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Remex NS, Abdullah CS, Aishwarya R, Kolluru GK, Traylor J, Bhuiyan MAN, Kevil CG, Orr AW, Rom O, Pattillo CB, Bhuiyan MS. Deletion of Sigmar1 leads to increased arterial stiffness and altered mitochondrial respiration resulting in vascular dysfunction. Front Physiol 2024; 15:1386296. [PMID: 38742156 PMCID: PMC11089145 DOI: 10.3389/fphys.2024.1386296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Accepted: 04/15/2024] [Indexed: 05/16/2024] Open
Abstract
Sigmar1 is a ubiquitously expressed, multifunctional protein known for its cardioprotective roles in cardiovascular diseases. While accumulating evidence indicate a critical role of Sigmar1 in cardiac biology, its physiological function in the vasculature remains unknown. In this study, we characterized the expression of Sigmar1 in the vascular wall and assessed its physiological function in the vascular system using global Sigmar1 knockout (Sigmar1-/-) mice. We determined the expression of Sigmar1 in the vascular tissue using immunostaining and biochemical experiments in both human and mouse blood vessels. Deletion of Sigmar1 globally in mice (Sigmar1-/-) led to blood vessel wall reorganizations characterized by nuclei disarray of vascular smooth muscle cells, altered organizations of elastic lamina, and higher collagen fibers deposition in and around the arteries compared to wildtype littermate controls (Wt). Vascular function was assessed in mice using non-invasive time-transit method of aortic stiffness measurement and flow-mediated dilation (FMD) of the left femoral artery. Sigmar1-/- mice showed a notable increase in arterial stiffness in the abdominal aorta and failed to increase the vessel diameter in response to reactive-hyperemia compared to Wt. This was consistent with reduced plasma and tissue nitric-oxide bioavailability (NOx) and decreased phosphorylation of endothelial nitric oxide synthase (eNOS) in the aorta of Sigmar1-/- mice. Ultrastructural analysis by transmission electron microscopy (TEM) of aorta sections showed accumulation of elongated shaped mitochondria in both vascular smooth muscle and endothelial cells of Sigmar1-/- mice. In accordance, decreased mitochondrial respirometry parameters were found in ex-vivo aortic rings from Sigmar1 deficient mice compared to Wt controls. These data indicate a potential role of Sigmar1 in maintaining vascular homeostasis.
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Affiliation(s)
- Naznin Sultana Remex
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
| | - Chowdhury S. Abdullah
- Department of Pathology and Translational Pathobiology, Louisiana State University Health, Shreveport, LA, United States
| | - Richa Aishwarya
- Department of Pathology and Translational Pathobiology, Louisiana State University Health, Shreveport, LA, United States
| | - Gopi K. Kolluru
- Department of Pathology and Translational Pathobiology, Louisiana State University Health, Shreveport, LA, United States
| | - James Traylor
- Department of Pathology and Translational Pathobiology, Louisiana State University Health, Shreveport, LA, United States
| | - Mohammad Alfrad Nobel Bhuiyan
- Department of Internal Medicine, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
| | - Christopher G. Kevil
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
- Department of Pathology and Translational Pathobiology, Louisiana State University Health, Shreveport, LA, United States
| | - A. Wayne Orr
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
- Department of Pathology and Translational Pathobiology, Louisiana State University Health, Shreveport, LA, United States
| | - Oren Rom
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
- Department of Pathology and Translational Pathobiology, Louisiana State University Health, Shreveport, LA, United States
| | - Christopher B. Pattillo
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
| | - Md. Shenuarin Bhuiyan
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
- Department of Pathology and Translational Pathobiology, Louisiana State University Health, Shreveport, LA, United States
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Rashid S, Neice M, Canezaro H, Andrus V, Mubashir M, Raza SM, Traylor J, Takei H, Cai Q. Quantification of gastric muscle interstitial cells of Cajal in individuals with and without gastroparesis: a pilot study. Gastroenterol Rep (Oxf) 2024; 12:goae006. [PMID: 38455072 PMCID: PMC10918627 DOI: 10.1093/gastro/goae006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 12/21/2023] [Accepted: 12/22/2023] [Indexed: 03/09/2024] Open
Affiliation(s)
- Shazia Rashid
- Division of Gastroenterology and Hepatology, Louisiana State University, Health Sciences Center Shreveport, Shreveport, LA, 71103, USA
| | - Michelle Neice
- Division of Gastroenterology and Hepatology, Louisiana State University, Health Sciences Center Shreveport, Shreveport, LA, 71103, USA
| | - Hailey Canezaro
- Division of Gastroenterology and Hepatology, Louisiana State University, Health Sciences Center Shreveport, Shreveport, LA, 71103, USA
| | - Victoria Andrus
- Division of Gastroenterology and Hepatology, Louisiana State University, Health Sciences Center Shreveport, Shreveport, LA, 71103, USA
| | - Maryam Mubashir
- Division of Gastroenterology and Hepatology, Louisiana State University, Health Sciences Center Shreveport, Shreveport, LA, 71103, USA
| | - Syed Musa Raza
- Division of Gastroenterology and Hepatology, Louisiana State University, Health Sciences Center Shreveport, Shreveport, LA, 71103, USA
| | - James Traylor
- Department of Pathology, Louisiana State University Health Sciences Center Shreveport, Shreveport, LA 71103, USA
| | - Hidehiro Takei
- Department of Pathology, Louisiana State University Health Sciences Center Shreveport, Shreveport, LA 71103, USA
| | - Qiang Cai
- Division of Gastroenterology and Hepatology, Louisiana State University, Health Sciences Center Shreveport, Shreveport, LA, 71103, USA
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Ghrayeb A, Finney AC, Agranovich B, Peled D, Anand SK, McKinney MP, Sarji M, Yang D, Weissman N, Drucker S, Fernandes SI, Fernández-García J, Mahan K, Abassi Z, Tan L, Lorenzi PL, Traylor J, Zhang J, Abramovich I, Chen YE, Rom O, Mor I, Gottlieb E. Serine synthesis via reversed SHMT2 activity drives glycine depletion and acetaminophen hepatotoxicity in MASLD. Cell Metab 2024; 36:116-129.e7. [PMID: 38171331 PMCID: PMC10777734 DOI: 10.1016/j.cmet.2023.12.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 10/27/2023] [Accepted: 12/08/2023] [Indexed: 01/05/2024]
Abstract
Metabolic dysfunction-associated steatotic liver disease (MASLD) affects one-third of the global population. Understanding the metabolic pathways involved can provide insights into disease progression and treatment. Untargeted metabolomics of livers from mice with early-stage steatosis uncovered decreased methylated metabolites, suggesting altered one-carbon metabolism. The levels of glycine, a central component of one-carbon metabolism, were lower in mice with hepatic steatosis, consistent with clinical evidence. Stable-isotope tracing demonstrated that increased serine synthesis from glycine via reverse serine hydroxymethyltransferase (SHMT) is the underlying cause for decreased glycine in steatotic livers. Consequently, limited glycine availability in steatotic livers impaired glutathione synthesis under acetaminophen-induced oxidative stress, enhancing acute hepatotoxicity. Glycine supplementation or hepatocyte-specific ablation of the mitochondrial SHMT2 isoform in mice with hepatic steatosis mitigated acetaminophen-induced hepatotoxicity by supporting de novo glutathione synthesis. Thus, early metabolic changes in MASLD that limit glycine availability sensitize mice to xenobiotics even at the reversible stage of this disease.
