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Samani A, Karuppasamy M, English KG, Siler CA, Wang Y, Widrick JJ, Alexander MS. DOCK3 regulates normal skeletal muscle regeneration and glucose metabolism. FASEB J 2023; 37:e23198. [PMID: 37742307 PMCID: PMC10539028 DOI: 10.1096/fj.202300386rr] [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] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 08/29/2023] [Accepted: 09/05/2023] [Indexed: 09/26/2023]
Abstract
DOCK (dedicator of cytokinesis) is an 11-member family of typical guanine nucleotide exchange factors (GEFs) expressed in the brain, spinal cord, and skeletal muscle. Several DOCK proteins have been implicated in maintaining several myogenic processes such as fusion. We previously identified DOCK3 as being strongly upregulated in Duchenne muscular dystrophy (DMD), specifically in the skeletal muscles of DMD patients and dystrophic mice. Dock3 ubiquitous KO mice on the dystrophin-deficient background exacerbated skeletal muscle and cardiac phenotypes. We generated Dock3 conditional skeletal muscle knockout mice (Dock3 mKO) to characterize the role of DOCK3 protein exclusively in the adult muscle lineage. Dock3 mKO mice presented with significant hyperglycemia and increased fat mass, indicating a metabolic role in the maintenance of skeletal muscle health. Dock3 mKO mice had impaired muscle architecture, reduced locomotor activity, impaired myofiber regeneration, and metabolic dysfunction. We identified a novel DOCK3 interaction with SORBS1 through the C-terminal domain of DOCK3 that may account for its metabolic dysregulation. Together, these findings demonstrate an essential role for DOCK3 in skeletal muscle independent of DOCK3 function in neuronal lineages.
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Affiliation(s)
- Adrienne Samani
- Department of Pediatrics, Division of Neurology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
| | - Muthukumar Karuppasamy
- Department of Pediatrics, Division of Neurology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
| | - Katherine G. English
- Department of Pediatrics, Division of Neurology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
| | - Colin A. Siler
- Department of Pediatrics, Division of Neurology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
| | - Yimin Wang
- Department of Pediatrics, Division of Neurology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
| | - Jeffrey J. Widrick
- Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA 02115, USA; Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA
| | - Matthew S. Alexander
- Department of Pediatrics, Division of Neurology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
- UAB Center for Exercise Medicine at the University of Alabama at Birmingham, Birmingham, AL, 35294
- Department of Genetics at the University of Alabama at Birmingham, Birmingham, AL 35294
- UAB Civitan International Research Center (CIRC), at the University of Alabama at Birmingham, Birmingham, AL 35233
- UAB Center for Neurodegeneration and Experimental Therapeutics (CNET), Birmingham, AL 35294, USA
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Samani A, Bennett R, Eremeishvili K, Kalofonou F, Whear S, Montes A, Kristeleit R, Krell J, McNeish I, Ghosh S, Tookman L. Corrigendum to 'Glomerular filtration rate estimation for carboplatin dosing in patients with gynaecological cancers': [ESMO Open volume 7 (2022) 10.1016/j.esmoop.2022.100401]. ESMO Open 2023; 8:100640. [PMID: 37071958 PMCID: PMC10130064 DOI: 10.1016/j.esmoop.2022.100640] [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: 04/20/2023] Open
Affiliation(s)
- A Samani
- Department of Surgery and Cancer, Imperial College London, London; Department of Medical Oncology, Imperial College Healthcare NHS Trust, London
| | - R Bennett
- Department of Medical Oncology, Imperial College Healthcare NHS Trust, London
| | - K Eremeishvili
- Guy's Cancer Centre, Guy's and St. Thomas'NHS Foundation Trust, London, UK
| | - F Kalofonou
- Department of Medical Oncology, Imperial College Healthcare NHS Trust, London
| | - S Whear
- Department of Surgery and Cancer, Imperial College London, London
| | - A Montes
- Guy's Cancer Centre, Guy's and St. Thomas'NHS Foundation Trust, London, UK
| | - R Kristeleit
- Guy's Cancer Centre, Guy's and St. Thomas'NHS Foundation Trust, London, UK
| | - J Krell
- Department of Surgery and Cancer, Imperial College London, London; Department of Medical Oncology, Imperial College Healthcare NHS Trust, London
| | - I McNeish
- Department of Surgery and Cancer, Imperial College London, London; Department of Medical Oncology, Imperial College Healthcare NHS Trust, London
| | - S Ghosh
- Guy's Cancer Centre, Guy's and St. Thomas'NHS Foundation Trust, London, UK
| | - L Tookman
- Department of Surgery and Cancer, Imperial College London, London; Department of Medical Oncology, Imperial College Healthcare NHS Trust, London.
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Samani A, Karuppasamy M, English KG, Siler CA, Wang Y, Widrick JJ, Alexander MS. DOCK3 regulates normal skeletal muscle regeneration and glucose metabolism. bioRxiv 2023:2023.02.22.529576. [PMID: 36865261 PMCID: PMC9980075 DOI: 10.1101/2023.02.22.529576] [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] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
DOCK (dedicator of cytokinesis) is an 11-member family of typical guanine nucleotide exchange factors (GEFs) expressed in the brain, spinal cord, and skeletal muscle. Several DOCK proteins have been implicated in maintaining several myogenic processes such as fusion. We previously identified DOCK3 as being strongly upregulated in Duchenne muscular dystrophy (DMD), specifically in the skeletal muscles of DMD patients and dystrophic mice. Dock3 ubiquitous KO mice on the dystrophin-deficient background exacerbated skeletal muscle and cardiac phenotypes. We generated Dock3 conditional skeletal muscle knockout mice (Dock3 mKO) to characterize the role of DOCK3 protein exclusively in the adult muscle lineage. Dock3 mKO mice presented with significant hyperglycemia and increased fat mass, indicating a metabolic role in the maintenance of skeletal muscle health. Dock3 mKO mice had impaired muscle architecture, reduced locomotor activity, impaired myofiber regeneration, and metabolic dysfunction. We identified a novel DOCK3 interaction with SORBS1 through the C-terminal domain of DOCK3 that may account for its metabolic dysregulation. Together, these findings demonstrate an essential role for DOCK3 in skeletal muscle independent of DOCK3 function in neuronal lineages.
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Affiliation(s)
- Adrienne Samani
- Department of Pediatrics, Division of Neurology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
| | - Muthukumar Karuppasamy
- Department of Pediatrics, Division of Neurology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
| | - Katherine G. English
- Department of Pediatrics, Division of Neurology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
| | - Colin A. Siler
- Department of Pediatrics, Division of Neurology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
| | - Yimin Wang
- Department of Pediatrics, Division of Neurology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
| | - Jeffrey J. Widrick
- Division of Genetics and Genomics, Boston Children’s Hospital, Boston, MA 02115, USA; Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA
| | - Matthew S. Alexander
- Department of Pediatrics, Division of Neurology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
- UAB Center for Exercise Medicine at the University of Alabama at Birmingham, Birmingham, AL, 35294
- Department of Genetics at the University of Alabama at Birmingham, Birmingham, AL 35294
- UAB Civitan International Research Center (CIRC), at the University of Alabama at Birmingham, Birmingham, AL 35233
- UAB Center for Neurodegeneration and Experimental Therapeutics (CNET), Birmingham, AL 35294, USA
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English KG, Reid AL, Samani A, Coulis GJF, Villalta SA, Walker CJ, Tamir S, Alexander MS. Next-Generation SINE Compound KPT-8602 Ameliorates Dystrophic Pathology in Zebrafish and Mouse Models of DMD. Biomedicines 2022; 10:biomedicines10102400. [PMID: 36289662 PMCID: PMC9598711 DOI: 10.3390/biomedicines10102400] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2022] [Revised: 09/15/2022] [Accepted: 09/20/2022] [Indexed: 11/25/2022] Open
Abstract
Duchenne muscular dystrophy (DMD) is a progressive, X-linked childhood neuromuscular disorder that results from loss-of-function mutations in the DYSTROPHIN gene. DMD patients exhibit muscle necrosis, cardiomyopathy, respiratory failure, and loss of ambulation. One of the major driving forces of DMD disease pathology is chronic inflammation. The current DMD standard of care is corticosteroids; however, there are serious side effects with long-term use, thus identifying novel anti-inflammatory and anti-fibrotic treatments for DMD is of high priority. We investigated the next-generation SINE compound, KPT-8602 (eltanexor) as an oral therapeutic to alleviate dystrophic symptoms. We performed pre-clinical evaluation of the effects of KPT-8602 in DMD zebrafish (sapje) and mouse (D2-mdx) models. KPT-8602 improved dystrophic skeletal muscle pathologies, muscle architecture and integrity, and overall outcomes in both animal models. KPT-8602 treatment ameliorated DMD pathology in D2-mdx mice, with increased locomotor behavior and improved muscle histology. KPT-8602 altered the immunological profile of the dystrophic mice, and reduced circulating osteopontin serum levels. These findings demonstrate KPT-8602 as an effective therapeutic in DMD through by promotion of an anti-inflammatory environment and overall improvement of DMD pathological outcomes.
