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Han Y, Xu J, Chopra H, Zhang Z, Dubey N, Dissanayaka WL, Nör JE, Bottino MC. Injectable Tissue-Specific Hydrogel System for Pulp-Dentin Regeneration. J Dent Res 2024; 103:398-408. [PMID: 38410924 DOI: 10.1177/00220345241226649] [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: 02/28/2024] Open
Abstract
The quest for finding a suitable scaffold system that supports cell survival and function and, ultimately, the regeneration of the pulp-dentin complex remains challenging. Herein, we hypothesized that dental pulp stem cells (DPSCs) encapsulated in a collagen-based hydrogel with varying stiffness would regenerate functional dental pulp and dentin when concentrically injected into the tooth slices. Collagen hydrogels with concentrations of 3 mg/mL (Col3) and 10 mg/mL (Col10) were prepared, and their stiffness and microstructure were assessed using a rheometer and scanning electron microscopy, respectively. DPSCs were then encapsulated in the hydrogels, and their viability and differentiation capacity toward endothelial and odontogenic lineages were evaluated using live/dead assay and quantitative real-time polymerase chain reaction. For in vivo experiments, DPSC-encapsulated collagen hydrogels with different stiffness, with or without growth factors, were injected into pulp chambers of dentin tooth slices and implanted subcutaneously in severe combined immunodeficient (SCID) mice. Specifically, vascular endothelial growth factor (VEGF [50 ng/mL]) was loaded into Col3 and bone morphogenetic protein (BMP2 [50 ng/mL]) into Col10. Pulp-dentin regeneration was evaluated by histological and immunofluorescence staining. Data were analyzed using 1-way or 2-way analysis of variance accordingly (α = 0.05). Rheology and microscopy data revealed that Col10 had a stiffness of 8,142 Pa with a more condensed and less porous structure, whereas Col3 had a stiffness of 735 Pa with a loose microstructure. Furthermore, both Col3 and Col10 supported DPSCs' survival. Quantitative polymerase chain reaction showed Col3 promoted significantly higher von Willebrand factor (VWF) and CD31 expression after 7 and 14 d under endothelial differentiation conditions (P < 0.05), whereas Col10 enhanced the expression of dentin sialophosphoprotein (DSPP), alkaline phosphatase (ALP), runt-related transcription factor 2 (Runx2), and collagen 1 (Col1) after 7, 14, and 21 d of odontogenic differentiation (P < 0.05). Hematoxylin and eosin and immunofluorescence (CD31 and vWF) staining revealed Col10+Col3+DPSCs+GFs enhanced pulp-dentin tissue regeneration. In conclusion, the collagen-based concentric construct modified by growth factors guided the specific lineage differentiation of DPSCs and promoted pulp-dentin tissue regeneration in vivo.
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Affiliation(s)
- Y Han
- Department of Cariology, Restorative Sciences, and Endodontics, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
- Applied Oral Sciences and Community Dental Care, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China
| | - J Xu
- Department of Cariology, Restorative Sciences, and Endodontics, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - H Chopra
- Department of Periodontics and Oral Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Z Zhang
- Department of Cariology, Restorative Sciences, and Endodontics, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - N Dubey
- Faculty of Dentistry, National University of Singapore, Singapore, Singapore
| | - W L Dissanayaka
- Applied Oral Sciences and Community Dental Care, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China
| | - J E Nör
- Department of Cariology, Restorative Sciences, and Endodontics, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
- Department of Otolaryngology-Head and Neck Surgery, University of Michigan Health System, Ann Arbor, MI, USA
- Department of Biomedical Engineering, College of Engineering, University of Michigan, Ann Arbor, MI, USA
| | - M C Bottino
- Department of Cariology, Restorative Sciences, and Endodontics, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
- Department of Biomedical Engineering, College of Engineering, University of Michigan, Ann Arbor, MI, USA
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Feng S, McNehlan ME, Kinsella RL, Sur Chowdhury C, Chavez SM, Naik SK, McKee SR, Van Winkle JA, Dubey N, Samuels A, Swain A, Cui X, Hendrix SV, Woodson R, Kreamalmeyer D, Smirnov A, Artyomov MN, Virgin HW, Wang YT, Stallings CL. Autophagy promotes efficient T cell responses to restrict high-dose Mycobacterium tuberculosis infection in mice. Nat Microbiol 2024; 9:684-697. [PMID: 38413834 DOI: 10.1038/s41564-024-01608-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2022] [Accepted: 01/16/2024] [Indexed: 02/29/2024]
Abstract
Although autophagy sequesters Mycobacterium tuberculosis (Mtb) in in vitro cultured macrophages, loss of autophagy in macrophages in vivo does not result in susceptibility to a standard low-dose Mtb infection until late during infection, leaving open questions regarding the protective role of autophagy during Mtb infection. Here we report that loss of autophagy in lung macrophages and dendritic cells results in acute susceptibility of mice to high-dose Mtb infection, a model mimicking active tuberculosis. Rather than observing a role for autophagy in controlling Mtb replication in macrophages, we find that autophagy suppresses macrophage responses to Mtb that otherwise result in accumulation of myeloid-derived suppressor cells and subsequent defects in T cell responses. Our finding that the pathogen-plus-susceptibility gene interaction is dependent on dose has important implications both for understanding how Mtb infections in humans lead to a spectrum of outcomes and for the potential use of autophagy modulators in clinical medicine.
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Affiliation(s)
- Siwei Feng
- Center for Infectious Disease Research, Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China
| | - Michael E McNehlan
- Department of Molecular Microbiology, Center for Women's Infectious Disease Research, Washington University School of Medicine, St. Louis, MO, USA
| | - Rachel L Kinsella
- Department of Molecular Microbiology, Center for Women's Infectious Disease Research, Washington University School of Medicine, St. Louis, MO, USA
| | - Chanchal Sur Chowdhury
- Department of Molecular Microbiology, Center for Women's Infectious Disease Research, Washington University School of Medicine, St. Louis, MO, USA
| | - Sthefany M Chavez
- Department of Molecular Microbiology, Center for Women's Infectious Disease Research, Washington University School of Medicine, St. Louis, MO, USA
| | - Sumanta K Naik
- Department of Molecular Microbiology, Center for Women's Infectious Disease Research, Washington University School of Medicine, St. Louis, MO, USA
| | - Samuel R McKee
- Department of Molecular Microbiology, Center for Women's Infectious Disease Research, Washington University School of Medicine, St. Louis, MO, USA
| | - Jacob A Van Winkle
- Department of Molecular Microbiology, Center for Women's Infectious Disease Research, Washington University School of Medicine, St. Louis, MO, USA
| | - Neha Dubey
- Department of Molecular Microbiology, Center for Women's Infectious Disease Research, Washington University School of Medicine, St. Louis, MO, USA
| | - Amanda Samuels
- Department of Molecular Microbiology, Center for Women's Infectious Disease Research, Washington University School of Medicine, St. Louis, MO, USA
| | - Amanda Swain
- Department of Pathology and Immunology, Washington University School of Medicine, St Louis, MO, USA
| | - Xiaoyan Cui
- Center for Infectious Disease Research, Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China
| | - Skyler V Hendrix
- Department of Molecular Microbiology, Center for Women's Infectious Disease Research, Washington University School of Medicine, St. Louis, MO, USA
| | - Reilly Woodson
- Department of Molecular Microbiology, Center for Women's Infectious Disease Research, Washington University School of Medicine, St. Louis, MO, USA
| | - Darren Kreamalmeyer
- Department of Molecular Microbiology, Center for Women's Infectious Disease Research, Washington University School of Medicine, St. Louis, MO, USA
| | - Asya Smirnov
- Department of Molecular Microbiology, Center for Women's Infectious Disease Research, Washington University School of Medicine, St. Louis, MO, USA
| | - Maxim N Artyomov
- Department of Pathology and Immunology, Washington University School of Medicine, St Louis, MO, USA
| | - Herbert W Virgin
- Department of Pathology and Immunology, Washington University School of Medicine, St Louis, MO, USA
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Ya-Ting Wang
- Center for Infectious Disease Research, Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China.
- Department of Molecular Microbiology, Center for Women's Infectious Disease Research, Washington University School of Medicine, St. Louis, MO, USA.
- SXMU-Tsinghua Collaborative Innovation Center for Frontier Medicine, Shanxi Medical University, Taiyuan, Shanxi, China.
| | - Christina L Stallings
- Department of Molecular Microbiology, Center for Women's Infectious Disease Research, Washington University School of Medicine, St. Louis, MO, USA.
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Dubey N, Chandra S. Miniaturized Biosensors Based on Lanthanide-Doped Upconversion Polymeric Nanofibers. Biosensors (Basel) 2024; 14:116. [PMID: 38534223 DOI: 10.3390/bios14030116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 02/08/2024] [Accepted: 02/19/2024] [Indexed: 03/28/2024]
Abstract
Electrospun nanofibers possess a large surface area and a three-dimensional porous network that makes them a perfect material for embedding functional nanoparticles for diverse applications. Herein, we report the trends in embedding upconversion nanoparticles (UCNPs) in polymeric nanofibers for making an advanced miniaturized (bio)analytical device. UCNPs have the benefits of several optical properties, like near-infrared excitation, anti-Stokes emission over a wide range from UV to NIR, narrow emission bands, an extended lifespan, and photostability. The luminescence of UCNPs can be regulated using different lanthanide elements and can be used for sensing and tracking physical processes in biological systems. We foresee that a UCNP-based nanofiber sensing platform will open opportunities in developing cost-effective, miniaturized, portable and user-friendly point-of-care sensing device for monitoring (bio)analytical processes. Major challenges in developing microfluidic (bio)analytical systems based on UCNPs@nanofibers have been reviewed and presented.
