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Del Vecchio L, Girelli D, Vinchi F, Cozzolino M, Elliott S, Mark PB, Valenti L, Qian C, Guo Q, Qian ZM, Ciceri P, Locatelli F. Iron biology. Nephrol Dial Transplant 2024; 39:1404-1415. [PMID: 38658189 DOI: 10.1093/ndt/gfae095] [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: 02/11/2024] [Indexed: 04/26/2024] Open
Abstract
Iron is a fundamental element for biological life, from bacteria to humans. Iron is essential for cell function and survival, energy production and metabolism, whereas increased levels cause oxidative stress. It is also a constituent of haemoglobin and thus it is necessary for oxygen transportation through the body. Given these multiple functions, the regulation of iron metabolism is complex and tight coupled with oxygen homeostasis at tissue and cellular levels, thanks to the interaction with the hypoxia inducible factor system. In patients with chronic kidney disease (CKD), iron deficiency significantly contributes to anaemia development. This frequently overlaps with chronic inflammation, causing iron- restricted erythropoiesis. To add further complexity, metabolic hyperferritinemia may, on one hand, increase the risk for CKD and, on the other, overlaps with functional iron deficiency. Excessive intracellular iron in certain cell types during CKD can also mediate cellular death (called ferroptosis), and contribute to the pathogenesis of kidney damage, atherosclerosis and vascular calcifications. This review is aimed at broadening the perspective of iron metabolism in the setting of CKD not just as a contributor to anaemia in CKD patients, but also as an important player with an impact on cell metabolism, renal fibrosis and the cardiovascular system.
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Affiliation(s)
- Lucia Del Vecchio
- Department of Nephrology and Dialysis, Sant'Anna Hospital, ASST Lariana, Como 22100, Italy
| | - Domenico Girelli
- Department of Medicine, Section of Internal Medicine, University of Verona, Verona, Italy
| | - Francesca Vinchi
- Iron Research Laboratory, Lindsley Kimball Research Institute, New York Blood Center, NY, USA
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, NY, USA
| | - Mario Cozzolino
- Renal Division, Department of Health Sciences, ASST Santi Paolo e Carlo, University of Milan, Milan, Italy
| | | | - Patrick B Mark
- School of Cardiovascular and Metabolic Health, University of Glasgow, Glasgow, UK
| | - Luca Valenti
- Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Milan, Italy
- Precision Medicine, Biological Resource Center Unit, Department of Transfusion Medicine, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Christopher Qian
- School of Biomedical Sciences and Gerald Choa Neuroscience Centre, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, NT, Hong Kong
| | - Qian Guo
- School of Medicine, Shanghai University, Shanghai, China
| | - Zhong-Ming Qian
- Institute of Translational & Precision Medicine, Nantong University, Nantong, JS, China
- Laboratory of Neuropharmacology, Fudan University School of Pharmacy, Shanghai; and National Clinical Research Center for Aging and Medicine, Huashan Hospital, Fudan University, Shanghai, China
| | - Paola Ciceri
- Renal Division, Department of Health Sciences, ASST Santi Paolo e Carlo, University of Milan, Milan, Italy
| | - Francesco Locatelli
- Department of Nephrology and Dialysis, (Past Director) Alessandro Manzoni Hospital, ASST Lecco, Lecco, Italy
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Mizuiri S, Nishizawa Y, Yamashita K, Doi T, Okubo A, Morii K, Usui K, Arita M, Naito T, Shigemoto K, Masaki T. Absolute iron deficiency, coronary artery calcification and cardiovascular mortality in maintenance haemodialysis patients. Nephrology (Carlton) 2024; 29:415-421. [PMID: 38501665 DOI: 10.1111/nep.14289] [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: 07/24/2023] [Revised: 11/24/2023] [Accepted: 02/24/2024] [Indexed: 03/20/2024]
Abstract
