1
|
Li B, Li J, Zhang Y, Chu Z, Zhang L, Ji Q. Dynamic changes of hepatic microenvironment related to graft function in donation after cardiac death liver transplantation. Eur J Radiol 2022; 154:110424. [DOI: 10.1016/j.ejrad.2022.110424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 05/31/2022] [Accepted: 06/22/2022] [Indexed: 11/30/2022]
|
2
|
Li P, Hidaka M, Huang Y, Hara T, Nagakawa K, Matsushima H, Tanaka T, Adachi T, Soyama A, Gu W, Kanetaka K, Eguchi S. Early graft calcification without graft dysfunction after living donor liver transplantation: two case reports. Clin J Gastroenterol 2021; 14:1491-1495. [PMID: 34423381 PMCID: PMC8437913 DOI: 10.1007/s12328-021-01471-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Accepted: 06/21/2021] [Indexed: 11/26/2022]
Abstract
Graft calcification after liver transplantation (LT) has seldom been reported, but almost of all previously reported cases have been attributed to graft dysfunction. We herein report two cases of graft calcification without liver dysfunction after living donor liver transplantation (LDLT). Two patients who underwent LDLT were found to have graft calcification in the early postoperative period (< 1 month). Calcification in the first case was found at the cut edge of the liver at post-operative day (POD) 10, showing a time-dependent increase in calcification severity. The second patient underwent hepatic artery re-anastomosis due to hepatic artery thrombosis on POD4 and received balloon-occluded retrograde transvenous obliteration of the splenic kidney shunt due to decreased portal vein blood flow on POD6. She was found to have diffuse hepatic calcification in the distant hepatic artery area at 1-month post-operation followed by gradual graft calcification at the resection margin at 6-month post-operation. Neither case showed post-operative graft dysfunction. Calcification of the liver graft after LDLT is likely rare, and graft calcification does not seem to affect the short-term liver function in LDLT cases. We recommend strictly controlling the warm/cold ischemia time and reducing the physical damage to the donor specimen as well as monitoring for early calcification by computed tomography.
Collapse
Affiliation(s)
- Peilin Li
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8102, Japan
- Department of Surgery, Guangzhou First People's Hospital, School of Medicine, South China University of Technology, Guangzhou, Guangdong, China
| | - Masaaki Hidaka
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8102, Japan
| | - Yu Huang
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8102, Japan
- Department of Surgery, Guangzhou First People's Hospital, School of Medicine, South China University of Technology, Guangzhou, Guangdong, China
| | - Takanobu Hara
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8102, Japan
| | - Kantoku Nagakawa
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8102, Japan
| | - Hajime Matsushima
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8102, Japan
| | - Takayuki Tanaka
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8102, Japan
| | - Tomohiko Adachi
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8102, Japan
| | - Akihiko Soyama
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8102, Japan
| | - Weili Gu
- Department of Surgery, Guangzhou First People's Hospital, School of Medicine, South China University of Technology, Guangzhou, Guangdong, China
| | - Kengo Kanetaka
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8102, Japan
| | - Susumu Eguchi
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8102, Japan.
| |
Collapse
|
3
|
Li W, Su SA, Chen J, Ma H, Xiang M. Emerging roles of fibroblasts in cardiovascular calcification. J Cell Mol Med 2020; 25:1808-1816. [PMID: 33369201 PMCID: PMC7882970 DOI: 10.1111/jcmm.16150] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 10/16/2020] [Accepted: 11/22/2020] [Indexed: 12/18/2022] Open
Abstract
Cardiovascular calcification, a kind of ectopic mineralization in cardiovascular system, including atherosclerotic calcification, arterial medial calcification, valve calcification and the gradually recognized heart muscle calcification, is a complex pathophysiological process correlated with poor prognosis. Although several cell types such as smooth muscle cells have been proven critical in vascular calcification, the aetiology of cardiovascular calcification remains to be clarified due to the diversity of cellular origin. Fibroblasts, which possess remarkable phenotypic plasticity that allows rapid adaption to fluctuating environment cues, have been demonstrated to play important roles in calcification of vasculature, valve and heart though our knowledge of the mechanisms controlling fibroblast phenotypic switching in the calcified process is far from complete. Indeed, the lack of definitive fibroblast lineage‐tracing studies and typical expression markers of fibroblasts raise major concerns regarding the contributions of fibroblasts during all the stages of cardiovascular calcification. The goal of this review was to rigorously summarize the current knowledge regarding possible phenotypes exhibited by fibroblasts within calcified cardiovascular system and evaluate the potential therapeutic targets that may control the phenotypic transition of fibroblasts in cardiovascular calcification.
