1
|
Kritika S, Mahalaxmi S, Srinivasan N, Krithikadatta J. Deciphering the role of Saliva in COVID 19: A global cross-sectional study on the knowledge, awareness and perception among dentists. BMC Oral Health 2023; 23:424. [PMID: 37365550 DOI: 10.1186/s12903-023-03152-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Accepted: 06/20/2023] [Indexed: 06/28/2023] Open
Abstract
OBJECTIVES The global pandemic outbreak of the coronavirus has instilled the quest amongst researchers on the expedited need for the early detection of viral load. Saliva is a complex oral biological fluid which not only causes the disease transmission but can be an effective alternative sample for detection of SARS-CoV2. This provides an ideal opportunity for dentists to be the frontline healthcare professionals who can collect the salivary samples; however the awareness of this amongst dentists is uncertain. Hence the aim of this survey was to evaluate the knowledge, perception and awareness of the role of saliva in detecting the SARS-CoV2 among dentists worldwide. METHODS The online questionnaire comprising of 19 questions was shared to 1100 dentists worldwide and a total of 720 responses was collected. The data was tabulated, statistically analysed using the non- parametric Kruskal-Wallis test (p < 0.05). Based on the principal component analysis, 4 components (knowledge about virus transmission, perception about SARS-CoV2 virus, awareness on the sample collection and knowledge about prevention of the virus) were obtained which was compared with the 3 independent variables (years of clinical experience, occupation and region). RESULTS A statistically significant difference was observed in the awareness quotient amongst the dentists with 0-5 years and greater than 20 years of clinical experience. In terms of the occupation, a significant difference was noted when comparing the postgraduate students to practitioners knowledge about the virus transmission. A highly significant difference was seen on comparing academicians and postgraduate students and also between academicians and practitioners. No significant difference was evidenced amongst the different regions, however the mean score was in the range of 3-3.44. CONCLUSION This survey highlights the deficiency in the knowledge, perception and awareness among dentists worldwide.
Collapse
Affiliation(s)
- Selvakumar Kritika
- Department of Conservative Dentistry and Endodontics, SRM Dental College, Ramapuram, SRM Institute of Science & Technology, Ramapuram Campus, Bharathi Salai, Ramapuram, Chennai, Tamil Nadu, 600089, India.
| | - Sekar Mahalaxmi
- Department of Conservative Dentistry and Endodontics, SRM Dental College, Ramapuram, SRM Institute of Science & Technology, Ramapuram Campus, Bharathi Salai, Ramapuram, Chennai, Tamil Nadu, 600089, India
| | - N Srinivasan
- Specialist Endodontist, Hamad Dental Center, Hamad Medical Corporation, Doha, Qatar
| | - Jogikalmat Krithikadatta
- Department of Cariology and Department of Conservative Dentistry and Endodontics, Saveetha Dental College and Hospitals, Chennai, Tamil Nadu, 600077, India
| |
Collapse
|
2
|
Martinez-Cano D, Ravichandran R, Le H, Wong HE, Jagannathan B, Liu EJ, Bailey W, Yang J, Matthies K, Barkhordarian H, Shah B, Srinivasan N, Zhang J, Hsu A, Wypych J, Stevens J, Piedmonte DM, Miranda LP, Carter L, Murphy M, King NP, Soice N. Process Development of a SARS-CoV-2 Nanoparticle Vaccine. Process Biochem 2023; 129:241-256. [PMID: 37013198 PMCID: PMC10019920 DOI: 10.1016/j.procbio.2023.03.014] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 02/18/2023] [Accepted: 03/12/2023] [Indexed: 03/18/2023]
Abstract
One of the outcomes from the global COVID-19 pandemic caused by SARS-CoV-2 has been an acceleration of development timelines to provide treatments in a timely manner. For example, it has recently been demonstrated that the development of monoclonal antibody therapeutics from vector construction to IND submission can be achieved in five to six months rather than the traditional ten-to-twelve-month timeline using CHO cells [1], [2]. This timeline is predicated on leveraging existing, robust platforms for upstream and downstream processes, analytical methods, and formulation. These platforms also reduce; the requirement for ancillary studies such as cell line stability, or long-term product stability studies. Timeline duration was further reduced by employing a transient cell line for early material supply and using a stable cell pool to manufacture toxicology study materials. The development of non-antibody biologics utilizing traditional biomanufacturing processes in CHO cells within a similar timeline presents additional challenges, such as the lack of platform processes and additional analytical assay development. In this manuscript, we describe the rapid development of a robust and reproducible process for a two-component self-assembling protein nanoparticle vaccine for SARS-CoV-2. Our work has demonstrated a successful academia-industry partnership model that responded to the COVID-19 global pandemic quickly and efficiently and could improve our preparedness for future pandemic threats.
Collapse
|
3
|
Mohan S, Navamani P, Dhanalekshmi KI, Jayamoorthy K, Srinivasan N. NMR spectral, DFT and antibacterial studies of triazole derivatives. INORG NANO-MET CHEM 2023. [DOI: 10.1080/24701556.2023.2166069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- S. Mohan
- Research and Development Center, Bharathiar University, Coimbatore, Tamil Nadu, India
- Department of Chemistry, Rajalakshmi Engineering College, Thandalam, Tamil Nadu, India
| | - P. Navamani
- Research and Development Center, Bharathiar University, Coimbatore, Tamil Nadu, India
- PG Assistant in Chemistry, GGHSS, Kanchipuram, Tamil Nadu, India
| | - K. I. Dhanalekshmi
- Department of Chemistry, Global Institute of Engineering & Technology, Moinabad, R. R. District, Hyderabad, Telgana, India
| | - K. Jayamoorthy
- Department of Chemistry, St. Joseph’s College of Engineering, Chennai, Tamil Nadu, India
| | - N. Srinivasan
- Research and Development Center, Bharathiar University, Coimbatore, Tamil Nadu, India
- Department of Chemistry, Pachaiyappa’s College for Men, Kanchipuram, Tamil Nadu, India
| |
Collapse
|
4
|
Campuzano IDG, Pelegri-O'Day EM, Srinivasan N, Lippens JL, Egea P, Umeda A, Aral J, Zhang T, Laganowsky A, Netirojjanakul C. High-Throughput Mass Spectrometry for Biopharma: A Universal Modality and Target Independent Analytical Method for Accurate Biomolecule Characterization. J Am Soc Mass Spectrom 2022; 33:2191-2198. [PMID: 36206542 DOI: 10.1021/jasms.2c00138] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Reversed-phase liquid chromatographic mass spectrometry (rpLC-MS) is a universal, platformed, and essential analytical technique within pharmaceutical and biopharmaceutical research. Typical rpLC method gradient times can range from 5 to 20 min. As monoclonal antibody (mAb) therapies continue to evolve and bispecific antibodies (BsAbs) become more established, research stage engineering panels will clearly evolve in size. Therefore, high-throughput (HT) MS and automated deconvolution methods are key for success. Additionally, newer therapeutics such as bispecific T-cell engagers and nucleic acid-based modalities will also require MS characterization. Herein, we present a modality and target agnostic HT solid-phase extraction (SPE) MS method that affords the analysis of a 96-well plate in 41.4 min, compared to the traditional rpLC-MS method that would typically take 14.4 h. The described method can accurately determine the molecular weights for monodispersed and highly polydispersed biotherapeutic species and membrane proteins; determine levels of glycosylation, glycation, and formylation; detect levels of chain mispairing; and determine accurate drug-to-antibody ratio values.
Collapse
Affiliation(s)
- Iain D G Campuzano
- Amgen Research, Molecular Analytics, Biologics Therapeutic Discovery, 1 Amgen Center Drive, Thousand Oaks, California91320, United States
| | - Emma M Pelegri-O'Day
- Amgen Research, Molecular Analytics, Biologics Therapeutic Discovery, 1 Amgen Center Drive, Thousand Oaks, California91320, United States
| | - Nithya Srinivasan
- Amgen Research, Molecular Analytics, Biologics Therapeutic Discovery, 1 Amgen Center Drive, Thousand Oaks, California91320, United States
| | - Jennifer L Lippens
- Pivotal Attribute Sciences, Process Development, 1 Amgen Center Drive, Thousand Oaks, California91320, United States
| | - Pascal Egea
- Department of Biological Chemistry, University of California─Los Angeles, Los Angeles, California90095, United States
| | - Aiko Umeda
- Amgen Research, Platform Engineering, Biologics Therapeutic Discovery, 1 Amgen Center Drive, Thousand Oaks, California91320, United States
| | - Jennifer Aral
- Amgen Research, Platform Engineering, Biologics Therapeutic Discovery, 1 Amgen Center Drive, Thousand Oaks, California91320, United States
| | - Tianqi Zhang
- Department of Chemistry, Texas A&M University, College Station, Texas77843, United States
| | - Arthur Laganowsky
- Department of Chemistry, Texas A&M University, College Station, Texas77843, United States
| | - Chawita Netirojjanakul
- Amgen Research, Platform Engineering, Biologics Therapeutic Discovery, 1 Amgen Center Drive, Thousand Oaks, California91320, United States
| |
Collapse
|
5
|
Bangash F, Collinson J, Dungu J, Gedela S, Westwood M, Manisty C, Farwell D, Tan S, Savage H, Vlachos K, Silberbauer J, Calvo J, Hunter R, Schilling R, Srinivasan N. Assessment of optimal thresholds for ventricular scar substrate characterization using the high density grid multipolar mapping catheter. Europace 2022. [DOI: 10.1093/europace/euac053.383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: None.
Background
Voltage thresholds for ventricular scar definition are based on historic data collected using catheters with widely spaced bipoles in the absence of contact force. Modern multipolar mapping catheters employ smaller electrodes and interelectrode spacing that theoretically allows for mapping with increased resolution and reduced far-field electrogram (EGM) component. Despite the advancement in technology, historic cut-offs of <0.5mV for dense scar and 0.5-1.5mV for scar borderzone continue to be used in contemporary electrophysiology.
Purpose
We aimed to assess the optimal voltage cut-offs for ventricular scar substrate characterization using the HD Grid multipolar mapping catheter. Voltage cut-offs were assessed against cardiac MRI derived scar. We compared optimal voltage cut-offs using conventional bipolar sampling, the Best Duplicate Algorithm and with the HD wave solution plus best duplicate algorithm on.
Methods
A multicentre study of twenty patients undergoing VT ablation was conducted. Substrate mapping was performed using the high-density HD-grid multipolar mapping catheter. Bipolar voltage maps were co-registered with cardiac MRI obtained prior to the procedure to assess the voltage characteristics of scar defined by cardiac MRI (CMR) (Figure 1). Pre-procedure contrast enhanced CMR data were analysed using ADAS software (Galgo medical). Data points were collected in regions of scar during (1) HD wave mapping with best duplicate algorithm on(Waveon), (2) Mapping with HD wave off and best duplicate on (Waveoff) and (3) with conventional bipolar mapping (Alloff).
Results
The median bipolar voltage for regions of dense CMR scar using (Waveon) HD wave solution and best duplicate algorithm was 0.27mV (IQR 0.14 – 0.46). The median voltage with (Waveoff) HD wave off was 0.29mV (0.15 – 0.45). The median voltage with (Alloff) HD wave off and best duplicate off was 0.32mV (0.19 – 0.5). ROC analysis using AUC suggested the optimal cut-off for endocardial dense scar using (Waveon) HD wave mapping and best duplicate algorithm was 0.30mV (sensitivity: 69.6%, specificity: 60.74%), (Waveoff) cut-off with the best duplicate and without the HD wave mapping was 0.34mV (sensitivity: 69.78%, specificity: 64.46%) and (Alloff) without wave mapping or best duplication was 0.36mV (sensitivity: 84%, specificity: 52%) Figure 2.
Conclusion
Ventricular substrate characterization with newer mapping technology using narrow electrode spacing and smaller electrode size suggests that traditional voltage cut-offs may need revision for delineation of scar characteristics. Additionally, the ability to repeat sample in a region to obtain the best signal (Best Duplicate), and the ability to obviate the effect of wavefront direction using the HD wave solution omnipolar technology, may further increase the fidelity of scar characterization. This has important implications for mapping VT and characterizing channels in order to identify VT circuits.
Collapse
Affiliation(s)
- F Bangash
- Royal Free London NHS Foundation Trust, Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - J Collinson
- Basildon and Thurrock University Hospitals NHS Foundation Trust, Basildon, United Kingdom of Great Britain & Northern Ireland
| | - J Dungu
- Basildon and Thurrock University Hospitals NHS Foundation Trust, Basildon, United Kingdom of Great Britain & Northern Ireland
| | - S Gedela
- Basildon and Thurrock University Hospitals NHS Foundation Trust, Basildon, United Kingdom of Great Britain & Northern Ireland
| | - M Westwood
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - C Manisty
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - D Farwell
- Basildon and Thurrock University Hospitals NHS Foundation Trust, Basildon, United Kingdom of Great Britain & Northern Ireland
| | - S Tan
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - H Savage
- Basildon and Thurrock University Hospitals NHS Foundation Trust, Basildon, United Kingdom of Great Britain & Northern Ireland
| | - K Vlachos
- Onassis Cardiac Surgery Center, Athens, Greece
| | - J Silberbauer
- Sussex Cardiac Centre, Brighton, United Kingdom of Great Britain & Northern Ireland
| | - J Calvo
- Brighton & Sussex University Hospitals N H S Trust, Brighton, United Kingdom of Great Britain & Northern Ireland
| | - R Hunter
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - R Schilling
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - N Srinivasan
- Anglia Ruskin University, Chelmsford, United Kingdom of Great Britain & Northern Ireland
| |
Collapse
|
6
|
Collinson J, Bangash F, Dungu J, Gedela S, Westwood M, Manisty C, Farwell D, Tan S, Savage H, Vlachos K, Schilling R, Hunter R, Srinivasan N. Integration of structural and functional data in VT ablation -- SENSE2 protocol mapping. Europace 2022. [DOI: 10.1093/europace/euac053.360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: None.
