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Walls GM, Ghita M, Herron B, Edgar KS, Kuburas R, Watson CJ, Grieve DJ, Cole AJ, Jain S, Butterworth KT. A multimodality assessment of the protective capacity of statin therapy in a mouse model of radiation cardiotoxicity. Radiother Oncol 2024; 190:110004. [PMID: 37972738 DOI: 10.1016/j.radonc.2023.110004] [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: 05/11/2023] [Revised: 11/08/2023] [Accepted: 11/09/2023] [Indexed: 11/19/2023]
Abstract
PURPOSE Despite technological advances in radiotherapy (RT), cardiotoxicity remains a common complication in patients with lung, oesophageal and breast cancers. Statin therapy has been shown to have pleiotropic properties beyond its lipid-lowering effects. Previous murine models have shown statin therapy can reduce short-term functional effects of whole-heart irradiation. In this study, we assessed the efficacy of atorvastatin in protecting against the late effects of radiation exposure on systolic function, cardiac conduction, and atrial natriuretic peptide (ANP) following a clinically relevant partial-heart radiation exposure. MATERIALS AND METHODS Female, 12-week old, C57BL/6j mice received an image-guided 16 Gy X-ray field to the base of the heart using a small animal radiotherapy research platform (SARRP), with or without atorvastatin from 1 week prior to irradiation until the end of the experiment. The animals were followed for 50 weeks with longitudinal transthoracic echocardiography (TTE) and electrocardiography (ECG) every 10 weeks, and plasma ANP every 20 weeks. RESULTS At 30-50 weeks, mild left ventricular systolic function impairment observed in the RT control group was less apparent in animals receiving atorvastatin. ECG analysis demonstrated prolongation of components of cardiac conduction related to the heart base at 10 and 30 weeks in the RT control group but not in animals treated with atorvastatin. In contrast to systolic function, conduction disturbances resolved at later time-points with radiation alone. ANP reductions were lower in irradiated animals receiving atorvastatin at 30 and 50 weeks. CONCLUSIONS Atorvastatin prevents left ventricular systolic dysfunction, and the perturbation of cardiac conduction following partial heart irradiation. If confirmed in clinical studies, these data would support the use of statin therapy for cardioprotection during thoracic radiotherapy.
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Affiliation(s)
- Gerard M Walls
- Cancer Centre Belfast City Hospital, Belfast Health & Social Care Trust, Lisburn Road, Belfast, UK; Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Jubilee Road, Belfast, UK.
| | - Mihaela Ghita
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Jubilee Road, Belfast, UK
| | - Brian Herron
- Department of Histopathology Royal Victoria Hospital, Belfast Health & Social Care Trust, Falls Road, Belfast, UK
| | - Kevin S Edgar
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, Jubilee Road, Belfast, UK
| | - Refik Kuburas
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Jubilee Road, Belfast, UK
| | - Chris J Watson
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, Jubilee Road, Belfast, UK
| | - David J Grieve
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, Jubilee Road, Belfast, UK
| | - Aidan J Cole
- Cancer Centre Belfast City Hospital, Belfast Health & Social Care Trust, Lisburn Road, Belfast, UK; Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Jubilee Road, Belfast, UK
| | - Suneil Jain
- Cancer Centre Belfast City Hospital, Belfast Health & Social Care Trust, Lisburn Road, Belfast, UK; Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Jubilee Road, Belfast, UK
| | - Karl T Butterworth
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Jubilee Road, Belfast, UK
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Hatayama Y, Kudo S, Ota R, Kuroki A, Tanaka M, Yotsuya C, Ichise K, Fujioka I, Sato M, Kawaguchi H, Aoki M. Investigation of the efficacy of the change ratio of brain natriuretic peptide for predicting the cardiac effects of chemoradiotherapy on esophageal cancer. Oncol Lett 2023; 26:439. [PMID: 37664653 PMCID: PMC10472025 DOI: 10.3892/ol.2023.14026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 07/03/2023] [Indexed: 09/05/2023] Open
Abstract
