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Pahuja A, Dhiman R, Aggarwal V, Aalok SP, Saxena R. Evaluation of Peripapillary and Macular Optical Coherence Tomography Angiography Characteristics in Different Stages of Papilledema. J Neuroophthalmol 2024; 44:53-60. [PMID: 37364246 DOI: 10.1097/wno.0000000000001908] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 06/28/2023]
Abstract
BACKGROUND Prospective evaluation of optical coherence tomography (OCT) and OCT angiography (OCT-A) characteristics in different stages of papilledema in idiopathic intracranial hypertension (IIH). METHODS In this prospective, observational study patients of IIH with papilledema were recruited and divided into 3 groups-early/established (Group 1), chronic (Group 2), and atrophic papilledema (Group 3). Peripapillary retinal nerve fiber layer (RNFL) and macular ganglion cell inner plexiform layer (GC-IPL) were recorded on OCT. Peripapillary and macular perfusion was documented at superficial retinal, deep retinal, and choriocapillary level using OCT-A. The investigations were repeated at 3 months. RESULTS RNFL showed significant thinning in all groups on follow-up with the atrophic group showing maximum thinning ( P = 0.01-Group 3). GC-IPL was significantly reduced in all stages of papilledema at baseline compared with the controls. Thinnest GC-IPL was noted in the atrophic group (52.75 ± 7.44 μm; P = 0.00 in Group 3 vs controls) that showed further deterioration on follow-up. On Image J analysis, significant decrease was noted at various levels in the peripapillary and macular perfusion at baseline especially in the atrophic group which showed further deterioration noted on follow-up. The final visual acuity showed a statistically significant weak negative correlation with baseline RNFL (r = -0.306) and GC-IPL (r = -0.384) and moderately negative correlation with baseline superficial peripapillary retinal perfusion (r = -0.553). A significant negative correlation was seen between increasing grade of papilledema and superficial peripapillary retinal perfusion with both Image J and automated indices (r = -0.46; r = -0.61), respectively. CONCLUSIONS GC-IPL may help identify early damage in papilledema even in the presence of thicker RNFL. Significant vascular changes can be observed on OCT-A that may help predict the final visual outcome in papilledema due to IIH.
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Affiliation(s)
- Akshra Pahuja
- Dr Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India
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2
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Husbands AY, Feller A, Aggarwal V, Dresden CE, Holub AS, Ha T, Timmermans MCP. The START domain potentiates HD-ZIPIII transcriptional activity. Plant Cell 2023; 35:2332-2348. [PMID: 36861320 DOI: 10.1093/plcell/koad058] [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] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 01/09/2023] [Accepted: 02/05/2023] [Indexed: 05/30/2023]
Abstract
The CLASS III HOMEODOMAIN-LEUCINE ZIPPER (HD-ZIPIII) transcription factors (TFs) were repeatedly deployed over 725 million years of evolution to regulate central developmental innovations. The START domain of this pivotal class of developmental regulators was recognized over 20 years ago, but its putative ligands and functional contributions remain unknown. Here, we demonstrate that the START domain promotes HD-ZIPIII TF homodimerization and increases transcriptional potency. Effects on transcriptional output can be ported onto heterologous TFs, consistent with principles of evolution via domain capture. We also show the START domain binds several species of phospholipids, and that mutations in conserved residues perturbing ligand binding and/or its downstream conformational readout abolish HD-ZIPIII DNA-binding competence. Our data present a model in which the START domain potentiates transcriptional activity and uses ligand-induced conformational change to render HD-ZIPIII dimers competent to bind DNA. These findings resolve a long-standing mystery in plant development and highlight the flexible and diverse regulatory potential coded within this widely distributed evolutionary module.
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Affiliation(s)
- Aman Y Husbands
- Cold Spring Harbor Laboratory, 1 Bungtown Road, Cold Spring Harbor, NY 11724, USA
- Department of Biology, University of Pennsylvania, 415 S. University Ave, Philadelphia, PA 19104, USA
| | - Antje Feller
- Center for Plant Molecular Biology, University of Tübingen, Auf der Morgenstelle 32, 72076 Tübingen, Germany
| | - Vasudha Aggarwal
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins School of Medicine, Baltimore, MD 21205, USA
| | - Courtney E Dresden
- Department of Biology, University of Pennsylvania, 415 S. University Ave, Philadelphia, PA 19104, USA
- Molecular, Cellular, and Developmental Biology (MCDB), The Ohio State University, Columbus, OH 43215, USA
| | - Ashton S Holub
- Department of Molecular Genetics, The Ohio State University, Columbus, OH 43215, USA
| | - Taekjip Ha
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins School of Medicine, Baltimore, MD 21205, USA
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins School of Medicine, Howard Hughes Medical Institute, Baltimore, MD 21205, USA
| | - Marja C P Timmermans
- Cold Spring Harbor Laboratory, 1 Bungtown Road, Cold Spring Harbor, NY 11724, USA
- Center for Plant Molecular Biology, University of Tübingen, Auf der Morgenstelle 32, 72076 Tübingen, Germany
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3
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Umanah GKE, Abalde-Atristain L, Khan MR, Mitra J, Dar MA, Chang M, Tangella K, McNamara A, Bennett S, Chen R, Aggarwal V, Cortes M, Worley PF, Ha T, Dawson TM, Dawson VL. AAA + ATPase Thorase inhibits mTOR signaling through the disassembly of the mTOR complex 1. Nat Commun 2022; 13:4836. [PMID: 35977929 PMCID: PMC9385847 DOI: 10.1038/s41467-022-32365-2] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 07/26/2022] [Indexed: 11/09/2022] Open
Abstract
The mechanistic target of rapamycin (mTOR) signals through the mTOR complex 1 (mTORC1) and the mTOR complex 2 to maintain cellular and organismal homeostasis. Failure to finely tune mTOR activity results in metabolic dysregulation and disease. While there is substantial understanding of the molecular events leading mTORC1 activation at the lysosome, remarkably little is known about what terminates mTORC1 signaling. Here, we show that the AAA + ATPase Thorase directly binds mTOR, thereby orchestrating the disassembly and inactivation of mTORC1. Thorase disrupts the association of mTOR to Raptor at the mitochondria-lysosome interface and this action is sensitive to amino acids. Lack of Thorase causes accumulation of mTOR-Raptor complexes and altered mTORC1 disassembly/re-assembly dynamics upon changes in amino acid availability. The resulting excessive mTORC1 can be counteracted with rapamycin in vitro and in vivo. Collectively, we reveal Thorase as a key component of the mTOR pathway that disassembles and thus inhibits mTORC1.
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Affiliation(s)
- George K E Umanah
- Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
- Division of Neuroscience, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Leire Abalde-Atristain
- Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
- Cellular and Molecular Medicine Graduate Program, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
- Vollum Institute, Oregon Health & Science University, Portland, OR, 97239, USA
| | - Mohammed Repon Khan
- Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
| | - Jaba Mitra
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins University, Baltimore, MD, 21205, USA
| | - Mohamad Aasif Dar
- Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
| | - Melissa Chang
- Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
| | - Kavya Tangella
- Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
| | - Amy McNamara
- Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
| | - Samuel Bennett
- Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
| | - Rong Chen
- Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
| | - Vasudha Aggarwal
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins University, Baltimore, MD, 21205, USA
| | - Marisol Cortes
- Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
| | - Paul F Worley
- Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
| | - Taekjip Ha
- Departments of Biophysics and Biophysical Chemistry, Biophysics and Biomedical Engineering, JHU Howard Hughes Medical Institute, Baltimore, MD, 21205, USA
| | - Ted M Dawson
- Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.
- Cellular and Molecular Medicine Graduate Program, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.
- Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.
- Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.
| | - Valina L Dawson
- Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.
- Cellular and Molecular Medicine Graduate Program, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.
- Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.
- Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.
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Benjamin LA, Lim E, Sokolska M, Markus J, Zaletel T, Aggarwal V, Luder R, Sanchez E, Brown K, Sofat R, Singh A, Houlihan C, Nastouli E, Losseff N, Werring DJ, Brown MM, Mason JC, Simister RJ, Jäger HR. Vessel wall magnetic resonance and arterial spin labelling imaging in the management of presumed inflammatory intracranial arterial vasculopathy. Brain Commun 2022; 4:fcac157. [PMID: 35813881 PMCID: PMC9263889 DOI: 10.1093/braincomms/fcac157] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 02/08/2022] [Accepted: 06/17/2022] [Indexed: 11/25/2022] Open
Abstract
Optimal criteria for diagnosing and monitoring response to treatment for infectious and inflammatory medium–large vessel intracranial vasculitis presenting with stroke are lacking. We integrated intracranial vessel wall MRI with arterial spin labelling into our routine clinical stroke pathway to detect presumed inflammatory intracranial arterial vasculopathy, and monitor disease activity, in patients with clinical stroke syndromes. We used predefined standardized radiological criteria to define vessel wall enhancement, and all imaging findings were rated blinded to clinical details. Between 2017 and 2018, stroke or transient ischaemic attack patients were first screened in our vascular radiology meeting and followed up in a dedicated specialist stroke clinic if a diagnosis of medium–large inflammatory intracranial arterial vasculopathy was radiologically confirmed. Treatment was determined and monitored by a multi-disciplinary team. In this case series, 11 patients were managed in this period from the cohort of young stroke presenters (<55 years). The median age was 36 years (interquartile range: 33,50), of which 8 of 11 (73%) were female. Two of 11 (18%) had herpes virus infection confirmed by viral nucleic acid in the cerebrospinal fluid. We showed improvement in cerebral perfusion at 1 year using an arterial spin labelling sequence in patients taking immunosuppressive therapy for >4 weeks compared with those not receiving therapy [6 (100%) versus 2 (40%) P = 0.026]. Our findings demonstrate the potential utility of vessel wall magnetic resonance with arterial spin labelling imaging in detecting and monitoring medium–large inflammatory intracranial arterial vasculopathy activity for patients presenting with stroke symptoms, limiting the need to progress to brain biopsy. Further systematic studies in unselected populations of stroke patients are needed to confirm our findings and establish the prevalence of medium–large artery wall inflammation.
