1
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Talukdar S, Ratnam MV. Mutual response hypothesis between surface temperature and aerosol (BC and non-BC) mass concentration observed in an urban environment. Sci Total Environ 2023; 887:164048. [PMID: 37178841 DOI: 10.1016/j.scitotenv.2023.164048] [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] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 05/04/2023] [Accepted: 05/06/2023] [Indexed: 05/15/2023]
Abstract
The mutual response between near surface aerosol concentration and surface temperature works in a complicated manner. A recent study has introduced a hypothesis of mutual response between surface temperature and near surface black carbon (BC) mass concentration which states that 'more fall in morning hour surface temperature (T) contribute to the enhancement of BC fumigation peak after the sunrise which positively impacts the extra rise in mid-day temperature over a region during the day time'. Morning hour surface temperature is proportionally linked with the strength of the night time near surface temperature inversion which contributes to the enhancement of the fumigation peak of BC aerosols after the sunrise and the enhanced fumigation peak can impact the degree of the mid-day surface temperature rise by influencing the instantaneous heating. However, it didn't mention the role of non-BC aerosols. Further, the hypothesis was drawn based on the co-located ground-based observations of surface temperature and BC concentration at a rural location of peninsular India. Though, it was mentioned that the hypothesis can be tested independently of locations, but was not thoroughly validated for an urban environment where the loading of both BC and non-BC aerosols are high. In this context, the first objective of the present work is to methodically test the BC -T hypothesis over an Indian metropolitan city, Kolkata, using the suite of measurements obtained from Kolkata Camp Observatory of NARL (KCON) along with other supporting data. In addition, the validity of the hypothesis for the non-BC fraction of PM2.5 aerosols over the same location is also tested. Besides ascertaining the above-mentioned hypothesis over an urban location, it is found that the enhancement of non-BC PM2.5 aerosols peak after the sunrise can negatively influences the mid-day temperature rise over a region during the day time.
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Affiliation(s)
- S Talukdar
- National Atmospheric Research Laboratory, Gadanki 517112, India
| | - M Venkat Ratnam
- National Atmospheric Research Laboratory, Gadanki 517112, India.
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2
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Repana D, Shanmugalingam T, Gerrard G, Foot N, Kulkarni A, Naidoo K, Talukdar S, Snape K, Hanson H, Quigley K, Mokretar K, Du Parcq P, Ferguson B, Sarker D, Murugaesu N. 31P Liquid biopsies in clinical practice. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.09.032] [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: 11/01/2022] Open
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3
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Venkata Suseela Y, Sengupta P, Roychowdhury T, Panda S, Talukdar S, Chattopadhyay S, Chatterjee S, Govindaraju T. Targeting Oncogene Promoters and Ribosomal RNA Biogenesis by G-Quadruplex Binding Ligands Translate to Anticancer Activity. ACS Bio Med Chem Au 2022; 2:125-139. [PMID: 37101746 PMCID: PMC10114666 DOI: 10.1021/acsbiomedchemau.1c00039] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Abstract
G-Quadruplex (GQ) nucleic acids are promising therapeutic targets in anticancer research due to their structural robustness, polymorphism, and gene-regulatory functions. Here, we presented the structure-activity relationship of carbazole-based monocyanine ligands using region-specific functionalization with benzothiazole (TCA and TCZ), lepidine (LCA and LCZ), and quinaldine (QCA and QCZ) acceptor moieties and evaluated their binding profiles with different oncogenic GQs. Their differential turn-on fluorescence emission upon GQ binding confirmed the GQ-to-duplex selectivity of all carbazole ligands, while the isothermal titration calorimetry results showed selective interactions of TCZ and TCA to c-MYC and BCL-2 GQs, respectively. The aldehyde group in TCA favors stacking interactions with the tetrad of BCL-2 GQ, whereas TCZ provides selective groove interactions with c-MYC GQ. Dual-luciferase assay and chromatin immunoprecipitation (ChIP) showed that these molecules interfere with the recruitment of specific transcription factors at c-MYC and BCL-2 promoters and stabilize the promoter GQ structures to inhibit their constitutive transcription in cancer cells. Their intrinsic turn-on fluorescence response with longer lifetimes upon GQ binding allowed real-time visualization of GQ structures at subcellular compartments. Confocal microscopy revealed the uptake of these ligands in the nucleoli, resulting in nucleolar stress. ChIP studies further confirmed the inhibition of Nucleolin occupancy at multiple GQ-enriched regions of ribosomal DNA (rDNA) promoters, which arrested rRNA biogenesis. Therefore, carbazole ligands act as the "double-edged swords" to arrest c-MYC and BCL-2 overexpression as well as rRNA biogenesis, triggering synergistic inhibition of multiple oncogenic pathways and apoptosis in cancer cells.
