTB, and DMT1, thereby reducing iron uptake in iron-overloaded cells. Femur immunohistochemistry (IHC) revealed increased ACSL4 and decreased GPX4 and SLC7A11, indicating an increase in ferroptosis of osteoblasts in Lif-/- mice. Whole-transcriptome sequencing showed gene expression changes after Lif-knockdown, exhibiting a negative correlation with genes involved in long-chain fatty acid transport, mitochondrial organization, and the p38 MAPK signaling pathway. These results demonstrate that Lif-deficiency alter systemic iron metabolism and increases the susceptibility of osteoblasts to ferroptosis.
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Affiliation(s)
- Yu Zhang
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, China
| | - Yaqi Cong
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, China
| | - Juan Du
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, China
| | - Donghua Guo
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, China
| | - Jing Huang
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, China
| | - Junchen Pan
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, China
| | - Youde Liang
- The People's Hospital of Baoan Shenzhen, Shenzhen, China
| | - Jiali Zhang
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, China
| | - Zhou Ye
- Applied Oral Sciences and Community Dental Care, Faculty of Dentistry, The University of Hong Kong, Hong Kong Special Administrative Region
| | - Yi Liu
- Department of Stomatology, Huangshi Central Hospital, Affiliated Hospital of Hubei Polytechnic University, Edong Healthcare Group, Huangshi 435002, China.
| | - Yi Zhou
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, China; Center for Prosthodontics and Implant Dentistry, Optics Valley Branch, School and Hospital of Stomatology, Wuhan University, Wuhan, China.
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Rankouhi TR, Keulen DV, Tempel D, Venhorst J. Oncostatin M: Risks and Benefits of a Novel Therapeutic Target for Atherosclerosis. Curr Drug Targets 2022; 23:1345-1369. [PMID: 35959619 DOI: 10.2174/1389450123666220811101032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 05/30/2022] [Accepted: 06/03/2022] [Indexed: 01/25/2023]
Abstract
BACKGROUND Cardiovascular disease (CVD) is a leading cause of death worldwide. It is predicted that approximately 23.6 million people will die from CVDs annually by 2030. Therefore, there is a great need for an effective therapeutic approach to combat this disease. The European Cardiovascular Target Discovery (CarTarDis) consortium identified Oncostatin M (OSM) as a potential therapeutic target for atherosclerosis. The benefits of modulating OSM - an interleukin (IL)-6 family cytokine - have since been studied for multiple indications. However, as decades of high attrition rates have stressed, the success of a drug target is determined by the fine balance between benefits and the risk of adverse events. Safety issues should therefore not be overlooked. OBJECTIVE In this review, a risk/benefit analysis is performed on OSM inhibition in the context of atherosclerosis treatment. First, OSM signaling characteristics and its role in atherosclerosis are described. Next, an overview of in vitro, in vivo, and clinical findings relating to both the benefits and risks of modulating OSM in major organ systems is provided. Based on OSM's biological function and expression profile as well as drug intervention studies, safety concerns of inhibiting this target have been identified, assessed, and ranked for the target population. CONCLUSION While OSM may be of therapeutic value in atherosclerosis, drug development should also focus on de-risking the herein identified major safety concerns: tissue remodeling, angiogenesis, bleeding, anemia, and NMDA- and glutamate-induced neurotoxicity. Close monitoring and/or exclusion of patients with various comorbidities may be required for optimal therapeutic benefit.
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Affiliation(s)
- Tanja Rouhani Rankouhi
- Department of Risk Analysis for Products in Development, TNO, Utrechtseweg 48, 3704 HE, Zeist, The Netherlands
| | - Daniëlle van Keulen
- SkylineDx BV, Science and Clinical Development, 3062 ME Rotterdam, The Netherlands
| | - Dennie Tempel
- SkylineDx BV, Science and Clinical Development, 3062 ME Rotterdam, The Netherlands
| | - Jennifer Venhorst
- Department of Risk Analysis for Products in Development, TNO, Utrechtseweg 48, 3704 HE, Zeist, The Netherlands
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Matsumura M, Murakami M, Funaba M. Transcriptional activation of hepcidin by the microphthalmia/transcription factor E family. Cell Biochem Funct 2022; 40:742-749. [PMID: 36062805 DOI: 10.1002/cbf.3739] [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] [Received: 06/26/2022] [Revised: 08/10/2022] [Accepted: 08/17/2022] [Indexed: 12/30/2022]
Abstract
Hepcidin negatively regulates the circulating iron levels by inhibiting the intestinal absorption of iron as well as iron release from macrophages. Hepcidin activity is largely determined by its expression, which is regulated at the transcriptional level. Hepcidin transcription is induced not only by the iron status-related bone morphogenetic protein (BMP)-2/6, but also by inflammatory cytokines, such as interleukin (IL)-1β and IL-6. The present study reveals that the microphthalmia (MiT)/transcription factor E (TFE) family members are novel regulators of hepcidin transcription. Melanocyte-inducing transcription factor (MITF)-A, a member of the MiT/TFE family, was identified as a positive regulator of hepcidin transcription via stimulus screening for transcription regulators. An E-box (5'-CATGTG-3') spanning nt-645 to nt-640 of the murine hepcidin promoter was identified as an MITF-A-responsive element. Responsiveness to MITF-A on hepcidin transcription decreased when the cells were stimulated with BMP2 or IL-1β. These results suggest a functional interaction between the MITF pathway and BMP- or IL-1β-mediated signaling. TFEB and TFE3, members of the MiT/TFE family, also stimulated hepcidin transcription, but the main region responsible for hepcidin transcription was distinct from that induced by MITF-A. The region spanning nt-581 to nt-526 was involved in TFEB/TFE3-mediated hepcidin transcription. Considering that members of the MiT/TFE family act as regulators of starvation-induced lysosomal biogenesis, hepcidin expression may be controlled by additional pathways apart from those identified so far.