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Affiliation(s)
- Alia Ghrayeb
- Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel
| | - Alexandra C Finney
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA
| | - Bella Agranovich
- Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel
| | - Daniel Peled
- Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel
| | - Sumit Kumar Anand
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA
| | - M Peyton McKinney
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA
| | - Mahasen Sarji
- Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel
| | - Dongshan Yang
- Center for Advanced Models for Translational Sciences and Therapeutics, University of Michigan Medical Center, Ann Arbor, MI 48109, USA; Department of Internal Medicine, Frankel Cardiovascular Center, University of Michigan, Ann Arbor, MI 48109, USA
| | - Natan Weissman
- Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel
| | - Shani Drucker
- Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel
| | - Sara Isabel Fernandes
- Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel
| | - Jonatan Fernández-García
- Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel
| | - Kyle Mahan
- Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel
| | - Zaid Abassi
- Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel
| | - Lin Tan
- Metabolomics Core Facility, Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Philip L Lorenzi
- Metabolomics Core Facility, Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - James Traylor
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA
| | - Jifeng Zhang
- Center for Advanced Models for Translational Sciences and Therapeutics, University of Michigan Medical Center, Ann Arbor, MI 48109, USA; Department of Internal Medicine, Frankel Cardiovascular Center, University of Michigan, Ann Arbor, MI 48109, USA
| | - Ifat Abramovich
- Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel
| | - Y Eugene Chen
- Center for Advanced Models for Translational Sciences and Therapeutics, University of Michigan Medical Center, Ann Arbor, MI 48109, USA; Department of Internal Medicine, Frankel Cardiovascular Center, University of Michigan, Ann Arbor, MI 48109, USA
| | - Oren Rom
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA; Department of Internal Medicine, Frankel Cardiovascular Center, University of Michigan, Ann Arbor, MI 48109, USA; Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA; Center for Cardiovascular Diseases and Sciences, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA.
| | - Inbal Mor
- Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel.
| | - Eyal Gottlieb
- Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel; Department of Cancer Biology, University of Texas MD Anderson Cancer Center, Houston, TX 77054, USA.
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Seeley EH, Liu Z, Yuan S, Stroope C, Cockerham E, Rashdan NA, Delgadillo L, Finney AC, Kumar D, Das S, Razani B, Liu W, Traylor J, Orr AW, Rom O, Pattillo CB, Yurdagul A. Spatially Resolved Metabolites in Stable and Unstable Human Atherosclerotic Plaques Identified by Mass Spectrometry Imaging. Arterioscler Thromb Vasc Biol 2023; 43:1626-1635. [PMID: 37381983 PMCID: PMC10527524 DOI: 10.1161/atvbaha.122.318684] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Accepted: 06/14/2023] [Indexed: 06/30/2023]
Abstract
BACKGROUND Impairments in carbohydrate, lipid, and amino acid metabolism drive features of plaque instability. However, where these impairments occur within the atheroma remains largely unknown. Therefore, we sought to characterize the spatial distribution of metabolites within stable and unstable atherosclerosis in both the fibrous cap and necrotic core. METHODS Atherosclerotic tissue specimens from 9 unmatched individuals were scored based on the Stary classification scale and subdivided into stable and unstable atheromas. After performing mass spectrometry imaging on these samples, we identified over 850 metabolite-related peaks. Using MetaboScape, METASPACE, and Human Metabolome Database, we confidently annotated 170 of these metabolites and found over 60 of these were different between stable and unstable atheromas. We then integrated these results with an RNA-sequencing data set comparing stable and unstable human atherosclerosis. RESULTS Upon integrating our mass spectrometry imaging results with the RNA-sequencing data set, we discovered that pathways related to lipid metabolism and long-chain fatty acids were enriched in stable plaques, whereas reactive oxygen species, aromatic amino acid, and tryptophan metabolism were increased in unstable plaques. In addition, acylcarnitines and acylglycines were increased in stable plaques whereas tryptophan metabolites were enriched in unstable plaques. Evaluating spatial differences in stable plaques revealed lactic acid in the necrotic core, whereas pyruvic acid was elevated in the fibrous cap. In unstable plaques, 5-hydroxyindoleacetic acid was enriched in the fibrous cap. CONCLUSIONS Our work here represents the first step to defining an atlas of metabolic pathways involved in plaque destabilization in human atherosclerosis. We anticipate this will be a valuable resource and open new avenues of research in cardiovascular disease.
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Affiliation(s)
- Erin H. Seeley
- Department of Chemistry, University of Texas at Austin, TX, USA
| | - Zhipeng Liu
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, IN, USA
| | - Shuai Yuan
- Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, PA, USA
| | - Chad Stroope
- Department of Molecular and Cellular Physiology, LSU Health Sciences Center at Shreveport, LA, USA
| | - Elizabeth Cockerham
- Department of Pathology and Translational Pathobiology, LSU Health Sciences Center at Shreveport, LA, USA
| | - Nabil A Rashdan
- Department of Molecular and Cellular Physiology, LSU Health Sciences Center at Shreveport, LA, USA
| | - Luisa Delgadillo
- Department of Molecular and Cellular Physiology, LSU Health Sciences Center at Shreveport, LA, USA
| | - Alexandra C Finney
- Department of Pathology and Translational Pathobiology, LSU Health Sciences Center at Shreveport, LA, USA
| | - Dhananjay Kumar
- Department of Molecular and Cellular Physiology, LSU Health Sciences Center at Shreveport, LA, USA
| | - Sandeep Das
- Department of Pathology and Translational Pathobiology, LSU Health Sciences Center at Shreveport, LA, USA
| | - Babak Razani
- Cardiovascular Division, Department of Medicine and Pathology & Immunology, Washington University School of Medicine, St. Louis, MO, USA
- John Cochran VA Medical Center, St. Louis, MO, USA
| | - Wanqing Liu
- Department of Pharmaceutical Sciences and Department of Pharmacology, Wayne State University, MI, USA
| | - James Traylor
- Department of Pathology and Translational Pathobiology, LSU Health Sciences Center at Shreveport, LA, USA
| | - A Wayne Orr
- Department of Molecular and Cellular Physiology, LSU Health Sciences Center at Shreveport, LA, USA
- Department of Pathology and Translational Pathobiology, LSU Health Sciences Center at Shreveport, LA, USA
| | - Oren Rom
- Department of Molecular and Cellular Physiology, LSU Health Sciences Center at Shreveport, LA, USA
- Department of Pathology and Translational Pathobiology, LSU Health Sciences Center at Shreveport, LA, USA
| | - Christopher B Pattillo
- Department of Molecular and Cellular Physiology, LSU Health Sciences Center at Shreveport, LA, USA
| | - Arif Yurdagul
- Department of Molecular and Cellular Physiology, LSU Health Sciences Center at Shreveport, LA, USA
- Department of Pathology and Translational Pathobiology, LSU Health Sciences Center at Shreveport, LA, USA
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Remex NS, Abdullah CS, Aishwarya R, Nitu SS, Traylor J, Hartman B, King J, Bhuiyan MAN, Kevil CG, Orr AW, Bhuiyan MS. Sigmar1 ablation leads to lung pathological changes associated with pulmonary fibrosis, inflammation, and altered surfactant proteins levels. Front Physiol 2023; 14:1118770. [PMID: 37051024 PMCID: PMC10083329 DOI: 10.3389/fphys.2023.1118770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 03/14/2023] [Indexed: 03/28/2023] Open
Abstract
Sigma1 receptor protein (Sigmar1) is a small, multifunctional molecular chaperone protein ubiquitously expressed in almost all body tissues. This protein has previously shown its cardioprotective roles in rodent models of cardiac hypertrophy, heart failure, and ischemia-reperfusion injury. Extensive literature also suggested its protective functions in several central nervous system disorders. Sigmar1's molecular functions in the pulmonary system remained unknown. Therefore, we aimed to determine the expression of Sigmar1 in the lungs. We also examined whether Sigmar1 ablation results in histological, ultrastructural, and biochemical changes associated with lung pathology over aging in mice. In the current study, we first confirmed the presence of Sigmar1 protein in human and mouse lungs using immunohistochemistry and immunostaining. We used the Sigmar1 global knockout mouse (Sigmar1-/-) to determine the pathophysiological role of Sigmar1 in lungs over aging. The histological staining of lung sections showed altered alveolar structures, higher immune cells infiltration, and upregulation of inflammatory markers (such as pNFκB) in Sigmar1-/- mice compared to wildtype (Wt) littermate control mice (Wt). This indicates higher pulmonary inflammation resulting from Sigmar1 deficiency in mice, which was associated with increased pulmonary fibrosis. The protein levels of some fibrotic markers, fibronectin, and pSMAD2 Ser 245/250/255 and Ser 465/467, were also elevated in mice lungs in the absence of Sigmar1 compared to Wt. The ultrastructural analysis of lungs in Wt mice showed numerous multilamellar bodies of different sizes with densely packed lipid lamellae and mitochondria with a dark matrix and dense cristae. In contrast, the Sigmar1-/- mice lung tissues showed altered multilamellar body structures in alveolar epithelial type-II pneumocytes with partial loss of lipid lamellae structures in the lamellar bodies. This was further associated with higher protein levels of all four surfactant proteins, SFTP-A, SFTP-B, SFTP-C, and SFTP-D, in the Sigmar1-/- mice lungs. This is the first study showing Sigmar1's expression pattern in human and mouse lungs and its association with lung pathophysiology. Our findings suggest that Sigmar1 deficiency leads to increased pulmonary inflammation, higher pulmonary fibrosis, alterations of the multilamellar body stuructures, and elevated levels of lung surfactant proteins.
