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Kawakami K, Ohya M, Yashiro M, Sonou T, Yamamoto S, Nakashima Y, Yano T, Tanaka Y, Ishida K, Kobashi S, Shigematsu T, Araki SI. Bisphosphonate FYB-931 Prevents High Phosphate-Induced Vascular Calcification in Rat Aortic Rings by Altering the Dynamics of the Transformation of Calciprotein Particles. Calcif Tissue Int 2023:10.1007/s00223-023-01086-z. [PMID: 37099142 DOI: 10.1007/s00223-023-01086-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Accepted: 04/15/2023] [Indexed: 04/27/2023]
Abstract
Patients with chronic kidney disease develop vascular calcification, owing to impaired calcium and phosphate metabolism. The prevention of vascular calcification is important to improve the prognosis of such patients. In this study, we investigated whether treatment with FYB-931, a novel bisphosphonate compound, prevents vascular calcification in rat aortic rings cultured in high-phosphate medium for 9 days, assessed by measurement of the calcium content and the degree of calcium deposition, visualized using von Kossa staining. The effect on the transformation of calciprotein particles (CPPs) from primary to secondary CPPs was assessed using a fluorescent probe-based flow cytometric assay. FYB-931 dose-dependently prevented high phosphate-induced aortic calcification, but failed to rapidly cause the regression of high phosphate-induced vascular calcification once it had developed. Furthermore, the treatment dose-dependently inhibited the high phosphate-induced transformation from primary to secondary CPPs. In addition, the treatment with FYB-931 prevented the transformation from primary to secondary CPPs in vitamin D3-treated rats as a model of ectopic calcification, consistent with the results from rat aortic rings. In conclusion, treatment with FYB-931 prevents high phosphate-induced rat aortic vascular calcification by altering the dynamics of CPP transformation. This finding suggests that inhibition of the transformation from primary to secondary CPPs is an important target for the prevention of vascular calcification in patients with chronic kidney disease.
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Affiliation(s)
- Kazuki Kawakami
- Department of Nephrology, Wakayama Medical University, 811-1 Kimiidera, Wakayama, Wakayama, 641-8509, Japan
| | - Masaki Ohya
- Department of Nephrology, Wakayama Medical University, 811-1 Kimiidera, Wakayama, Wakayama, 641-8509, Japan.
| | - Mitsuru Yashiro
- Department of Nephrology, Wakayama Medical University, 811-1 Kimiidera, Wakayama, Wakayama, 641-8509, Japan
| | - Tomohiro Sonou
- Department of Nephrology, Wakayama Medical University, 811-1 Kimiidera, Wakayama, Wakayama, 641-8509, Japan
| | - Shuto Yamamoto
- Department of Nephrology, Wakayama Medical University, 811-1 Kimiidera, Wakayama, Wakayama, 641-8509, Japan
| | - Yuri Nakashima
- Department of Nephrology, Wakayama Medical University, 811-1 Kimiidera, Wakayama, Wakayama, 641-8509, Japan
| | - Takuro Yano
- Department of Nephrology, Wakayama Medical University, 811-1 Kimiidera, Wakayama, Wakayama, 641-8509, Japan
| | - Yusuke Tanaka
- Department of Nephrology, Wakayama Medical University, 811-1 Kimiidera, Wakayama, Wakayama, 641-8509, Japan
| | - Koichi Ishida
- Medical R&D Division, Fuji Yakuhin Co. Ltd, Laboratory 2, Iidashinden, Nishi-ku, Saitama, Saitama, 331-0068, Japan
| | - Seiichi Kobashi
- Medical R&D Division, Fuji Yakuhin Co. Ltd, Laboratory 1, Nishiomiya, Nishi-ku, Saitama, Saitama, 331-0078, Japan
| | - Takashi Shigematsu
- Department of Nephrology, Wakayama Medical University, 811-1 Kimiidera, Wakayama, Wakayama, 641-8509, Japan
- Department of Nephrology, Rinku General Medical Center, Izumisano, Osaka, 598-8577, Japan
| | - Shin-Ichi Araki
- Department of Nephrology, Wakayama Medical University, 811-1 Kimiidera, Wakayama, Wakayama, 641-8509, Japan
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Yashiro M, Ohya M, Mima T, Nakashima Y, Kawakami K, Sonou T, Tatsuta K, Yamano Y, Negi S, Shigematsu T. Excessive ADAM17 activation occurs in uremic patients and may contribute to their immunocompromised status. Immun Inflamm Dis 2020; 8:228-235. [PMID: 32180373 PMCID: PMC7212198 DOI: 10.1002/iid3.298] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 02/26/2020] [Accepted: 03/01/2020] [Indexed: 01/10/2023]
