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Barreto TLN, Kotchetkoff ECDA, Lago CSA, Sarni ROS. Agreement of cardiovascular risk in ataxia-telangiectasia mutated heterozygotes and their children with Ataxia-telangiectasia. Expert Opin Orphan Drugs 2020. [DOI: 10.1080/21678707.2020.1780117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Petukhov D, Richter-Dayan M, Fridlender Z, Breuer R, Wallach-Dayan SB. Increased Regeneration Following Stress-Induced Lung Injury in Bleomycin-Treated Chimeric Mice with CD44 Knockout Mesenchymal Cells. Cells 2019; 8:E1211. [PMID: 31591327 PMCID: PMC6829612 DOI: 10.3390/cells8101211] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Revised: 10/02/2019] [Accepted: 10/03/2019] [Indexed: 01/24/2023] Open
Abstract
CD44, an adhesion-molecule promoting cell-migration, is shown here to increase in stress conditions following bleomycin-induced apoptosis in alveolar epithelial cells (AECs), a main target of lung injury. In vivo, it inhibits tissue regeneration and leads to fibrosis. We show that some AECs survive by the ataxia-telangiectasia mutated kinase/ATM pathway, and undergo a CD44-mediated epithelial-mesenchymal transdifferentiation (EMT) with migratory capacities in vitro, and in vivo. We assessed apoptosis vs. proliferation of AECs following bleomycin, ATM/P53 signaling pathway in AECs, and CD44 involvement in EMT, cell motility and tissue regeneration in vitro and in vivo. Expression of survival genes, CD44, and ATM/p53 pathway was elevated in AECs surviving bleomycin injury, as were the markers of EMT (downregulation of E-cadherin, upregulation of N-cadherin and vimentin, nuclear translocation of β-catenin). Inhibition of CD44 decreased AECs transdifferentiation. Bleomycin-treated chimeric CD44KO-mice had decreased EMT markers, ATM, and mesenchymal cells (α-SMA+) accumulation in lung, increased surfactant-b, diminished lung mesenchymal cell motility, and increased lung tissue regenerative capacity following bleomycin injury, as indicated by lung collagen content and semiquantitave morphological index scoring. Thus, AECs surviving lung injury are plastic and undergo ATM-mediated, CD44-dependent transdifferentiation, preventing tissue regeneration and promoting fibrosis. Synthetic or natural compounds that downregulate CD44 may improve tissue regeneration following injury.
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Affiliation(s)
- Dmytro Petukhov
- Lung Cellular and Molecular Biology Laboratory, Institute of Pulmonary Medicine, Hadassah-Hebrew University Medical Center, PO Box 12000, Qiryat Hadassah, Jerusalem 91120, Israel.
| | - Mark Richter-Dayan
- Department of Emergency Medicine, Hadassah-Hebrew University Medical Center, PO Box 12000, Qiryat Hadassah, Jerusalem 91120, Israel.
| | - Zvi Fridlender
- Lung Cellular and Molecular Biology Laboratory, Institute of Pulmonary Medicine, Hadassah-Hebrew University Medical Center, PO Box 12000, Qiryat Hadassah, Jerusalem 91120, Israel.
| | - Raphael Breuer
- Lung Cellular and Molecular Biology Laboratory, Institute of Pulmonary Medicine, Hadassah-Hebrew University Medical Center, PO Box 12000, Qiryat Hadassah, Jerusalem 91120, Israel.
- Department of Pathology, Boston University School of Medicine, 72 East Concord St., Boston, MA 02118, USA.
| | - Shulamit B Wallach-Dayan
- Lung Cellular and Molecular Biology Laboratory, Institute of Pulmonary Medicine, Hadassah-Hebrew University Medical Center, PO Box 12000, Qiryat Hadassah, Jerusalem 91120, Israel.