Background
We have previously developed the sense protocol functional substrate mapping technique for VT ablation(1). However, functional substrate characterizaiton can involve protracted mapping time.
Purpose
We incorporated the integration of MRI data using ADAS-3D software into the mapping workflow, to integrate structural mapping information into the functional mapping substrate characterization, in order to improve procedural efficiency.
Methods
CMRs were performed in 20 patients with ischemic related VT and VT therapy in the previous 6 months. These were processed with the ADAS-3D software to characterize the extent of ventricular scars and also ADAS corridors which may correlate with VT channels. Focused substrate maps were then performed in patients, guided by the extent of ADAS scar and corridors, looking at the scar substrate in intrinsic rhythm and then functional channels using single extra pacing from the RV at 20ms above ERP (SENSE2 Protocol). Specifically healthy areas 2cm beyond the scar borderzone based on ADAS were not mapped, in order to reduce substrate mapping time and complete geometries were not created. Following delineation of functional channels pacemapping and entrainment mapping were used to confirm targets for ablation.
The ADAS 3D MRI was integrated into the into the VT substrate map on Ensite-Precision with alignment to the aorta, RV and PA (Figure 1). We compared our data with previous functional mapping data without the integration of MRI.
Results
20 patients (age 70 years; 19 male subjects) underwent ablation. Mean EF 28%. Median procedure time was 161 minutes compared with 246 minutes (in our previous study)(p=<0.001) Mean substrate mapping time was 32 mins vs 63 mins (p=<0.001). Mean ablation time was 22 mins vs 32 mins (p=0.11). 85% (17 of 20) patients were free from symptomatic VT/ anti-tachycardia pacing or implantable cardioverter defibrillator shocks at a median follow-up of 171 days. The mean VT burden was reduced from 22 events per patient in the 6 months’ pre-ablation to 1 event per patient in the median follow up period of 171 days post ablation (p=0.02). Mean shocks per-patient burden decreased from 3.5 to 0.08 in the same time period(p=0.03).
Conclusion
The SENSE2 protocol involves the integration of structural and functional data into the VT workflow for substrate characterization. It enables focused substrate maps to be performed without the need for complete geometry to be created in large ventricles. Outcomes compare favourably with our previous data but with significantly shorter procedure times. This streamlined workflow has the potential to improve care in VT ablation by shortening procedure times with similar outcomes which may reduce risks for the patient.
Figure 1: Comparison of Voltage Map with MRI scar & corridors using ADAS
Collapse
Affiliation(s)
- J Collinson
- Basildon and Thurrock University Hospital, Essex, United Kingdom of Great Britain & Northern Ireland
| | - F Bangash
- Royal Free Hospital, London, United Kingdom of Great Britain & Northern Ireland
| | - J Dungu
- Basildon and Thurrock University Hospital, Essex, United Kingdom of Great Britain & Northern Ireland
| | - S Gedela
- Basildon and Thurrock University Hospital, Essex, United Kingdom of Great Britain & Northern Ireland
| | - M Westwood
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - C Manisty
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - D Farwell
- Basildon and Thurrock University Hospital, Essex, United Kingdom of Great Britain & Northern Ireland
| | - S Tan
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - H Savage
- Basildon and Thurrock University Hospital, Essex, United Kingdom of Great Britain & Northern Ireland
| | - K Vlachos
- Onassis Cardiac Surgery Center, Athens, Greece
| | - R Schilling
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - R Hunter
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - N Srinivasan
- Anglia Ruskin University, Chelmsford, United Kingdom of Great Britain & Northern Ireland
| |
Collapse
|
7
|
Navamani P, Jayamoorthy K, Srinivasan N. Nano SiO 2 catalytic synthesis, NMR spectral studies, photophysical properties and theoretical studies of some styryl imidazole derivatives. INORG NANO-MET CHEM 2022. [DOI: 10.1080/24701556.2022.2070645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- P. Navamani
- Research and Development Center, Bharathiar University, Coimbatore, Tamilnadu, India
- Department of Chemistry, GGHSS, Uthiramerur Kanchipuram, Tamilnadu, India
| | - K. Jayamoorthy
- Department of Chemistry, St.Joseph's College of Engineering, Chennai, Tamilnadu, India
| | - N. Srinivasan
- Department of Chemistry, Pachaiyappa's College for Men, Kanchipuram, Tamilnadu, India
| |
Collapse
|
8
|
Govindarao K, Srinivasan N, Suresh R, Raheja R, Annadurai S, Bhandare RR, Shaik AB. Quinoline conjugated 2-azetidinone derivatives as prospective anti-breast cancer agents: In vitro antiproliferative and anti-EGFR activities, molecular docking and in-silico drug likeliness studies. Journal of Saudi Chemical Society 2022. [DOI: 10.1016/j.jscs.2022.101471] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
9
|
Vigneswaran R, Kumar SRS, Venkatachalam T, Kalaiselvi P, Sattanathan K, Rajaguru R, Srinivasan N. A Review on the Therapeutic Management of COVID-19 Associated with Thrombotic Events and Coagulopathies. JPRI 2022. [DOI: 10.9734/jpri/2022/v34i27b36010] [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: 11/09/2022]
Abstract
Severe acute respiratory syndrome coronavirus two (SARS-CoV-2) is answerable for the coronavirus illness in 2019 (COVID-19) that chop-chop evolved from a virus in metropolis, Varied coagulopathies are rumored in association with COVID-19, together with disseminated intavasular action (DIC) sepsis-induced coagulopathy (SIC), native microthrombi, blood vessel occulation (VTE), blood vessels thrombotic complications and thrombo inflammation. There’s a overplus of publications and conflicting information on hematologic and astringent derangements in COVID-19 with some information suggesting the link to illness progress, severity and/or mortality. There is also growing evidence of potentially usefull clinical biomarkers to predict COVID-19 progression and illness outcomes of these, a link between blood disease and COVID-19 severity or mortality was instructed. During this opinion report, we have a tendency to examine the revealed proof of hematological and astringent laboratory derangements in COVID-19 and also the reticular SARS-CoV-2 evoked inflammation, with a focused discussion on blood platelet count alterations.
Collapse
|
10
|
Srinivasan N, Anbuchezhiyan M, Harish S, Ponnusamy S. Efficient catalytic activity of BiVO 4 nanostructures by crystal facet regulation for environmental remediation. Chemosphere 2022; 289:133097. [PMID: 34861257 DOI: 10.1016/j.chemosphere.2021.133097] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [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: 02/17/2021] [Revised: 11/09/2021] [Accepted: 11/25/2021] [Indexed: 06/13/2023]
Abstract
Controlled growth of BiVO4 nanostructures along (121) and (040) crystal facets plays a crucial role in enhancing their catalytic performance. In this regard, the visible light active photocatalyst BiVO4 was synthesized concerning the effect of pH and surfactants by hydrothermal method. The morphology and size of BiVO4 are strongly dependent on the concentration of H+ and Bi3+ in the reaction system while varying the pH. Further, the significant role of cationic surfactant for obtaining the morphology of the spherical nanoparticles of BiVO4 powders with size 55 nm was analyzed. Adsorption behavior of as-synthesized samples was investigated through Langmuir isotherm model. The catalytic performance of BiVO4 photocatalyst with the degradation efficiency of 98.79% and 15.58% over the methylene blue (MB) and methyl orange (MO) dyes were noticed within 60 min of light irradiation respectively. The enhanced and declined catalytic activity was well correlated with the surface charge of BiVO4 photocatalyst towards the MB and MO dyes respectively. Further, the photocatalytic activity of mixed anionic and cationic dyes was performed. The degradation pathway of MB dye was analyzed by LC-MS for the identification of intermediate products. From the obtained results, the proposed possible photocatalytic mechanism reported.
Collapse
Affiliation(s)
- N Srinivasan
- Department of Physics, Sri Sai Ram Engineering College, Chennai, 600044, Tamil Nadu, India
| | - M Anbuchezhiyan
- Department of Physics, SRM Valliammai Engineering College, Kattankulathur, 603203, Chengalpattu, Tamil Nadu, India.
| | - S Harish
- Functional Materials and Energy Devices Laboratory, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, 603203, Chengalpattu, Tamil Nadu, India.
| | - S Ponnusamy
- Functional Materials and Energy Devices Laboratory, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, 603203, Chengalpattu, Tamil Nadu, India
| |
Collapse
|
11
|
Pachamuthu P, Pricilla Jeyakumari A, Srinivasan N, Chandrasekaran R, Revathi K, Karuppannan P. Structure, surface analysis and bioactivity of Mn doped zinc oxide nanoparticles. J INDIAN CHEM SOC 2022. [DOI: 10.1016/j.jics.2022.100342] [Citation(s) in RCA: 2] [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: 01/29/2023]
|
12
|
Bolin PK, Gosnell SN, Brandel-Ankrapp K, Srinivasan N, Castellanos A, Salas R. Decreased Brain Ventricular Volume in Psychiatric Inpatients with Serotonin Reuptake Inhibitor Treatment. Chronic Stress (Thousand Oaks) 2022; 6:24705470221111092. [PMID: 35859799 PMCID: PMC9290100 DOI: 10.1177/24705470221111092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 06/16/2022] [Indexed: 12/02/2022]
Abstract
Background Brain ventricles have been reported to be enlarged in several neuropsychiatric disorders and in aging. Whether human cerebral ventricular volume can decrease over time with psychiatric treatment is not well-studied. The aim of this study was to examine whether inpatients taking serotonin reuptake inhibitors (SRI) exhibited reductions in cerebral ventricular volume. Methods Psychiatric inpatients, diagnosed mainly with depression, substance use, anxiety, and personality disorders, underwent two imaging sessions (Time 1 and Time 2, approximately 4 weeks apart). FreeSurfer was used to quantify volumetric features of the brain, and ANOVA was used to analyze ventricular volume differences between Time 1 and Time 2. Inpatients' brain ventricle volumes were normalized by dividing by estimated total intracranial volume (eTIV). Clinical features such as depression and anxiety levels were collected at Time 1, Time 1.5 (approximately 2 weeks apart), and Time 2. Results Inpatients consistently taking SRIs (SRI + , n = 44) showed statistically significant reductions of brain ventricular volumes particularly for their left and right lateral ventricular volumes. Reductions in their third ventricular volume were close to significance (p = .068). The inpatients that did not take SRIs (SRI-, n = 25) showed no statistically significant changes in brain ventricular volumes. The SRI + group also exhibited similar brain structural features to the healthy control group based on the 90% confidence interval comparsions on brain ventricular volume parameters, whereas the SRI- group still exhibited relatively enlarged brain ventricular volumes after treatment. Conclusions SRI treatment was associated with decreased brain ventricle volume over treatment.
Collapse
Affiliation(s)
- PK Bolin
- Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston, TX, USA
- Center for Drug Discovery (CDD), Baylor College of Medicine, Houston, TX, USA
- Department of Pharmacology and Chemical Biology, Baylor College of Medicine, Houston, TX, USA
| | - SN Gosnell
- Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston, TX, USA
- Department of Neuroscience, Baylor College of Medicine, Houston, TX, USA
| | - K Brandel-Ankrapp
- Department of Neuroscience, Baylor College of Medicine, Houston, TX, USA
| | | | - A Castellanos
- Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston, TX, USA
- Center for Translational Research on Inflammatory Diseases, Michael E. DeBakey VA Medical Center, Houston, TX, USA
| | - R Salas
- Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston, TX, USA
- Department of Neuroscience, Baylor College of Medicine, Houston, TX, USA
- The Menninger Clinic, Houston, TX, USA
- Center for Translational Research on Inflammatory Diseases, Michael E. DeBakey VA Medical Center, Houston, TX, USA
| |
Collapse
|
13
|
Dhanalekshmi KI, Magesan P, Umapathy MJ, Zhang X, Srinivasan N, Jayamoorthy K. Enhanced photocatalytic and photodynamic activity of chitosan and garlic loaded CdO-TiO 2 hybrid bionanomaterials. Sci Rep 2021; 11:20790. [PMID: 34675259 PMCID: PMC8531292 DOI: 10.1038/s41598-021-00242-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 10/08/2021] [Indexed: 12/02/2022] Open
Abstract
Herein, the work addresses the synthesis of biomaterials (chitosan and garlic) loaded CdO-TiO2 hybrid nanocomposites for photocatalytic water treatment and photodynamic cancer therapeutic applications that were reported the first time. CdO-TiO2 (CT) nanocomposites were synthesized and loaded with the biomaterials such as chitosan and garlic by simple sol-gel method. The nanomaterials were characterized and the photodegradation of three model pollutants, Methylene blue (MB), Methyl orange (MO) and Rhodamine B (Rh-B) was opted to investigate the efficiency of the synthesized photocatalyst under the solar light. From the results, the garlic-loaded CdO-TiO2 (AS-CT) hybrid nanocomposites exhibit a superior photocatalytic activity than the chitosan-loaded CdO-TiO2 (CS-CT) and CdO-TiO2 (CT) nanocomposites under the irradiation of solar light. Additionally, the cell viability of the synthesized nanocomposites was carried out in HeLa cell lines under different concentrations, light doses and incubation periods using an LED light source. Compared to the CS-CT and CT nanocomposites, an efficient photodynamic activity was achieved in the case of AS-CT hybrid nanocomposites. Actually, the end-use properties required for both processes in AS-CT nanocomposites appear similar due to the presence of organo sulphurus compounds.