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Affiliation(s)
- Yelisetty Venkata Suseela
- Bioorganic
Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, P.O., Bengaluru, Karnataka 560064, India
| | - Pallabi Sengupta
- Department
of Biophysics, Bose Institute, P-1/12 CIT Scheme VII (M), Kankurgachi, Kolkata 700054, India
| | - Tanaya Roychowdhury
- Cancer
Biology and Inflammatory Disorder Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S.C. Mullick Road, Kolkata 700032, India
| | - Suman Panda
- Department
of Biophysics, Bose Institute, P-1/12 CIT Scheme VII (M), Kankurgachi, Kolkata 700054, India
| | - Sangita Talukdar
- Bioorganic
Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, P.O., Bengaluru, Karnataka 560064, India
| | - Samit Chattopadhyay
- Cancer
Biology and Inflammatory Disorder Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S.C. Mullick Road, Kolkata 700032, India
| | - Subhrangsu Chatterjee
- Department
of Biophysics, Bose Institute, P-1/12 CIT Scheme VII (M), Kankurgachi, Kolkata 700054, India
| | - Thimmaiah Govindaraju
- Bioorganic
Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, P.O., Bengaluru, Karnataka 560064, India
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4
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Mandelker D, Donoghue M, Talukdar S, Bandlamudi C, Srinivasan P, Vivek M, Jezdic S, Hanson H, Snape K, Kulkarni A, Hawkes L, Douillard JY, Wallace SE, Rial-Sebbag E, Meric-Bersntam F, George A, Chubb D, Loveday C, Ladanyi M, Berger MF, Taylor BS, Turnbull C. Erratum to 'Germline-focussed analysis of tumour-only sequencing: recommendations from the ESMO Precision Medicine Working Group': [Annals of Oncology 30 (2019) 1221-1231]. Ann Oncol 2021; 32:1069-1071. [PMID: 34090768 PMCID: PMC8929238 DOI: 10.1016/j.annonc.2021.05.798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- D Mandelker
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, USA.
| | - M Donoghue
- Marie-Josee and Henry R. Kravis Center for Molecular Oncology, Memorial Sloan Kettering Cancer Center, New York, USA
| | - S Talukdar
- Department of Clinical Genetics, St George's University of London, London, UK
| | - C Bandlamudi
- Marie-Josee and Henry R. Kravis Center for Molecular Oncology, Memorial Sloan Kettering Cancer Center, New York, USA
| | - P Srinivasan
- Marie-Josee and Henry R. Kravis Center for Molecular Oncology, Memorial Sloan Kettering Cancer Center, New York, USA
| | - M Vivek
- Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, New York, USA; Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, USA
| | - S Jezdic
- European Society for Medical Oncology (ESMO) Head Office, Lugano, Switzerland
| | - H Hanson
- Department of Clinical Genetics, St George's University of London, London, UK
| | - K Snape
- Department of Clinical Genetics, St George's University of London, London, UK
| | - A Kulkarni
- Department ofClinical Genetics, Guy and St Thomas' NHS Foundation Trust, London, UK
| | - L Hawkes
- Department of Clinical Genetics, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
| | - J-Y Douillard
- European Society for Medical Oncology (ESMO) Head Office, Lugano, Switzerland
| | - S E Wallace
- Department of Health Sciences, University of Leicester, Leicester, UK
| | | | - F Meric-Bersntam
- Department of Investigational CancerTherapeutics, The University of Texas MD Anderson Cancer Center, Houston, USA
| | - A George
- Cancer Genetics Unit, The Royal Marsden NHS Foundation Trust, London, UK; Division of Genetics and Epidemiology, Institute of Cancer Research, London, UK
| | - D Chubb
- Division of Genetics and Epidemiology, Institute of Cancer Research, London, UK
| | - C Loveday
- Division of Genetics and Epidemiology, Institute of Cancer Research, London, UK
| | - M Ladanyi
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, USA; Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, New York, USA
| | - M F Berger
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, USA; Marie-Josee and Henry R. Kravis Center for Molecular Oncology, Memorial Sloan Kettering Cancer Center, New York, USA
| | - B S Taylor
- Marie-Josee and Henry R. Kravis Center for Molecular Oncology, Memorial Sloan Kettering Cancer Center, New York, USA; Department of Clinical Genetics, St George's University of London, London, UK; Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, USA
| | - C Turnbull
- Department ofClinical Genetics, Guy and St Thomas' NHS Foundation Trust, London, UK; Division of Genetics and Epidemiology, Institute of Cancer Research, London, UK; William Harvey Research Institute, Queen Mary University of London, London, UK; Public Health England, London, UK.
