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Ramanathan K, Klimovich N, Basu Thakur R, Eom BH, Leduc HG, Shu S, Beyer AD, Day PK. Wideband Direct Detection Constraints on Hidden Photon Dark Matter with the QUALIPHIDE Experiment. Phys Rev Lett 2023; 130:231001. [PMID: 37354392 DOI: 10.1103/physrevlett.130.231001] [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: 09/17/2022] [Revised: 03/27/2023] [Accepted: 05/05/2023] [Indexed: 06/26/2023]
Abstract
We report direction detection constraints on the presence of hidden photon dark matter with masses between 20-30 μeV c^{-2}, using a cryogenic emitter-receiver-amplifier spectroscopy setup designed as the first iteration of QUALIPHIDE (quantum limited photons in the dark experiment). A metallic dish sources conversion photons, from hidden photon kinetic mixing, onto a horn antenna which is coupled to a C band kinetic inductance traveling wave parametric amplifier, providing for near quantum-limited noise performance. We demonstrate a first probing of the kinetic mixing parameter χ to the 10^{-12} level for the majority of hidden photon masses in this region. These results not only represent stringent constraints on new dark matter parameter space, but are also the first demonstrated use of wideband quantum-limited amplification for astroparticle applications.
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Affiliation(s)
- K Ramanathan
- Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, California 91125, USA
| | - N Klimovich
- Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, California 91125, USA
| | - R Basu Thakur
- Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, California 91125, USA
| | - B H Eom
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA
| | - H G Leduc
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA
| | - S Shu
- Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, California 91125, USA
| | - A D Beyer
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA
| | - P K Day
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA
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Arnquist I, Avalos N, Baxter D, Bertou X, Castelló-Mor N, Chavarria AE, Cuevas-Zepeda J, Gutiérrez JC, Duarte-Campderros J, Dastgheibi-Fard A, Deligny O, De Dominicis C, Estrada E, Gadola N, Gaïor R, Hossbach T, Iddir L, Khalil L, Kilminster B, Lantero-Barreda A, Lawson I, Lee S, Letessier-Selvon A, Loaiza P, Lopez-Virto A, Matalon A, Munagavalasa S, McGuire KJ, Mitra P, Norcini D, Papadopoulos G, Paul S, Piers A, Privitera P, Ramanathan K, Robmann P, Settimo M, Smida R, Thomas R, Traina M, Vila I, Vilar R, Warot G, Yajur R, Zopounidis JP. First Constraints from DAMIC-M on Sub-GeV Dark-Matter Particles Interacting with Electrons. Phys Rev Lett 2023; 130:171003. [PMID: 37172255 DOI: 10.1103/physrevlett.130.171003] [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: 02/09/2023] [Accepted: 03/21/2023] [Indexed: 05/14/2023]
Abstract
We report constraints on sub-GeV dark matter particles interacting with electrons from the first underground operation of DAMIC-M detectors. The search is performed with an integrated exposure of 85.23 g days, and exploits the subelectron charge resolution and low level of dark current of DAMIC-M charge-coupled devices (CCDs). Dark-matter-induced ionization signals above the detector dark current are searched for in CCD pixels with charge up to 7e^{-}. With this dataset we place limits on dark matter particles of mass between 0.53 and 1000 MeV/c^{2}, excluding unexplored regions of parameter space in the mass ranges [1.6,1000] MeV/c^{2} and [1.5,15.1] MeV/c^{2} for ultralight and heavy mediator interactions, respectively.
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Affiliation(s)
- I Arnquist
- Pacific Northwest National Laboratory (PNNL), Richland, Washington, USA
| | - N Avalos
- Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica (CNEA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Cuyo (UNCUYO), San Carlos de Bariloche 8400, Argentina
| | - D Baxter
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - X Bertou
- Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica (CNEA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Cuyo (UNCUYO), San Carlos de Bariloche 8400, Argentina
| | - N Castelló-Mor
- Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander 39005, Spain
| | - A E Chavarria
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - J Cuevas-Zepeda
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | | | - J Duarte-Campderros
- Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander 39005, Spain
| | - A Dastgheibi-Fard
- LPSC LSM, CNRS/IN2P3, Université Grenoble-Alpes, Grenoble 38026, France
| | - O Deligny
- CNRS/IN2P3, IJCLab, Université Paris-Saclay, Orsay 91405, France
| | - C De Dominicis
- Laboratoire de physique nucléaire et des hautes énergies (LPNHE), Sorbonne Université, Université Paris Cité, CNRS/IN2P3, Paris 75005, France
- SUBATECH, Nantes Université, IMT Atlantique, CNRS-IN2P3, Nantes 44300, France
| | - E Estrada
- Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica (CNEA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Cuyo (UNCUYO), San Carlos de Bariloche 8400, Argentina
| | - N Gadola
- Universität Zürich Physik Institut, Zürich 8057, Switzerland
| | - R Gaïor
- Laboratoire de physique nucléaire et des hautes énergies (LPNHE), Sorbonne Université, Université Paris Cité, CNRS/IN2P3, Paris 75005, France
| | - T Hossbach
- Pacific Northwest National Laboratory (PNNL), Richland, Washington, USA
| | - L Iddir
- Laboratoire de physique nucléaire et des hautes énergies (LPNHE), Sorbonne Université, Université Paris Cité, CNRS/IN2P3, Paris 75005, France
| | - L Khalil
- Laboratoire de physique nucléaire et des hautes énergies (LPNHE), Sorbonne Université, Université Paris Cité, CNRS/IN2P3, Paris 75005, France
| | - B Kilminster
- Universität Zürich Physik Institut, Zürich 8057, Switzerland
| | - A Lantero-Barreda
- Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander 39005, Spain
| | - I Lawson
- SNOLAB, Lively, Ontario P341N2, Canada
| | - S Lee
- Universität Zürich Physik Institut, Zürich 8057, Switzerland
| | - A Letessier-Selvon
- Laboratoire de physique nucléaire et des hautes énergies (LPNHE), Sorbonne Université, Université Paris Cité, CNRS/IN2P3, Paris 75005, France
| | - P Loaiza
- CNRS/IN2P3, IJCLab, Université Paris-Saclay, Orsay 91405, France
| | - A Lopez-Virto
- Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander 39005, Spain
| | - A Matalon
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
- Laboratoire de physique nucléaire et des hautes énergies (LPNHE), Sorbonne Université, Université Paris Cité, CNRS/IN2P3, Paris 75005, France
| | - S Munagavalasa
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - K J McGuire
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - P Mitra
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - D Norcini
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - G Papadopoulos
- Laboratoire de physique nucléaire et des hautes énergies (LPNHE), Sorbonne Université, Université Paris Cité, CNRS/IN2P3, Paris 75005, France
| | - S Paul
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - A Piers
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - P Privitera
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
- Laboratoire de physique nucléaire et des hautes énergies (LPNHE), Sorbonne Université, Université Paris Cité, CNRS/IN2P3, Paris 75005, France
| | - K Ramanathan
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - P Robmann
- Universität Zürich Physik Institut, Zürich 8057, Switzerland
| | - M Settimo
- SUBATECH, Nantes Université, IMT Atlantique, CNRS-IN2P3, Nantes 44300, France
| | - R Smida
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - R Thomas
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - M Traina
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
- Laboratoire de physique nucléaire et des hautes énergies (LPNHE), Sorbonne Université, Université Paris Cité, CNRS/IN2P3, Paris 75005, France
| | - I Vila
- Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander 39005, Spain
| | - R Vilar
- Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander 39005, Spain
| | - G Warot
- LPSC LSM, CNRS/IN2P3, Université Grenoble-Alpes, Grenoble 38026, France
| | - R Yajur
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - J-P Zopounidis
- Laboratoire de physique nucléaire et des hautes énergies (LPNHE), Sorbonne Université, Université Paris Cité, CNRS/IN2P3, Paris 75005, France
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Poon WH, Ling RR, Yang IX, Luo H, Kofidis T, MacLaren G, Tham C, Teoh KLK, Ramanathan K. Dexmedetomidine for adult cardiac surgery: a systematic review, meta-analysis and trial sequential analysis. Anaesthesia 2023; 78:371-380. [PMID: 36535747 DOI: 10.1111/anae.15947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/19/2022] [Indexed: 12/24/2022]
Abstract
The effects of dexmedetomidine in adults undergoing cardiac surgery are inconsistent. We conducted a systematic review and meta-analysis to analyse the effects of peri-operative dexmedetomidine in adults undergoing cardiac surgery. We searched MEDLINE via Pubmed, EMBASE, Scopus and Cochrane for relevant randomised controlled trials between 1 January 1990 and 1 March 2022. We used the Joanna Briggs Institute methodology checklist to assess study quality and the GRADE approach to certainty of evidence. We assessed the sensitivity of results to false data. We used random-effects meta-analyses to analyse the primary outcomes: durations of intensive care and tracheal intubation. We included 48 trials of 6273 participants. Dexmedetomidine reduced the mean (95%CI) duration of intensive care by 5.0 (2.2-7.7) h, p = 0.001, and tracheal intubation by 1.6 (0.6-2.7) h, p = 0.003. The relative risk (95%CI) for postoperative delirium was 0.58 (0.43-0.78), p = 0.001; 0.76 (0.61-0.95) for atrial fibrillation, p = 0.015; and 0.49 (0.25-0.97) for short-term mortality, p = 0.041. Bradycardia and hypotension were not significantly affected. Trial sequential analysis was consistent with the primary meta-analysis. Adjustments for possible false data reduced the mean (95%CI) reduction in duration of intensive care and tracheal intubation by dexmedetomidine to 3.6 (1.8-5.4) h and 0.8 (0.2-1.4) h, respectively. Binary adjustment for methodological quality at a Joanna Briggs Institute score threshold of 10 did not alter the results significantly. In summary, peri-operative dexmedetomidine reduced the durations of intensive care and tracheal intubation and the incidence of short-term mortality after adult cardiac surgery. The reductions in intensive care stay and tracheal intubation may or may not be considered clinically useful, particularly after adjustment for possible false data.