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Affiliation(s)
- Katherine G. English
- Department of Pediatrics, Division of Neurology at Children’s of Alabama the University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Andrea L. Reid
- Department of Pediatrics, Division of Neurology at Children’s of Alabama the University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Adrienne Samani
- Department of Pediatrics, Division of Neurology at Children’s of Alabama the University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Gerald J. F. Coulis
- Department of Physiology and Biophysics, University of California-Irvine, Irvine, CA 92697, USA
- Institute for Immunology, University of California-Irvine, Irvine, CA 92967, USA
| | - S. Armando Villalta
- Department of Physiology and Biophysics, University of California-Irvine, Irvine, CA 92697, USA
- Institute for Immunology, University of California-Irvine, Irvine, CA 92967, USA
| | | | | | - Matthew S. Alexander
- Department of Pediatrics, Division of Neurology at Children’s of Alabama the University of Alabama at Birmingham, Birmingham, AL 35233, USA
- UAB Center for Exercise Medicine (UCEM), Birmingham, AL 35205, USA
- Department of Genetics, University of Alabama at Birmingham, Birmingham, AL 35233, USA
- UAB Civitan International Research Center (CIRC), Birmingham, AL 35233, USA
- UAB Center for Neurodegeneration and Experimental Therapeutics (CNET), Birmingham, AL 35294, USA
- Correspondence:
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Samani A, Hightower RM, Reid AL, English KG, Lopez MA, Doyle JS, Conklin MJ, Schneider DA, Bamman MM, Widrick JJ, Crossman DK, Xie M, Jee D, Lai EC, Alexander MS. miR-486 is essential for muscle function and suppresses a dystrophic transcriptome. Life Sci Alliance 2022; 5:e202101215. [PMID: 35512829 PMCID: PMC9087951 DOI: 10.26508/lsa.202101215] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 04/19/2022] [Accepted: 04/20/2022] [Indexed: 02/02/2023] Open
Abstract
miR-486 is a muscle-enriched microRNA, or "myomiR," that has reduced expression correlated with Duchenne muscular dystrophy (DMD). To determine the function of miR-486 in normal and dystrophin-deficient muscles and elucidate miR-486 target transcripts in skeletal muscle, we characterized mir-486 knockout mice (mir-486 KO). mir-486 KO mice developed disrupted myofiber architecture, decreased myofiber size, decreased locomotor activity, increased cardiac fibrosis, and metabolic defects were exacerbated in mir-486 KO:mdx 5cv (DKO) mice. To identify direct in vivo miR-486 muscle target transcripts, we integrated RNA sequencing and chimeric miRNA eCLIP sequencing to identify key transcripts and pathways that contribute towards mir-486 KO and dystrophic disease pathologies. These targets included known and novel muscle metabolic and dystrophic structural remodeling factors of muscle and skeletal muscle contractile transcript targets. Together, our studies identify miR-486 as essential for normal muscle function, a driver of pathological remodeling in dystrophin-deficient muscle, a useful biomarker for dystrophic disease progression, and highlight the use of multiple omic platforms to identify in vivo microRNA target transcripts.
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Affiliation(s)
- Adrienne Samani
- Department of Pediatrics, Division of Neurology at Children's of Alabama and the University of Alabama at Birmingham, Birmingham, AL, USA
| | - Rylie M Hightower
- Department of Pediatrics, Division of Neurology at Children's of Alabama and the University of Alabama at Birmingham, Birmingham, AL, USA
- University of Alabama at Birmingham Center for Exercise Medicine (UCEM), Birmingham, AL, USA
| | - Andrea L Reid
- Department of Pediatrics, Division of Neurology at Children's of Alabama and the University of Alabama at Birmingham, Birmingham, AL, USA
| | - Katherine G English
- Department of Pediatrics, Division of Neurology at Children's of Alabama and the University of Alabama at Birmingham, Birmingham, AL, USA
| | - Michael A Lopez
- Department of Pediatrics, Division of Neurology at Children's of Alabama and the University of Alabama at Birmingham, Birmingham, AL, USA
- University of Alabama at Birmingham Center for Exercise Medicine (UCEM), Birmingham, AL, USA
| | - J Scott Doyle
- Department of Orthopedic Surgery, at the University of Alabama at Birmingham, Birmingham, AL, USA
| | - Michael J Conklin
- Department of Orthopedic Surgery, at the University of Alabama at Birmingham, Birmingham, AL, USA
| | - David A Schneider
- Department of Biochemistry and Molecular Genetics at the University of Alabama at Birmingham, Birmingham, AL, USA
| | - Marcas M Bamman
- University of Alabama at Birmingham Center for Exercise Medicine (UCEM), Birmingham, AL, USA
| | - Jeffrey J Widrick
- Division of Genetics and Genomics at Boston Children's Hospital, Boston, MA, USA
| | - David K Crossman
- Department of Genetics, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Min Xie
- Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, School of Medicine, Birmingham, AL, USA
| | - David Jee
- Developmental Biology Program, Sloan Kettering Institute, New York, NY, USA
- Weill Graduate School of Medical Sciences, Cornell University, New York, NY, USA
| | - Eric C Lai
- Developmental Biology Program, Sloan Kettering Institute, New York, NY, USA
- Weill Graduate School of Medical Sciences, Cornell University, New York, NY, USA
| | - Matthew S Alexander
- Department of Pediatrics, Division of Neurology at Children's of Alabama and the University of Alabama at Birmingham, Birmingham, AL, USA
- University of Alabama at Birmingham Center for Exercise Medicine (UCEM), Birmingham, AL, USA
- Department of Genetics, University of Alabama at Birmingham, Birmingham, AL, USA
- UAB Civitan International Research Center (CIRC), at the University of Alabama at Birmingham, Birmingham, AL, USA
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Samani A, English KG, Lopez MA, Birch CL, Brown DM, Kaur G, Worthey EA, Alexander MS. DOCKopathies: A systematic review of the clinical pathologies associated with human DOCK pathogenic variants. Hum Mutat 2022; 43:1149-1161. [PMID: 35544951 PMCID: PMC9357139 DOI: 10.1002/humu.24398] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 12/20/2021] [Revised: 04/29/2022] [Accepted: 05/06/2022] [Indexed: 11/06/2022]
Abstract
The Dedicator of Cytokinesis (DOCK) family (DOCK1-11) of genes are essential mediators of cellular migration, growth, and fusion in a variety of cell types and tissues. Recent advances in whole-genome sequencing of patients with undiagnosed genetic disorders have identified several rare pathogenic variants in DOCK genes. We conducted a systematic review and performed a patient database and literature search of reported DOCK pathogenic variants that have been identified in association with clinical pathologies such as global developmental delay, immune cell dysfunction, muscle hypotonia, and muscle ataxia among other categories. We then categorized these pathogenic DOCK variants and their associated clinical phenotypes under several unique categories: developmental, cardiovascular, metabolic, cognitive, or neuromuscular. Our systematic review of DOCK variants aims to identify and analyze potential DOCK-regulated networks associated with neuromuscular diseases and other disease pathologies, which may identify novel therapeutic strategies and targets. This systematic analysis and categorization of human-associated pathologies with DOCK pathogenic variants is the first report to the best of our knowledge for a unique class in this understudied gene family that has important implications in furthering personalized genomic medicine, clinical diagnoses, and improve targeted therapeutic outcomes across many clinical pathologies.