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5
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Talukdar S, Ratnam MV. A mutual response between surface temperature and black carbon mass concentration during the daytime. Sci Total Environ 2021; 759:143477. [PMID: 33220999 DOI: 10.1016/j.scitotenv.2020.143477] [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] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 10/24/2020] [Accepted: 10/24/2020] [Indexed: 06/11/2023]
Abstract
The mutual response between surface temperature and the mass concentration of regional black carbon (BC) aerosols has still remained far from understanding due to its complex nature. A detailed analysis presented in this study using long-term data indicates a significant pattern of mutual response between surface temperature and BC in restricted background weather conditions (water vapor, cloud cover and wind speeds). The analysis shows that a fall in surface temperature which naturally occurs daily after the sunrise, leads to the development of a stronger inversion in the near-surface level and this, in turn, contributes to the enhancement of BC fumigation peak. Further, the enhanced fumigation peak (especially during pre-monsoon) is found positively influencing the mid-day temperature rise possibly due to the immediate impact of the direct radiative forcing of BC aerosols. These observations lead us to consider a hypothesis that 'an extra fall in the morning hour surface temperature contributes to the enhancement of BC fumigation peak and can degrade the morning hour air quality which gives positive feedback to the mid-day temperature rise over a region'. A substantial in situ data [over Gadanki (13.5°N, 79.2°E)] along with MERRA-2 and ERA-5 data are used in this methodical analysis. Moreover, the validity of the hypothesis has been tested over other locations. Regional weather and seasonal cycle are found to have apparent interference with the feature of the observed mutual response pattern. The results from this study clearly indicate that the approach used, can be executed location independently.
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Affiliation(s)
- S Talukdar
- National Atmospheric Research Laboratory, Gadanki 517112, India.
| | - M Venkat Ratnam
- National Atmospheric Research Laboratory, Gadanki 517112, India
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6
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Talukdar S, Cepela J, Chang Z, Zhang Y, Mullany S, Nelson A, Starr T, Winterhoff B. Development of a predictive signatures for immune therapy in ovarian cancer: Whom to treat and whom not to treat? Gynecol Oncol 2020. [DOI: 10.1016/j.ygyno.2020.06.075] [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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7
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Thomaier L, Hagen J, Henzler C, LaRue R, Talukdar S, Chang Z, Munro S, Mullany S, Starr T, Nelson A, Winterhoff B. Identification of clinically relevant genomic alterations in ovarian cancer: A comparison of a focused cancer next generation sequencing (NGS) assay and whole exome sequencing. Gynecol Oncol 2020. [DOI: 10.1016/j.ygyno.2020.05.460] [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: 10/23/2022]
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8
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Talukdar S, Vasdev R, Ernst M, Hodges P, Rubin N, Gaherty C, Mullany S. Reduced opioid prescribing protocol for postoperative pain management of gynecologic oncology surgery patients. Gynecol Oncol 2020. [DOI: 10.1016/j.ygyno.2020.05.541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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9
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Chang Z, Lee W, Rivers Z, Uppendahl L, Grad A, Talukdar S, Aliferis C, Jacobson P, Starr T, Nelson A, Winterhoff B. Clinical and Germline Molecular Findings From an Ovarian Cancer Precision Medicine Initiative. Gynecol Oncol 2020. [DOI: 10.1016/j.ygyno.2020.04.036] [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: 11/26/2022]
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10
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Mandelker D, Donoghue M, Talukdar S, Bandlamudi C, Srinivasan P, Vivek M, Jezdic S, Hanson H, Snape K, Kulkarni A, Hawkes L, Douillard JY, Wallace SE, Rial-Sebbag E, Meric-Bersntam F, George A, Chubb D, Loveday C, Ladanyi M, Berger MF, Taylor BS, Turnbull C. Germline-focussed analysis of tumour-only sequencing: recommendations from the ESMO Precision Medicine Working Group. Ann Oncol 2020; 30:1221-1231. [PMID: 31050713 PMCID: PMC6683854 DOI: 10.1093/annonc/mdz136] [Citation(s) in RCA: 113] [Impact Index Per Article: 28.3] [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: 02/07/2023] Open
Abstract
It is increasingly common in oncology practice to perform tumour sequencing using large cancer panels. For pathogenic sequence variants in cancer susceptibility genes identified on tumour-only sequencing, it is often unclear whether they are of somatic or constitutional (germline) origin. There is wide-spread disparity regarding both the extent to which systematic 'germline-focussed analysis' is carried out upon tumour sequencing data and for which variants follow-up analysis of a germline sample is carried out. Here we present analyses of paired sequencing data from 17 152 cancer samples, in which 1494 pathogenic sequence variants were identified across 65 cancer susceptibility genes. From these analyses, the European Society of Medical Oncology Precision Medicine Working Group Germline Subgroup has generated (i) recommendations regarding germline-focussed analyses of tumour-only sequencing data, (ii) indications for germline follow-up testing and (iii) guidance on patient information-giving and consent.