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Affiliation(s)
- Neha Dubey
- Department of Chemistry, Sunandan Divatia School of Science, SVKM's NMIMS (Deemed to be) University, V.L. Mehta Road, Vile Parle (West), Mumbai 400056, India
| | - Sudeshna Chandra
- Hanse-Wissenschaftskolleg-Institute for Advanced Study (HWK), Lehmkuhlenbusch 4, 27753 Delmenhorst, Germany
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Naik SK, McNehlan ME, Mreyoud Y, Kinsella RL, Smirnov A, Chowdhury CS, McKee SR, Dubey N, Woodson R, Kreamalmeyer D, Stallings CL. Type I IFN signaling in the absence of IRGM1 promotes M. tuberculosis replication in immune cells by suppressing T cell responses. bioRxiv 2023:2023.10.03.560720. [PMID: 37873329 PMCID: PMC10592944 DOI: 10.1101/2023.10.03.560720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2023]
Abstract
Polymorphisms in the IRGM gene are associated with susceptibility to tuberculosis in humans. A murine ortholog of Irgm, Irgm1, is also essential for controlling Mycobacterium tuberculosis (Mtb) infection in mice. Multiple processes have been associated with IRGM1 activity that could impact the host response to Mtb infection, including roles in autophagy-mediated pathogen clearance and expansion of activated T cells. However, what IRGM1-mediated pathway is necessary to control Mtb infection in vivo and the mechanistic basis for this control remains unknown. We dissected the contribution of IRGM1 to immune control of Mtb pathogenesis in vivo and found that Irgm1 deletion leads to higher levels of IRGM3-dependent type I interferon signaling. The increased type I interferon signaling precludes T cell expansion during Mtb infection. The absence of Mtb-specific T cell expansion in Irgm1-/- mice results in uncontrolled Mtb infection in neutrophils and alveolar macrophages, which directly contributes to susceptibility to infection. Together, our studies reveal that IRGM1 is required to promote T cell-mediated control of Mtb infection in neutrophils, which is essential for the survival of Mtb-infected mice. These studies also uncover new ways type I interferon signaling can impact TH1 immune responses.
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Affiliation(s)
- Sumanta K. Naik
- Department of Molecular Microbiology, Center for Women’s Infectious Disease Research, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Michael E. McNehlan
- Department of Molecular Microbiology, Center for Women’s Infectious Disease Research, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Yassin Mreyoud
- Department of Molecular Microbiology, Center for Women’s Infectious Disease Research, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Rachel L. Kinsella
- Department of Molecular Microbiology, Center for Women’s Infectious Disease Research, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Asya Smirnov
- Department of Molecular Microbiology, Center for Women’s Infectious Disease Research, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Chanchal Sur Chowdhury
- Department of Molecular Microbiology, Center for Women’s Infectious Disease Research, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Samuel R. McKee
- Department of Molecular Microbiology, Center for Women’s Infectious Disease Research, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Neha Dubey
- Department of Molecular Microbiology, Center for Women’s Infectious Disease Research, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Reilly Woodson
- Department of Molecular Microbiology, Center for Women’s Infectious Disease Research, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Darren Kreamalmeyer
- Department of Molecular Microbiology, Center for Women’s Infectious Disease Research, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Christina L. Stallings
- Department of Molecular Microbiology, Center for Women’s Infectious Disease Research, Washington University School of Medicine, St. Louis, MO 63110, USA
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5
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Bhat S, Xu W, Varghese C, Dubey N, Wells CI, Harmston C, O'Grady G, Bissett IP, Lin AY. Efficacy of different surgical treatments for management of anal fistula: a network meta-analysis. Tech Coloproctol 2023; 27:827-845. [PMID: 37460830 PMCID: PMC10485107 DOI: 10.1007/s10151-023-02845-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Accepted: 07/06/2023] [Indexed: 09/09/2023]
Abstract
PURPOSE Currently, the anal fistula treatment which optimises healing and preserves bowel continence remains unclear. The aim of our study was to compare the relative efficacy of different surgical treatments for AF through a network meta-analysis. METHODS Systematic searches of MEDLINE, EMBASE and CENTRAL databases up to October 2022 identified randomised controlled trials (RCTs) comparing surgical treatments for anal fistulae. Fistulae were classified as simple (inter-sphincteric or low trans-sphincteric fistulae crossing less than 30% of the external anal sphincter (EAS)) and complex (high trans-sphincteric fistulae involving more than 30% of the EAS). Treatments evaluated in only one trial were excluded from the primary analyses to minimise bias. The primary outcomes were rates of success in achieving AF healing and bowel incontinence. RESULTS Fifty-two RCTs were included. Of the 14 treatments considered, there were no significant differences regarding short-term (6 months or less postoperatively) and long-term (more than 6 months postoperatively) success rates between any of the treatments in patients with both simple and complex anal fistula. Ligation of the inter-sphincteric fistula tract (LIFT) ranked best for minimising bowel incontinence in simple (99.1% of comparisons; 3 trials, n = 70 patients) and complex anal fistula (86.2% of comparisons; 3 trials, n = 102 patients). CONCLUSIONS There is insufficient evidence in existing RCTs to recommend one treatment over another regarding their short and long-term efficacy in successfully facilitating healing of both simple and complex anal fistulae. However, LIFT appears to be associated with the least impairment of bowel continence, irrespective of AF classification.
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Affiliation(s)
- S Bhat
- Surgical and Translational Research Centre, Department of Surgery, The University of Auckland, Auckland, New Zealand
- Department of Surgery, Te Whatu Ora MidCentral, Palmerston North, New Zealand
| | - W Xu
- Surgical and Translational Research Centre, Department of Surgery, The University of Auckland, Auckland, New Zealand
- Department of Surgery, Te Whatu Ora Te Toka Tumai, Whangārei, New Zealand
| | - C Varghese
- Surgical and Translational Research Centre, Department of Surgery, The University of Auckland, Auckland, New Zealand
| | - N Dubey
- Department of General Medicine, Tauranga Hospital, Te Whatu Ora, Tauranga, New Zealand
| | - C I Wells
- Surgical and Translational Research Centre, Department of Surgery, The University of Auckland, Auckland, New Zealand
- Department of Surgery, Te Whatu Ora Te Toka Tumai, Auckland, New Zealand
| | - C Harmston
- Surgical and Translational Research Centre, Department of Surgery, The University of Auckland, Auckland, New Zealand
- Department of Surgery, Te Whatu Ora Te Toka Tumai, Whangārei, New Zealand
| | - G O'Grady
- Surgical and Translational Research Centre, Department of Surgery, The University of Auckland, Auckland, New Zealand
- Auckland Bioengineering Institute, The University of Auckland, Auckland, New Zealand
| | - I P Bissett
- Surgical and Translational Research Centre, Department of Surgery, The University of Auckland, Auckland, New Zealand
| | - A Y Lin
- Department of Surgery and Anaesthesia, University of Otago, Wellington, New Zealand.
- Department of Surgery, Wellington Regional Hospital, Te Whatu Ora, Wellington, New Zealand.
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Ram T, Verma N, Kaur J, Misra AK, Dubey V, Dubey N, Michalska-Domańska M, Saji J, Yadav RS. Estimation of spectroscopic parameters and TL glow curve analysis of Eu 3+-activated CaY 2O 4 phosphor. RSC Adv 2023; 13:26357-26365. [PMID: 37671341 PMCID: PMC10476512 DOI: 10.1039/d3ra03200k] [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] [Received: 05/14/2023] [Accepted: 08/04/2023] [Indexed: 09/07/2023] Open
Abstract
The solid-state reaction method was utilised to create a down-conversion phosphor in an air environment in CaY2O4:Eu3+ nanocrystalline material. The calcination temperature was set at 1000 °C, and the sintering temperature was set at 1300 °C. Following annealing, confirmation of the crystallinity quality of the phosphor was accomplished by the use of X-ray diffraction analysis. The particle size was predicted to be 43.113 nm using Scherrer's formula. To produce down-conversion luminescence spectra, an excitation wavelength of 247 nm was applied with a fluorescence spectrophotometer. The PL got increasingly intense as the concentration of the dopant increased. The maximum intensity was measured at 2.0 mol% of Eu3+ ion, which gradually decreased as the concentration increased because of concentration quenching. To analyse spectrophotometric peak determinations, the approach developed by the Commission Internationale de l'Éclairage (CIE) was used. Thermoluminescence (TL) glow curve analysis of the CaY2O4:Eu3+-doped phosphor manufactured here revealed a wide TL centred at 225 °C, which comprised of so many peaks that may be extracted by the computerised glow curve deconvolution (CGCD) approach using glow-fit software. The associated kinetic parameters were then determined. The prepared phosphor may be useful for application in various display devices upon excitation by 247 nm; the prominent 613 nm peak of the Eu3+ ion (5D0 → 7F2) electric dipole transition features a red component. CaY2O4:Eu3+ phosphors show promise as materials for potential use in phosphor-converted white LEDs in the field of solid-state lighting technology. The linear connection that the TL glow curve has with UV dose provides evidence for its possible use in dosimetry.
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Affiliation(s)
- Tirath Ram
- Department of Physics, Government Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg C.G. India
| | - Neeraj Verma
- Department of Physics, Government Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg C.G. India
| | - Jagjeet Kaur
- Department of Physics, Government Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg C.G. India
| | - Abhishek Kumar Misra
- Department of Physics, Government Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg C.G. India
| | - Vikas Dubey
- Department of Physics, North Eastern Hill University (NEHU) Shillong Meghalaya 493022 India
| | - Neha Dubey
- Department of Physics, Government Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg C.G. India
| | - Marta Michalska-Domańska
- Institute of Optoelectronics, Military University of Technology Kaliskiego 2 00-908 Warsaw Mazovia Poland
| | - Janita Saji
- Department of Sciences and Humanities, School of Engineering and Technology CHRIST (Deemed to be University) Bangalore India
| | - Ram Sagar Yadav
- Department of Statistics, Institute of Science, Banaras Hindu University Varanasi 221005 India
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Ram T, Verma N, Kaur J, Misra AK, Dubey V, Dubey N, Vij A, Rao MC. Intense green light emission and thermoluminescence glow curve analysis of Tb 3+ -activated CaY 2 O 4 phosphor. LUMINESCENCE 2023; 38:1591-1596. [PMID: 37329119 DOI: 10.1002/bio.4541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 03/06/2023] [Accepted: 06/13/2023] [Indexed: 06/18/2023]
Abstract
Here, the synthesis and luminescence analysis of the Tb3+ -activated phosphor were reported. The CaY2 O4 phosphors were synthesized using a modified solid-state reaction method with a variable doping concentration of Tb3+ ion (0.1-2.5 mol%). As synthesized, the phosphor was characterized using Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction analysis techniques for the optimized concentration of doping ions. The prepared phosphor showed a cubic structure, and FTIR analysis confirmed functional group analysis. It was discovered that the intensity of 1.5 mol% was higher than at other concentrations after the photoluminescence (PL) excitation and emission spectra were recorded for different concentrations of doping ions. The excitation was monitored at 542 nm, and the emission was monitored at 237 nm. At 237 nm excitation, the emission peaks were found at 620 nm (5 D4 →7 F3 ), 582 nm (5 D4 →7 F4 ), 542 nm (5 D4 →7 F5 ), and 484 nm (5 D4 →7 F6 ). The 1931 CIE (x, y) chromaticity coordinates showed the distribution of the spectral region calculated from the PL emission spectra. The values of (x = 0.34 and y = 0.60) were very close to dark green emission. Therefore, the produced phosphor would be very useful for light-emitting diode (green component) applications. Thermoluminescence glow curve analysis for various concentrations of doping ions and various ultraviolet (UV) exposure times was carried out, and a single broad peak was found at 252°C. The computerized glow curve deconvolution method was used to obtain the related kinetic parameters. The prepared phosphor exhibited an excellent response to UV dose and could be useful for UV ray dosimetry.