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Affiliation(s)
- Manami Matsumura
- Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Masaru Murakami
- Laboratory of Molecular Biology, Azabu University School of Veterinary Medicine, Sagamihara, Japan
| | - Masayuki Funaba
- Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
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Hepcidin Promoted Ferroptosis through Iron Metabolism which Is Associated with DMT1 Signaling Activation in Early Brain Injury following Subarachnoid Hemorrhage. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2021:9800794. [PMID: 34987706 PMCID: PMC8723883 DOI: 10.1155/2021/9800794] [Citation(s) in RCA: 66] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 11/26/2021] [Accepted: 12/02/2021] [Indexed: 12/28/2022]
Abstract
Iron metabolism disturbances play an important role in early brain injury (EBI) after subarachnoid hemorrhage (SAH), and hepcidin largely influences iron metabolism. Importantly, iron metabolism may be associated with ferroptosis, recently a nonapoptotic iron-dependent form of cell death that may have a great impact on brain injury after SAH. We investigated hepcidin on iron metabolism and ferroptosis involving divalent metal transporter 1 (DMT1), and ferroportin-1 (FPN1) in a rat model of SAH. Male Sprague-Dawley rats were subjected to the endovascular perforation to induce SAH, and treated with heparin (inhibitor of hepcidin), or oncostatin M (OSM, inducer of hepcidin), or ebselen (inhibitor of DMT1) by intracerebroventricular injections. Hepcidin, DMT1, FPN1 and glutathione peroxidase 4 (GPX4), were detected by western blot and immunofluorescence. Iron metabolism was detected through Perl's iron staining and iron content assay. Ferroptosis, the ROS production, lipid peroxidation (LPO) was evaluated by monitoring methane dicarboxylic aldehyde (MDA), glutathione (GSH), glutathione peroxidase 4 (GPX4) activity, and transmission electron microscopy. Neurological deficit scores, Evans blue staining and brain water content were also determined to detect EBI 72 h after SAH. Our results showed that inhibition of DMT1 by ebselen could suppress iron accumulation and lipid peroxidation, and thereby alleviate ferroptosis and EBI in SAH rats. Heparin downregulated the expression of hepcidin and DMT1, increased FPN1, and exerted protective effects that were equivalent to those of ebselen on ferroptosis and EBI. In addition, OSM increased the expression of hepcidin and DMT1, decreased FPN1, and aggravated ferroptosis and EBI, while the effect on ferroptosis was reversed by ebselen. Therefore, the study revealed that hepcidin could regulate iron metabolism and contribute to ferroptosis via DMT1 signaling activation in rats with EBI after SAH.
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Fan L, Ou YJ, Zhu YX, Liang YD, Zhou Y, Wang YN. Lif Deficiency Leads to Iron Transportation Dysfunction in Ameloblasts. J Dent Res 2021; 101:63-72. [PMID: 34034544 DOI: 10.1177/00220345211011986] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Leukemia inhibitory factor (LIF), a member of the interleukin 6 family of cytokines, is involved in skeletal metabolism, blastocyst implantation, and stem cell pluripotency maintenance. However, the role of LIF in tooth development needs to be elucidated. The aim of the present study was to investigate the effect of Lif deficiency on tooth development and to elucidate the functions of Lif during tooth development and the underlying mechanisms. First, it was found that the incisors of Lif-knockout mice had a much whiter color than those of wild-type mice. Although there were no structural abnormalities or defective mineralization according to scanning electronic microscopy and computed tomography analysis, 3-dimensional images showed that the length of incisors was shorter in Lif-/- mice. Microhardness and acid resistance assays showed that the hardness and acid resistance of the enamel surface of Lif-/- mice were decreased compared to those of wild-type mice. In Lif-/- mice, whose general iron status was comparable to that of the control mice, the iron content of the incisors was significantly reduced, as confirmed by energy-dispersive X-ray spectroscopy (EDS) and Prussian blue staining. Histological staining showed that the cell length of maturation-stage ameloblasts was shorter in Lif-/- mice. Likewise, decreased expression of Tfrc and Slc40a1, both of which are crucial proteins for iron transportation, was observed in Lif-/- mice and Lif-knockdown ameloblast lineage cell lines, according to quantitative reverse transcription polymerase chain reaction, immunohistochemistry, and Western blot. Moreover, the upregulation of Tfrc and Slc40a1 induced by Lif stimulation was blocked by Stattic, a signal transducer and activator of transcription 3 (Stat3) signaling inhibitor. These results suggest that Lif deficiency inhibits iron transportation in the maturation-stage ameloblasts, and Lif modulates expression of Tfrc and Slc40a1 through the Stat3 signaling pathway during enamel development.