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Affiliation(s)
- L A Benjamin
- Comprehensive Stroke Service, National Hospital for Neurology and Neurosurgery, University College London Hospitals NHS Foundation Trust, Queen Square , Box 16, London WC1N 3BG , UK
- Laboratory of Molecular and Cell Biology, UCL, Gower St, Kings Cross , London WC1E 6BT , UK
- Stroke Research Centre, UCL Queen Square Institute of Neurology, University College London , London WC1B 5EH , UK
- University of Liverpool, Brain Infections Group, Liverpool , Merseyside, L69 7BE , UK
| | - E Lim
- Department of Imaging, University College London Hospitals NHS foundation trust , London, NW1 2PG , UK
| | - M Sokolska
- Department of Medical Physics and Biomedical Engineering, University College London Hospitals NHS Foundation Trust , London, NW1 2PG , UK
| | - J Markus
- Department of Imaging, University College London Hospitals NHS foundation trust , London, NW1 2PG , UK
| | - T Zaletel
- Department of Medicine, University of Cambridge , Cambridge, CB2 1TN , UK
| | - V Aggarwal
- Comprehensive Stroke Service, National Hospital for Neurology and Neurosurgery, University College London Hospitals NHS Foundation Trust, Queen Square , Box 16, London WC1N 3BG , UK
| | - R Luder
- Department of Medicine, North Middlesex University Hospital , London, N18 1QX , UK
| | - E Sanchez
- Department of clinical virology, University College London Hospitals NHS Foundation Trust , London, NW1 2PG , UK
| | - K Brown
- Department of Virology, UK Health Security Agency , London, NW9 5EQ , UK
| | - R Sofat
- Department of Pharmacology and Therapeutics, University of Liverpool , Liverpool L69 7BE , UK
- Health Data Research , London, NW1 2BE , UK
| | - A Singh
- Department of Medicine, Royal Free Hospital Foundation Trust , London, NW3 2QG , UK
| | - C Houlihan
- Department of clinical virology, University College London Hospitals NHS Foundation Trust , London, NW1 2PG , UK
| | - E Nastouli
- Department of clinical virology, University College London Hospitals NHS Foundation Trust , London, NW1 2PG , UK
- Crick Institute , London, NW1 1AT , UK
| | - N Losseff
- Comprehensive Stroke Service, National Hospital for Neurology and Neurosurgery, University College London Hospitals NHS Foundation Trust, Queen Square , Box 16, London WC1N 3BG , UK
| | - D J Werring
- Comprehensive Stroke Service, National Hospital for Neurology and Neurosurgery, University College London Hospitals NHS Foundation Trust, Queen Square , Box 16, London WC1N 3BG , UK
- Stroke Research Centre, UCL Queen Square Institute of Neurology, University College London , London WC1B 5EH , UK
| | - M M Brown
- Stroke Research Centre, UCL Queen Square Institute of Neurology, University College London , London WC1B 5EH , UK
| | - J C Mason
- Department of Medicine, Hammersmith Hospital , London, W12 0HS , UK
- National Heart and Lung Institute, Imperial College London , London, SW3 6LY , UK
| | - R J Simister
- Comprehensive Stroke Service, National Hospital for Neurology and Neurosurgery, University College London Hospitals NHS Foundation Trust, Queen Square , Box 16, London WC1N 3BG , UK
- Stroke Research Centre, UCL Queen Square Institute of Neurology, University College London , London WC1B 5EH , UK
| | - H R Jäger
- Stroke Research Centre, UCL Queen Square Institute of Neurology, University College London , London WC1B 5EH , UK
- Department of Imaging, University College London Hospitals NHS foundation trust , London, NW1 2PG , UK
- Neuroradiological Academic Unit, UCL Queen Square Institute of Neurology, University College London , London, WC1N 3BG , UK
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Baptiste C, Mellis R, Aggarwal V, Lord J, Eberhardt R, Kilby MD, Maher ER, Wapner R, Giordano J, Chitty LS. Fetal central nervous system anomalies: When should we offer exome sequencing? Prenat Diagn 2022; 42:736-743. [PMID: 35411553 DOI: 10.1002/pd.6145] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 04/06/2022] [Accepted: 04/07/2022] [Indexed: 11/06/2022]
Abstract
OBJECTIVE To investigate the detection of pathogenic variants using exome sequencing in an international cohort of fetuses with central nervous system (CNS) anomalies. METHODS We reviewed trio exome sequencing (ES) results for two previously reported unselected cohorts (Prenatal Assessment of Genomes and Exomes (PAGE) and CUIMC) to identify fetuses with CNS anomalies with unremarkable karyotypes and chromosomal microarrays. Variants were classified according to ACMG guidelines and association of pathogenic variants with specific types of CNS anomalies explored. RESULTS ES was performed in 268 pregnancies with a CNS anomaly identified using prenatal ultrasound . Of those with an isolated, single, CNS anomaly, 7/97 (7.2%) had a likely pathogenic/pathogenic (LP/P) variant. This includes 3/23 (13%) fetuses with isolated mild ventriculomegaly and 3/10 (30%) fetuses with isolated agenesis of the corpus callosum. Where there were multiple anomalies within the CNS, 12/63 (19%) had LP/P variants. Of the 108 cases with CNS and other organ system anomalies, 18 (16.7%) had LP/P findings. CONCLUSION ES is an important tool in the prenatal evaluation of fetuses with any CNS anomaly. The rate of LP/P variants tends to be highest in fetuses with multiple CNS anomalies and multisystem anomalies, however, ES may also be of benefit for isolated CNS anomalies.
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Affiliation(s)
- C Baptiste
- Columbia University Irving Medical Center, 3959 Broadway, New York, 10032-3784, United States
| | - R Mellis
- Genetics and Genomic MedicineUCL GOS Institute of Child Health, UCL, 30 Guilford St, London, WC1N 1EH, United Kingdom of Great Britain and Northern Ireland
| | - V Aggarwal
- Columbia University Irving Medical Center, New York, United States
| | - J Lord
- Southampton University Hospitals NHS Trust, Southampton, United Kingdom of Great Britain and Northern Ireland
| | - R Eberhardt
- Wellcome Sanger Institute, Hinxton, Cambridgeshire, United Kingdom of Great Britain and Northern Ireland
| | - M D Kilby
- Dept. of Fetal Medicine, Birmingham Women's Hospital, Metchley Park rd.Edgbaston, Birmingham, West Midlands, B15 2TG, United Kingdom of Great Britain and Northern Ireland
| | - E R Maher
- University of Cambridge, Cambridge, United Kingdom of Great Britain and Northern Ireland
| | - R Wapner
- Obstetrics and Gynecology, Columbia University Medical Centerm, New York, United States
| | - J Giordano
- MFM, Columbia University, 3959 Broadway, New York, 10032, United States
| | - L S Chitty
- Genetics and Genomic Medicine, UCL Institute of Child Health, UCL Great Ormond Street Institute of Child Health.30 Guilford Street, WC1N 1EH, London, United Kingdom of Great Britain and Northern Ireland
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Mellis R, Eberhardt RY, Hamilton SJ, McMullan DJ, Kilby MD, Maher ER, Hurles ME, Giordano JL, Aggarwal V, Goldstein DB, Wapner RJ, Chitty LS. Fetal exome sequencing for isolated increased nuchal translucency: should we be doing it? BJOG 2021; 129:52-61. [PMID: 34411415 PMCID: PMC9292445 DOI: 10.1111/1471-0528.16869] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 05/22/2021] [Accepted: 06/17/2021] [Indexed: 12/16/2022]
Abstract
Objective To evaluate the utility of prenatal exome sequencing (ES) for isolated increased nuchal translucency (NT) and to investigate factors that increase diagnostic yield. Design Retrospective analysis of data from two prospective cohort studies. Setting Fetal medicine centres in the UK and USA. Population Fetuses with increased NT ≥3.5 mm at 11–14 weeks of gestation recruited to the Prenatal Assessment of Genomes and Exomes (PAGE) and Columbia fetal whole exome sequencing studies (n = 213). Methods We grouped cases based on (1) the presence of additional structural abnormalities at presentation in the first trimester or later in pregnancy, and (2) NT measurement at presentation. We compared diagnostic rates between groups using Fisher exact test. Main outcome measures Detection of diagnostic genetic variants considered to have caused the observed fetal structural anomaly. Results Diagnostic variants were detected in 12 (22.2%) of 54 fetuses presenting with non‐isolated increased NT, 12 (32.4%) of 37 fetuses with isolated increased NT in the first trimester and additional abnormalities later in pregnancy, and 2 (1.8%) of 111 fetuses with isolated increased NT in the first trimester and no other abnormalities on subsequent scans. Diagnostic rate also increased with increasing size of NT. Conclusions The diagnostic yield of prenatal ES is low for fetuses with isolated increased NT but significantly higher where there are additional structural anomalies. Prenatal ES may not be appropriate for truly isolated increased NT but timely, careful ultrasound scanning to identify other anomalies emerging later can direct testing to focus where there is a higher likelihood of diagnosis. Prenatal ES has a low diagnostic rate (<2%) for isolated increased NT but is significantly more likely to yield a diagnosis where there are additional fetal structural anomalies. Linked article This article is commented on by AN Talati and NL Vora, p. 61–62 in this issue. To view this mini commentary visit https://doi.org/10.1111/1471-0528.16942.