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Affiliation(s)
- Tirath Ram
- Department of Physics, Government Vishwanath Yadav Tamaskar Postgraduate Autonomous College, Durg, India
| | - Neeraj Verma
- Department of Physics, Government Vishwanath Yadav Tamaskar Postgraduate Autonomous College, Durg, India
| | - Jagjeet Kaur
- Department of Physics, Government Vishwanath Yadav Tamaskar Postgraduate Autonomous College, Durg, India
| | - Abhishek Kumar Misra
- Department of Physics, Government Vishwanath Yadav Tamaskar Postgraduate Autonomous College, Durg, India
| | - Vikas Dubey
- Department of Physics, Bhilai Institute of Technology, Raipur, India
| | - Neha Dubey
- Department of Physics, Government Vishwanath Yadav Tamaskar Postgraduate Autonomous College, Durg, India
| | - Ankush Vij
- Department of Physics and Astrophysics, Central University of Haryana, Mahendergarh, India
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8
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Verma N, Michalska-Domańska M, Ram T, Kaur J, Misra AK, Dubey V, Dubey N, Tiwari K, Rao MC. Optimizing the luminescence efficiency of an europium (Eu 3+) doped SrY 2O 4 phosphor for flexible display and lighting applications. RSC Adv 2023; 13:20217-20228. [PMID: 37416907 PMCID: PMC10320686 DOI: 10.1039/d3ra03199c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Accepted: 06/26/2023] [Indexed: 07/08/2023] Open
Abstract
This research paper reports the synthesis and luminescence study of an Eu3+ activated SrY2O4 phosphor prepared by a modified solid-state reaction method with varying concentrations of Eu3+ ions (0.1-2.5 mol%). X-ray diffraction (XRD) revealed the orthorhombic structure and Fourier transform infrared spectroscopy (FTIR) methods were used to analyse the produced phosphors. Photoluminescence emission and excitation spectra were recorded for varying concentrations of Eu3+ ions, and an optimum concentration of 2.0 mol% was found to produce the highest intensity. Under 254 nm excitation the emission peaks were found to be at 580 nm, 590 nm, 611 nm and 619 nm, corresponding to transitions at 5D0 → 7F0, 5D0 → 7F1, and 5D0 → 7F2 respectively. Because of Eu3+ inherent luminosity, these emission peaks indicate radiative transitions between excited states of ions, making them useful for developing white light-emitting phosphors for optoelectronic and flexible display applications. The 1931 CIE (x, y) chromaticity coordinates were calculated from the photoluminescence emission spectra and found to be near white light emission, indicating the potential application of the prepared phosphor for light emitting diodes (white component). TL glow curve analysis was also performed for various concentrations of doping ions and UV exposure times, and a single broad peak was observed at 187 °C. Using the computerised glow curve deconvolution (CGCD) method, kinetic parameters were computed.
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Affiliation(s)
- Neeraj Verma
- Department of Physics, Government Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg Chhattisgarh India
| | | | - Tirath Ram
- Department of Physics, Government Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg Chhattisgarh India
| | - Jagjeet Kaur
- Department of Physics, Government Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg Chhattisgarh India
| | - Abhishek Kumar Misra
- Department of Physics, Government Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg Chhattisgarh India
| | - Vikas Dubey
- Department of Physics, Bhilai Institute of Technology Raipur Chhattisgarh India
| | - Neha Dubey
- Department of Physics, Government Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg Chhattisgarh India
| | - Kanchan Tiwari
- Government Nagarjuna Post Graduate College of Science Raipur Chhattisgarh India
| | - M C Rao
- Department of Physics, Andhra Loyola College Vijayawada Andhra Pradesh India
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Dubey N, Anjum S, Saxena A, Soni D, Marothiya S, Prakash A, Bharti C. 38. Effect of Chlorhexidine Rinsed Blood Contamination on Bond Strength of Brackets Bonded with Self-etch Primer- An in Vitro Study. Mymensingh Med J 2023; 32:550-555. [PMID: 37002770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2023]
Abstract
The present invitro type of study has done to check the effect of blood contamination & chlorhexidine combination on the bond strength of brackets bonded with self-etch primer technique. The study consisted of ninety sound human upper premolars (extracted for orthodontic purpose) fixed in a self-cure acrylic block and segregated into three groups of 30 samples each. 0.022 slot metal MBT brackets (Gemini series-3M unitek) were bonded with self-etch primer using Transbond XT composite, CA, USA and light cure for 40 seconds) on clean buccal surface. Teeth were divided into 3 groups-Group A/Control group, Group B, Group C. A computer was used to record the force applied to debond the bonded bracket in the unit of Newton. The analysis of variance indicated that there were significant differences (F value = 6.891, p value=0.002) in bond strengths between the various groups tested. The highest value of shear bond strength occurred when chlorhexidine (Group C) was used to remove the blood contamination (mean=15.874 MPa). When bonding was done in ideal condition (Group A), shear bond strength obtained was slightly lower (mean=14.497 MPa) as compared to Group C. On the other hand, lowest shear bond strength among all three groups occurred when blood contamination (Group B) was removed with water (mean=11.059 MPa). Analysis of the study showed that shear bond strength of orthodontic brackets to enamel significantly decreased during bonding with self-etch primer in blood contamination condition. Self-etch primer displayed considerably superior performance with the use of chlorhexidine instead of water to wash the blood contamination.
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Affiliation(s)
- N Dubey
- Dr Nitu Dubey, Senior Lecturer, Department of Orthodontics and Dentofacial Orthopaedics, Mithila Minority Dental College and Hospital (MMDC&H), Darbhanga, Bihar, India; E-mail:
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Sahu MK, Dubey N, Pandey R, Shukla SS, Gidwani B. Formulation, Evaluation, and Validation of Microspheres of Cyclophosphamide for Topical Delivery. Pharmacophore 2023. [DOI: 10.51847/e4gvuon96z] [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: 03/03/2023]
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11
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Morthekai P, Tiwari P, Murari M, Singh P, Thakur B, Manoj M, Ali S, Singh V, Kumar K, Rai J, Dubey N, Srivastava P. Further investigations towards luminescence dating of diatoms. RADIAT MEAS 2022. [DOI: 10.1016/j.radmeas.2022.106803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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12
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Gupta A, Prasad N, Shirale V, Dubey N, Dubey IB. Role of diagnostic laparoscopy in suspected abdominal tuberculosis. Asian J Med Sci 2022. [DOI: 10.3126/ajms.v13i5.42908] [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: 11/18/2022] Open
Abstract
Background: The difficulty in confirming the diagnosis, morbidity and mortality associated with laparotomy in patients with abdominal Tuberculosis (TB) has generated interest in laparoscopy to obtain specimens for histological and microbiological assessment.
Aims and Objectives: Difficulty in sample procurement, paucibacillary load and non-specific clinical, biochemical, and radiological features makes early diagnosis difficult in abdominal TB. Diagnostic laparoscopy with peritoneal biopsy can provide rapid and correct diagnosis of abdominal TB and reduce significant morbidity and mortality.
Materials and Methods: Laparoscopy with umbilical port enabled direct inspection of peritoneum, intra-abdominal organs and facilitated obtaining biopsy specimens, cultures, and aspiration.
Results: Diagnostic laparoscopy has an important role not only in diagnosing abdominal TB, but also to rule out TB in certain cases. In our study, mesenteric lymphadenopathy was present in 85% of cases, tubercles in 63% and adhesions in 73%. An alternative diagnosis was established in 6 suspected abdominal TB patients (20%) who were microbiologically confirmed TB negative.
Conclusion: The study showed the feasibility of diagnostic laparoscopy in diagnosis of abdominal TB by sampling macroscopically visible pathological tissue with a low complication and conversion rate in most patients with suspected TB, and also providing an alternative diagnosis.
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Yadav S, Tiwari T, Yadav AK, Dubey N, Mishra LK, Singh AL, Kapoor P. Role of Workplace Spirituality, Empathic Concern and Organizational Politics in Employee Wellbeing: A Study on Police Personnel. Front Psychol 2022; 13:881675. [PMID: 35572283 PMCID: PMC9105451 DOI: 10.3389/fpsyg.2022.881675] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 04/04/2022] [Indexed: 01/07/2023] Open
Abstract
Employee wellbeing as a central aspect of organizational growth has been widely regarded and accepted. Therefore, a considerable growth in the number of researches focusing on employee wellbeing has been comprehended in recent years. Employee wellbeing characterizes the individual's own cognitive interpretation of his/her life at work. The present study made an attempt to examine how workplace spirituality, empathic concern and organizational politics influences employee wellbeing. It was hypothesized that empathic concern mediates the relationship between workplace spirituality and employee wellbeing while organizational politics act as a moderator in this relationship. A survey was conducted on 253 employees working in Uttar Pradesh Police department (Uttar Pradesh, India). The results obtained revealed that workplace spirituality, empathic concern and employee wellbeing carries a positive association among them whereas these variables were found to be negatively correlated with organizational politics. Results also depicted that empathic concern significantly mediates between workplace spirituality and employee wellbeing. Further, moderated mediation analysis confirmed employee wellbeing as a function of workplace spirituality, empathic concern and organizational politics. The present study has put forward several practical implications for business practitioners and research directions for academicians, emphasizing upon the need to investigate the comprehensive impact of employee wellbeing in organization and the society as a whole.
