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Zhang B, Qu Z, Hui H, He B, Wang D, Zhang Y, Zhao Y, Zhang J, Yan L. Exploring the therapeutic potential of isoorientin in the treatment of osteoporosis: a study using network pharmacology and experimental validation. Mol Med 2024; 30:27. [PMID: 38378457 PMCID: PMC10880252 DOI: 10.1186/s10020-024-00799-7] [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: 05/24/2023] [Accepted: 02/13/2024] [Indexed: 02/22/2024] Open
Abstract
BACKGROUND Isoorientin (ISO) is a glycosylated flavonoid with antitumor, anti-inflammatory, and antioxidant properties. However, its effects on bone metabolism remain largely unknown. METHODS In this study, we aimed to investigate the effects of ISO on receptor activator of nuclear factor-κB ligand (RANKL)-induced osteoclast formation in vitro and bone loss in post-ovariectomy (OVX) rats, as well as to elucidate the underlying mechanism. First, network pharmacology analysis indicated that MAPK1 and AKT1 may be potential therapeutic targets of ISO and that ISO has potential regulatory effects on the mitogen-activated protein kinase (MAPK) and phosphoinositide 3-kinase (PI3K)/protein kinase B (AKT) pathways, as well as oxidative stress. ISO was added to RAW264.7 cells stimulated by RANKL, and its effects on osteoclast differentiation were evaluated using tartrate-resistant acid phosphatase (TRAP) staining, TRAP activity measurement, and F-actin ring analysis. Reactive oxygen species (ROS) production in osteoclasts was detected using a ROS assay kit. The effects of ISO on RANKL-triggered molecular cascade response were further investigated by Western blotting, quantitative real-time polymerase chain reaction, and immunofluorescence staining. In addition, the therapeutic effects of ISO were evaluated in vivo. RESULTS ISO inhibited osteoclastogenesis in a time- and concentration-dependent manner. Mechanistically, ISO downregulated the expression of the main transcription factor for osteoclast differentiation by inhibiting MAPK and PI3K/AKT1 signaling pathways. Moreover, ISO exhibited protective effects in OVX-induced bone loss rats. This was consistent with the results derived from network pharmacology. CONCLUSION Our findings suggest a potential therapeutic utility of ISO in the management of osteoclast-associated bone diseases, including osteoporosis.
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Affiliation(s)
- Bo Zhang
- Department of Spine Surgery, Honghui Hospital, Xi'an Jiaotong University, Xi'an, 710054, China
| | - Zechao Qu
- Department of Spine Surgery, Honghui Hospital, Xi'an Jiaotong University, Xi'an, 710054, China
| | - Hua Hui
- Department of Spine Surgery, Honghui Hospital, Xi'an Jiaotong University, Xi'an, 710054, China
| | - Baorong He
- Department of Spine Surgery, Honghui Hospital, Xi'an Jiaotong University, Xi'an, 710054, China
| | - Dong Wang
- Department of Spine Surgery, Honghui Hospital, Xi'an Jiaotong University, Xi'an, 710054, China
| | - Yong Zhang
- Department of Spine Surgery, Honghui Hospital, Xi'an Jiaotong University, Xi'an, 710054, China
| | - Yiwei Zhao
- Department of Spine Surgery, Honghui Hospital, Xi'an Jiaotong University, Xi'an, 710054, China
| | - Jingjun Zhang
- Health Science Center, Xi'an Jiaotong University, Xi'an, China
| | - Liang Yan
- Department of Spine Surgery, Honghui Hospital, Xi'an Jiaotong University, Xi'an, 710054, China.
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2
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Yao ZY, Fan SY, Song ZF, Li ZC. Network pharmacology-based and molecular docking-based analysis of You-Gui-Yin for the treatment of osteonecrosis of the femoral head. Medicine (Baltimore) 2023; 102:e35581. [PMID: 37904445 PMCID: PMC10615424 DOI: 10.1097/md.0000000000035581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Accepted: 09/19/2023] [Indexed: 11/01/2023] Open
Abstract
You-Gui-Yin (YGY) is a classic prescription for warming up kidney-Yang and filling in kidney essence in traditional Chinese medicine, and has been used to treat osteonecrosis of the femoral head (ONFH) effectively. However, the underlying mechanisms are still unknown. This study is aimed at exploring the possible mechanisms of action of the YGY in the treatment of ONFH based on network pharmacology and molecular docking. TCMSP was used to screen the active components and targets of YGY. The disease targets of ONFH were collected in several public databases. The protein-protein interaction (PPI) Network was constructed using the STRING platform. The Metascape database platform was used for Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) analyses. The key active components and core target proteins of YGY in the treatment of ONFH were verified by the molecular docking. 120 active components were obtained from YGY, among which 73 components were hit by the 117 drug-disease intersection targets. Key effective components included quercetin, kaempferol, beta-sitosterol, glycitein, beta-carotene, and so on. Core target proteins included ALB, AKT1, TNF, IL6, TP53, and so on. According to GO and KEGG analyses, there were 1762 biological processes, 94 cellular component, 138 molecular function and 187 signaling pathways involved. we selected the top 20 biological processes (BP), cellular components (CC), molecular functions (MF) and signaling pathways to draw the heat maps, showing that Lipid and atherosclerosis signaling pathway, IL-17 signaling pathway, HIF-1 signaling pathway, relaxin signaling pathway and MAPK signaling pathway and other pathways may play a key role in the treatment of ONFH by YGY. The results of molecular docking showed that key effective components and corresponding core target proteins exhibited the good binding activity. YGY can treat ONFH through multicomponents, multitargets, and multipathways, which provides a reference for the subsequent research, development of targeted drugs and clinical application.