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Affiliation(s)
- R Mellis
- Genetics and Genomic Medicine, UCL Great Ormond Street Institute of Child Health, London, UK.,NHS North Thames Genomic Laboratory Hub, Great Ormond Street Hospital for Children, NHS Foundation Trust, London, UK
| | | | - S J Hamilton
- NHS Central and South Genomic Laboratory Hub, Birmingham Women's and Children's NHS Foundation Trust, Birmingham, UK
| | | | - D J McMullan
- NHS Central and South Genomic Laboratory Hub, Birmingham Women's and Children's NHS Foundation Trust, Birmingham, UK
| | - M D Kilby
- Fetal Medicine Centre, Birmingham Women's and Children's NHS Foundation Trust, Birmingham, UK.,Institute of Metabolism and Systems Research, College of Medical Sciences, University of Birmingham, Birmingham, UK
| | - E R Maher
- Department of Medical Genetics, University of Cambridge, Cambridge, UK.,Department of Clinical Genetics, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
| | | | - J L Giordano
- Department of OBGYN, Columbia University Irving Medical Center, New York, NY, USA
| | - V Aggarwal
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, New York, NY, USA
| | - D B Goldstein
- Institute for Genomic Medicine, Vagelos College of Physicians and Surgeons, New York, NY, USA
| | - R J Wapner
- Department of OBGYN, Columbia University Irving Medical Center, New York, NY, USA
| | - L S Chitty
- Genetics and Genomic Medicine, UCL Great Ormond Street Institute of Child Health, London, UK.,NHS North Thames Genomic Laboratory Hub, Great Ormond Street Hospital for Children, NHS Foundation Trust, London, UK
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Mehra B, Aggarwal V, Wardhan H, Dugaya SK. Severe jejunitis masquerading as intussusception in a case of Henoch-Schönlein purpura. S AFR J SURG 2021; 59:28d-28e. [PMID: 33779105] [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: 06/12/2023]
Abstract
Intussusception is a well-known complication of Henoch-Schönlein purpura (HSP).1 Diagnosis of intussusception is based on well-defined clinical and radiological features, but certain conditions can mimic intussusception, both clinically and radiologically, so closely as to result in unnecessary invasive procedures. Authors here present a case of HSP complicated by severe acute jejunitis, masquerading as jejuno-jejunal intussusception on ultrasound.
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Affiliation(s)
- B Mehra
- Paediatric Intensive Care Unit, Max Superspeciality Hospital, India
| | - V Aggarwal
- Paediatric Intensive Care Unit, Max Superspeciality Hospital, India
| | - H Wardhan
- Paediatric Intensive Care Unit, Max Superspeciality Hospital, India
| | - S K Dugaya
- Paediatric Intensive Care Unit, Max Superspeciality Hospital, India
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Mehra B, Aggarwal V, Wardhan H, Dugaya SK. Severe jejunitis masquerading as intussusception in a case of Henoch-Schönlein purpura. S AFR J SURG 2021. [DOI: 10.17159/2078-5151/2021/v59n1a3454] [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: 11/05/2022]
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Singh A, Lantz J, Roberts N, Russell G, Margalski D, Aggarwal V, Kannan K, Dothard A, Lycan T. MO01.07 Incidence of Aggressive End of Life Measures in a Retrospective Cohort of High-Risk Patients with Advanced Lung Cancer Receiving Immunotherapy. J Thorac Oncol 2021. [DOI: 10.1016/j.jtho.2020.10.055] [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: 11/28/2022]
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10
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Gordon N, Aggarwal V, Amos B, Buhler C, Huszar A, McKenzie J, Mitchell J, Moyen N, Mubangizi P, Leslie T. The UK Fleming Fund: Developing AMR surveillance capacity in low- and middle-income countries. Int J Infect Dis 2020. [DOI: 10.1016/j.ijid.2020.09.137] [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: 10/22/2022] Open
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11
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Gupta A, Aggarwal V, Mehta N, Abraham D, Singh A. Diabetes mellitus and the healing of periapical lesions in root filled teeth: a systematic review and meta‐analysis. Int Endod J 2020; 53:1472-1484. [DOI: 10.1111/iej.13366] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Accepted: 07/08/2020] [Indexed: 12/17/2022]
Affiliation(s)
- A. Gupta
- Department of Conservative Dentistry and Endodontics Manav Rachna University FaridabadIndia
| | - V. Aggarwal
- Department of Conservative Dentistry and Endodontics, Faculty of Dentistry Jamia Milia Islamia New Delhi India
| | - N. Mehta
- Department of Conservative Dentistry and Endodontics Manav Rachna University FaridabadIndia
| | - D. Abraham
- Department of Conservative Dentistry and Endodontics Manav Rachna University FaridabadIndia
| | - A. Singh
- Department of Conservative Dentistry and Endodontics Manav Rachna University FaridabadIndia
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Hsu RYC, Lin YC, Redon C, Sun Q, Singh DK, Wang Y, Aggarwal V, Mitra J, Matur A, Moriarity B, Ha T, Aladjem MI, Prasanth KV, Prasanth SG. ORCA/LRWD1 Regulates Homologous Recombination at ALT-Telomeres by Modulating Heterochromatin Organization. iScience 2020; 23:101038. [PMID: 32344376 PMCID: PMC7186530 DOI: 10.1016/j.isci.2020.101038] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 03/26/2020] [Accepted: 04/01/2020] [Indexed: 12/23/2022] Open
Abstract
Telomeres are maintained by telomerase or in a subset of cancer cells by a homologous recombination (HR)-based mechanism, Alternative Lengthening of Telomeres (ALT). The mechanisms regulating telomere-homeostasis in ALT cells remain unclear. We report that a replication initiator protein, Origin Recognition Complex-Associated (ORCA/LRWD1), by localizing at the ALT-telomeres, modulates HR activity. ORCA's localization to the ALT-telomeres is facilitated by its interaction to SUMOylated shelterin components. The loss of ORCA in ALT-positive cells elevates the levels of two mediators of HR, RPA and RAD51, and consistent with this, we observe increased ALT-associated promyelocytic leukemia body formation and telomere sister chromatid exchange. ORCA binds to RPA and modulates the association of RPA to telomeres. Finally, the loss of ORCA causes global chromatin decondensation, including at the telomeres. Our results demonstrate that ORCA acts as an inhibitor of HR by modulating RPA binding to ssDNA and inducing chromatin compaction.
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Affiliation(s)
- Rosaline Y C Hsu
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, 601S Goodwin Avenue, Urbana, IL 61801, USA
| | - Yo-Chuen Lin
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, 601S Goodwin Avenue, Urbana, IL 61801, USA
| | - Christophe Redon
- Developmental Therapeutics Branch, Center for Cancer Research, NCI, NIH, Bethesda MD 20892, USA
| | - Qinyu Sun
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, 601S Goodwin Avenue, Urbana, IL 61801, USA
| | - Deepak K Singh
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, 601S Goodwin Avenue, Urbana, IL 61801, USA
| | - Yating Wang
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, 601S Goodwin Avenue, Urbana, IL 61801, USA
| | - Vasudha Aggarwal
- Biophysics and Biophysical Chemistry, Johns Hopkins University, Baltimore, MD 21205, USA
| | - Jaba Mitra
- Materials Engineering Department, UIUC, Urbana, IL 61801, USA
| | - Abhijith Matur
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, 601S Goodwin Avenue, Urbana, IL 61801, USA
| | | | - Taekjip Ha
- Biophysics and Biophysical Chemistry, Johns Hopkins University, Baltimore, MD 21205, USA; Howard Hughes Medical Institute, Johns Hopkins University, Baltimore, MD 21205, USA
| | - Mirit I Aladjem
- Developmental Therapeutics Branch, Center for Cancer Research, NCI, NIH, Bethesda MD 20892, USA
| | - Kannanganattu V Prasanth
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, 601S Goodwin Avenue, Urbana, IL 61801, USA; Cancer Center at Illinois, UIUC, Urbana, IL 61801, USA
| | - Supriya G Prasanth
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, 601S Goodwin Avenue, Urbana, IL 61801, USA; Cancer Center at Illinois, UIUC, Urbana, IL 61801, USA.