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Affiliation(s)
- Adrienne Samani
- Department of Pediatrics, Division of Neurology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
| | - Katherine G. English
- Department of Pediatrics, Division of Neurology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
| | - Michael A. Lopez
- Department of Pediatrics, Division of Neurology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
| | - Camille L. Birch
- Department of Pediatrics, Division of Pediatric Hematology and Oncology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
- Center for Computational Genomics and Data Science at Children’s of Alabama, Birmingham, AL 35294
| | - Donna M. Brown
- Department of Pediatrics, Division of Pediatric Hematology and Oncology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
- Center for Computational Genomics and Data Science at Children’s of Alabama, Birmingham, AL 35294
| | - Gurpreet Kaur
- Department of Pediatrics, Division of Pediatric Hematology and Oncology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
- Center for Computational Genomics and Data Science at Children’s of Alabama, Birmingham, AL 35294
| | - Elizabeth A. Worthey
- Department of Pediatrics, Division of Pediatric Hematology and Oncology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
- Center for Computational Genomics and Data Science at Children’s of Alabama, Birmingham, AL 35294
| | - Matthew S. Alexander
- Department of Pediatrics, Division of Neurology at the University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294
- UAB Center for Exercise Medicine at the University of Alabama at Birmingham, Birmingham, AL, 35294
- Department of Genetics at the University of Alabama at Birmingham, Birmingham, AL 35294
- UAB Civitan International Research Center (CIRC), at the University of Alabama at Birmingham, Birmingham, AL 35233
- UAB Center for Neurodegeneration and Experimental Therapeutics (CNET), Birmingham, AL 35294, USA
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Samani A, Bennett R, Eremeishvili K, Kalofonou F, Whear S, Montes A, Kristeleit R, Krell J, McNeish I, Ghosh S, Tookman L. Glomerular filtration rate estimation for carboplatin dosing in patients with gynaecological cancers. ESMO Open 2022; 7:100401. [PMID: 35227967 PMCID: PMC9058909 DOI: 10.1016/j.esmoop.2022.100401] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 12/31/2021] [Accepted: 01/19/2022] [Indexed: 11/21/2022] Open
Abstract
Background Carboplatin remains integral for treatment of gynaecological malignancies and dosing is based on glomerular filtration rate (GFR). Measurement via radiotracer decay [nuclear medicine GFR (nmGFR)] is ideal. However, this may be unavailable. Therefore GFR is often estimated using formulae that have not been validated in patients with cancer and/or specifically for gynaecological malignancies, leading to debate over optimal estimation. Suboptimal GFR estimation may affect efficacy or toxicity. Methods We surveyed several UK National Health Service Trusts to assess carboplatin dosing practise. We then explored single-centre accuracy, bias and precision of various formulae for GFR estimation, relative to nmGFR, before validating our findings in an external cohort. Results Across 18 Trusts, there was considerable heterogeneity in GFR estimation, including the formulae used [Cockcroft–Gault (CG) versus Wright], weight adjustment and area under the curve (AUC; 5 versus 6). We analysed 274 and 192 patients in two centres. Overall, CamGFR v2 (a novel formula for GFR estimation developed at Cambridge University Hospitals NHS Foundation Trust) excelled, showing the highest accuracy and precision. This translated into accuracy of hypothetical carboplatin dosing; nmGFR-derived carboplatin dose fell within 20% of the Cam GFR v2-derived dose in 86.5% and 87% of patients across the cohorts. Among the CG formula and its derivatives, using adjusted body weight in those with body mass index ≥25 kg/m2 [CG-adjusted body weight (CG-AdBW)] was optimal. The Wright and unadjusted CG estimators performed most poorly. Conclusions When compared with nmGFR assessment, accuracy, bias and precision varied widely between GFR estimators, with the newly developed Cam GFR v2 and CG-AdBW performing best. In general, weight (or body surface area)-adjusted formulae excelled, while the unadjusted CG and Wright formulae or the use of AUC6 (versus nmGFR AUC5) produced risk of significant overdose. Thus, individual centres should validate their GFR estimation methods. In the absence of validation, CG-AdBW or CamGFR v2 is likely to perform well while unadjusted CG/Wright formulae or AUC6 dosing should be avoided. Despite therapeutic advances, carboplatin is still used repeatedly for treatment of gynaecological cancers. Between centres, there is heterogenous use of GFR estimation methods for carboplatin dosing. The novel CamGFR v2 and CG-AdBW are the most accurate estimators. The Wright formula, unadjusted CG and the use of AUC6 with estimated GFR should all be avoided. If internal validation unavailable, centres should use CamGFR v2 or CG-AdBW for GFR estimation.
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Affiliation(s)
- A Samani
- Department of Surgery and Cancer, Imperial College London, London, UK; Department of Medical Oncology, Imperial College Healthcare NHS Trust, London, UK. https://twitter.com/amit_samani1
| | - R Bennett
- Department of Medical Oncology, Imperial College Healthcare NHS Trust, London, UK
| | - K Eremeishvili
- Guy's Cancer Centre, Guy's and St. Thomas' NHS Foundation Trust, London, UK
| | - F Kalofonou
- Department of Medical Oncology, Imperial College Healthcare NHS Trust, London, UK. https://twitter.com/FKalofonou
| | - S Whear
- Department of Surgery and Cancer, Imperial College London, London, UK
| | - A Montes
- Guy's Cancer Centre, Guy's and St. Thomas' NHS Foundation Trust, London, UK
| | - R Kristeleit
- Guy's Cancer Centre, Guy's and St. Thomas' NHS Foundation Trust, London, UK
| | - J Krell
- Department of Surgery and Cancer, Imperial College London, London, UK; Department of Medical Oncology, Imperial College Healthcare NHS Trust, London, UK
| | - I McNeish
- Department of Surgery and Cancer, Imperial College London, London, UK; Department of Medical Oncology, Imperial College Healthcare NHS Trust, London, UK
| | - S Ghosh
- Guy's Cancer Centre, Guy's and St. Thomas' NHS Foundation Trust, London, UK. https://twitter.com/sharmisthaghosh
| | - L Tookman
- Department of Surgery and Cancer, Imperial College London, London, UK; Department of Medical Oncology, Imperial College Healthcare NHS Trust, London, UK.
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Reid AL, Wang Y, Samani A, Hightower RM, Lopez MA, Gilbert SR, Ianov L, Crossman DK, Dell’Italia LJ, Millay DP, van Groen T, Halade GV, Alexander MS. DOCK3 is a dosage-sensitive regulator of skeletal muscle and Duchenne muscular dystrophy-associated pathologies. Hum Mol Genet 2020; 29:2855-2871. [PMID: 32766788 PMCID: PMC7566544 DOI: 10.1093/hmg/ddaa173] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 07/07/2020] [Accepted: 07/29/2020] [Indexed: 12/26/2022] Open
Abstract
DOCK3 is a member of the DOCK family of guanine nucleotide exchange factors that regulate cell migration, fusion and viability. Previously, we identified a dysregulated miR-486/DOCK3 signaling cascade in dystrophin-deficient muscle, which resulted in the overexpression of DOCK3; however, little is known about the role of DOCK3 in muscle. Here, we characterize the functional role of DOCK3 in normal and dystrophic skeletal muscle. Utilizing Dock3 global knockout (Dock3 KO) mice, we found that the haploinsufficiency of Dock3 in Duchenne muscular dystrophy mice improved dystrophic muscle pathologies; however, complete loss of Dock3 worsened muscle function. Adult Dock3 KO mice have impaired muscle function and Dock3 KO myoblasts are defective for myogenic differentiation. Transcriptomic analyses of Dock3 KO muscles reveal a decrease in myogenic factors and pathways involved in muscle differentiation. These studies identify DOCK3 as a novel modulator of muscle health and may yield therapeutic targets for treating dystrophic muscle symptoms.