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Affiliation(s)
- Zhi-Yuan Yao
- Department of Orthopedics, The First Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Provincial Hospital of Traditional Chinese Medicine), Hangzhou Economic and Technological Development Zone, Hangzhou, Zhejiang, China
| | - Shu-Yao Fan
- Department of Breast Surgery, The First Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Provincial Hospital of Traditional Chinese Medicine), Hangzhou Economic and Technological Development Zone, Hangzhou, Zhejiang, China
| | - Zhou-Feng Song
- Department of Orthopedics, The First Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Provincial Hospital of Traditional Chinese Medicine), Hangzhou Economic and Technological Development Zone, Hangzhou, Zhejiang, China
| | - Zhan-Chun Li
- Department of Orthopedics, The First Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Provincial Hospital of Traditional Chinese Medicine), Hangzhou Economic and Technological Development Zone, Hangzhou, Zhejiang, China
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3
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Sinibaldi R, Conti A, Sinjari B, Spadone S, Pecci R, Palombo M, Komlev VS, Ortore MG, Tromba G, Capuani S, Guidotti R, De Luca F, Caputi S, Traini T, Della Penna S. Multimodal-3D imaging based on μMRI and μCT techniques bridges the gap with histology in visualization of the bone regeneration process. J Tissue Eng Regen Med 2017; 12:750-761. [PMID: 28593731 DOI: 10.1002/term.2494] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Revised: 04/23/2017] [Accepted: 06/05/2017] [Indexed: 01/05/2023]
Abstract
Bone repair/regeneration is usually investigated through X-ray computed microtomography (μCT) supported by histology of extracted samples, to analyse biomaterial structure and new bone formation processes. Magnetic resonance imaging (μMRI) shows a richer tissue contrast than μCT, despite at lower resolution, and could be combined with μCT in the perspective of conducting non-destructive 3D investigations of bone. A pipeline designed to combine μMRI and μCT images of bone samples is here described and applied on samples of extracted human jawbone core following bone graft. We optimized the coregistration procedure between μCT and μMRI images to avoid bias due to the different resolutions and contrasts. Furthermore, we used an Adaptive Multivariate Clustering, grouping homologous voxels in the coregistered images, to visualize different tissue types within a fused 3D metastructure. The tissue grouping matched the 2D histology applied only on 1 slice, thus extending the histology labelling in 3D. Specifically, in all samples, we could separate and map 2 types of regenerated bone, calcified tissue, soft tissues, and/or fat and marrow space. Remarkably, μMRI and μCT alone were not able to separate the 2 types of regenerated bone. Finally, we computed volumes of each tissue in the 3D metastructures, which might be exploited by quantitative simulation. The 3D metastructure obtained through our pipeline represents a first step to bridge the gap between the quality of information obtained from 2D optical microscopy and the 3D mapping of the bone tissue heterogeneity and could allow researchers and clinicians to non-destructively characterize and follow-up bone regeneration.
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Affiliation(s)
- R Sinibaldi
- Department of Neuroscience, Imaging and Clinical Sciences, G. D'Annunzio University of Chieti-Pescara, Chieti, Italy
- Multimodal3D s.r.l., Rome, Italy
| | - A Conti
- Department of Neuroscience, Imaging and Clinical Sciences, G. D'Annunzio University of Chieti-Pescara, Chieti, Italy
| | - B Sinjari
- Department of Medical and Oral Sciences and Biotechnologies, G. D'Annunzio University of Chieti and Pescara, Chieti, Italy
| | - S Spadone
- Department of Neuroscience, Imaging and Clinical Sciences, G. D'Annunzio University of Chieti-Pescara, Chieti, Italy
| | - R Pecci
- Department of Technologies and Health, Istituto Superiore di Sanità, Rome, Italy
| | - M Palombo
- Department of Physics, Sapienza University of Rome, Rome, Italy
- CEA/DSV/I2BM, MIRCen, Fontenay-aux-Roses, France
| | - V S Komlev
- A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, Russian Federation
| | - M G Ortore
- Department of Life and Environmental Science, Marche Polytechnic University, Ancona, Italy
| | - G Tromba
- Elettra Sincrotrone Trieste, Trieste, Italy
| | - S Capuani
- CNR (Institute for Complex Systems) c/o Physics Department Sapienza University of Rome, Rome, Italy
| | - R Guidotti
- Department of Neuroscience, Imaging and Clinical Sciences, G. D'Annunzio University of Chieti-Pescara, Chieti, Italy
| | - F De Luca
- Department of Physics, Sapienza University of Rome, Rome, Italy
| | - S Caputi
- Department of Medical and Oral Sciences and Biotechnologies, G. D'Annunzio University of Chieti and Pescara, Chieti, Italy