Collapse
Affiliation(s)
- K. I. Dhanalekshmi
- grid.43555.320000 0000 8841 6246School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100 081 China
| | - P. Magesan
- grid.444347.40000 0004 1796 3866Department of Chemistry, Bharath Institute of Higher Education and Research, Bharath University, Chennai, 600 073 Tamilnadu India
| | - M. J. Umapathy
- grid.252262.30000 0001 0613 6919Department of Chemistry, College of Engineering Guindy, Anna University, Chennai, 600 025 Tamilnadu India
| | - Xiang Zhang
- grid.43555.320000 0000 8841 6246School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100 081 China
| | - N. Srinivasan
- Department of Chemistry, Pachiyappa’s College for Men, Kanchipuram, 631 501 Tamilnadu India
| | - K. Jayamoorthy
- grid.252262.30000 0001 0613 6919Department of Chemistry, St. Joseph’s College of Engineering, Chennai, 600 119 Tamilnadu India
| |
Collapse
|
14
|
Sribala R, Srinivasan N, Rajalaksmi P, Indumathi S, Krishnakumar R. Crystal structure and Hirshfeld surface analysis of a pyrrolo-thia-zine complex. Acta Crystallogr E Crystallogr Commun 2021; 77:770-774. [PMID: 34422298 PMCID: PMC8340966 DOI: 10.1107/s2056989021006642] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Accepted: 06/25/2021] [Indexed: 11/30/2022]
Abstract
In the title compound, diethyl 2,2-dioxo-4-(thio-phen-2-yl)-1-[(thio-phen-2-yl)meth-yl]-3,4,6,7,8,8a-hexa-hydro-1H-pyrrolo-[2,1-c][1,4]thia-zine-1,3-di-carboxyl-ate, C22H28NO6S3, the pyrrolo ring is in an envelope conformation while the thia-zine ring adopts a near chair conformation. The dihedral angles between the thia-zine ring and the methyl-thienyl, thienyl and pyrrolo rings are 64.0 (2), 87.92 (7) and 5.6 (2)°, respectively. In the crystal, the mol-ecules are linked by weak C-H⋯O hydrogen bonds. A Hirshfeld surface analysis was performed to investigate the inter-molecular inter-actions. Disorder of the methyl-thienyl group with site occupancies of 0. 792 (3) and 0.208 (3) is observed.
Collapse
Affiliation(s)
- R. Sribala
- Department of Physics, Thiagarajar College, Madurai - 625 009, India
| | - N. Srinivasan
- Department of Physics, Thiagarajar College, Madurai - 625 009, India
| | - P. Rajalaksmi
- Department of Physics, M.G.R College, Hosur - 635130, India
| | - S. Indumathi
- School of Chemistry, Madurai Kamaraj University, Madurai - 625 021, India
| | - R.V. Krishnakumar
- Department of Physics, Thiagarajar College, Madurai - 625 009, India
| |
Collapse
|
15
|
Girigoswami K, Anon D, Srinivasan N, Girigoswami A. Fate of stem cells grown on the extracellular matrix isolated from cancer cells and their possible applications in tissue engineering. CURR SCI INDIA 2021. [DOI: 10.18520/cs/v120/i10/1616-1622] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
16
|
Rajni Swamy V, Krishnakumar R, Srinivasan N, Sivakumar S, Kumar RR. Coordinated compliance of chloro-methyl and bromo-methyl exchange rule in two dihydrofuran carbonitrile derivatives. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129741] [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]
|
17
|
Patel S, Shannon D, Eldridge W, El-Ters N, Hanford J, Walker T, Scheer A, Jones E, Linwood K, Aragon N, Dunscombe L, Gerbes J, Srinivasan N, Vachharajani A. Understanding umbilical venous catheter insertion practices through a prospective multicenter observational study. J Matern Fetal Neonatal Med 2021; 35:5043-5048. [PMID: 33530795 DOI: 10.1080/14767058.2021.1874908] [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] [Indexed: 10/22/2022]
Abstract
OBJECTIVE To understand practices of umbilical venous catheter (UVC) insertion in tertiary level neonatal intensive care units (NICU) and investigate the outcomes of subsequent attempts following a failed initial attempt. STUDY DESIGN Prospective, multi-center observational study of UVC insertions at tertiary level NICUs between March 2019 and January 2020. RESULTS Of the 101 UVCs inserted at 4 centers, seventy-two (71%) were central at the first attempt and 50% were central at subsequent attempts. Patients with at least 1 failed attempt at insertion were less likely to have a centrally placed UVC (p = .009). Manipulations were less likely to be required when UVC was centrally placed during the first attempt. Maneuvers such as posterior liver mobilization used during insertion were likely to be associated with successful central placement of UVC (p = .0243). The time to complete the procedure was significantly less when the UVC was central at the first attempt (34.2 ± 20.2 vs 46.9 ± 33.8) (p = .0292). Gestational age, birth weight, and age of the baby at the insertion of the UVC, experience of the provider, and type of catheter were comparable among groups. The Shukla formula was most commonly used by providers to measure the depth of UVC placement. CONCLUSION Repetitive attempts and manipulations were less likely to be beneficial in the successful central placement of UVC in neonates. Additionally, repetitive attempts at insertion prolonged the overall duration of the procedure.
Collapse
Affiliation(s)
- S Patel
- Department of Pediatrics, University of Illinois at Chicago, Oak Park, IL, USA
| | - D Shannon
- Department of Child Health, University of Missouri School of Medicine, Columbia, MO, USA
| | - W Eldridge
- Department of Pediatrics, Saint Joseph Women's Hospital, Tampa, FL, USA
| | - N El-Ters
- Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, USA
| | - J Hanford
- Department of Child Health, University of Missouri School of Medicine, Columbia, MO, USA
| | - T Walker
- Department of Child Health, University of Missouri School of Medicine, Columbia, MO, USA
| | - A Scheer
- Department of Child Health, University of Missouri School of Medicine, Columbia, MO, USA
| | - E Jones
- Department of Child Health, University of Missouri School of Medicine, Columbia, MO, USA
| | - K Linwood
- Department of Child Health, University of Missouri School of Medicine, Columbia, MO, USA
| | - N Aragon
- Department of Child Health, University of Missouri School of Medicine, Columbia, MO, USA
| | - L Dunscombe
- Department of Child Health, University of Missouri School of Medicine, Columbia, MO, USA
| | - J Gerbes
- Department of Child Health, University of Missouri School of Medicine, Columbia, MO, USA
| | - N Srinivasan
- Department of Pediatrics, University of Illinois at Chicago, Oak Park, IL, USA
| | - A Vachharajani
- Department of Child Health, University of Missouri School of Medicine, Columbia, MO, USA
| |
Collapse
|
18
|
Subalakshmi A, Kavitha B, Karthika A, Nikhil S, Srinivasan N, Rajarajan M, Suganthi A. Design of Mn and Zr incorporated Ag 2O nanoparticles and their enhanced photocatalytic activity driven by visible light irradiation for degradation of rose bengal dye. NEW J CHEM 2021. [DOI: 10.1039/d0nj04451b] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mn, Zr co-doped Ag2O nanoparticles were blended through a wet chemical strategy, and the physicochemical properties of doped and co-doped silver oxide nanoparticles were characterized.
Collapse
Affiliation(s)
- A. Subalakshmi
- Department of Physics
- C.P.A. College
- Bodinayakanur – 625513
- India
| | - B. Kavitha
- P.G. and Research Department of Chemistry
- C.P.A. College
- Bodinayakanur – 625513
- India
| | - A. Karthika
- P.G. and Research Department of Chemistry
- Thiagarajar College
- Madurai – 625009
- India
| | - S. Nikhil
- School of Chemistry
- Madurai Kamaraj University
- Madurai – 625021
- India
| | - N. Srinivasan
- P.G. and Research Department of Physics
- Thiagarajar College
- Madurai – 625009
- India
| | - M. Rajarajan
- Directorate of Distance Education
- Madurai Kamaraj University
- Madurai – 625009
- India
| | - A. Suganthi
- P.G. and Research Department of Chemistry
- Thiagarajar College
- Madurai – 625009
- India
- Mother Theresa University
| |
Collapse
|
19
|
Srinivasan N, Bishop J, Yekovich R, Rosenfield DB, Helekar SA. Differential Activation and Functional Plasticity of Multimodal Areas Associated with Acquired Musical Skill. Neuroscience 2020; 446:294-303. [PMID: 32818600 DOI: 10.1016/j.neuroscience.2020.08.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 07/27/2020] [Accepted: 08/10/2020] [Indexed: 10/23/2022]
Abstract
Training of a musical skill is known to produce a distributed neural representation of the ability to perceive music and perform musical tasks. In the present study we tested the hypothesis that the audiovisual perception of music involves a wider activation of multimodal sensory and sensorimotor structures in the brain, including those containing mirror neurons. We mapped the activation of brain areas during passive listening and viewing of the first 40 s of "Ode to Joy" being played on the piano by an expert pianist. To do this we performed brain functional magnetic resonance imaging during the presentation of 6 different stimulus contrasts pertaining to that musical melody in a pseudo-randomized order. Group data analysis in musically trained and untrained adults showed robust activation in broadly distributed occipitotemporal, parietal and frontal areas in trained subjects and much restricted activation in untrained subjects. A visual stimulus contrast focusing on the visual motion percept of moving fingers on piano keys revealed selective bilateral activation of a locus corresponding to the V5/MT area, which was significantly more pronounced in trained subjects and showed partial linear dependence on the duration of training on the left side. Quantitative analysis of individual brain volumes confirmed a significantly greater and wider spread of activation in trained compared to untrained subjects. These findings support the view that audiovisual perception of music and musical gestures in trained musicians involves an expanded and widely distributed neural representation formed due to experience-dependent plasticity.
Collapse
Affiliation(s)
- N Srinivasan
- Speech and Language Center, Stanley H. Appel Department of Neurology, Houston Methodist Neurological Institute, Houston, TX, United States
| | - J Bishop
- Speech and Language Center, Stanley H. Appel Department of Neurology, Houston Methodist Neurological Institute, Houston, TX, United States
| | - R Yekovich
- Shepherd School of Music, Rice University, Houston, TX, United States
| | - D B Rosenfield
- Speech and Language Center, Stanley H. Appel Department of Neurology, Houston Methodist Neurological Institute, Houston, TX, United States; Shepherd School of Music, Rice University, Houston, TX, United States
| | - S A Helekar
- Speech and Language Center, Stanley H. Appel Department of Neurology, Houston Methodist Neurological Institute, Houston, TX, United States.
| |
Collapse
|
20
|
Abstract
Epstein Barr Virus (EBV or Human herpesvirus 4) belongs to the genus Lymphocryptoviridae, the gamma 1 subtype of the Subfamily Gamma herpes viridae and is one of the most common viruses in humans. It is present in all populations, infecting more than 95% of all individuals within the first four decades of life. In developing countries, infections occur very early in life with no specific characteristics other than the general symptoms of acute viremia. In developed countries however, the infection is usually delayed until adolescence or early childhood years where it causes infectious mononucleosis, a benign self-limiting lymphoproliferative disorder. Though the infection with EBV is benign in the acute stages and latent in the chronic phase in the vast majority of people, the virus has been demonstrated to be involved in the development of many malignancies with the list of such malignancies progressively increasing. The first association was with the endemic Burkitt’s lymphoma. Subsequently, other lymphomas (subtypes of Hodgkin’s and non-hodgkin’s lymphomas) are also known to be associated with EBV infection. Epithelial malignancies such as lymphoepitheliomas of nasopharynx and stomach are included in the list of EBV associated tumors. Tumors arise as a result of genetic and epigenetic alterations produced by the virus, which transforms the normal cell into an immortalized proliferating cell. Since Burke et al first detected EBV in undifferentiated lymphoepithelioma like gastric cancer in 1990, many researches are undertaken to prove the same. EBV expresses latent membrane protein which can be detected immune histochemically. Our study is aimed at detecting the EBV expression in gastric carcinoma cells.
Collapse
|
21
|
Srinivasan N, Garcia J, Schilling RJ, Ahsan S, Babu G, Ang R, Dhinoja MJ, Hunter RJ, Chow AW, Lambiase PD. 126Dynamic high density functional substrate mapping improves outcomes in ventricular tachycardia ablation. Europace 2020. [DOI: 10.1093/europace/euaa162.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Introduction
Activation and entrainment mapping of VT remains the gold standard for identifying critical sites for ablation of VT, however, this method is limited by poorly tolerated or non-sustained VT. Several substrate guided approaches have been developed, however, outcomes when comparing both methods are similar and overall success can be as low as 47%. A key element in facilitating VT is the presence of dynamic changes within the substrate which may not be evident during sinus rhythm substrate mapping, but may form a critical aspect of the tachycardia mechanism when conduction velocity slows dynamically and tissue refractory periods lengthen. These are rarely studied as part of clinical VT mapping.
Purpose
This study aimed to investigate dynamic substrate changes to local abnormal ventricular activity (LAVA) and late potentials (LP), in relation to critical sites for VT ablation using high resolution mapping of the ventricle with the HD Grid (Abbott, Inc, USA), during short coupled singe extra stimuli from the right ventricle (RV) (Barts Sense Protocol), designed to invoke conduction delay. We hypothesized that the dynamic functional late potential mapping would improve the identification of critical substrate and ablation of these regions would improve outcomes.
Methods
Thirty patients (age 67 +/- 9yrs, 27Male) underwent ablation. Mean ejection fraction was 25% (+/- 10%). Mapping was performed with the AdvisorTM HD Grid multipolar catheter. A bipolar voltage map was obtained during sinus rhythm (SR) and RV Sensed Protocol (SP) single extra pacing. SR and SP late potential (LP) and local abnormal ventricular activity (LAVA) maps were made and compared with critical sites for ablation, defined as sites of best entrainment or pace mapping. Ablation was then performed to critical sites and LP/LAVA identified by the SP.
Results
At a median follow up of 10 months 90% of patients were free from symptomatic ATP or ICD shocks. The median area of late potentials across the 30 patients during sinus rhythm was 6.4mm2 during sinus rhythm mapping and 19.3mm2 during sense protocol pacing (p = 0.001). The functional unmasking of LP and LAVA was seen in 26 patients and showed good correlation to critical regions of the VT circuit (sites of best entrainment or pace map). In 24 patients functionally unmasked late potentials were located within 10mm of critical regions within the mapped VT circuit, with a median distance of 8.5mm, compared to 7 patients during sinus rhythm mapping with a median distance of 22mm (p= <0.001). Figure 1 demonstrates and example of the SP, where increased functional LP are seen along the mapped VT isthmus.
Conclusion
Functional LP and LAVA can be unmasked by the sense protocol enabling better delineation of critical regions for VT ablation which may not be visible during sinus rhythm. This unique delineation of functional substrate changes combined with activation or pacemapping may improve outcomes.