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Affiliation(s)
- D Mandelker
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York.
| | - M Donoghue
- Marie-Josee and Henry R. Kravis Center for Molecular Oncology, Memorial Sloan Kettering Cancer Center, New York
| | - S Talukdar
- Department of Clinical Genetics, St George's University of London, London
| | - C Bandlamudi
- Marie-Josee and Henry R. Kravis Center for Molecular Oncology, Memorial Sloan Kettering Cancer Center, New York
| | - P Srinivasan
- Marie-Josee and Henry R. Kravis Center for Molecular Oncology, Memorial Sloan Kettering Cancer Center, New York
| | - M Vivek
- Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, New York, USA; Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, USA
| | - S Jezdic
- European Society for Medical Oncology (ESMO) Head Office, Lugano, Switzerland
| | - H Hanson
- Department of Clinical Genetics, St George's University of London, London
| | - K Snape
- Department of Clinical Genetics, St George's University of London, London
| | - A Kulkarni
- Department of Clinical Genetics, Guy and St Thomas' NHS Foundation Trust, London
| | - L Hawkes
- Department of Clinical Genetics, Oxford University Hospitals NHS Foundation Trust, Oxford
| | - J-Y Douillard
- European Society for Medical Oncology (ESMO) Head Office, Lugano, Switzerland
| | - S E Wallace
- Department of Health Sciences, University of Leicester, Leicester, UK
| | | | - F Meric-Bersntam
- Department of Investigational Cancer Therapeutics, The University of Texas MD Anderson Cancer Center, Houston, USA
| | - A George
- Cancer Genetics Unit, The Royal Marsden NHS Foundation Trust, London; Division of Genetics and Epidemiology, Institute of Cancer Research, London
| | - D Chubb
- Division of Genetics and Epidemiology, Institute of Cancer Research, London
| | - C Loveday
- Division of Genetics and Epidemiology, Institute of Cancer Research, London
| | - M Ladanyi
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York; Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, New York, USA
| | - M F Berger
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York; Marie-Josee and Henry R. Kravis Center for Molecular Oncology, Memorial Sloan Kettering Cancer Center, New York
| | - B S Taylor
- Marie-Josee and Henry R. Kravis Center for Molecular Oncology, Memorial Sloan Kettering Cancer Center, New York; Department of Clinical Genetics, St George's University of London, London; Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, USA
| | - C Turnbull
- Department of Clinical Genetics, Guy and St Thomas' NHS Foundation Trust, London; Division of Genetics and Epidemiology, Institute of Cancer Research, London; William Harvey Research Institute, Queen Mary University of London, London; Public Health England, London, UK.