| | - T Traini
- Department of Medical and Oral Sciences and Biotechnologies, G. D'Annunzio University of Chieti and Pescara, Chieti, Italy
| | - S Della Penna
- Department of Neuroscience, Imaging and Clinical Sciences, G. D'Annunzio University of Chieti-Pescara, Chieti, Italy
- Institute for Advanced Biomedical Technologies, G. D'Annunzio University of Chieti-Pescara, Chieti, Italy
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4
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Abubakar AA, Noordin MM, Azmi TI, Kaka U, Loqman MY. The use of rats and mice as animal models in ex vivo bone growth and development studies. Bone Joint Res 2016; 5:610-618. [PMID: 27965220 PMCID: PMC5227059 DOI: 10.1302/2046-3758.512.bjr-2016-0102.r2] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 10/06/2016] [Indexed: 01/09/2023] Open
Abstract
In vivo animal experimentation has been one of the cornerstones of biological and biomedical research, particularly in the field of clinical medicine and pharmaceuticals. The conventional in vivo model system is invariably associated with high production costs and strict ethical considerations. These limitations led to the evolution of an ex vivo model system which partially or completely surmounted some of the constraints faced in an in vivo model system. The ex vivo rodent bone culture system has been used to elucidate the understanding of skeletal physiology and pathophysiology for more than 90 years. This review attempts to provide a brief summary of the historical evolution of the rodent bone culture system with emphasis on the strengths and limitations of the model. It encompasses the frequency of use of rats and mice for ex vivo bone studies, nutritional requirements in ex vivo bone growth and emerging developments and technologies. This compilation of information could assist researchers in the field of regenerative medicine and bone tissue engineering towards a better understanding of skeletal growth and development for application in general clinical medicine.Cite this article: A. A. Abubakar, M. M. Noordin, T. I. Azmi, U. Kaka, M. Y. Loqman. The use of rats and mice as animal models in ex vivo bone growth and development studies. Bone Joint Res 2016;5:610-618. DOI: 10.1302/2046-3758.512.BJR-2016-0102.R2.
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Affiliation(s)
- A A Abubakar
- Department of Pre-Clinical Veterinary Sciences, Universiti Putra Malaysia, Malaysia
| | - M M Noordin
- Department of Pre-Clinical Veterinary Sciences, Universiti Putra Malaysia, Malaysia
| | - T I Azmi
- Department of Pre-Clinical Veterinary Sciences, Universiti Putra Malaysia, Malaysia
| | - U Kaka
- Department of Pre-Clinical Veterinary Sciences, Universiti Putra Malaysia, Malaysia
| | - M Y Loqman
- Department of Pre-Clinical Veterinary Sciences, Universiti Putra Malaysia, Malaysia
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5
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Vandoorne K, Vandsburger MH, Jacobs I, Han Y, Dafni H, Nicolay K, Strijkers GJ. Noninvasive mapping of endothelial dysfunction in myocardial ischemia by magnetic resonance imaging using an albumin-based contrast agent. NMR IN BIOMEDICINE 2016; 29:1500-1510. [PMID: 27604064 DOI: 10.1002/nbm.3599] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 07/10/2016] [Accepted: 07/18/2016] [Indexed: 05/28/2023]
Abstract
Noninvasive preclinical methods for the characterization of myocardial vascular function are crucial to an understanding of the dynamics of ischemic cardiac disease. Ischemic heart disease is associated with myocardial endothelial dysfunction, resulting in leakage of plasma albumin into the extravascular space. These features can be harnessed in a novel noninvasive three-dimensional magnetic resonance imaging method to measure fractional blood volume (fBV) and vascular permeability (permeability-surface area product, PS) using labeled albumin as a blood pool contrast agent. C57BL/6 mice were imaged before and 3 days after myocardial infarction (MI). Following the quantification of endogenous myocardial R1 , the dynamics of intravenously injected albumin-based contrast agent, extravasating from permeable myocardial blood vessels, were tracked on short-axis magnetic resonance images of the entire heart. This study successfully discriminated between infarcted and remote regions at 3 days post-infarct, based on a reduced fBV and increased PS in the infarcted region. These findings were confirmed using ex vivo fluorescence imaging and histology. We have demonstrated a novel method to quantify blood volume and permeability in the infarcted myocardium, providing an imaging biomarker for the assessment of endothelial dysfunction. This method has the potential to three-dimensionally visualize subtle changes in myocardial permeability and to track endothelial function for longitudinal cardiac studies determining pathophysiological processes during infarct healing.