Abstract Figure 1
Collapse
Affiliation(s)
- N Srinivasan
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - J Garcia
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - R J Schilling
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - S Ahsan
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - G Babu
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - R Ang
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - M J Dhinoja
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - R J Hunter
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - A W Chow
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| | - P D Lambiase
- Barts Heart Centre, London, United Kingdom of Great Britain & Northern Ireland
| |
Collapse
|
22
|
Dhanalekshmi KI, Magesan P, Sangeetha K, Zhang X, Jayamoorthy K, Srinivasan N. Preparation and characterization of core-shell type Ag@SiO 2 nanoparticles for photodynamic cancer therapy. Photodiagnosis Photodyn Ther 2019; 28:324-329. [PMID: 31600577 DOI: 10.1016/j.pdpdt.2019.10.006] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 09/16/2019] [Accepted: 10/04/2019] [Indexed: 01/10/2023]
Abstract
With recent scientific developments, Photodynamic therapy (PDT) offers the promisie to become incorporated into the mainstream of cancer therapy. Noble metal based nano-PDT is increasing due to its advantages in the field of biomedicine. In this study, noble metal based Ag@SiO2 core-shell nanoparticles were synthesized and to confirm the core-shell structure they were characterized by UV-vis, XRD, FTIR, TEM, and EDX. Our data confirm that core-shell type Ag@SiO2 nanoparticles maintain its ability to kill cancer cells upon light irradiation. This shows that SiO2 shell may not only prevent aggregation but it also may enhance the photodynamic activity of Ag nanoparticles.
Collapse
Affiliation(s)
- K I Dhanalekshmi
- School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081, China.
| | - P Magesan
- Dept. of Chemistry, Bharath Institute of Higher Education & Research, Bharath University, Chennai, 600 073, Tamil Nadu, India
| | - K Sangeetha
- Dept. of IBT, Bharath Institute of Higher Education & Research, Bharath University, Chennai, 600 073, Tamil Nadu, India
| | - Xiang Zhang
- School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081, China
| | - K Jayamoorthy
- Dept. of Chemistry, St. Joseph's College of Engineering, Chennai, Tamil Nadu, India
| | - N Srinivasan
- Dept. of Chemistry, Pachiyappa's College for Men, Kanchipuram, 631501, Tamil Nadu, India
| |
Collapse
|
23
|
Sribala R, Indhumathi S, Krishnakumar R, Srinivasan N. Crystal structure and molecular Hirshfeld surface analysis of acenaphthene derivatives obeying the chlorine–methyl exchange rule. Acta Crystallogr E Crystallogr Commun 2019; 75:1456-1462. [PMID: 31636975 PMCID: PMC6775734 DOI: 10.1107/s2056989019012428] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 09/06/2019] [Indexed: 11/10/2022]
Abstract
The change of substituents viz. a chlorine atom in (I) replaced by a methyl group in (II) has not induced any differences in their respective crystal packing features, confirming the validity of the chlorine–methyl exchange rule. Instances of crystal structures that remain isomorphous in spite of some minor changes in their respective molecules, such as change in a substituent atom/group, can provide insights into the factors that govern crystal packing. In this context, an accurate description of the crystal structures of an isomorphous pair that differ from each other only by a chlorine–methyl substituent, viz. 5′′-(2-chlorobenzylidene)-4′-(2-chlorophenyl)-1′-methyldispiro[acenaphthene-1,2′-pyrrolidine-3′,3′′-piperidine]-2,4′′-dione, C34H28Cl2N2O2, (I), and its analogue 1′-methyl-5′′-(2-methylbenzylidene)-4′-(2-methylphenyl)dispiro[acenaphthene-1,2′-pyrrolidine-3′,3′′-piperidine]-2,4′′-dione, C36H34N2O2, (II), is presented. While there are two C—H⋯O weak intermolecular interactions present in both (I) and (II), the change of substituent from chlorine to methyl has given rise to an additional weak C—H⋯O intermolecular interaction that is relatively stronger than the other two. However, the presence of the stronger C—H⋯O interaction in (II) has not disrupted the validity of the chloro-methyl exchange rule. Details of the crystal structures and Hirshfeld analyses of the two compounds are presented.
Collapse
|
24
|
Canessane RA, Srinivasan N, Beuria A, Singh A, Kumar BM. Decentralised Applications Using Ethereum Blockchain. 2019 Fifth International Conference on Science Technology Engineering and Mathematics (ICONSTEM) 2019. [DOI: 10.1109/iconstem.2019.8918887] [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]
|
25
|
Pangajavalli S, Ranjithkumar R, Srinivasan N, Ramaswamy S, Selvanayagam S. Crystal structures of 6a,6b,7,11a-tetra-hydro-6 H,9 H-spiro-[chromeno[3',4':3,4]pyrrolo-[1,2- c]thia-zole-11,3'-indoline]-2',6-dione and 5'-methyl-6a,6b,7,11a-tetra-hydro-6 H,9 H-spiro-[chromeno[3',4':3,4]pyrrolo-[1,2- c]thia-zole-11,3'-indoline]-2',6-dione. Acta Crystallogr E Crystallogr Commun 2019; 75:246-250. [PMID: 30800460 PMCID: PMC6362654 DOI: 10.1107/s2056989019000045] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 01/02/2019] [Indexed: 11/11/2022]
Abstract
The title compounds, (I) and (II), differ by the presence of a methyl group in position 5 on the 1H-indole-2-one ring of compound (II). There is also a significant difference in the conformation of the five-membered thiazolidine ring in the two compounds. The title compounds, C20H16N2O3S, (I), and C21H18N2O3S, (II), differ by the presence of a methyl group in position 5 on the 1H-indole-2-one ring of compound (II). The two compounds have a structural overlap r.m.s. deviation of 0.48 Å. There is a significant difference in the conformation of the thiazolidine ring: it has a twisted conformation on the fused N—C bond in (I), but an envelope conformation in compound (II) with the S atom as the flap. The planar pyrrolidine ring of the indole ring system is normal to the mean plane of the five-membered pyrrolidine ring of the pyrrolothiazole unit in both compounds, with dihedral angles of 88.71 (9) and 84.59 (8)°. The pyran rings in both structures have envelope conformations with the methylene C atom adjacent to the C=O group as the flap. In both compounds, there is a short intramolecular C—H⋯O contact present. In the crystal of (I), molecules are linked by C—H⋯O hydrogen bonds forming chains propagating along the b-axis direction. The chains are linked by N—H⋯π interactions, forming layers parallel to (10). In the crystal of (II), molecules are linked by pairs of N—H⋯O hydrogen bonds, forming inversion dimers which are linked by C—H⋯O hydrogen bonds to form a three-dimensional structure.
Collapse
Affiliation(s)
- S Pangajavalli
- Department of Physics, Sri S. Ramasamy Naidu Memorial College, Sattur 626 203, India
| | - R Ranjithkumar
- School of Chemistry, Madurai Kamaraj University, Madurai 625 021, India
| | - N Srinivasan
- Department of Physics, Thiagarajar College, Madurai 625 009, India
| | - S Ramaswamy
- Department of Physics, N. M. S. S. Vellaichamy Nadar College, Madurai 625 019, India
| | - S Selvanayagam
- PG & Research Department of Physics, Government Arts College, Melur 625 106, India
| |
Collapse
|
26
|
Muthuselvi C, Muthu M, Athimoolam S, Ravikumar B, Pandiarajan S, Srinivasan N, Krishnakumar RV. Ethyl 6′-cyano-7′-( p-tolyl)-1′,6′,7′,7a′-tetrahydro-3′ H-spiro[indeno[1,2- b]quinoxaline-11,5′-pyrrolo[1,2- c]thiazole]-6′-carboxylate. IUCr Data 2019. [DOI: 10.1107/s2414314619000105] [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: 11/11/2022] Open
Abstract
The title compound, C31H26N4O2S, crystallizes in a triclinic centrosymmetric lattice with two molecules in the unit cell. The five-membered thiazole and pyrrolidine rings adopt twisted and envelope conformations, respectively. The methoxyphenyl and indenoquinoxaline planes are oriented with a dihedral angle of 88.1 (1)° to each other. The crystal structure features C—H...N, C—H...O and C—H...S intermolecular interactions forming two R
2
2(16) ring motifs and a C(11) and two C
2
2(14) chain motifs. The –CH3 group of the ethyl side chain is disordered over two positions with site occupancies of 0.55 and 0.45.
Collapse
|
27
|
Kalaivani R, Narwani TJ, de Brevern AG, Srinivasan N. Long-range molecular dynamics show that inactive forms of Protein Kinase A are more dynamic than active forms. Protein Sci 2018; 28:543-560. [PMID: 30468265 DOI: 10.1002/pro.3556] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2018] [Revised: 11/11/2018] [Accepted: 11/18/2018] [Indexed: 12/24/2022]
Abstract
Many protein kinases are characterized by at least two structural forms corresponding to the highest level of activity (active) and low or no activity, (inactive). Further, protein dynamics is an important consideration in understanding the molecular and mechanistic basis of enzyme function. In this work, we use protein kinase A (PKA) as the model system and perform microsecond range molecular dynamics (MD) simulations on six variants which differ from one another in terms of active and inactive form, with or without bound ligands, C-terminal tail and phosphorylation at the activation loop. We find that the root mean square fluctuations in the MD simulations are generally higher for the inactive forms than the active forms. This difference is statistically significant. The higher dynamics of inactive states has significant contributions from ATP binding loop, catalytic loop, and αG helix. Simulations with and without C-terminal tail show this differential dynamics as well, with lower dynamics both in the active and inactive forms if C-terminal tail is present. Similarly, the dynamics associated with the inactive form is higher irrespective of the phosphorylation status of Thr 197. A relatively stable stature of active kinases may be better suited for binding of substrates and detachment of the product. Also, phosphoryl group transfer from ATP to the phosphosite on the substrate requires precise transient coordination of chemical entities from three different molecules, which may be facilitated by the higher stability of the active state.
Collapse
Affiliation(s)
- R Kalaivani
- Molecular Biophysics Unit, Indian Institute of Science, Bangalore, 560012, India
| | - T J Narwani
- INSERM, U 1134, DSIMB, F-75739, Paris, France.,Univ Paris Diderot, Sorbonne Paris Cité, UMR_S 1134, F-75739, Paris, France.,Institut National de la Transfusion Sanguine (INTS), F-75739, Paris, France.,Laboratoire d'Excellence GR-Ex, F-75739, Paris, France
| | - A G de Brevern
- INSERM, U 1134, DSIMB, F-75739, Paris, France.,Univ Paris Diderot, Sorbonne Paris Cité, UMR_S 1134, F-75739, Paris, France.,Institut National de la Transfusion Sanguine (INTS), F-75739, Paris, France.,Laboratoire d'Excellence GR-Ex, F-75739, Paris, France
| | - N Srinivasan
- Molecular Biophysics Unit, Indian Institute of Science, Bangalore, 560012, India
| |
Collapse
|
28
|
Muthuselvi C, Athimoolam S, Srinivasan N, Ravikumar B, Pandiarajan S, Krishnakumar RV. Ethyl 6′-cyano-7′-phenyl-1′,6′,7′,7a'-tetrahydro-3′ H-spiro[indeno[1,2- b]quinoxaline-11,5′-pyrrolo[1,2- c]thiazole-6′-carboxylate. IUCr Data 2018. [DOI: 10.1107/s2414314618012865] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
In the title compound, C22H22ClN4O2S, the angle between the mean planes of the indene ring and the quinoxaline ring system is 3.93 (11)°. The five-membered indene and thiazole rings both adopt envelope conformations while the pyrrole ring adopts a twisted conformation. The two acceptor O atoms form a chelated three-centred hydrogen bond with a phenyl C atom.
Collapse
|
29
|
Sribala R, Srinivasan N, Indumathi S, Krishnakumar RV. Isomorphous diethyl 1-(4-chloro-benz-yl)-4-(4-chloro-phen-yl)-2,2-dioxo-3,4,6,7,8,8a-hexa-hydro-1 H-pyrrolo-[2,1- c][1,4]thia-zine-1,3-di-carboxyl-ate and its 1-(4-methyl-benz-yl)-4-(4-methyl-phen-yl)-substituted analogue obeying the chloro-methyl exchange rule. Acta Crystallogr E Crystallogr Commun 2018; 74:1267-1271. [PMID: 30225114 PMCID: PMC6127705 DOI: 10.1107/s2056989018011416] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Accepted: 08/10/2018] [Indexed: 11/30/2022]
Abstract
Accurate studies on the effect of substituents on the crystal packing are essential for understanding the inter-molecular inter-actions and thus paving the way to crystal structure prediction. The crystal structures of diethyl 1-(4-chloro-benz-yl)-4-(4-chloro-phen-yl)-2,2-dioxo-3,4,6,7,8,8a-hexa-hydro-1H-pyrrolo-[2,1-c][1,4]thiazine-1,3-di-carboxyl-ate, C26H29Cl2NO6S, (I), and its isomorphous pair diethyl 1-(4-methyl-benz-yl)-4-(4-methyl-phen-yl)-2,2-dioxo-3,4,6,7,8,8a-hexa-hydro-1H-pyrrolo-[2,1-c][1,4]thia-zine-1,3-di-carboxyl-ate, C28H35NO6S, (II), are described. The mol-ecular aggregation patterns appear to be strikingly similar despite changes in the substituents, with a Cl atom in (I) being replaced by a methyl group in (II). Inspite of the chemical modifications, the structures of (I) and (I) are isomorphous, isostructural and found to obey the chlorine-methyl exchange rule. Both the structures feature C-H⋯O hydrogen bonding. However, a distinguishing feature between (I) and (II) is observed in the conformation of the pyrrole rings where the twist occurs on different C-N bonds. Hirshfeld analysis of both structures is presented and discussed.