The aim of this study was to investigate the effectiveness of brain natriuretic peptide (BNP) as a predictor of radiological effects on the heart. A total of 41 patients with esophageal cancer who underwent chemoradiotherapy (CRT) were retrospectively investigated. The BNP levels were measured on the first day of CRT (pre-CRT) and the last day of CRT (post-CRT), and the median concentration of BNP and dosimetric parameters of the heart were calculated. The change ratio of BNP was calculated as follows: [(BNP post-CRT) - (BNP pre-CRT)]/(BNP pre-CRT). The comparison of BNP pre-CRT with post-CRT was performed using a Wilcoxon signed-rank test. The relationship between dosimetric parameters and change ratio was analyzed using Spearman's correlation coefficient. The median levels of BNP of pre-CRT and post-CRT were 10 and 22 pg/ml, respectively, and the difference was statistically significant (P<0.0001). Significant correlations (all P<0.05) were observed between the change ratio and mean dose, V5, V10, V20, and V30. Of the cohort, 14 patients developed acute-to-subacute cardiac events, such as pericardial effusion, cardiomegaly, acute exacerbation of chronic heart failure, and a decreased ejection fraction. The change ratios of BNP, V5, V10, V20, and V30 were significantly higher in patients who experienced cardiac events compared with those who did not. The results of this study showed that BNP measurement, particularly the change ratio of BNP pre- and post-CRT, may be a useful cardiac event predictor in addition to dosimetric parameters.
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Affiliation(s)
- Yoshiomi Hatayama
- Department of Radiation Oncology, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Shiori Kudo
- Hirosaki University School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Riko Ota
- Hirosaki University School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Akane Kuroki
- Hirosaki University School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Mitsuki Tanaka
- Department of Radiation Oncology, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Chihiro Yotsuya
- Department of Internal Medicine, Kodomari Clinic, Kitatsugaru-gun, Aomori 037-0512, Japan
| | - Koji Ichise
- Department of Radiation Oncology, Sumitomo Hospital, Osaka, Osaka 530-0005, Japan
| | - Ichitaro Fujioka
- Department of Radiation Oncology, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Mariko Sato
- Department of Radiation Oncology, Southern Tohoku BNCT Research Center, Koriyama, Fukushima 963-8563, Japan
| | - Hideo Kawaguchi
- Department of Radiation Oncology, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
| | - Masahiko Aoki
- Department of Radiation Oncology, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036-8562, Japan
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Walls GM, Ghita M, Queen R, Edgar KS, Gill EK, Kuburas R, Grieve DJ, Watson CJ, McWilliam A, Van Herk M, Williams KJ, Cole AJ, Jain S, Butterworth KT. Spatial Gene Expression Changes in the Mouse Heart After Base-Targeted Irradiation. Int J Radiat Oncol Biol Phys 2023; 115:453-463. [PMID: 35985456 DOI: 10.1016/j.ijrobp.2022.08.031] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 08/03/2022] [Accepted: 08/05/2022] [Indexed: 01/11/2023]
Abstract
PURPOSE Radiation cardiotoxicity (RC) is a clinically significant adverse effect of treatment for patients with thoracic malignancies. Clinical studies in lung cancer have indicated that heart substructures are not uniformly radiosensitive, and that dose to the heart base drives RC. In this study, we aimed to characterize late changes in gene expression using spatial transcriptomics in a mouse model of base regional radiosensitivity. METHODS AND MATERIALS An aged female C57BL/6 mouse was irradiated with 16 Gy delivered to the cranial third of the heart using a 6 × 9 mm parallel opposed beam geometry on a small animal radiation research platform, and a second mouse was sham-irradiated. After echocardiography, whole hearts were collected at 30 weeks for spatial transcriptomic analysis to map gene expression changes occurring in different regions of the partially irradiated heart. Cardiac regions were manually annotated on the capture slides and the gene expression profiles compared across different regions. RESULTS Ejection fraction was reduced at 30 weeks after a 16 Gy irradiation to the heart base, compared with the sham-irradiated controls. There were markedly more significant gene expression changes within the irradiated regions compared with nonirradiated regions. Variation was observed in the transcriptomic effects of radiation on different cardiac base structures (eg, between the right atrium [n = 86 dysregulated genes], left atrium [n = 96 dysregulated genes], and the vasculature [n = 129 dysregulated genes]). Disrupted biological processes spanned extracellular matrix as well as circulatory, neuronal, and contractility activities. CONCLUSIONS This is the first study to report spatially resolved gene expression changes in irradiated tissues. Examination of the regional radiation response in the heart can help to further our understanding of the cardiac base's radiosensitivity and support the development of actionable targets for pharmacologic intervention and biologically relevant dose constraints.
