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Ghosh Laskar S, Sinha S, Kumar A, Samanta A, Mohanty S, Kale S, Khan F, Lewis Salins S, Murthy V. Reducing Salivary Toxicity with Adaptive Radiotherapy (ReSTART): A Randomized Controlled Trial Comparing Conventional IMRT to Adaptive IMRT in Head and Neck Squamous Cell Carcinomas. Clin Oncol (R Coll Radiol) 2024; 36:353-361. [PMID: 38575432 DOI: 10.1016/j.clon.2024.03.015] [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: 12/16/2023] [Revised: 02/14/2024] [Accepted: 03/13/2024] [Indexed: 04/06/2024]
Abstract
BACKGROUND The utility of Adaptive Radiotherapy (ART) in Head and Neck Squamous Cell Carcinoma (HNSCC) remains to be ascertained. While multiple retrospective and single-arm prospective studies have demonstrated its efficacy in decreasing parotid doses and reducing xerostomia, adequate randomized evidence is lacking. METHODS AND ANALYSIS ReSTART (Reducing Salivary Toxicity with Adaptive Radiotherapy) is an ongoing phase III randomized trial of patients with previously untreated, locally advanced HNSCC of the oropharynx, larynx, and hypopharynx. Patients are randomized in a 1:1 ratio to the standard Intensity Modulated Radiotherapy (IMRT) arm {Planning Target Volume (PTV) margin 5 mm} vs. Adaptive Radiotherapy arm (standard IMRT with a PTV margin 3 mm, two planned adaptive planning at 10th and 20th fractions). The stratification factors include the primary site and nodal stage. The RT dose prescribed is 66Gy in 30 fractions for high-risk PTV and 54Gy in 30 fractions for low-risk PTV over six weeks, along with concurrent chemotherapy. The primary endpoint is to compare salivary toxicity between arms using salivary scintigraphy 12 months' post-radiation. To detect a 25% improvement in the primary endpoint at 12 months in the ART arm with a two-sided 5% alpha value and a power of 80% (and 10% attrition ratio), a sample size of 130 patients is required (65 patients in each arm). The secondary endpoints include acute and late toxicities, locoregional control, disease-free survival, overall survival, quality of life, and xerostomia scores between the two arms. DISCUSSION The ReSTART trial aims to answer an important question in Radiation Therapy for HNSCC, particularly in a resource-limited setting. The uniqueness of this trial, compared to other ongoing randomized trials, includes the PTV margins and the xerostomia assessment by scintigraphy at 12 months as the primary endpoint.
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Affiliation(s)
- S Ghosh Laskar
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India.
| | - S Sinha
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India.
| | - A Kumar
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India.
| | - A Samanta
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India.
| | - S Mohanty
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India.
| | - S Kale
- Department of Medical Physics, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India.
| | - F Khan
- Clinical Research Secretariat (CRS), Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India.
| | - S Lewis Salins
- Department of Radiation Oncology, Kasturba Medical College, Manipal, India.
| | - V Murthy
- Department of Radiation Oncology, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India.
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Youssef S, Tsang E, Samanta A, Kumar V, Gothelf KV. Reversible Protection and Targeted Delivery of DNA Origami with a Disulfide-Containing Cationic Polymer. Small 2024; 20:e2301058. [PMID: 37916910 DOI: 10.1002/smll.202301058] [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] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 10/08/2023] [Indexed: 11/03/2023]
Abstract
DNA nanostructures have considerable biomedical potential as intracellular delivery vehicles as they are highly homogeneous and can be functionalized with high spatial resolution. However, challenges like instability under physiological conditions, limited cellular uptake, and lysosomal degradation limit their use. This paper presents a bio-reducible, cationic polymer poly(cystaminebisacrylamide-1,6-diaminohexane) (PCD) as a reversible DNA origami protector. PCD displays a stronger DNA affinity than other cationic polymers. DNA nanostructures with PCD protection are shielded from low salt conditions and DNase I degradation and show a 40-fold increase in cell-association when linked to targeting antibodies. Confocal microscopy reveals a potential secondary cell uptake mechanism, directly delivering the nanostructures to the cytoplasm. Additionally, PCD can be removed by cleaving its backbone disulfides using the intracellular reductant, glutathione. Finally, the application of these constructs is demonstrated for targeted delivery of a cytotoxic agent to cancer cells, which efficiently decreases their viability. The PCD protective agent that is reported here is a simple and efficient method for the stabilization of DNA origami structures. With the ability to deprotect the DNA nanostructures upon entry of the intracellular space, the possibility for the use of DNA origami in pharmaceutical applications is enhanced.
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Affiliation(s)
- Sarah Youssef
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C, 8000, Denmark
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University, Cairo, 11566, Egypt
| | - Emily Tsang
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C, 8000, Denmark
| | - Anirban Samanta
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C, 8000, Denmark
| | - Vipin Kumar
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C, 8000, Denmark
| | - Kurt V Gothelf
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C, 8000, Denmark
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Ng C, Samanta A, Mandrup OA, Tsang E, Youssef S, Klausen LH, Dong M, Nijenhuis MAD, Gothelf KV. Folding Double-Stranded DNA into Designed Shapes with Triplex-Forming Oligonucleotides. Adv Mater 2023; 35:e2302497. [PMID: 37311656 DOI: 10.1002/adma.202302497] [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] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 06/07/2023] [Indexed: 06/15/2023]
Abstract
The compaction and organization of genomic DNA is a central mechanism in eukaryotic cells, but engineered architectural control over double-stranded DNA (dsDNA) is notably challenging. Here, long dsDNA templates are folded into designed shapes via triplex-mediated self-assembly. Triplex-forming oligonucleotides (TFOs) bind purines in dsDNA via normal or reverse Hoogsteen interactions. In the triplex origami methodology, these non-canonical interactions are programmed to compact dsDNA (linear or plasmid) into well-defined objects, which demonstrate a variety of structural features: hollow and raster-filled, single- and multi-layered, with custom curvatures and geometries, and featuring lattice-free, square-, or honeycomb-pleated internal arrangements. Surprisingly, the length of integrated and free-standing dsDNA loops can be modulated with near-perfect efficiency; from hundreds down to only six bp (2 nm). The inherent rigidity of dsDNA promotes structural robustness and non-periodic structures of almost 25.000 nt are therefore formed with fewer unique starting materials, compared to other DNA-based self-assembly methods. Densely triplexed structures also resist degradation by DNase I. Triplex-mediated dsDNA folding is methodologically straightforward and orthogonal to Watson-Crick-based methods. Moreover, it enables unprecedented spatial control over dsDNA templates.