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Affiliation(s)
- W H Poon
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - R R Ling
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - I X Yang
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - H Luo
- Department of Cardiac, Thoracic and Vascular Surgery, National University Hospital, Singapore
| | - T Kofidis
- Department of Cardiac, Thoracic and Vascular Surgery, National University Hospital, Singapore.,Department of Cardiac, Thoracic and Vascular Surgery, National University Hospital, Singapore
| | - G MacLaren
- Department of Cardiac, Thoracic and Vascular Surgery, National University Hospital, Singapore.,Department of Cardiac, Thoracic and Vascular Surgery, National University Hospital, Singapore
| | - C Tham
- Department of Anesthesiology, National University Hospital, Singapore
| | - K L K Teoh
- Department of Cardiac, Thoracic and Vascular Surgery, National University Hospital, Singapore.,Department of Cardiac, Thoracic and Vascular Surgery, National University Hospital, Singapore
| | - K Ramanathan
- Department of Cardiac, Thoracic and Vascular Surgery, National University Hospital, Singapore.,Department of Cardiac, Thoracic and Vascular Surgery, National University Hospital, Singapore
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Ramanathan K, Nair S, Pavithra V, Kumar S, Adoor G, Karjigi U, Shivakumar S. Igg4 Related Disease of Skull Base-A Diagnostic Challenge. Indian J Otolaryngol Head Neck Surg 2022; 74:1057-1060. [PMID: 36452566 PMCID: PMC9702427 DOI: 10.1007/s12070-020-02135-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Accepted: 09/02/2020] [Indexed: 11/25/2022] Open
Abstract
IgG4 related disease (IgG4-RD) is a fibro-inflammatory disease, with tendency to affect any organ of the body. However, few cases affecting the skull base have been reported in literature. We report one such case in an elderly male, who presented us with a mass lesion in the skull base that mimicked nasopharyngeal malignancy. On thorough clinical history, examination, and investigations, IgG4 Related disease was diagnosed and treatment was started for it. The patient responded well to the treatment and is on follow up.
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Affiliation(s)
- Krishna Ramanathan
- Department of ENT-HNS, Apollo Hospitals, Bangalore, 560076 Karnataka India
| | - Satish Nair
- Department of ENT-HNS, Apollo Hospitals, Bangalore, 560076 Karnataka India
| | - V. Pavithra
- Department of ENT-HNS, Apollo Hospitals, Bangalore, 560076 Karnataka India
| | - Savith Kumar
- Department of Interventional Radiology and Neuroradiology, Apollo Hospitals, Bangalore, Karnataka India
| | - Gurucharan Adoor
- Department of Neurology, Apollo Hospitals, Bangalore, Karnataka India
| | - Uma Karjigi
- Department of Rheumatology, Apollo Hospitals, Bangalore, Karnataka India
| | - Swarna Shivakumar
- Department of Pathology, Apollo Hospitals, Bangalore, Karnataka India
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Ramanathan K, Patil AR, Narasimhan S, Nair S. Imaging and Intervention in Internal Carotid Artery Pseudoaneurysm Secondary to Retropharyngeal Abscess. Indian J Otolaryngol Head Neck Surg 2022; 74:2573-2577. [PMID: 36452691 PMCID: PMC9702137 DOI: 10.1007/s12070-020-02283-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 11/10/2020] [Indexed: 10/23/2022] Open
Abstract
Vascular complications secondary to retropharyngeal abscess are rarely encountered in the post antibiotic era and include compression of internal carotid artery (ICA), infective arteritis and pseudoaneurysm formation. Post infectious ICA pseudoaneurysm formation is reported predominantly in the paediatric age group and rare in adults. We report a case of retropharyngeal abscess complicated by ICA pseudoaneurysm in an adult successfully managed by endovascular approach.
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Affiliation(s)
- Krishna Ramanathan
- Department of Head and Neck Surgery, Apollo Hospitals, Bangalore, Karnataka 560078 India
| | - Aruna R. Patil
- Department of Radiology, Apollo Hospitals, Bangalore, Karnataka 560078 India
| | - Sunder Narasimhan
- Department of Vascular Surgery, Apollo Hospitals, Bangalore, Karnataka 560078 India
| | - Satish Nair
- Department of Head and Neck Surgery, Apollo Hospitals, Bangalore, Karnataka 560078 India
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Saini A, Ramanathan K. FMS (Federated Model as a service) for healthcare: an automated secure-framework for personalized recommendation system. CM 2021. [DOI: 10.18137/cardiometry.2021.20.7078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
The Healthcare sector has been emerging on the platform ofdata science. And data scientists are often using machine learningtechniques based on historical data to create models, makepredictions or recommendations. This paper aims to providebackground and information for the community on the benefitsand variants of Federated Learning (F.L.) with other technologiesfor medical applications and highlight key considerationsand challenges of F.L. implementation in the digital health background.With this FMaaS, we envisage a future for digital federatedhealth. We hope to empower and raise awareness aboutthe environment and fog computing to provide a more secureand better-analyzing environment. The AutoML framework isused to generate and optimize machine learning models usingautomatic engineering tools, model selection, and hyperparameteroptimization on fog nodes. Thus, making the systemmore reliable and secure for each individual by preserving privacyat their end devices. And this will lead to a personalizedrecommendation system for each individual associated withthis framework by deploying the Model to their devices foron-device inferences through the concept of differential privateModel averaging. With this framework, users don’t haveto compromise with privacy, and all their sensitive data will besecure on their end devices.
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Hosseini F, Franco C, Selvakumar K, Whalen B, Kaila K, Sellers S, Malhi N, Shahriari M, Lee S, Farkouh M, Verma S, Taylor C, Leipsic J, Ramanathan K. Increased classical monocyte subsets in South Asians compared to White Caucasians at risk for coronary atherosclerosis. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.1090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
South Asians (SA) have an increased prevalence of coronary artery disease (CAD) and myocardial infarction compared with age- and sex-adjusted White Caucasians (WC). The mechanism for this increased risk is poorly understood. While classical CD14++CD16- monocytes act as independent predictors of cardiovascular disease, differences in the distribution of monocyte subsets between SA and WC have not been established.
Purpose
We aimed to determine if differences exist in monocyte subsets between SA and WC at risk for CAD.
Methods
Our cohort consisted of 119 consecutively enrolled patients (59 SA, 60 WC) at intermediate or higher risk for CAD by the INTERHEART score using self-reported history and physical exam. A single blood sample was collected prospectively for the purpose of monocyte analysis. Flow cytometry using dual colour fluorescence (CD14, CD16) within the monocyte gate was used to identify monocyte subsets (classical, intermediate and non-classical) by staff blinded to the individuals' characteristics.
Variables were compared using Mann-Whitney U test and Chi-squared test, as appropriate. Eta coefficient was calculated to analyze the relationship between ethnicity and proportion of monocyte subsets. Eta squared values were calculated to assess the impact of ethnicity on monocyte subset proportions.