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Affiliation(s)
- Gerard M Walls
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Northern Ireland; Cancer Centre Belfast City Hospital, Belfast Health & Social Care Trust, Belfast, Northern Ireland.
| | - Mihaela Ghita
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Northern Ireland
| | - Rachel Queen
- Biosciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle-upon-Tyne, England
| | - Kevin S Edgar
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, Belfast, Northern Ireland
| | - Eleanor K Gill
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, Belfast, Northern Ireland; Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, England
| | - Refik Kuburas
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Northern Ireland
| | - David J Grieve
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, Belfast, Northern Ireland
| | - Chris J Watson
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, Belfast, Northern Ireland
| | - Alan McWilliam
- Division of Cancer Sciences, University of Manchester, Oglesby Building, Manchester, England; Department of Radiation Therapy Related Research, The Christie Foundation Trust, Manchester, England
| | - Marcel Van Herk
- Division of Cancer Sciences, University of Manchester, Oglesby Building, Manchester, England; Department of Radiation Therapy Related Research, The Christie Foundation Trust, Manchester, England
| | - Kaye J Williams
- Division of Pharmacy and Optometry, School of Health Science, Faculty of Biology Medicine and Health, University of Manchester, Manchester, England
| | - Aidan J Cole
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Northern Ireland; Cancer Centre Belfast City Hospital, Belfast Health & Social Care Trust, Belfast, Northern Ireland
| | - Suneil Jain
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Northern Ireland; Cancer Centre Belfast City Hospital, Belfast Health & Social Care Trust, Belfast, Northern Ireland
| | - Karl T Butterworth
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Northern Ireland
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Walls GM, O'Kane R, Ghita M, Kuburas R, McGarry CK, Cole AJ, Jain S, Butterworth KT. Murine models of radiation cardiotoxicity: A systematic review and recommendations for future studies. Radiother Oncol 2022; 173:19-31. [PMID: 35533784 DOI: 10.1016/j.radonc.2022.04.030] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 04/13/2022] [Accepted: 04/29/2022] [Indexed: 12/11/2022]
Abstract
BACKGROUND AND PURPOSE The effects of radiation on the heart are dependent on dose, fractionation, overall treatment time, and pre-existing cardiovascular pathology. Murine models have played a central role in improving our understanding of the radiation response of the heart yet a wide range of exposure parameters have been used. We evaluated the study design of published murine cardiac irradiation experiments to assess gaps in the literature and to suggest guidance for the harmonisation of future study reporting. METHODS AND MATERIALS A systematic review of mouse/rat studies published 1981-2021 that examined the effect of radiation on the heart was performed. The protocol was published on PROSPERO (CRD42021238921) and the findings were reported in accordance with the PRISMA guidance. Risk of bias was assessed using the SYRCLE checklist. RESULTS 159 relevant full-text original articles were reviewed. The heart only was the target volume in 67% of the studies and simulation details were unavailable for 44% studies. Dosimetry methods were reported in 31% studies. The pulmonary effects of whole and partial heart irradiation were reported in 13% studies. Seventy-eight unique dose-fractionation schedules were evaluated. Large heterogeneity was observed in the endpoints measured, and the reporting standards were highly variable. CONCLUSIONS Current murine models of radiation cardiotoxicity cover a wide range of irradiation configurations and latency periods. There is a lack of evidence describing clinically relevant dose-fractionations, circulating biomarkers and radioprotectants. Recommendations for the consistent reporting of methods and results of in vivo cardiac irradiation studies are made to increase their suitability for informing the design of clinical studies.