Collapse
Affiliation(s)
- R. Sribala
- Department of Physics, Thiagarajar College, Madurai 625 009, India
| | - N. Srinivasan
- Department of Physics, Thiagarajar College, Madurai 625 009, India
| | - S. Indumathi
- School of Chemistry, Madurai Kamaraj University, Madurai 625 021, India
| | | |
Collapse
|
30
|
Dinesh Kumar S, Mohamed Abudhahir K, Selvamurugan N, Vimalraj S, Murugesan R, Srinivasan N, Moorthi A. Formulation and biological actions of nano-bioglass ceramic particles doped with Calcarea phosphorica for bone tissue engineering. Materials Science and Engineering: C 2018; 83:202-209. [DOI: 10.1016/j.msec.2017.08.077] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Revised: 07/24/2017] [Accepted: 08/18/2017] [Indexed: 12/20/2022]
|
31
|
Srinivasan N, Westby J, Horn E, Dolan G, Deam S. F X Nottingham and F X Taunton Two Novel Mutations in Factor X Resulting in Loss of Functional Activity and an Interpretation Using Molecular Modelling. Thromb Haemost 2017. [DOI: 10.1055/s-0037-1615695] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
SummaryWe report two novel mutations in the Factor X gene which result in a bleeding tendency in two unrelated Caucasian families. Although the mutations occur at adjacent codons in exon 8 and result in reduced functional activity with normal antigen levels, the patterns of inheritance appear to be quite distinct. Factor X Nottingham (alanine 404 threonine) appears to be associated with an autosomal recessive pattern of inheritance. In contrast, Factor X Taunton (arginine 405 glycine) results in a mode of inheritance consistent with an autosomal dominant pattern, all five of the heterozygotes in this family being clinically affected. Molecular modelling studies suggest that, in the case of Factor X Nottingham, a drastic conformational change causes major unfolding of the protein. For Factor X Taunton, less extreme conformational changes occur causing loss of functional activity such that substrate binding sites might be maintained. It is proposed that competition with wild type for substrate binding could occur leading to a dominant negative effect.
Collapse
|
32
|
Subhapradha N, Abudhahir M, Aathira A, Srinivasan N, Moorthi A. Polymer coated mesoporous ceramic for drug delivery in bone tissue engineering. Int J Biol Macromol 2017; 110:65-73. [PMID: 29197570 DOI: 10.1016/j.ijbiomac.2017.11.146] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [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: 07/27/2017] [Revised: 10/22/2017] [Accepted: 11/22/2017] [Indexed: 01/10/2023]
Abstract
Treatment strategy for various bone fracture and defects the researchers are focusing to develop a new carrier for delivering the drug into injured area with controlled and sustained manner using biomaterials with dynamic architecture orientation. Ceramic materials are resembled with bone compositional architecture and better bioactivity, degradability as well as antimicrobial activity made its enormous application in bone tissue engineering (BTE). Current focus in regenerative medicine were orchestration of biomaterials with the capacity of loading the drugs, growth factors, ionic components to promote better healing of bone tissue. Mesoporous type materials owed a great look towards the delivery of drugs, growth factors, etc in BTE because of its unique geometry. So the guest molecules loaded with geometrically organized ceramics would deliver onto the site of injury in controlled manner also the guiding and regulation of delivery of molecules have been controlled with the polymers response to different stimulation or biochemical factors as either scaffold or encapsulated particles for bone regeneration. Hence the review aims to describing the recent progress in bone tissue engineering using the ceramic based mesoporous materials encapsulated with polymers respond to different physiochemical stimulation for the efficient and controlled delivery of drug/growth factors for better bone healing.
Collapse
Affiliation(s)
- N Subhapradha
- Faculty of Allied Health Sciences, Chettinad Academy of Research and Education, Chettinad Health City, Kelambakkam, Tamil Nadu, 603 103, India
| | - Mohamed Abudhahir
- Faculty of Allied Health Sciences, Chettinad Academy of Research and Education, Chettinad Health City, Kelambakkam, Tamil Nadu, 603 103, India
| | - A Aathira
- Faculty of Allied Health Sciences, Chettinad Academy of Research and Education, Chettinad Health City, Kelambakkam, Tamil Nadu, 603 103, India
| | - N Srinivasan
- Faculty of Allied Health Sciences, Chettinad Academy of Research and Education, Chettinad Health City, Kelambakkam, Tamil Nadu, 603 103, India
| | - A Moorthi
- Faculty of Allied Health Sciences, Chettinad Academy of Research and Education, Chettinad Health City, Kelambakkam, Tamil Nadu, 603 103, India.
| |
Collapse
|
33
|
Hatti K, Srinivasan N, Murthy MRN. Evaluation of phasing models used for molecular replacement structure determination. Acta Crystallogr A Found Adv 2017. [DOI: 10.1107/s2053273317085710] [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: 11/10/2022] Open
|
34
|
Providencia R, Srinivasan N, Karim N, Honarbakhsh S, Ferreira MJ, Goncalves L, Lambiase PD. P1793Impact of QTc formulae in the prevalence of long corrected QT interval and impact on risk of Long QT Syndrome. Europace 2017. [DOI: 10.1093/ehjci/eux161.102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
35
|
Martin CA, Orini M, Srinivasan N, Bhar-Amato J, Chow A, Lowe MD, Simon RD, Elliott PM, Taggart P, Lambiase PD. P268Novel repolarisation metric predicts arrhythmia origin and clinical events in ARVC and Brugada Syndrome. Europace 2017. [DOI: 10.1093/ehjci/eux171.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
36
|
Bouwmeester S, Verkoeijen PPJL, Aczel B, Barbosa F, Bègue L, Brañas-Garza P, Chmura TGH, Cornelissen G, Døssing FS, Espín AM, Evans AM, Ferreira-Santos F, Fiedler S, Flegr J, Ghaffari M, Glöckner A, Goeschl T, Guo L, Hauser OP, Hernan-Gonzalez R, Herrero A, Horne Z, Houdek P, Johannesson M, Koppel L, Kujal P, Laine T, Lohse J, Martins EC, Mauro C, Mischkowski D, Mukherjee S, Myrseth KOR, Navarro-Martínez D, Neal TMS, Novakova J, Pagà R, Paiva TO, Palfi B, Piovesan M, Rahal RM, Salomon E, Srinivasan N, Srivastava A, Szaszi B, Szollosi A, Thor KØ, Tinghög G, Trueblood JS, Van Bavel JJ, van 't Veer AE, Västfjäll D, Warner M, Wengström E, Wills J, Wollbrant CE. Registered Replication Report: Rand, Greene, and Nowak (2012). Perspect Psychol Sci 2017; 12:527-542. [PMID: 28475467 PMCID: PMC5453400 DOI: 10.1177/1745691617693624] [Citation(s) in RCA: 82] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
In an anonymous 4-person economic game, participants contributed more money to a common project (i.e., cooperated) when required to decide quickly than when forced to delay their decision (Rand, Greene & Nowak, 2012), a pattern consistent with the social heuristics hypothesis proposed by Rand and colleagues. The results of studies using time pressure have been mixed, with some replication attempts observing similar patterns (e.g., Rand et al., 2014) and others observing null effects (e.g., Tinghög et al., 2013; Verkoeijen & Bouwmeester, 2014). This Registered Replication Report (RRR) assessed the size and variability of the effect of time pressure on cooperative decisions by combining 21 separate, preregistered replications of the critical conditions from Study 7 of the original article (Rand et al., 2012). The primary planned analysis used data from all participants who were randomly assigned to conditions and who met the protocol inclusion criteria (an intent-to-treat approach that included the 65.9% of participants in the time-pressure condition and 7.5% in the forced-delay condition who did not adhere to the time constraints), and we observed a difference in contributions of -0.37 percentage points compared with an 8.6 percentage point difference calculated from the original data. Analyzing the data as the original article did, including data only for participants who complied with the time constraints, the RRR observed a 10.37 percentage point difference in contributions compared with a 15.31 percentage point difference in the original study. In combination, the results of the intent-to-treat analysis and the compliant-only analysis are consistent with the presence of selection biases and the absence of a causal effect of time pressure on cooperation.
Collapse
|
37
|
Ayswariya I, Rajalakshmi P, Krishnakumar R, Srinivasan N. 9-Fluoro-2,4,4a,6-tetrahydrospiro[benzo[ c]chromene-3,2′-[1,3]dioxolane]. IUCr Data 2017. [DOI: 10.1107/s2414314617000451] [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: 11/10/2022] Open
Abstract
In the title compound, C15H15FO3, the dihedral angle between the mean plane through all the non-H atoms of the dioxolane ring with those of the rest of the atoms of the chromene ring system, including the substituent F atom, is 81.1 (1)°. The pyran ring has an envelope conformation with the O atom as the flap. The cyclohexene ring has a half-chair conformation, while the dioxolane ring has a twisted conformation on an –O—CH2– bond. In the crystal, molecules are linkedviaC—H...O hydrogen bonds, forming chains along [100]. The chains are linked by C—H...π interactions, involving the fluorobenzene ring, forming layers parallel to theacplane.
Collapse
|
38
|
Chandrarekha M, Srinivasan N, Kottala Vijaya P, Siva A, Krishnakumar RV. Crystal structures of 2'-benzoyl-1'-(4-methyl-phenyl)-1,1',2,2',5',6',7',7a'-octa-hydro-spiro-[indole-3,3'-pyrrolizin]-2-one and 2'-(4-bromo-benzoyl)-1'-(2-chloro-phen-yl)-1,1',2,2',5',6',7',7a'-octa-hydro-spiro-[indole-3,3'-pyrrolizin]-2-one. Acta Crystallogr E Crystallogr Commun 2016; 72:1637-1641. [PMID: 27840725 PMCID: PMC5095850 DOI: 10.1107/s2056989016016741] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Accepted: 10/19/2016] [Indexed: 11/10/2022]
Abstract
The two title compounds, C28H26N2O2, (I), and C27H22BrClN2O2, (II), differ in their substituents, viz.4-methyl-phenyl and benzoyl rings in (I) replaced by 2-chloro-phenyl and 4- bromo-benzoyl, respectively, in (II). A significant difference between the two mol-ecules is found in the deviation of the benzoyl O atom from the least-squares plane of the ring to which it is attached [0.593 (4) and 0.131 (3) Å, respectively], a fact which may be attributed to the different participation of the benzoyl O atoms as acceptors in their inter-molecular C-H⋯O inter-actions. The chemical modifications in (I) and (II) do not seem to affect the type nor strength of the inter-molecular N-H⋯N and C-H⋯O hydrogen bonds responsible for the two crystal structures, such that the aggregation of mol-ecules appears similar in spite of the mol-ecular changes.