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Blignaut M, Loos B, Botchway SW, Parker AW, Huisamen B. Ataxia-Telangiectasia Mutated is located in cardiac mitochondria and impacts oxidative phosphorylation. Sci Rep 2019; 9:4782. [PMID: 30886180 PMCID: PMC6423017 DOI: 10.1038/s41598-019-41108-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Accepted: 02/26/2019] [Indexed: 01/16/2023] Open
Abstract
The absence of Ataxia-Telangiectasia mutated protein kinase (ATM) is associated with neurological, metabolic and cardiovascular defects. The protein has been associated with mitochondria and its absence results in mitochondrial dysfunction. Furthermore, it can be activated in the cytosol by mitochondrial oxidative stress and mediates a cellular anti-oxidant response through the pentose phosphate pathway (PPP). However, the precise location and function of ATM within mitochondria and its role in oxidative phosphorylation is still unknown. We show that ATM is found endogenously within cardiac myocyte mitochondria under normoxic conditions and is consistently associated with the inner mitochondrial membrane. Acute ex vivo inhibition of ATM protein kinase significantly decreased mitochondrial electron transfer chain complex I-mediated oxidative phosphorylation rate but did not decrease coupling efficiency or oxygen consumption rate during β-oxidation. Chemical inhibition of ATM in rat cardiomyoblast cells (H9c2) significantly decreased the excited-state autofluorescence lifetime of enzyme-bound reduced NADH and its phosphorylated form, NADPH (NAD(P)H; 2.77 ± 0.26 ns compared to 2.57 ± 0.14 ns in KU60019-treated cells). This suggests an interaction between ATM and the electron transfer chain in the mitochondria, and hence may have an important role in oxidative phosphorylation in terminally differentiated cells such as cardiomyocytes.
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Affiliation(s)
- Marguerite Blignaut
- Division of Medical Physiology, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, 7505, South Africa.
| | - Ben Loos
- Department of Physiological Sciences, Faculty of Sciences, Stellenbosch University, Stellenbosch, 7602, South Africa
| | - Stanley W Botchway
- Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, OX11 0QX, UK
- Oxford Brookes University, Department of Biological and Medical Sciences, Oxford, OX3 0BP, UK
| | - Anthony W Parker
- Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, OX11 0QX, UK
- Department of Physics, Faculty of Science, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa
| | - Barbara Huisamen
- Division of Medical Physiology, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, 7505, South Africa
- Biomedical, Research and Innovation Platform, South African Medical Research Council, Tygerberg, 7505, South Africa
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Thrasher PR, Scofield SLC, Dalal S, Crawford CC, Singh M, Singh K. Ataxia telangiectasia mutated kinase deficiency impairs the autophagic response early during myocardial infarction. Am J Physiol Heart Circ Physiol 2018; 315:H48-H57. [PMID: 29652546 PMCID: PMC6087781 DOI: 10.1152/ajpheart.00042.2018] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Revised: 03/29/2018] [Accepted: 04/09/2018] [Indexed: 12/19/2022]
Abstract
Ataxia telangiectasia mutated kinase (ATM) is activated in response to DNA damage. We have previously shown that ATM plays a critical role in myocyte apoptosis and cardiac remodeling after myocardial infarction (MI). Here, we tested the hypothesis that ATM deficiency results in autophagic impairment in the heart early during MI. MI was induced in wild-type (WT) and ATM heterozygous knockout (hKO) mice by ligation of the left anterior descending artery. Structural and biochemical parameters of the heart were measured 4 h after left anterior descending artery ligation. M-mode echocardiography revealed that MI worsens heart function, as evidenced by reduced percent ejection fraction and fractional shortening in both groups. However, MI-induced increase in left ventricular end-diastolic and end-systolic diameters and volumes were significantly lower in hKO hearts. ATM deficiency resulted in autophagic impairment during MI, as evidenced by decreased microtubule-associated protein light chain 3-II increased p62, decreased cathepsin D protein levels, and increased aggresome accumulation. ERK1/2 activation was only observed in WT-MI hearts. Activation of Akt and AMP-activated protein kinase (AMPK) was lower, whereas activation of glycogen synthase kinase (GSK)-3β and mammalian target of rapamycin (mTOR) was higher in hKO-MI hearts. Inhibition of ATM using KU-55933 resulted in autophagic impairment in cardiac fibroblasts, as evidenced by decreased light chain 3-II protein levels and formation of acidic vesicular organelles. This impairment was associated with decreased activation of Akt and AMPK but enhanced activation of GSK-3β and mTOR in KU-55933-treated fibroblasts. Thus, ATM deficiency results in autophagic impairment in the heart during MI and cardiac fibroblasts. This autophagic impairment may occur via the activation of GSK-3β and mTOR and inactivation of Akt and AMPK. NEW & NOTEWORTHY Ataxia telangiectasia mutated kinase (ATM) plays a critical role in myocyte apoptosis and cardiac remodeling after myocardial infarction (MI). Here, we provide evidence that ATM deficiency results in autophagic impairment during MI. Further investigation of the role of ATM in autophagy post-MI may provide novel therapeutic targets for patients with ataxia telangiectasia suffering from heart disease.