Abstract
Introduction We previously reported that fibroblast growth factor 23 (FGF23)‐klotho signaling plays a role in B cell immunity. Despite high serum levels of FGF23, a decline in immunity is frequently observed in patients on hemodialysis (HD); thus, abnormalities in the FGF23‐klotho signaling pathway in immune cells may occur in these patients. Methods We analyzed the number of klotho‐positive cells in peripheral blood mononuclear cells from 10 male and 6 female patients on HD and 5 healthy male subjects using flow cytometry. We analyzed the abundance of cleaved klotho protein in the murine B cell line, A20, and in the serum of HD patients and healthy subjects (HS) using flow cytometry and Western blotting. The serum level of A disintegrin and metalloprotease 17 (ADAM17) was measured in HD patients and HS using enzyme‐linked immunosorbent assay. Results The number of klotho‐positive B cells was reduced in HD patients. Serum ADAM17 was responsible for the reduction in klotho, as a specific ADAM17 inhibitor reversed this change. The total serum levels of ADAM17 were similar in HD patients and HS; however, activated ADAM17 was increased in the serum of HD patients. Conclusions We concluded that abnormal ADAM17 activation could contribute to the immunocompromised status in patients on HD, in line with the reported role of ADAM17 as an anti‐inflammatory and immunosuppressive factor.
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Affiliation(s)
- Mitsuru Yashiro
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Masaki Ohya
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Toru Mima
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Yuri Nakashima
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Kazuki Kawakami
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Tomohiro Sonou
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Koichi Tatsuta
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Yukiko Yamano
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Shigeo Negi
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
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Iwashita Y, Ohya M, Yashiro M, Sonou T, Kawakami K, Nakashima Y, Yano T, Iwashita Y, Mima T, Negi S, Kubo K, Tomoda K, Odamaki T, Shigematsu T. Dietary Changes Involving Bifidobacterium longum and Other Nutrients Delays Chronic Kidney Disease Progression. Am J Nephrol 2018; 47:325-332. [PMID: 29779028 DOI: 10.1159/000488947] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Accepted: 03/28/2018] [Indexed: 01/01/2023]
Abstract
BACKGROUND Recent studies suggest that prebiotic and/or probiotic treatments ameliorate kidney function in humans and animals by improving the gut environment. However, the gut microbiota and kidney disease interactions remain to be determined. This study investigated whether synbiotics modulate the gut microbiota and ameliorate kidney function using a rat model of chronic kidney disease (CKD). As uremic toxins are associated with CKD-related mineral and bone disorder, the secondary aim was to evaluate the relationship between synbiotics and secondary hyperparathyroidism (SHPT). METHODS 5/6 nephrectomy (Nx) rats were developed as the CKD model. Sham-operated (sham) rats were used as the control. To investigate the effectiveness of prebiotics (glutamine, dietary fiber, and oligosaccharide) and probiotics (Bifidobacterium longum strain; GFOB diet), rats were randomly assigned to 4 groups: Nx group fed the GFOB diet (n = 10); Nx group fed the control (CON) diet (n = 10); sham group fed the GFOB diet (n = 5); and sham group fed the control diet (n = 5). Blood, feces, and kidney samples were collected and analyzed. RESULTS Serum creatinine (Cre) and blood urea nitrogen in the Nx GFOB group were significantly lower than those in the Nx CON group. Serum indoxyl sulfate in the Nx GFOB group was lower than that in the Nx CON group, and significantly correlated with serum Cre. Inorganic phosphorus and intact parathyroid hormone in the Nx GFOB group were significantly lower than those in the Nx CON group. CONCLUSION Improving the gut environment using synbiotics ameliorated kidney function and might be a pharmacological treatment for SHPT without any serious adverse events.