Results
The SA group consisted of 64% males with a mean age of 54 (± 9), while the WC group consisted of 55% males with a mean age of 59 (± 7). Both groups had similar body mass index, rates of hypertension, dyslipidemia and family history of premature CAD. Compared to WC, SA had higher prevalence of diabetes (36% vs. 13%, p=0.005) and hemoglobin A1C levels (6.0±1.1% vs. 5.6±0.6%, p<0.001). SA patients had a higher proportion (85.3±10.7% vs. 81.4±11.0%, p=0.009) and total level (449.0±180.4 vs. 388±127.4, p=0.010) of classical CD14++CD16- monocytes compared to WC. There was no difference between the two groups in the proportion of intermediate CD14++CD16+ and non-classical CD14+CD16++ monocytes. There was no association between diabetes and the proportion of monocyte subsets. Ethnicity had a moderate association with the proportion of classical CD14++CD16- monocytes (Eta coefficient = 0.525) with a large effect size (Eta squared = 27.5%). The association of ethnicity with intermediate CD14++CD16+ and non-classical CD14+CD16++ monocytes was either weak or negligible with minimal to no effect size.
Conclusion
In patients with substantive risk for CAD, SA had a significantly higher proportion and level of classical CD14++CD16- monocytes compared to WC. Our findings provide a novel insight into the potential mechanism of increased CAD susceptibility amongst SA compared to WC. Future studies are needed to determine whether these ethnic differences in the distribution of monocyte subsets can predict susceptibility to developing CAD and suffering atherothrombotic events.
Funding Acknowledgement
Type of funding sources: Public Institution(s). Main funding source(s): Cardiology Academic Practice Plan grant at the University of British Columbia
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Affiliation(s)
- F Hosseini
- University of British Columbia, Division of Internal Medicine, Department of Medicine, Vancouver, Canada
| | - C Franco
- University of British Columbia, Division of Cardiology, Department of Medicine, Vancouver, Canada
| | - K Selvakumar
- Providence Health Care Research Institute (PHCRI), Vancouver, Canada
| | - B Whalen
- University of British Columbia, Centre for Heart and Lung Innovation, Vancouver, Canada
| | - K Kaila
- University of British Columbia, Division of Cardiology, Department of Medicine, Vancouver, Canada
| | - S Sellers
- University of British Columbia, Department of Radiology and Centre for Heart Lung Innovation, Vancouver, Canada
| | - N Malhi
- University of British Columbia, Division of Cardiology, Department of Medicine, Vancouver, Canada
| | - M Shahriari
- Tehran University of Medical Sciences, Tehran, Iran (Islamic Republic of)
| | - S Lee
- Yonsei University, Seoul, Korea (Republic of)
| | - M Farkouh
- University of Toronto, University Health Network and Toronto General Hospital, Toronto, Canada
| | - S Verma
- University of Toronto, Division of Cardiac Surgery, St. Michael's Hospital, Toronto, Canada
| | - C Taylor
- University of British Columbia, Division of Cardiology, Department of Medicine, Vancouver, Canada
| | - J Leipsic
- University of British Columbia, Department of Radiology and Centre for Heart Lung Innovation, Vancouver, Canada
| | - K Ramanathan
- University of British Columbia, Division of Cardiology, Department of Medicine, Vancouver, Canada
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Hosseini F, Franco C, Selvakumar K, Whalen B, Kaila K, Sellers S, Malhi N, Shahriari M, Lee S, Alipour S, Khan N, Gupta M, Farkouh M, Verma S, Taylor C, Leipsic J, Ramanathan K. MONOCYTE SUBSETS HETEROGENEITY AND CORONARY ATHEROSCLEROSIS IN SOUTH ASIANS COMPARED TO WHITE CAUCASIANS. Can J Cardiol 2021. [DOI: 10.1016/j.cjca.2021.07.055] [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] Open
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Muthu Kumar T, Ramanathan K. Probiotic Polysaccharides as Toll-Like Receptor 4 Modulators—An In Silico Strategy. Advances in Probiotics 2021:121-133. [DOI: 10.1016/b978-0-12-822909-5.00008-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
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Krishna MR, Sennaiyan UN, Ramanathan K. The utility of patch recorders in neonatal ambulatory electrocardiogram recording. Indian Pacing Electrophysiol J 2020; 21:128-131. [PMID: 33352203 PMCID: PMC7952775 DOI: 10.1016/j.ipej.2020.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 11/30/2020] [Accepted: 12/13/2020] [Indexed: 11/28/2022] Open
Affiliation(s)
- Mani Ram Krishna
- Dr R.K. Hospital for Women and Children, Thanjavur, Tamil Nadu, India.
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Aguilar-Arevalo A, Amidei D, Baxter D, Cancelo G, Vergara BAC, Chavarria AE, D'Olivo JC, Estrada J, Favela-Perez F, Gaïor R, Guardincerri Y, Hoppe EW, Hossbach TW, Kilminster B, Lawson I, Lee SJ, Letessier-Selvon A, Matalon A, Mitra P, Overman CT, Piers A, Privitera P, Ramanathan K, Da Rocha J, Sarkis Y, Settimo M, Smida R, Thomas R, Tiffenberg J, Traina M, Vilar R, Virto AL. Results on Low-Mass Weakly Interacting Massive Particles from an 11 kg d Target Exposure of DAMIC at SNOLAB. Phys Rev Lett 2020; 125:241803. [PMID: 33412014 DOI: 10.1103/physrevlett.125.241803] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2020] [Accepted: 11/04/2020] [Indexed: 06/12/2023]
Abstract
We present constraints on the existence of weakly interacting massive particles (WIMPs) from an 11 kg d target exposure of the DAMIC experiment at the SNOLAB underground laboratory. The observed energy spectrum and spatial distribution of ionization events with electron-equivalent energies >200 eV_{ee} in the DAMIC CCDs are consistent with backgrounds from natural radioactivity. An excess of ionization events is observed above the analysis threshold of 50 eV_{ee}. While the origin of this low-energy excess requires further investigation, our data exclude spin-independent WIMP-nucleon scattering cross sections σ_{χ-n} as low as 3×10^{-41} cm^{2} for WIMPs with masses m_{χ} from 7 to 10 GeV c^{-2}. These results are the strongest constraints from a silicon target on the existence of WIMPs with m_{χ}<9 GeV c^{-2} and are directly relevant to any dark matter interpretation of the excess of nuclear-recoil events observed by the CDMS silicon experiment in 2013.
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Affiliation(s)
| | - D Amidei
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
| | - D Baxter
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - G Cancelo
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | | | - A E Chavarria
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - J C D'Olivo
- Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
| | - J Estrada
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - F Favela-Perez
- Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
| | - R Gaïor
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3, 75005 Paris, France
| | - Y Guardincerri
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - E W Hoppe
- Pacific Northwest National Laboratory (PNNL), Richland, Washington 99354, USA
| | - T W Hossbach
- Pacific Northwest National Laboratory (PNNL), Richland, Washington 99354, USA
| | - B Kilminster
- Universität Zürich Physik Institut, Zurich 8057, Switzerland
| | - I Lawson
- SNOLAB, Lively, Ontario P3Y 1N2, Canada
| | - S J Lee
- Universität Zürich Physik Institut, Zurich 8057, Switzerland
| | - A Letessier-Selvon
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3, 75005 Paris, France
| | - A Matalon
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3, 75005 Paris, France
| | - P Mitra
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - C T Overman
- Pacific Northwest National Laboratory (PNNL), Richland, Washington 99354, USA
| | - A Piers
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - P Privitera
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3, 75005 Paris, France
| | - K Ramanathan
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - J Da Rocha
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3, 75005 Paris, France
| | - Y Sarkis
- Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
| | - M Settimo
- SUBATECH, CNRS-IN2P3, IMT Atlantique, Université de Nantes, Nantes 44300, France
| | - R Smida
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - R Thomas
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - J Tiffenberg
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - M Traina
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3, 75005 Paris, France
| | - R Vilar
- Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander 39005, Spain
| | - A L Virto
- Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander 39005, Spain
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12
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Olson TL, O'Neil ER, Ramanathan K, Lorusso R, MacLaren G, Anders MM. Extracorporeal membrane oxygenation in peripartum cardiomyopathy: A review of the ELSO Registry. Int J Cardiol 2020; 311:71-76. [PMID: 32321653 DOI: 10.1016/j.ijcard.2020.03.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 02/23/2020] [Accepted: 03/02/2020] [Indexed: 10/24/2022]
Abstract
AIMS Data on the use of extracorporeal membrane oxygenation (ECMO) for cardiogenic shock in peripartum cardiomyopathy (PPCM) is limited. We queried the Extracorporeal Life Support Organization (ELSO) Registry for PPCM patients treated with ECMO in order to characterize demographic and clinical features, complications, survival, and variables associated with mortality. METHODS AND RESULTS This was a retrospective review of patients voluntarily entered into the ELSO Registry. De-identified data was collected on patients with a diagnosis of PPCM based on ICD-9/ICD-10 coding who received ECMO between 2007 and 2019. Collected data included demographics, ECMO mode, cannulation strategies, pre-ECMO ventilator, biochemical, and hemodynamic parameters, run duration, complications, and survival to wean off ECMO and hospital discharge. Our primary outcome measure was survival to discharge. In the final analysis, 88 veno-arterial (VA) ECMO patients were included. Overall, 72% of patients were weaned off ECMO, including 10% who were weaned to ventricular assist device or heart transplantation, and 64% survived to hospital discharge. Extracorporeal cardiopulmonary resuscitation (ECPR) was performed in 11% of patients with 60% survival. Factors associated with decreased survival included neurologic complications (p = 0.03), specifically central nervous system hemorrhage (p = 0.01). CONCLUSION Our review is the largest to date of PPCM patients supported with VA ECMO for cardiogenic shock. ECMO and ECPR are valuable forms of short-term mechanical circulatory support with acceptable mortality profiles for PPCM patients who remain refractory to aggressive medical management. Complications should be meticulously avoided, especially neurologic complications.