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Affiliation(s)
- Gerard M Walls
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Lisburn Road, Belfast, Northern Ireland; Cancer Centre Belfast City Hospital, Belfast Health & Social Care Trust, Lisburn Road, Belfast, Northern Ireland.
| | - Reagan O'Kane
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Lisburn Road, Belfast, Northern Ireland
| | - Mihaela Ghita
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Lisburn Road, Belfast, Northern Ireland
| | - Refik Kuburas
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Lisburn Road, Belfast, Northern Ireland
| | - Conor K McGarry
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Lisburn Road, Belfast, Northern Ireland; Cancer Centre Belfast City Hospital, Belfast Health & Social Care Trust, Lisburn Road, Belfast, Northern Ireland
| | - Aidan J Cole
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Lisburn Road, Belfast, Northern Ireland; Cancer Centre Belfast City Hospital, Belfast Health & Social Care Trust, Lisburn Road, Belfast, Northern Ireland
| | - Suneil Jain
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Lisburn Road, Belfast, Northern Ireland; Cancer Centre Belfast City Hospital, Belfast Health & Social Care Trust, Lisburn Road, Belfast, Northern Ireland
| | - Karl T Butterworth
- Patrick G Johnston Centre for Cancer Research, Queen's University Belfast, Lisburn Road, Belfast, Northern Ireland
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Fang Z, Chen P, Tang S, Chen A, Zhang C, Peng G, Li M, Chen X. Will mesenchymal stem cells be future directions for treating radiation-induced skin injury? Stem Cell Res Ther 2021; 12:179. [PMID: 33712078 PMCID: PMC7952822 DOI: 10.1186/s13287-021-02261-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Accepted: 03/01/2021] [Indexed: 01/09/2023] Open
Abstract
Radiation-induced skin injury (RISI) is one of the common serious side effects of radiotherapy (RT) for patients with malignant tumors. Mesenchymal stem cells (MSCs) are applied to RISI repair in some clinical cases series except some traditional options. Though direct replacement of damaged cells may be achieved through differentiation capacity of MSCs, more recent data indicate that various cytokines and chemokines secreted by MSCs are involved in synergetic therapy of RISI by anti-inflammatory, immunomodulation, antioxidant, revascularization, and anti-apoptotic activity. In this paper, we not only discussed different sources of MSCs on the treatment of RISI both in preclinical studies and clinical trials, but also summarized the applications and mechanisms of MSCs in other related regenerative fields.
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Affiliation(s)
- Zhuoqun Fang
- Department of Plastic Surgery, Fujian Medical University Union Hospital, 29 Xinquan Road, Fuzhou, 350001, Fujian, People's Republic of China
| | - Penghong Chen
- Department of Plastic Surgery, Fujian Medical University Union Hospital, 29 Xinquan Road, Fuzhou, 350001, Fujian, People's Republic of China
| | - Shijie Tang
- Department of Plastic Surgery, Fujian Medical University Union Hospital, 29 Xinquan Road, Fuzhou, 350001, Fujian, People's Republic of China
| | - Aizhen Chen
- Department of Plastic Surgery, Fujian Medical University Union Hospital, 29 Xinquan Road, Fuzhou, 350001, Fujian, People's Republic of China
| | - Chaoyu Zhang
- Department of Plastic Surgery, Fujian Medical University Union Hospital, 29 Xinquan Road, Fuzhou, 350001, Fujian, People's Republic of China
| | - Guohao Peng
- Department of Plastic Surgery, Fujian Medical University Union Hospital, 29 Xinquan Road, Fuzhou, 350001, Fujian, People's Republic of China
| | - Ming Li
- Department of Plastic Surgery, Fujian Medical University Union Hospital, 29 Xinquan Road, Fuzhou, 350001, Fujian, People's Republic of China
| | - Xiaosong Chen
- Department of Plastic Surgery, Fujian Medical University Union Hospital, 29 Xinquan Road, Fuzhou, 350001, Fujian, People's Republic of China.