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Affiliation(s)
- Shreshtha Yadav
- Department of Psychology, Banaras Hindu University, Varanasi, India
| | - Trayambak Tiwari
- Department of Psychology, Banaras Hindu University, Varanasi, India
| | - Anil Kumar Yadav
- Department of Psychology, Banaras Hindu University, Varanasi, India
| | - Neha Dubey
- Department of Psychology, Rajendra College, Jai Prakash University, Chapra, India
| | - Lalit Kumar Mishra
- Department of Psychology, Indira Gandhi National Tribal University, Amarkantak, India
| | - Anju L. Singh
- Department of Psychology, Vasanta Kanya Mahavidhyalaya, Banaras Hindu University, Varanasi, India
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Dubey N, Ribeiro J, Ferreira J, Xu J, Bordini E, Qu L, Mei L, Schwendeman A, Bottino M. Antimicrobial and Angiogenic Hybrid Scaffold for Regenerative Endodontics. Dent Mater 2022. [DOI: 10.1016/j.dental.2021.12.126] [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: 11/03/2022]
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Awate V, Patel L, Sharma R, Beliya AK, Tiwari R, Dubey V, Dubey N. Thermoluminescence Glow Curve Analysis of Mn4+-Doped Barium Yttrium Oxide Phosphor. LUMINESCENCE 2021. [DOI: 10.1515/9783110676457-008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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17
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Kushwah KK, Mahobia SK, Mishra V, Chhawra S, Tiwari R, Dubey N, Dubey V. Chapter 5 Luminescence Studies of Y 2Sr 3B 4O 12 Phosphor Doped with Europium Ion. LUMINESCENCE 2021. [DOI: 10.1515/9783110676457-005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Dwivedi M, Dubey N, Pansari AJ, Bapi RS, Das M, Guha M, Banerjee R, Pramanick G, Basu J, Ghosh A. Effects of Meditation on Structural Changes of the Brain in Patients With Mild Cognitive Impairment or Alzheimer's Disease Dementia. Front Hum Neurosci 2021; 15:728993. [PMID: 34867239 PMCID: PMC8633496 DOI: 10.3389/fnhum.2021.728993] [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: 06/22/2021] [Accepted: 10/12/2021] [Indexed: 11/13/2022] Open
Abstract
Previous cross-sectional studies reported positive effects of meditation on the brain areas related to attention and executive function in the healthy elderly population. Effects of long-term regular meditation in persons with mild cognitive impairment (MCI) and Alzheimer's disease dementia (AD) have rarely been studied. In this study, we explored changes in cortical thickness and gray matter volume in meditation-naïve persons with MCI or mild AD after long-term meditation intervention. MCI or mild AD patients underwent detailed clinical and neuropsychological assessment and were assigned into meditation or non-meditation groups. High resolution T1-weighted magnetic resonance images (MRI) were acquired at baseline and after 6 months. Longitudinal symmetrized percentage changes (SPC) in cortical thickness and gray matter volume were estimated. Left caudal middle frontal, left rostral middle frontal, left superior parietal, right lateral orbitofrontal, and right superior frontal cortices showed changes in both cortical thickness and gray matter volume; the left paracentral cortex showed changes in cortical thickness; the left lateral occipital, left superior frontal, left banks of the superior temporal sulcus (bankssts), and left medial orbitofrontal cortices showed changes in gray matter volume. All these areas exhibited significantly higher SPC values in meditators as compared to non-meditators. Conversely, the left lateral occipital, and right posterior cingulate cortices showed significantly lower SPC values for cortical thickness in the meditators. In hippocampal subfields analysis, we observed significantly higher SPC in gray matter volume of the left CA1, molecular layer HP, and CA3 with a trend for increased gray matter volume in most other areas. No significant changes were found for the hippocampal subfields in the right hemisphere. Analysis of the subcortical structures revealed significantly increased volume in the right thalamus in the meditation group. The results of the study point out that long-term meditation practice in persons with MCI or mild AD leads to salutary changes in cortical thickness and gray matter volumes. Most of these changes were observed in the brain areas related to executive control and memory that are prominently at risk in neurodegenerative diseases.
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Affiliation(s)
- Madhukar Dwivedi
- Cognitive Science Lab, International Institute of Information Technology, Hyderabad, India
| | - Neha Dubey
- Department of Neurology, Apollo Gleneagles Hospital, Kolkata, India.,Department of Applied Psychology, University of Calcutta, Kolkata, India
| | - Aditya Jain Pansari
- Cognitive Science Lab, International Institute of Information Technology, Hyderabad, India
| | - Raju Surampudi Bapi
- Cognitive Science Lab, International Institute of Information Technology, Hyderabad, India
| | - Meghoranjani Das
- Department of Neurology, Apollo Gleneagles Hospital, Kolkata, India
| | - Maushumi Guha
- Department of Philosophy, Jadavpur University, Kolkata, India
| | - Rahul Banerjee
- Crystallography and Molecular Biology Division, Saha Institute of Nuclear Physics, Kolkata, India
| | | | - Jayanti Basu
- Department of Applied Psychology, University of Calcutta, Kolkata, India
| | - Amitabha Ghosh
- Department of Neurology, Apollo Gleneagles Hospital, Kolkata, India
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Chandraker S, Kaur J, Priya R, Dubey V, Dubey N. White light emission and thermoluminescence studies of Dy 3+ -activated hardystonite (Ca 2 ZnSi 2 O 7 ) phosphor. LUMINESCENCE 2021; 36:1507-1512. [PMID: 34048636 DOI: 10.1002/bio.4095] [Citation(s) in RCA: 1] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 05/24/2021] [Accepted: 05/25/2021] [Indexed: 11/12/2022]
Abstract
Here, we report the photoluminescence and thermoluminescent properties of Dy-activated Ca2 ZnSi2 O7 phosphors synthesized using the solid-state method. The synthesized phosphors showed hardystonite type structure, and had micron-sized particles. Fourier transform infrared spectroscopy (FTIR) showed the existence of the functional groups and confirmed the formation of phosphor and photoluminescence techniques. The phosphors under excitation at 239 nm exhibited green-yellow emission spectra in the region 481-575 nm corresponding to the 4 F9/2 →6 H15/2 and 4 F9/2 →6 H13/2 transitions of Dy3+ ions. The Commission Internationale de l'Eclairage (CIE) coordinates were achieved to be (0.25, 0.27), which was narrowly close to the white region. Thermoluminescence (TL) glow curve analysis of prepared Dy3+ -activated Ca2 ZnSi2 O7 phosphors were recorded for different ultraviolet (UV) light exposure times and found to have a linear response with dose. The TL glow curves, recorded with various UV exposure times ranging from 5 to 25 min, showed a linear response with dosage. The corresponding kinetic parameters were also calculated using a computerized glow curve deconvolution (CGCD) technique. Activation energy was observed to enhance the increase in the peak temperature and its value was substantially higher for the third peak fitted using CGCD. The obtained results indicated that the synthesized pristine phosphors could be potentially used for lighting, displays, and dosimetric applications.
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Affiliation(s)
- Siteshwari Chandraker
- Department of Physics, Govt. V.Y.T. Post Graduate Autonomous College Durg, Chhattisgarh, India
| | - Jagjeet Kaur
- Department of Physics, Govt. V.Y.T. Post Graduate Autonomous College Durg, Chhattisgarh, India
| | - Ruby Priya
- Department of Physics, University Institute of Sciences, Chandigarh University, Mohali, India
| | - Vikas Dubey
- Department of Physics, Bhilai Institute of Technology Raipur, Kendri, Raipur, India
| | - Neha Dubey
- Department of Physics, Govt. V.Y.T. Post Graduate Autonomous College Durg, Chhattisgarh, India
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Dubey N, Khan MZ, Kumar S, Sharma A, Das L, Bhaduri A, Singh Y, Nandicoori VK. Mycobacterium tuberculosis PPiA interacts with host integrin receptor to exacerbate disease progression. J Infect Dis 2021; 224:1383-1393. [PMID: 33580239 DOI: 10.1093/infdis/jiab081] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 02/05/2021] [Indexed: 11/14/2022] Open
Abstract
Attenuated intracellular survival of Mycobacterium tuberculosis (Mtb) secretory gene mutants exemplifies their role as virulence factors. Mtb peptidyl prolyl isomerase A (PPiA) assists in protein folding through cis/trans isomerization of prolyl bonds. Here, we show that PPiA abets Mtb survival and aids in the disease progression by exploiting host-associated factors. While the deletion of PPiA has no discernable effect on the bacillary survival in a murine infection model, it compromises the formation of granuloma-like lesions and promotes host cell death through ferroptosis. Overexpression of PPiA enhances the bacillary load and exacerbates pathology in mice lungs. Importantly, PPiA interacts with the integrin α5β1 receptor through a conserved surface-exposed RGD motif. The secretion of PPiA as well as interaction with integrin contributes to the disease progression by upregulating multiple host matrix metalloproteinases. Collectively, we identified a novel non-chaperone role of PPiA that is critical in facilitating host-pathogen interaction ensuing disease progression.
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Affiliation(s)
- Neha Dubey
- Department of Zoology, University of Delhi, Mall Road, Delhi, India.,Current Department of Molecular Microbiology, WUSTL, St. Louis, USA
| | - Mehak Zahoor Khan
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, India
| | - Suresh Kumar
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, India
| | - Aditya Sharma
- Department of Zoology, University of Delhi, Mall Road, Delhi, India.,Current Department of Pharmacological and Pharmaceutical Sciences, University of Houston, College of Pharmacy, Texas, USA
| | - Lahari Das
- CSIR-Institute of Genomics and Integrative Biology, Mall Road, Delhi, India.,Current Department of Pharmacological and Pharmaceutical Sciences, University of Houston, College of Pharmacy, Texas, USA
| | - Asani Bhaduri
- CSIR-Institute of Genomics and Integrative Biology, Mall Road, Delhi, India.,Current Cluster Innovation Center, University of Delhi, Mall Road, Delhi, India
| | - Yogendra Singh
- Department of Zoology, University of Delhi, Mall Road, Delhi, India
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Dubey N, Podder P, Pandey D. Knowledge of COVID-19 and Its Influence on Mindfulness, Cognitive Emotion Regulation and Psychological Flexibility in the Indian Community. Front Psychol 2020; 11:589365. [PMID: 33281687 PMCID: PMC7689361 DOI: 10.3389/fpsyg.2020.589365] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [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: 07/30/2020] [Accepted: 10/13/2020] [Indexed: 12/18/2022] Open
Abstract
The current global pandemic caused by COVID-19 has brought about an immense effect on the mental health of the general public. Considering the escalation in number of cases, mankind is facing a myriad of psychological problems, ranging from those related to taking precautions and maintaining safety to the ones caused by separation and bereavement. The current study aims to explore whether there is a significant difference between individuals with excellent, good, fair and vague knowledge of COVID-19 with respect to depression, anxiety, stress, level of mindfulness, specific cognitive emotion regulation strategies and psychological flexibility; to find out whether there is any significant relationship among these variables; and to determine whether knowledge of COVID-19, level of mindfulness, specific cognitive emotion regulation strategies and psychological flexibility are significant predictors of depression, anxiety and stress in the sample of the current study. The sample consisted of 402 individuals selected from the community following the research criteria. Data was collected using digital consent form, information schedule and questionnaires, from 3rd May to 13th May, 2020. The questionnaires consisted of a semi-structured interview schedule to assess knowledge of COVID-19, Depression, Anxiety and Stress Scale - 21, Five Facet Mindfulness Questionnaire-Short Form, Cognitive Emotion Regulation Questionnaire-Short version and Acceptance and Action Questionnaire-II. The data was statistically analyzed using analysis of variance test, correlational analysis and linear regression. The findings show that significant differences were present among individuals having varying degrees of knowledge of COVID-19 with respect to anxiety, level of mindfulness and psychological flexibility. Significant relationships were found to be present among the variables of the present study, having differing trends brought forward by the COVID-19 crisis. Certain socio-demographic characteristics and study variables were found to significantly predict the existing levels of depression, anxiety and stress in the current sample. The study suggests the necessity to formulate and implement appropriate mindfulness-based therapeutic interventions to address the mental health concerns arising as a result of the pandemic.