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Affiliation(s)
- Yuko Iwashita
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Masaki Ohya
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Mitsuru Yashiro
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Tomohiro Sonou
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Kazuki Kawakami
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Yuri Nakashima
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Takuro Yano
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Yu Iwashita
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Toru Mima
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Shigeo Negi
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Kaoru Kubo
- Laboratory Animal Research Center, Nara Medical University, Kashihara, Japan
| | - Koichi Tomoda
- Second Department of Internal Medicine, Nara Medical University, Kashihara, Japan
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Yashiro M, Ohya M, Mima T, Ueda Y, Nakashima Y, Kawakami K, Ishizawa Y, Yamamoto S, Kobayashi S, Yano T, Tanaka Y, Okuda K, Sonou T, Shoshihara T, Iwashita Y, Iwashita Y, Tatsuta K, Matoba R, Negi S, Shigematsu T. FGF23 modulates the effects of erythropoietin on gene expression in renal epithelial cells. Int J Nephrol Renovasc Dis 2018; 11:125-136. [PMID: 29670389 PMCID: PMC5894721 DOI: 10.2147/ijnrd.s158422] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Background FGF23 plays an important role in calcium–phosphorus metabolism. Other roles of FGF23 have recently been reported, such as commitment to myocardium enlargement and immunological roles in the spleen. In this study, we aimed to identify the roles of FGF23 in the kidneys other than calcium–phosphorus metabolism. Methods DNA microarrays and bioinformatics tools were used to analyze gene expression in mIMCD3 mouse renal tubule cells following treatment with FGF23, erythropoietin and/or an inhibitor of ERK. Results Three protein-coding genes were upregulated and 12 were downregulated in response to FGF23. Following bioinformatics analysis of these genes, PPARγ and STAT3 were identified as candidate transcript factors for mediating their upregulation, and STAT1 as a candidate for mediating their downregulation. Because STAT1 and STAT3 also mediate erythropoietin signaling, we investigated whether FGF23 and erythropoietin might show interactive effects in these cells. Of the 15 genes regulated by FGF23, 11 were upregulated by erythropoietin; 10 of these were downregulated following cotreatment with FGF23. Inhibition of ERK, an intracellular mediator of FGF23, reversed the effects of FGF23. However, FGF23 did not influence STAT1 phosphorylation, suggesting that it impinges on erythropoietin signaling through other mechanisms. Conclusion Our results suggest cross talk between erythropoietin and FGF23 signaling in the regulation of renal epithelial cells.