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Affiliation(s)
- L Fan
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Y J Ou
- Fujian Key Laboratory of Oral Diseases & Fujian Provincial Engineering Research Center of Oral Biomaterial & Stomatological Key Lab of Fujian College and University, School and Hospital of Stomatology, Fujian Medical University, Fuzhou, China
| | - Y X Zhu
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Y D Liang
- Yantian Hospital, Southern University of Science and Technology, Shenzhen, China
| | - Y Zhou
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, China.,Department of Prosthodontics, School and Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Y N Wang
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, China.,Department of Prosthodontics, School and Hospital of Stomatology, Wuhan University, Wuhan, China
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Abstract
Iron, an essential nutrient, is required for many biological processes but is also toxic in excess. The lack of a mechanism to excrete excess iron makes it crucial for the body to regulate the amount of iron absorbed from the diet. This regulation is mediated by the hepatic hormone hepcidin. Hepcidin also controls iron release from macrophages that recycle iron and from hepatocytes that store iron. Hepcidin binds to the only known iron export protein, ferroportin, inducing its internalization and degradation and thus limiting the amount of iron released into the plasma. Important regulators of hepcidin, and therefore of systemic iron homeostasis, include plasma iron concentrations, body iron stores, infection and inflammation, hypoxia and erythropoiesis, and, to a lesser extent, testosterone. Dysregulation of hepcidin production contributes to the pathogenesis of many iron disorders: hepcidin deficiency causes iron overload in hereditary hemochromatosis and non-transfused β-thalassemia, whereas overproduction of hepcidin is associated with iron-restricted anemias seen in patients with chronic inflammatory diseases and inherited iron-refractory iron-deficiency anemia. The present review summarizes our current understanding of the molecular mechanisms and signaling pathways contributing to hepcidin regulation by these factors and highlights the issues that still need clarification.
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Affiliation(s)
- Marie-Paule Roth
- Institut de Recherche en Santé Digestive (IRSD), Université de Toulouse, INSERM, INRA, ENVT, UPS, Toulouse, France.
| | - Delphine Meynard
- Institut de Recherche en Santé Digestive (IRSD), Université de Toulouse, INSERM, INRA, ENVT, UPS, Toulouse, France
| | - Hélène Coppin
- Institut de Recherche en Santé Digestive (IRSD), Université de Toulouse, INSERM, INRA, ENVT, UPS, Toulouse, France
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Jones SA, Jenkins BJ. Recent insights into targeting the IL-6 cytokine family in inflammatory diseases and cancer. Nat Rev Immunol 2018; 18:773-789. [DOI: 10.1038/s41577-018-0066-7] [Citation(s) in RCA: 435] [Impact Index Per Article: 72.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Abstract
Iron is required for many biological processes but is also toxic in excess; thus, body iron balance is maintained through sophisticated regulatory mechanisms. The lack of a regulated iron excretory mechanism means that body iron balance is controlled at the level of absorption from the diet. Iron absorption is regulated by the hepatic peptide hormone hepcidin. Hepcidin also controls iron release from cells that recycle or store iron, thus regulating plasma iron concentrations. Hepcidin exerts its effects through its receptor, the cellular iron exporter ferroportin. Important regulators of hepcidin, and therefore of systemic iron homeostasis, include plasma iron concentrations, body iron stores, infection and inflammation, and erythropoiesis. Disturbances in the regulation of hepcidin contribute to the pathogenesis of many iron disorders: hepcidin deficiency causes iron overload in hereditary hemochromatosis and nontransfused β-thalassemia, whereas overproduction of hepcidin is associated with iron-restricted anemias seen in patients with chronic kidney disease, chronic inflammatory diseases, some cancers, and inherited iron-refractory iron deficiency anemia. This review summarizes our current understanding of the molecular mechanisms and signaling pathways involved in the control of hepcidin synthesis in the liver, a principal determinant of plasma hepcidin concentrations.
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Affiliation(s)
- Veena Sangkhae
- Center for Iron Disorders, Department of Medicine, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA
| | - Elizabeta Nemeth
- Center for Iron Disorders, Department of Medicine, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA
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Sakamoto S, Kawabata H, Kanda J, Uchiyama T, Mizumoto C, Kitano T, Kondo T, Hishizawa M, Tomosugi N, Takaori-Kondo A. High pretransplant hepcidin levels are associated with poor overall survival and delayed platelet engraftment after allogeneic hematopoietic stem cell transplantation. Cancer Med 2016; 6:120-128. [PMID: 27905193 PMCID: PMC5269567 DOI: 10.1002/cam4.974] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Revised: 10/11/2016] [Accepted: 10/31/2016] [Indexed: 12/13/2022] Open
Abstract
Iron overload is considered a risk factor for mortality in patients with hematopoietic malignancies. Hepcidin is a key regulator of systemic iron balance. We previously reported dynamic changes of serum hepcidin‐25 levels in patients with hematologic malignancies after allogeneic hematopoietic stem cell transplantation (allo‐HSCT). In this study, we retrospectively analyzed the association of pretransplant hepcidin‐25 levels with overall survival (OS), engraftment, and other clinical outcomes of allo‐HSCT in patients with hematologic malignancies. A total of 166 patients were divided into two groups depending on their pretransplant serum hepcidin‐25 levels; their median age was 49.5 years, and the median follow‐up time was 46.8 months. At 3 years, the patients in the high‐hepcidin group had a significantly lower OS than those in the low‐hepcidin group (49.2 vs. 69.0%, respectively; P = 0.006). Multivariate analysis revealed that pretransplant serum hepcidin‐25 level, sex, and disease status were independently associated with OS. The incidence of platelet engraftment was significantly lower in the high‐hepcidin group than in the low‐hepcidin group, whereas no significant differences were observed in neutrophil and reticulocyte engraftments between these groups. Hence, pretransplant serum hepcidin levels can be a marker for predicting delayed platelet recovery after allo‐HSCT.