Collapse
Affiliation(s)
- Wudi Li
- Department of Cardiology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Sheng-An Su
- Department of Cardiology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Jian Chen
- Department of Cardiology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Hong Ma
- Department of Cardiology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Meixiang Xiang
- Department of Cardiology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| |
Collapse
|
4
|
Souza TA, Bezerra MM, Silva PGB, Costa JJN, Carneiro RFLA, Barcelos JOF, Vasconcelos BC, Chaves HV. Bone morphogenetic proteins in biomineralization of two endodontic restorative cements. J Biomed Mater Res B Appl Biomater 2020; 109:348-357. [PMID: 32830897 DOI: 10.1002/jbm.b.34704] [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] [Received: 04/05/2020] [Revised: 07/16/2020] [Accepted: 08/04/2020] [Indexed: 01/01/2023]
Abstract
To assess the effect of biodentine (BD) and MTA-angelus (MTA) on biocompatibility, BMP2, BMP4, and osteocalcin (OC) expression. Subcutaneously implanted tubes of four groups (MTA, BD, Control, and Sham) were kept over 15, 30, and 60 days; histological analyses were performed using H&E and Von Kossa; ELISA quantified IL-1β and IL-8 expression; and qRT-PCR verified gene expression of BMPs and OC. Sham showed slight changes in profile/intensity of inflammatory infiltrate in all periods. Control had an inflammatory score significantly higher than Sham at 15 days (p < .05). BD revealed a similar inflammatory response to Sham, without significant changes over periods. MTA group exhibited an increase in chronic inflammatory profile at 30 days, with significant reduction at 60 days, when compared to Sham (p < .05). At 30/60 days, experimental groups presented birefringent areas. At 30/60 days, BD and MTA significantly increase IL-1β compared to Control, whereas an increase in IL-8 was observed only in BD. At 30/60 days, BD produces an expression of BMP2 whereas MTA influenced BMP4 and OC. Materials tested are biocompatible and they have osteoinductive activity; the materials influenced the expression of the tested mediators differently, suggesting different affinities with the substrate and the dental substrates.
Collapse
Affiliation(s)
- Tamara A Souza
- Graduate Program in Health Sciences, Federal University of Ceará-Campus Sobral, Sobral, Ceará, Brazil.,Graduate Program in Dentistry, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Mirna M Bezerra
- Graduate Program in Health Sciences, Federal University of Ceará-Campus Sobral, Sobral, Ceará, Brazil.,Medical School, Federal University of Ceará, Sobral, Ceará, Brazil
| | - Paulo G B Silva
- Graduate Program in Dentistry, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - José J N Costa
- Graduate Program in Health Sciences, Federal University of Ceará-Campus Sobral, Sobral, Ceará, Brazil
| | | | | | - Bruno C Vasconcelos
- Graduate Program in Dentistry, Federal University of Ceará, Fortaleza, Ceará, Brazil.,Dental School, Federal University of Ceará, Sobral, Ceará, Brazil
| | - Hellíada V Chaves
- Graduate Program in Health Sciences, Federal University of Ceará-Campus Sobral, Sobral, Ceará, Brazil.,Graduate Program in Dentistry, Federal University of Ceará, Fortaleza, Ceará, Brazil.,Dental School, Federal University of Ceará, Sobral, Ceará, Brazil
| |
Collapse
|
5
|
Li J, Jiang J, Chu Z, Zhang Y, Cai W, Zhu J, Grimm R, Ji Q. Multiparametric MRI Evaluation of Liposomal Prostaglandins E1 Intervention on Hepatic Warm Ischemia‐Reperfusion Injury in Rabbits. J Magn Reson Imaging 2019; 52:217-228. [PMID: 31829483 DOI: 10.1002/jmri.27022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2019] [Revised: 11/25/2019] [Accepted: 11/26/2019] [Indexed: 01/19/2023] Open
Affiliation(s)
- Jingyao Li
- First Central Clinical College of Tianjin Medical University Nankai DistrictTianjin China
- Department of RadiologyTianjin First Central Hospital Nankai DistrictTianjin China