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Affiliation(s)
- T L Olson
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA.
| | - E R O'Neil
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - K Ramanathan
- Cardiothoracic Intensive Care Unit, National University Hospital, Singapore
| | - R Lorusso
- Cardio-Thoracic Department, Heart and Vascular Centre, Maastricht University Medical Centre, Cardiovascular Research Institute Maastricht (CARIM), Maastricht, the Netherlands
| | - G MacLaren
- Paediatric Intensive Care Unit, Royal Children's Hospital, University of Melbourne, Melbourne, Australia
| | - M M Anders
- Section of Critical Care Medicine, Department of Pediatrics, Baylor College of Medicine, Texas Children's Hospital, Houston, TX, USA
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Ramanathan K, Vijayaraghavan B, Padmanabhan G. SUN-149 ASSESSMENT OF URINARY 1-HYDROXYPYRENE IN PATIENTS WITH CHRONIC KIDNEY DISEASE, WITH REFERENCE TO DIETARY PROTEIN INTAKE. Kidney Int Rep 2020. [DOI: 10.1016/j.ekir.2020.02.678] [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] Open
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14
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James N, Shanthi V, Ramanathan K. Density Functional Theory and Molecular Simulation Studies for Prioritizing Anaplastic Lymphoma Kinase Inhibitors. Appl Biochem Biotechnol 2019; 190:1127-1146. [PMID: 31712989 DOI: 10.1007/s12010-019-03156-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 10/23/2019] [Indexed: 12/12/2022]
Abstract
Targeting anaplastic lymphoma kinase (ALK) is one of the important treatment strategies for the treatment of non-small cell lung cancer (NSCLC). In the present perspective, multidimensional approaches were used for the identification of ALK inhibitors. Initially, an e-pharmacophore model was generated using the PHASE algorithm and was used as a 3D query to screen 468,200 molecules of ASINEX database. Prior to the screening process, the model was evaluated for its significance and the ability to differentiate actives from inactives, using enrichment analysis. Subsequently, the hierarchical docking protocol and binding free energy calculations were instigated using GLIDE algorithm and Prime module, respectively. Further, the pharmacokinetic/pharmacodynamics (PK/PD) properties and toxicities of the hit compounds were envisaged respectively using QikProp program, Osiris explorer, and Protox-II algorithm. These approaches retrieved two hits namely BAS 00137817 and BAS 00680055 with acceptable absorption, distribution, metabolism, excretion and toxicity (ADMET) properties and higher affinity towards ALK protein. Additionally, density functional theory calculations and molecular dynamics simulations were performed to validate the inhibitory activity of the lead compounds. It is noteworthy to mention that all the hits constitute of particular scaffolds which play a major role in the downregulation of some ALK-positive lung cancer pathways. We speculate that the outcomes of this research are of substantial prominence in the rational designing of novel and efficacious ALK inhibitors.
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Affiliation(s)
- Nivya James
- Department of Biotechnology, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore, Tamil Nadu, 632014, India
| | - V Shanthi
- Department of Biotechnology, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore, Tamil Nadu, 632014, India
| | - K Ramanathan
- Department of Biotechnology, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore, Tamil Nadu, 632014, India.
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15
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Aguilar-Arevalo A, Amidei D, Baxter D, Cancelo G, Cervantes Vergara BA, Chavarria AE, Darragh-Ford E, de Mello Neto JRT, D'Olivo JC, Estrada J, Gaïor R, Guardincerri Y, Hossbach TW, Kilminster B, Lawson I, Lee SJ, Letessier-Selvon A, Matalon A, Mello VBB, Mitra P, Molina J, Paul S, Piers A, Privitera P, Ramanathan K, Da Rocha J, Sarkis Y, Settimo M, Smida R, Thomas R, Tiffenberg J, Torres Machado D, Vilar R, Virto AL. Constraints on Light Dark Matter Particles Interacting with Electrons from DAMIC at SNOLAB. Phys Rev Lett 2019; 123:181802. [PMID: 31763884 DOI: 10.1103/physrevlett.123.181802] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 10/03/2019] [Indexed: 06/10/2023]
Abstract
We report direct-detection constraints on light dark matter particles interacting with electrons. The results are based on a method that exploits the extremely low levels of leakage current of the DAMIC detector at SNOLAB of 2-6×10^{-22} A cm^{-2}. We evaluate the charge distribution of pixels that collect <10e^{-} for contributions beyond the leakage current that may be attributed to dark matter interactions. Constraints are placed on so-far unexplored parameter space for dark matter masses between 0.6 and 100 MeV c^{-2}. We also present new constraints on hidden-photon dark matter with masses in the range 1.2-30 eV c^{-2}.
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Affiliation(s)
| | - D Amidei
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
| | - D Baxter
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - G Cancelo
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | | | - A E Chavarria
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - E Darragh-Ford
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - J R T de Mello Neto
- Universidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro 21.941-611, Brazil
| | - J C D'Olivo
- Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - J Estrada
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - R Gaïor
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3 75005, Paris France
| | - Y Guardincerri
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - T W Hossbach
- Pacific Northwest National Laboratory (PNNL), Richland, Washington 99354, USA
| | - B Kilminster
- Universität Zürich Physik Institut, Zurich 8057, Switzerland
| | - I Lawson
- SNOLAB, Lively, Ontario P3Y 1N2, Canada
| | - S J Lee
- Universität Zürich Physik Institut, Zurich 8057, Switzerland
| | - A Letessier-Selvon
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3 75005, Paris France
| | - A Matalon
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3 75005, Paris France
| | - V B B Mello
- Universidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro 21.941-611, Brazil
| | - P Mitra
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - J Molina
- Facultad de Ingeniería, Universidad Nacional de Asunción, Asuncion 2169, Paraguay
| | - S Paul
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - A Piers
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - P Privitera
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3 75005, Paris France
| | - K Ramanathan
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - J Da Rocha
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3 75005, Paris France
| | - Y Sarkis
- Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - M Settimo
- SUBATECH, CNRS-IN2P3, IMT Atlantique, Université de Nantes, Nantes 44300, France
| | - R Smida
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - R Thomas
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - J Tiffenberg
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - D Torres Machado
- Universidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro 21.941-611, Brazil
| | - R Vilar
- Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander 39005, Spain
| | - A L Virto
- Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander 39005, Spain
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Rohini K, Ramanathan K, Shanthi V. Multi-Dimensional Screening Strategy for Drug Repurposing with Statistical Framework—A New Road to Influenza Drug discovery. Cell Biochem Biophys 2019; 77:319-333. [DOI: 10.1007/s12013-019-00887-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2019] [Accepted: 09/16/2019] [Indexed: 12/17/2022]
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17
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Rohini K, Roy R, Ramanathan K, Shanthi V. E-pharmacophore hypothesis strategy to discover potent inhibitor for influenza treatment. J Theor Comput Chem 2019. [DOI: 10.1142/s0219633619500214] [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] [Indexed: 01/10/2023]
Abstract
The surface protein of Influenza virus, Neuraminidase (NA), is believed to play a critical role in the release of new viral particle and thus spreads infection. It has been recognized as a valid drug target for anti-influenza therapy. Despite the number of available approved drugs for the influenza infection treatment, the emergence of resistant variants with novel mutations are the foremost challenges for the currently used NA inhibitors. Thus, the current investigation was carried out to ascertain potent inhibitors using computational strategies such as e-pharmacophore based virtual screening and docking approach. A three-dimensional e-pharmacophore hypothesis was generated based on the chemical features of complexes of the drugs and NA protein using PHASE module of Schrödinger suite. The generated hypothesis consisted of one hydrogen bond acceptor (A), two hydrogen bond donors (D), one negatively charged group (N) and one aromatic ring (R), ADDNR. The hypothesis was further evaluated for its integrity using enrichment analysis and used to filter out molecules with similar pharmacophoric features from approved, investigational and experimental subsets of DrugBank and ZINC database. In addition, ligand filtration was performed to curb down the molecules to an efficient collection of hit molecules by using Lipinski “rule of five and ADME analysis by using Qikprop module. Overall, the results from our analysis suggest that compound lisinopril and formoterol could serve as potent antiviral compounds for the treatment of influenza A virus infection. It is worth mentioning that the results correlate well with literature evidences.