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Affiliation(s)
- Andrea L Reid
- Division of Neurology, Department of Pediatrics, The University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294, USA
| | - Yimin Wang
- Division of Neurology, Department of Pediatrics, The University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294, USA
| | - Adrienne Samani
- Division of Neurology, Department of Pediatrics, The University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294, USA
| | - Rylie M Hightower
- Division of Neurology, Department of Pediatrics, The University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294, USA
- UAB Center for Exercise Medicine, Birmingham, AL 35294, USA
| | - Michael A Lopez
- Division of Neurology, Department of Pediatrics, The University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294, USA
- UAB Center for Exercise Medicine, Birmingham, AL 35294, USA
| | - Shawn R Gilbert
- Department of Orthopedic Surgery, The University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Lara Ianov
- Civitan International Research Center, The University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - David K Crossman
- Department of Genetics, The University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Louis J Dell’Italia
- Birmingham Veteran Affairs Medical Center, Birmingham, AL 35233, USA
- Division of Cardiovascular Disease, Department of Medicine, The University of Alabama at Birmingham, Birmingham, AL 35294, USA
- Department of Cell, Developmental, and Integrative Biology, The University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Douglas P Millay
- Division of Molecular Cardiovascular Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229, USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
| | - Thomas van Groen
- Department of Cell, Developmental, and Integrative Biology, The University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Ganesh V Halade
- Division of Cardiovascular Sciences, Department of Medicine, University of South Florida, Tampa, FL 33602, USA
| | - Matthew S Alexander
- Division of Neurology, Department of Pediatrics, The University of Alabama at Birmingham and Children’s of Alabama, Birmingham, AL 35294, USA
- UAB Center for Exercise Medicine, Birmingham, AL 35294, USA
- Civitan International Research Center, The University of Alabama at Birmingham, Birmingham, AL 35294, USA
- Department of Genetics, The University of Alabama at Birmingham, Birmingham, AL 35294, USA
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Arneson-Wissink PC, Hogan KA, Ducharme AM, Samani A, Jatoi A, Doles JD. The wasting-associated metabolite succinate disrupts myogenesis and impairs skeletal muscle regeneration. JCSM Rapid Commun 2020; 3:56-69. [PMID: 32905522 PMCID: PMC7470228 DOI: 10.1002/rco2.14] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
BACKGROUND Muscle wasting is a debilitating co-morbidity affecting most advanced cancer patients. Alongside enhanced muscle catabolism, defects in muscle repair/regeneration contribute to cancer-associated wasting. Among the factors implicated in suppression of muscle regeneration are cytokines that interfere with myogenic signal transduction pathways. Less understood is how other cancer/wasting-associated cues, such as metabolites, contribute to muscle dysfunction. This study investigates how the metabolite succinate affects myogenesis and muscle regeneration. METHODS We leveraged an established ectopic metabolite treatment (cell permeable dimethyl-succinate) strategy to evaluate the ability of intracellular succinate elevation to 1) affect myoblast homeostasis (proliferation, apoptosis), 2) disrupt protein dynamics and induce wasting-associated atrophy, and 3) modulate in vitro myogenesis. In vivo succinate supplementation experiments (2% succinate, 1% sucrose vehicle) were used to corroborate and extend in vitro observations. Metabolic profiling and functional metabolic studies were then performed to investigate the impact of succinate elevation on mitochondria function. RESULTS We found that in vitro succinate supplementation elevated intracellular succinate about 2-fold, and did not have an impact on proliferation or apoptosis of C2C12 myoblasts. Elevated succinate had minor effects on protein homeostasis (~25% decrease in protein synthesis assessed by OPP staining), and no significant effect on myotube atrophy. Succinate elevation interfered with in vitro myoblast differentiation, characterized by significant decreases in late markers of myogenesis and fewer nuclei per myosin heavy chain positive structure (assessed by immunofluorescence staining). While mice orally administered succinate did not exhibit changes in overall body composition or whole muscle weights, these mice displayed smaller muscle myofiber diameters (~6% decrease in the mean of non-linear regression curves fit to the histograms of minimum feret diameter distribution), which was exacerbated when muscle regeneration was induced with barium chloride injury. Significant decreases in the mean of non-linear regression curves fit to the histograms of minimum feret diameter distributions were observed 7 days and 28 days post injury. Elevated numbers of myogenin positive cells (3-fold increase) supportive of the differentiation defects observed in vitro were observed 28 days post injury. Metabolic profiling and functional metabolic assessment of myoblasts revealed that succinate elevation caused both widespread metabolic changes and significantly lowered maximal cellular respiration (~35% decrease). CONCLUSIONS This study broadens the repertoire of wasting-associated factors that can directly modulate muscle progenitor cell function and strengthens the hypothesis that metabolic derangements are significant contributors to impaired muscle regeneration, an important aspect of cancer-associated muscle wasting.
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Affiliation(s)
- Paige C Arneson-Wissink
- Department of Biochemistry and Molecular Biology, Mayo
Clinic, Rochester, Minnesota, 55905 USA
| | - Kelly A Hogan
- Department of Biochemistry and Molecular Biology, Mayo
Clinic, Rochester, Minnesota, 55905 USA
| | - Alexandra M Ducharme
- Department of Biochemistry and Molecular Biology, Mayo
Clinic, Rochester, Minnesota, 55905 USA
| | - Adrienne Samani
- Department of Biochemistry and Molecular Biology, Mayo
Clinic, Rochester, Minnesota, 55905 USA
| | - Aminah Jatoi
- Department of Oncology, Mayo Clinic, Rochester,
Minnesota
| | - Jason D Doles
- Department of Biochemistry and Molecular Biology, Mayo
Clinic, Rochester, Minnesota, 55905 USA
- Corresponding Author: Jason D Doles, Department of
Biochemistry and Molecular Biology, Mayo Clinic, 200 First St SW, Guggenheim
16-11A1, Rochester, MN 55905, Tel: (507) 284-9372, Fax: (507) 284-3383,
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Saber MG, Osman M, Patel D, Samani A, El-Fiky E, Alam MS, Shahriar KA, Xing Z, Jacques M, Dortschy B, Vall-Llosera G, Urban PJ, Cavaliere F, Lessard S, Plant DV. Demonstration of a 120° hybrid based simplified coherent receiver on SOI for high speed PON applications. Opt Express 2018; 26:31222-31232. [PMID: 30650711 DOI: 10.1364/oe.26.031222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Accepted: 10/31/2018] [Indexed: 06/09/2023]
Abstract
We demonstrate the first simplified coherent receiver using a 120° hybrid on silicon-on-insulator (SOI) for high speed PON applications. This coherent receiver integrates an inverse taper edge coupler for the received signal, a vertical grating coupler for the local oscillator input, a polarization splitter and rotator (PSR), a 120° hybrid based on a 3×3 multimode interference (MMI) coupler, and three germanium photodetectors. We achieved 25 Gbit/s two-level pulse amplitude modulation (PAM-2) transmission over 30 km standard single mode fiber (SMF) in the C-band without any digital signal processing (DSP) (e.g., pre-emphasis, pulse shaping, equalization, nonlinearity compensation) and dispersion compensation (e.g., optical or digital) either at the transmitter or at the receiver. The requirements for frequency and phase locking of the local oscillator (LO) were avoided due to the use of intensity modulated signals. Receiver sensitivities of -23.70 dBm, -20.30 dBm, and -15.10 dBm are achieved at a bit error rate (BER) below the hard-decision forward error correction (HD-FEC) threshold (i.e., 3.8 × 10-3) in back-to-back (B2B), after 21 km and 30 km, respectively. We also demonstrate 25 Gbit/s PAM-4 transmission achieving receiver sensitivities of -15.30 dBm, -13.90 dBm, and -9.50 dBm below the HD-FEC threshold in B2B, after 10.5 km and 21 km, respectively.
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11
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Madeleine P, Hansen EA, Andersen RE, Kumorek M, Mroczek D, Samani A, Kawczyński A. Eccentric exercise induces spatial changes in the mechanomyographic activity of the upper trapezius muscle. Scand J Med Sci Sports 2018; 28:1661-1670. [PMID: 29394519 DOI: 10.1111/sms.13067] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/26/2018] [Indexed: 11/28/2022]
Abstract
In this study, we hypothesized that the recordings of multichannel mechanomyography (MMG) of the upper trapezius muscle would reveal spatially dependent manifestations in the presence of delayed onset muscle soreness occurring 24 hours after eccentric exercise (ECC). Sixteen participants performed high-intensity eccentric exercises (5 sets of 10 eccentric contractions at 100% of max elevation force) targeting the upper trapezius on their dominant side. Twelve accelerometers were attached to record MMG activity during submaximal exercise consisting of static and dynamic arm flexion and abduction. Measurements were taken before and 24 hours after ECC. Average rectified value (ARV), percentage of determinism (% DET), and recurrence (% REC) of the MMG signals were computed to estimate the level of muscular activity and the magnitude of regularity of the MMG. The ARV, % REC, and % DET maps revealed heterogeneous MMG activity of the upper trapezius 24 hours after ECC when compared with before. Increased ARV, % REC, and % DET were found 24 hours after ECC when compared with before. The study provides new key information on how a single muscle responds to ECC. Our findings suggest that multichannel MMG and nonlinear analyses may detect muscular and musculo-tendinous alterations due to ECC.
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Affiliation(s)
- P Madeleine
- Department of Health Science and Technology, Sport Sciences, Aalborg University, Aalborg, Denmark
| | - E A Hansen
- Department of Health Science and Technology, Sport Sciences, Aalborg University, Aalborg, Denmark
| | - R E Andersen
- Department of Health Science and Technology, Sport Sciences, Aalborg University, Aalborg, Denmark
| | - M Kumorek
- Department of Paralympics Sports, University School of Physical Education, Wrocław, Poland
| | - D Mroczek
- Department of Athletes Motor Skills, University School of Physical Education, Wrocław, Poland
| | - A Samani
- Department of Health Science and Technology, Sport Sciences, Aalborg University, Aalborg, Denmark
| | - A Kawczyński
- Department of Paralympics Sports, University School of Physical Education, Wrocław, Poland
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Hogan KA, Cho DS, Arneson PC, Samani A, Palines P, Yang Y, Doles JD. Tumor-derived cytokines impair myogenesis and alter the skeletal muscle immune microenvironment. Cytokine 2017; 107:9-17. [PMID: 29153940 DOI: 10.1016/j.cyto.2017.11.006] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Revised: 10/26/2017] [Accepted: 11/09/2017] [Indexed: 12/31/2022]
Abstract
Muscle wasting is a decline in skeletal muscle mass and function that is associated with aging, obesity, and a spectrum of pathologies including cancer. Cancer-associated wasting not only reduces quality of life, but also directly impacts cancer mortality, chemotherapeutic efficacy, and surgical outcomes. There is an incomplete understanding of the role of tumor-derived factors in muscle wasting and sparse knowledge of how these factors impact in vivo muscle regeneration. Here, we identify several cytokines/chemokines that negatively impact in vitro myogenic differentiation. We show that one of these cytokines, CXCL1, potently antagonizes in vivo muscle regeneration and interferes with in vivo muscle satellite cell homeostasis. Strikingly, CXCL1 triggers a robust and specific neutrophil/M2 macrophage response that likely underlies or exacerbates muscle repair/regeneration defects. Taken together, these data highlight the pleiotropic nature of a novel tumor-derived cytokine and underscore the importance of cytokines in muscle progenitor cell regulation.