| | - Jiabing Jiang
- First Central Clinical College of Tianjin Medical University Nankai DistrictTianjin China
- Department of RadiologyTianjin First Central Hospital Nankai DistrictTianjin China
| | - Zhiqiang Chu
- Department of TransplantationTianjin First Central Hospital Nankai DistrictTianjin China
| | - Yuling Zhang
- First Central Clinical College of Tianjin Medical University Nankai DistrictTianjin China
- Department of RadiologyTianjin First Central Hospital Nankai DistrictTianjin China
| | - Wenjuan Cai
- Department of PathologyTianjin First Central Hospital Nankai DistrictTianjin China
| | - Jinxia Zhu
- MR Collaboration, Siemens Healthcare Beijing China
| | | | - Qian Ji
- Department of RadiologyTianjin First Central Hospital Nankai DistrictTianjin China
| |
Collapse
|
6
|
Zhu C, Pongkitwitoon S, Qiu J, Thomopoulos S, Xia Y. Design and Fabrication of a Hierarchically Structured Scaffold for Tendon-to-Bone Repair. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1707306. [PMID: 29534316 PMCID: PMC6130203 DOI: 10.1002/adma.201707306] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 01/19/2018] [Indexed: 05/25/2023]
Abstract
A hierarchically structured scaffold is designed and fabricated for facilitating tendon-to-bone repair. The scaffold is composed of three regions with distinct functions: (i) an array of channels to guide the in-growth of cells and aligned deposition of collagen fibers, as well as integration of the scaffold with the tendon side, (ii) a region with a gradient in mineral composition to facilitate stress transfer between tendon and bone, and (iii) a mineralized inverse opal region to promote the integration of the scaffold with the underlying bone. Cell culture experiments confirm that adipose-derived stromal cells are able to infiltrate and proliferate through the entire thickness of the scaffold without compromised cell viability. The seeded stem cells exhibit directed differentiation into tenocytes and osteoblasts along the mineral gradient as a response to the gradient in Young's modulus. This novel scaffold holds great promise to promote the formation of a functional tendon-to-bone attachment by offering a structurally and compositionally appropriate microenvironment for healing.
Collapse
Affiliation(s)
- Chunlei Zhu
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, 30332, USA
| | | | - Jichuan Qiu
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, 30332, USA
| | - Stavros Thomopoulos
- Department of Orthopaedic Surgery, Columbia University, New York, NY, 10032, USA
- Department of Biomedical Engineering, Columbia University, New York, NY, 10027, USA
| | - Younan Xia
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, 30332, USA
- School of Chemistry and Biochemistry, School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| |
Collapse
|
7
|
Calcified desmoplastic fibroblastoma of the foot: imaging findings. Skeletal Radiol 2017; 46:565-569. [PMID: 28190096 DOI: 10.1007/s00256-017-2575-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Revised: 12/31/2016] [Accepted: 01/10/2017] [Indexed: 02/02/2023]
Abstract
We report a case of desmoplastic fibroblastoma (DF) of the foot in a 65-year-old woman. The tumor presented as a slow-growing, painless mass located in the first intermetatarsal space of the right foot. Ultrasound showed a well-circumscribed hypoechoic lesion containing hyperechoic calcifications confirmed on standard radiographs. At magnetic resonance imaging (MRI), the mass appeared isointense to the muscles on T1-weighted (T1W) images, hyperintense on proton-density-weighted fat-saturated images, and presented scattered internal hypointense foci. Post-contrast T1W spectral presaturation with inversion recovery (SPIR) images showed heterogeneous, mostly peripheral, contrast enhancement. DF must be considered in the differential diagnosis of soft-tissue calcified tumors of the foot.