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Affiliation(s)
- Cindy Ng
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Central Denmark Region, 8000, Denmark
| | - Anirban Samanta
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Central Denmark Region, 8000, Denmark
| | - Ole Aalund Mandrup
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Central Denmark Region, 8000, Denmark
| | - Emily Tsang
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Central Denmark Region, 8000, Denmark
| | - Sarah Youssef
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Central Denmark Region, 8000, Denmark
| | - Lasse Hyldgaard Klausen
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Central Denmark Region, 8000, Denmark
| | - Mingdong Dong
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Central Denmark Region, 8000, Denmark
| | - Minke A D Nijenhuis
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Central Denmark Region, 8000, Denmark
| | - Kurt V Gothelf
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Central Denmark Region, 8000, Denmark
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Mathur D, Samanta A, Ancona MG, Díaz SA, Kim Y, Melinger JS, Goldman ER, Sadowski JP, Ong LL, Yin P, Medintz IL. Understanding Förster Resonance Energy Transfer in the Sheet Regime with DNA Brick-Based Dye Networks. ACS Nano 2021; 15:16452-16468. [PMID: 34609842 PMCID: PMC8823280 DOI: 10.1021/acsnano.1c05871] [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] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Controlling excitonic energy transfer at the molecular level is a key requirement for transitioning nanophotonics research to viable devices with the main inspiration coming from biological light-harvesting antennas that collect and direct light energy with near-unity efficiency using Förster resonance energy transfer (FRET). Among putative FRET processes, point-to-plane FRET between donors and acceptors arrayed in two-dimensional sheets is predicted to be particularly efficient with a theoretical 1/r4 energy transfer distance (r) dependency versus the 1/r6 dependency seen for a single donor-acceptor interaction. However, quantitative validation has been confounded by a lack of robust experimental approaches that can rigidly place dyes in the required nanoscale arrangements. To create such assemblies, we utilize a DNA brick scaffold, referred to as a DNA block, which incorporates up to five two-dimensional planes with each displaying from 1 to 12 copies of five different donor, acceptor, or intermediary relay dyes. Nanostructure characterization along with steady-state and time-resolved spectroscopic data were combined with molecular dynamics modeling and detailed numerical simulations to compare the energy transfer efficiencies observed in the experimental DNA block assemblies to theoretical expectations. Overall, we demonstrate clear signatures of sheet regime FRET, and from this we provide a better understanding of what is needed to realize the benefits of such energy transfer in artificial dye networks along with FRET-based sensing and imaging.
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Affiliation(s)
| | | | | | - Sebastián A. Díaz
- Center for Bio/Molecular Science and Engineering Code 6900, U.S. Naval Research Laboratory, Washington, D.C. 20375, United States
| | - Youngchan Kim
- Center for Materials Physics and Technology Code 6390, U.S. Naval Research Laboratory, Washington, D.C. 20375, United States
| | - Joseph S. Melinger
- Electronic Science and Technology Division Code 6800, U.S. Naval Research Laboratory, Washington, D.C. 20375, United States
| | - Ellen R. Goldman
- Center for Bio/Molecular Science and Engineering Code 6900, U.S. Naval Research Laboratory, Washington, D.C. 20375, United States
| | - John Paul Sadowski
- Center for Bio/Molecular Science and Engineering Code 6900, U.S. Naval Research Laboratory, Washington, D.C. 20375, United States; American Society for Engineering Education, Washington, D.C. 20001, United States
| | - Luvena L. Ong
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Department of Systems Biology, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Peng Yin
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Department of Systems Biology, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Igor L. Medintz
- Center for Bio/Molecular Science and Engineering Code 6900, U.S. Naval Research Laboratory, Washington, D.C. 20375, United States
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Sarkar B, Shahid T, Indira G, Biswal S, Sengupta S, Biswas L, Goswami S, Pusarla C, de A, Ghosh T, Mukherjee M, Samanta A, Raj R, Bhattacharya J. PO-1123 Post mastectomy RT planning on institutional, RTOG & ESTRO contouring guidelines comparison. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)07574-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Friedrich S, Kim GB, Bray C, Cantor R, Dilling J, Fretwell S, Hall JA, Lennarz A, Lordi V, Machule P, McKeen D, Mougeot X, Ponce F, Ruiz C, Samanta A, Warburton WK, Leach KG. Limits on the Existence of sub-MeV Sterile Neutrinos from the Decay of ^{7}Be in Superconducting Quantum Sensors. Phys Rev Lett 2021; 126:021803. [PMID: 33512206 DOI: 10.1103/physrevlett.126.021803] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 12/15/2020] [Indexed: 06/12/2023]
Abstract
Sterile neutrinos are natural extensions to the standard model of particle physics and provide a possible portal to the dark sector. We report a new search for the existence of sub-MeV sterile neutrinos using the decay-momentum reconstruction technique in the decay of ^{7}Be. The experiment measures the total energy of the ^{7}Li daughter atom from the electron capture decay of ^{7}Be implanted into sensitive superconducting tunnel junction (STJ) quantum sensors. This first experiment presents data from a single STJ operated at a low count rate for a net total of 28 days, and provides exclusion limits on sterile neutrinos in the mass range from 100 to 850 keV that improve upon previous work by up to an order of magnitude.