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Shin J, Suryapalam M, Shenoy K, O'Neill B, Bashir R, Lakhter V, O'Murchu B, Aggarwal V. Fractional Flow Reserve Guided Coronary Revascularization in Lung Transplant Recipients. J Heart Lung Transplant 2019. [DOI: 10.1016/j.healun.2019.01.814] [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: 11/24/2022] Open
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Kothari P, Srivastava V, Aggarwal V, Tchernyshyov I, Van Eyk J, Ha T, Robinson DN. Mapping the Biochemical Interactions of the Mechanoresponsive Contractility Controller. Biophys J 2019. [DOI: 10.1016/j.bpj.2018.11.669] [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: 10/27/2022] Open
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Kothari P, Srivastava V, Aggarwal V, Tchernyshyov I, Van Eyk JE, Ha T, Robinson DN. Contractility kits promote assembly of the mechanoresponsive cytoskeletal network. J Cell Sci 2019; 132:jcs.226704. [PMID: 30559246 DOI: 10.1242/jcs.226704] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [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: 10/17/2018] [Accepted: 12/05/2018] [Indexed: 01/19/2023] Open
Abstract
Cellular contractility is governed by a control system of proteins that integrates internal and external cues to drive diverse shape change processes. This contractility controller includes myosin II motors, actin crosslinkers and protein scaffolds, which exhibit robust and cooperative mechanoaccumulation. However, the biochemical interactions and feedback mechanisms that drive the controller remain unknown. Here, we use a proteomics approach to identify direct interactors of two key nodes of the contractility controller in the social amoeba Dictyostelium discoideum: the actin crosslinker cortexillin I and the scaffolding protein IQGAP2. We highlight several unexpected proteins that suggest feedback from metabolic and RNA-binding proteins on the contractility controller. Quantitative in vivo biochemical measurements reveal direct interactions between myosin II and cortexillin I, which form the core mechanosensor. Furthermore, IQGAP1 negatively regulates mechanoresponsiveness by competing with IQGAP2 for binding the myosin II-cortexillin I complex. These myosin II-cortexillin I-IQGAP2 complexes are pre-assembled into higher-order mechanoresponsive contractility kits (MCKs) that are poised to integrate into the cortex upon diffusional encounter coincident with mechanical inputs.This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
- Priyanka Kothari
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Vasudha Srivastava
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.,Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Vasudha Aggarwal
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Irina Tchernyshyov
- Department of Medicine, The Smidt Heart Institute and Advanced Clinical Biosystems Institute, Cedar-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - Jennifer E Van Eyk
- Department of Medicine, The Smidt Heart Institute and Advanced Clinical Biosystems Institute, Cedar-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - Taekjip Ha
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.,Department of Biophysics, Johns Hopkins University, Baltimore, MD 21218, USA.,Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21205, USA.,Howard Hughes Medical Institute, Baltimore, MD 21205, USA
| | - Douglas N Robinson
- Department of Cell Biology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA .,Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218, USA.,Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.,Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
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Abstract
INTRODUCTION The aim of the present study was to evaluate the effect of the application of calcium silicate materials (CSMs), after acid etching, on the longevity of the hybrid layer and marginal adaptation of composite restorations. METHODS AND MATERIALS Eighty human permanent molars received an intrapulpal pressure of 15 cm H2O. Sixty teeth received a mesial proximal slot preparation with the gingival margin extending 1 mm below the cemento-enamel junction. The samples were divided into two groups. Group 1 received restorations using two types of etch-and-rinse adhesives: ethanol based (Single Bond, 3M ESPE, St Paul, MN, USA) and acetone based (Prime & Bond NT, Dentsply, DeTrey GmbH, Germany). In group 2 samples, a commercially available CSM (ProRoot MTA) was allowed to set before grinding and placing into a distilled water solution. This solution was applied on the cavity floor after acid etching. The surface was washed after 30 seconds followed by application of adhesives and restorations as in group 1. The samples were stored in phosphate-buffered saline for six months, maintaining the intrapulpal pressure. An epoxy replica was made, and the marginal adaptation was evaluated using scanning electron microscopy. The percentage of continuous margin (CM) was recorded for each group. Another 20 samples were used for hybrid layer evaluation. The crowns were ground to expose dentin. Intrapulpal pressure was applied. The samples were divided into two groups and restored similar to samples restored for marginal adaptation evaluation. The samples were longitudinally cut in 1-mm slices. The slices were stored under 15 cm of phosphate-buffered saline to simulate the pulpal pressure. After six months, the adhesive interface was evaluated using a scanning electron microscope. Statistical analysis was done with two-way analysis of variance with Holm-Sidak's correction for multiple comparisons. RESULTS Application of CSMs improved the marginal adaptation values in both adhesive groups. In group 1, there were areas of incomplete penetration of resins along with evidence of partial degradation of resin tags. Samples receiving CSM application after acid etching demonstrated long and regular resin tags with very few signs of degradation. CONCLUSIONS Application of CSMs after acid etching can be a potential avenue in preserving the resin-dentin bonds.
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Aggarwal V, Singla M, Miglani S, Kohli S, Sharma V, Bhasin SS. Does the volume of supplemental intraligamentary injections affect the anaesthetic success rate after a failed primary inferior alveolar nerve block? A randomized-double blind clinical trial. Int Endod J 2017; 51:5-11. [PMID: 28370327 DOI: 10.1111/iej.12773] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [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: 01/04/2017] [Accepted: 03/21/2017] [Indexed: 11/28/2022]
Abstract
AIM To investigate the efficacy of 0.2 mL vs. 0.6 mL of 2% lidocaine when given as a supplementary intraligamentary injection after a failed inferior alveolar nerve block (IANB). METHODOLOGY Ninety-seven adult patients with symptomatic irreversible pulpits received an IANB and root canal treatment was initiated. Pain during treatment was recorded using a visual analogue scale (Heft-Parker VAS). Patients with unsuccessful anaesthesia (n = 78) randomly received intraligamentary injection of either 0.2 mL or 0.6 mL of 2% lidocaine with 1 : 80 000 epinephrine. Root canal treatment was reinitiated. Success after primary injection or supplementary injection was defined as no or mild pain (HP VAS score ≤54 mm) during access preparation and root canal instrumentation. Heart rate was monitored using a finger pulse oximeter. The anaesthetic success rates were analysed with Pearson chi-square test at 5% significance levels. The heart rate changes were analysed using t-tests. RESULTS The intraligamentary injections with 0.2 mL solution gave an anaesthetic success rate of 64%, whilst the 0.6 mL was successful in 84% of cases with failed primary IANB. (χ2 = 4.3, P = 0.03). There was no significant effect of the volume of intraligamentary injection on the change in heart rate. CONCLUSIONS Increasing the volume of intraligamentary injection improved the success rates after a failed primary anaesthetic injection.
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Affiliation(s)
- V Aggarwal
- Department of Conservative Dentistry & Endodontics, Faculty of Dentistry, Jamia Millia Islamia, New Delhi, India
| | - M Singla
- Department of Conservative Dentistry & Endodontics, SGT Dental College, Gurgaon, Haryana, India
| | - S Miglani
- Department of Conservative Dentistry & Endodontics, Faculty of Dentistry, Jamia Millia Islamia, New Delhi, India
| | - S Kohli
- Department of Conservative Dentistry & Endodontics, Faculty of Dentistry, Jamia Millia Islamia, New Delhi, India
| | - V Sharma
- Department of Conservative Dentistry & Endodontics, SGT Dental College, Gurgaon, Haryana, India
| | - S S Bhasin
- Department of Conservative Dentistry & Endodontics, Faculty of Dentistry, Jamia Millia Islamia, New Delhi, India
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Husbands AY, Aggarwal V, Ha T, Timmermans MCP. In Planta Single-Molecule Pull-Down Reveals Tetrameric Stoichiometry of HD-ZIPIII:LITTLE ZIPPER Complexes. Plant Cell 2016; 28:1783-94. [PMID: 27385814 PMCID: PMC5006705 DOI: 10.1105/tpc.16.00289] [Citation(s) in RCA: 10] [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] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Accepted: 07/03/2016] [Indexed: 05/12/2023]
Abstract
Deciphering complex biological processes markedly benefits from approaches that directly assess the underlying biomolecular interactions. Most commonly used approaches to monitor protein-protein interactions typically provide nonquantitative readouts that lack statistical power and do not yield information on the heterogeneity or stoichiometry of protein complexes. Single-molecule pull-down (SiMPull) uses single-molecule fluorescence detection to mitigate these disadvantages and can quantitatively interrogate interactions between proteins and other compounds, such as nucleic acids, small molecule ligands, and lipids. Here, we establish SiMPull in plants using the HOMEODOMAIN LEUCINE ZIPPER III (HD-ZIPIII) and LITTLE ZIPPER (ZPR) interaction as proof-of-principle. Colocalization analysis of fluorophore-tagged HD-ZIPIII and ZPR proteins provides strong statistical evidence of complex formation. In addition, we use SiMPull to directly quantify YFP and mCherry maturation probabilities, showing these differ substantially from values obtained in mammalian systems. Leveraging these probabilities, in conjunction with fluorophore photobleaching assays on over 2000 individual complexes, we determined HD-ZIPIII:ZPR stoichiometry. Intriguingly, these complexes appear as heterotetramers, comprising two HD-ZIPIII and two ZPR molecules, rather than heterodimers as described in the current model. This surprising result raises new questions about the regulation of these key developmental factors and is illustrative of the unique contribution SiMPull is poised to make to in planta protein interaction studies.
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Affiliation(s)
- Aman Y Husbands
- Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724
| | - Vasudha Aggarwal
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins School of Medicine, Baltimore, Maryland 21205
| | - Taekjip Ha
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins School of Medicine, Baltimore, Maryland 21205 Howard Hughes Medical Institute, Baltimore, Maryland 21205
| | - Marja C P Timmermans
- Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724 Center for Plant Molecular Biology, University of Tübingen, 72076 Tübingen, Germany
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Goldthorpe J, Peters S, Lovell K, McGowan L, Aggarwal V. 'I just wanted someone to tell me it wasn't all in my mind and do something for me': Qualitative exploration of acceptability of a CBT based intervention to manage chronic orofacial pain. Br Dent J 2016; 220:459-63. [DOI: 10.1038/sj.bdj.2016.332] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/03/2016] [Indexed: 11/09/2022]
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Aggarwal V, Singla M, Bhasin SS. Influence of instrument size and varying electrical resistance of root canal instruments on accuracy of three electronic root canal length measurement devices. Int Endod J 2016; 50:506-511. [PMID: 27079789 DOI: 10.1111/iej.12649] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [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: 05/31/2015] [Accepted: 04/07/2016] [Indexed: 11/30/2022]
Abstract
AIM To evaluate the influence of instrument size and the effect of the electrical resistance of endodontic instruments on the accuracy of three electronic root canal length measurement devices (ERCLMDs). METHODOLOGY Thirty single-rooted extracted human teeth were divided into three groups (n = 10) on the basis of the ERCLMD used: Root ZX II (J. Morita, Kyoto, Japan); ProPex (Dentsply Maillefer, Ballaigues, Switzerland); and iPex II (NSK, Tochigi, Japan). The electronic working length measurements (EWL) were made with K-files in the sequence sizes 08, 10, 15, 20, 25 and 30. The actual working length (AWL) was calculated by fixing a size 30 K-file in the canal and exposing the apical 5 mm of the root. The minor foramen was identified under an optical microscope, and its distance from the file tip was calculated. The accuracy of the ERCLMDs was evaluated in terms of percentages of accurate measurements (0.0 mm tolerance) and measurements with tolerance limits of ±0.5 mm and ±1.0 mm. The findings were analysed with the McNemar test, Pearson's chi-square tests and two-way analysis of variance. The multiple comparison procedures were carried out using Holm-Sidak method. The maximum electrical resistance tolerated by ERCLMDs was evaluated by connecting commercially available resistors between the file clip and the root canal instrument. The resistance was gradually increased until it started to affect the ERCLMD readings. RESULTS The ERCLMDs were able to actually locate the minor foramen in 7% of samples. File size did not affect the accuracy of ERCLMDs (P > 0.05). Overall, the ERCLMDs gave 65% readings within a tolerance limit of ±0.5 mm and 90% within a tolerance of ±1.0 mm. The electrical resistance of endodontic files was less than the maximum electrical resistance tolerated by ERCLMDs (0.6-1 Ω vs. 2500-4000 Ω). CONCLUSIONS The size of the root canal instrument did not affect the accuracy of ERCLMDs in this laboratory study.