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Affiliation(s)
- Naznin Sultana Remex
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
| | - Chowdhury S. Abdullah
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
| | - Richa Aishwarya
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
| | - Sadia S. Nitu
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
| | - James Traylor
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
| | - Brandon Hartman
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
| | - Judy King
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
| | - Mohammad Alfrad Nobel Bhuiyan
- Department of Internal Medicine, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
| | - Christopher G. Kevil
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
| | - A. Wayne Orr
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
| | - Md. Shenuarin Bhuiyan
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, United States
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Ghrayeb A, Agranovich B, Peled D, Finney AC, Abramovich I, Garcia JF, Traylor J, Drucker S, Fernandes SI, Weissman N, Chen YE, Rom O, Mor I, Gottlieb E. Fatty liver-mediated glycine restriction impairs glutathione synthesis and causes hypersensitization to acetaminophen. bioRxiv 2023:2023.01.16.524043. [PMID: 36711913 PMCID: PMC9882121 DOI: 10.1101/2023.01.16.524043] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Non-alcoholic fatty liver disease (NAFLD) affects nearly one third of the population worldwide. Understanding metabolic pathways involved can provide insights into disease progression. Untargeted metabolomics of livers from mice with early-stage steatosis indicated a decrease in methylated metabolites suggesting altered one carbon metabolism. The levels of glycine, a central component of one carbon metabolism, were lower in steatotic mice, in line with clinical evidence. Isotope tracing studies demonstrated that increased synthesis of serine from glycine is the underlying cause for glycine limitation in fatty livers. Consequently, the low glycine availability in steatotic livers impaired glutathione (GSH) synthesis under oxidative stress induced by acetaminophen (APAP), enhancing hepatic toxicity. Glycine supplementation mitigated acute liver damage and overall toxicity caused by APAP in fatty livers by supporting de novo GSH synthesis. Thus, early metabolic changes in NAFLD that lead to glycine depletion sensitize mice to xenobiotic toxicity even at a reversible stage of NAFLD.
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Abdullah CS, Remex NS, Aishwarya R, Nitu S, Kolluru GK, Traylor J, Hartman B, King J, Bhuiyan MAN, Hall N, Murnane KS, Goeders NE, Kevil CG, Orr AW, Bhuiyan MS. Mitochondrial dysfunction and autophagy activation are associated with cardiomyopathy developed by extended methamphetamine self-administration in rats. Redox Biol 2022; 58:102523. [PMID: 36335762 PMCID: PMC9641018 DOI: 10.1016/j.redox.2022.102523] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Accepted: 10/23/2022] [Indexed: 11/06/2022] Open
Abstract
The recent rise in illicit use of methamphetamine (METH), a highly addictive psychostimulant, is a huge health care burden due to its central and peripheral toxic effects. Mounting clinical studies have noted that METH use in humans is associated with the development of cardiomyopathy; however, preclinical studies and animal models to dissect detailed molecular mechanisms of METH-associated cardiomyopathy development are scarce. The present study utilized a unique very long-access binge and crash procedure of METH self-administration to characterize the sequelae of pathological alterations that occur with METH-associated cardiomyopathy. Rats were allowed to intravenously self-administer METH for 96 h continuous weekly sessions over 8 weeks. Cardiac function, histochemistry, ultrastructure, and biochemical experiments were performed 24 h after the cessation of drug administration. Voluntary METH self-administration induced pathological cardiac remodeling as indicated by cardiomyocyte hypertrophy, myocyte disarray, interstitial and perivascular fibrosis accompanied by compromised cardiac systolic function. Ultrastructural examination and native gel electrophoresis revealed altered mitochondrial morphology and reduced mitochondrial oxidative phosphorylation (OXPHOS) supercomplexes (SCs) stability and assembly in METH exposed hearts. Redox-sensitive assays revealed significantly attenuated mitochondrial respiratory complex activities with a compensatory increase in pyruvate dehydrogenase (PDH) activity reminiscent of metabolic remodeling. Increased autophagy flux and increased mitochondrial antioxidant protein level was observed in METH exposed heart. Treatment with mitoTEMPO reduced the autophagy level indicating the involvement of mitochondrial dysfunction in the adaptive activation of autophagy in METH exposed hearts. Altogether, we have reported a novel METH-associated cardiomyopathy model using voluntary drug seeking behavior. Our studies indicated that METH self-administration profoundly affects mitochondrial ultrastructure, OXPHOS SCs assembly and redox activity accompanied by increased PDH activity that may underlie observed cardiac dysfunction.
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Affiliation(s)
- Chowdhury S Abdullah
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Naznin Sultana Remex
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Richa Aishwarya
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Sadia Nitu
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Gopi K Kolluru
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - James Traylor
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Brandon Hartman
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Judy King
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Mohammad Alfrad Nobel Bhuiyan
- Department of Medicine, Division of Clinical Informatics, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Nicole Hall
- Department of Pharmacology, Toxicology and Neuroscience, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Kevin Sean Murnane
- Department of Pharmacology, Toxicology and Neuroscience, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA; Department of Psychiatry, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Nicholas E Goeders
- Department of Pharmacology, Toxicology and Neuroscience, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Christopher G Kevil
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA; Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - A Wayne Orr
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA; Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Md Shenuarin Bhuiyan
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA; Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA.
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8
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Remex NS, Abdullah CS, Aishwarya R, Morshed MM, Nitu S, Traylor J, Hartman B, King J, Kevil C, Orr AW, Bhuiyan MS. Sigmar1 Deficiency Results in Pulmonary Fibrosis Associated with Increased Pulmonary Inflammation and Surfactant Protein Levels in Mice Lung. FASEB J 2022. [DOI: 10.1096/fasebj.2022.36.s1.r2915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Naznin S. Remex
- Molecular and Cellular PhysiologyLouisiana State University Health Sciences Center ShreveportShreveportLA
| | | | - Richa Aishwarya
- PathologyLouisiana State University Health Sciences Center ShreveportShreveportLA
| | - Mohammed M. Morshed
- PathologyLouisiana State University Health Sciences Center ShreveportShreveportLA
| | - Sadia Nitu
- PathologyLouisiana State University Health Sciences Center ShreveportShreveportLA
| | - James Traylor
- PathologyLouisiana State University Health Sciences Center ShreveportShreveportLA
| | - Brandon Hartman
- Louisiana State University Health Sciences Center ShreveportShreveportLA
| | - Judy King
- PathologyLouisiana State University Health Sciences Center ShreveportShreveportLA
| | - Christopher Kevil
- PathologyLouisiana State University Health Sciences Center ShreveportShreveportLA
| | - Anthony W. Orr
- PathologyLouisiana State University Health Sciences Center ShreveportShreveportLA
| | - Md. S. Bhuiyan
- PathologyLouisiana State University Health Sciences Center ShreveportShreveportLA
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9
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Abdullah CS, Aishwarya R, Alam S, Remex NS, Morshed M, Nitu S, Miriyala S, Panchatcharam M, Hartman B, King J, Alfrad Nobel Bhuiyan M, Traylor J, Kevil CG, Orr AW, Bhuiyan MS. The molecular role of Sigmar1 in regulating mitochondrial function through mitochondrial localization in cardiomyocytes. Mitochondrion 2022; 62:159-175. [PMID: 34902622 PMCID: PMC8790786 DOI: 10.1016/j.mito.2021.12.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 12/02/2021] [Accepted: 12/06/2021] [Indexed: 01/03/2023]
Abstract
Sigmar1 is a widely expressed molecular chaperone protein in mammalian cell systems. Accumulating research demonstrated the cardioprotective roles of pharmacologic Sigmar1 activation by ligands in preclinical rodent models of cardiac injury. Extensive biochemical and immuno-electron microscopic research demonstrated Sigmar1's sub-cellular localization largely depends on cell and organ types. Despite comprehensive studies, Sigmar1's direct molecular role in cardiomyocytes remains elusive. In the present study, we determined Sigmar1's subcellular localization, transmembrane topology, and function using complementary microscopy, biochemical, and functional assays in cardiomyocytes. Quantum dots in transmission electron microscopy showed Sigmar1 labeled quantum dots on the mitochondrial membranes, lysosomes, and sarcoplasmic reticulum-mitochondrial interface. Subcellular fractionation of heart cell lysates confirmed Sigmar1's localization in purified mitochondria fraction and lysosome fraction. Immunocytochemistry confirmed Sigmar1 colocalization with mitochondrial proteins in isolated adult mouse cardiomyocytes. Sigmar1's mitochondrial localization was further confirmed by Sigmar1 colocalization with Mito-Tracker in isolated mouse heart mitochondria. A series of biochemical experiments, including alkaline extraction and proteinase K treatment of purified heart mitochondria, demonstrated Sigmar1 as an integral mitochondrial membrane protein. Sigmar1's structural requirement for mitochondrial localization was determined by expressing FLAG-tagged Sigmar1 fragments in cells. Full-length Sigmar1 and Sigmar1's C terminal-deletion fragments were able to localize to the mitochondrial membrane, whereas N-terminal deletion fragment was unable to incorporate into the mitochondria. Finally, functional assays using extracellular flux analyzer and high-resolution respirometry showed Sigmar1 siRNA knockdown significantly altered mitochondrial respiration in cardiomyocytes. Overall, we found that Sigmar1 localizes to mitochondrial membranes and is indispensable for maintaining mitochondrial respiratory homeostasis in cardiomyocytes.