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Affiliation(s)
- Katrien Vandoorne
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands.
| | | | - I Jacobs
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands
| | - Y Han
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands
| | - Hagit Dafni
- Department of Veterinary Resources, Weizmann Institute of Science, Rehovot, Israel
| | - Klaas Nicolay
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands
| | - Gustav J Strijkers
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands
- Biomedical Engineering and Physics, Academic Medical Center (AMC), Amsterdam, the Netherlands
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6
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Besio R, Maruelli S, Gioia R, Villa I, Grabowski P, Gallagher O, Bishop NJ, Foster S, De Lorenzi E, Colombo R, Diaz JLD, Moore-Barton H, Deshpande C, Aydin HI, Tokatli A, Kwiek B, Kasapkara CS, Adisen EO, Gurer MA, Di Rocco M, Phang JM, Gunn TM, Tenni R, Rossi A, Forlino A. Lack of prolidase causes a bone phenotype both in human and in mouse. Bone 2015; 72:53-64. [PMID: 25460580 DOI: 10.1016/j.bone.2014.11.009] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Revised: 10/29/2014] [Accepted: 11/14/2014] [Indexed: 12/22/2022]
Abstract
The degradation of the main fibrillar collagens, collagens I and II, is a crucial process for skeletal development. The most abundant dipeptides generated from the catabolism of collagens contain proline and hydroxyproline. In humans, prolidase is the only enzyme able to hydrolyze dipeptides containing these amino acids at their C-terminal end, thus being a key player in collagen synthesis and turnover. Mutations in the prolidase gene cause prolidase deficiency (PD), a rare recessive disorder. Here we describe 12 PD patients, 9 of whom were molecularly characterized in this study. Following a retrospective analysis of all of them a skeletal phenotype associated with short stature, hypertelorism, nose abnormalities, microcephaly, osteopenia and genu valgum, independent of both the type of mutation and the presence of the mutant protein was identified. In order to understand the molecular basis of the bone phenotype associated with PD, we analyzed a recently identified mouse model for the disease, the dark-like (dal) mutant. The dal/dal mice showed a short snout, they were smaller than controls, their femurs were significantly shorter and pQCT and μCT analyses of long bones revealed compromised bone properties at the cortical and at the trabecular level in both male and female animals. The differences were more pronounce at 1 month being the most parameters normalized by 2 months of age. A delay in the formation of the second ossification center was evident at postnatal day 10. Our work reveals that reduced bone growth was due to impaired chondrocyte proliferation and increased apoptosis rate in the proliferative zone associated with reduced hyperthrophic zone height. These data suggest that lack of prolidase, a cytosolic enzyme involved in the final stage of protein catabolism, is required for normal skeletogenesis especially at early age when the requirement for collagen synthesis and degradation is the highest.
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Affiliation(s)
- Roberta Besio
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Silvia Maruelli
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Roberta Gioia
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Isabella Villa
- Bone Metabolic Unit, San Raffaele Scientific Institute, Milan, Italy
| | | | | | | | | | | | | | - Josè Luis Dapena Diaz
- Pediatric Hematology and Oncology, Hospital Universitario Vall d'Hebron, Barcelona, Spain
| | - Haether Moore-Barton
- Department of Clinical Genetics, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Charu Deshpande
- Department of Clinical Genetics, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | | | - Aysegul Tokatli
- Department of Pediatrics, Hacettepe University, Ankara, Turkey
| | | | | | | | - Mehmet Ali Gurer
- Gazi University Hospital, Pediatric Metabolic Unit, Ankara, Turkey
| | - Maja Di Rocco
- Unit of Rare Diseases, Department of Pediatrics, Gaslini Institute, Genoa, Italy
| | - James M Phang
- Basic Research Laboratory, Center for Cancer Research, NCI at Frederick, Frederick, MD, USA
| | | | - Ruggero Tenni
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Antonio Rossi
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Antonella Forlino
- Department of Molecular Medicine, University of Pavia, Pavia, Italy.
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7
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Kaneshiro S, Ebina K, Shi K, Higuchi C, Hirao M, Okamoto M, Koizumi K, Morimoto T, Yoshikawa H, Hashimoto J. IL-6 negatively regulates osteoblast differentiation through the SHP2/MEK2 and SHP2/Akt2 pathways in vitro. J Bone Miner Metab 2014; 32:378-92. [PMID: 24122251 DOI: 10.1007/s00774-013-0514-1] [Citation(s) in RCA: 136] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2013] [Accepted: 08/07/2013] [Indexed: 11/26/2022]
Abstract
It has been suggested that interleukin-6 (IL-6)plays a key role in the pathogenesis of rheumatoid arthritis(RA), including osteoporosis not only in inflamed joints but also in the whole body. However, previous in vitro studies regarding the effects of IL-6 on osteoblast differentiation are inconsistent. The aim of this study was to examine the effects and signal transduction of IL-6 on osteoblast differentiation in MC3T3-E1 cells and primary murine calvarial osteoblasts. IL-6 and its soluble receptor significantly reduced alkaline phosphatase (ALP) activity, the expression of osteoblastic genes (Runx2, osterix, and osteocalcin), and mineralization in a dose-dependent manner, which indicates negative effects of IL-6 on osteoblast differentiation. Signal transduction studies demonstrated that IL-6 activated not only two major signaling pathways, SHP2/MEK/ERK and JAK/STAT3, but also the SHP2/PI3K/Akt2 signaling pathway. The negative effect of IL-6 on osteoblast differentiation was restored by inhibition of MEK as well as PI3K, while it was enhanced by inhibition of STAT3. Knockdown of MEK2 and Akt2 transfected with siRNA enhanced ALP activity and gene expression of Runx2. These results indicate that IL-6 negatively regulates osteoblast differentiation through SHP2/MEK2/ERK and SHP2/PI3K/Akt2 pathways, while affecting it positively through JAK/STAT3. Inhibition of MEK2 and Akt2 signaling in osteoblasts might be of potential use in the treatment of osteoporosis in RA.