AIM The effects of iron on vascular calcification in rats and vascular smooth muscle cells were recently reported, but clinical studies on iron and vascular calcification are scant. We studied the associations of absolute iron deficiency, coronary artery calcification and mortality in patients with maintenance haemodialysis (MHD). METHODS Transferrin saturation (TSAT), ferritin, mean corpuscular haemoglobin (MCH) and Agatston coronary artery calcium score (CACS) were studied at baseline in MHD patients and followed up for 3 years. Cox proportional hazard analyses for mortality and linear regression analyses for CACS were performed. RESULTS In 306 patients, the median age was 67 (56-81) years, dialysis duration was 76 (38-142) months, and diabetes prevalence was 42.5%. Fifty-two patients had died by 3 years. Patients with absolute iron deficiency (TSAT <20% and ferritin <100 ng/mL) (n = 102) showed significantly higher CACS (p = .0266) and C-reactive protein (p = .0011), but a lower frequency of iron formulation administration compared with patients without absolute iron deficiency at baseline (n = 204). Absolute iron deficiency was a significant predictor for 3-year cardiovascular (CV) mortality (hazard ratio: 2.08; p = .0466), but not for 3-year all-cause mortality. CACS was significant predictor for both 3-year CV and all-cause mortality (p <.05). Absolute iron deficiency and MCH were significant determinants of CACS (p < .05). CONCLUSION MHD patients with absolute iron deficiency showed significantly higher CACS than others, and absolute iron deficiency was a significant risk factor for coronary artery calcification and 3-year CV mortality in MHD patients, but was not a significant predictor for 3-year all-cause mortality.
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Affiliation(s)
- Sonoo Mizuiri
- Division of Nephrology, Ichiyokai Harada Hospital, Hiroshima, Japan
| | | | | | - Toshiki Doi
- Division of Nephrology, Ichiyokai Harada Hospital, Hiroshima, Japan
- Department of Nephrology, Hiroshima University, Hiroshima, Japan
| | - Aiko Okubo
- Division of Nephrology, Ichiyokai Harada Hospital, Hiroshima, Japan
- Department of Nephrology, Hiroshima University, Hiroshima, Japan
| | - Kenichi Morii
- Division of Nephrology, Ichiyokai Harada Hospital, Hiroshima, Japan
- Department of Nephrology, Hiroshima University, Hiroshima, Japan
| | - Koji Usui
- Ichiyokai Ichiyokai Clinic, Hiroshima, Japan
| | | | | | | | - Takao Masaki
- Department of Nephrology, Hiroshima University, Hiroshima, Japan
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Guo C, Quan Z, Ke J, Zang H, Teng Q, Li X, Peng D, Wang P. Hypoxia-Inducible Factor-1 α Regulates High Phosphate-Induced Vascular Calcification via Type III Sodium-Dependent Phosphate Cotransporter 1. Cardiol Res Pract 2024; 2024:6346115. [PMID: 38566807 PMCID: PMC10987242 DOI: 10.1155/2024/6346115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 03/08/2024] [Accepted: 03/18/2024] [Indexed: 04/04/2024] Open
Abstract
Vascular calcification (VC) has a high incidence in patients with chronic kidney disease, which is a worldwide public health problem and presents a heavy burden to society. Hypoxia-inducible factor (HIF)-1α, the active subunit of HIF-1, has been reported to play a vital role in high phosphate-induced VC. However, the underlying mechanism is still undetermined, and effective treatment is unavailable. In the present study, human aortic smooth muscle cells (HASMCs) were cultured under normal or high phosphate media conditions. HIF-1α small interfering RNA and overexpression plasmids were employed to regulate HIF-1α expression. Phosphonoformic acid was employed to restrain the function of type III sodium-dependent phosphate cotransporter 1 (Pit-1). The expression levels of HIF-1α, Pit-1, runt-related transcription factor 2 (Runx2), and smooth muscle 22 alpha (SM22α) were evaluated, and the calcium contents were also examined. Cell growth was assessed using an MTT assay. High phosphate stimulation caused an upregulation in HIF-1α and Pit-1 expression levels and induced calcium depositions in HASMCs. Upregulation of Runx2 expression accompanied by downregulation of SM22α expression was observed in the high phosphate group. Following the suppression of HIF-1α expression, there was a concomitant attenuation in Pit-1 expression, calcium deposition, the alteration of phenotypic transition marker genes, and vice versa. The most serious calcium deposition was noted in HASMCs cultured under high phosphate conditions which were pretreated with a HIF-1α overexpression plasmid. However, when the biological functions of Pit-1 were restrained, the putative serious calcium deposition was not formed even in HASMCs transfected with a HIF-1α overexpression plasmid. The findings confirmed that HIF-1α regulated Pit-1 expression and exerted its pro-calcifying effect through Pit-1, which identified HIF-1α and Pit-1 as therapeutic targets for high phosphate-induced VC.