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Affiliation(s)
- Patsy R Thrasher
- Department of Biomedical Sciences, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee
| | - Stephanie L C Scofield
- Department of Biomedical Sciences, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee
| | - Suman Dalal
- Department of Biomedical Sciences, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee
| | - Claire C Crawford
- Department of Biomedical Sciences, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee
| | - Mahipal Singh
- Department of Biomedical Sciences, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee
| | - Krishna Singh
- Department of Biomedical Sciences, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, Tennessee
- Center for Inflammation, Infectious Disease, and Immunity, East Tennessee State University, Johnson City, Tennessee
- James H. Quillen Veterans Affairs Medical Center, Mountain Home, Tennessee
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Kotchetkoff ECDA, Souza FISD, Fonseca FLA, Hix S, Ajzen SA, Shigueoka DC, Carvalho BTC, Sarni ROS. Assessing cardiovascular risk in ATM heterozygotes. Rev Assoc Med Bras (1992) 2018; 64:148-153. [DOI: 10.1590/1806-9282.64.02.148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Accepted: 08/06/2017] [Indexed: 11/21/2022] Open
Abstract
Summary Objective: To evaluate the carotid intima-media complex (CIMC) thickness and lipid metabolism biomarkers associated with cardiovascular risk (CR) in parents of patients with ataxia-telangiectasia and verify an association with gender. Method: A cross-sectional and controlled study with 29 ATM heterozygotes and 14 healthy controls. Biochemical tests and CIMC thickness measurement were performed. Results: The mean CIMC measurement in heterozygous ATM was 0.72 ± 0.1 mm (minimum: 0.5 mm and maximum: 1.0 mm). Noticed high percentage of amounts above 75 percentile compared to the population referential (16 [76.2%]), without any significant statistical differences between the female and the male gender (11/15 [73.3%] vs. 5/6 [83.3%]; p=0.550). The comparison between heterozygous and controls, stratified by gender, showed that in heterozygous ATMs, women had higher concentrations of HDL-c compared to men, as well as higher values of hs-CRP in relation to the control women. In heterozygous ATMs, stratified by gender, the correlation between HDL-c and hs-CRP was inversely proportional and stronger among women, with a tendency to statistical significance. Conclusion: Heterozygous ATMs did not differ from controls in relation to the biomarkers studied related to CR. However, most of them presented increased CIMC, independent predictor of death, risk for myocardial infarction and stroke, compared to the referential for the same age group. This finding suggests CR in the heterozygous ATM and shows to the need to monitor CIMC thickness and nutritional orientations.
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Affiliation(s)
| | | | | | - Sonia Hix
- Faculdade de Medicina do ABC, Brazil
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Ding X, He Y, Hao Q, Chen S, Yang M, Leng SX, Yue J, Dong B. The association of single nucleotide polymorphism rs189037C>T in ATM gene with coronary artery disease in Chinese Han populations: A case control study. Medicine (Baltimore) 2018; 97:e9747. [PMID: 29369221 PMCID: PMC5794405 DOI: 10.1097/md.0000000000009747] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Accumulated evidence has indicated that ataxia telangiectasia mutated (ATM) is closely related to atherosclerosis and cardiovascular diseases. So we aimed to examine potential association between a gene variant [single nucleotide polymorphisms (SNPs), i.e., rs189037C>T] in the promoter of ATM gene and coronary artery disease (CAD) in Chinese Han populations.In this hospital-based case-control study, a total of 1308 participants were divided into CAD group (652 patients) and control group (656 subjects) after performing coronary angiography. The SNP rs189037 was genotyped by using polymerase chain reaction-restriction fragment length polymorphism.The distribution of rs189037 genotypes and alleles showed a significant difference between CAD and control subjects (genotypes: P = .032; alleles: P = .028). The percentage of the TT genotype is much higher in control group than that in CAD group (22.0% vs 16.3%, P = .009). After adjustment of the major confounding factors, such difference remained significant (OR = 0.62, 95% CI = 0.43-0.89, P = .010). After analyzing data from different groups divided by genders and smoking status respectively, we found that the protective effect of TT genotype on CAD was significant in males (P = .007) and smokers (P = .031). The difference remained statistically significant after multivariate adjustment (adjusted in males: OR = 0.60, 95% CI = 0.38-0.93, P = .022; adjusted in smokers: OR = 0.47, 95% CI = 0.27-0.81, P = .006).Our study suggests that ATM rs189037 polymorphism is associated with CAD in Chinese Han populations. The TT genotype of rs189037 seems to be associated with a lower risk of CAD and a protective genetic marker of CAD, especially in males and smokers.