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8
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Vandoorne K, Vandsburger MH, Weisinger K, Brumfeld V, Hemmings BA, Harmelin A, Neeman M. Multimodal imaging reveals a role for Akt1 in fetal cardiac development. Physiol Rep 2013; 1:e00143. [PMID: 24400145 PMCID: PMC3871458 DOI: 10.1002/phy2.143] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Revised: 10/07/2013] [Accepted: 10/08/2013] [Indexed: 12/29/2022] Open
Abstract
Even though congenital heart disease is the most prevalent malformation, little is known about how mutations affect cardiovascular function during development. Akt1 is a crucial intracellular signaling molecule, affecting cell survival, proliferation, and metabolism. The aim of this study was to determine the role of Akt1 on prenatal cardiac development. In utero echocardiography was performed in fetal wild-type, heterozygous, and Akt1-deficient mice. The same fetal hearts were imaged using ex vivo micro-computed tomography (μCT) and histology. Neonatal hearts were imaged by in vivo magnetic resonance imaging. Additional ex vivo neonatal hearts were analyzed using histology and real-time PCR of all three groups. In utero echocardiography revealed abnormal blood flow patterns at the mitral valve and reduced contractile function of Akt1 null fetuses, while ex vivo μCT and histology unraveled structural alterations such as dilated cardiomyopathy and ventricular septum defects in these fetuses. Further histological analysis showed reduced myocardial capillaries and coronary vessels in Akt1 null fetuses. At neonatal age, Akt1-deficient mice exhibited reduced survival with reduced endothelial cell density in the myocardium and attenuated cardiac expression of vascular endothelial growth factor A and collagen Iα1. To conclude, this study revealed a central role of Akt1 in fetal cardiac function and myocardial angiogenesis inducing fetal cardiomyopathy and reduced neonatal survival. This study links a specific physiological phenotype with a defined genotype, namely Akt1 deficiency, in an attempt to pinpoint intrinsic causes of fetal cardiomyopathies.
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Affiliation(s)
- Katrien Vandoorne
- Biological Regulation, Weizmann Institute of Science Rehovot, Israel ; Biomedical engineering, Eindhoven University of Technology Eindhoven, The Netherlands
| | | | - Karen Weisinger
- Biological Regulation, Weizmann Institute of Science Rehovot, Israel
| | - Vlad Brumfeld
- Chemical Research Support, Weizmann Institute of Science Rehovot, Israel
| | - Brian A Hemmings
- Friedrich Miescher Institute for Biomedical Research Basel, Switzerland
| | - Alon Harmelin
- Veterinary Resources, Weizmann Institute of Science Rehovot, Israel
| | - Michal Neeman
- Biological Regulation, Weizmann Institute of Science Rehovot, Israel
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9
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Vandoorne K, Vandsburger MH, Raz T, Shalev M, Weisinger K, Biton I, Brumfeld V, Raanan C, Nevo N, Eilam R, Hemmings BA, Tzahor E, Harmelin A, Gepstein L, Neeman M. Chronic Akt1 Deficiency Attenuates Adverse Remodeling and Enhances Angiogenesis After Myocardial Infarction. Circ Cardiovasc Imaging 2013; 6:992-1000. [DOI: 10.1161/circimaging.113.000828] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Katrien Vandoorne
- From the Department of Biological Regulation (K.V., M.H.V., T.R., M.S., K.W., N.N., E.T., M.N.), Department of Veterinary Resources (I.B., C.R., R.E., A.H.), and Department of Chemical Research Support (V.B.), Weizmann Institute of Science, Rehovot, Israel; Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands (K.V.); Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Rehovot, Israel (T.R.); Friedrich Miescher Institute for Biomedical Research,
| | - Moriel H. Vandsburger
- From the Department of Biological Regulation (K.V., M.H.V., T.R., M.S., K.W., N.N., E.T., M.N.), Department of Veterinary Resources (I.B., C.R., R.E., A.H.), and Department of Chemical Research Support (V.B.), Weizmann Institute of Science, Rehovot, Israel; Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands (K.V.); Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Rehovot, Israel (T.R.); Friedrich Miescher Institute for Biomedical Research,
| | - Tal Raz
- From the Department of Biological Regulation (K.V., M.H.V., T.R., M.S., K.W., N.N., E.T., M.N.), Department of Veterinary Resources (I.B., C.R., R.E., A.H.), and Department of Chemical Research Support (V.B.), Weizmann Institute of Science, Rehovot, Israel; Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands (K.V.); Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Rehovot, Israel (T.R.); Friedrich Miescher Institute for Biomedical Research,
| | - Moran Shalev