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Affiliation(s)
- Chowdhury S Abdullah
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA
| | - Richa Aishwarya
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA
| | - Shafiul Alam
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA
| | - Naznin Sultana Remex
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA
| | - Mahboob Morshed
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA
| | - Sadia Nitu
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA
| | - Sumitra Miriyala
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA
| | - Manikandan Panchatcharam
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA
| | - Brandon Hartman
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA
| | - Judy King
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA
| | | | - James Traylor
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA
| | - Christopher G Kevil
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA; Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA; Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA
| | - A Wayne Orr
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA; Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA; Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA
| | - Md Shenuarin Bhuiyan
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA; Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA 71103, USA.
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10
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Georgescu MM, Islam MZ, Li Y, Traylor J, Nanda A. Novel targetable FGFR2 and FGFR3 alterations in glioblastoma associate with aggressive phenotype and distinct gene expression programs. Acta Neuropathol Commun 2021; 9:69. [PMID: 33853673 PMCID: PMC8048363 DOI: 10.1186/s40478-021-01170-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 03/27/2021] [Indexed: 02/07/2023] Open
Abstract
Prognostic molecular subgrouping of glioblastoma is an ongoing effort and the current classification includes IDH-wild-type and IDH-mutant entities, the latter showing significantly better prognosis. We performed a comparative integrated analysis of the FGFR glioblastoma subgroup consisting of 5 cases from a prospective 101-patient-cohort. FGFR alterations included FGFR2-TACC2 and FGFR2 amplifications arising in a multifocal IDH-mutant glioblastoma with unexpected 2.5-month patient survival, novel FGFR3 carboxy-terminal duplication and FGFR3-TLN1 fusion, and two previously described FGFR3-TACC3 fusions. The FGFR2 tumors showed additional mutations in SERPINE1/PAI-1 and MMP16, as part of extensive extracellular matrix remodeling programs. Whole transcriptomic analysis revealed common proliferation but distinct morphogenetic gene expression programs that correlated with tumor histology. The kinase program revealed EPHA3, LTK and ALK receptor tyrosine kinase overexpression in individual FGFR tumors. Paradoxically, all FGFR-fused glioblastomas shared strong PI3K and MAPK pathway suppression effected by SPRY, DUSP and AKAP12 inhibitors, whereas the FGFR2-TACC2 tumor elicited also EGFR suppression by ERRFI1 upregulation. This integrated analysis outlined the proliferation and morphogenetic expression programs in FGFR glioblastoma, and identified four novel, clinically targetable FGFR2 and FGFR3 alterations that confer aggressive phenotype and trigger canonical pathway feedback inhibition, with important therapeutic implications.
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11
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Trosclair K, Si M, Watts M, Gautier NM, Voigt N, Traylor J, Bitay M, Baczko I, Dobrev D, Hamilton KA, Bhuiyan MS, Dominic P, Glasscock E. Kv1.1 potassium channel subunit deficiency alters ventricular arrhythmia susceptibility, contractility, and repolarization. Physiol Rep 2021; 9:e14702. [PMID: 33427415 PMCID: PMC7798052 DOI: 10.14814/phy2.14702] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 11/30/2020] [Accepted: 12/01/2020] [Indexed: 12/11/2022] Open
Abstract
Epilepsy-associated Kv1.1 voltage-gated potassium channel subunits encoded by the Kcna1 gene have traditionally been considered absent in heart, but recent studies reveal they are expressed in cardiomyocytes where they could regulate intrinsic cardiac electrophysiology. Although Kv1.1 now has a demonstrated functional role in atria, its role in the ventricles has never been investigated. In this work, electrophysiological, histological, and gene expression approaches were used to explore the consequences of Kv1.1 deficiency in the ventricles of Kcna1 knockout (KO) mice at the organ, cellular, and molecular levels to determine whether the absence of Kv1.1 leads to ventricular dysfunction that increases the risk of premature or sudden death. When subjected to intracardiac pacing, KO mice showed normal baseline susceptibility to inducible ventricular arrhythmias (VA) but resistance to VA under conditions of sympathetic challenge with isoproterenol. Echocardiography revealed cardiac contractile dysfunction manifesting as decreased ejection fraction and fractional shortening. In whole-cell patch-clamp recordings, KO ventricular cardiomyocytes exhibited action potential prolongation indicative of impaired repolarization. Imaging, histological, and transcript analyses showed no evidence of structural or channel gene expression remodeling, suggesting that the observed deficits are likely electrogenic due to Kv1.1 deficiency. Immunoblots of patient heart samples detected the presence of Kv1.1 at relatively high levels, implying that Kv1.1 contributes to human cardiac electrophysiology. Taken together, this work describes an important functional role for Kv1.1 in ventricles where its absence causes repolarization and contractility deficits but reduced susceptibility to arrhythmia under conditions of sympathetic drive.
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Affiliation(s)
- Krystle Trosclair
- Department of Cellular Biology & AnatomyLouisiana State University Health Sciences CenterShreveportLAUSA
| | - Man Si
- Department of Cellular Biology & AnatomyLouisiana State University Health Sciences CenterShreveportLAUSA
| | - Megan Watts
- Department of Internal MedicineSection of CardiologyLouisiana State University Health Sciences CenterShreveportLAUSA
| | - Nicole M. Gautier
- Department of Cellular Biology & AnatomyLouisiana State University Health Sciences CenterShreveportLAUSA
| | - Niels Voigt
- Institute of Pharmacology and ToxicologyUniversity Medical Center GoettingenGoettingenGermany
- DZHK (German Center for Cardiovascular Research)GöttingenGermany
| | - James Traylor
- Department of PathologyLouisiana State University Health Sciences CenterShreveportLAUSA
| | - Miklós Bitay
- Department of Cardiac Surgery2nd Department of Medicine and Cardiology CenterUniversity of SzegedSzegedHungary
| | - Istvan Baczko
- Department of Pharmacology and PharmacotherapyInterdisciplinary Excellence CentreUniversity of SzegedSzegedHungary
| | - Dobromir Dobrev
- Institute of PharmacologyWest German Heart and Vascular CenterUniversity Duisburg‐EssenEssenGermany
| | - Kathryn A. Hamilton
- Department of Cellular Biology & AnatomyLouisiana State University Health Sciences CenterShreveportLAUSA
| | - Md. Shenuarin Bhuiyan
- Department of PathologyLouisiana State University Health Sciences CenterShreveportLAUSA
| | - Paari Dominic
- Department of Internal MedicineSection of CardiologyLouisiana State University Health Sciences CenterShreveportLAUSA
| | - Edward Glasscock
- Department of Cellular Biology & AnatomyLouisiana State University Health Sciences CenterShreveportLAUSA
- Department of Biological SciencesSouthern Methodist UniversityDallasTXUSA
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12
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Abdullah CS, Aishwarya R, Alam S, Morshed M, Remex NS, Nitu S, Kolluru GK, Traylor J, Miriyala S, Panchatcharam M, Hartman B, King J, Bhuiyan MAN, Chandran S, Woolard MD, Yu X, Goeders NE, Dominic P, Arnold CL, Stokes K, Kevil CG, Orr AW, Bhuiyan MS. Methamphetamine induces cardiomyopathy by Sigmar1 inhibition-dependent impairment of mitochondrial dynamics and function. Commun Biol 2020; 3:682. [PMID: 33203971 PMCID: PMC7673131 DOI: 10.1038/s42003-020-01408-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Methamphetamine-associated cardiomyopathy is the leading cause of death linked with illicit drug use. Here we show that Sigmar1 is a therapeutic target for methamphetamine-associated cardiomyopathy and defined the molecular mechanisms using autopsy samples of human hearts, and a mouse model of "binge and crash" methamphetamine administration. Sigmar1 expression is significantly decreased in the hearts of human methamphetamine users and those of "binge and crash" methamphetamine-treated mice. The hearts of methamphetamine users also show signs of cardiomyopathy, including cellular injury, fibrosis, and enlargement of the heart. In addition, mice expose to "binge and crash" methamphetamine develop cardiac hypertrophy, fibrotic remodeling, and mitochondrial dysfunction leading to contractile dysfunction. Methamphetamine treatment inhibits Sigmar1, resulting in inactivation of the cAMP response element-binding protein (CREB), decreased expression of mitochondrial fission 1 protein (FIS1), and ultimately alteration of mitochondrial dynamics and function. Therefore, Sigmar1 is a viable therapeutic agent for protection against methamphetamine-associated cardiomyopathy.