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11
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Kim T, Duan Z, Talukdar S, Lei C, Kim D, Sessler JL, Sarma T. Excitonically Coupled Cyclic BF
2
Arrays of Calix[8]‐ and Calix[16]phyrin as Near‐IR‐Chromophores. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202004867] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Taeyeon Kim
- Department of Chemistry and Spectroscopy Laboratory for Functional π-Electronic Systems Yonsei University Seoul 03722 Korea
| | - Zhiming Duan
- Center for Supramolecular Chemistry and Catalysis and Department of Chemistry College of Science Shanghai University Shanghai 200444 P. R. China
| | - Sangita Talukdar
- Center for Supramolecular Chemistry and Catalysis and Department of Chemistry College of Science Shanghai University Shanghai 200444 P. R. China
- Department of Physics College of Science Shanghai University 99 Shang-Da Road Shanghai 200444 P. R. China
| | - Chuanhu Lei
- Center for Supramolecular Chemistry and Catalysis and Department of Chemistry College of Science Shanghai University Shanghai 200444 P. R. China
| | - Dongho Kim
- Department of Chemistry and Spectroscopy Laboratory for Functional π-Electronic Systems Yonsei University Seoul 03722 Korea
| | - Jonathan L. Sessler
- Center for Supramolecular Chemistry and Catalysis and Department of Chemistry College of Science Shanghai University Shanghai 200444 P. R. China
- Department of Chemistry The University of Texas at Austin 105 East 24th Street, Stop A5300 Austin TX 78712-1224 USA
| | - Tridib Sarma
- Center for Supramolecular Chemistry and Catalysis and Department of Chemistry College of Science Shanghai University Shanghai 200444 P. R. China
- School of Materials Science and Engineering Shanghai University Shanghai 200444 China
- Department of Chemistry The University of Texas at Austin 105 East 24th Street, Stop A5300 Austin TX 78712-1224 USA
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12
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Abstract
Tertiary alkyl boronates were prepared via the C–O bond borylation of the corresponding oxalates under catalyst-free/(DMF)2–B2cat2 initiated visible light-induced conditions.
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Affiliation(s)
- Guobin Ma
- Center for Supramolecular Chemistry and Catalysis, Department of Chemistry and Department of Physics and Institute for the Conservation of Cultural Heritage
- Shanghai University
- Shanghai 200444
- China
| | - Changzhou Chen
- Center for Supramolecular Chemistry and Catalysis, Department of Chemistry and Department of Physics and Institute for the Conservation of Cultural Heritage
- Shanghai University
- Shanghai 200444
- China
| | - Sangita Talukdar
- Center for Supramolecular Chemistry and Catalysis, Department of Chemistry and Department of Physics and Institute for the Conservation of Cultural Heritage
- Shanghai University
- Shanghai 200444
- China
| | - Xinluo Zhao
- Center for Supramolecular Chemistry and Catalysis, Department of Chemistry and Department of Physics and Institute for the Conservation of Cultural Heritage
- Shanghai University
- Shanghai 200444
- China
| | - Chuanhu Lei
- Center for Supramolecular Chemistry and Catalysis, Department of Chemistry and Department of Physics and Institute for the Conservation of Cultural Heritage
- Shanghai University
- Shanghai 200444
- China
| | - Hegui Gong
- Center for Supramolecular Chemistry and Catalysis, Department of Chemistry and Department of Physics and Institute for the Conservation of Cultural Heritage
- Shanghai University
- Shanghai 200444
- China
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13
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Talukdar S, Cepela J, Chang Z, Zhang Y, Grad A, Mullany S, Starr T, Winterhoff B. Gene expression of programmed cell death (PD-1) and its ligand, PD-L1, in primary epithelial ovarian cancer. Gynecol Oncol 2019. [DOI: 10.1016/j.ygyno.2019.04.586] [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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14
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Bedell S, Chang Z, Zhang Y, Uppendahl L, Grad A, Talukdar S, Wilhite A, Zhang R, Wang J, Mullany S, Starr T, Winterhoff B. Single cell exome analysis of hereditary breast and gynecologic cancer loci. Gynecol Oncol 2019. [DOI: 10.1016/j.ygyno.2019.04.106] [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: 10/26/2022]
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15
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Bag SS, Pradhan MK, Talukdar S. Trifunctional fluorescent unnatural nucleoside: Label free detection of T-T/C-C base mismatches, abasic site and bulge DNA. Journal of Photochemistry and Photobiology B: Biology 2017; 173:165-169. [DOI: 10.1016/j.jphotobiol.2017.05.035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 05/23/2017] [Accepted: 05/24/2017] [Indexed: 10/19/2022]
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16
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Bag SS, Pradhan MK, Talukdar S. Tetrazolylpyrene unnatural nucleoside as a human telomeric multimeric G-quadruplex selective switch-on fluorescent sensor. Org Biomol Chem 2017; 15:10145-10150. [DOI: 10.1039/c7ob02433a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Specific sensing of dimeric H45 G-quadruplex DNA using a fluorescence light-up probe, tetrazolylpyrene nucleoside (TzPyBDo), is reported.