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Affiliation(s)
- S Friedrich
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G B Kim
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C Bray
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
| | - R Cantor
- STAR Cryoelectronics LLC, Santa Fe, New Mexico 87508, USA
| | - J Dilling
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - S Fretwell
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
| | - J A Hall
- STAR Cryoelectronics LLC, Santa Fe, New Mexico 87508, USA
| | - A Lennarz
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - V Lordi
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P Machule
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - D McKeen
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - X Mougeot
- Université Paris-Saclay, CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91120 Palaiseau, France
| | - F Ponce
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
- Department of Physics, Stanford University, Stanford, California 94305, USA
| | - C Ruiz
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - A Samanta
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | | | - K G Leach
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
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Shahid T, Kalyani N, Modak Das S, Mukherjee M, Bhattacharya J, De A, Talukdar R, Samanta A, Ghosh T, Barman D, Sadhukhan S, Vijayaraghavan P, Rajan R. EP-1159 To compare outcome of Intensive nutritional support with standard practise in head ands neck cancer. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)31579-8] [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: 11/25/2022]
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8
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Samanta A, Afzal MR, Derbas L, Taduru SS, Roy SD, Jeevanantham V, Dawn B. P4646Bone marrow cell therapy in patients with acute myocardial infarction: a meta-analysis of randomized controlled trials. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.p4646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- A Samanta
- University of Missouri - Kansas City, Internal Medicine, Kansas City, United States of America
| | - M R Afzal
- The Ohio State University, Division of Cardiovascular Medicine, Columbus, United States of America
| | - L Derbas
- University of Missouri - Kansas City, Internal Medicine, Kansas City, United States of America
| | - S S Taduru
- University of Missouri - Kansas City, Internal Medicine, Kansas City, United States of America
| | - S D Roy
- University of Missouri - Kansas City, Internal Medicine, Kansas City, United States of America
| | - V Jeevanantham
- St. Anthony Hospital, Ohlahoma City, United States of America
| | - B Dawn
- University of Kansas Medical Center, Division of Cardiovascular Diseases, Kansas City, United States of America
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Wang L, Beier UH, Akimova T, Dahiya S, Han R, Samanta A, Levine MH, Hancock WW. Histone/protein deacetylase inhibitor therapy for enhancement of Foxp3+ T-regulatory cell function posttransplantation. Am J Transplant 2018; 18:1596-1603. [PMID: 29603600 PMCID: PMC6035084 DOI: 10.1111/ajt.14749] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [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: 01/30/2018] [Revised: 03/20/2018] [Accepted: 03/22/2018] [Indexed: 01/25/2023]
Abstract
T-regulatory (Treg) cells are like other cells present throughout the body in being subject to biochemical modifications in response to extracellular signals. An important component of these responses involves changes in posttranslational modifications (PTMs) of histones and many nonhistone proteins, including phosphorylation/dephosphorylation, ubiquitination/deubiquitination, and acetylation/deacetylation. Foxp3, the key transcription factor of Tregs, is constantly being rapidly turned over, and a number of these PTMs determine its level of expression and activity. Of interest in the transplant setting, modulation of the acetylation or deacetylation of key lysine residues in Foxp3 can promote the stability and function, leading to increased Treg production and increased Treg suppressive activity. This mini-review focuses on recent data concerning the roles that histone/protein deacetylases (HDACs) play in control of Treg function, and how small molecule HDAC inhibitors can be used to promote Treg-dependent allograft survival in experimental models. These data are discussed in the light of increasing interest in the identification and clinical evaluation of isoform-selective HDAC inhibitors, and their potential application as tools to modulate Foxp3+ Treg cell numbers and function in transplant recipients.
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Affiliation(s)
- L. Wang
- Division of Transplant Immunology, Pathology and Laboratory Medicine, The Children’s Hospital of Philadelphia, Philadelphia, PA, USA
| | - U. H. Beier
- Division of Nephrology, Department of Pediatrics, Children's Hospital of Philadelphia and University of Pennsylvania, Philadelphia, PA 19104, USA
| | - T. Akimova
- Division of Transplant Immunology, Pathology and Laboratory Medicine, The Children’s Hospital of Philadelphia, Philadelphia, PA, USA,Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - S. Dahiya
- Division of Transplant Immunology, Pathology and Laboratory Medicine, The Children’s Hospital of Philadelphia, Philadelphia, PA, USA
| | - R. Han
- Division of Transplant Immunology, Pathology and Laboratory Medicine, The Children’s Hospital of Philadelphia, Philadelphia, PA, USA
| | - A. Samanta
- Division of Transplant Immunology, Pathology and Laboratory Medicine, The Children’s Hospital of Philadelphia, Philadelphia, PA, USA
| | - M. H. Levine
- Division of Transplant Surgery, Department of Surgery, University of Pennsylvania, and Department of Surgery, Children’s Hospital of Philadelphia, Philadelphia, PA, USA
| | - W. W. Hancock
- Division of Transplant Immunology, Pathology and Laboratory Medicine, The Children’s Hospital of Philadelphia, Philadelphia, PA, USA,Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA, USA
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Zepeda-Ruiz LA, Sadigh B, Chernov AA, Haxhimali T, Samanta A, Oppelstrup T, Hamel S, Benedict LX, Belof JL. Extraction of effective solid-liquid interfacial free energies for full 3D solid crystallites from equilibrium MD simulations. J Chem Phys 2018; 147:194704. [PMID: 29166088 DOI: 10.1063/1.4997595] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Molecular dynamics simulations of an embedded atom copper system in the isobaric-isenthalpic ensemble are used to study the effective solid-liquid interfacial free energy of quasi-spherical solid crystals within a liquid. This is within the larger context of molecular dynamics simulations of this system undergoing solidification, where single individually prepared crystallites of different sizes grow until they reach a thermodynamically stable final state. The resulting equilibrium shapes possess the full structural details expected for solids with weakly anisotropic surface free energies (in these cases, ∼5% radial flattening and rounded [111] octahedral faces). The simplifying assumption of sphericity and perfect isotropy leads to an effective interfacial free energy as appearing in the Gibbs-Thomson equation, which we determine to be ∼177 erg/cm2, roughly independent of crystal size for radii in the 50-250 Å range. This quantity may be used in atomistically informed models of solidification kinetics for this system.
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Affiliation(s)
- L A Zepeda-Ruiz
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - B Sadigh
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - A A Chernov
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - T Haxhimali
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - A Samanta
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - T Oppelstrup
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - S Hamel
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - L X Benedict
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - J L Belof
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
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Dubey A, Samanta A, Sarkar P, Karmakar M, Mukherjee A, Loha C, Kumar M, Sahu S, Saxena V, Chatterjee P. Hydrodynamic characteristics in a pilot-scale cold flow model for chemical looping combustion. ADV POWDER TECHNOL 2018. [DOI: 10.1016/j.apt.2018.03.017] [Citation(s) in RCA: 6] [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: 10/17/2022]
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Bhattacharya J, Mukherjee M, Shahid T, Rajan R, Talukdar R, S J, Samanta A, Vijayaraghavan P. EP-1318: Hypofractionationated RT in Breast Cancer: Early Experience from a tertiary care centre in India. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)31628-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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13
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Ravichandran R, Islam MM, Alarcon EI, Samanta A, Wang S, Lundström P, Hilborn J, Griffith M, Phopase J. Correction: Functionalised type-I collagen as a hydrogel building block for bio-orthogonal tissue engineering applications. J Mater Chem B 2017; 5:5284. [PMID: 32264115 DOI: 10.1039/c7tb90075a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Correction for 'Functionalised type-I collagen as a hydrogel building block for bio-orthogonal tissue engineering applications' by R. Ravichandran et al., J. Mater. Chem. B, 2016, 4, 318-326.
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Affiliation(s)
- R Ravichandran
- Integrative Regenerative Medicine Centre (IGEN) and Division of Molecular Physics, Department of Physics, Chemistry and Biology (IFM), Linköping University, S-58183, Linköping, Sweden.
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Samanta A, Chandra J, Kaur R, Anand R, Shukla S, Mandal P. “Clinical profile and microbiological spectrum of Febrile neutropenic episodes in children with severe aplastic anemia: A single cente prospective study”. Pediatric Hematology Oncology Journal 2017. [DOI: 10.1016/j.phoj.2017.11.094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Chanda S, Samanta A, Paul B, Ghosh K, Giri S. Effect of Dietary Iron Level on Growth Performance and Enzyme Activity in Rohu (Labeo rohita Hamilton) Fingerlings. ACTA ACUST UNITED AC 2017. [DOI: 10.5958/2231-6744.2017.00038.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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16
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Samanta A, Landau MV, Vidruk-Nehemya R, Herskowitz M. CO2 hydrogenation to higher hydrocarbons on K/Fe–Al–O spinel catalysts promoted with Si, Ti, Zr, Hf, Mn and Ce. Catal Sci Technol 2017. [DOI: 10.1039/c7cy01118k] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Si and Zr species grafted on Fe–Al–O catalysts act as an inhibitor and promoter, respectively, in CO2 hydrogenation.