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Affiliation(s)
- Kelly A Hogan
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55905, USA
| | - Dong Seong Cho
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55905, USA
| | - Paige C Arneson
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55905, USA
| | - Adrienne Samani
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55905, USA
| | - Patrick Palines
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55905, USA
| | - Yanan Yang
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55905, USA; Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, MN 55905, USA
| | - Jason D Doles
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55905, USA.
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13
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Suda EY, Madeleine P, Hirata RP, Samani A, Kawamura TT, Sacco ICN. Reduced complexity of force and muscle activity during low level isometric contractions of the ankle in diabetic individuals. Clin Biomech (Bristol, Avon) 2017; 42:38-46. [PMID: 28088014 DOI: 10.1016/j.clinbiomech.2017.01.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 12/19/2016] [Accepted: 01/03/2017] [Indexed: 02/07/2023]
Abstract
BACKGROUND This study evaluated the structure and amount of variability of surface electromyography (sEMG) patterns and ankle force data during low-level isometric contractions in diabetic subjects with different degrees of neuropathy. METHODS We assessed 10 control subjects and 38 diabetic patients, classified as absent, mild, moderate, or severe neuropathy, by a fuzzy system based on clinical variables. Multichannel sEMG (64-electrode matrix) of tibialis anterior and gastrocnemius medialis muscles were acquired during isometric contractions at 10%, 20%, and 30% of the maximum voluntary contraction, and force levels during dorsi- and plantarflexion were recorded. Standard deviation and sample entropy of force signals were calculated and root mean square and sample entropy were calculated from sEMG signals. Differences among groups of force and sEMG variables were verified using a multivariate analysis of variance. FINDINGS Overall, during dorsiflexion contractions, moderate and severe subjects had higher force standard deviation and moderate subjects had lower force sample entropy. During plantarflexion, moderate subjects had higher force standard deviation and all diabetic subjects had lower entropy. Tibialis anterior presented higher root mean square in absent group and lower entropy in mild subjects. For gastrocnemius medialis, entropy was higher in severe and lower in moderate subjects. INTERPRETATION Diabetic neuropathy affects the complexity of the neuromuscular system during low-level isometric contractions, reducing the system's capacity to adapt to challenging mechanical demands. The observed patterns of neuromuscular complexity were not associated with disease severity, with the majority of alterations recorded in moderate subject.
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Affiliation(s)
- E Y Suda
- Laboratory of Biomechanics of Human Movement, Dept. Physical Therapy, Speech and Occupational Therapy, School of Medicine, University of Sao Paulo, Sao Paulo, Brazil
| | - P Madeleine
- SMI, Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Denmark
| | - R P Hirata
- SMI, Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Denmark
| | - A Samani
- SMI, Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Denmark
| | - T T Kawamura
- Laboratory of Biomechanics of Human Movement, Dept. Physical Therapy, Speech and Occupational Therapy, School of Medicine, University of Sao Paulo, Sao Paulo, Brazil
| | - I C N Sacco
- Laboratory of Biomechanics of Human Movement, Dept. Physical Therapy, Speech and Occupational Therapy, School of Medicine, University of Sao Paulo, Sao Paulo, Brazil.
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14
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Samani A, Neville I, Merchant S, Bower M, Pria AD, Smith K, Ingram E, Newsom-Davis T. 109: Characteristics of HIV-associated lung cancer. Lung Cancer 2017. [DOI: 10.1016/s0169-5002(17)30159-9] [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: 10/20/2022]
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16
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Villumsen M, Madeleine P, Jørgensen M, Holtermann A, Samani A. Gender differences in variability patterns of forward bending: a cross-sectional field study among blue-collar workers in Denmark. Physiotherapy 2016. [DOI: 10.1016/j.physio.2016.10.386] [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: 11/16/2022]
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17
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Chiu M, Miles D, Samani A, Swinton M, Makris A. NICE Chemotherapy Guidelines in Advanced Breast Cancer (ABC) in Practice: Experience of Mount Vernon Cancer Centre. Clin Oncol (R Coll Radiol) 2015. [DOI: 10.1016/j.clon.2015.01.017] [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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18
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Samani A, Dhar S, Kh A, Win T. 115: Exploring the incidence of venous thromboembolism amongst thoracic oncology outpatients; time for thromboprophylaxis? Lung Cancer 2015. [DOI: 10.1016/s0169-5002(15)50109-8] [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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19
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Kawczyński A, Mroczek D, Frąckiewicz A, Chmura P, Becella L, Samani A, Madeleine P, Chmura J. Effects of two recovery procedures after a football game on sensory and biochemical markers. J Sports Med Phys Fitness 2014; 54:394-402. [PMID: 24518300] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
AIM The aim of this study was to investigate recovery processes on pressure pain sensitivity and blood indicators in professional football players after three different post-game training modalities: standard recovery training, no physical activity, delayed onset muscle soreness reduction training. METHODS Eleven male football field players participated in the present study. The experiment was performed in three sessions over three weeks after three football league games. The procedure was composed of the following assessments included in each session: measurement of pain pressure threshold, creatine kinase activity and myoglobin (Mb) concentration before, 24 and 48 hours after game. RESULTS In standard recovery training there was no full recovery in deep structure sensitivity of the frontal thigh muscles at 48 hours after game (P=0.008). In the no physical activity session, sensitivity returned to its level before game. On the contrary, in the delayed onset muscle soreness reduction training sensitivity decreased 48 hours after game (P<0.001). Creatine kinase activity decreased significantly from 24 hours to 48 hours in session with no activity and delayed onset muscle soreness reduction training (P<0.05). None of the recovery methods had an influence on Mb concentration. CONCLUSION The present study points towards a potent effect of delayed onset muscle soreness reduction training on recovery after a football game.
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Affiliation(s)
- A Kawczyński
- Department of Athletes Motor Skills, University School of Physical Education, Wrocław, Poland -
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20
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Kristiansen M, Madeleine P, Hansen EA, Samani A. Inter-subject variability of muscle synergies during bench press in power lifters and untrained individuals. Scand J Med Sci Sports 2013; 25:89-97. [PMID: 24372591 DOI: 10.1111/sms.12167] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/22/2013] [Indexed: 11/28/2022]
Abstract
The purpose of the study was to elucidate the role of expertise on muscle synergies involved in bench press. Ten expert power lifters (EXP) and nine untrained participants (UNT) completed three sets of eight repetitions at 60% of three repetition maximum in bench press. Muscle synergies were extracted from surface electromyography data of 21 bench press cycles using non-negative matrix factorization algorithm. The synergy activation coefficient represents the relative contribution of the muscle synergy to the overall muscle activity pattern, while the muscle synergy vector represents the relative weighting of each muscle within each synergy. Describing more than 90% of the variability, two muscle synergies reflected the eccentric and concentric phase. The cross-correlations (ρ(max)) for synergy activation coefficient 2 (concentric phase) were 0.83 [0.71;0.88] and 0.59 [0.49;0.77] [Median ρ(max) (25th;75th percentile)] (P = 0.001) in UNT and EXP, respectively. Median correlation coefficient (ρ) for muscle synergy vector 2 was 0.15 [-0.08;0.46] and 0.48 [0.02;0.70] (P = 0.03) in UNT and EXP, respectively. Thus, EXP showed larger inter-subject variability than UNT in the synergy activation coefficient during the concentric phase, while the muscle synergy vectors were less variable in EXP. This points at the importance of a specialized neural strategy in elite bench press performance.