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Affiliation(s)
- Subhendu Sekhar Bag
- Bioorganic Chemistry Laboratory
- Department of Chemistry
- Indian Institute of Technology Guwahati
- North Guwhati-781039
- India
| | - Manoj Kumar Pradhan
- Bioorganic Chemistry Laboratory
- Department of Chemistry
- Indian Institute of Technology Guwahati
- North Guwhati-781039
- India
| | - Sangita Talukdar
- Bioorganic Chemistry Laboratory
- Department of Chemistry
- Indian Institute of Technology Guwahati
- North Guwhati-781039
- India
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17
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Salinas E, Talukdar S, Wagner V, Mott S, Sun W, Goodheart M. Surgery Versus Primary Radiation Therapy as Initial Management in Endometrial Cancer. Gynecol Oncol 2016. [DOI: 10.1016/j.ygyno.2016.08.303] [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: 11/17/2022]
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18
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Tsafrir Z, Janosek-Albright K, Aoun J, Abd-El-Barr AER, Schiff L, Talukdar S, Menon M, Munkarah A, Theoharis E, Eisenstein D. A Wireless Audio System Improves Teamwork and Communication in Robotic Laparoscopic Surgery. J Minim Invasive Gynecol 2016; 22:S8. [PMID: 27679344 DOI: 10.1016/j.jmig.2015.08.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- Z Tsafrir
- Minimally Invasive Gynecologic Surgery, Women's Health Services, Henry Ford Hospital, Detroit, Michigan
| | | | - J Aoun
- Minimally Invasive Gynecologic Surgery, Women's Health Services, Henry Ford Hospital, Detroit, Michigan
| | | | - L Schiff
- Minimally Invasive Gynecologic Surgery, Women's Health Services, Henry Ford Hospital, Detroit, Michigan
| | - S Talukdar
- Minimally Invasive Gynecologic Surgery, Women's Health Services, Henry Ford Hospital, Detroit, Michigan
| | - M Menon
- Vattikuti Urology Institute, Henry Ford Hospital, Detroit, Michigan
| | - A Munkarah
- Minimally Invasive Gynecologic Surgery, Women's Health Services, Henry Ford Hospital, Detroit, Michigan
| | - E Theoharis
- Minimally Invasive Gynecologic Surgery, Women's Health Services, Henry Ford Hospital, Detroit, Michigan
| | - D Eisenstein
- Minimally Invasive Gynecologic Surgery, Women's Health Services, Henry Ford Hospital, Detroit, Michigan
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19
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Schlein C, Talukdar S, Heine M, Fischer A, Krott L, Nilsson S, Brenner M, Heeren J, Scheja L. FGF21 lowers plasma triglycerides by accelerating lipoprotein catabolism in white and brown adipose tissues. Atherosclerosis 2016. [DOI: 10.1016/j.atherosclerosis.2016.07.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Talukdar M, Bordoloi M, Dutta P, Saikia S, Kolita B, Talukdar S, Nath S, Yadav A, Saikia R, Jha D, Bora T. Structure elucidation and biological activity of antibacterial compound from Micromonospora auratinigra
, a soil Actinomycetes. J Appl Microbiol 2016; 121:973-87. [DOI: 10.1111/jam.13233] [Citation(s) in RCA: 9] [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: 01/21/2016] [Revised: 05/20/2016] [Accepted: 07/04/2016] [Indexed: 11/28/2022]
Affiliation(s)
- M. Talukdar
- Biotechnology Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - M. Bordoloi
- Natural Product Chemistry Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - P.P. Dutta
- Natural Product Chemistry Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - S. Saikia
- Natural Product Chemistry Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - B. Kolita
- Natural Product Chemistry Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - S. Talukdar
- Biotechnology Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - S. Nath
- Natural Product Chemistry Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - A. Yadav
- Biotechnology Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - R. Saikia
- Biotechnology Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - D.K. Jha
- Microbial Ecology Laboratory; Department of Botany; Gauhati University; Guwahati Assam India
| | - T.C. Bora
- Biotechnology Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