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Affiliation(s)
- A. Samanta
- Chemical Engineering Department
- Blechner Center for Industrial Catalysis and Process Development
- Ben-Gurion University of the Negev
- Beer-Sheva
- Israel
| | - M. V. Landau
- Chemical Engineering Department
- Blechner Center for Industrial Catalysis and Process Development
- Ben-Gurion University of the Negev
- Beer-Sheva
- Israel
| | - R. Vidruk-Nehemya
- Chemical Engineering Department
- Blechner Center for Industrial Catalysis and Process Development
- Ben-Gurion University of the Negev
- Beer-Sheva
- Israel
| | - M. Herskowitz
- Chemical Engineering Department
- Blechner Center for Industrial Catalysis and Process Development
- Ben-Gurion University of the Negev
- Beer-Sheva
- Israel
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Choudhary RK, Mishra P, Samanta A, Haider J, Mallik GK, Singh K, Kain V. Electrochemical deposition of uranium dioxide coatings on alloy 600: effect of annealing on Ni and Cu interlayer mixing. J Radioanal Nucl Chem 2016. [DOI: 10.1007/s10967-016-5084-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Waxman R, Adebajo A, Robinson S, Walker D, Johnson M, Rahman A, Samanta A, Kumar K, Raza K, Helliwell P. A feasibility study of educational tools for osteomalacia. Clin Rheumatol 2016; 36:635-640. [PMID: 27785646 PMCID: PMC5323499 DOI: 10.1007/s10067-016-3451-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Accepted: 10/09/2016] [Indexed: 11/25/2022]
Abstract
Many people in the UK, particularly people of South Asian origin, are advised to supplement their vitamin D intake, yet most do not. This suggests an unmet educational need. The osteomalacia mind map was developed to meet this need. The mind map contains culturally sensitive images, translated into Urdu and made interactive on a DVD. This study explores the feasibility of a randomised controlled study to measure the effect of education on improving vitamin D knowledge and adherence. This was a pilot and feasibility study. Cluster randomisation was used to avoid inter person contamination. Two South Asian women's groups were recruited to receive information about osteomalacia either by interactive DVD or an Arthritis Research UK leaflet. Knowledge and compliance were tested before and after the educational interventions via a knowledge questionnaire and the measurement of vitamin D and parathormone levels. The groups were found to be mismatched for knowledge, educational attainment and language at baseline. There were also organisational difficulties and possible confounding due to different tutors and translators. The DVD group had high knowledge at baseline which did not improve. The leaflet group had low knowledge at baseline that did improve. The DVD group had lower parathormone which did not change. The leaflet group had an increase in vitamin D but parathormone remained high. Performing a randomised study with this population utilising an educational intervention was difficult to execute. If cluster randomisation is used, extreme care must be taken to match the groups at baseline.
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Affiliation(s)
- R Waxman
- Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, 2nd Floor, Chapel Allerton Hospital, Harehills Lane, Leeds, LS7 4SA, UK
| | - A Adebajo
- Faculty of Medicine, Dentistry and Health, University of Sheffield, Beech Hill Road, Sheffield, S10 2RX, UK
| | - S Robinson
- Northumbria NHS Trust, North Tynside General Hospital, Rake Lane, North Sheilds, NE29 8NH, UK
| | - D Walker
- Northumbria NHS Trust, North Tynside General Hospital, Rake Lane, North Sheilds, NE29 8NH, UK
| | - M Johnson
- Mary Seacole Research Centre, De Monfort University, The Gateway, Leicester, LE1 9BH, UK
| | - A Rahman
- Department of Rheumatology, University College London, Rayne Institute, 5 University Street, London, WC1E 6JF, UK
| | - A Samanta
- University Hospitals of Leicester NHS Trust, Leicester, LE1 5 WW, UK
| | - K Kumar
- Faculty of Biology, Medicine and Health, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - K Raza
- Institute of Inflammation and Ageing, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
- Department of Rheumatology, Sandwell and West Birmingham Hospitals NHS Trust, Birmingham, B18 7QH, UK
| | - P Helliwell
- Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, 2nd Floor, Chapel Allerton Hospital, Harehills Lane, Leeds, LS7 4SA, UK.
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Abstract
Functionally integrating DNA and other nucleic acids with nanoparticles in all their different physicochemical forms has produced a rich variety of composite nanomaterials which, in many cases, display unique or augmented properties due to the synergistic activity of both components. These capabilities, in turn, are attracting greater attention from various research communities in search of new nanoscale tools for diverse applications that include (bio)sensing, labeling, targeted imaging, cellular delivery, diagnostics, therapeutics, theranostics, bioelectronics, and biocomputing to name just a few amongst many others. Here, we review this vibrant and growing research area from the perspective of the materials themselves and their unique capabilities. Inorganic nanocrystals such as quantum dots or those made from gold or other (noble) metals along with metal oxides and carbon allotropes are desired as participants in these hybrid materials since they can provide distinctive optical, physical, magnetic, and electrochemical properties. Beyond this, synthetic polymer-based and proteinaceous or viral nanoparticulate materials are also useful in the same role since they can provide a predefined and biocompatible cargo-carrying and targeting capability. The DNA component typically provides sequence-based addressability for probes along with, more recently, unique architectural properties that directly originate from the burgeoning structural DNA field. Additionally, DNA aptamers can also provide specific recognition capabilities against many diverse non-nucleic acid targets across a range of size scales from ions to full protein and cells. In addition to appending DNA to inorganic or polymeric nanoparticles, purely DNA-based nanoparticles have recently surfaced as an excellent assembly platform and have started finding application in areas like sensing, imaging and immunotherapy. We focus on selected and representative nanoparticle-DNA materials and highlight their myriad applications using examples from the literature. Overall, it is clear that this unique functional combination of nanomaterials has far more to offer than what we have seen to date and as new capabilities for each of these materials are developed, so, too, will new applications emerge.
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Affiliation(s)
- Anirban Samanta
- Center for Bio/Molecular Science and Engineering, Code 6900, U.S. Naval Research Laboratory, Washington, DC 20375, USA. and College of Science, George Mason University, Fairfax, Virginia 22030, USA
| | - Igor L Medintz
- Center for Bio/Molecular Science and Engineering, Code 6900, U.S. Naval Research Laboratory, Washington, DC 20375, USA.