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Affiliation(s)
- Soichiro Sakamoto
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Hiroshi Kawabata
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan.,Department of Hematology and Immunology, Kanazawa Medical University, Uchinada-machi, Japan
| | - Junya Kanda
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Tatsuki Uchiyama
- Department of Hematology and Immunology, Japanese Red Cross Otsu Hospital, Otsu, Japan
| | - Chisaki Mizumoto
- Department of Hematology and Immunology, Japanese Red Cross Otsu Hospital, Otsu, Japan
| | - Toshiyuki Kitano
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Tadakazu Kondo
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Masakatsu Hishizawa
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Naohisa Tomosugi
- Division of Advanced Medicine, Medical Research Institute, Kanazawa Medical University, Uchinada-machi, Japan
| | - Akifumi Takaori-Kondo
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Kanamori Y, Murakami M, Matsui T, Funaba M. Role of a TPA-responsive element in hepcidin transcription induced by the bone morphogenetic protein pathway. Biochem Biophys Res Commun 2015; 466:162-6. [PMID: 26343458 DOI: 10.1016/j.bbrc.2015.08.123] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 08/28/2015] [Indexed: 12/11/2022]
Abstract
Systemic iron balance is governed by the liver-derived peptide hormone hepcidin. The transcription of hepcidin is primarily regulated by the bone morphogenetic protein (BMP) and inflammatory cytokine pathways through the BMP-response element (BMP-RE) and STAT-binding site, respectively. In addition to these elements, we previously identified a TPA-responsive element (TRE) in the hepcidin promoter and showed that it mediated the transcriptional activation of hepcidin through activator protein (AP)-1 induced by serum. In the present study, we examined the role of TRE in the BMP-induced transcription of hepcidin in HepG2 liver cells. The serum treatment increased the basal transcription of hepcidin; however, responsiveness to the expression of ALK3(QD), a constitutively active BMP type I receptor, was unaffected. Consistent with these results, mutations in TRE in the hepcidin promoter decreased basal transcription, whereas responsiveness to the expression of ALK3(QD) remained unchanged. HepG2 cells significantly expressed AP-1 components in the basal state, whereas BMP did not up-regulate the expression of these components. The expression of c-fos enhanced the basal transcription of hepcidin as well as ALK3(QD)-mediated hepcidin transcription, whereas that of dominant-negative c-fos decreased hepcidin transcription. The results of the present study suggested that the cis-elements of the hepcidin promoter, BMP-RE and TRE, individually transmitted BMP-mediated and AP-1-mediated signals, respectively, whereas transcription was synergistically increased by the stimulation of BMP-RE and TRE.
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Affiliation(s)
- Yohei Kanamori
- Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Masaru Murakami
- Laboratory of Molecular Biology, Azabu University School of Veterinary Medicine, Sagamihara 252-5201, Japan
| | - Tohru Matsui
- Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Masayuki Funaba
- Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan.
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Elks CM, Stephens JM. Oncostatin m modulation of lipid storage. BIOLOGY 2015; 4:151-60. [PMID: 25689119 PMCID: PMC4381222 DOI: 10.3390/biology4010151] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Revised: 01/29/2015] [Accepted: 02/11/2015] [Indexed: 02/02/2023]
Abstract
Oncostatin M (OSM) is a cytokine belonging to the gp130 family, whose members serve pleiotropic functions. However, several actions of OSM are unique from those of other gp130 cytokines, and these actions may have critical roles in inflammatory mechanisms influencing several metabolic and biological functions of insulin-sensitive tissues. In this review, the actions of OSM in adipose tissue and liver are discussed, with an emphasis on lipid metabolism.
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Affiliation(s)
- Carrie M Elks
- Adipocyte Biology Laboratory, Pennington Biomedical Research Center, 6400 Perkins Road, Baton Rouge, LA 70808, USA.
| | - Jacqueline M Stephens
- Adipocyte Biology Laboratory, Pennington Biomedical Research Center, 6400 Perkins Road, Baton Rouge, LA 70808, USA.
- Department of Biological Sciences, Louisiana State University, 202 Life Sciences Building, Baton Rouge, LA 70803, USA.