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Affiliation(s)
- Chowdhury S Abdullah
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Richa Aishwarya
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Shafiul Alam
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Mahboob Morshed
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Naznin Sultana Remex
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Sadia Nitu
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Gopi K Kolluru
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - James Traylor
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Sumitra Miriyala
- Department of Cell Biology and Anatomy, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Manikandan Panchatcharam
- Department of Cell Biology and Anatomy, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Brandon Hartman
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Judy King
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | | | - Sunitha Chandran
- Department of Microbiology and Immunology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Matthew D Woolard
- Department of Microbiology and Immunology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Xiuping Yu
- Department of Biochemistry and Molecular Biology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Nicholas E Goeders
- Department of Pharmacology, Toxicology and Neuroscience, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Paari Dominic
- Department of Medicine, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Connie L Arnold
- Department of Medicine, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Karen Stokes
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Christopher G Kevil
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
- Department of Cell Biology and Anatomy, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - A Wayne Orr
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
- Department of Cell Biology and Anatomy, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA
| | - Md Shenuarin Bhuiyan
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA.
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center-Shreveport, Shreveport, LA, 71103, USA.
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13
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Lin E, Runge M, Aaby D, Traylor J, Nixon K, Chaudhari A, Tsai S, Trinkus V, DeStephano C, Milad M. Comparing Proficiency of Laparoscopic Vaginal Cuff Suturing in Naïve Learners after Training with Two Different Laparoscopic Simulators. J Minim Invasive Gynecol 2020. [DOI: 10.1016/j.jmig.2020.08.304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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Traylor J, Simon M, Tsai S, Feinglass J. Patient and Hospital Characteristics Associated with Minimally Invasive Hysterectomy. Evidence from 143 Illinois Hospitals, 2016-2018. J Minim Invasive Gynecol 2020. [DOI: 10.1016/j.jmig.2020.08.375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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15
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Lin E, Runge M, Aaby D, Duyar S, Traylor J, Nixon K, Chaudhari A, Tsai S, Trinkus V, DeStephano C, Milad M. Comparing Participant-Reported Confidence during Laparoscopic Vaginal Cuff Suturing after Training with Two Laparoscopic Simulators. J Minim Invasive Gynecol 2020. [DOI: 10.1016/j.jmig.2020.08.593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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16
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Georgescu MM, Islam MZ, Li Y, Circu ML, Traylor J, Notarianni CM, Kline CN, Burns DK. Global activation of oncogenic pathways underlies therapy resistance in diffuse midline glioma. Acta Neuropathol Commun 2020; 8:111. [PMID: 32680567 PMCID: PMC7367358 DOI: 10.1186/s40478-020-00992-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Accepted: 07/08/2020] [Indexed: 12/18/2022] Open
Abstract
Diffuse midline gliomas (DMGs) are aggressive pediatric brain tumors with dismal prognosis due to therapy-resistant tumor growth and invasion. We performed the first integrated histologic/genomic/proteomic analysis of 21 foci from three pontine DMG cases with supratentorial dissemination. Histone H3.3-K27M was the driver mutation, usually at high variant allele fraction due to recurrent chromosome 1q copy number gain, in combination with germline variants in ATM, FANCM and MYCN genes. Both previously reported and novel recurrent copy number variations and somatic pathogenic mutations in chromatin remodeling, DNA damage response and PI3K/MAPK growth pathways were variably detected, either in multiple or isolated foci. Proteomic analysis showed global upregulation of histone H3, lack of H3-K27 trimethylation, and further impairment of polycomb repressive complex 2 by ASXL1 downregulation. Activation of oncogenic pathways resulted from combined upregulation of N-MYC, SOX2, p65/p50 NF-κB and STAT3 transcription factors, EGFR, FGFR2, PDGFRα/β receptor tyrosine kinases, and downregulation of PHLPP1/2, PTEN and p16/INK4A tumor suppressors. Upregulation of SMAD4, PAI-1, CD44, and c-SRC in multiple foci most likely contributed to invasiveness. This integrated comprehensive analysis revealed a complex spatiotemporal evolution in diffuse intrisic pontine glioma, recommending pontine and cerebellar biopsies for accurate populational genetic characterization, and delineated common signaling pathways and potential therapeutic targets. It also revealed an unsuspected activation of a multitude of oncogenic pathways, including cancer cell reprogramming, explaining the resistance of DMG to current therapies.
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Von Lotten M, Abdullah CS, Aishwarya R, Alam S, Morshed M, Remex NS, Orr AW, Goeders NE, Kevil CG, Hartman B, King JA, Traylor J, Bhuiyan MS. Metabolic Alterations in Cardiomyocytes are Associated with Methamphetamine‐Induced Cardiomyopathy. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.06923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | - Richa Aishwarya
- Louisiana State University Health Sciences Center-Shreveport
| | - Shafiul Alam
- Louisiana State University Health Sciences Center-Shreveport
| | - Mahboob Morshed
- Louisiana State University Health Sciences Center-Shreveport
| | | | - A. Wayne Orr
- Louisiana State University Health Sciences Center-Shreveport
| | | | | | - Brandon Hartman
- Louisiana State University Health Sciences Center-Shreveport
| | - Judy A. King
- Louisiana State University Health Sciences Center-Shreveport
| | - James Traylor
- Louisiana State University Health Sciences Center-Shreveport
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18
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Traylor J, Friedman J, Milad MP. Laparoscopic Relocation of the Ovaries After Prior Transposition. J Minim Invasive Gynecol 2019. [DOI: 10.1016/j.jmig.2019.09.053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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19
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Traylor J, Friedman J, Runge M, Tsai SC, Chaudhari A, Milad MP. 1180 Factors that Influence Applicants Pursuing A Fellowship in Minimally Invasive Gynecologic Surgery (FMIGS). J Minim Invasive Gynecol 2019. [DOI: 10.1016/j.jmig.2019.09.265] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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20
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Persenaire C, Duyar S, Traylor J, Tsai SC, Chaudhari A. 2170 Vaginoscopy: A Minimally Invasive Approach to Hysteroscopy. J Minim Invasive Gynecol 2019. [DOI: 10.1016/j.jmig.2019.09.388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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21
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Guo XM, Traylor J, Milad MP. Laparoscopic Resection of a Hydropic Leiomyoma. J Minim Invasive Gynecol 2019. [DOI: 10.1016/j.jmig.2019.09.602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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22
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Abdullah CS, Aishwarya R, Alam S, Morshed M, Kolluru GK, Traylor J, Miriyala S, Panchatcharam M, Woolard MD, Goeders NE, Lu XH, Dominic PS, Kevil CG, Orr AW, Harris NR, Gavins FNE, Bhuiyan MS. Abstract 120: Methamphetamine-induced Cardiomyopathy Associated With Mitochondrial Dysfunction, Cardiac Fibrosis and Hypertrophy. Circ Res 2019. [DOI: 10.1161/res.125.suppl_1.120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Introduction:
Methamphetamine (METH) is one of the most commonly abused illicit drugs in the United States, exerting a range of adverse effects upon multiple organ systems. Cardiovascular complications are among the major causes of death in METH users. METH-induced cardiomyopathy is a poorly characterized disease entity as METH-induced molecular perturbations, and histopathological changes in the heart remain under-explored.