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Ravichandran R, Islam MM, Alarcon EI, Samanta A, Wang S, Lundström P, Hilborn J, Griffith M, Phopase J. Functionalised type-I collagen as a hydrogel building block for bio-orthogonal tissue engineering applications. J Mater Chem B 2016; 4:318-326. [DOI: 10.1039/c5tb02035b] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Modulating the hydrogel properties from injectable to implantable scaffolds using the bio-orthogonal thiol-Michael addition click reaction.
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Affiliation(s)
- R. Ravichandran
- Integrative Regenerative Medicine Centre (IGEN) and Division of Molecular Physics
- Department of Physics
- Chemistry and Biology (IFM)
- Linköping University
- Linköping
| | - M. M. Islam
- Integrative Regenerative Medicine Centre (IGEN) and Swedish Medical Nanoscience Center
- Department of Neurosciences
- Karolinska Institutet
- Stockholm
- Sweden
| | - E. I. Alarcon
- Division of Cardiac Surgery Research
- University of Ottawa Heart Institute
- Ottawa
- Canada
- Department of Biochemistry
| | - A. Samanta
- Integrative Regenerative Medicine Centre and Department of Clinical and Experimental Medicine (IKE)
- Linköping University
- Linköping
- Sweden
| | - S. Wang
- Polymer Chemistry Division
- Department of Chemistry
- Ångstrom Laboratory
- Uppsala University
- 75121 Uppsala
| | - P. Lundström
- Division of Chemistry
- Department of Physics
- Chemistry and Biology (IFM)
- Linköping University
- Linköping
| | - J. Hilborn
- Polymer Chemistry Division
- Department of Chemistry
- Ångstrom Laboratory
- Uppsala University
- 75121 Uppsala
| | - M. Griffith
- Integrative Regenerative Medicine Centre and Department of Clinical and Experimental Medicine (IKE)
- Linköping University
- Linköping
- Sweden
| | - J. Phopase
- Integrative Regenerative Medicine Centre (IGEN) and Division of Molecular Physics
- Department of Physics
- Chemistry and Biology (IFM)
- Linköping University
- Linköping
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Das P, Moorthy A, Samanta A. THU0222 Anti TNF Therapy in Ankylosing Spondylitis – an Observational Study Assessing the Impact of Smoking in White British and Indian Population: Table 1. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.6404] [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: 11/04/2022]
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Samanta A, Walper SA, Susumu K, Dwyer CL, Medintz IL. An enzymatically-sensitized sequential and concentric energy transfer relay self-assembled around semiconductor quantum dots. Nanoscale 2015; 7:7603-7614. [PMID: 25804284 DOI: 10.1039/c5nr00828j] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The ability to control light energy within de novo nanoscale structures and devices will greatly benefit their continuing development and ultimate application. Ideally, this control should extend from generating the light itself to its spatial propagation within the device along with providing defined emission wavelength(s), all in a stand-alone modality. Here we design and characterize macromolecular nanoassemblies consisting of semiconductor quantum dots (QDs), several differentially dye-labeled peptides and the enzyme luciferase which cumulatively demonstrate many of these capabilities by engaging in multiple-sequential energy transfer steps. To create these structures, recombinantly-expressed luciferase and the dye-labeled peptides were appended with a terminal polyhistidine sequence allowing for controlled ratiometric self-assembly around the QDs via metal-affinity coordination. The QDs serve to provide multiple roles in these structures including as central assembly platforms or nanoscaffolds along with acting as a potent energy harvesting and transfer relay. The devices are activated by addition of coelenterazine H substrate which is oxidized by luciferase producing light energy which sensitizes the central 625 nm emitting QD acceptor by bioluminescence resonance energy transfer (BRET). The sensitized QD, in turn, acts as a relay and transfers the energy to a first peptide-labeled Alexa Fluor 647 acceptor dye displayed on its surface. This dye then transfers energy to a second red-shifted peptide-labeled dye acceptor on the QD surface through a second concentric Förster resonance energy transfer (FRET) process. Alexa Fluor 700 and Cy5.5 are both tested in the role of this terminal FRET acceptor. Photophysical analysis of spectral profiles from the resulting sequential BRET-FRET-FRET processes allow us to estimate the efficiency of each of the transfer steps. Importantly, the efficiency of each step within this energy transfer cascade can be controlled to some extent by the number of enzymes/peptides displayed on the QD. Further optimization of the energy transfer process(es) along with potential applications of such devices are finally discussed.
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Affiliation(s)
- Anirban Samanta
- Center for Bio/Molecular Science and Engineering, Code 6900, U. S. Naval Research Laboratory, Washington, DC 20375 USA.
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Abstract
DNA nanotechnology has touched the epitome of miniaturization by integrating various nanometer size particles with nanometer precision. This enticing bottom-up approach has employed small DNA tiles, large multi-dimensional polymeric structures or more recently DNA origami to organize nanoparticles of different inorganic materials, small organic molecules or macro-biomolecules like proteins, and RNAs into fascinating patterns that are difficult to achieve by other conventional methods. Here, we are especially interested in the self-assembly of nanomaterials that are potentially attractive elements in the burgeoning field of nanophotonics. These materials include plasmonic nanoparticles, quantum dots, fluorescent organic dyes, etc. DNA based self-assembly allows excellent control over distance, orientation and stoichiometry of these nano-elements that helps to engineer intelligent systems that can potentially pave the path for future technology. Many outstanding structures have been fabricated that are capable of fine tuning optical properties, such as fluorescence intensity and lifetime modulation, enhancement of Raman scattering and emergence of circular dichroism responses. Within the limited scope of this review we have tried to give a glimpse of the development of this still nascent but highly promising field to its current status as well as the existing challenges before us.
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Affiliation(s)
- Anirban Samanta
- Department of Chemistry and Biochemistry & Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA.
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Das P, Samanta A, Moorthy A. Anti TNF therapy in Ankylosing spondylitis-Is there any influence of ethnicity and smoking in treatment outcome? Indian Journal of Rheumatology 2014. [DOI: 10.1016/j.injr.2014.10.134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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25
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Samanta A, Zhou Y, Zou S, Yan H, Liu Y. Fluorescence quenching of quantum dots by gold nanoparticles: a potential long range spectroscopic ruler. Nano Lett 2014; 14:5052-7. [PMID: 25084363 DOI: 10.1021/nl501709s] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
The dependence of quantum dot (QD) fluorescence emission on the proximity of 30 nm gold nanoparticles (AuNPs) was studied with controlled interparticle distances ranging from 15 to 70 nm. This was achieved by coassembling DNA-conjugated QDs and AuNPs in a 1:1 ratio at precise positions on a triangular-shaped DNA origami platform. A profound, long-range quenching of the photoluminescence intensity of the QDs was observed. A combination of static and time-resolved fluorescence measurements suggests that the quenching is due to an increase in the nonradiative decay rate of QD emission. Unlike FRET, the energy transfer is inversely proportional to the 2.7th power of the distance between nanoparticles with half quenching at ∼28 nm. This long-range quenching phenomena may be useful for developing extended spectroscopic rulers in the future.