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Tapio S. Pathology and biology of radiation-induced cardiac disease. JOURNAL OF RADIATION RESEARCH 2016; 57:439-448. [PMID: 27422929 PMCID: PMC5045085 DOI: 10.1093/jrr/rrw064] [Citation(s) in RCA: 112] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 05/09/2016] [Indexed: 05/08/2023]
Abstract
Heart disease is the leading global cause of death. The risk for this disease is significantly increased in populations exposed to ionizing radiation, but the mechanisms are not fully elucidated yet. This review aims to gather and discuss the latest data about pathological and biological consequences in the radiation-exposed heart in a comprehensive manner. A better understanding of the molecular and cellular mechanisms underlying radiation-induced damage in heart tissue and cardiac vasculature will provide novel targets for therapeutic interventions. These may be valuable for individuals clinically or occupationally exposed to varying doses of ionizing radiation.
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Affiliation(s)
- Soile Tapio
- Helmholtz Zentrum München, German Research Center for Environmental Health GmbH, Institute of Radiation Biology, Ingolstaedter Landstrasse 1, 85764 Neuherberg, Germany
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Effects of γ-irradiation on Na,K-ATPase in cardiac sarcolemma. Mol Cell Biochem 2013; 388:241-7. [DOI: 10.1007/s11010-013-1915-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2013] [Accepted: 12/06/2013] [Indexed: 10/25/2022]
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Jingu K, Nemoto K, Kaneta T, Oikawa M, Ogawa Y, Ariga H, Takeda K, Sakayauchi T, Fujimoto K, Narazaki K, Takai Y, Nakata E, Fukuda H, Takahashi S, Yamada S. Temporal change in brain natriuretic Peptide after radiotherapy for thoracic esophageal cancer. Int J Radiat Oncol Biol Phys 2007; 69:1417-23. [PMID: 17869015 DOI: 10.1016/j.ijrobp.2007.05.054] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2006] [Revised: 05/09/2007] [Accepted: 05/11/2007] [Indexed: 10/22/2022]
Abstract
PURPOSE To investigate the relationships of plasma levels of brain natriuretic peptide (BNP) with abnormal (18)F-fluorodeoxyglucose (FDG) accumulation in the myocardium corresponding to irradiated fields and temporal changes in BNP, which is used as an index of heart remodeling, after radiotherapy for the mediastinum. MATERIALS AND METHODS Brain natriuretic peptide concentrations were measured before and after radiotherapy for thoracic esophageal cancer, and the change in BNP concentration after radiotherapy was investigated. Moreover, FDG accumulation in the myocardium was investigated in patients who had undergone FDG positron emission tomography less than 14 days before or after measurement of BNP concentration, and the Mann-Whitney U test was used to detect significant difference between BNP concentrations in patients with and without abnormal FDG accumulation corresponding to the irradiated field. RESULTS There was significant difference between the levels of BNP in patients without abnormal FDG accumulation in the irradiated myocardium and in patients with abnormal FDG accumulation (p < 0.001). The levels of BNP in the 9-24 months after radiotherapy group and in the >24 months after radiotherapy group were significantly higher than the levels in the before radiotherapy group, immediately after radiotherapy group, 1-2 months after radiotherapy group, and control group. CONCLUSIONS The level of BNP was significantly increased more than 9 months after the start of radiotherapy and was significantly higher in patients who had high FDG accumulation corresponding to the irradiated field. The results of this study indicate that BNP concentration might be an early indicator of radiation-induced myocardial damage.