Objectives:
We studied histopathology in the hearts of human METH users. We also observed the histological alteration and changes in mitochondrial function in mice that received ‘binge’ administration of METH.
Methods and Results:
We obtained 32 autopsy heart samples from humans with positive toxicology for chronic METH use and performed Sirius Red and Masson’s Trichrome (MT) staining on left ventricular (LV) sections. Notably, chronic METH user hearts showed intense perivascular and interstitial fibrosis in LVs. ‘Binge’ METH administration in mice for 4 weeks showed an increase in heart weight-to-tibia length and increase in myocyte cross-sectional area in WGA stained LVs compared to saline-treated mice. Sirius red and MT staining also showed an increase in perivascular and interstitial fibrosis in METH mice heart. Isolated mitochondria from METH-treated mice heart showed suppressed mitochondrial bioenergetics measured by Seahorse Analyzer. Immunoblotting in heart lysates and mitochondrial fractions showed altered mitochondrial dynamics regulatory proteins expression in METH mice compared to control saline group. METH-treated cultured neonatal rat ventricular cardiomyocytes also showed suppression of mitochondrial respiration and mitochondrial network disorganization indicating a direct effect of METH on cardiomyocytes.
Conclusions:
We report that maladaptive cardiac fibrotic remodeling is typical in a human and pre-clinical mouse model of METH abuse. ‘Binge’ METH exposure in mice induces cardiac hypertrophy, cardiac fibrosis, and suppression of mitochondrial respiration. Thus, chronic METH use induces maladaptive cardiac remodeling associated with mitochondrial dysfunction.
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Affiliation(s)
- Chowdhury S Abdullah
- Dept of Pathology and Translational Pathobiology, Louisiana State Univ Health Sciences Cntr-Shreveport, Shreveport, LA
| | - Richa Aishwarya
- Dept of Molecular and Cellular Physiology, Louisiana State Univ Health Sciences Cntr-Shreveport, SHREVEPORT, LA
| | - Shafiul Alam
- Dept of Pathology and Translational Pathobiology, Louisiana State Univ Health Sciences Cntr-Shreveport, Shreveport, LA
| | - Mahboob Morshed
- Dept of Pathology and Translational Pathobiology, Louisiana State Univ Health Sciences Cntr-Shreveport, Shreveport, LA
| | - Gopi K Kolluru
- Dept of Pathology and Translational Pathobiology, Louisiana State Univ Health Sciences Cntr-Shreveport, Shreveport, LA
| | - James Traylor
- Dept of Pathology and Translational Pathobiology, Louisiana State Univ Health Sciences Cntr-Shreveport, Shreveport, LA
| | - Sumitra Miriyala
- Dept of Cellular Biology and Anatomy, Louisiana State Univ Health Sciences Cntr-Shreveport, Shreveport, LA
| | - Manikandan Panchatcharam
- Dept of Cellular Biology and Anatomy, Louisiana State Univ Health Sciences Cntr-Shreveport, Shreveport, LA
| | - Matthew D Woolard
- Dept of Microbiology and Immunology, Louisiana State Univ Health Sciences Cntr-Shreveport, Shreveport, LA
| | - Nicholas E Goeders
- Dept of Pharmacology, Toxicology and Neuroscience, Louisiana State Univ Health Sciences Cntr-Shreveport, Shreveport, LA
| | - Xioa-Hong Lu
- Dept of Pharmacology, Toxicology and Neuroscience, Louisiana State Univ Health Sciences Cntr-Shreveport, Shreveport, LA
| | - Paari S Dominic
- Div of Cardiology and Internal Medicine, Louisiana State Univ Health Sciences Cntr-Shreveport, Shreveport, LA
| | - Christopher G Kevil
- Dept of Pathology and Translational Pathobiology, Louisiana State Univ Health Sciences Cntr-Shreveport, Shreveport, LA
| | - A. Wayne Orr
- Dept of Pathology and Translational Pathobiology, Louisiana State Univ Health Sciences Cntr-Shreveport, Shreveport, LA
| | - Norman R Harris
- Dept of Molecular and Cellular Physiology, Louisiana State Univ Health Sciences Cntr-Shreveport, Shreveport, LA
| | - Felicity N. E Gavins
- Dept of Molecular and Cellular Physiology, Louisiana State Univ Health Sciences Cntr-Shreveport, Shreveport, LA
| | - Md. Shenuarin Bhuiyan
- Dept of Pathology and Translational Pathobiology, Louisiana State Univ Health Sciences Cntr-Shreveport, Shreveport, LA
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Friedman J, Wong J, Traylor J, Milad M. 33: Laparoscopic excision of deep infiltrating rectovaginal endometriosis: tips and tricks to ensure a complete, safe excision. Am J Obstet Gynecol 2019. [DOI: 10.1016/j.ajog.2019.01.169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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King N, Friedman J, Lin E, Traylor J, Wong J, Tsai S, Chaudhari A, Milad M. 102: Systematic review of major vascular injuries (MVI) during gynecologic lapraroscopy for benign indications. Am J Obstet Gynecol 2019. [DOI: 10.1016/j.ajog.2019.01.132] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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25
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Traylor J, Koelper N, Kim S, Sammel M, Andy U. Impact of Delay to Hysterectomy for Benign Gynecologic Disease. J Minim Invasive Gynecol 2018. [DOI: 10.1016/j.jmig.2018.09.326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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26
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Alam S, Abdullah CS, Aishwarya R, Orr AW, Traylor J, Miriyala S, Panchatcharam M, Pattillo CB, Bhuiyan MS. Sigmar1 regulates endoplasmic reticulum stress-induced C/EBP-homologous protein expression in cardiomyocytes. Biosci Rep 2017; 37:BSR20170898. [PMID: 28667101 PMCID: PMC5518542 DOI: 10.1042/bsr20170898] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Revised: 06/27/2017] [Accepted: 06/29/2017] [Indexed: 01/09/2023] Open
Abstract
C/EBP-homologous protein (CHOP) is a ubiquitously expressed stress-inducible transcription factor robustly induced by maladaptive endoplasmic reticulum (ER) stresses in a wide variety of cells. Here, we examined a novel function of Sigma 1 receptor (Sigmar1) in regulating CHOP expression under ER stress in cardiomyocytes. We also defined Sigmar1-dependent activation of the adaptive ER-stress pathway in regulating CHOP expression. We used adenovirus-mediated Sigmar1 overexpression as well as Sigmar1 knockdown by siRNA in neonatal rat ventricular cardiomyocytes (NRCs); to induce ER stress, cardiomyocytes were treated with tunicamycin. Sigmar1-siRNA knockdown significantly increased the expression of CHOP and significantly induced cellular toxicity by sustained activation of ER stress in cardiomyocytes. Sigmar1 overexpression decreased the expression of CHOP and significantly decreased cellular toxicity in cells. Using biochemical and immunocytochemical experiments, we also defined the specific ER-stress pathway associated with Sigmar1-dependent regulation of CHOP expression and cellular toxicity. We found that Sigmar1 overexpression significantly increased inositol requiring kinase 1α (IRE1α) phosphorylation and increased spliced X-box-binding proteins (XBP1s) expression as well as nuclear localization. In contrast, Sigmar1 knockdown significantly decreased IRE1α phosphorylation and decreased XBP1s expression as well as nuclear transport. Taken together, these results indicate that Sigmar1-dependent activation of IRE1α-XBP1s ER-stress response pathways are associated with inhibition of CHOP expression and suppression of cellular toxicity. Hence, Sigmar1 is an essential component of the adaptive ER-stress response pathways eliciting cellular protection in cardiomyocytes.