Collapse
|
8
|
Turon P, Puiggalí J, Bertrán O, Alemán C. Surviving Mass Extinctions through Biomineralized DNA. Chemistry 2015; 21:18892-8. [DOI: 10.1002/chem.201503030] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2015] [Indexed: 11/10/2022]
Affiliation(s)
- Pau Turon
- Department of Research and Development, Regulatory Affairs and Quality Management, B. Braun Surgical, S.A. Ctra. de Terrassa, 121, 08191 Rubí, Barcelona (Spain)
| | - Jordi Puiggalí
- Departament d'Enginyeria Química, E.T.S. d'Enginyeria Industrial de Barcelona, Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona
- Center for Research in Nano‐Engineering, Universitat Politècnica de Catalunya, Campus Sud, Edifici C', C/Pasqual i Vila s/n, Barcelona 08028 (Spain)
| | - Oscar Bertrán
- Departament de Física Aplicada, EEI, Universitat Politècnica de Catalunya, Av. Pla de la Massa, 8, 08700 Igualada (Spain)
| | - Carlos Alemán
- Departament d'Enginyeria Química, E.T.S. d'Enginyeria Industrial de Barcelona, Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona
- Center for Research in Nano‐Engineering, Universitat Politècnica de Catalunya, Campus Sud, Edifici C', C/Pasqual i Vila s/n, Barcelona 08028 (Spain)
| |
Collapse
|
9
|
Le Naour F, Sandt C, Peng C, Trcera N, Chiappini F, Flank AM, Guettier C, Dumas P. In situ chemical composition analysis of cirrhosis by combining synchrotron fourier transform infrared and synchrotron X-ray fluorescence microspectroscopies on the same tissue section. Anal Chem 2012; 84:10260-6. [PMID: 23121424 DOI: 10.1021/ac302072t] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Liver is subject to various chronic pathologies, progressively leading to cirrhosis, which is associated with an increased risk of hepatocellular carcinoma. There is an urgent need for diagnostic and prognostic markers of chronic liver diseases and liver cancer. Spectroscopy-based approaches can provide an overview of the chemical composition of a tissue sample offering the possibility of investigating in depth the subtle chemical changes associated with pathological states. In this study, we have addressed the composition of cirrhotic liver tissue by combining synchrotron Fourier transform infrared (FTIR) microspectroscopy and synchrotron micro-X-ray fluorescence (XRF) on the same tissue section using a single sample holder in copper. This allowed investigation of the in situ biochemical as well as elemental composition of cells and tissues at high spatial resolution. Cirrhosis is characterized by regeneration nodules surrounded by annular fibrosis. Hepatocytes within cirrhotic nodules were characterized by high content in esters and sugars as well as in phosphorus and iron compared with fibrotic septa. A high heterogeneity was observed between cirrhotic nodules in their content in sugars and iron. On fibrosis, synchrotron XRF revealed enrichment in calcium compared to cirrhotic hepatocytes. Careful scrutiny of tissue sections led to detection of the presence of microcrystals that were demonstrated as precipitates of calcite using synchrotron FTIR. These results demonstrated that synchrotron FTIR and synchrotron XRF microspectroscopies provide complementary information on the chemical composition of cirrhotic hepatocytes and fibrotic septa in cirrhosis.