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Affiliation(s)
- M. Kristiansen
- Center for Sensory-Motor Interaction (SMI); Department of Health Science and Technology; Aalborg University; Aalborg Denmark
| | - P. Madeleine
- Center for Sensory-Motor Interaction (SMI); Department of Health Science and Technology; Aalborg University; Aalborg Denmark
| | - E. A. Hansen
- Center for Sensory-Motor Interaction (SMI); Department of Health Science and Technology; Aalborg University; Aalborg Denmark
| | - A. Samani
- Center for Sensory-Motor Interaction (SMI); Department of Health Science and Technology; Aalborg University; Aalborg Denmark
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McGhee DJM, Royle PL, Counsell CE, Abbas A, Sethi P, Manku L, Narayan A, Clegg K, Bardai A, Brown SHM, Hafeez U, Abdelhafiz AH, McGovern A, Breckenridge A, Seenan P, Samani A, Das S, Khan S, Puffett AJ, Morgan J, Ross G, Cantlay A, Khan N, Bhalla A, Sweeting M, Nimmo CAMD, Fleet J, Igbedioh C, Harari D, Downey CL, Handforth C, Stothard C, Cracknell A, Barnes C, Shaw L, Bainbridge L, Crabtree L, Clark T, Root S, Aitken E, Haroon K, Sudlow M, Hanley K, Welsh S, Hill E, Falconer A, Miller H, Martin B, Tidy E, Pendlebury S, Thompson S, Burnett E, Taylor H, Lonan J, Adler B, McCallion J, Sykes E, Bancroft R, Tullo ES, Young TJ, Clift E, Flavin B, Roberts HC, Sayer AA, Belludi G, Aithal S, Verma A, Singh I, Barne M, Wilkinson I, Sakoane R, Singh N, Wilkinson I, Cottee M, Irani TS, Martinovic O, Abdulla AJJ, Irani TS, Abdulla AJJ, Riglin J, Husk J, Lowe D, Treml J, Vasilakis JN, Buttery A, Reid J, Healy P, Grant-Casey J, Pendry K, Richards J, Singh A, Jarrett D, Hewitt J, Slevin J, Barwell G, Youde J, Kennedy C, Romero-Ortuno R, O'Shea D, Robinson D, O'Shea D, Kenny RA, O'Connell J, Kennedy C, Romero-Ortuno R, O'Shea D, Robinson D, O'Shea D, Robinson D, O'Connell J, Topp JD, Topp JD, Warburton K, Simpson L, Bryce K, Suntharalingam S, Grosser K, D'Silva A, Southern L, Bielawski C, Cook L, Sutton GM, Flanagan L, Storr A, Charlton L, Kerr S, Robinson L, Shaw F, Finch LK, Weerasuriya N, Walker M, Sahota O, Logan P, Brown F, Rossiter F, Baxter M, Mucci E, Brown A, Jackson SHD, de Savary N, Hasan S, Jones H, Birrell J, Hockley J, Hensey N, Meiring R, Athavale N, Simms J, Brown S, West A, Diem P, Simms J, Brown S, West A, Diem P, Davies R, Kings R, Coleman H, Stevens D, Campbell C, Hope S, Morris A, Ong T, Harwood R, Dasgupta D, Mitchell S, Dimmock V, Collin F, Wood E, Green V, Hendrickse-Welsh N, Singh N, Cracknell A, Eccles J, Beezer J, Garside M, Baxter J. Clinical effectiveness. Age Ageing 2013. [DOI: 10.1093/ageing/aft016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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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Samani A, Kawczyński A, Chmura J, Madeleine P. Principle component analysis of exposure variation analysis during computer work at presence of delayed onset muscle soreness. ACTA ACUST UNITED AC 2012; 41 Suppl 1:2387-91. [DOI: 10.3233/wor-2012-0471-2387] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- A. Samani
- Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
| | - A. Kawczyński
- Depatment of Athletes Motor Skills, Sport Institute, University School of Physical Education, Wroclaw, Poland
| | - J. Chmura
- Depatment of Athletes Motor Skills, Sport Institute, University School of Physical Education, Wroclaw, Poland
| | - P. Madeleine
- Depatment of Athletes Motor Skills, Sport Institute, University School of Physical Education, Wroclaw, Poland
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Madeleine P, Samani A, Binderup AT, Stensdotter AK. Changes in the spatio-temporal organization of the trapezius muscle activity in response to eccentric contractions. Scand J Med Sci Sports 2011; 21:277-86. [PMID: 19903315 DOI: 10.1111/j.1600-0838.2009.01037.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
We hypothesized changes in the spatial organization of the trapezius muscle electromyographic (EMG) activity after a shoulder eccentric exercise. The rate of perceived exertion (RPE), the size of the soreness area, maximum force and, EMG from the upper, middle and lower trapezius were recorded. Root mean square (RMS), mean frequency (MNF) and normalized mutual information (a measure of functional connectivity between muscle sub-divisions) were computed during submaximal dynamic and static contractions performed before, immediately after and 24 h after exercise. Immediately after exercise, RPE, soreness area, RMS from the upper and middle trapezius and normalized mutual information among upper-middle sub-divisions increased while MNF decreased for the middle trapezius (P<0.05). After 24 h, the maximum force decreased. RMS from the upper trapezius and normalized mutual information among upper-middle trapezius sub-divisions were higher than before exercise. MNF values increased from immediately after to 24 h after for the upper and lower trapezius (P<0.05). The current results underlined changes in the spatio-temporal organization of the trapezius in response to shoulder eccentric exercise. The observed changes in EMG temporal and spectral contents and the enhanced sub-division coupling underlined the functional role of spatial variations of the EMG activity during muscle fatigue and in the presence of delayed-onset muscle soreness.
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Affiliation(s)
- P Madeleine
- Laboratory for Ergonomics and Work-Related Disorders, Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark.
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Rathleff M, Samani A, Olesen C, Kersting U, Madeleine P. Inverse relationship between the complexity of midfoot kinematics and muscle activation in patients with medial tibial stress syndrome. J Electromyogr Kinesiol 2011; 21:638-44. [DOI: 10.1016/j.jelekin.2011.03.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2010] [Revised: 03/04/2011] [Accepted: 03/04/2011] [Indexed: 10/18/2022] Open
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Kaster T, Sack I, Samani A. Measurement of the hyperelastic properties of ex vivo brain tissue slices. J Biomech 2011; 44:1158-63. [DOI: 10.1016/j.jbiomech.2011.01.019] [Citation(s) in RCA: 149] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2010] [Revised: 11/21/2010] [Accepted: 01/18/2011] [Indexed: 12/22/2022]
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Kim CY, Tate M, Chang E, Polley MY, Berger M, Mercier L, Del Maestro RF, Petrecca K, Collins DL, Doglietto F, Salehi F, Ridout R, Gentili F, Zadeh G, Shrivastava RK, Ghesani M, Sen C, Shrivastava RK, Tabaee A, Lee KD, DePowell JJ, Air E, Dwivedi AK, McPherson CM, Mishra MV, Andrews D, Evans J, Glass J, Dicker AP, Lawrence YR, Kirsch M, Juratli T, Meyer K, Schackert G, Cho JM, Kim EH, Oh MC, Chang JH, Kim SH, Lee KS, Cho JM, Kim EH, Oh MC, Chang JH, Kim SH, Lee KS, Adams H, Avendano J, Raza SM, Olivi A, Quinones-Hinojosa A, Del Maestro RF, Siu V, Seyed sadr M, Alshami J, Sabau C, Seyed sadr E, Anan M, Guiot MC, Samani A, Del Maestro P, Galameau A, Greaves K, Pouliot JF, Mangano F, Pruitt D, Hummel T. Surgical Therapies. Neuro Oncol 2010. [DOI: 10.1093/neuonc/noq116.s19] [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: 11/14/2022] Open