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12
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Kawabata H, Uchiyama T, Sakamoto S, Kanda J, Oishi S, Fujii N, Tomosugi N, Kadowaki N, Takaori-Kondo A. A HAMP promoter bioassay system for identifying chemical compounds that modulate hepcidin expression. Exp Hematol 2015; 43:404-413.e5. [PMID: 25633564 DOI: 10.1016/j.exphem.2015.01.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Revised: 11/28/2014] [Accepted: 01/16/2015] [Indexed: 12/11/2022]
Abstract
Hepcidin is the central regulator of systemic iron homeostasis; dysregulation of hepcidin expression causes various iron metabolic disorders, including hereditary hemochromatosis and anemia of inflammation. To identify molecules that modulate hepcidin expression, we developed a bioassay system for hepcidin gene (HAMP) promoter activity by stable transfection of Hep3B hepatoma cells with an expression plasmid in which EGFP was linked to a 2.5-kb human HAMP promoter. Interleukin 6, bone morphogenetic protein 6 (BMP-6), and oncostatin M, well-characterized stimulators of the HAMP promoter, strongly enhanced the green fluorescence intensity of these cells. Dorsomorphin, heparin, and cobalt chloride, known inhibitors of hepcidin expression, significantly suppressed green fluorescence intensity, and these inhibitory effects were more prominent when the cells were stimulated with BMP-6. Employing this system, we screened 1,280 biologically active small molecules and found several candidate inhibitors of hepcidin expression. Apomorphine, benzamil, etoposide, CGS-15943, kenpaullone, and rutaecarpine (all at 10 μmol/L) significantly inhibited hepcidin mRNA expression by Hep3B cells without affecting cell viability. CGS-15943 was the strongest suppressor of BMP-6-induced hepcidin-25 secretion in these cells. We conclude that our newly developed hepcidin promoter bioassay system is useful for identifying and evaluating compounds that modulate hepcidin expression.
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Affiliation(s)
- Hiroshi Kawabata
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
| | - Tatsuki Uchiyama
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Soichiro Sakamoto
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Junya Kanda
- Division of Hematology, Saitama Medical Center, Jichi Medical University, Saitama, Japan
| | - Shinya Oishi
- Laboratory of Bioorganic Medical Chemistry and Chemogenomics, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | - Nobutaka Fujii
- Laboratory of Bioorganic Medical Chemistry and Chemogenomics, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | - Naohisa Tomosugi
- Division of Advanced Medicine, Medical Research Institute, Kanazawa Medical University, Uchinada-machi, Japan
| | - Norimitsu Kadowaki
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Akifumi Takaori-Kondo
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Kanamori Y, Murakami M, Matsui T, Funaba M. The regulation of hepcidin expression by serum treatment: requirements of the BMP response element and STAT- and AP-1-binding sites. Gene 2014; 551:119-26. [PMID: 25151311 DOI: 10.1016/j.gene.2014.08.037] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Revised: 06/26/2014] [Accepted: 08/20/2014] [Indexed: 12/26/2022]
Abstract
Expression of hepcidin, a central regulator of systemic iron metabolism, is transcriptionally regulated by the bone morphogenetic protein (BMP) pathway. However, the factors other than the BMP pathway also participate in the regulation of hepcidin expression. In the present study, we show that serum treatment increased hepcidin expression and transcription without inducing the phosphorylation of Smad1/5/8 in primary hepatocytes, HepG2 cells or Hepa1-6 cells. Co-treatment with LDN-193189, an inhibitor of the BMP type I receptor, abrogated this hepcidin induction. Reporter assays using mutated reporters revealed the involvement of the BMP response element-1 (BMP-RE1) and signal transducers and activator of transcription (STAT)- and activator protein (AP)-1-binding sites in serum-induced hepcidin transcription in HepG2 cells. Serum treatment induced the expression of the AP-1 components c-fos and junB in primary hepatocytes and HepG2 cells. Forced expression of c-fos or junB enhanced the response of hepcidin transcription to serum treatment. By contrast, the expression of dominant negative (dn)-c-fos and dn-junB decreased hepcidin transcription. The present study reveals that serum contains factors stimulating hepcidin transcription. Basal BMP activity is essential for the serum-induced hepcidin transcription, although serum treatment does not stimulate the BMP pathway. The induction of c-fos and junB by serum treatment stimulates hepcidin transcription, through possibly cooperation with BMP-mediated signaling. Considering that AP-1 is induced by various stimuli, the present results suggest that hepcidin expression is regulated by more diverse factors than had been previously considered.
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Affiliation(s)
- Yohei Kanamori
- Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Masaru Murakami
- Laboratory of Molecular Biology, Azabu University School of Veterinary Medicine, Sagamihara 252-5201, Japan
| | - Tohru Matsui
- Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Masayuki Funaba
- Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan.
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Beigel F, Friedrich M, Probst C, Sotlar K, Göke B, Diegelmann J, Brand S. Oncostatin M mediates STAT3-dependent intestinal epithelial restitution via increased cell proliferation, decreased apoptosis and upregulation of SERPIN family members. PLoS One 2014; 9:e93498. [PMID: 24710357 PMCID: PMC3977870 DOI: 10.1371/journal.pone.0093498] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Accepted: 03/06/2014] [Indexed: 11/18/2022] Open
Abstract
Objective Oncostatin M (OSM) is produced by activated T cells, monocytes, and dendritic cells and signals through two distinct receptor complexes consisting of gp130 and LIFR (I) or OSMR-β and gp130 (II), respectively. Aim of this study was to analyze the role of OSM in intestinal epithelial cells (IEC) and intestinal inflammation. Methods OSM expression and OSM receptor distribution was analyzed by PCR and immunohistochemistry experiments, signal transduction by immunoblotting. Gene expression studies were performed by microarray analysis and RT-PCR. Apoptosis was measured by caspases-3/7 activity. IEC migration and proliferation was studied in wounding and water soluble tetrazolium assays. Results The IEC lines Caco-2, DLD-1, SW480, HCT116 and HT-29 express mRNA for the OSM receptor subunits gp130 and OSMR-β, while only HCT116, HT-29 and DLD-1 cells express LIFR mRNA. OSM binding to its receptor complex activates STAT1, STAT3, ERK-1/2, SAPK/JNK-1/2, and Akt. Microarray analysis revealed 79 genes that were significantly up-regulated (adj.-p≤0.05) by OSM in IEC. Most up-regulated genes belong to the functional categories “immunity and defense” (p = 2.1×10−7), “apoptosis” (p = 3.7×10−4) and “JAK/STAT cascade” (p = 3.4×10−6). Members of the SERPIN gene family were among the most strongly up-regulated genes. OSM significantly increased STAT3- and MEK1-dependent IEC cell proliferation (p<0.05) and wound healing (p = 3.9×10−5). OSM protein expression was increased in colonic biopsies of patients with active inflammatory bowel disease (IBD). Conclusions OSM promotes STAT3-dependent intestinal epithelial cell proliferation and wound healing in vitro. Considering the increased OSM expression in colonic biopsy specimens of patients with active IBD, OSM upregulation may modulate a barrier-protective host response in intestinal inflammation. Further in vivo studies are warranted to elucidate the exact role of OSM in intestinal inflammation and the potential of OSM as a drug target in IBD.