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Affiliation(s)
- K. Rohini
- Department of Biotechnology, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India
| | - Roosha Roy
- Department of Biotechnology, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India
| | - K. Ramanathan
- Department of Biotechnology, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India
| | - V. Shanthi
- Department of Biotechnology, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India
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Ramanathan K, Padmanabhan G, Vijayaraghavan B. SAT-267 CIRCULATORY MICRO RNA EXPRESSION PROFILE FOR CORONARY ARTERY CALCIFICATION IN CHRONIC KIDNEY DISEASE PATIENTS. Kidney Int Rep 2019. [DOI: 10.1016/j.ekir.2019.05.304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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19
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James N, Shanthi V, Ramanathan K. Discovery of novel anaplastic lymphoma kinase inhibitors: Structure and energy-based pharmacophore strategy. J Theor Comput Chem 2019. [DOI: 10.1142/s0219633619500147] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The clinical outcomes in patients with non-small cell lung cancer have improved, as a result of anaplastic lymphoma kinase (ALK) inhibition. Therefore in the current study, substantial effort has been made to identify ALK inhibitors through systematic virtual screening experiment consisting of e-pharmacophore and pharmacophore perception techniques. Initially, a pharmacophore model (AAAHP.193) and an e-pharmacophore model (DDRRR) encompassing the whole dataset of 12 known ALK inhibitors were developed. The hypotheses could retrieve effective compounds from DrugBank database (8621 molecules), which were then subjected to molecular docking and ADME prediction. These approaches resulted in the identification of five hits, namely, nebivolol, HDY, D42, 796, and LZE having higher Glide docking scores and promising ADME properties with augmented CNS involvement. Moreover, molecular dynamics simulations were performed to validate the inhibitory activity of the hit compounds, and density functional theory calculations were carried out to scrutinize the chemical reactivity of the hits. Subsequent interaction and scaffold analysis identified prominent interactions of the hits with ALK kinase domain and scaffolds with anti-tumor activity against lung cancer cell lines. We strongly believe that the study provides an outlook for the sighting of novel and potent ALK inhibitors in the near future.
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Affiliation(s)
- Nivya James
- Department of Biotechnology, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India
| | - V. Shanthi
- Department of Biotechnology, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India
| | - K. Ramanathan
- Department of Biotechnology, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India
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Gateva P, Ramanathan K, Shanthi V, Nivya J, Kamenova K, Angelova V, Tchekalarova J. In silico approaches in the selection of a series of aroylhydrazones bearing melatonin moiety for neuropharmacological testing. Toxicol Lett 2018. [DOI: 10.1016/j.toxlet.2018.06.613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Rohini K, Agarwal P, Preethi B, Shanthi V, Ramanathan K. Exploring the Lead Compounds for Zika Virus NS2B-NS3 Protein: an e-Pharmacophore-Based Approach. Appl Biochem Biotechnol 2018; 187:194-210. [PMID: 29911269 DOI: 10.1007/s12010-018-2814-3] [Citation(s) in RCA: 11] [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: 02/20/2018] [Accepted: 06/05/2018] [Indexed: 12/19/2022]
Abstract
The rapid spread of the Zika virus and its association with the abnormal brain development constitute a global health emergency. With a continuing spread of the mosquito vector, the exposure is expected to accelerate in the coming years. Despite number of efforts, there is still no proper vaccine or medicine to combat this virus. Of note, the NS2B-NS3 protein is proven to be the potential target for the Zika virus therapeutics. Hence, e-pharmacophore-based drug design strategy was employed to identify potent inhibitors of NS2B-NS3 protein from ASINEX database consisting of 467,802 molecules. A 3D e-pharmacophore model was generated using PHASE module of Schrödinger Suite. The generated model consists of one hydrogen bond acceptor (A), two hydrogen bond donors (D), and two aromatic rings (R), ADDRR. The model was further evaluated for its ability to screen actives using enrichment analysis. Subsequently, high-throughput virtual screening protocol was employed, and the resultant hit molecules were also examined for its binding free energies and ADME properties using Prime MM-GBSA and Qikprop module of Schrodinger packages, respectively. Finally, the screened hit molecule was subjected to molecular dynamics simulation to examine its stability. Overall, the results from our analysis suggest that compound BAS 19192837 could be a potent inhibitor for the NS2B-NS3 protein of the Zika virus. It is also noteworthy to mention that our results are in good agreement with literature evidences. We hope that this result is of immense importance in designing potential drug molecules to combat the spread of Zika virus in the near future.
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Affiliation(s)
- K Rohini
- Department of Biotechnology, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore, Tamilnadu, 632014, India
| | - Pratika Agarwal
- Department of Biotechnology, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore, Tamilnadu, 632014, India
| | - B Preethi
- Department of Biotechnology, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore, Tamilnadu, 632014, India
| | - V Shanthi
- Department of Biotechnology, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore, Tamilnadu, 632014, India
| | - K Ramanathan
- Department of Biotechnology, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore, Tamilnadu, 632014, India.
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Yao R, MacGillivray J, Macle L, Bennett M, Hawkins N, Krahn A, Jue J, Colley P, Manhas K, Ramanathan K, Fordyce C, Tsang T, Gin K, Deyell M, Andrade J. REAL-WORLD SAFETY AND EFFICACY OF A ‘PILL-IN-THE-POCKET' APPROACH FOR THE MANAGEMENT OF PAROXYSMAL ATRIAL FIBRILLATION. Can J Cardiol 2017. [DOI: 10.1016/j.cjca.2017.07.371] [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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23
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Cheung C, Wan D, Grunau B, Taylor C, Deyell M, Fordyce C, Wenner J, Kiamanesh O, Kaila K, Christenson J, Farkouh M, Ramanathan K. P2749Is relying on ST depression to help predict coronary artery disease after an out-of-hospital cardiac arrest harming patients? Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.p2749] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Ramanathan K, Verma K, Gupta N, Shanthi V. Discovery of Therapeutic Lead Molecule Against β-Tubulin Using Computational Approach. Interdiscip Sci 2017; 10:734-747. [DOI: 10.1007/s12539-017-0233-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Revised: 03/17/2017] [Accepted: 04/24/2017] [Indexed: 11/30/2022]
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Srividhya M, Hridya H, Shanthi V, Ramanathan K. Bioactive Amento flavone isolated from Cassia fistula L. leaves exhibits therapeutic efficacy. 3 Biotech 2017; 7:33. [PMID: 28401469 PMCID: PMC5388655 DOI: 10.1007/s13205-017-0599-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [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: 10/18/2016] [Accepted: 01/02/2017] [Indexed: 11/28/2022] Open
Abstract
Novel natural compounds endowed with sound bioactivities are currently the utmost need as leads toward drug discovery. For the first time, here, we report the presence of Amentoflavone (biflavonoid) in the leaves of Cassia fistula L. Structural characterization was carried out using ultraviolet–visible spectrophotometer, Fourier transform infrared, nuclear magnetic resonance, and thin-layer chromatography. The isolated compound was further evaluated for its bioactivity. The compound demonstrated moderate cytotoxicity in liver carcinoma (HepG2) cells, and the comparative analysis for the standard and normal compound has also been validated. Antioxidant potential was assessed by DPPH assay. Furthermore, efficacy of the compound in the aforesaid assays asserts its bioactivity and subsequently its importance as a potent therapeutic. Our study strongly suggests that Amentoflavone present in the leaf extracts of C. fistula L. definitely holds promise in the pharmaceutical industry.