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Affiliation(s)
- V Aggarwal
- Department of Conservative Dentistry & Endodontics, Faculty of Dentistry, Jamia Millia Islamia, New Delhi, India
| | - M Singla
- Department of Conservative Dentistry & Endodontics, SGT Dental College, Gurgaon, India
| | - S S Bhasin
- Faculty of Dentistry, Jamia Millia Islamia, New Delhi, India
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Abstract
Recognition of signaling phospholipids by proteins is a critical requirement for the targeting and initiation of many signaling cascades. Most biophysical methods for measuring protein interactions with signaling phospholipids use purified proteins, which do not take into account the effect of post-translational modifications and other cellular components on these interactions. To potentially circumvent these problems, we have developed a single-molecule fluorescence approach to analyzing lipid-protein interactions in crude cell extracts. As a proof of principle for this assay, we show that a variety of lipid-binding domains (LBDs) can be recruited from cell lysates specifically onto their target phospholipids. With single-molecule analysis in real-time, our assay allows direct determination of binding kinetics for transient lipid-protein interactions and has revealed unique assembly properties and multiple binding modes of different LBDs. Whereas single-copy LBDs display transient interaction with lipid vesicles, tandem-repeat LBDs, often used as lipid biosensors, tend to form stable interactions that accumulate over time. We have extended the assay to study a cellular protein, Akt, and discovered marked differences in the lipid binding properties of the full-length protein compared to its PH domain. Importantly, we have found that phosphorylation of Akt at T308 and S473 does not affect the lipid binding behaviors of Akt, contrary to the long-standing model of Akt regulation. Overall, this work establishes the single-molecule lipid pulldown assay as a simple and highly sensitive approach to interrogating lipid-protein interactions in a setting that at least partly mimics the cellular environment.
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Affiliation(s)
| | | | | | - Taekjip Ha
- Howard Hughes Medical Institute, Baltimore, Maryland 21205, United States
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Aggarwal V, Malik J, Prashant A, Jaiwal PK, Pundir CS. Amperometric determination of serum total cholesterol with nanoparticles of cholesterol esterase and cholesterol oxidase. Anal Biochem 2016; 500:6-11. [PMID: 26853742 DOI: 10.1016/j.ab.2016.01.019] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [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: 12/21/2015] [Revised: 01/21/2016] [Accepted: 01/21/2016] [Indexed: 11/25/2022]
Abstract
We describe the preparation of glutaraldehyde cross-linked and functionalized cholesterol esterase nanoparticles (ChENPs) and cholesterol oxidase nanoparticles (ChOxNPs) aggregates and their co-immobilization onto Au electrode for improved amperometric determination of serum total cholesterol. Transmission electron microscope (TEM) images of ChENPs and ChOxNPs showed their spherical shape and average size of 35.40 and 56.97 nm, respectively. Scanning electron microscope (SEM) studies of Au electrode confirmed the co-immobilization of enzyme nanoparticles (ENPs). The biosensor exhibited optimal response at pH 5.5 and 40°C within 5 s when polarized at +0.25 V versus Ag/AgCl. The working/linear range of the biosensor was 10-700 mg/dl for cholesterol. The sensor showed high sensitivity and measured total cholesterol as low as 0.1 mg/dl. The biosensor was evaluated and employed for total cholesterol determination in sera of apparently healthy and diseased persons. The analytical recovery of added cholesterol was 90%, whereas the within-batch and between-batch coefficients of variation (CVs) were less than 2% and less than 3%. There was a good correlation (r = 0.99) between serum cholesterol values as measured by the standard enzymic colorimetric method and the current method. The initial activity of ENPs/working electrode was reduced by 50% during its regular use (200 times) over a period of 60 days when stored dry at 4°C.
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Affiliation(s)
- V Aggarwal
- Department of Biochemistry, Maharshi Dayanand (M.D.) University, Rohtak, Haryana, 124001, India
| | - J Malik
- Centre for Biotechnology, Maharshi Dayanand (M.D.) University, Rohtak, Haryana, 124001, India
| | - A Prashant
- Centre for Biotechnology, Maharshi Dayanand (M.D.) University, Rohtak, Haryana, 124001, India
| | - P K Jaiwal
- Centre for Biotechnology, Maharshi Dayanand (M.D.) University, Rohtak, Haryana, 124001, India
| | - C S Pundir
- Department of Biochemistry, Maharshi Dayanand (M.D.) University, Rohtak, Haryana, 124001, India.
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Aggarwal V, Pundir CS. Rational Design of Nanoparticle Platforms for "Cutting-the-Fat": Covalent Immobilization of Lipase, Glycerol Kinase, and Glycerol-3-Phosphate Oxidase on Metal Nanoparticles. Methods Enzymol 2016; 571:197-223. [PMID: 27112401 DOI: 10.1016/bs.mie.2016.01.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The aggregates of nanoparticles (NPs) are considered better supports for the immobilization of enzymes, as these promote enzyme kinetics, due to their unusual but favorable properties such as larger surface area to volume ratio, high catalytic efficiency of certain immobilized enzymes, non-toxicity of some of the nanoparticle matrices, high stability, strong adsorption of the enzyme of interest by a number of different approaches, and faster electron transportability. Co-immobilization of multiple enzymes required for a multistep reaction cascade on a single support is more efficient than separately immobilizing the corresponding enzymes and mixing them physically, since products of one enzyme could serve as reactants for another. These products can diffuse much more easily between enzymes on the same particle than diffusion from one particle to the next, in the reaction medium. Thus, co-immobilization of enzymes onto NP aggregates is expected to produce faster kinetics than their individual immobilizations on separate matrices. Lipase, glycerol kinase, and glycerol-3-phosphate oxidase are required for lipid analysis in a cascade reaction, and we describe the co-immobilization of these three enzymes on nanocomposites of zinc oxide nanoparticles (ZnONPs)-chitosan (CHIT) and gold nanoparticles-polypyrrole-polyindole carboxylic acid (AuPPy-Pin5COOH) which are electrodeposited on Pt and Au electrodes, respectively. The kinetic properties and analytes used for amperometric determination of TG are fully described for others to practice in a trained laboratory. Cyclic voltammetry, scanning electron microscopy, Fourier transform infra-red spectra, and electrochemical impedance spectra confirmed their covalent co-immobilization onto electrode surfaces through glutaraldehyde coupling on CHIT-ZnONPs and amide bonding on AuPPy/Pin5COOH. The combined activities of co-immobilized enzymes was tested amperometrically, and these composite nanobiocatalysts showed optimum activity within 4-5s, at pH 6.5-7.5 and 35°C, when polarized at a potential between 0.1 and 0.4V. Co-immobilized enzymes showed excellent linearity within 50-700mg/dl of the lipid with detection limit of 20mg/dl for triolein. The half life of co-immobilized enzymes was 7 months, when stored dry at 4°C which is very convenient for practical applications. Co-immobilized biocatalysts measured triglycerides in the sera of apparently healthy persons and persons suffering from hypertriglyceridemia, which is recognized as a leading cause for heart disease. The measurement of serum TG by co-immobilized enzymes was unaffected by the presence of a number of serum substances, tested as potential interferences. Thus, co-immobilization of enzymes onto aggregates of NPs resulted in improved performance for TG analysis.
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Affiliation(s)
- V Aggarwal
- Department of Biochemistry, Maharshi Dayanand University, Rohtak, Haryana, India
| | - C S Pundir
- Department of Biochemistry, Maharshi Dayanand University, Rohtak, Haryana, India.