- From the Department of Biological Regulation (K.V., M.H.V., T.R., M.S., K.W., N.N., E.T., M.N.), Department of Veterinary Resources (I.B., C.R., R.E., A.H.), and Department of Chemical Research Support (V.B.), Weizmann Institute of Science, Rehovot, Israel; Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands (K.V.); Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Rehovot, Israel (T.R.); Friedrich Miescher Institute for Biomedical Research,
| | - Karen Weisinger
- From the Department of Biological Regulation (K.V., M.H.V., T.R., M.S., K.W., N.N., E.T., M.N.), Department of Veterinary Resources (I.B., C.R., R.E., A.H.), and Department of Chemical Research Support (V.B.), Weizmann Institute of Science, Rehovot, Israel; Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands (K.V.); Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Rehovot, Israel (T.R.); Friedrich Miescher Institute for Biomedical Research,
| | - Inbal Biton
- From the Department of Biological Regulation (K.V., M.H.V., T.R., M.S., K.W., N.N., E.T., M.N.), Department of Veterinary Resources (I.B., C.R., R.E., A.H.), and Department of Chemical Research Support (V.B.), Weizmann Institute of Science, Rehovot, Israel; Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands (K.V.); Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Rehovot, Israel (T.R.); Friedrich Miescher Institute for Biomedical Research,
| | - Vlad Brumfeld
- From the Department of Biological Regulation (K.V., M.H.V., T.R., M.S., K.W., N.N., E.T., M.N.), Department of Veterinary Resources (I.B., C.R., R.E., A.H.), and Department of Chemical Research Support (V.B.), Weizmann Institute of Science, Rehovot, Israel; Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands (K.V.); Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Rehovot, Israel (T.R.); Friedrich Miescher Institute for Biomedical Research,
| | - Calanit Raanan
- From the Department of Biological Regulation (K.V., M.H.V., T.R., M.S., K.W., N.N., E.T., M.N.), Department of Veterinary Resources (I.B., C.R., R.E., A.H.), and Department of Chemical Research Support (V.B.), Weizmann Institute of Science, Rehovot, Israel; Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands (K.V.); Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Rehovot, Israel (T.R.); Friedrich Miescher Institute for Biomedical Research,
| | - Nava Nevo
- From the Department of Biological Regulation (K.V., M.H.V., T.R., M.S., K.W., N.N., E.T., M.N.), Department of Veterinary Resources (I.B., C.R., R.E., A.H.), and Department of Chemical Research Support (V.B.), Weizmann Institute of Science, Rehovot, Israel; Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands (K.V.); Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Rehovot, Israel (T.R.); Friedrich Miescher Institute for Biomedical Research,
| | - Raya Eilam
- From the Department of Biological Regulation (K.V., M.H.V., T.R., M.S., K.W., N.N., E.T., M.N.), Department of Veterinary Resources (I.B., C.R., R.E., A.H.), and Department of Chemical Research Support (V.B.), Weizmann Institute of Science, Rehovot, Israel; Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands (K.V.); Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Rehovot, Israel (T.R.); Friedrich Miescher Institute for Biomedical Research,
| | - Brian A. Hemmings
- From the Department of Biological Regulation (K.V., M.H.V., T.R., M.S., K.W., N.N., E.T., M.N.), Department of Veterinary Resources (I.B., C.R., R.E., A.H.), and Department of Chemical Research Support (V.B.), Weizmann Institute of Science, Rehovot, Israel; Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands (K.V.); Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Rehovot, Israel (T.R.); Friedrich Miescher Institute for Biomedical Research,
| | - Eldad Tzahor
- From the Department of Biological Regulation (K.V., M.H.V., T.R., M.S., K.W., N.N., E.T., M.N.), Department of Veterinary Resources (I.B., C.R., R.E., A.H.), and Department of Chemical Research Support (V.B.), Weizmann Institute of Science, Rehovot, Israel; Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands (K.V.); Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Rehovot, Israel (T.R.); Friedrich Miescher Institute for Biomedical Research,
| | - Alon Harmelin
- From the Department of Biological Regulation (K.V., M.H.V., T.R., M.S., K.W., N.N., E.T., M.N.), Department of Veterinary Resources (I.B., C.R., R.E., A.H.), and Department of Chemical Research Support (V.B.), Weizmann Institute of Science, Rehovot, Israel; Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands (K.V.); Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Rehovot, Israel (T.R.); Friedrich Miescher Institute for Biomedical Research,
| | - Lior Gepstein
- From the Department of Biological Regulation (K.V., M.H.V., T.R., M.S., K.W., N.N., E.T., M.N.), Department of Veterinary Resources (I.B., C.R., R.E., A.H.), and Department of Chemical Research Support (V.B.), Weizmann Institute of Science, Rehovot, Israel; Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands (K.V.); Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Rehovot, Israel (T.R.); Friedrich Miescher Institute for Biomedical Research,
| | - Michal Neeman