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Affiliation(s)
- M Srividhya
- Department of Biotechnology, School of Bio Sciences and Technology, VIT University, Vellore, Tamilnadu, 632014, India
- Karpaga Vinayaga College of Engineering and Technology, Chinnakolambakkam, Kanchipuram Dt, Madhurantagam, India
| | - H Hridya
- Department of Biotechnology, School of Bio Sciences and Technology, VIT University, Vellore, Tamilnadu, 632014, India
| | - V Shanthi
- Department of Biotechnology, School of Bio Sciences and Technology, VIT University, Vellore, Tamilnadu, 632014, India
| | - K Ramanathan
- Department of Biotechnology, School of Bio Sciences and Technology, VIT University, Vellore, Tamilnadu, 632014, India.
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Aguilar-Arevalo A, Amidei D, Bertou X, Butner M, Cancelo G, Castañeda Vázquez A, Cervantes Vergara BA, Chavarria AE, Chavez CR, de Mello Neto JRT, D'Olivo JC, Estrada J, Fernandez Moroni G, Gaïor R, Guardincerri Y, Hernández Torres KP, Izraelevitch F, Kavner A, Kilminster B, Lawson I, Letessier-Selvon A, Liao J, Matalon A, Mello VBB, Molina J, Privitera P, Ramanathan K, Sarkis Y, Schwarz T, Settimo M, Sofo Haro M, Thomas R, Tiffenberg J, Tiouchichine E, Torres Machado D, Trillaud F, You X, Zhou J. First Direct-Detection Constraints on eV-Scale Hidden-Photon Dark Matter with DAMIC at SNOLAB. Phys Rev Lett 2017; 118:141803. [PMID: 28430473 DOI: 10.1103/physrevlett.118.141803] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Indexed: 06/07/2023]
Abstract
We present direct detection constraints on the absorption of hidden-photon dark matter with particle masses in the range 1.2-30 eV c^{-2} with the DAMIC experiment at SNOLAB. Under the assumption that the local dark matter is entirely constituted of hidden photons, the sensitivity to the kinetic mixing parameter κ is competitive with constraints from solar emission, reaching a minimum value of 2.2×10^{-14} at 17 eV c^{-2}. These results are the most stringent direct detection constraints on hidden-photon dark matter in the galactic halo with masses 3-12 eV c^{-2} and the first demonstration of direct experimental sensitivity to ionization signals <12 eV from dark matter interactions.
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Affiliation(s)
| | - D Amidei
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
| | - X Bertou
- Centro Atómico Bariloche, CNEA/CONICET/IB, Bariloche 8400, Argentina
| | - M Butner
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
- Northern Illinois University, DeKalb, Illinois 60115, USA
| | - G Cancelo
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | | | | | - A E Chavarria
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - C R Chavez
- Facultad de Ingeniería, Universidad Nacional de Asunción, Asuncion 2169, Paraguay
| | - J R T de Mello Neto
- Universidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro 21.941-611, Brazil
| | - J C D'Olivo
- Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - J Estrada
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - G Fernandez Moroni
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
- Universidad Nacional del Sur, Bahia Blanca 8000, Argentina
| | - R Gaïor
- Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), Universités Paris 6 et Paris 7, CNRS-IN2P3, F-75005 Paris, France
| | - Y Guardincerri
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | | | - F Izraelevitch
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - A Kavner
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
| | - B Kilminster
- Universität Zürich Physik Institut, Zurich 8057, Switzerland
| | - I Lawson
- SNOLAB, Lively, Ontario P3Y 1N2, Canada
| | - A Letessier-Selvon
- Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), Universités Paris 6 et Paris 7, CNRS-IN2P3, F-75005 Paris, France
| | - J Liao
- Universität Zürich Physik Institut, Zurich 8057, Switzerland
| | - A Matalon
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - V B B Mello
- Universidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro 21.941-611, Brazil
| | - J Molina
- Facultad de Ingeniería, Universidad Nacional de Asunción, Asuncion 2169, Paraguay
| | - P Privitera
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - K Ramanathan
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - Y Sarkis
- Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - T Schwarz
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
| | - M Settimo
- Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), Universités Paris 6 et Paris 7, CNRS-IN2P3, F-75005 Paris, France
| | - M Sofo Haro
- Centro Atómico Bariloche, CNEA/CONICET/IB, Bariloche 8400, Argentina
| | - R Thomas
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - J Tiffenberg
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - E Tiouchichine
- Centro Atómico Bariloche, CNEA/CONICET/IB, Bariloche 8400, Argentina
| | - D Torres Machado
- Universidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro 21.941-611, Brazil
| | - F Trillaud
- Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - X You
- Universidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro 21.941-611, Brazil
| | - J Zhou
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
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Alkhodair A, Tsang M, Ramanathan K, Swiston J, Levy R, Huckell V, Brunner N. COMPARISON OF THERMODILUTION AND INDIRECT FICK CARDIAC OUTPUTS IN PULMONARY ARTERY HYPERTENSION. Can J Cardiol 2016. [DOI: 10.1016/j.cjca.2016.07.091] [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] Open
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28
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Franco C, Taylor C, Sevalkumar K, Cowan S, Heilbron B, Tsang M, Hamburger J, Gosal-Sadhra T, Kaila K, Leipsic J, Ramanathan K. WILL INFLAMMATORY MONOCYTE HETEROGENEITY BE THE KEY TO UNLOCKING THE SECRET OF PREMATURE CORONARY ATHEROSCLEROSIS IN SOUTH ASIANS? A PROSPECTIVE EVALUATION OF CANADIAN SOUTH ASIAN AND CAUCASIANS. Can J Cardiol 2016. [DOI: 10.1016/j.cjca.2016.07.103] [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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Abstract
Crizotinib is an anticancer drug used for the treatment of non-small cell lung cancer. Evidences available suggest that there is a development of an acquired resistance against crizotinib action due to the emergence of several mutations in the ALK gene. It is therefore necessary to develop potent anti-cancer drugs for the treatment of crizotinib resistance non-small cell lung cancer types. In the present study, a novel class of lead molecule was identified using virtual screening, molecular docking and molecular dynamic
approach. The virtual screening analysis was done using PubChem database by employing crizotinib as query and the data reduction was carried out by using molecular docking techniques. The bioavailability of the lead compounds was examined with the help of Lipinski rule of five. The screened lead molecules were analyzed for toxicity profiles, drug-likeness and other physico-chemical properties of drugs by OSIRIS program. Finally, molecular dynamics simulation was also performed to validate the binding property of the lead compound. Our analysis clearly indicates that CID 11562217, a nitrile containing compound (pyrazole-substituted aminoheteroaryl), could be the potential ALK inhibitor certainly helpful to overcome the drug resistance in non-small cell lung cancer.
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Affiliation(s)
- Anish Kumar
- Industrial Biotechnology Division, School of Bio Sciences and Technology, VIT University, Vellore, Tamil Nadu, 632014, India
| | - V Shanthi
- Industrial Biotechnology Division, School of Bio Sciences and Technology, VIT University, Vellore, Tamil Nadu, 632014, India
| | - K Ramanathan
- Industrial Biotechnology Division, School of Bio Sciences and Technology, VIT University, Vellore, Tamil Nadu, 632014, India.
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Verma K, Ramanathan K. Investigation of Paclitaxel Resistant R306C Mutation in β-Tubulin—A Computational Approach. J Cell Biochem 2016; 116:1318-24. [PMID: 25735511 DOI: 10.1002/jcb.25087] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Accepted: 01/16/2015] [Indexed: 11/12/2022]
Abstract
Paclitaxel is the most effective chemotherapeutic agent used for the treatment of a broad spectrum of solid tumors. However, observed paclitaxel resistance in clinical trials presents one of the major obstacles for cancer chemotherapy. Most importantly, resistance due to β-tubulin mutations (R306C) has been intensely debated in recent years. Despite all efforts, mechanism of resistance is still not well understood. In this study, computational techniques were employed to uncover the effect of R306C mutation in the β-tubulin structure and its function. The tools such as I-Mutant, CUPSAT and Fold-X were employed to address the consequence of R306C mutation in the structural stability of β-tubulin. Further, molecular docking and molecular dynamics study was employed to understand the functional impact of β-tubulin mutation. Our results suggest that the R306C mutation causes a significant reduction in the binding affinity between β-tubulin and paclitaxel. Further, docked complex analysis indicates that destruction of conservative hydrogen bond maintained by the residues Arg282 and Gly360 should be responsible for the large conformation changes of the binding pocket in R306C mutant. Finally, molecular dynamics simulations study confirms the stable binding of paclitaxel with native type β-tubulin structure rather than mutant (R306C) type. We certainly believe that this study will provide useful guidance for the development of novel inhibitors that are less susceptible to drug resistance.