Collapse
Affiliation(s)
- M. Chandrarekha
- Department of Physics, Thiagarajar College, Madurai 625 009, Tamil Nadu, India
| | - N. Srinivasan
- Department of Physics, Thiagarajar College, Madurai 625 009, Tamil Nadu, India
| | - P. Kottala Vijaya
- School of Chemistry, Madurai Kamaraj University, Madurai 625 021, Tamil Nadu, India
| | - A. Siva
- School of Chemistry, Madurai Kamaraj University, Madurai 625 021, Tamil Nadu, India
| | - R. V. Krishnakumar
- Department of Physics, Thiagarajar College, Madurai 625 009, Tamil Nadu, India
| |
Collapse
|
39
|
Raine D, Begg G, Moore J, Taylor E, Buck R, Honarbakhsh S, Yew Ding W, Redfearn D, Opel A, Opel A, Thomas D, Prakash K, Thomas D, Khokhar A, Honarbakhsh S, Tairova S, Getman N, McAloon C, Honarbakhsh S, Shah M, Al-Lawati K, Al-Lawati K, Ensam B, Collins G, Akbar S, Merghani A, Furniss G, Yones E, Vijayashankar SS, Vijayashankar SS, Shariat H, Moss A, Yeoh A, Sadiq A, Taylor R, Edwards T, Nizam ud Din K, Langley P, Shepherd E, Murray S, Lord S, Bourke J, Plein S, Lip G, Tayebjee MH, Owen N, White S, O'Neill M, Hughes L, Carroll S, Moss-Morris R, Baker V, Kirkby C, Patel K, Robinson G, Antoniou S, Richmond L, Ullah W, Hunter R, Finlay M, Earley M, Whitbread M, Schilling R, Cooper R, Modi S, Somani R, Ng A, Hobson N, Caldwell J, Hadjivassilev S, Ang R, Finlay M, Dhinoja M, Earley M, Sporton S, Schilling R, Hunter R, Hadjivassilev S, Earley M, Lambiase P, Turley A, Child N, Linker N, Owens W, James S, Milner J, Tayebjee M, Sibley J, Griffiths A, Meredith T, Basher Y, Betts T, Rajappan K, Lambiase P, Lowe M, Hunter R, Schilling R, Finlay M, Rakhimbaeva G, Akramova N, Getman T, Hamborg T, O'Hare J, Randeva H, Osman F, Srinivasan N, Kirkby C, Firman E, Tobin L, Murphy C, Lowe M, Hunter R, Finlay M, Schilling R, Lambiase P, Mohan P, Salahia G, Lim H, Lim HS, Batchvarov V, Brennan P, Cox A, Muir A, Behr E, Hamill S, Laventure C, Newell S, Gordon B, Bashir K, Chuen J, Foster W, Yusuf S, Osman F, Hayat S, Panagopoulos D, Davies E, Tomlinson D, Haywood G, Mullan J, Kelland N, Horwood A, Connell N, Odams S, Maloney J, Shetty A, Kyriacou A, Sahu J, Lee J, Uzun O, Wong A, Ashtekar S, Uzun O, Wong A, Ashtekar S, Hashemi J, Gazor S, Redfearn D, Song A, Jenkins J, Glancy J, Wilson D, Sammut E, Diab I, Cripps T, Gill A, Abbas S, Enye J, Wahab A, Elshafie S, Ling K, Carey P, Chatterjee D, Timbrell S, Tufail W, Why H, Martos R, Thornley A, James S, Turley A, Bates M, Linker N, Hassan E, Quick J, Cowell R, Ho E. POSTERS (1)59MULTIPOLAR CONTACT MAPPING GUIDED ABLATION OF TEMPORALLY STABLE HIGH FREQUENCY AND COMPLEX FRACTIONATED ATRIAL ELECTROGRAM SITES IN PATIENTS WITH PERSISTENT ATRIAL FIBRILLATION60INTRA-CARDIAC AND PERIPHERAL LEVELS OF BIOCHEMICAL MARKERS OF FIBROSES IN PATIENTS UNDERGOING CATHETER ABLATION FOR ATRIAL FIBRILATION61THE DON'T WAIT TO ANTICOAGULATE PROJECT (DWAC) BY THE WEST OF ENGLAND ACADEMIC HEALTH SCIENCE NETWORK (AHSN) OPTIMISES STROKE PREVENTION FOR PATIENTS WITH ATRIAL FIBRILLATION (AF) WITHIN PRIMARY CARE IN LINE WITH NICE CG180 IN THE WEST OF ENGLAND62ILLNESS AND TREATMENT REPRESENTATIONS, COPING AND DISTRESS: VICIOUS CYCLES OF EVERYDAY EXPERIENCES IN PATIENTS WITH PERSISTENT ATRIAL FIBRILLATION63THE NEEDS OF THE ADOLESCENT LIVING WITH AN INHERITED CARDIAC CONDITION: THE PATIENTS' PERSPECTIVE64SAFETY AND EFFICACY OF PARAMEDIC TREATMENT OF REGULAR SUPRAVENTRICULAR TACHYCARDIA (PARA-SVT)65NATURAL PROGRESSION OF QRS DURATION FOLLOWING IMPLATABLE CARDIOVERTER DEFIBRILLATORS (ICD) - IMPLANTATION66COMPARISON OF EFFICACY OF VOLTAGE DIRECTED CAVOTRICUSPID ISTHMUS ABLATION USING MINI VS CONVENTIONAL ELETRODES67CRYOBALLOON ABLATION (CRYO) FOR ATRIAL FIBRILLATION (AF) CANNOT BE GUIDED BY TEMPERATURE END-POINTS ALONE68MODERATOR BAND ECTOPY UNMASKED BY ADENOSINE AS A CAUSE OF ECTOPIC TRIGGERED IDIOPATHIC VF69EARLY CLINICAL EXPERIENCE WITH TARGETED SITE SELECTION FOR THE WiCS-LV ELECTRODE FOR CRT70DOES VECTOR MAPPING PRIOR TO IMPLANTABLE LOOP RECORDER INSERTION IMPROVE THE DETECTION OF ARRHYTHMIA?71THE ROLE OF SPECKLE TRACKING STRAIN IMAGING IN ASSESSING LEFT VENTRICULAR RESPONSE TO CARDIAC RESYNCHRONISATION THERAPY IN RESPONDERS AND NON-RESPONDERS72EVALUATING PATIENTS' EXPERIENCE AND SATISFACTION OF THE ATRIAL FIBRILLATION ABLATION PROCEDURE: A RETROSPECTIVE ANALYSIS73TROUBLESHOOTING LV LEAD IMPLANTATION - NOVEL “UNIRAIL TECHNIQUE”74SUBCLINICAL ATHEROSCELEROSIS AND COGNITIVE IMPAIRMENT75EFFECT OF LOZARTANE ON DEVELOPMENT OF THE ELECTRICAL INSTABILITY OF THE MYOCARDIUM76THE INTERPLAY BETWEEN BODY COMPOSITION AND LEFT VENTRICULAR REMODELLING IN CARDIAC RESYNCHRONISATION THERAPY77FAMILY SCREENING IN IDIOPATHIC VENTRICULAR FIBRILLATION78MANAGEMENT OF ATRIAL FIBRILLATION IN A LARGE TEACHING HOSPITAL79THE EFFECT OF LEFT VENTRICULAR LEAD POSITION ON SURVIVAL IN PATIENTS WITH BINVENTRICULAR PACEMAKRS/DEFIBRILLATORS80ACUTE DEVICE IMPLANT-RELATED COMPLICATIONS DO NOT INCREASE LATE MORTALITY81ABORTED CARIDAC ARREST AS THE SENTINEL PRESENTATION IN A COHORT OF PATIENTS WITH THE CONCEALED BRUGADA PHENOTYPE82POST-CARDIAC DEVICE IMPLANTATION MOBILISATION ADVICE: A NATIONAL SURVEY83DO RISK SCORES DEVELOPED TO PROTECT ONE-YEAR MORTALITY ACTUALLY HELP IN ACCURATELY SELECTING PATIENTS RECEIVING PRIMARY PREVENTION ICD?84ATRIAL TACHYCARDIA ARISING FROM THE NON-CORONARY AORTIC CUSP85THE EFFECT OF DIFFERENT ATRIAL FIBRILLATION ABLATION STRATEGIES ON SURFACE ECG P WAVE DURATION86PRESCRIBING DRONEDARONE: HOW IS IT DONE ACROSS THE UK AND IS IT SAFE?87A CASE OF WIDE COMPLEX TACHYCARDIA88TRANSITION TO DEDICATED DAY CASE DEVICES - SAFETY AND EFFICACY IN A LARGE VOLUME CENTRE89SEQUENTIAL REGIONAL DOMINANT FREQUENCY MAPPING DURING ATRIAL FIBRILLATION: A NOVEL TEQUNIQUE90ELECTIVE CARDIOVERSION ENERGY PROTOCOLS: A RETROSPECTIVE COMPARISON OF ESCALATION STRATEGIES91THE INCIDENCE OF CLINCALLY RELEVANT HAEMATOMAS WITH PERIOPERATIVE USE OF NEWER P2Y12 INHIBITORS AND INTERRUPTED NOAC THERAPY IN CARDIAC IMPLANTABLE ELECTRONIC DEVICE INSERTION92AN AUDIT OF THE OUTCOMES FOR CHEMICAL AND DIRECT CURRENT CARDIOVERSION FOR ATRIAL FIBRILLATION AT OUR DGH OVER A 3 YEAR DURATION93REAL LIFE ACUTE MANAGEMET OF HAEMODYNAMICALLY TOLERATED MONOMORPHIC VENTRICULAR TACHYCARDIA. ARE WE MAKING EVIDENCE BASED ON DECISIONS?94A SERVICE EVALUATION TO ASSESS THE EFFICACY AND SAFETY OF NOVEL ORAL ANTICOAGULANTS VERSUS WARFARIN FOR ELECTIVE CARDIVERSION IN PATIENTS WITH NON VALVULAR AF IN A NURSE LED CARDIOVERSION SERVICE95PICK UP RATE OF IMPLANTED LOOP RECORDER AT A DISTRICT HOSPITAL. Europace 2016. [DOI: 10.1093/europace/euw273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
40
|
Champney F, Maddock L, Welford J, Kemp J, Allan V, Persidskikh Y, Orini M, Ang R, Workman A, Wong L, Honarbakhsh S, Leong K, Silberbauer J, O'Nunain S, Gomes J, McCready J, Bostock J, Shaw K, McKenna C, Bailey J, Honarbakhsh S, Casas J, Wallace J, Hunter R, Schilling R, Perel P, Morley K, Banerjee A, Hemingway H, Mrochak A, Ilyina T, Goncharik D, Chasnoits A, Plashinskaya L, Taggart P, Hayward M, Lambiase P, Hosford P, Kasparov S, Lambiase P, Tinker A, Gourine A, Kettlewell S, Dempster J, Colman M, Rankin A, Myles R, Smith G, Tester D, Jaye A, FitzPatrick D, Evans M, Fleming P, Jeffrey I, Cohen M, Simpson M, Ackerman M, Behr E, Srinivasan N, Kirkby C, Firman E, Tobin L, Murphy C, Lowe M, Hunter RJ, Finlay M, Schilling RJ, Lambiase PD, Ng F, Tomlinson L, Nuthoo S, Cajilog E, Lefroy D, Qureshi N, Koa-Wing M, Whinnett Z, Linton N, Davies D, Lim P, Peters N, Kanagaratnam P, Varnava A. ORAL ABSTRACTS (1)Allied Professionals7CRYOABLATION FOR PAROXYSMAL ATRIAL FIBRILLATION - IS AN EP LAB REQUIRED?8A PATHWAY TO SAFETY - ANTICOAGULATION COMPLIANCE IN CIED PATIENTS WITH AF9UNDERSTANDING THE WAYS IN WHICH OCCUPATION IS AFFECTED BY POSTURAL TACHYCARDIA SYNDROME: A UK OCCUPATIONAL THERAPY PERSPECTIVE10DEVELOPMENT OF AN INTERGRATED SUPPORT PATHWAY FOR PATIENTS FULFILLING NICE CRITERIA FOR AN INTERNAL CARDIOVASCULAR DEBRIBRILLATOR (ICD) IN A DISTRICT GENERAL HOSPITAL11ARE CARDIOVASCULAR RISK FACTORS ALSO ASSOCIATED WITH THE INCIDENCE OF ATRIAL FIBRILLATION? A SYSTEMATIC REVIEW AND FIELD SYNOPSIS OF 23 FACTORS IN 32 INITIALLY HEALTHY COHORTS OF 20 MILLION PARTICIPANTS12BRAIN MRI FINDINGS IN PATIENTS WITH ATRIAL FIBRILLATION UNDERGOING CARDIOVERSIONBasic Science/Sudden Cardiac Death13PRELIMINARY ASSESSMENT OF THE “RE-ENTRY VULNERABILITY INDEX” AS A MARKER OF CARDIAC INSTABILITY IN THE HUMAN HEART USING WHOLE-HEART CONTACT EPICARDIAL MAPPING14OPTOGENETIC STIMULATION OF BRAINSTEM'S VAGAL PREGANGLIONIC NEURONES IS ASSOCIATED WITH NEURONAL NITRIC OXIDE SYNTHASE-DEPENDENT PROLONGATION OF VENTRICULAR EFFECTIVE REFRACTORY PERIOD15A DYNAMIC-CLAMP STUDY OF L-TYPE Ca2+ CURRENT IN RABBIT AND HUMAN ATRIAL MYOCYTES: THE CONTRIBUTION OF WINDOW ICaL TO EARLY AFTERDEPOLARISATIONS16WHOLE EXOME SEQUENCING IN SUDDEN INFANT DEATH SYNDROME17MEDIUM TERM SURVIVAL AND FAMILY SCREENING OUTCOMES IN AN IDIOPATHIC VENTRICULAR FIBRILLATION COHORT - A MULTICENTRE EXPERIENCE18CLINICAL CHARACTERISTICS OF SCD SURVIVORS WITH BRUGADA SYNDROME:- ARE SPONSANEOUS TYPE I ECG AND PREVIOUS SYNCOPE REALLY ASSOCIATED WITH HIGH RISK? Europace 2016. [DOI: 10.1093/europace/euw270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
41
|
Furniss G, Opel A, Hussein A, Pearman C, Grace A, Connelly D, Orlowski A, Banerjee A, McNicholas T, Providencia R, Montañes M, Providencia R, Panagopoulos D, Tomlinson D, Dalrymple-Hay M, Haywood G, Butler A, Ang R, Ullah W, Schwartz R, Fannon M, Finlay M, Hunter R, Schilling R, Das M, Asfour I, Morgan M, Ronayne C, Shaw M, Snowdon R, Gupta D, Todd D, King R, Hall M, Modi S, Mediratta N, Gupta D, Reddy V, Neuzil P, Willems S, Verma A, Heck P, Schilling R, Lambiase P, Hall M, Nicholl B, McQueenie R, Jani BD, McKeag N, Gallacher K, Mair F, Heaton D, Macdonald J, Burnell J, Ryan R, Marshall T, Sutton C, O'Callaghan S, Kenny R, Karim N, Srinivasan N, Ferreira M, Goncalves L, Lambiase P, Toledano M, Field E, Walsh H, Maguire K, Cervi E, Kaski J, Perez Tome M, Pantazis A, Elliott P, Lambiase P, Segal O. ORAL ABSTRACTS (3)EP & Ablation31LEFT ATRIAL POSTERIOR WALL ISOLATION (THE “BOX LESION PATTERN”) IN THE TREATMENT OF ATRIAL FIBRILLATION: A SINGLE CENTRE EXPERIENCE32DAY CASE CRYOBLATION (CRYO) FOR PAROXYSMAL ATRIAL FIBRILLATION (pAF) IN THE DISTRICT GENERAL HOSPITAL IS SAFE AND EFFECTIVE IF DONE IN HIGH VOLUME WITH EXPERIENCED OPERATORS33ABLATION INDEX-GUIDED PULMONARY VEIN ISOLATION FOR ATRIAL FIBRILLATION MAY IMPROVE CLINICAL OUTCOMES IN COMPARISON TO CONTACT FORCE-GUIDED ABLATION34THE PROCEDURAL COMPLICATION RATES AND SHORT-TERM SUCCESS RATES OF THORACOSCOPIC AF ABLATION DURING THE INSTITUTIONAL LEARNING CURVE35INITIAL PROCEDURAL RESULTS FROM DDRAMATIC-SVT STUDY: DD MECHANISM IDENTIFICATION AND LOCALISATION USING DIPOLE DENSITY MAPPING TO GUIDE ABLATION STRATEGY36MORBIDITY AND MORTALITY IN MIDDLE-AGED INDIVIDUALS WITH ATRIAL FIBRILLATION: UK BIOBANK DATAClinical EP37THE GM AHSN AF LANDSCAPE TOOL: A SHARED PUBLIC DATA PLATFORM TO PROMOTE QUALITY IMPROVEMENTS AND IDENTIFY OPPORTUNITIES TO PREVENT AF-RELATED STROKE IN THE DEVOLVED GREATER MANCHESTER HEALTH SYSTEM38REAL WORLD PERSISTENCE, ADHERENCE AND SWITCH-OVER ACROSS ANTICOAGULANTS IN ATRIAL FIBRILLATION-A NATIONAL POPULATION-BASED STUDY39ORTHOSTATIC HYPOTENSION AND ATRIAL FIBRILLATION40PREVALENCE OF SHORT QT AND CRITERIA OF SEVERITY IN A YOUNG ASYMPTOMATIC COHORT41SURFACE ELECTROCARDIOGRAPHIC FEATURES AND PREVALENCE OF ARRHYTHMIAS IN PAEDIATRIC FRIEDREICH'S ATAXIA42RISK STRATIFICATION OF TYPE 1 MYOTONIC DYSTROPHY: IS THE ECG ACCURATE ENOUGH TO SELECT PATIENTS AT RISK OF BRADYARRHYTHMIC EVENTS? Europace 2016. [DOI: 10.1093/europace/euw272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