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Giri S, Aggarwal V, Pontis J, Shen Z, Chakraborty A, Khan A, Mizzen C, Prasanth KV, Ait-Si-Ali S, Ha T, Prasanth SG. The preRC protein ORCA organizes heterochromatin by assembling histone H3 lysine 9 methyltransferases on chromatin. eLife 2015; 4. [PMID: 25922909 PMCID: PMC4442312 DOI: 10.7554/elife.06496] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Accepted: 04/27/2015] [Indexed: 12/20/2022] Open
Abstract
Heterochromatic domains are enriched with repressive histone marks, including histone H3 lysine 9 methylation, written by lysine methyltransferases (KMTs). The pre-replication complex protein, origin recognition complex-associated (ORCA/LRWD1), preferentially localizes to heterochromatic regions in post-replicated cells. Its role in heterochromatin organization remained elusive. ORCA recognizes methylated H3K9 marks and interacts with repressive KMTs, including G9a/GLP and Suv39H1 in a chromatin context-dependent manner. Single-molecule pull-down assays demonstrate that ORCA-ORC (Origin Recognition Complex) and multiple H3K9 KMTs exist in a single complex and that ORCA stabilizes H3K9 KMT complex. Cells lacking ORCA show alterations in chromatin architecture, with significantly reduced H3K9 di- and tri-methylation at specific chromatin sites. Changes in heterochromatin structure due to loss of ORCA affect replication timing, preferentially at the late-replicating regions. We demonstrate that ORCA acts as a scaffold for the establishment of H3K9 KMT complex and its association and activity at specific chromatin sites is crucial for the organization of heterochromatin structure. DOI:http://dx.doi.org/10.7554/eLife.06496.001 The genetic material inside cells is contained within molecules of DNA. In animals and other eukaryotes, the DNA is tightly wrapped around proteins called histones to form a compact structure known as chromatin. There are two forms of chromatin: loosely packed chromatin tends to contain genes that are highly active in cells, while tightly packed chromatin—called heterochromatin—tends to contain less-active genes. How tightly DNA is packed in chromatin can be changed by adding small molecules known as methyl tags to individual histone proteins. Enzymes called KMTs are responsible for attaching these methyl tags to a specific site on the histones. Before a cell divides, it duplicates its DNA and these methyl tags, so that they can be passed onto the newly formed cells. This enables the new cells to ‘remember’ which genes were inactive or active in the original cell. A protein known as ORCA associates with heterochromatin, but it is not clear what role it plays in controlling the structure of chromatin. Giri et al. studied ORCA and the KMTs in human cells. The experiments show that ORCA recognizes the methyl tags and binds to the KMTs in regions of heterochromatin, but not in regions where the DNA is more loosely packed. Next, Giri et al. used a technique called single-molecule pull-down, which is able to identify individual proteins within a group. These experiments showed that several KMT enzymes can bind to a single ORCA protein at the same time. ORCA stabilizes the binding of KMTs to chromatin, which enables the KMTs to modify the histones within it. Cells lacking ORCA had fewer methyl tags on their histones, which altered the structure of the chromatin. This also affected the timing with which DNA copying takes place in cells before the cell divides. Giri et al.'s findings suggest that ORCA acts as a scaffold for the KMTs and that its activity at specific sites on chromatin is important for the organization of heterochromatin. The next step is to identify the exact regions in the genome where the timing of DNA copying is regulated by ORCA. DOI:http://dx.doi.org/10.7554/eLife.06496.002
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Affiliation(s)
- Sumanprava Giri
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, Champaign, United States
| | - Vasudha Aggarwal
- Center for Biophysics and Computational Biology, University of Illinois at Urbana-Champaign, Champaign, United States
| | - Julien Pontis
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire Epigénétique et Destin Cellulaire, UMR7216, Centre National de la Recherche Scientifique, Paris, France
| | - Zhen Shen
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, Champaign, United States
| | - Arindam Chakraborty
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, Champaign, United States
| | - Abid Khan
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, Champaign, United States
| | - Craig Mizzen
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, Champaign, United States
| | - Kannanganattu V Prasanth
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, Champaign, United States
| | - Slimane Ait-Si-Ali
- Université Paris Diderot, Sorbonne Paris Cité, Laboratoire Epigénétique et Destin Cellulaire, UMR7216, Centre National de la Recherche Scientifique, Paris, France
| | - Taekjip Ha
- Center for Biophysics and Computational Biology, University of Illinois at Urbana-Champaign, Champaign, United States
| | - Supriya G Prasanth
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, Champaign, United States
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Macera MJ, Sobrino A, Levy B, Jobanputra V, Aggarwal V, Mills A, Esteves C, Hanscom C, Pereira S, Pillalamarri V, Ordulu Z, Morton CC, Talkowski M, Warburton D. Prenatal diagnosis of chromothripsis, with nine breaks characterized by karyotyping, FISH, microarray and whole-genome sequencing. Prenat Diagn 2015; 35:299-301. [PMID: 25043231 DOI: 10.1002/pd.4456] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 07/02/2014] [Accepted: 07/03/2014] [Indexed: 01/15/2023]
Affiliation(s)
- M J Macera
- New York Presbyterian Hospital, Columbia University Medical Center, New York, NY, USA
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Abstract
The mammalian target of rapamycin (mTOR) kinase is a master regulator of cellular, developmental, and metabolic processes. Deregulation of mTOR signaling is implicated in numerous human diseases including cancer and diabetes. mTOR functions as part of either of the two multisubunit complexes, mTORC1 and mTORC2, but molecular details about the assembly and oligomerization of mTORCs are currently lacking. We use the single-molecule pulldown (SiMPull) assay that combines principles of conventional pulldown assays with single-molecule fluorescence microscopy to investigate the stoichiometry and assembly of mTORCs. After validating our approach with mTORC1, confirming a dimeric assembly as previously reported, we show that all major components of mTORC2 exist in two copies per complex, indicating that mTORC2 assembles as a homodimer. Interestingly, each mTORC component, when free from the complexes, is present as a monomer and no single subunit serves as the dimerizing component. Instead, our data suggest that dimerization of mTORCs is the result of multiple subunits forming a composite surface. SiMPull also allowed us to distinguish complex disassembly from stoichiometry changes. Physiological conditions that abrogate mTOR signaling such as nutrient deprivation or energy stress did not alter the stoichiometry of mTORCs. On the other hand, rapamycin treatment leads to transient appearance of monomeric mTORC1 before complete disruption of the mTOR-raptor interaction, whereas mTORC2 stoichiometry is unaffected. These insights into assembly of mTORCs may guide future mechanistic studies and exploration of therapeutic potential.
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Affiliation(s)
- Ankur Jain
- Center for Biophysics and Computational Biology, Institute for Genomic Biology
| | - Edwin Arauz
- Department of Cell and Developmental Biology
| | - Vasudha Aggarwal
- Center for Biophysics and Computational Biology, Institute for Genomic Biology
| | - Nikita Ikon
- Department of Cell and Developmental Biology
| | - Jie Chen
- Department of Cell and Developmental Biology,
| | - Taekjip Ha
- Center for Biophysics and Computational Biology, Institute for Genomic Biology, Department of Physics, and Howard Hughes Medical Institute, University of Illinois at Urbana-Champaign, Urbana, IL 61801
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27
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Malaviya A, Aggarwal V, Rawat R, Gogia S. Axial-spondyloarthritis (ax-SpA) from single rheumatology clinic in New Delhi – III: How did they find a rheumatologist (with whose reference), who were the prior care-givers, what was the diagnosis and what treatments were given. Indian Journal of Rheumatology 2014. [DOI: 10.1016/j.injr.2014.10.141] [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: 10/24/2022] Open
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28
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Affiliation(s)
- Vasudha Aggarwal
- Center for Biophysics and Computational Biology; University of Illinois Urbana Champaign; Urbana IL USA
| | - Taekjip Ha
- Center for Biophysics and Computational Biology; University of Illinois Urbana Champaign; Urbana IL USA
- Department of Physics; University of Illinois Urbana Champaign; Urbana IL USA
- Howard Hughes Medical Institute; Urbana IL USA
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29
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Singla M, Subbiya A, Aggarwal V, Vivekanandhan P, Yadav S, Yadav H, Venkatesh A, Geethapriya N, Sharma V. Comparison of the anaesthetic efficacy of different volumes of 4% articaine (1.8 and 3.6 mL) as supplemental buccal infiltration after failed inferior alveolar nerve block. Int Endod J 2014; 48:103-8. [PMID: 24661235 DOI: 10.1111/iej.12283] [Citation(s) in RCA: 23] [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] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Accepted: 03/18/2014] [Indexed: 12/01/2022]
Abstract
AIM To compare the anaesthetic efficacy of different volumes (1.8 mL vs. 3.6 mL) of 4% articaine with 1 : 100 000 epinephrine injected as buccal infiltrations after a failed inferior alveolar nerve block (IANB) in patients with symptomatic irreversible pulpitis. METHODOLOGY Two hundred and thirty-four adult patients, diagnosed with irreversible pulpitis in a mandibular tooth, participated in this multicentre, randomized double-blinded trial. Patients received IANB with 1.8 mL of 4% articaine with 1 : 100 000 epinephrine. Pain during treatment was recorded using the Heft-Parker visual analogue scale (HP VAS). The primary outcome measure, and the definition of 'success', was the ability to undertake pulp chamber access and canal instrumentation with no or mild pain (HP VAS score <55 mm). Patients who experienced 'moderate-to-severe' pain (HP VAS score ≥ 55 mm) were randomly allocated into two groups and received buccal infiltrations with either 1.8 mL or 3.6 mL of 4% articaine with 1 : 100 000 epinephrine. Root canal treatment was re-initiated after 10 min. Success was again defined as no pain or weak/mild pain during endodontic access preparation and instrumentation. Statistical analysis was performed using Mann-Whitney U and chi-square tests. RESULTS The initial IANB of 4% articaine gave an overall success rate of 37%. The success rate of supplementary buccal infiltration with 1.8 and 3.6 mL volumes was 62% and 64%, respectively. The difference between the success rates of the two volumes was not statistically significant. CONCLUSIONS Increasing the volume of 4% articaine with 1 : 100 000 epinephrine from 1.8 to 3.6 mL, given as supplementary buccal infiltrations after a failed primary IANB with 1.8 mL of 4% articaine with 1 : 100 000, did not improve the anaesthetic success rates in patients with symptomatic irreversible pulpitis.