- From the Department of Biological Regulation (K.V., M.H.V., T.R., M.S., K.W., N.N., E.T., M.N.), Department of Veterinary Resources (I.B., C.R., R.E., A.H.), and Department of Chemical Research Support (V.B.), Weizmann Institute of Science, Rehovot, Israel; Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands (K.V.); Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Rehovot, Israel (T.R.); Friedrich Miescher Institute for Biomedical Research,
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Selective signaling by Akt1 controls osteoblast differentiation and osteoblast-mediated osteoclast development. Mol Cell Biol 2011; 32:490-500. [PMID: 22064480 DOI: 10.1128/mcb.06361-11] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Maintaining optimal bone integrity, mass, and strength throughout adult life requires ongoing bone remodeling, which involves coordinated activity between actions of bone-resorbing osteoclasts and bone forming-osteoblasts. Osteoporosis is a disorder of remodeling in which bone resorption outstrips deposition, leading to diminished bone mass and an increased risk of fractures. Here we identify Akt1 as a unique signaling intermediate in osteoblasts that can control both osteoblast and osteoclast differentiation. Targeted knockdown of Akt1 in mouse primary bone marrow stromal cells or in a mesenchymal stem cell line or genetic knockout of Akt1 stimulated osteoblast differentiation secondary to increased expression of the osteogenic transcription factor Runx2. Despite enhanced osteoblast differentiation, coupled osteoclastogenesis in Akt1 deficiency was markedly inhibited, with reduced accumulation of specific osteoclast mRNAs and proteins and impaired fusion to form multinucleated osteoclasts, defects secondary to diminished production of receptor activator of NF-κB ligand (RANKL) and macrophage colony-stimulating factor (m-CSF), critical osteoblast-derived osteoclast differentiation factors. Delivery of recombinant lentiviruses encoding Akt1 but not Akt2 to Akt1-deficient osteoblast progenitors reversed the increased osteoblast differentiation and, by boosting accumulation of RANKL and m-CSF, restored normal osteoclastogenesis, as did the addition of recombinant RANKL to conditioned culture medium from Akt1-deficient osteoblasts. Our results support the idea that targeted inhibition of Akt1 could lead to therapeutically useful net bone acquisition, and they indicate that closely related Akt1 and Akt2 exert distinct effects on cellular differentiation pathways.
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Lindhurst MJ, Sapp JC, Teer JK, Johnston JJ, Finn EM, Peters K, Turner J, Cannons JL, Bick D, Blakemore L, Blumhorst C, Brockmann K, Calder P, Cherman N, Deardorff MA, Everman DB, Golas G, Greenstein RM, Kato BM, Keppler-Noreuil KM, Kuznetsov SA, Miyamoto RT, Newman K, Ng D, O'Brien K, Rothenberg S, Schwartzentruber DJ, Singhal V, Tirabosco R, Upton J, Wientroub S, Zackai EH, Hoag K, Whitewood-Neal T, Robey PG, Schwartzberg PL, Darling TN, Tosi LL, Mullikin JC, Biesecker LG. A mosaic activating mutation in AKT1 associated with the Proteus syndrome. N Engl J Med 2011; 365:611-9. [PMID: 21793738 PMCID: PMC3170413 DOI: 10.1056/nejmoa1104017] [Citation(s) in RCA: 587] [Impact Index Per Article: 45.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
BACKGROUND The Proteus syndrome is characterized by the overgrowth of skin, connective tissue, brain, and other tissues. It has been hypothesized that the syndrome is caused by somatic mosaicism for a mutation that is lethal in the nonmosaic state. METHODS We performed exome sequencing of DNA from biopsy samples obtained from patients with the Proteus syndrome and compared the resultant DNA sequences with those of unaffected tissues obtained from the same patients. We confirmed and extended an observed association, using a custom restriction-enzyme assay to analyze the DNA in 158 samples from 29 patients with the Proteus syndrome. We then assayed activation of the AKT protein in affected tissues, using phosphorylation-specific antibodies on Western blots. RESULTS Of 29 patients with the Proteus syndrome, 26 had a somatic activating mutation (c.49G→A, p.Glu17Lys) in the oncogene AKT1, encoding the AKT1 kinase, an enzyme known to mediate processes such as cell proliferation and apoptosis. Tissues and cell lines from patients with the Proteus syndrome harbored admixtures of mutant alleles that ranged from 1% to approximately 50%. Mutant cell lines showed greater AKT phosphorylation than did control cell lines. A pair of single-cell clones that were established from the same starting culture and differed with respect to their mutation status had different levels of AKT phosphorylation. CONCLUSIONS The Proteus syndrome is caused by a somatic activating mutation in AKT1, proving the hypothesis of somatic mosaicism and implicating activation of the PI3K-AKT pathway in the characteristic clinical findings of overgrowth and tumor susceptibility in this disorder. (Funded by the Intramural Research Program of the National Human Genome Research Institute.).