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Affiliation(s)
- Neha Dubey
- Department of Applied Psychology, University of Calcutta, Kolkata, India
- Apollo Gleneagles Hospitals, Kolkata, India
| | - Priyanka Podder
- Department of Psychology, University of Calcutta, Kolkata, India
- Mental Health Foundation, Kolkata, India
| | - Dinkar Pandey
- Department of Computer Science and Technology (CST), IIEST Shibpur, Howrah, India
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22
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Cheng-Lin G, Dubey V, Kushwah KK, Mishra MK, Pandey E, Tiwari R, Chandra A, Dubey N. Thermoluminescence Studies of β and γ-Irradiated Geological Materials for Environment Monitoring. J Fluoresc 2020; 30:819-825. [PMID: 32430863 DOI: 10.1007/s10895-020-02536-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 04/02/2020] [Indexed: 11/25/2022]
Abstract
In the present report, thermally stimulated luminescence (TSL) of quartz and limestone samples irradiated with β and γ-rays has been investigated. Herein the formation of trap depths and calculation of kinetic parameters of β and γ - irradiated quartz and limestone samples were studied through thermoluminescence (TL) glow curve analyses. The quartz and limestone samples were collected from various sites of Chhattisgarh (Patharia and Dalli-Rajhara mines). The collected raw samples were annealed at 400 °C. The phase formation of collected samples is confirmed by X-ray diffraction studies. The grain sizes of the samples are determined by using Debye-Scherrer formula. TL glow curves of the collected samples were recorded for various doses of β and γ-rays. Kinetic parameters such as order of kinetics frequency factor and trap depth were calculated by employing CGCD methods. A comparative study on the TL properties of the geological materials under β and γ-irradiation was done. The trap model analysis was executed to determine the nature of traps responsible for dominant TL peaks of β and γ-irradiated limestone and quartz samples.
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Affiliation(s)
- Gu Cheng-Lin
- Department of Environment, Faculty of Science, Jiamusi University, Jiamusi, 154007, China
| | - Vikas Dubey
- Department of Applied Physics; Bhilai Institute of Technology Raipur, Raipur, 493661, India.
| | - Kamal Kumar Kushwah
- Department of Applied Physics, Jabalpur Engineering College Jabalpur, Jabalpur, India
| | - Manish Kumar Mishra
- Department of Mechanical Engineering, Bhilai Institute of Technology Raipur, Raipur, 493661, India
| | - Ekta Pandey
- Department of Civil Engineering, Bhilai Institute of Technology Raipur, Raipur, 493661, India
| | - Ratnesh Tiwari
- Department of Applied Physics; Bhilai Institute of Technology Raipur, Raipur, 493661, India
| | - Angesh Chandra
- Department of Physics, Shri Shankaracharya Institute of Professional Management and Technology Raipur, Raipur, India
| | - Neha Dubey
- Department of Physics, Govt. V.Y.T.PG. Auto. College, Durg, 491001, India
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Singh N, Dubey N, Rathore M, Pandey P. Impact of early childhood caries on quality of life: Child and parent perspectives. J Oral Biol Craniofac Res 2020; 10:83-86. [PMID: 32181125 PMCID: PMC7062923 DOI: 10.1016/j.jobcr.2020.02.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2019] [Revised: 10/28/2019] [Accepted: 02/13/2020] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND The aim of present study was to examine early childhood caries' impact on oral health-related quality of life from children's self report and parental perception. METHODS 200 healthy children in the age group of 3-5 years and their parents/guardians were enrolled in the study. 100 children diagnosed with early childhood caries (interventional group) and 100 children without caries (control group) along with their parents/guardians participated in face to face interview and responded to Michigan oral health related quality of life scale - child and parent version. Four weeks after full mouth rehabilitation children with ECC and their parents responded to a survey for a follow-up assessment. Data was analyzed and evaluated using Statistical Package for Social Sciences Version 21.0 statistical software and Chi square test. RESULTS In our study we have found that ECC subjects had poorer oral health-related quality of life compared to caries free subjects. Further one month follow up after complete treatment, the oral health-related QoL improved significantly in ECC children. CONCLUSIONS Early childhood caries has a definite negative impact on the OHRQoL of children. At one month follow up after complete oral rehabilitation, the quality of life improved significanty as assessed by children's self reports as well as parental perceptions of their child's OHRQoL.
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Affiliation(s)
- Neerja Singh
- Department of Pediatric and Preventive Dentistry, Babu Banarasi Das College of Dental Sciences, Lucknow, India
| | | | - Monika Rathore
- Department of Pediatric and Preventive Dentistry, Babu Banarasi Das College of Dental Sciences, Lucknow, India
| | - Pallavi Pandey
- Department of Pediatric and Preventive Dentistry, Babu Banarasi Das College of Dental Sciences, Lucknow, India
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Dubey N. Assess the Effectiveness of Computer Assisted Teaching (CAT) on Knowledge gain about GCS with Coma Patient among B.Sc. Nursing 3rd YearStudents of Selected Nursing Colleges at Bhopal, Madhya Pradesh, India. ACTA ACUST UNITED AC 2019. [DOI: 10.24321/2348.2141.201901] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Sarkar R, Arsiwala S, Dubey N, Sonthalia S, Das A, Arya L, Gokhale N, Torsekar RG, Somani VK, Majid I, Godse K, Ravichandran G, Singh M, Aurangabadkar S, Salim T, Shah S, Sinha S. Chemical Peels in Melasma: A Review with Consensus Recommendations by Indian Pigmentary Expert Group. Indian J Dermatol 2017; 62:578-584. [PMID: 29263530 PMCID: PMC5724304 DOI: 10.4103/ijd.ijd_490_17] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Melasma is a notorious dermatosis, often resistant to treatment. Chemical peeling constitutes an acceptable option of management of melasma (of any type and duration). In this article, as a group of experts from Pigmentary Disorders Society (PDS) in collaboration with South Asian Pigmentary Forum (SPF), we have tried to elaborate the various chemical peeling agents for the treatment of melasma. Besides, we have reviewed the indications, mechanism of action, rationality and the detailed procedure of peeling. The evidence in favor of various peeling agents have been summarized as well.
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Affiliation(s)
- Rashmi Sarkar
- Dermatology, Maulana Azad Medical College and Lok Nayak Hospital, New Delhi, India
| | - Shehnaz Arsiwala
- Consultant Dermatologist, Saifee Hospital, Prince Aly Khan Hospital, Mumbai, India
| | - Neha Dubey
- Consultant Dermatologist, Medanta Hospital, Gurgaon, Haryana, India
| | - Sidharth Sonthalia
- Consultant Dermatologist, Skinnocence: The Skin Clinic, Gurgaon, Haryana, India
| | - Anupam Das
- Dermatology, KPC Medical College and Hospital, Kolkata, West Bengal, India
| | - Latika Arya
- Consultant Dermatologist, L A Skin and Aesthetic Clinic, New Delhi, India
| | - Narendra Gokhale
- Consultant Dermatologist, Sklinic Skin Clinic, Indore, Madhya Pradesh, India
| | - R G Torsekar
- Consultant Dermatologist, Fortis Hospital, Mulund, Mumbai, India
| | - V K Somani
- Consultant Dermatologist, Skintrendz, Himayat Nagar, Hyderabad, India
| | - Imran Majid
- Dermatology, Govt Medical College, Srinagar, Kashmir, India
| | - Kiran Godse
- Dermatology, D Y Patil Hospital, Navi Mumbai, India
| | - G Ravichandran
- Senior Consultant and Coordinator, Dermatology, Apollo Hospitals, Chennai, India
| | - Mohan Singh
- Consultant Dermatologist, Mohan Skin Diseases Hospital, Phagwara, Punjab, India
| | | | - T Salim
- Consultant Dermatologist, Cutis institute of Dermatology and Aesthetic Sciences, Calicut, Kerala, India
| | - Swapnil Shah
- Consultant Dermatologist, Solapur, Maharashtra, India
| | - Surabhi Sinha
- Dermatologist Specialist, Dr RML Hospital and PGIMS, New Delhi, India
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Abstract
The induced pluripotent stem cells (iPSCs) have an intrinsic capability for indefinite self-renewal and large-scale expansion and can differentiate into all types of cells. Here, we tested the potential of iPSCs from dental pulp stem cells (DPSCs) to differentiate into functional odontoblasts. DPSCs were reprogrammed into iPSCs via electroporation of reprogramming factors OCT-4, SOX2, KLF4, LIN28, and L-MYC. The iPSCs presented overexpression of the reprogramming genes and high protein expressions of alkaline phosphatase, OCT4, and TRA-1-60 in vitro and generated tissues from 3 germ layers in vivo. Dentin discs with poly-L-lactic acid scaffolds containing iPSCs were implanted subcutaneously into immunodeficient mice. After 28 d from implantation, the iPSCs generated a pulp-like tissue with the presence of tubular dentin in vivo. The differentiation potential after long-term expansion was assessed in vitro. iPSCs and DPSCs of passages 4 and 14 were treated with either odontogenic medium or extract of bioactive cement for 28 d. Regardless of the passage tested, iPSCs expressed putative markers of odontoblastic differentiation and kept the same mineralization potential, while DPSC P14 failed to do the same. Analysis of these data collectively demonstrates that human iPSCs can be a source to derive human odontoblasts for dental pulp research and test bioactivity of materials.