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Affiliation(s)
- M Singla
- Department of Conservative Dentistry & Endodontics, SGT Dental College, Gurgaon, India
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30
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Aggarwal V, Singla M, Yadav S, Yadav H. The effect of caries excavation methods on the bond strength of etch-and-rinse and self-etch adhesives to caries affected dentine. Aust Dent J 2013; 58:454-60. [DOI: 10.1111/adj.12121] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/27/2013] [Indexed: 11/30/2022]
Affiliation(s)
- V Aggarwal
- Department of Conservative Dentistry and Endodontics; Faculty of Dentistry; Jamia Millia Islamia; New Delhi India
| | - M Singla
- Department of Conservative Dentistry and Endodontics; SGT Dental College; Gurgaon India
| | - S Yadav
- Department of Conservative Dentistry and Endodontics; SGT Dental College; Gurgaon India
| | - H Yadav
- Department of Prosthodontics; SGT Dental College; Gurgaon India
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31
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Aggarwal V. What will it take. Br Dent J 2013; 215:267. [DOI: 10.1038/sj.bdj.2013.891] [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: 11/09/2022]
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32
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Aggarwal V, Singla M, Miglani S, Kohli S. Comparison of the anaesthetic efficacy of epinephrine concentrations (1 : 80 000 and 1 : 200 000) in 2% lidocaine for inferior alveolar nerve block in patients with symptomatic irreversible pulpitis: a randomized, double-blind clinical trial. Int Endod J 2013; 47:373-9. [PMID: 23895176 DOI: 10.1111/iej.12157] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [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: 02/21/2013] [Accepted: 06/30/2013] [Indexed: 11/27/2022]
Abstract
AIM The aim of this randomized controlled, double-blind trial was to comparatively evaluate the anaesthetic efficacy and injection pain of 1.8 mL of 2% lidocaine with different concentrations of epinephrine (1 : 80 000 and 1 : 200 000) in patients with symptomatic irreversible pulpitis. METHODOLOGY Sixty-two adult volunteers, actively experiencing pain, were randomly allocated into 2 groups and received 1.8 mL of 2% lidocaine with either 1 : 80 000 or 1 : 200 000 epinephrine concentration. Endodontic access preparation was initiated 15 min after the initial IANB. Pain during treatment was recorded using the Heft-Parker visual analogue scale (HP VAS). The primary outcome measure, and the definition of 'success', was the ability to undertake pulp access and canal instrumentation with no or mild pain (HP VAS score <55 mm). Secondary outcome measure was the pain experienced during LA solution deposition. Statistical analysis was performed using Mann-Whitney U-test and chi-square test. RESULTS The anaesthetic success rates of 2% lidocaine solutions containing 1 : 80 000 and 1 : 200 000 epinephrine concentrations were 20% and 28%, respectively. The difference was not statistically significant. There was also no significant difference in the pain experienced during deposition of the solutions. CONCLUSIONS Two percent lidocaine solution used for IANB achieved similar success rates when used with 1 : 80 000 or 1 : 200 000 epinephrine concentration.
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Affiliation(s)
- V Aggarwal
- Department of Conservative Dentistry & Endodontics, Faculty of Dentistry, Jamia Millia Islamia, New Delhi, India
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33
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Abstract
Ingestion of foreign bodies in neonates is very rare and can be life threatening. We describe a 20 days old neonate presented with vomiting, drooling of saliva and poor feeding tolerance. Chest radiograph showed a metallic foreign body in superior mediastinum. Foreign body was removed by rigid oesophagoscopy. The case describes the unusual age of presentation of foreign body and options available to remove these foreign bodies in neonates. Key words: Esophagus; Foreign body; Neonate DOI: http://dx.doi.org/10.3126/jnps.v32i1.5306 J. Nepal Paediatr. Soc. Vol.32(1) 2012 79-80
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34
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Aggarwal V, Kulothungan SR, Balamurali MM, Saranya SR, Varadarajan R, Ainavarapu SRK. Ligand-modulated parallel mechanical unfolding pathways of maltose-binding proteins. J Biol Chem 2011; 286:28056-65. [PMID: 21659518 DOI: 10.1074/jbc.m111.249045] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Protein folding and unfolding are complex phenomena, and it is accepted that multidomain proteins generally follow multiple pathways. Maltose-binding protein (MBP) is a large (a two-domain, 370-amino acid residue) bacterial periplasmic protein involved in maltose uptake. Despite the large size, it has been shown to exhibit an apparent two-state equilibrium unfolding in bulk experiments. Single-molecule studies can uncover rare events that are masked by averaging in bulk studies. Here, we use single-molecule force spectroscopy to study the mechanical unfolding pathways of MBP and its precursor protein (preMBP) in the presence and absence of ligands. Our results show that MBP exhibits kinetic partitioning on mechanical stretching and unfolds via two parallel pathways: one of them involves a mechanically stable intermediate (path I) whereas the other is devoid of it (path II). The apoMBP unfolds via path I in 62% of the mechanical unfolding events, and the remaining 38% follow path II. In the case of maltose-bound MBP, the protein unfolds via the intermediate in 79% of the cases, the remaining 21% via path II. Similarly, on binding to maltotriose, a ligand whose binding strength with the polyprotein is similar to that of maltose, the occurrence of the intermediate is comparable (82% via path I) with that of maltose. The precursor protein preMBP also shows a similar behavior upon mechanical unfolding. The percentages of molecules unfolding via path I are 53% in the apo form and 68% and 72% upon binding to maltose and maltotriose, respectively, for preMBP. These observations demonstrate that ligand binding can modulate the mechanical unfolding pathways of proteins by a kinetic partitioning mechanism. This could be a general mechanism in the unfolding of other large two-domain ligand-binding proteins of the bacterial periplasmic space.
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Affiliation(s)
- Vasudha Aggarwal
- Department of Biological Sciences, Tata Institute of Fundamental Research, Colaba, Mumbai 400 005, India
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35
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Shore S, Aggarwal V, Zolty R. 215 Higher Doses of Spirinolactone Are Associated with Lower Survival in Patients with Congestive Heart Failure. J Heart Lung Transplant 2011. [DOI: 10.1016/j.healun.2011.01.222] [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: 10/18/2022] Open
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36
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Shore S, Aggarwal V, Messinger M, Zolty R. 499 Improved Survival with Statin Use in Patients with Pulmonary Arterial Hypertension and Heart Failure with Normal Ejection Fraction. J Heart Lung Transplant 2011. [DOI: 10.1016/j.healun.2011.01.509] [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: 11/30/2022] Open
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37
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Shore S, Aggarwal V, Zolty R. 214 Improved Survival with Sustained Release Metoprolol When Compared to Carvedilol in Patients with Ischemic Heart Failure: A Comparative Effectiveness Analysis. J Heart Lung Transplant 2011. [DOI: 10.1016/j.healun.2011.01.221] [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: 11/27/2022] Open
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38
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Singh UP, Aggarwal V. Structural studies of nickel(II) complexes with 1-tert-butylimidazole-2-thione and 3-phenyl-5-methyl-pyrazole ligands. J STRUCT CHEM+ 2009. [DOI: 10.1007/s10947-009-0102-3] [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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39
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Abstract
AIM Complicated crown fractures involve enamel, dentine and the pulp. The incidence of complicated crown fractures ranges from 2% to 13% of all dental injuries and the most commonly involved tooth is the maxillary central incisor. Various treatment modalities are available depending upon the clinical, physiological and radiographic status of the involved tooth. The aim of this article was to discuss techniques for the management of complicated crown fractures. SUMMARY Management of complicated crown fractures depends upon several factors with the result that various clinical modalities have been suggested. Seven case reports of complicated crown fractures are presented and risks/benefits of the treatment plans are discussed. KEY LEARNING POINTS Proper diagnosis, treatment planning and follow-up care are important factors in the prognosis of complicated crown fractures. Thorough understanding of the available treatment modalities and their specific indications is critical. The risks and benefits of each treatment option should be carefully evaluated during the treatment planning process.
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Affiliation(s)
- V Aggarwal
- Department of Conservative Dentistry and Endodontics, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India.
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40
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Foster GRK, Downer MC, Lunt M, Aggarwal V, Tickle M. Predictive tool for estimating the potential effect of water fluoridation on dental caries. Community Dent Health 2009; 26:5-11. [PMID: 19385433] [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: 05/27/2023]
Abstract
OBJECTIVE To provide a tool for public health planners to estimate the potential improvement in dental caries in children that might be expected in a region if its water supply were to be fluoridated. BASIC RESEARCH DESIGN Recent BASCD (British Association for the Study of Community Dentistry) dental epidemiological data for caries in 5- and 11-year-old children in English primary care trusts in fluoridated and non-fluoridated areas were analysed to estimate absolute and relative improvement in dmft/DMFT and caries-free measures observed in England. Where data were sufficient for testing significance this analysis included the effect of different levels of deprivation. RESULTS A table of observed improvements was produced, together with an example of how that table can be used as a tool for estimating the expected improvement in caries in any specific region of England. Observed absolute improvements and 95% confidence intervals were: for 5-year-olds reduction in mean dmft 0.56 (0.38, 0.74) for IMD 12, 0.73 (0.60, 0.85) for IMD 20, and 0.94 (0.76, 1.12) for IMD 30, with 12% (9%, 14%) more children free of caries; for 11-year-olds reduction in mean DMFT 0.12 (0.04, 0.20) for IMD 12, 0.19 (0.13, 0.26) for IMD 20, 0.29 (0.18, 0.40) and for IMD 30, with 8% (5%, 11%) more children free from caries. CONCLUSIONS The BASCD data taken together with a deprivation measure are capable of yielding an age-specific, 'intention to treat' model of water fluoridation that can be used to estimate the potential effect on caries levels of a notional new fluoridation scheme in an English region.
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Affiliation(s)
- G R K Foster
- Wirral Primary Care Trust, University of Mancheste, University College London, UK
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41
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Abstract
Tumoral calcinosis is an uncommon and severe complication of hemodialysis therapy. It is generally associated with the presence of the high serum calcium-and-phosphorus product. We report here a case of a patient on hemodialysis who presented with progressively increasing, multiple, tumor-like, subcutaneous swellings. These are rare manifestations of extraosseous calcification in uremic patients that are termed as tumoral calcinosis. A 25 year-old male presented with multiple, nodular, painful, cutaneous swellings all over his body that had been progressively increasing over the last four years. He was a known case of chronic glumerulonephritis who was on regular hemodialysis. The patient was investigated and diagnosed as having tumoral calcinosis and was treated with a low calcium dialysate of pure reverse osmosis water.
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Satija P, Parikh F, Aggarwal V, Sharma B, Hakim A, Pai-Dhungat JV. Indirect hyperbilirubinemia with indinavir. J Assoc Physicians India 2002; 50:1316-7. [PMID: 12568221] [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: 02/28/2023]
Abstract
Indinavir is a protease inhibitor used in the treatment of HIV infected individuals and as post-exposure prophylaxis. Indinavir is associated with various adverse effects including gastrointestinal, a lipodystrophy syndrome and nephrolithiasis. We describe indirect hyperbilirubinemia as an adverse effect of indinavir in a person on post-exposure prophylaxis (PEP).