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Affiliation(s)
- Anirban Samanta
- Department of Chemistry and Biochemistry, and Center for Molecular Design and Biomimicry, Biodesign Institute at Arizona State University , 1001 South McAllister Avenue, Tempe, Arizona 85287-5601, United States
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26
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Robinson S, Adebajo A, Heliwell P, Rahman A, Raza K, Samanta A, Johnson M, Bishop P, Kumar K, Walker D. THU0572-HPR Osteomalacia: Developing an Interactive Education Tool for South Asian Populations. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.4424] [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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27
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Abstract
QDs that emit in the infrared (IR) range are of special interest at the moment because of their potential as tissue imaging reagents. Due to autofluorescence from tissues, QDs that emit in the visible range fail to produce good signal to noise ratios. Here we report the production of Cd(x)Pb(1-x)Te tertiary-alloyed QDs that emit in the 1100-1300 nm wavelength range, capped with the hydrophilic ligands mercaptopropionic acid (MPA) or glutathione (GSH), together with DNA, as specific surface tags. We observed an interesting dependence of the QD emission peaks on the species of capping ligand used. ICP-MS analysis confirmed that changing the identity of the surface ligand in the reaction mixture shifted the elemental composition of the particles and resulted in different Cd/Pb ratios. Further, DNA directed assembly of the particles onto DNA nanostructures ensures that the particle remains stable in high salt conditions, which is crucial to biological applications.
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Affiliation(s)
- Anirban Samanta
- Department of Chemistry and Biochemistry, Center for Single Molecule Biophysics, Biodesign Institute at Arizona State University, 1001 South McAllister Avenue, Tempe, Arizona 85287-5601, USA.
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Datta D, Samanta A, Dasgupta S, Pathak T. Synthesis of 5′-carboxymethylsulfonyl-5′-deoxyribonucleosides under mild hydrolytic conditions: a new class of acidic nucleosides as inhibitors of ribonuclease A. RSC Adv 2014. [DOI: 10.1039/c3ra45084h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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29
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Ojha D, Mukherjee H, Ghosh S, Bag P, Mondal S, Chandra N, Mondal K, Samanta A, Chakrabarti S, Chattopadhyay D. Evaluation of anti-infective potential of a tribal folklore Odina wodier
Roxb against some selected microbes and herpes simplex virus associated with skin infection. J Appl Microbiol 2013; 115:1317-28. [DOI: 10.1111/jam.12330] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Revised: 07/26/2013] [Accepted: 08/12/2013] [Indexed: 11/26/2022]
Affiliation(s)
- D. Ojha
- CMR Virus Unit; I.D. & B.G. Hospital; Beliaghata Kolkata India
| | - H. Mukherjee
- CMR Virus Unit; I.D. & B.G. Hospital; Beliaghata Kolkata India
| | - S. Ghosh
- Division of Microbiology; Department of Pharmaceutical Technology; Jadavpur University; Kolkata India
| | - P. Bag
- CMR Virus Unit; I.D. & B.G. Hospital; Beliaghata Kolkata India
| | - S. Mondal
- CMR Virus Unit; I.D. & B.G. Hospital; Beliaghata Kolkata India
| | - N.S. Chandra
- CMR Virus Unit; I.D. & B.G. Hospital; Beliaghata Kolkata India
| | - K.C. Mondal
- Department of Microbiology; Vidyasagar University; Medinipur India
| | - A. Samanta
- Division of Microbiology; Department of Pharmaceutical Technology; Jadavpur University; Kolkata India
| | - S. Chakrabarti
- CMR Virus Unit; I.D. & B.G. Hospital; Beliaghata Kolkata India
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Datta D, Samanta A, Dasgupta S, Pathak T. 3′-Oxo-, amino-, thio- and sulfone-acetic acid modified thymidines: Effect of increased acidity on ribonuclease A inhibition. Bioorg Med Chem 2013; 21:4634-45. [DOI: 10.1016/j.bmc.2013.05.047] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 05/13/2013] [Accepted: 05/14/2013] [Indexed: 01/13/2023]
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Han D, Jiang S, Samanta A, Liu Y, Yan H. Unidirectional scaffold-strand arrangement in DNA origami. Angew Chem Int Ed Engl 2013; 52:9031-4. [PMID: 23852715 DOI: 10.1002/anie.201302177] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Revised: 06/16/2013] [Indexed: 11/09/2022]
Affiliation(s)
- Dongran Han
- The Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
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Panchal S, Moorthy A, Hayat S, Pande I, Adebajo A, Chakravarty K, Samanta A. FRI0446 A national audit of patients with rheumatoid arthritis of black and minority ethnic origin. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.2903] [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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34
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Deng Z, Pal S, Samanta A, Yan H, Liu Y. DNA functionalization of colloidal II–VI semiconductor nanowires for multiplex nanoheterostructures. Chem Sci 2013. [DOI: 10.1039/c3sc00065f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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35
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Deng Z, Samanta A, Nangreave J, Yan H, Liu Y. Robust DNA-functionalized core/shell quantum dots with fluorescent emission spanning from UV-vis to near-IR and compatible with DNA-directed self-assembly. J Am Chem Soc 2012; 134:17424-7. [PMID: 23036133 DOI: 10.1021/ja3081023] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The assembly and isolation of DNA oligonucleotide-functionalized gold nanoparticles (AuNPs) has become a well-developed technology that is based on the strong bonding interactions between gold and thiolated DNA. However, achieving DNA-functionalized semiconductor quantum dots (QDs) that are robust enough to withstand precipitation at high temperature and ionic strength through simple attachment of modified DNA to the QD surface remains a challenge. We report the synthesis of stable core/shell (1-20 monolayers) QD-DNA conjugates in which the end of the phosphorothiolated oligonucleotide (5-10 nucleotides) is "embedded" within the shell of the QD. These reliable QD-DNA conjugates exhibit excellent chemical and photonic stability, colloidal stability over a wide pH range (4-12) and at high salt concentrations (>100 mM Na(+) or Mg(2+)), bright fluorescence emission with quantum yields of up to 70%, and broad spectral tunability with emission ranging from the UV to the NIR (360-800 nm).