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Affiliation(s)
- H. Xie
- Oral Sciences, Faculty of Dentistry, National University of Singapore, Singapore
| | - N. Dubey
- Oral Sciences, Faculty of Dentistry, National University of Singapore, Singapore
| | - W. Shim
- National Heart Research Institute Singapore, National Heart Centre Singapore, Singapore
- Cardiovascular and Metabolic Disorders Program, Duke-NUS Medical School, Singapore
| | - C.J.A. Ramachandra
- National Heart Research Institute Singapore, National Heart Centre Singapore, Singapore
| | - K.S. Min
- Department of Conservative Dentistry, School of Dentistry and Institute of Oral Bioscience, Chonbuk National University, Jeonju, Korea
| | - T. Cao
- Oral Sciences, Faculty of Dentistry, National University of Singapore, Singapore
| | - V. Rosa
- Oral Sciences, Faculty of Dentistry, National University of Singapore, Singapore
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Sharma AK, Dhasmana N, Dubey N, Kumar N, Gangwal A, Gupta M, Singh Y. Bacterial Virulence Factors: Secreted for Survival. Indian J Microbiol 2016; 57:1-10. [PMID: 28148975 DOI: 10.1007/s12088-016-0625-1] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Accepted: 10/03/2016] [Indexed: 12/29/2022] Open
Abstract
Virulence is described as an ability of an organism to infect the host and cause a disease. Virulence factors are the molecules that assist the bacterium colonize the host at the cellular level. These factors are either secretory, membrane associated or cytosolic in nature. The cytosolic factors facilitate the bacterium to undergo quick adaptive-metabolic, physiological and morphological shifts. The membrane associated virulence factors aid the bacterium in adhesion and evasion of the host cell. The secretory factors are important components of bacterial armoury which help the bacterium wade through the innate and adaptive immune response mounted within the host. In extracellular pathogens, the secretory virulence factors act synergistically to kill the host cells. In this review, we revisit the role of some of the secreted virulence factors of two human pathogens: Mycobacterium tuberculosis-an intracellular pathogen and Bacillus anthracis-an extracellular pathogen. The advances in research on the role of secretory factors of these pathogens during infection are discussed.
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Affiliation(s)
- Aditya Kumar Sharma
- CSIR-Institute of Genomics and Integrative Biology, Mall Road, Delhi, 110007 India.,Academy of Scientific and Innovative Research (AcSIR), 2, Rafi Marg, Anusandhan Bhawan, New Delhi, 110001 India
| | - Neha Dhasmana
- CSIR-Institute of Genomics and Integrative Biology, Mall Road, Delhi, 110007 India.,Academy of Scientific and Innovative Research (AcSIR), 2, Rafi Marg, Anusandhan Bhawan, New Delhi, 110001 India
| | - Neha Dubey
- Department of Zoology, University of Delhi, Delhi, 110007 India
| | - Nishant Kumar
- CSIR-Institute of Genomics and Integrative Biology, Mall Road, Delhi, 110007 India.,Academy of Scientific and Innovative Research (AcSIR), 2, Rafi Marg, Anusandhan Bhawan, New Delhi, 110001 India
| | - Aakriti Gangwal
- CSIR-Institute of Genomics and Integrative Biology, Mall Road, Delhi, 110007 India
| | - Meetu Gupta
- CSIR-Institute of Genomics and Integrative Biology, Mall Road, Delhi, 110007 India
| | - Yogendra Singh
- CSIR-Institute of Genomics and Integrative Biology, Mall Road, Delhi, 110007 India.,Department of Zoology, University of Delhi, Delhi, 110007 India
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Affiliation(s)
- Vivek Kumar Dey
- Department of Dermatology, People's College of Medical Sciences and Research Centre, Bhopal, Madhya Pradesh, India
| | - Tanvi Singh Bhadoria
- Department of Dermatology, People's College of Medical Sciences and Research Centre, Bhopal, Madhya Pradesh, India
| | - Animesh Saxena
- Department of Dermatology, People's College of Medical Sciences and Research Centre, Bhopal, Madhya Pradesh, India
| | - Avtar Kishan Jaisinghani
- Department of Dermatology, People's College of Medical Sciences and Research Centre, Bhopal, Madhya Pradesh, India
| | - Anjali Y Patil
- Department of Dermatology, People's College of Medical Sciences and Research Centre, Bhopal, Madhya Pradesh, India
| | - Neha Dubey
- Department of Dermatology, People's College of Medical Sciences and Research Centre, Bhopal, Madhya Pradesh, India
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29
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Rosa V, Madanagopal T, Dubey N, Gomes JCV. Graphene as a substrate to enhance neurogenic differentiation of DPSC. Dent Mater 2016. [DOI: 10.1016/j.dental.2016.08.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Dey V, Thawani M, Dubey N. Accuracy and reliability of Tzanck test compared to histopathology for diagnosis of basal cell carcinoma. Indian J Dermatopathol Diagn Dermatol 2015. [DOI: 10.4103/2349-6029.160980] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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31
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Shukla P, Lemley C, Dubey N, Meyer A, O'Rourke S, Vonnahme K. Effect of maternal nutrient restriction and melatonin supplementation from mid to late gestation on vascular reactivity of maternal and fetal placental arteries. Placenta 2014; 35:461-6. [DOI: 10.1016/j.placenta.2014.04.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2013] [Revised: 04/12/2014] [Accepted: 04/16/2014] [Indexed: 10/25/2022]
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32
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Bhaduri A, Misra R, Maji A, Bhetaria PJ, Mishra S, Arora G, Singh LK, Dhasmana N, Dubey N, Virdi JS, Singh Y. Mycobacterium tuberculosis cyclophilin A uses novel signal sequence for secretion and mimics eukaryotic cyclophilins for interaction with host protein repertoire. PLoS One 2014; 9:e88090. [PMID: 24505389 PMCID: PMC3913756 DOI: 10.1371/journal.pone.0088090] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2013] [Accepted: 01/03/2014] [Indexed: 11/19/2022] Open
Abstract
Cyclophilins are prolyl isomerases with multitude of functions in different cellular processes and pathological conditions. Cyclophilin A (PpiA) of Mycobacterium tuberculosis is secreted during infection in intraphagosomal niche. However, our understanding about the evolutionary origin, secretory mechanism or the interactome of M. tuberculosis PpiA is limited. This study demonstrates through phylogenetic and structural analyses that PpiA has more proximity to human cyclophilins than the prokaryotic counterparts. We report a unique N-terminal sequence (MADCDSVTNSP) present in pathogenic mycobacterial PpiA and absent in non-pathogenic strains. This sequence stretch was shown to be essential for PpiA secretion. The overexpression of full-length PpiA from M. tuberculosis in non-pathogenic Mycobacterium smegmatis resulted in PpiA secretion while truncation of the N-terminal stretch obstructed the secretion. In addition, presence of an ESX pathway substrate motif in M. tuberculosis PpiA suggested possible involvement of Type VII secretion system. Site-directed mutagenesis of key residues in this motif in full-length PpiA also hindered the secretion in M. smegmatis. Bacterial two-hybrid screens with human lung cDNA library as target were utilized to identify interaction partners of PpiA from host repertoire, and a number of substrates with functional representation in iron storage, signal transduction and immune responses were detected. The extensive host interactome coupled with the sequence and structural similarity to human cyclophilins is strongly suggestive of PpiA being deployed by M. tuberculosis as an effector mimic against the host cyclophilins.
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Affiliation(s)
- Asani Bhaduri
- CSIR-Institute of Genomics and Integrative Biology, Delhi, India
- Department of Microbiology, University of Delhi, Delhi, India
| | - Richa Misra
- CSIR-Institute of Genomics and Integrative Biology, Delhi, India
| | - Abhijit Maji
- CSIR-Institute of Genomics and Integrative Biology, Delhi, India
| | | | - Sonakshi Mishra
- CSIR-Institute of Genomics and Integrative Biology, Delhi, India
| | - Gunjan Arora
- CSIR-Institute of Genomics and Integrative Biology, Delhi, India
| | | | - Neha Dhasmana
- CSIR-Institute of Genomics and Integrative Biology, Delhi, India
| | - Neha Dubey
- CSIR-Institute of Genomics and Integrative Biology, Delhi, India
| | | | - Yogendra Singh
- CSIR-Institute of Genomics and Integrative Biology, Delhi, India
- * E-mail: mail:
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Paliwal N, Jain P, Dubey N, Sharma S, Khurana S, Kumar Paliwal S. A liquid chromatography tandem mass spectrometry based regulatory compliant method for the determination of tenofovir in human serum. Drug Res (Stuttg) 2013; 64:306-12. [PMID: 24310362 DOI: 10.1055/s-0033-1361090] [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: 10/25/2022]
Abstract
A simple, rapid, and specific assay based on solid phase extraction and liquid chromatography-electrospray ionization tandem mass spectrometry (LC-ESI MS-MS) for the quantitative analysis of Tenofovir in human serum using Tenofovir D6 as internal standard (IS) have been developed. The precursor to product ion transitions of m/z 288.2/176.2 and m/z 293.9/182.3 used to measure the analyte and internal standard (Tenofovir and Tenofovir D6). The method was validated over a concentration range of 5.06-603.72 ng mL(-1). The method was validated over the parameters like selectivity, matrix effect, sensitivity, linearity, precision, accuracy, various stabilities (bench top stability, standard stock solution stability in refrigerator and at room temperature, stock dilution stability, auto sampler stability, freeze thaw stability, long term stability - 65°C±10°C & long term stability - 22°C±5°C, reagent stability, dry extract stability, wet extract stability in refrigerator and at bench top, blood stability), effect of potentially interfering drugs, dilution integrity, recovery and reinjection reproducibility. The mean % recovery of Tenofovir was 98.22% with a precision of 2.42%, The mean % recovery of Tenofovir D6 was 100.96% with a precision of 2.88%. The RSD % of intra-day and inter-day assay was≤15%.
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Affiliation(s)
| | - P Jain
- Jubilant Clinsys Ltd, Noida, India
| | - N Dubey
- Jubilant Clinsys Ltd, Noida, India
| | - S Sharma
- Jubilant Clinsys Ltd, Noida, India
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35
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Lal B, Dubey N. Existence of a nitric oxide synthase/nitric oxide system in fish testis and its role in modulation of androgenesis. Fish Physiol Biochem 2013; 39:65-69. [PMID: 22565666 DOI: 10.1007/s10695-012-9648-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2011] [Accepted: 04/19/2012] [Indexed: 05/31/2023]
Abstract
Fish testis is equipped with different isoforms of nitric oxide synthase (NOSs) and is capable of producing nitric oxide (NO). Cellular sources of NO in the catfish testis are germ cells, Leydig cells, and macrophages. Production of testicular NO is under endocrine inhibitory control. Expression of NOSs exhibits seasonality and that depends on the reproductive status of fish. Leydig cells are highly sensitive to chemical as well as biological NO. NO inhibits testosterone production by the testis in vivo as well as by the isolated Leydig cells in vitro.
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Affiliation(s)
- B Lal
- Department of Zoology, Banaras Hindu University, Varanasi, 221 005, India.