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Affiliation(s)
- Xiang Ding
- The Center of Gerontology and Geriatrics
- National Clinical Research Center of Geriatrics
| | - Yong He
- Department of Cardiology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, China
| | - Qiukui Hao
- The Center of Gerontology and Geriatrics
| | | | - Ming Yang
- The Center of Gerontology and Geriatrics
| | - Sean X. Leng
- Division of Geriatric Medicine and Gerontology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Jirong Yue
- The Center of Gerontology and Geriatrics
| | - Birong Dong
- The Center of Gerontology and Geriatrics
- Collaborative Innovation Center of Sichuan for Elderly Care and Health, Chengdu, Sichuan Province, China
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Ding X, Hao Q, Yang M, Chen T, Chen S, Yue J, Leng SX, Dong B. Polymorphism rs189037C > T in the promoter region of the ATM gene may associate with reduced risk of T2DM in older adults in China: a case control study. BMC MEDICAL GENETICS 2017; 18:84. [PMID: 28806901 PMCID: PMC5557265 DOI: 10.1186/s12881-017-0446-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 07/31/2017] [Indexed: 02/05/2023]
Abstract
Background Recent evidence indicates that ataxia telangiectasia mutated (ATM) is a cytoplasmic protein that involves in insulin signaling pathways. When ATM gene is mutated, this event appears to contribute to the development of insulin resistance and type 2 diabetes mellitus (T2DM). Up to date, little information about the relationship between ATM gene polymorphism and T2DM is available. This study aimed to explore potential association between a genetic variant [single nucleotide polymorphism (SNP), i.e. rs189037C > T] in the ATM promoter region and T2DM in older adults in China. Methods We conducted a 1:1 age- and sex-matched case-control study. It enrolled 160 patients including 80 type 2 diabetic and 80 nondiabetic patients who were aged 60 years and above. Genotyping of the polymorphism rs189037 in the promoter of the ATM gene was performed using polymerase chain reaction-restriction fragment length polymorphism. Chi-square test or Fisher’s exact test (when an expected cell count was <5) and unpaired Student’s t test were used for categorical and continuous variables, respectively. Logistic regression was used to estimate odds ratio (OR) and 95% confidence interval (CI) with adjustment for factors associated with T2DM. Results Significant association was found between the genotypes of the ATM rs189037 polymorphism and T2DM (P = 0.037). The frequency of CT genotype is much higher in patients without T2DM than in diabetics (60.0% versus 40.0%, P = 0.012). After adjustment of the major confounding factors, such difference remained significant (OR for non-T2DM is 2.62, 95%CI = 1.05–6.53, P = 0.038). Similar effect of CT genotype on T2DM was observed in male population (adjusted: OR = 0.27, 95%CI = 0.09–0.84, P = 0.024). In addition, the percentage of TT genotype in diabetics with coronary artery disease (CAD) was considerably lower than in those without CAD (17.9% versus 61.5%, P = 0.004). Conclusions Our study suggests that the ATM rs189037 polymorphism is associated with reduced risk of T2DM in older adult population in China. Specifically, CT heterozygote seems to be associated with a lower risk of T2DM than CC or TT genotype, especially in male older adults. Moreover, TT genotype may reduce the risk of CAD in diabetic patients. Electronic supplementary material The online version of this article (doi:10.1186/s12881-017-0446-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Xiang Ding
- Center of Gerontology and Geriatrics, West China Hospital, Sichuan University, NO. 37, Guoxuexiang, Chengdu, Sichuan, 610041, China
| | - Qiukui Hao
- Center of Gerontology and Geriatrics, West China Hospital, Sichuan University, NO. 37, Guoxuexiang, Chengdu, Sichuan, 610041, China
| | - Ming Yang
- Center of Gerontology and Geriatrics, West China Hospital, Sichuan University, NO. 37, Guoxuexiang, Chengdu, Sichuan, 610041, China
| | - Tie Chen
- Institute of Molecular Medicine, Health Science Center, Shenzhen University, Shenzhen, 518060, China
| | - Shanping Chen
- Center of Gerontology and Geriatrics, West China Hospital, Sichuan University, NO. 37, Guoxuexiang, Chengdu, Sichuan, 610041, China
| | - Jirong Yue
- Center of Gerontology and Geriatrics, West China Hospital, Sichuan University, NO. 37, Guoxuexiang, Chengdu, Sichuan, 610041, China.