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Affiliation(s)
- P Satija
- Department of Medicine, TN Medical College and BYL Nair Charitable Hospital, Mumbai
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44
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Singh V, Aggarwal V, Bansal S, Nijhawan S, Chaudhary N. Effect of intraesophageal acid instillation on airway reactivity in patients with asthma. J Assoc Physicians India 2000; 48:601-2. [PMID: 11273538] [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: 02/19/2023]
Abstract
OBJECTIVE To study the change in airway reactivity due to presence of acid in lower esophagus and its reversibility by antacid. METHOD In this double blind study 12 subjects with asthma and gastroesophageal reflux received acid (N/10 hydrochloric acid) and antacid (mixture of magnesium trisilicate and aluminum hydroxide) perfusion in lower esophagus via a nasogastric tube. The four combinations were antacid-antacid (control), antacid-acid, acid-antacid and acid-acid. Airway reactivity (Histamine PD20) was recorded after each perfusion. RESULTS Histamine PD20 significantly decreased (airway reactivity increased) (p < 0.05) with all three combinations containing acid as compared to control. No significant difference in airway reactivity was observed if the antacid was given before or after the acid. CONCLUSION Presence of acid in lower esophagus can increase airway reactivity. This effect lasts longer than the presence of acid in esophagus itself.
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Affiliation(s)
- V Singh
- Pulmonary Medicine Division, SMS Medical College, Jaipur, India
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45
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Rastogi A, Malhotra V, Uppal B, Aggarwal V, Kalra KK, Mittal SK. Aetiology of chronic diarrhoea in tropical children. Trop Gastroenterol 1999; 20:45-9. [PMID: 10464450] [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: 02/13/2023]
Abstract
AIM We studied the causes and presentations of chronic diarrhoea in post-weaned children. METHODS Forty seven children (6 months to 12 years) with diarrhoea of more than 2 weeks duration were recruited and subjected to detailed clinical examination and investigations. RESULTS Primarily on the basis of history, clinical examination and duodenal biopsy, children could be classified into 5 groups namely tropical enteropathy (46.8%), irritable bowel syndrome (10.6%), giardiasis (14.8%), celiac disease (6.8%) and non specific diarrhoea (21.8%). Children with tropical enteropathy improved with broad spectrum antimicrobial therapy, those with irritable bowel syndrome and non specific chronic diarrhoea with dietary interventions while children with celiac disease required definite withdrawal of gluten from diet.
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Affiliation(s)
- A Rastogi
- Maulana Azad Medical College, New Delhi, India
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46
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Dutta AK, Seth A, Goyal PK, Aggarwal V, Mittal SK, Sharma R, Bahl L, Thakur JS, Verma M, Chhatwal J, Chacko B, Saini V, Singhal A, Sharma P, Sharma U, Chaturvedi P, Kumar S, Prajapati NC, Vaidya J, Garg N, Basu SN, Lahiri M, Das CK, Pal DK, Lall SB. Poisoning in children: Indian scenario. Indian J Pediatr 1998; 65:365-70. [PMID: 10771987 DOI: 10.1007/bf02761129] [Citation(s) in RCA: 29] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The retrospective data on childhood poisoning from eight regional hospitals in India has been reviewed. The demographic features and types of poisonings encountered have been compared. The analysis of the data indicated that pediatric poisonings constituted 0.23-3.3% of the total poisoning. The mortality ranged from 0.64-11.6% with highest being from Shimla. Accidental poisoning was common involving 50-90% of children below 5 years of age and males outnumbered the females. Suicidal poisoning was seen after 13 years of age and was due to drugs and household chemicals. One of the hospitals in Delhi recorded a very high incidence (66.6%) of drug poisoning in children. The drugs consumed belonged to phenothiazines, antiepileptics and antipyretics. Iron poisoning was seen in younger children. Kerosene was one of the causes of accidental poisoning at all hospitals except Shimla and rural Maharashtra were probably wood charcoal is widely used. Pesticide poisoning was more prevalent in Punjab and West Bengal whereas plant poisoning was very common in Shimla. Significant number of snake envenomation has been recorded from rural Maharashtra. Other less common accidental poisonings in children included alcohol, corrosives, heavy metals, rodenticides, detergents and disinfectants. Thus various regions in the country showed some variation in types and frequency of childhood poisoning which could be attributed to different geographical and socio-economic background.
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Affiliation(s)
- A K Dutta
- Department of Pediatrics, Kalawati Saran Children's Hospital, New Delhi
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47
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Singh V, Aggarwal V, Bansal S, Garg SP, Chowdhary N. Telephone mouthpiece as a possible source of hospital infection. J Assoc Physicians India 1998; 46:372-3. [PMID: 11273321] [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: 02/19/2023]
Abstract
A bacterial culture from telephone mouthpiece showed that 47 percent of the instruments carried pathogenic bacteria. Wiping with a disinfectant swab reduced the number of contaminated telephones. But for complete elimination of bacterial contamination changes in design of mouthpiece holes or type of instrument or using a polythene plastic cover over mouthpiece is recommended.
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Affiliation(s)
- V Singh
- Department of Medicine, SMS Medical College, Jaipur, India
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48
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49
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Aggarwal V, Prakash C, Yadav S, Chattopadhya D. Prevalence of transfusion associated infections in multitransfused children in relation to mandatory screening of HIV in donated blood. Southeast Asian J Trop Med Public Health 1997; 28:699-706. [PMID: 9656388] [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: 02/08/2023]
Abstract
Any change in risk behavior related to acquisition of human immunodeficiency virus (HIV) infection is likely to reduce simultaneously the risk for other agents transmitted through identical routes. A study carried out in the city of Delhi, India on the load of transfusion associated infections among multitransfused (MT) children in relation to mandatory screening of HIV infection in donated blood indicated unchanged prevalence of hepatitis B virus (HBV), hepatitis C virus (HCV) and hepatitis D virus (HDV) infections among the group of MT children transfused after the implementation of mandatory screening of HIV infections in blood banks, i.e. post-implementation period (prevalence of HBV, HCV and HDV being 32.8%, 31.3% and 1.6% respectively) compared to a group of MT children transfused over a similar duration before the implementation of mandatory screening i.e. pre-implementation period (prevalence of HBV, HCV and HDV being 28.1%, 26.6% and 1.6% respectively). However, reduction could be recorded in the prevalence of IgM and IgG classes of antibodies to both CMV and HSV-2 infections among MT children receiving transfusion during the post-implementation period (prevalence of 3.1% and 37.1% for CMV IgM and CMV IgG respectively; prevalence of 3.1% and 25% for HSV-2 IgM and HSV-2 IgG, respectively) compared to the group of MT children transfused in the pre-implementation period (prevalence of 15.6% and 56.3% for CMV IgM and CMV IgG respectively; prevalence of 18.8% and 45.2% for HSV-2 IgM and HSV-2 IgG, respectively). These reductions were statistically significant (p values < 0.02 and < 0.05 for CMV IgM and CMV IgG; p values < 0.01 and < 0.02 for HSV-2 IgM and HSV-2 IgG respectively). These observations were in accordance with the recorded reduction in the prevalence of CMV and HSV-2 infections and unaltered prevalence of HBV, HCV and HDV infections in the group of donors donating blood during the post-implementation period compared to those donating in the pre-implementation period. Study of epidemiological risk factors among blood donors showed a change in behavior towards safer sex practice with only 13.0% of donors in the post-implementation period having history of sex with one or more female commercial sex workers during their donation periods compared to 41.5% of donors in the pre-implementation period having similar history (p < 0.001). However no change could be recorded in the proportion of donors donating at frequency higher than the permissible guidelines among the two groups. The present study points out nosocomial transmission as well as limitations in the existing guidelines for screening of infectious agents in blood banks as possible incriminating factors towards acquisition of hepatitis virus infections in blood donors as well as in MT children.
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Affiliation(s)
- V Aggarwal
- Department of Pediatrics, Maulana Azad Medical College, Bahadur Shah Zafar Marg, New Delhi, India
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Dangwal TR, Aggarwal V, Malhotra V, Baveja U, Mittal SK. Clinical spectrum of chronic liver disease in north Indian children. Trop Gastroenterol 1997; 18:174-6. [PMID: 9612102] [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: 02/07/2023]
Abstract
Recent advances in serodiagnosis of hepatotropic viruses have revolutionized the approach to diagnosis and understanding of chronic liver disease (CLD). There are few studies on CLD in children from India. The present study was planned to define the clinical spectrum of CLD in children, its histopathology and seroepidemiology. Forty children with clinical features satisfying the criteria for diagnosing chronic liver disease were studied. All underwent routine laboratory investigations, liver function tests and ultrasound scan of the abdomen. Liver biopsy, upper GI endoscopy and other special investigations were done wherever indicated. The most common presenting features were jaundice (70%), fever (67%), and abdominal distention (60%). On examination hepatomegaly and icterus (80% each) and splenomegaly (67%) were the commonest findings. Serum transaminases were raised in 62.5% of children while prothrombin time was prolonged in 75% patients. Oesophageal and/or gastric varices were seen in 13 out of 29 patients subjected to upper GI endoscopy. Hepatitis B surface antigen (HbsAg) was positive in 5 children (12.5%) while 3 (7.5%) tested positive for anti HCV antibody. The commonest histopathological diagnosis was infantile cholangiopathy (20%) followed by cryptogenic cirrhosis and idiopathic chronic active hepatitis (17.5% each). The study suggests that the incidence of chronic hepatitis B and C is rather low in childhood. However larger and longer studies are required to delineate the exact incidence of these conditions in childhood and their progression in adolescence and early adulthood.
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Affiliation(s)
- T R Dangwal
- Department of Paediatrics, Maulana Azad Medical College, New Delhi
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