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Clarke JL, Ennis MM, Lamborn KR, Prados MD, Puduvalli VK, Penas-Prado M, Gilbert MR, Groves MD, Hess KR, Levin VA, de Groot J, Colman H, Conrad CA, Loghin ME, Hunter K, Yung WK, Chen C, Damek D, Liu A, Gaspar LE, Waziri A, Lillehei K, Kavanagh B, Finlay JL, Haley K, Dhall G, Gardner S, Allen J, Cornelius A, Olshefski R, Garvin J, Pradhan K, Etzl M, Goldman S, Atlas M, Thompson S, Hirt A, Hukin J, Comito M, Bertolone S, Torkildson J, Joyce M, Moertel C, Letterio J, Kennedy G, Walter A, Ji L, Sposto R, Dorris K, Wagner L, Hummel T, Drissi R, Miles L, Leach J, Chow L, Turner R, Gragert MN, Pruitt D, Sutton M, Breneman J, Crone K, Fouladi M, Friday BB, Buckner J, Anderson SK, Giannini C, Kugler J, Mazurczac M, Flynn P, Gross H, Pajon E, Jaeckle K, Galanis E, Badruddoja MA, Pazzi MA, Stea B, Lefferts P, Contreras N, Bishop M, Seeger J, Carmody R, Rance N, Marsella M, Schroeder K, Sanan A, Swinnen LJ, Rankin C, Rushing EJ, Hutchins LF, Damek DM, Barger GR, Norden AD, Lesser G, Hammond SN, Drappatz J, Fadul CE, Batchelor TT, Quant EC, Beroukhim R, Ciampa A, Doherty L, LaFrankie D, Ruland S, Bochacki C, Phan P, Faroh E, McNamara B, David K, Rosenfeld MR, Wen PY, Hammond SN, Norden AD, Drappatz J, Phuphanich S, Reardon D, Wong ET, Plotkin SR, Lesser G, Mintz A, Raizer JJ, Batchelor TT, Quant EC, Beroukhim R, Kaley TJ, Ciampa A, Doherty L, LaFrankie D, Ruland S, Smith KH, Wen PY, Chamberlain MC, Graham C, Mrugala M, Johnston S, Kreisl TN, Smith P, Iwamoto F, Sul J, Butman JA, Fine HA, Westphal M, Heese O, Warmuth-Metz M, Pietsch T, Schlegel U, Tonn JC, Schramm J, Schackert G, Melms A, Mehdorn HM, Seifert V, Geletneky K, Reuter D, Bach F, Khasraw M, Abrey LE, Lassman AB, Hormigo A, Nolan C, Gavrilovic IT, Mellinghoff IK, Reiner AS, DeAngelis L, Omuro AM, Burzynski SR, Weaver RA, Janicki TJ, Burzynski GS, Szymkowski B, Acelar SS, Mechtler LL, O'Connor PC, Kroon HA, Vora T, Kurkure P, Arora B, Gupta T, Dhamankar V, Banavali S, Moiyadi A, Epari S, Merchant N, Jalali R, Moller S, Grunnet K, Hansen S, Schultz H, Holmberg M, Sorensen MM, Poulsen HS, Lassen U, Reardon DA, Vredenburgh JJ, Desjardins A, Janney DE, Peters K, Sampson J, Gururangan S, Friedman HS, Jeyapalan S, Constantinou M, Evans D, Elinzano H, O'Connor B, Puthawala MY, Goldman M, Oyelese A, Cielo D, Dipetrillo T, Safran H, Anan M, Seyed Sadr M, Alshami J, Sabau C, Seyed Sadr E, Siu V, Guiot MC, Samani A, Del Maestro R, Bogdahn U, Stockhammer G, Mahapatra AK, Venkataramana NK, Oliushine VE, Parfenov VE, Poverennova IE, Hau P, Jachimczak P, Heinrichs H, Schlingensiepen KH, Shibui S, Kayama T, Wakabayashi T, Nishikawa R, de Groot M, Aronica E, Vecht CJ, Toering ST, Heimans JJ, Reijneveld JC, Batchelor T, Mulholland P, Neyns B, Nabors LB, Campone M, Wick A, Mason W, Mikkelsen T, Phuphanich S, Ashby LS, DeGroot JF, Gattamaneni HR, Cher LM, Rosenthal MA, Payer F, Xu J, Liu Q, van den Bent M, Nabors B, Fink K, Mikkelsen T, Chan M, Trusheim J, Raval S, Hicking C, Henslee-Downey J, Picard M, Reardon D, Kaley TJ, Wen PY, Schiff D, Karimi S, DeAngelis LM, Nolan CP, Omuro A, Gavrilovic I, Norden A, Drappatz J, Purow BW, Lieberman FS, Hariharan S, Abrey LE, Lassman AB, Perez-Larraya JG, Honnorat J, Chinot O, Catry-Thomas I, Taillandier L, Guillamo JS, Campello C, Monjour A, Tanguy ML, Delattre JY, Franz DN, Krueger DA, Care MM, Holland-Bouley K, Agricola K, Tudor C, Mangeshkar P, Byars AW, Sahmoud T, Alonso-Basanta M, Lustig RA, Dorsey JF, Lai RK, Recht LD, Reardon DA, Paleologos N, Groves M, Rosenfeld MR, Meech S, Davis T, Pavlov D, Marshall MA, Sampson J, Slot M, Peerdeman SM, Beauchesne PD, Faure G, Noel G, Schmitt T, Kerr C, Jadaud E, Martin L, Taillandier L, Carnin C, Desjardins A, Reardon DA, Peters KB, Herndon JE, Kirkpatrick JP, Friedman HS, Vredenburgh JJ, Nayak L, Panageas KS, Deangelis LM, Abrey LE, Lassman AB. Ongoing Clinical Trials. Neuro Oncol 2010. [DOI: 10.1093/neuonc/noq116.s9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Del Maestro RF, Siu V, Seyed Sadr M, Alshami J, Sabau C, Seyed Sadr E, Samani A, Assadian S, Greaves K, Pouliot J. The temozolomide O6-methylguanine-DNA methyltransferase (MGMT) study: A phase II trial to evaluate the effect of low-dose preoperative neoadjuvant temozolomide on brain tumour MGMT activity in glioma patients. J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.e13027] [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] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
e13027 Background: Epigenetic methylation of the O6-methylguanine-DNA methyltransferase (MGMT) DNA repair gene promoter in tumor tissue from glioblastoma multiforme patients is associated with improved survival after treatment with radiotherapy plus concomitant and adjuvant temozolomide (TMZ). We hypothesized that MGMT promoter methylation mosaicism exists in glial tumors and would affect response to TMZ. Methods: This is a nonrandomized, prospective, open-label, two cohort, single-center phase II study. Twenty-three patients with brain tumors detected by MRI scan and suspected to be gliomas were evaluated. All eligible patients were treatment naive and were self-selected into a TMZ group or a control group. The primary goal of the study was to evaluate the effect of TMZ 75 mg/m2 daily prior to surgery on the brain tumor MGMT expression. Secondary endpoints included safety, tolerability, and MGMT promoter methylation mosaicism in glial tumors. Samples were obtained from multiple regions of each tumor intra-operatively and were analyzed by methylation specific PCR. Results: Our results on MGMT promoter methylation demonstrate that three groups of patients can be identified: Type I: all sites assessed in the tumor demonstrate no methylation of the MGMT promoter; Type II: all sites demonstrate high levels of MGMT promoter methylation; and Type III: a mixed promoter methylation pattern is observed. Conclusions: These results suggest that 1) preoperative neoadjuvant temozolomide is not associated with increased postoperative complications; 2) glial tumors can have very heterogeneous areas of MGMT promoter methylation; and 3) three patterns of MGMT promoter methylation can be discerned. This experimental paradigm may be a useful experimental platform for the assessment of the effect of new drugs at the tumor level. [Table: see text]
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Affiliation(s)
- R. F. Del Maestro
- Montreal Neurological Institute and Hospital, Montreal, QC, Canada; Schering Plough, Montreral, QC, Canada
| | - V. Siu
- Montreal Neurological Institute and Hospital, Montreal, QC, Canada; Schering Plough, Montreral, QC, Canada
| | - M. Seyed Sadr
- Montreal Neurological Institute and Hospital, Montreal, QC, Canada; Schering Plough, Montreral, QC, Canada
| | - J. Alshami
- Montreal Neurological Institute and Hospital, Montreal, QC, Canada; Schering Plough, Montreral, QC, Canada
| | - C. Sabau
- Montreal Neurological Institute and Hospital, Montreal, QC, Canada; Schering Plough, Montreral, QC, Canada
| | - E. Seyed Sadr
- Montreal Neurological Institute and Hospital, Montreal, QC, Canada; Schering Plough, Montreral, QC, Canada
| | - A. Samani
- Montreal Neurological Institute and Hospital, Montreal, QC, Canada; Schering Plough, Montreral, QC, Canada
| | - S. Assadian
- Montreal Neurological Institute and Hospital, Montreal, QC, Canada; Schering Plough, Montreral, QC, Canada
| | - K. Greaves
- Montreal Neurological Institute and Hospital, Montreal, QC, Canada; Schering Plough, Montreral, QC, Canada
| | - J. Pouliot
- Montreal Neurological Institute and Hospital, Montreal, QC, Canada; Schering Plough, Montreral, QC, Canada
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Nanayakkara ND, Chiu B, Samani A, Spence JD, Samarabandu J, Fenster A. A non-rigid image registration technique for 3D ultrasound carotid images using a "twisting and bending" model. Conf Proc IEEE Eng Med Biol Soc 2006; 2006:2738-2741. [PMID: 17945733 DOI: 10.1109/iembs.2006.259219] [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] [Indexed: 05/25/2023]
Abstract
Atherosclerosis at the carotid bifurcation resulting in cerebral emboli is a major cause of ischemic stroke. Most strokes associated with carotid atherosclerosis can be prevented by lifestyle/dietary changes and pharmacological treatments if identified early by monitoring carotid plaque changes. Sensitive monitoring of plaque changes in volume and morphology requires that 3D ultrasound (US) images of carotid plaque obtained at different time points be registered and evaluated for change. This registration technique should be non-rigid, since different head positions in image acquisitions cause relative bending and torsion in the neck, producing non-linear deformations between the images. We modeled the movement of the neck using a "twisting and bending model" with only six parameters for non-rigid registration. We used a Mutual Information (MI) based image similarity measure with the Powell optimization method as they have been used effectively in US image registration applications. For evaluation of our algorithm, we acquired 3D US carotid images from three subjects at two different head positions to simulate images acquired at different times. Then, we registered each image set using our "twisting bending model" based non-rigid registration algorithm. We calculated the Mean Registration Error (MRE) between the segmented vessel surfaces in the target image and the registered image using a distance-based error metric. We repeated the experiment with only rigid registration to compare the capabilities of the proposed algorithm in improving registration of 3D carotid US images. The average registration error was 1.03+/-0.23 mm using our non-rigid registration technique, while it was 1.50+/-0.50 mm when we applied the rigid registration alone.