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Affiliation(s)
- Florian Beigel
- Department of Medicine II, University-Hospital Munich-Grosshadern, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Matthias Friedrich
- Department of Medicine II, University-Hospital Munich-Grosshadern, Ludwig-Maximilians-University Munich, Munich, Germany
- Clinic for Preventive Dentistry and Parodontology, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Corina Probst
- Department of Medicine II, University-Hospital Munich-Grosshadern, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Karl Sotlar
- Institute of Pathology, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Burkhard Göke
- Department of Medicine II, University-Hospital Munich-Grosshadern, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Julia Diegelmann
- Department of Medicine II, University-Hospital Munich-Grosshadern, Ludwig-Maximilians-University Munich, Munich, Germany
- Clinic for Preventive Dentistry and Parodontology, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Stephan Brand
- Department of Medicine II, University-Hospital Munich-Grosshadern, Ludwig-Maximilians-University Munich, Munich, Germany
- * E-mail:
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15
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Taniguchi K, Karin M. IL-6 and related cytokines as the critical lynchpins between inflammation and cancer. Semin Immunol 2014; 26:54-74. [PMID: 24552665 DOI: 10.1016/j.smim.2014.01.001] [Citation(s) in RCA: 495] [Impact Index Per Article: 49.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Accepted: 01/06/2014] [Indexed: 11/17/2022]
Abstract
Inflammatory responses play pivotal roles in cancer development, including tumor initiation, promotion, progression, and metastasis. Cytokines are now recognized as important mediators linking inflammation and cancer, and are therefore potential therapeutic and preventive targets as well as prognostic factors. The interleukin (IL)-6 family of cytokines, especially IL-6 and IL-11, is highly up-regulated in many cancers and considered as one of the most important cytokine families during tumorigenesis and metastasis. This review discusses molecular mechanisms linking the IL-6 cytokine family to solid malignancies and their treatment.
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Affiliation(s)
- Koji Taniguchi
- Laboratory of Gene Regulation and Signal Transduction, Departments of Pharmacology and Pathology, School of Medicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA; Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan; Department of Microbiology and Immunology, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Michael Karin
- Laboratory of Gene Regulation and Signal Transduction, Departments of Pharmacology and Pathology, School of Medicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA; UC San Diego Moores Cancer Center, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA.
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16
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Richards CD. The enigmatic cytokine oncostatin m and roles in disease. ISRN INFLAMMATION 2013; 2013:512103. [PMID: 24381786 PMCID: PMC3870656 DOI: 10.1155/2013/512103] [Citation(s) in RCA: 142] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Accepted: 09/29/2013] [Indexed: 12/11/2022]
Abstract
Oncostatin M is a secreted cytokine involved in homeostasis and in diseases involving chronic inflammation. It is a member of the gp130 family of cytokines that have pleiotropic functions in differentiation, cell proliferation, and hematopoetic, immunologic, and inflammatory networks. However, Oncostatin M also has activities novel to mediators of this cytokine family and others and may have fundamental roles in mechanisms of inflammation in pathology. Studies have explored Oncostatin M functions in cancer, bone metabolism, liver regeneration, and conditions with chronic inflammation including rheumatoid arthritis, lung and skin inflammatory disease, atherosclerosis, and cardiovascular disease. This paper will review Oncostatin M biology in a historical fashion and focus on its unique activities, in vitro and in vivo, that differentiate it from other cytokines and inspire further study or consideration in therapeutic approaches.