Collapse
|
10
|
Lind T, Hu L, Lind PM, Sugars R, Andersson G, Jacobson A, Melhus H. Microarray profiling of diaphyseal bone of rats suffering from hypervitaminosis A. Calcif Tissue Int 2012; 90:219-29. [PMID: 22215263 DOI: 10.1007/s00223-011-9561-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2011] [Accepted: 12/10/2011] [Indexed: 10/14/2022]
Abstract
Vitamin A is the only known compound that produces spontaneous fractures in rats. In an effort to resolve the molecular mechanism behind this effect, we fed young male rats high doses of vitamin A and performed microarray analysis of diaphyseal bone with and without marrow after 1 week, i.e., just before the first fractures appeared. Of the differentially expressed genes in cortical bone, including marrow, 98% were upregulated. In contrast, hypervitaminotic cortical bone without marrow showed reduced expression of 37% of differentially expressed genes. Gene ontology (GO) analysis revealed that only samples containing bone marrow were associated with a GO term, which principally represented extracellular matrix. This is consistent with the histological findings of increased endosteal/marrow osteoblast number. Fourteen genes, including Cyp26b1, which is known to be upregulated by vitamin A, were selected and verified by real-time PCR. In addition, immunohistochemical staining of bone sections confirmed that the bone-specific molecule osteoadherin was upregulated. Further analysis of the major gene-expression changes revealed apparent augmented Wnt signaling in the sample containing bone marrow but reduced Wnt signaling in cortical bone. Moreover, induced expression of hypoxia-associated genes was found only in samples containing bone marrow. Together, these results highlight the importance of compartment-specific analysis of bone and corroborate previous observations of compartment-specific effects of vitamin A, with reduced activity in cortical bone but increased activity in the endosteal/marrow compartment. We specifically identify potential key osteoblast-, Wnt signaling-, and hypoxia-associated genes in the processes leading to spontaneous fractures.
Collapse
Affiliation(s)
- Thomas Lind
- Department of Medical Sciences, Section of Clinical Pharmacology, Uppsala University, UAS, Ing 70 3tr Foa2 Lab22, 75185 Uppsala, Sweden.
| | | | | | | | | | | | | |
Collapse
|
11
|
Abstract
Calcific aortic valve stenosis (CAVS) is a major health problem facing aging societies. The identification of osteoblast-like and osteoclast-like cells in human tissue has led to a major paradigm shift in the field. CAVS was thought to be a passive, degenerative process, whereas now the progression of calcification in CAVS is considered to be actively regulated. Mechanistic studies examining the contributions of true ectopic osteogenesis, nonosseous calcification, and ectopic osteoblast-like cells (that appear to function differently from skeletal osteoblasts) to valvular dysfunction have been facilitated by the development of mouse models of CAVS. Recent studies also suggest that valvular fibrosis, as well as calcification, may play an important role in restricting cusp movement, and CAVS may be more appropriately viewed as a fibrocalcific disease. High-resolution echocardiography and magnetic resonance imaging have emerged as useful tools for testing the efficacy of pharmacological and genetic interventions in vivo. Key studies in humans and animals are reviewed that have shaped current paradigms in the field of CAVS, and suggest promising future areas for research.
Collapse
Affiliation(s)
- Jordan D Miller
- Department of Surgery, Mayo Clinic, Rochester, Minnesota 55905, USA.
| | | | | |
Collapse
|
12
|
Lind T, Lind PM, Jacobson A, Hu L, Sundqvist A, Risteli J, Yebra-Rodriguez A, Larsson S, Rodriguez-Navarro A, Andersson G, Melhus H. High dietary intake of retinol leads to bone marrow hypoxia and diaphyseal endosteal mineralization in rats. Bone 2011; 48:496-506. [PMID: 21035577 DOI: 10.1016/j.bone.2010.10.169] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2010] [Revised: 09/27/2010] [Accepted: 10/14/2010] [Indexed: 12/12/2022]
Abstract
Vitamin A (retinol) is the only molecule known to induce spontaneous fractures in laboratory animals and we have identified retinol as a risk factor for fracture in humans. Since subsequent observational studies in humans and old animal data both show that high retinol intake appears to only have small effects on bone mineral density (BMD) we undertook a mechanistic study of how excess retinol reduces bone diameter while leaving BMD essentially unaffected. We fed growing rats high doses of retinol for only 1 week. Bone analysis involved antibody-based methods, histology, pQCT, biomechanics and bone compartment-specific PCR together with Fourier Transform Infrared Spectroscopy of bone mineral. Excess dietary retinol induced weakening of bones with little apparent effect on BMD. Periosteal osteoclasts increased but unexpectedly endosteal osteoclasts disappeared and there was a reduction of osteoclastic serum markers. There was also a lack of capillary erythrocytes, endothelial cells and serum retinol transport protein in the endosteal/marrow compartment. A further indication of reduced endosteal/marrow blood flow was the increased expression of hypoxia-associated genes. Also, in contrast to the inhibitory effects in vitro, the marrow of retinol-treated rats showed increased expression of osteogenic genes. Finally, we show that hypervitaminotic bones have a higher degree of mineralization, which is in line with biomechanical data of preserved stiffness in spite of thinner bones. Together these novel findings suggest that a rapid primary effect of excess retinol on bone tissue is the impairment of endosteal/marrow blood flow leading to hypoxia and pathological endosteal mineralization.