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Bag SS, Talukdar S, Anjali S. Regioselective and stereoselective route to N2-β-tetrazolyl unnatural nucleosides via SN2 reaction at the anomeric center of Hoffer’s chlorosugar. Bioorg Med Chem Lett 2016; 26:2044-50. [DOI: 10.1016/j.bmcl.2016.02.078] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Revised: 02/17/2016] [Accepted: 02/26/2016] [Indexed: 10/22/2022]
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Lin YF, Hassan Z, Talukdar S, Schat H, Aarts MGM. Expression of the ZNT1 Zinc Transporter from the Metal Hyperaccumulator Noccaea caerulescens Confers Enhanced Zinc and Cadmium Tolerance and Accumulation to Arabidopsis thaliana. PLoS One 2016; 11:e0149750. [PMID: 26930473 PMCID: PMC4773103 DOI: 10.1371/journal.pone.0149750] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [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: 10/12/2015] [Accepted: 02/04/2016] [Indexed: 11/18/2022] Open
Abstract
Prompt regulation of transition metal transporters is crucial for plant zinc homeostasis. NcZNT1 is one of such transporters, found in the metal hyperaccumulator Brassicaceae species Noccaea caerulescens. It is orthologous to AtZIP4 from Arabidopsis thaliana, an important actor in Zn homeostasis. We examined if the NcZNT1 function contributes to the metal hyperaccumulation of N. caerulescens. NcZNT1 was found to be a plasma-membrane located metal transporter. Constitutive overexpression of NcZNT1 in A. thaliana conferred enhanced tolerance to exposure to excess Zn and Cd supply, as well as increased accumulation of Zn and Cd and induction of the Fe deficiency response, when compared to non-transformed wild-type plants. Promoters of both genes were induced by Zn deficiency in roots and shoots of A. thaliana. In A. thaliana, the AtZIP4 and NcZNT1 promoters were mainly active in cortex, endodermis and pericycle cells under Zn deficient conditions. In N. caerulescens, the promoters were active in the same tissues, though the activity of the NcZNT1 promoter was higher and not limited to Zn deficient conditions. Common cis elements were identified in both promoters by 5' deletion analysis. These correspond to the previously determined Zinc Deficiency Responsive Elements found in A. thaliana to interact with two redundantly acting transcription factors, bZIP19 and bZIP23, controlling the Zn deficiency response. In conclusion, these results suggest that NcZNT1 is an important factor in contributing to Zn and Cd hyperaccumulation in N. caerulescens. Differences in cis- and trans-regulators are likely to account for the differences in expression between A. thaliana and N. caerulescens. The high, constitutive NcZNT1 expression in the stele of N. caerulescens roots implicates its involvement in long distance root-to-shoot metal transport by maintaining a Zn/Cd influx into cells responsible for xylem loading.
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Affiliation(s)
- Ya-Fen Lin
- Laboratory of Genetics, Wageningen University and Research Centre, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Zeshan Hassan
- Laboratory of Genetics, Wageningen University and Research Centre, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Sangita Talukdar
- Laboratory of Genetics, Wageningen University and Research Centre, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Henk Schat
- Institute of Molecular and Cellular Biology, Free University of Amsterdam, De Boelelaan 1085, NL-1081 HV, Amsterdam, The Netherlands
| | - Mark G. M. Aarts
- Laboratory of Genetics, Wageningen University and Research Centre, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
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Bag SS, Talukdar S, Das SK, Pradhan MK, Mukherjee S. Donor/acceptor chromophores-decorated triazolyl unnatural nucleosides: synthesis, photophysical properties and study of interaction with BSA. Org Biomol Chem 2016; 14:5088-108. [DOI: 10.1039/c6ob00500d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
We report the syntheses and photophysical properties of some triazolyl donor/acceptor unnatural nucleosides and studies on the interaction of one of the fluorescent nucleosides with BSA.