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Affiliation(s)
- Kanika Verma
- Industrial Biotechnology Division, School of Bio Sciences and Technology, VIT University, Vellore, 632014, Tamil Nadu, India
| | - K Ramanathan
- Industrial Biotechnology Division, School of Bio Sciences and Technology, VIT University, Vellore, 632014, Tamil Nadu, India
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31
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Nisha J, Ramanathan K, Nawaz Khan F, Dhanasekaran D, Shanthi V. Discovery of a potential lead compound for treating leprosy with dapsone resistance mutation in M. leprae folP1. Mol BioSyst 2016; 12:2178-88. [DOI: 10.1039/c6mb00225k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A potential lead compound to overcome dapsone resistance in M. leprae folP1 was identified by a virtual screening strategy.
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Affiliation(s)
- J. Nisha
- Department of Biotechnology
- School of BioSciences and Technology
- VIT University
- Vellore
- India
| | - K. Ramanathan
- Department of Biotechnology
- School of BioSciences and Technology
- VIT University
- Vellore
- India
| | - F. Nawaz Khan
- Department of Chemistry
- School of Advanced Sciences
- VIT University
- Vellore
- India
| | - D. Dhanasekaran
- Department of Microbiology
- Bharathidasan University
- Tiruchirappalli
- India
| | - V. Shanthi
- Department of Biotechnology
- School of BioSciences and Technology
- VIT University
- Vellore
- India
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32
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Nazzari H, Ramanathan K, Wong G, Taylor C, Deyell M, Grewal J, Tang J, Largy W, Perry-Arnesen M, Toma M. MINERALOCORTICOID RECEPTOR ANTAGONIST UTILIZATION IN ELIGIBLE PATIENTS POST ST-ELEVATION MYOCARDIAL INFARCTION. Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.410] [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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33
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Cheung C, Taylor C, Kaila K, Tang J, Alipour S, Grunau B, Deyell M, Barbic D, Habibi M, Roston T, Ong K, Kiamanesh O, Christenson J, Farkouh M, Ramanathan K. DOES ST DEPRESSION PREDICT CORONARY OCCLUSION AFTER AN OUT-OF-HOSPITAL CARDIAC ARREST? Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.217] [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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34
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MacGillivray J, Bennett M, Colley P, Deyell M, Gin K, Krahn A, Jue J, Manhas K, Ramanathan K, Tsang T, Andrade J. VARIABILITY IN ANTICOAGULATION DOSE ADJUSTMENT BASED ON DIFFERENT RENAL FUNCTION ESTIMATION FORMULAE. Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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35
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Ramanathan K, Abel J, Fung A, Fradet G, Della-Siega A, Wong D, Ding L, Park J, Gao M, Hennessy C, Taylor C, Farkouh M. TRANSLATING CLINICAL TRIAL RESULTS INTO CLINICAL PRACTICE FOR PATIENTS WITH DIABETES AND MULTIVESSEL CORONARY ARTERY DISEASE IN BRITISH COLUMBIA: A POPULATION-BASED STUDY. Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.141] [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: 10/22/2022] Open
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36
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Roston T, Taylor C, Chan S, Potts J, Cloutier-Gill L, Selvakumar K, Cowan S, Cheung C, Franco C, Main T, Verma T, Lee D, Gin K, Ramanathan K. RECURRENT CHEST PAIN IN PATIENTS WITH A HISTORY OF ACUTE CORONARY SYNDROMES: ASSESSING THE GESTALT OF CANADIAN CARDIOLOGISTS. Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.185] [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] Open
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37
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Preethi B, Ramanathan K. Molecular level understanding of resistance to nalidixic acid in Salmonella enteric serovar typhimurium associates with the S83F sequence type. Eur Biophys J 2015; 45:35-44. [PMID: 26329667 DOI: 10.1007/s00249-015-1073-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Revised: 07/15/2015] [Accepted: 08/12/2015] [Indexed: 02/04/2023]
Abstract
Nalidixic acid is an antibiotic drug used for treatment of Salmonellosis, a gastrointestinal infection. DNA gyrase subunit A (GyrA) of Salmonella typhimurium is the drug target for nalidixic acid. Resistance of GyrA to nalidixic acid, because of a point mutation in S. typhimurium, was recently reported. Substitution of Phe in place of Ser at locus 83 in GyrA of S. typhimurium has been experimentally associated with nalidixic acid resistance. Despite recent efforts, the mechanism of this resistance is not well understood. In this investigation we used computational techniques to address this shortcoming. Our results showed that contact with residue Arg 91 is certainly important for efficient binding of nalidixic acid to the target protein, and that mutation of this residue results in 180° rotation of the antibiotic in its binding pocket, around its own long axis. It is hoped these findings may enable development of new antibiotics against resistant forms of Salmonella.
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Affiliation(s)
- B Preethi
- Industrial Biotechnology Division, School of Bio Sciences and Technology, VIT University, Vellore, 632014, Tamil Nadu, India
| | - K Ramanathan
- Industrial Biotechnology Division, School of Bio Sciences and Technology, VIT University, Vellore, 632014, Tamil Nadu, India.
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38
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Preethi B, Shanthi V, Ramanathan K. Investigation of Nalidixic Acid Resistance Mechanism in Salmonella enterica Using Molecular Simulation Techniques. Appl Biochem Biotechnol 2015. [DOI: 10.1007/s12010-015-1760-6] [Citation(s) in RCA: 9] [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] [Indexed: 11/28/2022]
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39
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Abstract
The AKT1 gene is of supreme importance in cell signaling and human cancer. In the present study, we aim to understand the phenotype variations that were believed to have the highest impact in AKT1 gene by different computational approaches. The analysis was initiated with SIFT tool followed by PolyPhen 2.0, I-Mutant 2.0, and SNPs&GO tools with the aid of 22 nonsynonymous (nsSNPs) retrieved from dbSNP. A total of five AKT1 variants such as E17K, E17S, E319G, L357P, and P388T are found to exert deleterious effects on the protein structure and function. Furthermore, the molecular docking study indicates the lesser binding affinity of inhibitor with the mutant structure than the native type. In addition, root mean square deviation and hydrogen bond details were also analyzed in the 10 ns molecular dynamics simulation study. These computational evidences suggested that E17K, E17S, E319G, L357P, and P388T variants of AKT1 could destabilize the protein networks, thus causing functional deviations of protein to some extent. Moreover, the findings strongly indicate that screening for AKT1, E17K, E17S, E319G, L357P, and P388T variants may be useful for disease molecular diagnosis and also to design the potential AKT inhibitors.
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Affiliation(s)
- V Shanthi
- Industrial Biotechnology Division, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore, 632014, Tamil Nadu, India,
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40
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Kumar A, Ramanathan K. Analyzing resistance pattern of non-small cell lung cancer to crizotinib using molecular dynamic approaches. Indian J Biochem Biophys 2015; 52:23-28. [PMID: 26040108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Crizotinib is the potential anticancer drug used for the treatment of non-small cell lung cancer (NSCLC) approved by FDA in 2011. The main target for the crizotinib is anaplastic lymphoma kinase (ALK). Evidences available indicate that double mutant ALK (L1196M and G1269A) confers resistance to crizotinib. However, how mutation confers drug resistance is not well-understood. Hence, in the present study, molecular dynamic (MD) simulation approach was employed to study the impact of crizotinib binding efficacy with ALK structures at a molecular level. Docking results indicated that ALK double mutant (L1196M and G1269A) significantly affected the binding affinity for crizotinib. Furthermore, MD studies revealed that mutant ALK-crizotinib complex showed higher deviation, higher fluctuation and decreased number of intermolecular H-bonds, when compared to the native ALK-crizotinib complex. These results may be immense importance for the molecular level understanding of the crizotinib resistance pattern and also for designing potential drug molecule for the treatment of lung cancer.
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Kumar A, Shanthi V, Ramanathan K. Computational Investigation and Experimental Validation of Crizotinib Resistance Conferred by C1156Y Mutant Anaplastic Lymphoma Kinase. Mol Inform 2015; 34:105-14. [DOI: 10.1002/minf.201400070] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Accepted: 11/04/2014] [Indexed: 12/25/2022]
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42
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Karthick V, Ramanathan K. Insight into the oseltamivir resistance R292K mutation in H5N1 influenza virus: a molecular docking and molecular dynamics approach. Cell Biochem Biophys 2014; 68:291-9. [PMID: 23794010 DOI: 10.1007/s12013-013-9709-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
H5N1 is a subtype of the influenza A virus that can cause disease in humans and many other animal species. Oseltamivir (Tamiflu) is a potent and selective antiviral drug employed to fight the flu virus in infected individuals by inhibiting neuraminidase (NA), a flu protein responsible for the release and spread of the progeny virions. However, oseltamivir resistance has become a critical problem. In particular, influenza strains with a R292K NA mutation are highly resistant to the oseltamivir. Though the biological functions of the mutations have previously been characterized, the structural basis behind the reduced catalytic activity and reduced protein level is not clear. In this study, molecular docking and molecular dynamics (MD) approach were employed to investigate the structural and dynamical effects throughout the protein structure and specifically, at the drug-binding pocket. Furthermore, potential of mean force was analyzed using explicit solvent MD simulations with the umbrella sampling method to explore the free energy of binding. It is believed that this study provides valuable guidance for the resistance management of oseltamivir and designing of more potent antiviral inhibitor.