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Affiliation(s)
- Mitsuru Yashiro
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Masaki Ohya
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Toru Mima
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Yumi Ueda
- DNA Chip Research Inc., Minato, Japan
| | - Yuri Nakashima
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Kazuki Kawakami
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | | | - Shuto Yamamoto
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Sou Kobayashi
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Takurou Yano
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Yusuke Tanaka
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Kouji Okuda
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Tomohiro Sonou
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | | | - Yuko Iwashita
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Yu Iwashita
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | - Kouichi Tatsuta
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
| | | | - Shigeo Negi
- Department of Nephrology, Wakayama Medical University, Wakayama, Japan
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Ohya M, Yashiro M, Sonou T, Okuda K, Tatsuta K, Mima T, Tone Y, Negi S, Saika Y, Shigematsu T. Intravenous Maxacalcitol Therapy Correlates with Serum Fibroblast Growth Factor 23 Levels in Hemodialysis Patients Independent of Serum Phosphate or Calcium Levels. Contributions to Nephrology 2018; 196:44-51. [DOI: 10.1159/000485696] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Sonou T, Ohya M, Yashiro M, Masumoto A, Nakashima Y, Ito T, Mima T, Negi S, Kimura-Suda H, Shigematsu T. Magnesium prevents phosphate-induced vascular calcification via TRPM7 and Pit-1 in an aortic tissue culture model. Hypertens Res 2017; 40:562-567. [DOI: 10.1038/hr.2016.188] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Revised: 12/06/2016] [Accepted: 12/08/2016] [Indexed: 11/09/2022]
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Nakashima Y, Mima T, Yashiro M, Sonou T, Ohya M, Masumoto A, Yamanaka S, Koreeda D, Tatsuta K, Hanba Y, Moribata M, Negi S, Shigematsu T. Expression and localization of fibroblast growth factor (FGF)23 and Klotho in the spleen: its physiological and functional implications. Growth Factors 2016; 34:196-202. [PMID: 28095739 DOI: 10.1080/08977194.2016.1273222] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The FGF23-Klotho signaling axis is known to exert anti-aging effects via calcium-phosphorus metabolism. In mice deficient in FGF23-Klotho signaling, however, the number of splenocytes is reduced. FGF23 is expressed in both bone and spleen, with regulation of its production differing in these organs. As FGF23-Klotho signaling may play an immunological role in the spleen, splenocytes in male C57BL/6J mice were assayed for expression of Klotho or FGF23 by flow cytometry and immunohistochemistry. Cells that expressed Klotho included CD45R/B220+ CD21/CD35+ CD1d+ CD43- marginal zone B cells. These cells also expressed FGF receptor 1, indicating that Klotho-positive B cells could respond to FGF23. Plasmacytoid dendritic cells (pDCs) with CD11c+ CD45R/B220+ CD11b- CD8α- were found to produce FGF23. Klotho-positive cells and FGF23-producing cells were present in close proximity to each other, suggesting that FGF23 produced by pDCs may act within a limited area. These findings indicate that FGF23-Klotho signaling could play a biological or immunological role in the spleen.
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Affiliation(s)
- Yuri Nakashima
- a Department of Nephrology , Wakayama Medical University , Wakayama , Japan
| | - Toru Mima
- a Department of Nephrology , Wakayama Medical University , Wakayama , Japan
| | - Mitsuru Yashiro
- a Department of Nephrology , Wakayama Medical University , Wakayama , Japan
| | - Tomohiro Sonou
- a Department of Nephrology , Wakayama Medical University , Wakayama , Japan
| | - Masaki Ohya
- a Department of Nephrology , Wakayama Medical University , Wakayama , Japan
| | - Asuka Masumoto
- a Department of Nephrology , Wakayama Medical University , Wakayama , Japan
| | - Shintaro Yamanaka
- a Department of Nephrology , Wakayama Medical University , Wakayama , Japan
| | - Daisuke Koreeda
- a Department of Nephrology , Wakayama Medical University , Wakayama , Japan
| | - Koichi Tatsuta
- a Department of Nephrology , Wakayama Medical University , Wakayama , Japan
| | - Yoshiyuki Hanba
- a Department of Nephrology , Wakayama Medical University , Wakayama , Japan
| | - Mari Moribata
- a Department of Nephrology , Wakayama Medical University , Wakayama , Japan
| | - Shigeo Negi
- a Department of Nephrology , Wakayama Medical University , Wakayama , Japan
| | - Takashi Shigematsu
- a Department of Nephrology , Wakayama Medical University , Wakayama , Japan