42
|
Mellor G, Orini M, Specterman M, Sawhney V, Merghani A, Claridge S, Laksman Z, Gerull B, Simpson C, Klein G, Champagne J, Talajic M, Gardner M, Steinberg C, Janzen M, Arbour L, Green M, Angaran P, Roberts J, Leather R, Sanatani S, Chauhan V, Healey J, Krahn A, Taggart P, Srinivasan N, Hayward M, Lambiase P, Aziz Q, Finlay M, Nobles M, Anderson N, Ng K, Schilling R, Tinker A, Breitenstein A, Ullah W, Honarbakhsh S, Dhinoja M, Schilling R, Providencia R, Babu G, Chow A, Lambiase P, Panikker S, Kontogeorgis A, Wong T, Hall M, Temple I, Bartoletti S, Kalla M, Cassar M, Rajappan K, Hunter R, Maestrini V, Rosmini S, Cox A, Yeo T, Dhutia H, Narain R, Malhotra A, Behr E, Tome M, Alfakih K, Moon J, Sharma S, Mennuni S, Jackson T, Behar J, Porter B, Sieniewicz B, Webb J, Bostock J, O'Neill M, Murgatroyd F, Carr-White G, Chiribiri A, Razavi R, Chen Z, Rinaldi C. YOUNG INVESTIGATORS COMPETITION1GENETIC ANALYSIS IN THE EVALUATION OF UNEXPLAINED CARDIAC ARREST: FROM THE CARDIAC ARREST SURVIVORS WITH PRESERVED EJECTION FRACTION REGISTRY (CASPER)2IN-VIVO WHOLE HEART CONTACT MAPPING DATA AND A SIMPLE MATHEMATICAL FRAMEWORK TO UNDERSTAND THE INTERACTIONS BETWEEN ACTIVATION AND REPOLARIZATION RESITUTION DYNAMICS IN THE INTACT HUMAN HEART3THE K(ATP) CHANNEL OPENER DIAZOXIDE REDUCES AUTOMATICITY IN AN IN VITRO ATRIAL CELL MODEL - POTENTIAL FOR K(ATP) CHANNELS AS A DRUG TARGET FOR ATRIAL ARRHYTHMIAS4LONG-TERM OUTCOMES AFTER CATHETER ABLATION OF VENTRICULAR TACHYCARDIA IN PATIENTS WITH STRUCTURAL HEART DISEASE: A MULTICENTRE UK STUDY5THE BURDEN OF ARRHYTHMIAS IN LIFE-LONG ENDURANCE ATHLETES6CARDIAC MAGNETIC RESONANCE IMAGING RISK STRATIFICATION USING MARKERS OF REGIONAL AND DIFFUSE FIBROSIS FOR IMPLANTABLE CARDIOVERTER DEFIBRILLATOR THERAPY: THE VALUE OF T1 MAPPING IN NON-ISCHEMIC PATIENTS. Europace 2016. [DOI: 10.1093/europace/euw275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
43
|
Philippsen T, Orini M, Martin C, Volkova E, Ormerod J, Sohaib S, Elamin N, Blake S, Sawhney V, Ahmad S, Waring O, Bowers R, Raiman L, Hazelwood T, Mills R, Corrado C, Honarbakhsh S, Von Maydell A, Norrish G, Chubb H, Chubb H, Chubb H, Toledano M, Ruiz A, van Zalen J, Foley P, Pearman C, Rehal O, Foley P, Wong L, Foley P, Pearman C, Brahmbhatt D, Khan H, Wardley J, Akbar S, Christensen L, Hansen M, Brandes A, Tinker A, Munroe P, Lambiase P, Honarbakhsh S, McLean A, Lambiase P, Schilling R, Lane J, Chow A, Earley M, Hunter R, Khan F, Lambiase P, Schilling R, Sporton S, Dhinoja M, Camm C, Xavier R, de Sousa M, Betts T, Shun-Shin M, Wright I, Lim E, Lim P, Koawing M, Lefroy D, Linton N, Davies D, Peters N, Kanagaratnam P, Francis D, Whinnett Z, Khan M, Bowes R, Sahu J, Sheridan P, Rogers D, Kyriacou A, Kelland N, Lewis N, Lee J, Segall E, Diab I, Breitenstein A, Ullah W, Sporton S, Earley M, Finlay M, Dhinoja M, Schilling R, Hunter R, Ahmed M, Petkar S, Davidson N, Stout M, Pearce KP, Leo M, Ginks M, Rajappan K, Bashir Y, Balasubramaniam R, Sopher S, Betts T, Paisey J, Cheong J, Roy D, Adhya S, Williams S, O'Neill M, Niederer S, Providencia R, Srinivasan N, Ahsan S, Lowe M, Segal O, Hunter R, Finlay M, Earley M, Schilling R, Lambiase P, Stella S, Cantwell C, Chowdhury R, Kim S, Linton N, Whinnett Z, Koa-Wing M, Lefroy D, Davies DW, Kanagaratnam P, Lim PB, Qureshi N, Peters N, Cantarutti N, Limongelli G, Elliott P, Kaski J, Williams S, Lal K, Harrison J, Whitaker J, Kiedrowicz R, Wright M, O'Neill M, Harrison J, Whitaker J, Williams S, Wright M, Schaeffter T, Razavi R, O'Neill M, Karim R, Williams S, Harrison J, Whitaker J, Wright M, Schaeffter T, Razavi R, O'Neill M, Montanes M, Ella Field E, Walsh H, Callaghan N, Till J, Mangat J, Lowe M, Kaski J, Ruiz Duthil A, Li A, Saba M, Patel N, Beale L, Brickley G, Lloyd G, French A, Khavandi A, McCrea W, Barnes E, Chandrasekaran B, Parry J, Garth L, Chapman J, Todd D, Hobbs J, Modi S, Waktare J, Hall M, Gupta D, Snowdon R, Papageorgiou N, Providência R, Falconer D, Sewart E, Ahsan S, Segal O, Ezzat V, Rowland E, Lowe M, Lambiase P, Chow A, Swift M, Charlton P, James J, Colling A, Barnes E, Starling L, Kontogeorgis A, Roses-Noguer F, Wong T, Jarman J, Clague J, Till J, Colling A, James J, Hawkins M, Burnell S, Chandrasekaran B, Coulson J, Smith L, Choudhury M, Oguguo E, Boyett M, Morris G, Flinn W, Chari A, Belham M, Pugh P, Somarakis K, Parasa R, Allata A, Hashim H, Mathew T, Kayasundar S, Venables P, Quinn J, Ivanova J, Brown S, Oliver R, Lyons M, Chuen M, Walsh J, Robinson T, Staniforth A, Ahsan A, Jamil-Copley S. POSTERS (2)96CONTINUOUS VERSUS INTERMITTENT MONITORING FOR DETECTION OF SUBCLINICAL ATRIAL FIBRILLATION IN HIGH-RISK PATIENTS97HIGH DAY-TO-DAY INTRA-INDIVIDUAL REPRODUCIBILITY OF THE HEART RATE RESPONSE TO EXERCISE IN THE UK BIOBANK DATA98USE OF NOVEL GLOBAL ULTRASOUND IMAGING AND CONTINUEOUS DIPOLE DENSITY MAPPING TO GUIDE ABLATION IN MACRO-REENTRANT TACHYCARDIAS99ANTICOAGULATION AND THE RISK OF COMPLICATIONS IN PATIENTS UNDERGOING VT AND PVC ABLATION100NON-SUSTAINED VENTRICULAR TACHYCARDIA FREQUENTLY PRECEDES CARDIAC ARREST IN PATIENTS WITH BRUGADA SYNDROME101USING HIGH PRECISION HAEMODYNAMIC MEASUREMENTS TO ASSESS DIFFERENCES IN AV OPTIMUM BETWEEN DIFFERENT LEFT VENTRICULAR LEAD POSITIONS IN BIVENTRICULAR PACING102CAN WE PREDICT MEDIUM TERM MORTALITY FROM TRANSVENOUS LEAD EXTRACTION PRE-OPERATIVELY?103PREVENTION OF UNECESSARY ADMISSIONS IN ATRIAL FIBRILLATION104EPICARDIAL CATHETER ABLATION FOR VENTRICULAR TACHYCARDIA ON UNINTERRUPTED WARFARIN: A SAFE APPROACH?105HOW WELL DOES THE NATIONAL INSTITUTE OF CLINICAL EXCELLENCE (NICE) GUIDENCE ON TRANSIENT LOSS OF CONSCIOUSNESS (T-LoC) WORK IN A REAL WORLD? AN AUDIT OF THE SECOND STAGE SPECIALIST CARDIOVASCULAT ASSESSMENT AND DIAGNOSIS106DETECTION OF ATRIAL FIBRILLATION IN COMMUNITY LOCATIONS USING NOVEL TECHNOLOGY'S AS A METHOD OF STROKE PREVENTION IN THE OVER 65'S ASYMPTOMATIC POPULATION - SHOULD IT BECOME STANDARD PRACTISE?107HIGH-DOSE ISOPRENALINE INFUSION AS A METHOD OF INDUCTION OF ATRIAL FIBRILLATION: A MULTI-CENTRE, PLACEBO CONTROLLED CLINICAL TRIAL IN PATIENTS WITH VARYING ARRHYTHMIC RISK108PACEMAKER COMPLICATIONS IN A DISTRICT GENERAL HOSPITAL109CARDIAC RESYNCHRONISATION THERAPY: A TRADE-OFF BETWEEN LEFT VENTRICULAR VOLTAGE OUTPUT AND EJECTION FRACTION?110RAPID DETERIORATION IN LEFT VENTRICULAR FUNCTION AND ACUTE HEART FAILURE AFTER DUAL CHAMBER PACEMAKER INSERTION WITH RESOLUTION FOLLOWING BIVENTRICULAR PACING111LOCALLY PERSONALISED ATRIAL ELECTROPHYSIOLOGY MODELS FROM PENTARAY CATHETER MEASUREMENTS112EVALUATION OF SUBCUTANEOUS ICD VERSUS TRANSVENOUS ICD- A PROPENSITY MATCHED COST-EFFICACY ANALYSIS OF COMPLICATIONS & OUTCOMES113LOCALISING DRIVERS USING ORGANISATIONAL INDEX IN CONTACT MAPPING OF HUMAN PERSISTENT ATRIAL FIBRILLATION114RISK FACTORS FOR SUDDEN CARDIAC DEATH IN PAEDIATRIC HYPERTROPHIC CARDIOMYOPATHY: A SYSTEMATIC REVIEW AND META-ANALYSIS115EFFECT OF CATHETER STABILITY AND CONTACT FORCE ON VISITAG DENSITY DURING PULMONARY VEIN ISOLATION116HEPATIC CAPSULE ENHANCEMENT IS COMMONLY SEEN DURING MR-GUIDED ABLATION OF ATRIAL FLUTTER: A MECHANISTIC INSIGHT INTO PROCEDURAL PAIN117DOES HIGHER CONTACT FORCE IMPAIR LESION FORMATION AT THE CAVOTRICUSPID ISTHMUS? INSIGHTS FROM MR-GUIDED ABLATION OF ATRIAL FLUTTER118CLINICAL CHARACTERISATION OF A MALIGNANT SCN5A MUTATION IN CHILDHOOD119RADIOFREQUENCY ASSOCIATED VENTRICULAR FIBRILLATION120CONTRACTILE RESERVE EXPRESSED AS SYSTOLIC VELOCITY DOES NOT PREDICT RESPONSE TO CRT121DAY-CASE DEVICES - A RETROSPECTIVE STUDY USING PATIENT CODING DATA122PATIENTS UNDERGOING SVT ABLATION HAVE A HIGH INCIDENCE OF SECONDARY ARRHYTHMIA ON FOLLOW UP: IMPLICATIONS FOR PRE-PROCEDURE COUNSELLING123PROGNOSTIC ROLE OF HAEMOGLOBINN AND RED BLOOD CELL DITRIBUTION WIDTH IN PATIENTS WITH HEART FAILURE UNDERGOING CARDIAC RESYNCHRONIZATION THERAPY124REMOTE MONITORING AND FOLLOW UP DEVICES125A 20-YEAR, SINGLE-CENTRE EXPERIENCE OF IMPLANTABLE CARDIOVERTER DEFIBRILLATORS (ICD) IN CHILDREN: TIME TO CONSIDER THE SUBCUTANEOUS ICD?126EXPERIENCE OF MAGNETIC REASONANCE IMAGING (MEI) IN PATIENTS WITH MRI CONDITIONAL DEVICES127THE SINUS BRADYCARDIA SEEN IN ATHLETES IS NOT CAUSED BY ENHANCED VAGAL TONE BUT INSTEAD REFLECTS INTRINSIC CHANGES IN THE SINUS NODE REVEALED BY
I
(F) BLOCKADE128SUCCESSFUL DAY-CASE PACEMAKER IMPLANTATION - AN EIGHT YEAR SINGLE-CENTRE EXPERIENCE129LEFT VENTRICULAR INDEX MASS ASSOCIATED WITH ESC HYPERTROPHIC CARDIOMYOPATHY RISK SCORE IN PATIENTS WITH ICDs: A TERTIARY CENTRE HCM REGISTRY130A DGH EXPERIENCE OF DAY-CASE CARDIAC PACEMAKER IMPLANTATION131IS PRE-PROCEDURAL FASTING A NECESSITY FOR SAFE PACEMAKER IMPLANTATION? Europace 2016. [DOI: 10.1093/europace/euw274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
44
|
Martin C, Papageorgiou N, Srinivasan N, Luther V, Ang R, Saberwal B, Sawhney V, Martin C, Orini M, Srinivasan N, Bhar-Amato J, Chow A, Lowe M, Simon R, Lambiase P, Providência R, Srinivasan N, Bronis K, Moscoso Costa F, Cavaco D, Adragao P, Tousoulis D, Hunter R, Schilling R, Segal O, Chow A, Rowland E, Lowe M, Lambiase P, Orini M, Providencia R, Simon R, Khan F, Segal O, Ahsan S, Chow A, Lowe M, Schilling R, Taggart P, Lambiase P, Linton N, Jamil-Copley S, Koa-Wing M, Lim P, Qureshi N, Whinnett Z, Davies D, Peters N, Kanagaratnam P, Opel A, Ullah W, Baker V, Finlay M, Dhinoja M, Earley M, Sporton S, Hunter R, Schilling R, Roy A, Perera D, Sporton S, Dhinoja M, Segal O, Lambiase P, Lowe M, Chow A, Hunter R, Rowland E, Khan F, Ezzat V, Providencia R, Earley M, Finlay M, Schilling R, Ahsan S, Bacuetes EB, Wray MW, Dhinoja MD, Earley ME, Schilling RJS, Sporton SS, Curtain J, Gajendragadkar P, Begley D, Fynn S, Grace A, Heck P, Virdee M, Salaunkey K, Agarwal S. MODERATED POSTERS (2)51GLOBAL HIGH DENSITY MAPPING OF RE-ENTRY VULNERABILITY INDEX INDENTIFIES SITES OF RIGHT VENTRICULAR ARRHYTHMIA INITIATION IN BRUGADA SYNDROME AND ARVC52THE ROLE OF ADENOSINE-GUIDED PULMONARY VEIN ISOLATION IN PATIENTS UNDERGOING ATRIAL FIBRILLATION ABLATION:AN UPDATED META-ANALYSIS53FIRST EVIDENT THAT T-PEAK AND TPEAK-TEND CORRELATE WITH RIGHT TO LEFT AND TRANSMURAL DYNAMIC DISPERSION OF REPOLARIZATION IN THE INTACT HUMAN HEART54RIPPLE MAPPING VENTRICULAR SCAR TO CHARACTERIZE CHANNELS SUPPORTING RE-ENTRANT TACHYCARDIA AS A GUIDE TO ABLATION55LONG TERM DURABILITY OF PULMONARY VEIN ISOLATION: INSIGHTS FROM A RANDOMISED TRIAL OF CRYOBALLOON VERSUS RADIOFREQUENCY ABLATION FOR A COMBINED APPROACH56A SINGLE-CENTRE EXPERIENCE OF THE CONVERGENT PROCEDURE FOR THE TREATMENT OF LONG-STANDING PERSISTENT ATRIAL FIBRILLATION57MODERATE SEDATION IN THE CARDIAC ELECTROPHYSIOLOGY LABORATORY: A RETROSPECTIVE ANALYSIS TO ASSESS SAFETY58USE OF GENERAL ANAESTHESIA IN CATHETER ABLATION OF PERSISTENT AF: IMPROVED OUTCOME AND COST EFFECTIVENESS:. Europace 2016. [DOI: 10.1093/europace/euw269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
45
|
Venkatachalam M, Srinivasan N, Krishnakumar RV, Chitra S, Manisankar P. 2-[(4-Chlorophenyl)(2-phenyl-1 H-indol-3-yl)methyl]cyclohexan-1-one. IUCr Data 2016. [DOI: 10.1107/s2414314616006441] [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: 11/10/2022] Open
Abstract
In the title compound, C27H24ClNO, the indole ring is almost orthogonal to the chlorophenyl ring and the mean plane of the cyclohexanone ring, making a dihedral angles of 82.11 (6) and 89.96 (4)°, respectively. In the crystal, a strong N—H...O hydrogen bond links the molecules, forming chains running along thecaxis. The chains are linked by weak C—H...π interactions, forming layers parallel to theacplane.