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Affiliation(s)
- Chengkun Guo
- Nephrology Department, Jingmen Central Hospital Affiliated to Hubei Minzu University, Jingmen, Hubei 448000, China
| | - Zhengli Quan
- Nephrology Department, Jingmen Central Hospital Affiliated to Hubei Minzu University, Jingmen, Hubei 448000, China
| | - Jingjing Ke
- Nephrology Department, Jingmen Central Hospital Affiliated to Hubei Minzu University, Jingmen, Hubei 448000, China
| | - Hualong Zang
- Nephrology Department, Jingmen Central Hospital Affiliated to Hubei Minzu University, Jingmen, Hubei 448000, China
| | - Qiuping Teng
- Nephrology Department, Jingmen Central Hospital Affiliated to Hubei Minzu University, Jingmen, Hubei 448000, China
| | - Xin Li
- Nephrology Department, Jingmen Central Hospital Affiliated to Hubei Minzu University, Jingmen, Hubei 448000, China
| | - Dan Peng
- Neonatology Department, Jingmen Central Hospital Affiliated to Hubei Minzu University, Jingmen, Hubei 448000, China
| | - Ping Wang
- Nephrology Department, Jingmen Central Hospital Affiliated to Hubei Minzu University, Jingmen, Hubei 448000, China
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Iron overload impairs renal function and is associated with vascular calcification in rat aorta. Biometals 2022; 35:1325-1339. [PMID: 36178540 PMCID: PMC9674728 DOI: 10.1007/s10534-022-00449-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Accepted: 09/16/2022] [Indexed: 12/14/2022]
Abstract
Vascular calcification (VC) has been associated with a risk of cardiovascular diseases. Iron may play a critical role in progressive VC. Therefore, we investigated the effects of iron overload on the aorta of rats. A rat model of iron overload was established by intraperitoneal injection of Iron-Dextran. The levels of iron, calcium, and ALP activity were detected. Von Kossa staining and Perl's staining were conducted. The expression of iron metabolism-related and calcification related factors were examined in the aortic tissue of rats. The results showed serum and aortic tissue iron were increased induced by iron overload and excessive iron induced hepatic and renal damage. In iron overload rats, the expression of divalent metal transporter 1 (DMT1) and hepcidin were higher, but ferroportin1 (FPN1) was lower. Von Kossa staining demonstrated calcium deposition in the aorta of iron overload rats. The calcium content and ALP activity in serum and aortic tissue were increased and iron level in aortic tissue highly correlated with calcium content and ALP activity. The expressions of the osteogenic markers were increased while a decrease of Alpha-smooth muscle actin (α-SMA) in the aortic tissue of iron overload rats. IL-24 was increased during the calcification process induced by iron. Overall, we demonstrated excessive iron accumulation in the aortic tissue and induced organs damage. The iron metabolism-related factors were significantly changed during iron overload. Moreover, we found that iron overload leads to calcium deposition in aorta, playing a key role in the pathological process of VC by mediating osteoblast differentiation factors.
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