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Affiliation(s)
- Zhengtao Deng
- The Biodesign Institute and Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, USA
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36
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Samanta A, Deng Z, Liu Y. Aqueous synthesis of glutathione-capped CdTe/CdS/ZnS and CdTe/CdSe/ZnS core/shell/shell nanocrystal heterostructures. Langmuir 2012; 28:8205-8215. [PMID: 22551311 DOI: 10.1021/la300515a] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Here we demonstrate the aqueous synthesis of colloidal nanocrystal heterostructures consisting of the CdTe core encapsulated by CdS/ZnS or CdSe/ZnS shells using glutathione (GSH), a tripeptide, as the capping ligand. The inner CdTe/CdS and CdTe/CdSe heterostructures have type-I, quasi-type-II, or type-II band offsets depending on the core size and shell thickness, and the outer CdS/ZnS and CdSe/ZnS structures have type-I band offsets. The emission maxima of the assembled heterostructures were found to be dependent on the CdTe core size, with a wider range of spectral tunability observed for the smaller cores. Because of encapsulation effects, the formation of successive shells resulted in a considerable increase in the photoluminescence quantum yield; however, identifying optimal shell thicknesses was required to achieve the maximum quantum yield. Photoluminescence lifetime measurements revealed that the decrease in the quantum yield of thick-shell nanocrystals was caused by a substantial decrease in the radiative rate constant. By tuning the diameter of the core and the thickness of each shell, a broad range of high quantum yield (up to 45%) nanocrystal heterostructures with emission ranging from visible to NIR wavelengths (500-730 nm) were obtained. This versatile route to engineering the optical properties of nanocrystal heterostructures will provide new opportunities for applications in bioimaging and biolabeling.
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Affiliation(s)
- Anirban Samanta
- The Biodesign Institute and Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
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Mandal B, Pattanayak PSD, Samanta A, Chatterjee AK. Effect of potassium application on the transformation of zinc fractions in soil and on the zinc nutrition of wetland rice. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/jpln.1996.3581590502] [Citation(s) in RCA: 3] [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: 11/08/2022]
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Samanta A, Dasgupta S, Pathak T. 5′-Modified pyrimidine nucleosides as inhibitors of ribonuclease A. Bioorg Med Chem 2011; 19:2478-84. [DOI: 10.1016/j.bmc.2010.08.059] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2010] [Revised: 08/27/2010] [Accepted: 08/28/2010] [Indexed: 10/19/2022]
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Paul A, John H, Oakley L, Deeley D, Samaranayaka M, Klocke R, Murley A, Webb E, Al-Allaf A, Panchal S, Moorthy A, Samanta A, Rajak R, Zaman M, Camilleri J, Nash J, Negi A, Jones S, Hull DN, Smith AS, Taylor PC, Hughes L, Done J, Young A, Colijn E, Franssen M, Rabsztyn PRI, van den Ende CHM, Williams A, Graham A, Davies S, Longrigg K, Dagg A, Lyons C, Bowen C, Wright S, Cornell P, Richards S. BHPR - audit/service delivery: 93. Taking Care of the Foot Health of Rheumatology Patients: Where Do We Stand Now? Rheumatology (Oxford) 2011. [DOI: 10.1093/rheumatology/ker044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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40
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Ray A, Santhosh K, Chattopadhyay S, Samanta A, Bhattacharya S. Spectroscopic and Theoretical Investigations on Effective and Selective Interaction of Fullerenes C60 and C70 with a Derivatized Zn−phthalocyanine: Stabilization of Charge-Recombined State by Side-On Approach of C70. J Phys Chem A 2010; 114:5544-50. [DOI: 10.1021/jp1012818] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A. Ray
- Department of Chemistry, The University of Burdwan, Golapbag, Burdwan, 713 104, India, School of Chemistry, University of Hyderabad, Hyderabad, 500 046, AP, India, and Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India
| | - K. Santhosh
- Department of Chemistry, The University of Burdwan, Golapbag, Burdwan, 713 104, India, School of Chemistry, University of Hyderabad, Hyderabad, 500 046, AP, India, and Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India
| | - S. Chattopadhyay
- Department of Chemistry, The University of Burdwan, Golapbag, Burdwan, 713 104, India, School of Chemistry, University of Hyderabad, Hyderabad, 500 046, AP, India, and Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India
| | - A. Samanta
- Department of Chemistry, The University of Burdwan, Golapbag, Burdwan, 713 104, India, School of Chemistry, University of Hyderabad, Hyderabad, 500 046, AP, India, and Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India
| | - S. Bhattacharya
- Department of Chemistry, The University of Burdwan, Golapbag, Burdwan, 713 104, India, School of Chemistry, University of Hyderabad, Hyderabad, 500 046, AP, India, and Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India
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Goh L, Samanta A. A systematic MEDLINE analysis of therapeutic approaches in ankylosing spondylitis. Rheumatol Int 2009; 29:1123-35. [PMID: 19562344 DOI: 10.1007/s00296-009-0973-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2008] [Accepted: 05/20/2009] [Indexed: 12/17/2022]
Abstract
Ankylosing spondylitis (AS) is a chronic inflammatory disorder involving the sacroiliac joints (SIJs), spine and less frequently the peripheral joints. Traditionally, it is well recognised that AS is a challenging disease to manage due to the lack of effective therapeutic options. Current evidence would suggest this has changed and there are now a number of therapies available that provide persistent control of inflammatory symptoms with improvement in daily function. NSAIDs remain the first step in patient treatment. Sulphasalazine may be effective in peripheral arthritis and there are emerging data to support its use in early inflammatory back pain. Studies have shown that pamidronate and steroid injection into SIJ have a symptom-modifying effect in AS. Current data suggest that anti-TNF treatment promises early benefit which is likely to continue in the longer term. Treatment with biologics should be considered sooner rather than later in the management of AS.
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Affiliation(s)
- L Goh
- Department of Rheumatology, Musgrove Park Hospital, Taunton and Somerset NHS Trust, Taunton, TA1 5DA, UK.