Collapse
|
46
|
Balamurugan K, Bjørkhaug L, Mahajan S, Kanthimathi S, Njølstad PR, Srinivasan N, Mohan V, Radha V. Structure-function studies of HNF1A (MODY3) gene mutations in South Indian patients with monogenic diabetes. Clin Genet 2016; 90:486-495. [PMID: 26853433 DOI: 10.1111/cge.12757] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Revised: 02/03/2016] [Accepted: 02/03/2016] [Indexed: 12/30/2022]
Abstract
Maturity-onset diabetes of the young (MODY) is a genetically heterogeneous monogenic form of diabetes characterized by onset of diabetes below 25 years of age, autosomal dominant mode of inheritance and primary defect in insulin secretion. Mutations in the gene (HNF1A) encoding transcription factor hepatocyte nuclear factor 1A (HNF-1A) results in one of the most common forms of MODY (MODY3). HNF-1A is mainly enriched in pancreatic β-cells and hepatocytes and important for organ development and normal pancreatic function. We here report on the functional interrogation of eight missense HNF1A mutations associated with MODY3 in South Indian subjects, and the contributing effect of common variant (S487N) within HNF1A. Of the eight mutations, three mutations (p.R171G, p.G245R and p.R263H), in particular, affected HNF-1A function in transfected HeLa cells by reducing both transcriptional activity and nuclear localization, possibly due to disruption of the integrity of the three dimensional structure. The common variant p.S487N contributed further to the loss-of-function of p.R271Q (p.R271Q+p.S487N double mutant), in vitro, on both activity and localization. Our data on the first functional study of HNF1A mutations in South India subjects confers that the defect of the HNF-1A mutant proteins are responsible for MODY3 diabetes in these patients.
Collapse
Affiliation(s)
- K Balamurugan
- Department of Molecular genetics, Madras Diabetes Research Foundation, ICMR Advanced Centre for Genomics of Type 2 Diabetes and Dr. Mohan's Diabetes Specialities Centre, WHO Collaborating Centre for Non-Communicable Diseases Prevention & Control, IDF Centre of Education, Chennai, India
| | - L Bjørkhaug
- KG Jebsen Center for Diabetes Research, Department of Clinical Science, University of Bergen, Bergen, Norway.,Department of Biomedicine, University of Bergen, Bergen, Norway
| | - S Mahajan
- Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India
| | - S Kanthimathi
- Department of Molecular genetics, Madras Diabetes Research Foundation, ICMR Advanced Centre for Genomics of Type 2 Diabetes and Dr. Mohan's Diabetes Specialities Centre, WHO Collaborating Centre for Non-Communicable Diseases Prevention & Control, IDF Centre of Education, Chennai, India
| | - P R Njølstad
- KG Jebsen Center for Diabetes Research, Department of Clinical Science, University of Bergen, Bergen, Norway.,Department of Pediatrics, Haukeland University Hospital, Bergen, Norway
| | - N Srinivasan
- Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India
| | - V Mohan
- Department of Molecular genetics, Madras Diabetes Research Foundation, ICMR Advanced Centre for Genomics of Type 2 Diabetes and Dr. Mohan's Diabetes Specialities Centre, WHO Collaborating Centre for Non-Communicable Diseases Prevention & Control, IDF Centre of Education, Chennai, India
| | - V Radha
- Department of Molecular genetics, Madras Diabetes Research Foundation, ICMR Advanced Centre for Genomics of Type 2 Diabetes and Dr. Mohan's Diabetes Specialities Centre, WHO Collaborating Centre for Non-Communicable Diseases Prevention & Control, IDF Centre of Education, Chennai, India
| |
Collapse
|
47
|
Shiga Y, Umezawa N, Srinivasan N, Koyasu S, Sakai E, Miyauchi M. A metal sulfide photocatalyst composed of ubiquitous elements for solar hydrogen production. Chem Commun (Camb) 2016; 52:7470-3. [DOI: 10.1039/c6cc03199d] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A visible-light-sensitive tin sulfide photocatalyst was designed based on a ubiquitous element strategy and density functional theory (DFT) calculations.
Collapse
Affiliation(s)
- Y. Shiga
- School of Materials and Chemical Technology
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - N. Umezawa
- International Center for Materials Nanoarchitectonics
- National Institute for Materials Science (NIMS)
- Tsukuba
- Japan
| | - N. Srinivasan
- School of Materials and Chemical Technology
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - S. Koyasu
- School of Materials and Chemical Technology
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - E. Sakai
- School of Materials and Chemical Technology
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - M. Miyauchi
- School of Materials and Chemical Technology
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| |
Collapse
|
48
|
Abstract
In everyday life we perceive events as having durations. Recent research suggests that the labeling of a stimulus influences the experience of its duration. Plausibly, the social meaning attributed to a stimulus impacts upon the amount of attention allocated to it, with greater attention resulting in better encoding and longer reproduction times. However, direct evidence for the role of attention in this effect of social meaning on duration reproduction is lacking. The present study addresses this issue directly. Eighty-four male Hindu pilgrims attending theKumbh Melain India listened to an ambiguous sound clip and reproduced its duration in a prospective timing task. The context-relevant social meaning of this sound clip was manipulated through attributing the sound to either the religious festival or busy city streets. Attentional load was manipulated by asking half the participants to perform a concurrent task. Reproduced durations were longer in the Mela compared to the City condition but only when participants completed a single task. The finding that mere labeling of the stimulus impacts duration judgments in a prospective paradigm in the single-task but not the dual-task conditions suggests that the effect of social meaning is indeed mediated through the deployment of attentional resources.
Collapse
|
49
|
Sakthikumar L, Mahalakshmy R, Bhargavi G, Srinivasan N. Synthesis, spectral characterization, and single crystal structure studies of (2-nitro-ethene-1,1-diyl)-bis-((4-isopropyl-benzyl)sulfane). CRYSTALLOGR REP+ 2015. [DOI: 10.1134/s1063774515070196] [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: 11/23/2022]
|
50
|
Engelhard VH, Peske D, Woods A, Srinivasan N, Brinkman C, Ferguson A. Abstract IA23: T cell trafficking in lymphoid and non-lymphoid tissues. Cancer Immunol Res 2015. [DOI: 10.1158/2326-6074.tumimm14-ia23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Increased representation of CD8 T-lymphocytes in tumors, spontaneously, or after vaccination or adoptive therapy, is essential for immune mediated control of human cancers. T-cell infiltrates are a positive prognostic indicator of patient survival, and it has become clear that the patients who respond clinically to new generation immunotherapies are those in which an immunological infiltrate is already evident prior to treatment. Thus, limited representation of intratumoral T-cells is a major barrier to tumor control, distinct from the barrier created by immunosuppression. Understanding and overcoming this limitation will enable us to extend the effectiveness of many immunotherapies to a broader cross-section of cancer patients.
T cell infiltration into lymphoid and non-lymphoid tissues is controlled by homing receptors (HR) that engage corresponding ligands expressed on tissue-associated vasculature. Naïve T-cells enter LN based on expression of L-selectin and CCR7. These HR bind to peripheral node addressin (PNAd) and the chemokines CCL19/CCL21, respectively, which are expressed on specialized lymph node blood vessels called high endothelial venules (HEV). During differentiation, effector T-cells acquire the ability enter peripheral tissues, including tumors, by upregulating other selectins, integrins and chemokine receptors that bind to ligands expressed on inflamed vasculature. However, we lack a full understanding of which HR expressed by CD8 T-cell effectors control their migration into tumors, how this is influenced by expression of the corresponding ligands on tumor vasculature, and whether ligand expression changes as a result of vessel normalization. We have explored the hypothesis that CD8 T-cell effectors activated in different secondary lymphoid organs express distinct HR, which in turn control infiltration into tumors in different anatomical locations. We identified 3 major populations of primary CD8 T-cell effectors based on site of activation and HR expression pattern, and have established which HR enable infiltration of one of these populations into tumors.
While it has been assumed that all tumor-infiltrating lymphocytes are effectors that differentiate in tumor-draining LN and subsequently enter the tumor, we have shown that naïve CD8 T-cells also can directly enter tumors. These naïve cells differentiate into functional effectors in the tumor, and can promote its control. Naïve CD8 T-cell infiltration depends on L-selectin and CCR7, as in lymph nodes, and on the development of blood vessels in the tumor that express PNAd and CCL21 and resemble lymph node HEV. Similar lymph node-like vasculature has been reported in human tumors along with ectopic organized lymphoid tissue (tertiary lymphoid organs or TLO), and correlated with longer metastasis-free, disease-free, and overall survival.
Development of this vasculature in murine tumors was controlled by a novel mechanism involving effector CD8 T-cells and NK cells that secreted Lymphotoxin-α3 and IFNγ;. This suggests that early infiltration of effectors induces LN-like vasculature, which in turn supports a self-sustaining recruitment of naïve T-cells that differentiate within the tumor. In intraperitoneal but not subcutaneous tumors, this lymph node-like vasculature was also associated with organized aggregates of B-lymphocytes and gp38+ fibroblasts that resembled TLO. The differential expression of these elements in SC and IP tumors reflects differences in immunological tumor microenvironments that remain to be explored further. Nonetheless, these results establish LN-like vasculature as both a consequence of and key contributor to anti-tumor immunity based on its role in promoting T-cell infiltration.
Citation Format: Victor H. Engelhard, David Peske, Amber Woods, Nithya Srinivasan, Colin Brinkman, Andrew Ferguson. T cell trafficking in lymphoid and non-lymphoid tissues. [abstract]. In: Proceedings of the AACR Special Conference: Tumor Immunology and Immunotherapy: A New Chapter; December 1-4, 2014; Orlando, FL. Philadelphia (PA): AACR; Cancer Immunol Res 2015;3(10 Suppl):Abstract nr IA23.
Collapse
Affiliation(s)
| | - David Peske
- University of Virginia School of Medicine, Charlottesville, VA
| | - Amber Woods
- University of Virginia School of Medicine, Charlottesville, VA
| | | | - Colin Brinkman
- University of Virginia School of Medicine, Charlottesville, VA
| | - Andrew Ferguson
- University of Virginia School of Medicine, Charlottesville, VA
| |
Collapse
|