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Masumoto A, Sonou T, Ohya M, Yashiro M, Nakashima Y, Okuda K, Iwashita Y, Mima T, Negi S, Shigematsu T. Calcium Overload Accelerates Phosphate-Induced Vascular Calcification Via Pit-1, but not the Calcium-Sensing Receptor. J Atheroscler Thromb 2016; 24:716-724. [PMID: 27840385 PMCID: PMC5517545 DOI: 10.5551/jat.36574] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Aim: Vascular calcification (VC) is a risk factor of cardiovascular and all-cause mortality in patients with chronic kidney disease (CKD). CKD–mineral and bone metabolism disorder is an important problem in patients with renal failure. Abnormal levels of serum phosphate and calcium affect CKD–mineral and bone metabolism disorder and contribute to bone disease, VC, and cardiovascular disease. Hypercalcemia is a contributing factor in progression of VC in patients with CKD. However, the mechanisms of how calcium promotes intracellular calcification are still unclear. This study aimed to examine the mechanisms underlying calcium-induced calcification in a rat aortic tissue culture model. Methods: Aortic segments from 7-week-old male Sprague–Dawley rats were cultured in serum-supplemented medium for 10 days. We added high calcium (HiCa; calcium 3.0 mM) to high phosphate (HPi; phosphate 3.8 mM) medium to accelerate phosphate and calcium-induced VC. We used phosphonoformic acid and the calcimimetic R-568 to determine whether the mechanism of calcification involves Pit-1 or the calcium-sensing receptor. Results: Medial VC was significantly augmented by HPi+HiCa medium compared with HPi alone (300%, p < 0.05), and was associated with upregulation of Pit-1 protein. Pit-1 protein concentrations in HPi+HiCa medium were greater than those in HPi medium. Phosphonoformic acid completely negated the augmentation of medial VC induced by HPi+HiCa. R-568 had no additive direct effect on medial VC. Conclusion: These results indicated that exposure to HPi+HiCa accelerates medial VC, and this is mediated through Pit-1, not the calcium-sensing receptor.
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Affiliation(s)
- Asuka Masumoto
- Division of Nephrology, Department of Internal Medicine, Wakayama Medical University
| | - Tomohiro Sonou
- Division of Nephrology, Department of Internal Medicine, Wakayama Medical University
| | - Masaki Ohya
- Division of Nephrology, Department of Internal Medicine, Wakayama Medical University
| | - Mitsuru Yashiro
- Division of Nephrology, Department of Internal Medicine, Wakayama Medical University
| | - Yuri Nakashima
- Division of Nephrology, Department of Internal Medicine, Wakayama Medical University
| | - Kouji Okuda
- Division of Nephrology, Department of Internal Medicine, Wakayama Medical University
| | - Yuko Iwashita
- Division of Nephrology, Department of Internal Medicine, Wakayama Medical University
| | - Toru Mima
- Division of Nephrology, Department of Internal Medicine, Wakayama Medical University
| | - Shigeo Negi
- Division of Nephrology, Department of Internal Medicine, Wakayama Medical University
| | - Takashi Shigematsu
- Division of Nephrology, Department of Internal Medicine, Wakayama Medical University
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Sonou T, Ohya M, Yashiro M, Masumoto A, Nakashima Y, Ito T, Mima T, Negi S, Kimura-Suda H, Shigematsu T. Mineral Composition of Phosphate-Induced Calcification in a Rat Aortic Tissue Culture Model. J Atheroscler Thromb 2015; 22:1197-206. [PMID: 26119071 DOI: 10.5551/jat.28647] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
AIM High phosphorus conditions promote vascular calcification (VC) in both chronic kidney disease (CKD) patients and experimental models. However, the composition of medial calcification has not been accurately determined, so the objective of this study was to evaluate the mineral composition of calcification in a tissue culture model, not a cell culture system. METHODS Aortic rings obtained from male Sprague-Dawley rats were incubated in serum-supplemented medium for 10 days. The inorganic phosphate (Pi) concentration of the medium was increased to induce VC, which was assessed by histology, imaging, and spectroscopy. The mineral composition of the calcification was analyzed using Fourier transform infrared (FTIR) spectroscopic imaging, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX) mapping. RESULTS The calcium content significantly increased only in aortic rings cultured for 10 days in the high-Pi medium (HiP: 3.8 mmol/L). The concentration of the phosphate transporter Pit-1 in the aortic tissue exposed to HiP was higher than that in the control incubated sections. The FTIR images and spectra indicated that PO4(3-) was mostly distributed as hydroxyapatite in the medial calcification of aortic rings cultured in HiP. A small quantity of carbonate was identified. The SEM-EDX overlay map demonstrated that phosphorus and calcium simultaneously accumulated and localized in the area of medial calcification induced by exposure to HiP. CONCLUSION This is the first report of accurate determination of the chemical composition of aortic medial calcification. Exposure to high Pi concentration augments aortic calcification via an increase in Pit-1, which mainly contains calcium phosphate.