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Maiti TK, Ghosh KS, Samanta A, Dasgupta S. Erratum to “The interaction of silibinin with human serum albumin: A spectroscopic investigation” [J. Photochem. Photobiol. A: Chem. 194 (2008) 297–307]. J Photochem Photobiol A Chem 2009. [DOI: 10.1016/j.jphotochem.2009.02.013] [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: 12/01/2022]
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Samanta A, Leonidas DD, Dasgupta S, Pathak T, Zographos SE, Oikonomakos NG. Morpholino, Piperidino, and Pyrrolidino Derivatives of Pyrimidine Nucleosides as Inhibitors of Ribonuclease A: Synthesis, Biochemical, and Crystallographic Evaluation,. J Med Chem 2009; 52:932-42. [DOI: 10.1021/jm800724t] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anirban Samanta
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India, and Institute of Organic and Pharmaceutical Chemistry, National Hellenic Research Foundation, 48 Vas. Constantinou Avenue, 11635 Athens, Greece
| | - Demetres D. Leonidas
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India, and Institute of Organic and Pharmaceutical Chemistry, National Hellenic Research Foundation, 48 Vas. Constantinou Avenue, 11635 Athens, Greece
| | - Swagata Dasgupta
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India, and Institute of Organic and Pharmaceutical Chemistry, National Hellenic Research Foundation, 48 Vas. Constantinou Avenue, 11635 Athens, Greece
| | - Tanmaya Pathak
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India, and Institute of Organic and Pharmaceutical Chemistry, National Hellenic Research Foundation, 48 Vas. Constantinou Avenue, 11635 Athens, Greece
| | - Spyros E. Zographos
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India, and Institute of Organic and Pharmaceutical Chemistry, National Hellenic Research Foundation, 48 Vas. Constantinou Avenue, 11635 Athens, Greece
| | - Nikos G. Oikonomakos
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India, and Institute of Organic and Pharmaceutical Chemistry, National Hellenic Research Foundation, 48 Vas. Constantinou Avenue, 11635 Athens, Greece
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Samanta A, Johnson MRD, Guo F, Adebajo A. Snails in bottles and language cuckoos: an evaluation of patient information resources for South Asians with osteomalacia. Rheumatology (Oxford) 2008; 48:299-303. [DOI: 10.1093/rheumatology/ken464] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Maiti TK, Ghosh KS, Samanta A, Dasgupta S. The interaction of silibinin with human serum albumin: A spectroscopic investigation. J Photochem Photobiol A Chem 2008. [DOI: 10.1016/j.jphotochem.2007.08.028] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Morrow M, Samanta A, Kioussis D, Brady HJM, Williams O. TEL-AML1 preleukemic activity requires the DNA binding domain of AML1 and the dimerization and corepressor binding domains of TEL. Oncogene 2007; 26:4404-14. [PMID: 17237815 DOI: 10.1038/sj.onc.1210227] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [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: 05/08/2006] [Revised: 11/01/2006] [Accepted: 11/22/2006] [Indexed: 12/30/2022]
Abstract
The t(12;21)(p13;q22) translocation generates the TEL-AML1 (TEL, translocation-Ets-leukemia; AML1, acute myeloid leukemia-1) (ETV6-RUNX1) fusion product and is the most common chromosomal abnormality in pediatric leukemia. Our previous studies using a murine fetal liver transplantation model demonstrated that TEL-AML1 promotes the self-renewal of B-cell precursors in vitro and enhances the expansion of hematopoietic stem cells (HSCs) in vivo. This is consistent with the hypothesis that TEL-AML1 induces expansion of a preleukemic clone. Several studies have described domains within TEL-AML1 involved in the transcriptional regulation of specific target genes. However, it is unclear which of these domains is important for the activity of TEL-AML1 in preleukemic hematopoiesis. In order to examine this, we have generated a panel of deletion mutants and expressed them in HSCs. These experiments demonstrate that TEL-AML1 requires multiple domains from both TEL and AML1 to alter hematopoiesis. Furthermore, mutation of a single amino-acid residue within the runt homology domain of AML1, required for DNA binding, was sufficient to abrogate TEL-AML1 activity. These data suggest that TEL-AML1 acts as an aberrant transcription factor to perturb multiple pathways during hematopoiesis.
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Affiliation(s)
- M Morrow
- Molecular Haematology and Cancer Biology Unit, Institute of Child Health, University College, London, UK
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Leonidas DD, Maiti TK, Samanta A, Dasgupta S, Pathak T, Zographos SE, Oikonomakos NG. The binding of 3′-N-piperidine-4-carboxyl-3′-deoxy-ara-uridine to ribonuclease A in the crystal. Bioorg Med Chem 2006; 14:6055-64. [PMID: 16730994 DOI: 10.1016/j.bmc.2006.05.011] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2006] [Revised: 04/28/2006] [Accepted: 05/03/2006] [Indexed: 10/24/2022]
Abstract
The binding of a moderate inhibitor, 3'-N-piperidine-4-carboxyl-3'-deoxy-ara-uridine, to ribonuclease A has been studied by X-ray crystallography at 1.7A resolution. Two inhibitor molecules are bound in the central RNA binding cavity of RNase A exploiting interactions with residues from peripheral binding sites rather than from the active site of the enzyme. The uracyl moiety of the first inhibitor molecule occupies the purine-preferring site of RNase A, while the rest of the molecule projects to the solvent. The second inhibitor molecule binds with the carboxyl group at the pyrimidine recognition site and the uridine moiety exploits interactions with RNase A residues Lys66, His119 and Asp121. Comparative structural analysis of the 3'-N-piperidine-4-carboxyl-3'-deoxy-ara-uridine complex with other RNase A-ligand complexes provides a structural explanation of its potency. The crystal structure of the RNase A-3'-N-piperidine-4-carboxyl-3'-deoxy-ara-uridine complex provides evidence of a novel ligand-binding pattern in RNase A for 3'-N-aminonucleosides that was not anticipated by modelling studies, while it also suggests ways to improve the efficiency and selectivity of such compounds to develop pharmaceuticals against pathologies associated with RNase A homologues.
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Affiliation(s)
- Demetres D Leonidas
- Institute of Organic and Pharmaceutical Chemistry, The National Hellenic Research Foundation, 48 Vas. Constantinou Avenue, 11635 Athens, Greece.
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Samanta A. Medical experts, the law and professional regulation. J R Soc Med 2006. [DOI: 10.1258/jrsm.99.5.217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Patra A, Hebalkar N, Sreedhar B, Sarkar M, Samanta A, Radhakrishnan TP. Tuning the size and optical properties in molecular nano/microcrystals: manifestation of hierarchical interactions. Small 2006; 2:650-9. [PMID: 17193103 DOI: 10.1002/smll.200500385] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Intermolecular interactions, such as hydrogen bonding, dipolar and van der Waals, occurring in molecular crystals cover a range of magnitudes. As the crystal evolves from a relatively softer state in the nanoscopic size regime to a harder one in the microcrystalline and bulk solid state, the impact of the hierarchy of intermolecular interactions can be expected to emerge in a progressive fashion. The strongest interactions alone would be manifested at small sizes; as the crystal grows, the effect of the weaker ones will be added on, with the bulk crystals exhibiting the cumulative impact of the different interactions. We demonstrate this phenomenon through investigations of the solution, colloid, and solid state of a novel zwitterionic molecule based on the diaminodicyanoquinodimethane framework. A reprecipitation-digestion protocol is developed for the fabrication of nano/microcrystals of varying sizes. Microscopic and spectroscopic characterizations reveal tuning of the size and optical properties of this material. The optical absorption of the colloidal particles evolves with size towards that of the bulk solid, the emission showing a steady enhancement of intensity. Crystallographic investigations coupled with semiempirical computations provide a viable model to describe the range of observations in terms of the gradual accumulation of hierarchical intermolecular interactions.
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Affiliation(s)
- A Patra
- School of Chemistry, University of Hyderabad, Hyderabad, 500 046, India
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