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Affiliation(s)
- V Karthick
- Bioinformatics Division, School of Bio Sciences and Technology, VIT University, Vellore, 632014, Tamil Nadu, India
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43
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Meredith A, Dai L, Chen V, Seidman M, Hollander Z, Ng R, Wilson-McManus J, Kaan A, Tebbutt S, Ramanathan K, Cheung A, McManus B. CIRCULATING BIOMARKER RESPONSES TO MEDICAL MANAGEMENT VERSUS MECHANICAL CIRCULATORY SUPPORT IN SEVERE INOTROPE-DEPENDENT ACUTE HEART FAILURE. Can J Cardiol 2014. [DOI: 10.1016/j.cjca.2014.07.415] [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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44
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Chou A, Gao M, Park J, Wong G, Taylor C, Ramanathan K. MICROVASCULAR DYSFUNCTION IN PATIENTS WITH ST-ELEVATION MYOCARDIAL INFARCTION AFTER PRIMARY PERCUTANEOUS CORONARY INTERVENTION: NO SEX DISPARITY. Can J Cardiol 2014. [DOI: 10.1016/j.cjca.2014.07.050] [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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45
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Desplantie O, Ramanathan K, Khan N, Daskalopoulou S, Pilote L. CAN APOLIPOPROTEIN B LEVELS PREDICT CARDIOVASCULAR RISK POST ACUTE CORONARY SYNDROME? Can J Cardiol 2014. [DOI: 10.1016/j.cjca.2014.07.054] [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: 11/15/2022] Open
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46
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Fordyce C, Ramanathan K, Park J, Vandegriend R, Cairns J, Perry M, Gao M, Wong G. EVOLUTION OF A REGIONAL STEMI REPERFUSION MODEL: THE 6-YEAR VANCOUVER COASTAL HEALTH AUTHORITY EXPERIENCE. Can J Cardiol 2014. [DOI: 10.1016/j.cjca.2014.07.145] [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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47
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Karthick V, Toropova AP, Toropov AA, Ramanathan K. Discovery of Potential, Non-Toxic Influenza Virus Inhibitor by Computational Techniques. Mol Inform 2014; 33:559-65. [PMID: 27486041 DOI: 10.1002/minf.201400041] [Citation(s) in RCA: 5] [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] [Received: 03/25/2014] [Accepted: 06/19/2014] [Indexed: 11/09/2022]
Abstract
Influenza infection continues to be a major problem in many parts of the world. Rimantadine is a first-line drug used to treat the influenza infection by targeting M2 proton channel. However, S31N mutation in M2 proton channel diminishes the efficiency of rimantadine and creates resistance. To address this issue, the present study was aimed to screen the effective lead candidate against drug resistance strain of influenza from DrugBank database. Initially, the lead molecules were filtered using Lipinski rule of five and the drug likeliness property. Subsequently, the data reduction was carried out by employing molecular docking study. Finally, molecular dynamics simulations techniques were performed to validate the lead compound. Most importantly, the -p LD50 of the screened lead molecule was calculated using CORAL software to estimate the Rat oral toxicity. Accordingly, memantine may possibly become a promising lead compound of rimantadine-resistant influenza virus strain.
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Affiliation(s)
- V Karthick
- Industrial Biotechnology Division, School of Bio Sciences and Technology, VIT University, Vellore, 632014, Tamil Nadu, India tel: +91 9486667687; fax: +91 4162243092
| | - Alla P Toropova
- IRCCS, Istituto di Ricerche Farmacologiche Mario Negri, 20156, Via La Masa 19, Milano, Italy
| | - Andrey A Toropov
- IRCCS, Istituto di Ricerche Farmacologiche Mario Negri, 20156, Via La Masa 19, Milano, Italy
| | - K Ramanathan
- Industrial Biotechnology Division, School of Bio Sciences and Technology, VIT University, Vellore, 632014, Tamil Nadu, India tel: +91 9486667687; fax: +91 4162243092.
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Kumar A, Ramanathan K. Exploring the structural and functional impact of the ALK F1174L mutation using bioinformatics approach. J Mol Model 2014; 20:2324. [PMID: 24952065 DOI: 10.1007/s00894-014-2324-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Accepted: 05/27/2014] [Indexed: 11/30/2022]
Abstract
Crizotinib is the most effective and the only drug that has been approved for the treatment of anaplastic lymphoma kinase (ALK)-positive lung cancer. Reports suggest that there is a development of an acquired resistance against crizotinib action due to the emergence of several mutations in the ALK gene and F1174L is one such mutation. In this study, we used molecular docking and molecular dynamics (MD) approach to decipher the effect of F1174L mutation in drug-target binding. Docking results suggest that crizotinib was found to adopt the most promising conformations to the native-type ALK by identifying the M1199 residue as a prospective partner for making a hydrogen bond as compared to the mutant-type ALK. MD results showed that the average atom, especially atoms of the native-type ALK-crizotinib complex, movements were less, displayed less fluctuation, fast convergence of energy, and changes in geometry. This shows the stable binding of crizotinib with the native-type ALK in comparison to the mutant-type ALK. We believe that this study could be useful for the logical design of stronger, more selective, and more consistent ALK inhibitor against drug-resistant F1174L mutation.
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Affiliation(s)
- Anish Kumar
- Industrial Biotechnology Division, School of Bio Sciences and Technology, VIT University, Vellore, 632014, Tamil Nadu, India
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Shanthi V, Ramanathan K. Identification of potential inhibitor targeting enoyl-acyl carrier protein reductase (InhA) in Mycobacterium tuberculosis: a computational approach. 3 Biotech 2014; 4:253-261. [PMID: 28324429 PMCID: PMC4026456 DOI: 10.1007/s13205-013-0146-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Accepted: 05/25/2013] [Indexed: 11/24/2022] Open
Abstract
The explosive global spreading of multidrug resistant Mycobacterium tuberculosis (Mtb) has provoked an urgent need to discover novel anti-TB agents. Enoyl-acyl carrier protein reductase from Mtb is a well-known and thoroughly studied target for anti-tuberculosis therapy. In the present analysis, virtual screening techniques performed from Drug bank database by utilizing INH-NAD adduct as query for the discovery of potent anti-TB agents. About 100 molecules sharing similar scaffold with INH-NAD adduct were analyzed for their binding effectiveness. The initial screening based on number of rotatable bonds gave 42 hit molecules. Subsequently, physiochemical properties such as toxicity, solubility, drug-likeness and drug score were analyzed for the filtered set of compounds. Final data reduction was performed by means of molecular docking and normal mode docking analysis. The result indicates that DB04362, adenosine diphosphate 5-(beta-ethyl)-4-methyl-thiazole-2-carboxylic acid could be a promising lead compound and be effective in treating sensitive as well as drug-resistant strains of Mtb. We believe that this novel scaffolds might be the good starting point for lead compounds and certainly aid the experimental designing of anti-tuberculosis drug in a short time.
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Affiliation(s)
- V Shanthi
- Industrial Biotechnology Division, School of Bio Sciences and Technology, VIT University, Vellore, 632014, Tamil Nadu, India.
| | - K Ramanathan
- Bioinformatics Division, School of Bio Sciences and Technology, VIT University, Vellore, 632014, Tamil Nadu, India
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Ramanathan K, Platts D, Apte YV, Muthalidas D. An unusual manifestation of Cardiac Sarcoidosis. Sarcoidosis Vasc Diffuse Lung Dis 2014; 31:71-75. [PMID: 24751457] [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] [Received: 08/14/2013] [Revised: 11/13/2013] [Accepted: 11/26/2013] [Indexed: 06/03/2023]
Abstract
Non tropical, non hypereosinophilic endo myocardial fibrosis has been reported in literature and is a rare entity. Cardiac Sarcoidosis manifesting as non-tropical, non hypereosinophilic endomyocardial fibrosis is unknown, though it classically affects the left ventricle and is not associated with specific risk factors. We describe an atypical presentation of sarcoidosis as non-tropical non hypereosinophilic endomyocardial fibrosis in a middle aged female who presented to us with refractory heart failure.
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