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Affiliation(s)
- Shafiul Alam
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center, Shreveport, LA 71103, U.S.A
| | - Chowdhury S Abdullah
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center, Shreveport, LA 71103, U.S.A
| | - Richa Aishwarya
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center, Shreveport, LA 71103, U.S.A
| | - A Wayne Orr
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center, Shreveport, LA 71103, U.S.A
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center, Shreveport, LA 71103, U.S.A
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, LA 71103, U.S.A
| | - James Traylor
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center, Shreveport, LA 71103, U.S.A
| | - Sumitra Miriyala
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, LA 71103, U.S.A
| | - Manikandan Panchatcharam
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, LA 71103, U.S.A
| | - Christopher B Pattillo
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center, Shreveport, LA 71103, U.S.A
| | - Md Shenuarin Bhuiyan
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center, Shreveport, LA 71103, U.S.A.
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center, Shreveport, LA 71103, U.S.A
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Lockhart V, Traylor J. Meconium Peritonitis in a Newborn: The Value of Performing Hospital Autopsies. Am J Clin Pathol 2016. [DOI: 10.1093/ajcp/aqw162.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Lockhart V, Traylor J. Primary Cardiac Angiosarcoma: A Rare Finding at Autopsy. Am J Clin Pathol 2016. [DOI: 10.1093/ajcp/aqw162.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Bush NC, Keays M, Adams C, Mizener K, Pritzker K, Smith W, Traylor J, Villanueva C, Snodgrass WT. Renal damage detected by DMSA, despite normal renal ultrasound, in children with febrile UTI. J Pediatr Urol 2015; 11:126.e1-7. [PMID: 25842992 DOI: 10.1016/j.jpurol.2015.01.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Accepted: 01/21/2015] [Indexed: 10/23/2022]
Abstract
OBJECTIVES 2011 American Academy of Pediatrics guidelines recommended renal-bladder ultrasound (RBUS) as the only evaluation after febrile urinary tract infection (FUTI) in infants aged 2-24 months. We determined the sensitivity, specificity, and false negative rate of RBUS to identify DMSA-detected renal damage in this age group as well as in older children. METHODS Consecutive patients referred to pediatric urology with a history of FUTI underwent DMSA ≥ 3 months after FUTI. Abnormal RBUS was defined as: Society of Fetal Urology hydronephrosis grades I-IV; hydroureter ≥ 7 mm; renal scar defined as focal parenchymal thinning; and/or size discrepancy ≥ 1 cm between kidneys. Abnormal DMSA was presence of any focal uptake defects and/or split renal function < 44%. We calculated sensitivity, specificity, positive and negative predictive values, and false negative rates of RBUS compared to DMSA. RESULTS 618 patients (79% female), median age 3.4 years, were referred for FUTIs. Of the 512 (83%) with normal RBUS, 99 (19%) had abnormal DMSA. Children with normal RBUS after their first FUTI had abnormal DMSA in 15/151 (10%) aged ≤ 24 months and 23/119 (19%) aged > 24 months. RBUS had poor sensitivity (34%) and low positive predictive value (47%) to identify patients with renal damage. 99/149 (66%) children with renal damage on DMSA had normal RBUS. CONCLUSION After FUTI, 66% of children with reduced renal function and/or renal cortical defects found by DMSA scintigraphy had a normal RBUS. Since abnormal DMSA may correlate with increased risk for VUR, recurrent FUTI and renal damage, our data suggest RBUS alone will fail to detect a significant proportion of patients at risk. The data suggest that imaging after FUTI should include acute RBUS and delayed DMSA, reserving VCUG for patients with abnormal DMSA and/or recurrent FUTI.
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Affiliation(s)
- N C Bush
- Pediatric & Adult Reconstructive Center for Urology, Dallas, TX, USA.
| | - M Keays
- Children's Hospital of Eastern Ontario, Ottawa, Canada.
| | - C Adams
- University of Texas Southwestern, Dallas, TX, USA
| | - K Mizener
- Pediatric & Adult Reconstructive Center for Urology, Dallas, TX, USA.
| | - K Pritzker
- University of Texas Southwestern, Dallas, TX, USA
| | - W Smith
- University of Texas Southwestern, Dallas, TX, USA
| | - J Traylor
- University of Texas Southwestern, Dallas, TX, USA
| | - C Villanueva
- Children's Hospital and Medical Center, University of Nebraska, Omaha, NE, USA
| | - W T Snodgrass
- Pediatric & Adult Reconstructive Center for Urology, Dallas, TX, USA.
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Cromer WE, Ganta CV, Patel M, Traylor J, Kevil CG, Alexander JS, Mathis JM. VEGF-A isoform modulation in an preclinical TNBS model of ulcerative colitis: protective effects of a VEGF164b therapy. J Transl Med 2013; 11:207. [PMID: 24020796 PMCID: PMC3848761 DOI: 10.1186/1479-5876-11-207] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2013] [Accepted: 08/28/2013] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Ulcerative colitis (UC) is the most common form of inflammatory bowel disease in the USA. A key component of UC is the increase in inflammatory angiogenesis of the colon during active disease. This increase is driven to a great extent by the over expression of VEGF-A. Recently, VEGF165(b) (VEGF164(b) in mouse), an anti-angiogenic form of VEGF-A was described and its regulation was determined to be disturbed in many pathologies such as cancer and pre-eclampsia. RESULTS The aims of this study were to examine the role of this inhibitory VEGF by expressing this molecule in a model of intestinal inflammation, and to evaluate its expression as a potential new therapeutic approach for treating UC. A modified model of TNBS colitis was used to determine the effects of rVEGF164(b) expression on colon inflammation. Expansion of the vascular system was assessed by immunhistochemical methods and macro- and microscopic measurements of inflammation in the colon were measured. Leukocyte invasion of the tissue was measured by myeloperoxidase assay and identification and counting of lymphoid follicles. Both angio- and lymphangiogenesis were reduced by expression of rVEGF164(b), which correlated with reduction in both gross and microscopic inflammatory scores. Leukocyte invasion of the tissue was also reduced by rVEGF164(b) expression. CONCLUSIONS This is the first report using an endogenous inhibitory VEGF-A isoform for therapy in a model of experimental colitis. Inhibitory VEGF molecules play an important role in maintenance of gut homeostasis and may be dysregulated in UC. The results of this study suggest that restoration of rVEGF164(b) expression has anti-inflammatory activity in a TNBS model and warrants further examination as a possible therapeutic for UC.
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Affiliation(s)
- Walter E Cromer
- Gene Therapy Program, LSU Health Sciences Center, 1501 Kings Highway, Shreveport, LA 71130-3932, USA.
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31
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Sequeira A, Parimoo N, Wilson J, Traylor J, Bonsib S, Abreo K. Polymer Embolization From Minimally Invasive Interventions. Am J Kidney Dis 2013; 61:984-7. [DOI: 10.1053/j.ajkd.2012.12.021] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Accepted: 12/11/2012] [Indexed: 11/11/2022]
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32
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Suratwala D, Chan JSH, Kelly A, Meltzer LJ, Gallagher PR, Traylor J, Rubenstein RC, Marcus CL. Nocturnal saturation and glucose tolerance in children with cystic fibrosis. Thorax 2011; 66:574-8. [DOI: 10.1136/thx.2010.142141] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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33
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Ganta VC, Cromer W, Mills GL, Traylor J, Jennings M, Daley S, Clark B, Michael Mathis J, Bernas M, Jordan P, Witte M, Steven Alexander J, Alexander JS. Angiopoietin-2 in experimental colitis. Inflamm Bowel Dis 2010; 16:1029-39. [PMID: 19902545 PMCID: PMC2881632 DOI: 10.1002/ibd.21150] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BACKGROUND The pathophysiology of inflammatory bowel disease (IBD) includes leukocyte infiltration, blood and lymphatic remodeling, weight loss and protein enteropathy. The roles of angiopoietin-2 (Ang-2) in initiating gut inflammation, leukocyte infiltration and angiogenesis are not well understood. METHODS Disease activity index, histopathological scoring, myeloperoxidase assay, immunohistochemistry and sodium dodecyl sulphate- polyacrylamide gel electrophoretic methods were employed in the present study to address the roles of Ang-2 in experimental colitis. RESULTS Several important differences were seen in the development of experimental IBD in Ang-2(-/-) mice. Although weight change and disease activity differ only slightly in WT and Ang-2(-/-) + DSS treated mice, leukocyte infiltration, inflammation and blood and lymphatic vessel density is significantly attenuated compared to WT + DSS mice. Gut capillary fragility and water export (stool blood and form) appear significantly earlier in Ang-2(-/-) + DSS mice vs. WT. Colon lengths were also significantly reduced in Ang-2(-/-) and gut histopathology was less severe in Ang-2(-/-) compared to WT + DSS. Lastly, the decrease in serum protein content in WT + DSS was less severe in Ang-2(-/-) + DSS, thus protein losing enteropathy (PLE) a feature of IBD is relieved by Ang-2(-/-). CONCLUSION These data demonstrate that in DSS colitis, Ang-2 mediates inflammatory hemangiogenesis, lymphangiogenesis and neutrophil infiltration to reduce some, but not all clinical features of IBD. The implications for Ang-2 manipulation in the development of IBD and other inflammatory diseases and treatments involving Ang-2 are discussed.