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Affiliation(s)
- Keiichi Jingu
- Department of Therapeutic Radiology, Tohoku University School of Medicine, Sendai, Japan.
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Pandya K, Kim HS, Smithies O. Fibrosis, not cell size, delineates beta-myosin heavy chain reexpression during cardiac hypertrophy and normal aging in vivo. Proc Natl Acad Sci U S A 2006; 103:16864-9. [PMID: 17068123 PMCID: PMC1624863 DOI: 10.1073/pnas.0607700103] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Reexpression of the fetally expressed beta-myosin heavy chain (beta-MHC) gene is a well documented marker of pathological cardiac hypertrophy and normal aging in many experimental models. To gain insights into factors affecting this reexpression of beta-MHC within the complex anatomical structure of the heart, we investigated the spatial pattern of its expression at the level of single cells during aging and hypertrophy. We generated mice that express yellow fluorescent protein fused to the N terminus of the beta-MHC and examined its expression pattern during normal aging and in mice with hypertrophy induced by constitutive expression of a renin transgene. The localization of fibrosis within the hearts also was determined by using a fluorescent lectin. The results show that reexpression of beta-MHC occurs in discrete subsets of myocytes within the subendocardium rather than uniformly throughout the heart, that beta-MHC induction is not an obligatory consequence of cellular hypertrophy, and that beta-MHC-expressing cells in the normal aging heart and the hypertrophic heart are distributed predominantly in clusters within and surrounding foci of fibrosis. We conclude that beta-MHC gene expression in the normal aging adult and hypertrophic mouse heart is a marker of fibrosis rather than of cellular hypertrophy.
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Affiliation(s)
- Kumar Pandya
- Department of Pathology and Laboratory Medicine, University of North Carolina, Chapel Hill, NC 27599
| | - Hyung-Suk Kim
- Department of Pathology and Laboratory Medicine, University of North Carolina, Chapel Hill, NC 27599
| | - Oliver Smithies
- Department of Pathology and Laboratory Medicine, University of North Carolina, Chapel Hill, NC 27599
- *To whom correspondence should be addressed at:
Department of Pathology and Laboratory Medicine, University of North Carolina, 701 Brinkhous Bullit Building, Chapel Hill, NC 27599-7525. E-mail:
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Magga J, Puhakka M, Hietakorpi S, Punnonen K, Uusimaa P, Risteli J, Vuolteenaho O, Ruskoaho H, Peuhkurinen K. Atrial natriuretic peptide, B-type natriuretic peptide, and serum collagen markers after acute myocardial infarction. J Appl Physiol (1985) 2004; 96:1306-11. [PMID: 14607848 DOI: 10.1152/japplphysiol.00557.2003] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Experimental data suggest that atrial natriuretic peptide (ANP) and B-type natriuretic peptide (BNP) act locally as antifibrotic factors in heart. We investigated the interrelationships of natriuretic peptides and collagen markers in 93 patients receiving thrombolytic treatment for their first acute myocardial infarction (AMI). Collagen formation following AMI, evaluated as serum levels of amino terminal propeptide of type III procollagen, correlated with NH2-terminal proANP ( r = 0.45, P < 0.001), BNP ( r = 0.55, P < 0.001) and NH2-terminal proBNP ( r = 0.50, P < 0.01) on day 4 after thrombolysis. Levels of intact amino terminal propeptide of type I procollagen decreased by 34% ( P < 0.001), and levels of carboxy terminal cross-linked telopeptide of type I collagen (ICTP) increased by 65% ( P < 0.001). ICTP levels correlated with NH2-terminal proBNP ( r = 0.25, P < 0.05) and BNP ( r = 0.28, P < 0.05) on day 4. Our results suggest that ANP and BNP may act as regulators of collagen scar formation and left ventricular remodeling after AMI in humans. Furthermore, degradation of type I collagen is increased after AMI and may be regulated by BNP.
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Affiliation(s)
- Jarkko Magga
- Department of Internal Medicine, Kuopio University Hospital, 70211 Kuopio, Finland
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