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Affiliation(s)
- N D Nanayakkara
- Imaging Res. Lab., Univ. of Western Ontario, London, Ont., Canada.
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Bishop J, Samani A, Sciarretta J, Luginbuhl C, Plewes DB. A signal/noise analysis of quasi-static MR elastography. IEEE Trans Med Imaging 2001; 20:1183-1187. [PMID: 11700744 DOI: 10.1109/42.963821] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In quasi-static magnetic resonance elastography, strain images of a tissue or material undergoing deformation are produced. In this paper, the signal/noise (S/N) ratio [SNR] of elastographic strain images, as measured by a phase-contrast technique, is analyzed. Experiments are conducted to illustrate how diffusion-mediated signal attenuation limits maximum strain SNR in small displacement cases, while the imaging point-spread function limits large displacement cases. A simple theoretical treatment agrees well with experiments and shows how an optimal displacement encoding moment can be predicted for a given experimental set of parameters to achieve a maximum strain SNR. A further experiment demonstrates how the limitation on strain SNR posed by the imaging point-spread function may potentially be overcome.
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Abstract
A reconstruction technique for breast tissue elasticity modulus is described. This technique assumes that the geometry of normal and suspicious tissues is available from a contrast-enhanced magnetic resonance image. Furthermore, it is assumed that the modulus is constant throughout each tissue volume. The technique, which uses quasi-static strain data, is iterative where each iteration involves modulus updating followed by stress calculation. Breast mechanical stimulation is assumed to be done by two compressional rigid plates. As a result, stress is calculated using the finite element method based on the well-controlled boundary conditions of the compression plates. Using the calculated stress and the measured strain, modulus updating is done element-by-element based on Hooke's law. Breast tissue modulus reconstruction using simulated data and phantom modulus reconstruction using experimental data indicate that the technique is robust.
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Affiliation(s)
- A Samani
- Department of Medical Biophysics, University of Toronto, ON, Canada.
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Samani A, Bishop J, Yaffe MJ, Plewes DB. Biomechanical 3-D finite element modeling of the human breast using MRI data. IEEE Trans Med Imaging 2001; 20:271-279. [PMID: 11370894 DOI: 10.1109/42.921476] [Citation(s) in RCA: 112] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Breast tissue deformation modeling has recently gained considerable interest in various medical applications. A biomechanical model of the breast is presented using a finite element (FE) formulation. Emphasis is given to the modeling of breast tissue deformation which takes place in breast imaging procedures. The first step in implementing the FE modeling (FEM) procedure is mesh generation. For objects with irregular and complex geometries such as the breast, this step is one of the most difficult and tedious tasks. For FE mesh generation, two automated methods are presented which process MRI breast images to create a patient-specific mesh. The main components of the breast are adipose, fibroglandular and skin tissues. For modeling the adipose and fibroglandular tissues, we used eight noded hexahedral elements with hyperelastic properties, while for the skin, we chose four noded hyperelastic membrane elements. For model validation, an MR image of an agarose phantom was acquired and corresponding FE meshes were created. Based on assigned elasticity parameters, a numerical experiment was performed using the FE meshes, and good results were obtained. The model was also applied to a breast image registration problem of a volunteer's breast. Although qualitatively reasonable, further work is required to validate the results quantitatively.
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Affiliation(s)
- A Samani
- Department of Medical Biophysics, Sunnybrook and Women's College Health Sciences Centre, University of Toronto, ON, Canada.
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Tascou S, Nayernia K, Samani A, Schmidtke J, Vogel T, Engel W, Burfeind P. Immortalization of murine male germ cells at a discrete stage of differentiation by a novel directed promoter-based selection strategy. Biol Reprod 2000; 63:1555-61. [PMID: 11058565 DOI: 10.1095/biolreprod63.5.1555] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
We developed a novel promoter-based selection strategy that could be used to produce cell lines representing sequential stages of spermatogenesis. The method is based on immortalization and subsequent targeted selection by using differentiation-specific promoter regions. As an example for this approach, a new murine germ cell line (GC-4spc) was established using a vector construct that contains the SV40 large T antigen and the neomycin phosphotransferase II gene under the control of the SV40 early promoter and a spermatocyte-specific promoter for human phosphoglycerate kinase 2, respectively. The GC-4spc was characterized as a cell line at the stage between preleptotene and early pachytene spermatocytes. Transcription of three germ cell-specific expressed genes, Pgk2, proacrosin, and the A-myb proto-oncogene, were detected in the GC-4spc cell line using reverse transcription-polymerase chain reaction. Furthermore, TSPY (human testis-specific protein, Y-encoded) and PGK2 (human phosphoglycerate kinase 2) promoter regions showed different transcriptional activities in the GC-4spc cell line compared with the spermatogonia-derived cell line GC-1spg. Thus, our strategy could be used for immortalization of cells at specific stages of differentiation, allowing production of a series of cultured cell lines representing sequential stages of differentiation in given cell lineages.
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Affiliation(s)
- S Tascou
- Institute of Human Genetics, University of Göttingen, 37073 Göttingen, Germany Institute of Human Genetics, Medical High School of Hannover, Hannover, Germany
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Brodt P, Samani A, Navab R. Inhibition of the type I insulin-like growth factor receptor expression and signaling: novel strategies for antimetastatic therapy. Biochem Pharmacol 2000; 60:1101-7. [PMID: 11007947 DOI: 10.1016/s0006-2952(00)00422-6] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The receptor for the type 1 insulin-like growth factor (IGF-1R) plays a critical role in the acquisition of the malignant phenotype. Using a highly metastatic murine lung carcinoma model, it was demonstrated that this receptor regulates several cellular functions that can impact on the metastatic potential of the cells, including cellular proliferation, anchorage-independent growth, cell migration, and invasion. The tumor model was used to develop several strategies for altering receptor expression and function as means of abrogating the metastatic potential of the cells. They include stable expression in the tumor cells of IGF-1R antisense RNA and dominant negative receptor mutants in which tyrosines in the kinase domain were substituted with phenylalanine. In addition, a novel strategy was used based on altering post ligand-binding receptor turnover. This led to inhibition of receptor re-expression and signaling and resulted in increased tumor cell apoptosis. When combined with the development of viral vectors designed to deliver genetic information with high efficiency, these strategies could form the basis for development of highly specific, antimetastatic therapy in tumors with known IGF-IR involvement.
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Affiliation(s)
- P Brodt
- Department of Surgery, McGill University Health Center, Montreal, Quebec, Canada.
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Abstract
A methodology for imposing approximate plane strain conditions in magnetic resonance elastography through physical constraint is described. Under plane strain conditions, data acquisition and analysis may be conducted in two dimensions, which reduces imaging and reconstruction time significantly compared with three-dimensional analysis. Simulations and experiments are performed to illustrate the constraint concept. A signal/noise analysis of a two-dimensional linear inversion technique for relative elastic modulus is undertaken, and modifications to the numerical method are described which can reduce the SNR requirements by a factor of two to four. Experimentally measured data are reconstructed to illustrate the performance of the method.
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Affiliation(s)
- J Bishop
- Department of Medical Biophysics, University of Toronto, North York, Ontario, Canada
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Plewes DB, Bishop J, Samani A, Sciarretta J. Visualization and quantification of breast cancer biomechanical properties with magnetic resonance elastography. Phys Med Biol 2000; 45:1591-610. [PMID: 10870713 DOI: 10.1088/0031-9155/45/6/314] [Citation(s) in RCA: 250] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
A quasistatic magnetic resonance elastography (MRE) method for the evaluation of breast cancer is proposed. Using a phase contrast, stimulated echo MRI approach, strain imaging in phantoms and volunteers is presented. First-order assessment of tissue biomechanical properties based on inverse strain mapping is outlined and demonstrated. The accuracy of inverse strain imaging is studied through simulations in a two-dimensional model and in an anthropomorphic, three-dimensional finite-element model of the breast. To improve the accuracy of modulus assessment by elastography, inverse methods are discussed as an extension to strain imaging, and simulations quantify MRE in terms of displacement signal/noise required for robust inversion. A direct inversion strategy providing information on tissue modulus and pressure distribution is described along with a novel iterative method utilizing a priori knowledge of tissue geometry. It is shown that through the judicious choice of information from previous contrast-enhanced MRI breast images, MRE data acquisition requirements can be significantly reduced while maintaining robust modulus reconstruction in the presence of strain noise. An experimental apparatus for clinical breast MRE and preliminary images of a normal volunteer are presented.
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Affiliation(s)
- D B Plewes
- Department of Medical Biophysics, Sunnybrook and Women's College Health Sciences Centre, Toronto, Ontario, Canada.
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