| | - Sean X Leng
- Division of Geriatric Medicine and Gerontology, Department of Medicine, Johns Hopkins University School of Medicine, 5501 Hopkins Bayview Circle, Baltimore, MD, 21224, USA
| | - Birong Dong
- Center of Gerontology and Geriatrics, West China Hospital, Sichuan University, NO. 37, Guoxuexiang, Chengdu, Sichuan, 610041, China.
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Shiloh Y, Lederman HM. Ataxia-telangiectasia (A-T): An emerging dimension of premature ageing. Ageing Res Rev 2017; 33:76-88. [PMID: 27181190 DOI: 10.1016/j.arr.2016.05.002] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 05/02/2016] [Accepted: 05/10/2016] [Indexed: 12/28/2022]
Abstract
A-T is a prototype genome instability syndrome and a multifaceted disease. A-T leads to neurodegeneration - primarily cerebellar atrophy, immunodeficiency, oculocutaneous telangiectasia (dilated blood vessels), vestigial thymus and gonads, endocrine abnormalities, cancer predisposition and varying sensitivity to DNA damaging agents, particularly those that induce DNA double-strand breaks. With the recent increase in life expectancy of A-T patients, the premature ageing component of this disease is gaining greater awareness. The complex A-T phenotype reflects the ever growing number of functions assigned to the protein encoded by the responsible gene - the homeostatic protein kinase, ATM. The quest to thoroughly understand the complex A-T phenotype may reveal yet elusive ATM functions.
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Daniel LL, Daniels CR, Harirforoosh S, Foster CR, Singh M, Singh K. Deficiency of ataxia telangiectasia mutated kinase delays inflammatory response in the heart following myocardial infarction. J Am Heart Assoc 2015; 3:e001286. [PMID: 25520329 PMCID: PMC4338722 DOI: 10.1161/jaha.114.001286] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background Ataxia‐telangiectasia results from mutations in ataxia telangiectasia mutated kinase (ATM) gene. We recently reported that ATM deficiency attenuates left ventricular (LV) dysfunction and dilatation 7 days after myocardial infarction (MI) with increased apoptosis and fibrosis. Here we investigated the role of ATM in the induction of inflammatory response, and activation of survival signaling molecules in the heart acute post‐MI. Methods and Results LV structure, function, inflammatory response, and biochemical parameters were measured in wild‐type (WT) and ATM heterozygous knockout (hKO) mice 1 and 3 days post‐MI. ATM deficiency had no effect on infarct size. MI‐induced decline in heart function, as measured by changes in percent fractional shortening, ejection fraction and LV end systolic and diastolic volumes, was lower in hKO‐MI versus WT‐MI (n=10 to 12). The number of neutrophils and macrophages was significantly lower in the infarct LV region of hKO versus WT 1 day post‐MI. Fibrosis and expression of α‐smooth muscle actin (myofibroblast marker) were higher in hKO‐MI, while active TGF‐β1 levels were higher in the WT‐MI 3 days post‐MI. Myocyte cross‐sectional area was higher in hKO‐sham with no difference between the two MI groups. MMP‐9 protein levels were similarly increased in the infarct LV region of both MI groups. Apoptosis was significantly higher in the infarct LV region of hKO at both time points. Akt activation was lower, while Bax expression was higher in hKO‐MI infarct. Conclusion ATM deficiency results in decreased dilative remodeling and delays inflammatory response acute post‐MI. However, it associates with increased fibrosis and apoptosis.