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Affiliation(s)
- Tomohiro Sonou
- Division of Nephrology, Department of Internal Medicine, Wakayama Medical University
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Tanaka C, Fujii T, Nakashima A, Xu M, Sonou T, Okamura K. Increasing the meal frequency does not promote exercise‐induced muscle hypertrophy in rats. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.631.12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Takako Fujii
- Osaka University of Health and Sport ScienceOsakaJapan
| | | | - Minjun Xu
- Osaka University of Health and Sport ScienceOsakaJapan
| | | | - Koji Okamura
- Osaka University of Health and Sport ScienceOsakaJapan
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Fujii T, Nakashima A, Xu M, Sonou T, Matsuo T, Okamura K. Post‐exercise meal timing does not influence hemoglobin synthesis in iron deficient rats. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.634.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Takako Fujii
- Osaka University of Health and Sport ScienceOsakaJapan
| | | | - Minjun Xu
- Osaka University of Health and Sport ScienceOsakaJapan
| | | | | | - Koji Okamura
- Osaka University of Health and Sport ScienceOsakaJapan
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Minjun X, Sonou T, Fujii T, Nakashima A, Tanaka C, Okamura K. Effects of a high fat or a high carbohydrate diet and exercise on energy substrate utilization in rat brain. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.1082.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xu Minjun
- Osaka University of Health and Sport SciencesOsakaJapan
| | | | - Takako Fujii
- Osaka University of Health and Sport SciencesOsakaJapan
| | | | | | - Koji Okamura
- Osaka University of Health and Sport SciencesOsakaJapan
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Okamura K, Nakashima A, Fujii T, Xu M, Tanaka C, Sonou T. Energy debt for body weight reduction depends on the body fat before reduction in rats. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.854.6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | - Minjun Xu
- Osaka Univ Health Sport SciKumatoriJapan
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Nishijima R, Sonou T, Matsuda M, Muramoto T, Hirano R, Iwata M, Okamura K. Theoretical calculation of body composition changes after body mass reduction in humans. FASEB J 2011. [DOI: 10.1096/fasebj.25.1_supplement.lb183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | | | | | - Masaru Iwata
- Osaka University of Health and Sport SciencesOsakaJapan
| | - Koji Okamura
- Osaka University of Health and Sport SciencesOsakaJapan
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Sonou T, Higuchi M, Terada S. An acute bout of high-intensity intermittent swimming induces glycogen supercompensation in rat skeletal muscle. Eur J Sport Sci 2008. [DOI: 10.1080/17461390802438755] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Sonou T, Terada S, Higuchi M. Effects Of Different Period Of Swimming-training On Glycogen Supercompensation In Rat Skeletal Muscle. Med Sci Sports Exerc 2005. [DOI: 10.1249/00005768-200505001-01605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Sonou T, Terada S, Nakamura Y, Muraoka I, Higuchi M. Effect of Different Types of Carbohydrate Supplementation on Glycogen Supercompensation in Rat Skeletal Muscle. Med Sci Sports Exerc 2004. [DOI: 10.1249/00005768-200405001-00094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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