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Aychek T, Vandoorne K, Brenner O, Jung S, Neeman M. Quantitative analysis of intravenously administered contrast media reveals changes in vascular barrier functions in a murine colitis model. Magn Reson Med 2011; 66:235-43. [PMID: 21254214 DOI: 10.1002/mrm.22798] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Revised: 12/08/2010] [Accepted: 12/10/2010] [Indexed: 01/08/2023]
Abstract
Inflammatory bowel disease is a chronic inflammatory disorder of the gastrointestinal tract associated with alterations and dysfunction of the intestinal microvasculature. The goal of this work was to develop a preclinical protocol for quantitative functional characterization of the colonic microvasculature in a murine colitis model. Experimental colitis was induced in mice by addition of dextran sodium sulfate to the drinking water. Histopathologic analysis revealed severe multifocal colitis. Dynamics of intravenously injected macromolecular dextran-FITC and biotin-BSA-GdDTPA in the colonic microvasculature were imaged using fluorescent confocal endomicroscopy and MRI (9.4 T), respectively. Both MRI and fluorescent confocal endomicroscopy revealed a substantial increase in the permeability of the colonic microvasculature associated with colitis, resulting in extravascular accumulation of the macromolecular contrast agent in the lumen of the colon. MRI data were validated by immunohistochemical staining of the contrast agent and leakage of fluorescently labeled BSA-FAM coinjected with the MRI contrast agent. Leakage of plasma proteins and deposition of a provisional matrix can support inflammation and stimulate remodeling of the colonic vasculature. Thus, the plasma protein leakage from the colonic microvasculature at the focal inflammatory patches could be quantified by MRI, providing a biomarker for assessment of disease progression.
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Affiliation(s)
- Tegest Aychek
- Department of Immunology, The Weizmann Institute of Science, Rehovot, Israel
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13
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Plaks V, Berkovitz E, Vandoorne K, Berkutzki T, Damari GM, Haffner R, Dekel N, Hemmings BA, Neeman M, Harmelin A. Survival and size are differentially regulated by placental and fetal PKBalpha/AKT1 in mice. Biol Reprod 2010; 84:537-45. [PMID: 20980686 DOI: 10.1095/biolreprod.110.085951] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
The importance of placental circulation is exemplified by the correlation of placental size and blood flow with fetal weight and survival during normal and compromised human pregnancies in such conditions as preeclampsia and intrauterine growth restriction (IUGR). Using noninvasive magnetic resonance imaging, we evaluated the role of PKBalpha/AKT1, a major mediator of angiogenesis, on placental vascular function. PKBalpha/AKT1 deficiency reduced maternal blood volume fraction without affecting the integrity of the fetomaternal blood barrier. In addition to angiogenesis, PKBalpha/AKT1 regulates additional processes related to survival and growth. In accordance with reports in adult mice, we demonstrated a role for PKBalpha/AKT1 in regulating chondrocyte organization in fetal long bones. Using tetraploid complementation experiments with PKBalpha/AKT1-expressing placentas, we found that although placental PKBalpha/AKT1 restored fetal survival, fetal PKBalpha/AKT1 regulated fetal size, because tetraploid complementation did not prevent intrauterine growth retardation. Histological examination of rescued fetuses showed reduced liver blood vessel and renal glomeruli capillary density in PKBalpha/Akt1 null fetuses, both of which were restored by tetraploid complementation. However, bone development was still impaired in tetraploid-rescued PKBalpha/Akt1 null fetuses. Although PKBalpha/AKT1-expressing placentas restored chondrocyte cell number in the hypertrophic layer of humeri, fetal PKBalpha/AKT1 was found to be necessary for chondrocyte columnar organization. Remarkably, a dose-dependent phenotype was exhibited for PKBalpha/AKT1 when examining PKBalpha/Akt1 heterozygous fetuses as well as those complemented by tetraploid placentas. The differential role of PKBalpha/AKT1 on mouse fetal survival and growth may shed light on its roles in human IUGR.
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Affiliation(s)
- Vicki Plaks
- Biological Regulation, The Weizmann Institute of Science, Rehovot, Israel
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Vandoorne K, Addadi Y, Neeman M. Visualizing vascular permeability and lymphatic drainage using labeled serum albumin. Angiogenesis 2010; 13:75-85. [PMID: 20512410 DOI: 10.1007/s10456-010-9170-4] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2010] [Accepted: 05/14/2010] [Indexed: 12/21/2022]
Abstract
During the early stages of angiogenesis, following stimulation of endothelial cells by vascular endothelial growth factor (VEGF), the vascular wall is breached, allowing high molecular weight proteins to leak from the vessels to the interstitial space. This hallmark of angiogenesis results in deposition of a provisional matrix, elevation of the interstitial pressure and induction of interstitial convection. Albumin, the major plasma protein appears to be an innocent bystander that is significantly affected by these changes, and thus can be used as a biomarker for vascular permeability associated with angiogenesis. Traditionally, albumin leak in superficial organs was followed by colorimetry or morphometry with the use of albumin binding vital dyes. Over the last years, the introduction of tagged-albumin that can be detected by various imaging methods, such as magnetic resonance imaging and positron emission tomography, opened new possibilities for quantitative three dimension dynamic analysis of permeability in any organ. Using these tools it is now possible to follow not only vascular permeability, but also interstitial convection and lymphatic drain. Active uptake of tagged albumin by caveolae-mediated endocytosis opens the possibility for using labeled albumin for vital staining of cells and cell tracking. This approach was used for monitoring recruitment of perivascular stroma fibroblasts associated with tumor angiogenesis.
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Affiliation(s)
- Katrien Vandoorne
- Department of Biological Regulation, Weizmann Institute, Rehovot, 76100, Israel
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