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Affiliation(s)
- Laura L Daniel
- Department of Biomedical Sciences, James H Quillen College of Medicine, East Tennessee State University, Johnson City, TN 37614
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Espach Y, Lochner A, Strijdom H, Huisamen B. ATM Protein Kinase Signaling, Type 2 Diabetes and Cardiovascular Disease. Cardiovasc Drugs Ther 2015; 29:51-8. [DOI: 10.1007/s10557-015-6571-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Foster CR, Daniel LL, Daniels CR, Dalal S, Singh M, Singh K. Deficiency of ataxia telangiectasia mutated kinase modulates cardiac remodeling following myocardial infarction: involvement in fibrosis and apoptosis. PLoS One 2013; 8:e83513. [PMID: 24358288 PMCID: PMC3865210 DOI: 10.1371/journal.pone.0083513] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Accepted: 11/05/2013] [Indexed: 12/19/2022] Open
Abstract
Ataxia telangiectasia mutated kinase (ATM) is a cell cycle checkpoint protein activated in response to DNA damage. We recently reported that ATM plays a protective role in myocardial remodeling following β-adrenergic receptor stimulation. Here we investigated the role of ATM in cardiac remodeling using myocardial infarction (MI) as a model. Methods and Results: Left ventricular (LV) structure, function, apoptosis, fibrosis, and protein levels of apoptosis- and fibrosis-related proteins were examined in wild-type (WT) and ATM heterozygous knockout (hKO) mice 7 days post-MI. Infarct sizes were similar in both MI groups. However, infarct thickness was higher in hKO-MI group. Two dimensional M-mode echocardiography revealed decreased percent fractional shortening (%FS) and ejection fraction (EF) in both MI groups when compared to their respective sham groups. However, the decrease in %FS and EF was significantly greater in WT-MI vs hKO-MI. LV end systolic and diastolic diameters were greater in WT-MI vs hKO-MI. Fibrosis, apoptosis, and α-smooth muscle actin staining was significantly higher in hKO-MI vs WT-MI. MMP-2 protein levels and activity were increased to a similar extent in the infarct regions of both groups. MMP-9 protein levels were increased in the non-infarct region of WT-MI vs WT-sham. MMP-9 protein levels and activity were significantly lower in the infarct region of WT vs hKO. TIMP-2 protein levels similarly increased in both MI groups, whereas TIMP-4 protein levels were significantly lower in the infarct region of hKO group. Phosphorylation of p53 protein was higher, while protein levels of manganese superoxide dismutase were significantly lower in the infarct region of hKO vs WT. In vitro, inhibition of ATM using KU-55933 increased oxidative stress and apoptosis in cardiac myocytes.
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Affiliation(s)
- Cerrone R. Foster
- Department of Biomedical Sciences, James H Quillen College of Medicine, James H Quillen Veterans Affairs Medical Center, East Tennessee State University, Johnson City, Tennessee, United States of America
| | - Laura L. Daniel
- Department of Biomedical Sciences, James H Quillen College of Medicine, James H Quillen Veterans Affairs Medical Center, East Tennessee State University, Johnson City, Tennessee, United States of America
| | - Christopher R. Daniels
- Department of Biomedical Sciences, James H Quillen College of Medicine, James H Quillen Veterans Affairs Medical Center, East Tennessee State University, Johnson City, Tennessee, United States of America
| | - Suman Dalal
- Department of Biomedical Sciences, James H Quillen College of Medicine, James H Quillen Veterans Affairs Medical Center, East Tennessee State University, Johnson City, Tennessee, United States of America
| | - Mahipal Singh
- Department of Biomedical Sciences, James H Quillen College of Medicine, James H Quillen Veterans Affairs Medical Center, East Tennessee State University, Johnson City, Tennessee, United States of America
| | - Krishna Singh
- Department of Biomedical Sciences, James H Quillen College of Medicine, James H Quillen Veterans Affairs Medical Center, East Tennessee State University, Johnson City, Tennessee, United States of America
- * E-mail:
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Stretch-Induced Upregulation of Connective Tissue Growth Factor in Rabbit Cardiomyocytes. J Cardiovasc Transl Res 2013; 6:861-9. [DOI: 10.1007/s12265-013-9489-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Accepted: 06/14/2013] [Indexed: 11/27/2022]
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Gorr MW, Stevens SCW, Wold LE. Ataxia telangiectasia mutated kinase in the heart: currency for myocyte apoptosis. Exp Physiol 2012; 97:476. [PMID: 22525664 DOI: 10.1113/expphysiol.2011.063875] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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