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Affiliation(s)
- Carl D. Richards
- McMaster Immunology Research Centre, Department of Pathology and Molecular Medicine, McMaster University, 1280 Main Street, West, Hamilton, ON, Canada L8S 4K1
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17
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Sivgin S, Eser B. The management of iron overload in allogeneic hematopoietic stem cell transplant (alloHSCT) recipients: where do we stand? Ann Hematol 2013; 92:577-86. [PMID: 23430087 DOI: 10.1007/s00277-013-1682-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Accepted: 01/15/2013] [Indexed: 01/19/2023]
Abstract
Iron overload (IO), primarily related to multiple red blood cell transfusions, is a relatively common complication in hematopoietic stem cell transplant (HSCT) recipients. Elevated pretransplant ferritin levels have been reported to increase the risk of non-relapse mortality following HSCT and might influence the risk of acute and chronic graft versus host disease. IO has been shown to be an important cause of mortality and morbidity in patients who have undergone alloHSCT (Armand et al., Blood 109:4586-4588, 2007; Kim et al., Acta Haematol 120:182-189, 2008; Kataoka et al., Biol Blood Marrow Transplant 15:195-204, 2009). We know that excessive iron accumulation results in tissue damage and organ failure, mainly as a result of the generation of free radicals that cause oxidative damage and organ dysfunction (e.g., hepatotoxicity, cardiotoxicity, and endocrine dysfunction) (Altes et al., Bone Marrow Transplantation 29: 987-989, 2002; Papanikolaou et al., Toxicol Appl Pharmac 202:199-211, 2005). In the last decade, efforts have been directed toward identifying alternative treatment for IO in alloHSCT recipients to maintain improved transplant outcomes.
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Affiliation(s)
- Serdar Sivgin
- Department of Hematology, Faculty of Medicine, Dedeman Stem Cell Transplantation Hospital, Erciyes University, Kayseri, Turkey.
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18
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Mizumoto C, Kawabata H, Uchiyama T, Sakamoto S, Kanda J, Tomosugi N, Takaori-Kondo A. Acidic milieu augments the expression of hepcidin, the central regulator of iron homeostasis. Int J Hematol 2012. [DOI: 10.1007/s12185-012-1223-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Mathieu ME, Saucourt C, Mournetas V, Gauthereau X, Thézé N, Praloran V, Thiébaud P, Bœuf H. LIF-dependent signaling: new pieces in the Lego. Stem Cell Rev Rep 2012; 8:1-15. [PMID: 21537995 PMCID: PMC3285761 DOI: 10.1007/s12015-011-9261-7] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
LIF, a member of the IL6 family of cytokine, displays pleiotropic effects on various cell types and organs. Its critical role in stem cell models (e.g.: murine ES, human mesenchymal cells) and its essential non redundant function during the implantation process of embryos, in eutherian mammals, put this cytokine at the core of many studies aiming to understand its mechanisms of action, which could benefit to medical applications. In addition, its conservation upon evolution raised the challenging question concerning the function of LIF in species in which there is no implantation. We present the recent knowledge about the established and potential functions of LIF in different stem cell models, (embryonic, hematopoietic, mesenchymal, muscle, neural stem cells and iPSC). We will also discuss EVO-DEVO aspects of this multifaceted cytokine.
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Affiliation(s)
- Marie-Emmanuelle Mathieu
- Univ. de Bordeaux, CIRID, UMR5164, F-33000 Bordeaux, France
- CNRS, CIRID, UMR5164, F-33000 Bordeaux, France
| | - Claire Saucourt
- Univ. de Bordeaux, CIRID, UMR5164, F-33000 Bordeaux, France
- CNRS, CIRID, UMR5164, F-33000 Bordeaux, France
| | - Virginie Mournetas
- Univ. de Bordeaux, CIRID, UMR5164, F-33000 Bordeaux, France
- CNRS, CIRID, UMR5164, F-33000 Bordeaux, France
| | - Xavier Gauthereau
- Univ. de Bordeaux, CIRID, UMR5164, F-33000 Bordeaux, France
- CNRS, CIRID, UMR5164, F-33000 Bordeaux, France
| | - Nadine Thézé
- Univ. de Bordeaux, CIRID, UMR5164, F-33000 Bordeaux, France
- CNRS, CIRID, UMR5164, F-33000 Bordeaux, France
| | - Vincent Praloran
- Univ. de Bordeaux, CIRID, UMR5164, F-33000 Bordeaux, France
- CNRS, CIRID, UMR5164, F-33000 Bordeaux, France
| | - Pierre Thiébaud
- Univ. de Bordeaux, CIRID, UMR5164, F-33000 Bordeaux, France
- CNRS, CIRID, UMR5164, F-33000 Bordeaux, France
| | - Hélène Bœuf
- Univ. de Bordeaux, CIRID, UMR5164, F-33000 Bordeaux, France
- CNRS, CIRID, UMR5164, F-33000 Bordeaux, France
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20
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Pretreatment with CO-releasing molecules suppresses hepcidin expression during inflammation and endoplasmic reticulum stress through inhibition of the STAT3 and CREBH pathways. Blood 2012; 119:2523-32. [PMID: 22262759 DOI: 10.1182/blood-2011-07-366690] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The circulating peptide hormone hepcidin maintains systemic iron homeostasis. Hepcidin production increases during inflammation and as a result of endoplasmic reticulum (ER) stress. Elevated hepcidin levels decrease dietary iron absorption and promote iron sequestration in reticuloendothelial macrophages. Furthermore, increased plasma hepcidin levels cause hypoferremia and the anemia associated with chronic diseases. The signal transduction pathways that regulate hepcidin during inflammation and ER stress include the IL-6-dependent STAT-3 pathway and the unfolded protein response-associated cyclic AMP response element-binding protein-H (CREBH) pathway, respectively. We show that carbon monoxide (CO) suppresses hepcidin expression elicited by IL-6- and ER-stress agents by inhibiting STAT-3 phosphorylation and CREBH maturation, respectively. The inhibitory effect of CO on IL-6-inducible hepcidin expression is dependent on the suppressor of cytokine signaling-3 (SOCS-3) protein. Induction of ER stress in mice resulted in increased hepatic and serum hepcidin. CO administration inhibited ER-stress-induced hepcidin expression in vivo. Furthermore, ER stress caused iron accumulation in splenic macrophages, which could be prevented by CO. Our findings suggest novel anti-inflammatory therapeutic applications for CO, as well as therapeutic targets for the amelioration of anemia in the hypoferremic condition associated with chronic inflammatory and metabolic diseases.