Collapse
Affiliation(s)
- Thomas Lind
- Department of Medical Sciences, Section of Clinical Pharmacology, University Hospital, Uppsala, Sweden.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Talmon GA, Wisecarver JL. Hepatocellular Calcification in Severe Ischemia–Reperfusion Injury in a Liver Allograft. Ultrastruct Pathol 2010; 34:362-5. [DOI: 10.3109/01913123.2010.506254] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
14
|
Kalantari F, Auguste P, Ziafazeli T, Tzimas G, Malmström L, Bioulac-Sage P, Boismenu D, Vali H, Chevet E. Proteomics analysis of liver pathological calcification suggests a role for the IQ motif containing GTPase activating protein 1 in myofibroblast function. Proteomics Clin Appl 2009; 3:307-21. [PMID: 26238749 DOI: 10.1002/prca.200780133] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2007] [Indexed: 12/14/2022]
Abstract
To date the cellular and molecular mechanisms by which liver pathological calcifications occur and are regulated are poorly investigated. To study the mechanisms linked to their appearance, we performed a proteomics analysis of calcified liver samples. To this end, human liver biopsies collected in noncalcified (N), precalcified (P), and calcified (C) areas of the liver were subjected to weak ion exchange chromatography, SDS-PAGE, and LC-ESI MS/MS analyses. As we previously demonstrated that alpha-smooth muscle actin (α-SMA) expressing myofibroblasts were involved in liver pathological calcification, we performed a targeted analysis of actin cytoskeleton remodeling-related proteins. This revealed dramatic changes in protein expression patterns in the periphery of the calcified areas. More particularly, we found that IQGAP1 and IQGAP2 proteins were subjected to major expression changes. We show that IQGAP1 expression within P and C areas of the liver correlates with the high abundance of myofibroblasts and that IQGAP1 is specifically expressed in these cells. In addition, we find that IQGAP1 is part of a protein complex including β-catenin and Rac1 mainly in P and C regions of the liver. These results suggest that IQGAP1 may play a critical role in the regulation of cytoskeleton remodeling in liver myofibroblasts in response to liver injury and consequently impact on their function.
Collapse
Affiliation(s)
- Fariba Kalantari
- Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada
| | - Patrick Auguste
- Equipe Avenir, INSERM, Bordeaux, France. .,Université Bordeaux 2, Bordeaux, France. .,Université Bordeaux 1, Talence, France.
| | - Tahereh Ziafazeli
- Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada
| | - George Tzimas
- Department of Surgery, McGill University, Montreal, Quebec, Canada
| | - Lars Malmström
- Department of Medicinal Chemistry, University of Washington, Seattle, WA, USA
| | | | - Daniel Boismenu
- Montreal Proteomics Network, McGill University, Montreal, Quebec, Canada
| | - Hojatollah Vali
- Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada
| | - Eric Chevet
- Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada. .,Equipe Avenir, INSERM, Bordeaux, France. .,Université Bordeaux 2, Bordeaux, France. .,Department of Surgery, McGill University, Montreal, Quebec, Canada. .,Department of Medicinal Chemistry, University of Washington, Seattle, WA, USA. .,Montreal Proteomics Network, McGill University, Montreal, Quebec, Canada.
| |
Collapse
|