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36
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Chandra A, Tiwari KK, Nagaich D, Dubey N, Kumar S, Roy AK. Development and characterization of microsatellite markers from tropical forage Stylosanthes species and analysis of genetic variability and cross-species transferability. Genome 2011; 54:1016-28. [PMID: 22088085 DOI: 10.1139/g11-064] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A limited number of functional molecular markers has slowed the desired genetic improvement of Stylosanthes species. Hence, in an attempt to develop simple sequence repeat (SSR) markers, genomic libraries from Stylosanthes seabrana B.L. Maass & 't Mannetje (2n=2x=20) using 5' anchored degenerate microsatellite primers were constructed. Of the 76 new microsatellites, 21 functional primer pairs were designed. Because of the small number of primer pairs designed, 428 expressed sequence tag (EST) sequences from seven Stylosanthes species were also examined for SSR detection. Approximately 10% of sequences delivered functional primer pairs, and after redundancy elimination, 57 microsatellite repeats were selected. Tetranucleotides followed by trinucleotides were the major repeated sequences in Stylosanthes ESTs. In total, a robust set of 21 genomic-SSR (gSSR) and 20 EST-SSR (eSSR) markers were developed. These markers were analyzed for intraspecific diversity within 20 S. seabrana accessions and for their cross-species transferability. Mean expected (He) and observed (Ho) heterozygosity values with gSSR markers were 0.64 and 0.372, respectively, whereas with eSSR markers these were 0.297 and 0.214, respectively. Dendrograms having moderate bootstrap value (23%-94%) were able to distinguish all accessions of S. seabrana with gSSR markers, whereas eSSR markers showed 100% similarities between few accessions. The set of 21 gSSRs, from S. seabrana, and 20 eSSRs, from selected Stylosanthes species, with their high cross-species transferability (45% with gSSRs, 86% with eSSRs) will facilitate genetic improvement of Stylosanthes species globally.
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Affiliation(s)
- Amaresh Chandra
- Crop Improvement Division, Indian Grassland and Fodder Research Institute, Jhansi-284003, India.
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37
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Adhikari M, Arora R, Chawla R, Sharma J, Dhaker AS, Gupta D, Dubey N, Kumar R, Ivanov V, Gadjeva V, Gevrenova R, Sharma RK. Evaluation of silymarin as a promising radioprotector. Z NATURFORSCH C 2010; 65:337-46. [PMID: 20653235 DOI: 10.1515/znc-2010-5-605] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023]
Abstract
Silymarin, a purified extract of seeds of Silybum marianum L. and well known for its hepatoprotective abilities, has been evaluated for inherent utility as a radioprotective agent. A fraction (INM-7035) was authenticated by characterizing the percentage composition of silybin A and B (39.9% and 57.4%). Free radical scavenging activities of INM-7035 against superoxide radicals (>68%), hydroxyl radicals (>33.75%), DPPH (67.2%), and ABTS (32.4%) were also evaluated. The fraction chelated (>30%) ferrous ions, thereby able to restrict amplification. INM-7035 exhibited >50% peroxyl radical scavenging activity in the lipid phase along with dose-dependent (R2 = 0.990) reducing power in the aqueous phase. Radiation-induced free radical flux can lead to disruption of biomolecules like membrane lipids. INM-7035 completely inhibited lipid peroxidative stress in case of membranes against supralethal radiation stress in the liposomal system. The ability of INM-7035 to modulate the levels of NF-kappaB, indicated its inherent potential as a radioprotective bioactive constituent.
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Affiliation(s)
- Manish Adhikari
- Institute of Nuclear Medicine and Allied Sciences, Brig SK Mazumdar Marg, Delhi-110054, India
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Moey T, Peh W, Clarke M, Dubey N, Cheng A. Erratum to: Radiological features of complications of laparoscopic adjustable gastric banding. Radiol Med 2009. [DOI: 10.1007/s11547-009-0460-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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39
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Chawla R, Sharma RK, Madaan D, Dubey N, Arora R, Goel R, Singh S, Kaushik V, Singh PK, Chabbra V, Bhardwaj JR. Mitigation approaches to combat the flu pandemic. J Glob Infect Dis 2009; 1:117-30. [PMID: 20300402 PMCID: PMC2840954 DOI: 10.4103/0974-777x.56258] [Citation(s) in RCA: 5] [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] [Indexed: 11/04/2022] Open
Abstract
Management of flu pandemic is a perpetual challenge for the medical fraternity since time immemorial. Animal to human transmission has been observed thrice in the last century within an average range of 11-39 years of antigenic recycling. The recent outbreak of influenza A (H1N1, also termed as swine flu), first reported in Mexico on April 26, 2009, occurred in the forty first year since last reported flu pandemic (July 1968). Within less than 50 days, it has assumed pandemic proportions (phase VI) affecting over 76 countries with 163 deaths/35,928 cases (as on 15(th) June 2009). It indicated the re-emergence of genetically reassorted virus having strains endemic to humans, swine and avian (H5N1). The World Health Organisation (WHO) member states have already pulled up their socks and geared up to combat such criticalities. Earlier outbreaks of avian flu (H5N1) in different countries led WHO to develop pandemic preparedness strategies with national/regional plans on pandemic preparedness. Numerous factors related to climatic conditions, socio-economic strata, governance and sharing of information/logistics at all levels have been considered critical indicators in monitoring the dynamics of escalation towards a pandemic situation.The National Disaster Management Authority (NDMA), Government of India, with the active cooperation of UN agencies and other stakeholders/experts has formulated a concept paper on role of nonhealth service providers during pandemics in April 2008 and released national guidelines - management of biological disasters in July 2008. These guidelines enumerate that the success of medical management endeavors like pharmaceutical (anti-viral Oseltamivir and Zanamivir therapies), nonpharmaceutical interventions and vaccination development etc., largely depends on level of resistance offered by mutagenic viral strain and rationale use of pharmaco therapeutic interventions. This article describes the mitigation approach to combat flu pandemic with its effective implementation at national, state and local levels.
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Affiliation(s)
- Raman Chawla
- Division of CBRN Defense, Institute of Nuclear Medicine and Allied Sciences, Brig SK Mazumdar Marg, Delhi - 110 054, India
| | - Rakesh Kumar Sharma
- Division of CBRN Defense, Institute of Nuclear Medicine and Allied Sciences, Brig SK Mazumdar Marg, Delhi - 110 054, India
| | - Deepali Madaan
- High Throughput Screening Lab, Jubilant Biosys Ltd, “Jubilant Discovery Center”, #92, Industrial Suburb, 2 Stage, Industrial Area, Yeshwantpur, Bangalore - 560 022, India
| | - Neha Dubey
- Division of CBRN Defense, Institute of Nuclear Medicine and Allied Sciences, Brig SK Mazumdar Marg, Delhi - 110 054, India
| | - Rajesh Arora
- Division of CBRN Defense, Institute of Nuclear Medicine and Allied Sciences, Brig SK Mazumdar Marg, Delhi - 110 054, India
| | - Rajeev Goel
- Division of CBRN Defense, Institute of Nuclear Medicine and Allied Sciences, Brig SK Mazumdar Marg, Delhi - 110 054, India
| | - Shefali Singh
- Division of CBRN Defense, Institute of Nuclear Medicine and Allied Sciences, Brig SK Mazumdar Marg, Delhi - 110 054, India
| | - Vinod Kaushik
- Division of CBRN Defense, Institute of Nuclear Medicine and Allied Sciences, Brig SK Mazumdar Marg, Delhi - 110 054, India
| | - Pankaj Kumar Singh
- National Disaster Management Authority, NDMA Bhawan, A-1, Safdarjung Enclave, Delhi - 110 029, India
| | - Vivek Chabbra
- National Disaster Management Authority, NDMA Bhawan, A-1, Safdarjung Enclave, Delhi - 110 029, India
| | - Janak Raj Bhardwaj
- National Disaster Management Authority, NDMA Bhawan, A-1, Safdarjung Enclave, Delhi - 110 029, India
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Dai A, Wasay M, Dubey N, Giglio P, Bakshi R. Superior sagittal sinus thrombosis secondary to hyperthyroidism. J Stroke Cerebrovasc Dis 2007; 9:89-90. [PMID: 17895204 DOI: 10.1053/jscd.2000.0090089] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/1999] [Accepted: 09/15/1999] [Indexed: 11/11/2022] Open
Abstract
Superior sagittal sinus thrombosis (SSST) is associated with a variety of hypercoaguable states. Although coagulation disturbances are reported in hyperthyroidism, a direct link between hyperthyroidism and cerebral venous thrombosis is not established. We report a 39-year-old man who developed increased intracranial pressure, seizures, and rapid atrial fibrillation. Neuroimaging showed SSST, and laboratory studies were consistent with hyperthyroidism. No other causes of a hypercoaguable state were identified. Prompt treatment of his hyperthyroidism led to recanalization of the superior sagittal sinus and a full neurological recovery. Given the known effects of hyperthyroidism on factor VIII activity, we hypothesize that hyperthyroidism is an independent risk factor for SSST. A high index of suspicion for SSST is warranted in patients with hyperthyroidism and neurological symptoms. Furthermore, thyroid dysfunction should be excluded in patients with unexplained SSST.
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Affiliation(s)
- A Dai
- Department of Neurology, State University of New York at Buffalo, Buffalo, NY, USA
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Kishore K, Sinha SK, Kumar R, Gupta NC, Dubey N, Sachdev A. Isolation and characterization of microsomal omega-6-desaturase gene (fad2-1) from soybean. Indian J Exp Biol 2007; 45:390-7. [PMID: 17477313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
A genomic DNA sequence (fad2-1) encoding seed specific microsomal 0-6 desaturase was isolated from soybean (Glycine max. L cv. Pusa-9702). A positive genomic clone of 1852 nucleotides containing a single uninterrupted 3' end exonic region with an ORF of 1140 bp encoding a peptide of 379 amino acids, a complete 3' UTR of 206 bp and 86 bp of 5' UTR interrupted by a single intron of 420 bp was obtained on screening the sub-genomic library of soybean. Southern blots revealed at least two copies of the gene per haploid genome. Analysis of the translated product showed the presence of three histidine boxes, with the general sequence HXXXH and five probable transmembrane segments reported to be involved in substrate specificity.
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Affiliation(s)
- K Kishore
- Division of Biochemistry, Indian Agricultural Research Institute, New Delhi 110 012, India
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Dubey N, Trivedi SS, Pasrija S. Copper intrauterine devices in the management of secondary amenorrhea. Int J Gynaecol Obstet 2006; 95:159-60. [PMID: 16781716 DOI: 10.1016/j.ijgo.2006.04.032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2006] [Revised: 04/03/2006] [Accepted: 04/05/2006] [Indexed: 11/22/2022]
Affiliation(s)
- N Dubey
- Lady Hardinge Medical College and Smt. Sucheta Kriplani Hospital, New Delhi, India
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Dhaliwal M, Dubey N. India--workshops on "HIV/AIDS: the law and ethics". Can HIV AIDS Policy Law Newsl 2002; 5:84-6, 91-4. [PMID: 11833211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
The Lawyers Collective HIV/AIDS Unit is a non-governmental organization providing legal aid, advice, and support to people with HIV/AIDS in India. This article summarizes a series of workshops on "HIV/AIDS: The Law and Ethics" organized by the Unit to empower people with HIV/AIDS and educate the Indian judiciary.