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21
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Kanda J, Kawabata H, Chao NJ. Iron overload and allogeneic hematopoietic stem-cell transplantation. Expert Rev Hematol 2011; 4:71-80. [PMID: 21322780 DOI: 10.1586/ehm.10.81] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Iron overload is frequently observed in patients with hematologic diseases before and after allogeneic stem-cell transplantation because they usually receive multiple red blood cell transfusions. Elevated pretransplant serum ferritin levels, which are widely used as indicators of body iron status, are significantly associated with a lower overall survival rate and a higher incidence of treatment-related complications; for example, infections and hepatic veno-occlusive disease. As serum ferritin levels are affected, not only by iron loading but also by inflammation, imaging techniques to quantify tissue iron levels have been developed, for example, quantitative MRI using the transverse magnetic relaxation rate, and superconducting quantum interference devices. Iron chelators, such as deferasirox, a new oral iron-chelating agent, reduce iron load in transfusion-dependent patients. Iron-chelating therapy before and/or after transplantation is a promising strategy to improve the clinical outcomes of transplant patients with iron overload. However, further research is needed to prove the direct relationship between iron overload and adverse outcomes, as well as to determine the effects of treatment for iron overload on outcomes of allogeneic stem-cell transplantation.
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Affiliation(s)
- Junya Kanda
- Division of Cellular Therapy, Department of Medicine, Duke University Medical Center, 2400 Pratt Street, Suite 1100, Durham, NC 27705, USA.
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22
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Bartnikas TB, Fleming MD. A tincture of hepcidin cures all: the potential for hepcidin therapeutics. J Clin Invest 2010; 120:4187-90. [PMID: 21099105 DOI: 10.1172/jci45043] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Iron overload as a result of blood transfusions and excessive intestinal iron absorption can be a complication of chronic anemias such as β-thalassemia. Inappropriately low levels of hepcidin, a negative regulator of iron absorption and recycling, underlie the pathophysiology of the intestinal hyperabsorption. In this issue of the JCI, Gardenghi et al. demonstrate that increasing hepcidin expression to induce iron deficiency in murine β-thalassemia not only mitigates the iron overload, but also the severity of the anemia. These data illustrate the therapeutic potential of modulating hepcidin expression in diseases associated with altered iron metabolism.
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Affiliation(s)
- Thomas B Bartnikas
- Department of Pathology, Children's Hospital Boston, Boston, Massachusetts, USA
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23
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Ferroportin and erythroid cells: an update. Adv Hematol 2010; 2010. [PMID: 20827391 PMCID: PMC2935194 DOI: 10.1155/2010/404173] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2009] [Revised: 04/08/2010] [Accepted: 06/23/2010] [Indexed: 12/21/2022] Open
Abstract
In recent years there have been major advances in our knowledge of the regulation of iron metabolism that have had implications for understanding the pathophysiology of some human disorders like beta-thalassemia and other iron overload diseases. However, little is known about the relationship among ineffective erythropoiesis, the role of iron-regulatory genes, and tissue iron distribution in beta-thalassemia. The principal aim of this paper is an update about the role of Ferroportin during human normal and pathological erythroid differentiation. Particular attention will be given to beta-thalassemia and other diseases with iron overload. Recent discoveries indicate that there is a potential for therapeutic intervention in beta-thalassemia by means of manipulating iron metabolism.
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Chung B, Verdier F, Matak P, Deschemin JC, Mayeux P, Vaulont S. Oncostatin M is a potent inducer of hepcidin, the iron regulatory hormone. FASEB J 2010; 24:2093-103. [PMID: 20124431 DOI: 10.1096/fj.09-152561] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Erythropoietic activity is known to affect iron homeostasis through regulation of the liver iron regulatory hormone hepcidin. To identify new factors secreted by the erythroblasts that could influence hepcidin synthesis, we set up a coculture model. HuH7 hepatoma cells cocultured with primary human erythroblasts or erythroleukemic UT7 cells presented a 20- to 35-fold increase of hepcidin gene expression. This induction was fully blunted in the presence of a neutralizing oncostatin M antibody, demonstrating that this cytokine, belonging to the IL-6 family of cytokines, was responsible for increased levels of hepcidin expression. We further demonstrated that recombinant oncostatin M induced a dramatic transcriptional increase of hepcidin in HuH7 cells through specific activation of the STAT pathway. Hepcidin induction by oncostatin M was also observed in hepatocytes in primary culture and is believed to be cell specific since no induction was found in isolated bone marrow cells, macrophagic, stromal, and lymphoma-derived cell lines, nor in erythroblasts. Finally, we show that oncostatin M administration in vivo increases hepcidin expression and leads to significantly decreased serum iron levels. This work identifies a new potent inducer of hepcidin expression in the liver and supports a role for modulators of oncostatin M signaling pathway in treating iron disorders.
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Affiliation(s)
- Bomee Chung
- Université Paris Descartes, Centre National de la Recherche Scientifique (UMR 8104), Paris, France
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