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Affiliation(s)
- Vijay C. Ganta
- Department of Molecular and Cellular Physiology, Louisiana Health Sciences Centre-Shreveport, Louisiana
| | - Walter Cromer
- Department of Cell Biology and Anatomy Louisiana Health Sciences Centre-Shreveport, Louisiana
| | - Ginny L. Mills
- Department of Molecular and Cellular Physiology, Louisiana Health Sciences Centre-Shreveport, Louisiana
| | - James Traylor
- Department of Pathology Louisiana Health Sciences Centre-Shreveport, Louisiana
| | - Merilyn Jennings
- Department of Molecular and Cellular Physiology, Louisiana Health Sciences Centre-Shreveport, Louisiana
| | - Sarah Daley
- Department of Surgery, University of Arizona, Arizona
| | - Benjamin Clark
- Department of Molecular and Cellular Physiology, Louisiana Health Sciences Centre-Shreveport, Louisiana
| | - J. Michael Mathis
- Department of Cell Biology and Anatomy Louisiana Health Sciences Centre-Shreveport, Louisiana
| | | | - Paul Jordan
- Department of Gastroenterology, University of Arizona, Arizona
| | - Marlys Witte
- Department of Surgery, University of Arizona, Arizona
| | - J. Steven Alexander
- Department of Molecular and Cellular Physiology, Louisiana Health Sciences Centre-Shreveport, Louisiana
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Wayland M, Alisauskas RT, Kellett D, Traylor J, Swoboda C, Neugebauer E, Mehl K. Year-to-year correlations in blood metal levels among individuals of two species of North American sea ducks. Environ Pollut 2007; 150:329-37. [PMID: 17376567 DOI: 10.1016/j.envpol.2007.01.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2006] [Revised: 01/23/2007] [Accepted: 01/27/2007] [Indexed: 05/14/2023]
Abstract
Sea duck populations have declined in North America. Contaminants, especially metals, have been listed as possible contributing factors. Sea ducks are long-lived. Thus, individuals chronically exposed to elevated metal levels may be at greatest risk. Information about long-term exposure (> or =1year) of individuals to metals is absent. To address this information gap, we examined year-to-year correlations among individual White-Winged Scoters and King Eiders in levels of blood cadmium, lead, mercury and selenium. Positive correlations (r> or =0.43), were found in six, five, five and two of seven correlations for cadmium, selenium, lead and mercury. Thus, certain individuals of these species may be exposed over two or more years to higher levels of cadmium, selenium and lead (but apparently not mercury) than other individuals. Single blood samples are appropriate metrics of exposure for studies that examine long-term effects of certain metals on these birds.
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Affiliation(s)
- M Wayland
- Environment Canada, Prairie & Northern Region, 115 Perimeter Rd., Saskatoon, SK, S7N 0X4, Canada.
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Traylor J. Positron emission tomography: a first-hand experience. Radiol Manage 2000; 22:41-7. [PMID: 10787761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
In July 1999, the University of Kansas Hospital installed a positron emission tomography (PET) scanner and added PET to the imaging technologies it offers patients and physicians. The new service is managed by the nuclear medicine section in the department of radiology. Plans are being implemented now to install a cyclotron in March 2000. Prior to installation of the scanner, a radiation area survey was performed in the space being considered for the PET unit. We also needed to address other critical considerations, including the manufacturer's requirements for construction of the scanner room, special electrical needs, and how the system would connect to our existing information network. It is important to work closely with your chief financial officer and chief operations officer from the beginning of the purchasing process so that these administrators have up-to-date, supportive information about PET and the progress of the installation. We made use of a variety of promotional techniques to market the new service, including broadcast e-mail, an open house for potential referring physicians, postings on the nuclear medicine Web site and communication through the local media. We also worked with the major insurance providers that utilize our hospital to educate them about PET and its benefits. In addition, we trained our own billing staff about procedures that optimize reimbursement for PET. In March 2000, University of Kansas Hospital will install the first cyclotron in the state, enabling us to generate the drugs used for PET scanning and potentially to add targets for research PET radiopharmaceuticals.
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Affiliation(s)
- J Traylor
- Kansas Hospital in Kansas City, KS, USA.
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36
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Jensen PS, Irwin RA, Josephson AM, Davis H, Xenakis SN, Bloedau L, Ness R, Mabe A, Lee B, Traylor J, Clawson L. Data-gathering tools for "real world" clinical settings: a multisite feasibility study. J Am Acad Child Adolesc Psychiatry 1996; 35:55-66. [PMID: 8567613 DOI: 10.1097/00004583-199601000-00013] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
OBJECTIVE To determine the mental health needs and optimal treatments for children and families in "real world" settings, data-gathering strategies are needed that can be easily implemented across a variety of clinical settings. To address this need, the authors developed and piloted a "clinician-friendly" questionnaire that includes demographic, psychosocial, medical, and family history variables, such as those routinely gathered in standard clinical evaluations. METHOD Optical scanning technology was used to encode data from more than 1,900 children, including 1,458 consecutive referrals in four military child psychiatry clinics, 285 consecutive admissions to a civilian psychiatric state hospital, 71 pediatric patients, and a community sample of 113 children. RESULTS Despite geographic and logistic obstacles, clinical data were reliably obtained across multiple settings. Data analyses revealed meaningful differences across samples in subjects' presenting complaints, and a range of psychosocial, demographic, and background variables. Data were characterized by an apparently high degree of accuracy and completeness. CONCLUSIONS Findings illustrate the importance and feasibility of standardized data-gathering approaches in routine clinical settings and clarify the hazards as well as the opportunities afforded by these research approaches. Such data-gathering tools appear to have significant merit and deserve further implementation and testing across a range of clinical and research settings.
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Affiliation(s)
- P S Jensen
- Child and Adolescent Disorders Research Branch, NIMH, Rockville, MD 20857, USA
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Jensen PS, Traylor J, Xenakis SN, Davis H. Child psychopathology rating scales and interrater agreement: I. Parents' gender and psychiatric symptoms. J Am Acad Child Adolesc Psychiatry 1988; 27:442-50. [PMID: 3182600 DOI: 10.1097/00004583-198807000-00012] [Citation(s) in RCA: 120] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Friedlander S, Weiss DS, Traylor J. Assessing the influence of maternal depression on the validity of the Child Behavior Checklist. J Abnorm Child Psychol 1986; 14:123-33. [PMID: 3950213 DOI: 10.1007/bf00917228] [Citation(s) in RCA: 75] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The relative effects of maternal depression, child gender, and child psychiatric status on mothers' ratings of their children were assessed in a study of the validity of the Child Behavior Checklist (CBCL). Both maternal depression and gender were found to be significantly associated with mothers' ratings of their children on the CBCL. Nevertheless, mothers' ratings continued to differentiate groups of children with and without psychiatric problems even after the variance accounted for by maternal depression and child gender was removed. These findings support the criterion validity of the CBCL, and point also to the importance of assessing parents as part of the clinical evaluation of children.
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Spector MH, Traylor J, Young EA, Weser E. Stimulation of mucosal growth by gastric and ileal infusion of single amino acids in parenterally nourished rats. Digestion 1981; 21:33-40. [PMID: 6785134 DOI: 10.1159/000198517] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The effect on the intestinal mucosa of continuously infusing single amino acids, glycine, valine and histidine into the stomach and ileum was compared with saline and an amino acid mixture (AA) in rats fed to parenteral nutrition. After gastric infusion, glycine did not differ from saline, valine increased mucosa in the proximal segments and histidine alone increased mucosa in the proximal bowel equal to AA. After ileal infusion, all amino acids increased mucosa in the ileum. Valine and histidine, but not glycine, increased mucosa in the remote proximal small bowel. Therefore, regional differences occur in mucosal growth response to single amino acids.
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