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45
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Mishra M, Dubey N, Totey SM, Bhat KV, Babu S, Awasthi-Kalia M, Anand RK. Phylogenetic relationships and genetic polymorphisms in wild Indian mice. Biomol Eng 2002; 18:281-8. [PMID: 11841950 DOI: 10.1016/s1389-0344(01)00112-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Randomly amplified polymorphic DNA (RAPD) analysis was used to examine the extent of variability in 11 Indian wild derived commensal house mice (Mus musculus) populations and compared with inbred strains of musculus and domesticus subspecies as well as commonly used laboratory inbred strains C57BL/6J and DBA/2J. Arbitrary designed 10 mer oligonucleotide primers with 60-70% (G+C) content were used to amplify DNA template. Out of 52 primers screened initially on the laboratory strains, 20 were selected for analysis on the basis of amplification product in the size range of 200-1400 bp. Among 353 total polymorphic bands, 220 bands (64%) were found to be polymorphic in Indian wild mice, 85 bands (25%) in wild derived inbred strains and 37 bands (11%) in laboratory mice strains. The amplification patterns produced by primers were statistically analysed by Jaccard's similarity coefficient the value of which ranged from 0.56 to 0.80. High level of genetic diversity was seen in the Indian wild mice populations as compared to the controls. The UPGMA phenogram grouped mice population into two major clusters except Bikaner [BIK], Bilaspur [BIL] and Ranikhet [RK] populations which were placed outside the close-knit clusters. Inspite of low values of bootstrap estimates obtained by Wagner and Dollo parsimony analysis, the results were comparable with UPGMA phenogram when constitution of the populations in the major cluster was considered. Indian mice populations appeared to be diverse from laboratory inbred mice strains.
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Affiliation(s)
- M Mishra
- National Institute of Immunology, Aruna Asaf Ali Marg, 110 067, New Delhi, India
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Wasay M, Bakshi R, Kojan S, Bobustuc G, Dubey N, Unwin DH. Nonrandomized comparison of local urokinase thrombolysis versus systemic heparin anticoagulation for superior sagittal sinus thrombosis. Stroke 2001; 32:2310-7. [PMID: 11588319 DOI: 10.1161/hs1001.096192] [Citation(s) in RCA: 113] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND AND PURPOSE We sought to compare the safety and efficacy of direct urokinase thrombolysis with systemic heparin anticoagulation for superior sagittal sinus thrombosis (SSST). METHODS At University at Buffalo (NY) and University of Texas (Dallas, Houston), we reviewed 40 consecutive patients with SSST, treated with local urokinase (thrombolysis group) or systemic heparin anticoagulation (heparin group). The thrombolysis group (n=20) received local urokinase into the SSS followed by systemic heparin anticoagulation. The heparin group (n=20) received systemic heparin anticoagulation only. Neurological dysfunction was rated as follows: 0, normal; 1, mild (but able to ambulate and communicate); 2, moderate (unable to ambulate, normal mentation); and 3, severe (unable to ambulate, altered mentation). RESULTS Age (P=0.49), sex (P=0.20), baseline venous infarction (P=0.73), and predisposing illnesses (P=0.52) were similar between the thrombolysis and heparin groups. Pretreatment neurological function was worse in the thrombolysis group (normal, n=5; mild, n=8; moderate, n=4; severe, n=3) than in the heparin group (normal, n=8; mild, n=8; moderate, n=3; severe, n=1) (P=NS). Discharge neurological function was better in the thrombolysis group (normal, n=16; mild, n=3; moderate, n=1; severe, n=0) than in the heparin group (normal, n=9; mild, n=6; moderate, n=5; severe, n=0) (P=0.019, Mann-Whitney U test). Hemorrhagic complications were 10% (n=2) in the thrombolysis group (subdural hematoma, retroperitoneal hemorrhage) and none in the heparin group (P=0.49). Three of the heparin group patients developed complications of the underlying disease (status epilepticus, hydrocephalus, refractory papilledema). No deaths occurred. Length of hospital stay was similar between the groups (P=0.79). CONCLUSIONS Local thrombolysis with urokinase is fairly well tolerated and may be more effective than systemic heparin anticoagulation alone in treating SSST. A randomized, prospective study comparing these 2 treatments for SSST is warranted.
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Affiliation(s)
- M Wasay
- Department of Neurology, Aga Khan University, Karachi, Pakistan
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Dubey N, Letourneau PC, Tranquillo RT. Neuronal contact guidance in magnetically aligned fibrin gels: effect of variation in gel mechano-structural properties. Biomaterials 2001; 22:1065-75. [PMID: 11352087 DOI: 10.1016/s0142-9612(00)00341-0] [Citation(s) in RCA: 108] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Neurite outgrowth from chick dorsal root ganglia entrapped in isotropic and magnetically aligned fibrin gels was studied, and the dependence on the diameter of the fibrin fibrils was characterized. The fibrin fibril diameter was varied, as inferred from turbidity measurements, by using different Ca2+ concentrations in the fibrin-forming solution, but this variation was accomplished without affecting the degree of magnetic-induced alignment, as directly visualized in fluorescently spiked gels. Magnetically aligned fibrin gels possessing different fibril diameters but similar alignment resulted in drastic changes in the contact guidance response of neurites, with no response in gels formed in 1.2 mM Ca2+ (having smaller fibril diameter, ca. 150 nm), but a strong response in gels formed in 12 and 30 mM Ca2+ (having larger fibril diameter, ca. 510 nm) with an attendant two-fold increase in neurite length. These changes are attributed to variation of the mechano-structural properties of the network of aligned fibrils as the fibril diameter is varied.
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Affiliation(s)
- N Dubey
- Department of Chemical Engineering & Materials Science, University of Minnesota, Minneapolis 55455, USA
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Dubey N, Bakshi R, Wasay M, Dmochowski J. Early computed tomography hypodensity predicts hemorrhage after intravenous tissue plasminogen activator in acute ischemic stroke. J Neuroimaging 2001; 11:184-8. [PMID: 11296590 DOI: 10.1111/j.1552-6569.2001.tb00031.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Parenchymal hypodensity is a proposed risk factor for hemorrhage after recombinant tissue plasminogen activator (TPA) thrombolysis for ischemic stroke. In Buffalo, NY, and Houston, TX, the authors reviewed 70 patients who were treated with intravenous TPA for acute middle cerebral artery (MCA) stroke. Two observers blinded to clinical outcome analyzed initial noncontrast head computed tomography (CT) scans. Basal ganglia CT hypodensity was quantitated in Hounsfield units (HUs). Contralateral-ipsilateral difference in density was calculated using the asymptomatic side as a control. Ictus time to TPA averaged 2.5 hours. Six patients developed symptomatic intraparenchymal hematomas (2 fatal). The hemorrhage group had more severe basal ganglia hypodensity (mean 7.5 +/- 1.4, range 6-10 HU) than the nonhemorrhage group (2.2 +/- 1.4, range 0-9 HU) (P < .0001). The hemorrhage group had hypodensity of > 5 HU; the nonhemorrhage group had hypodensity of < or = 4 HU, except 1 patient with hypodensity of 9 HU. In predicting hemorrhage, the positive predictive value of hypodensity > 5 HU was 86%; the negative predictive value was 100%. Prethrombolysis NIH Stroke Scale (NIHSS) deficit (P = .0007) and blood glucose (P = .005) were also higher in the hemorrhage group. Age, gender, smoking, hypertension, and ictus time to TPA infusion did not differ between the 2 groups. Logistic regression indicated that basal ganglia hypodensity was the best single predictor of hemorrhage. Hypodensity and NIHSS score together predicted all cases of hemorrhage. The authors conclude that basal ganglia hypodensity quantified by CT may be a useful method of risk stratification to select acute MCA stroke patients for thrombolytic therapy.
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Affiliation(s)
- N Dubey
- Department of Neurology, University of Texas at Houston, Texas, USA
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Bakshi R, Shaikh ZA, Miletich RS, Czarnecki D, Dmochowski J, Henschel K, Janardhan V, Dubey N, Kinkel PR. Fatigue in multiple sclerosis and its relationship to depression and neurologic disability. Mult Scler 2000; 6:181-5. [PMID: 10871830 DOI: 10.1177/135245850000600308] [Citation(s) in RCA: 320] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
We studied multiple sclerosis fatigue (MSF) and its relationship to depression and disability. Seventy-one patients [50 relapsing-remitting, 21 secondary progressive] were grouped by Fatigue Severity Scale (FSS) into MS-fatigue (MSF) (FSS>/=5; n=46) or MS-nonfatigue (MSNF) (FSS</=4; n=20). Forty-one patients were grouped into MS-depression (MSD) (n=15) or MS-nondepression (MSND) (n=26) by interview. Higher expanded disability status scale (EDSS) scores were noted in MSF than MSNF patients (P=0.0003); EDSS scores correlated with FSS scores (rho=0.43, P=0.003). However, fatigue was present in 58% (n=29) of relapsing-remitting patients and in 52% (n=26) of patients with mild physical disability (EDSS<3.5). Hamilton/Beck depression severity scores were higher in MSF than MSNF patients and correlated with FSS scores (P<0.05). MSD had higher FSS scores than MSND patients (P=0.008). After controlling for EDSS, depression severity continued to correlate with FSS scores (rho=0.37, P=0.02). After controlling for depression, FSS scores no longer correlated with EDSS scores (rho=0.27, P=0.09). Thus, MSF is independent of physical disability, but is associated with depression, suggesting that common mechanisms play a role in MSF and MSD including psychological factors or brain lesions in specific neuroanatomic pathways. Further study is warranted to determine if antidepressant medications improve fatigue in MS.
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Affiliation(s)
- R Bakshi
- Dent Neurologic Institute, Kaleida Health-Millard Fillmore Hospital, State University of New York at Buffalo School of Medicine and Biomedical Sciences, USA
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Bakshi R, Shaikh Z, Miletich R, Czarnecki D, Dmochowski J, Henschel K, Janardhan V, Dubey N, Kinkel P. Fatigue in multiple sclerosis and its relationship to depression and neurologic disability. ACTA ACUST UNITED AC 2000. [DOI: 10.1191/135245800701566052] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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