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Affiliation(s)
- Subhendu Sekhar Bag
- Bio-organic Chemistry Laboratory
- Department of Chemistry
- Indian Institute of Technology Guwahati-781039
- India
| | - Sangita Talukdar
- Bio-organic Chemistry Laboratory
- Department of Chemistry
- Indian Institute of Technology Guwahati-781039
- India
| | - Suman Kalyan Das
- Bio-organic Chemistry Laboratory
- Department of Chemistry
- Indian Institute of Technology Guwahati-781039
- India
| | - Manoj Kumar Pradhan
- Bio-organic Chemistry Laboratory
- Department of Chemistry
- Indian Institute of Technology Guwahati-781039
- India
| | - Soumen Mukherjee
- Bio-organic Chemistry Laboratory
- Department of Chemistry
- Indian Institute of Technology Guwahati-781039
- India
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Abstract
Cancer is a multifactor and multistep process that is affected intrinsically by the genetic and epigenetic makeup of tumor cells and extrinsically by the host microenvironment and immune system. A key component of cancer involves a unique subpopulation of highly malignant cancerous cells referred to as cancer stem cells (CSCs). CSCs are positioned at the apex of the tumor hierarchy with an ability to both self-renew and also generate non-CSC/differentiated progeny, which contribute to the majority of the tumor mass. CSCs undergo functional changes and show plasticity that is stimulated by specific microenvironmental cues and interactions in the tumor niche, which contribute to the complexity and heterogeneity of the CSC population. The prognostic value of CSCs in the clinic is evident since there are many examples in which CSCs serve as markers for poor patient prognosis. CSCs are innately resistant to many standard therapies and they display anoikis resistance, immune evasion, tumor dormancy, and field cancerization, which may result in metastasis and relapse. Many academic laboratories and biotechnology companies are currently focusing on strategies that target CSCs. Combination therapies, epigenetic modifiers, stemness inhibitors, CSC surface marker-based therapies, and immunotherapy-based CSC-targeting drugs are currently undergoing clinical trials. Potential new targets/strategies in CSC-targeted therapy include MDA-9/Syntenin (SDCBP), Patched (PTCH), epigenetic targets, noncoding RNAs, and differentiation induction. Defining ways of targeting and destroying CSCs holds potential to impact significantly on cancer therapy, including prevention of metastasis and cancer recurrence.
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Bhattacharya N, Mukherjee H, Naskar R, Talukdar S, Das G, Pramanik N, Hati AK. Serological diagnosis of dengue in laboratory practice in Kolkata. Indian J Med Microbiol 2015; 32:277-80. [PMID: 25008820 DOI: 10.4103/0255-0857.136563] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
PURPOSE To find out the most suitable serological investigative procedures to diagnose dengue cases effectively in the laboratory practice identifying primary and secondary cases as well as period of suffering. MATERIALS AND METHODS Dengue suspected cases sent to the laboratory in 2012 in central Kolkata by the local physicians were categorised into seven panels according to the investigations asked for such as (1) only dengue-specific NS1 antigen (2) only IgM antibodies, (3) NS1+IgM+IgG antibodies, (4) only IgM and IgG, (5) NS1+IgM, (6) NS1+IgG and (7) only IgG. RESULTS Out of 1892 suspected cases, dengue was diagnosed in 725 (38.3%). Through panels I, II, III, IV, V, VI and VII, it was possible to diagnose dengue in (I) 35.98% (435/1209), (II) 37.5% (24/60), (III) 49% (173/354), (IV) 30.8% (68/221), (V) 60.5% (23/38), (VI) 40% (2/5) and (VII) 0 of cases respectively. Detail information such as confirmed diagnosis, duration of the disease (whether early or prolonged) and classification of primary and secondary dengue in such early or prolonged stages would only be possible in panel III, which information would be helpful for effective monitoring and treatment of dengue patients. In all other panels, merely fragmentary information would be obtained. CONCLUSIONS Serodiagnostic tests dengue-specific NS1 antigen and IgM and IgG antibodies when conducted simultaneously would be able to diagnose confirmed dengue cases categorising primary and secondary dengue along with the duration of the disease, whether early or prolonged.
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Affiliation(s)
| | | | | | | | | | | | - A K Hati
- Calcutta School of Tropical Medicine, Calcutta School of Tropical Medicine, Kolkata, West Bengal, India
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Bag SS, Talukdar S, Das SK. Design and synthesis of triazolyl-donor/acceptor unnatural nucleosides and oligonucleotide probes containing triazolyl-phenanthrene nucleoside. ACTA ACUST UNITED AC 2014; 58:1.32.1-27. [PMID: 25199635 DOI: 10.1002/0471142700.nc0132s58] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
In the context of abasic DNA or DNA duplex stabilization, several unnatural nucleosidic/non-nucleosidic base surrogates have been reported. Toward this end, we have designed and synthesized triazolyl-aromatic donor chomophores as unnatural nucleoside analogs. These modifications display markedly higher thermal stabilization of abasic DNA duplex in comparison to the stabilization offered by other nucleoside/non-nucleoside base surrogates reported in the literature. The same oligonucleotide probe containing triazolylphenanthrene nucleotide also offers very good stability of the self-pair duplex via π-π stacking interaction and hetero-pair duplex via charge transfer interaction when paired against triazolyl acceptor aromatic nucleoside. Moreover, the probe in the reverse sequence containing triazolylphenanthrene nucleotide has shown FRET efficiency in a chimeric DNA duplex. The triazolyl nucleotides would expectedly show stability toward exonuclease activity. This unit describes protocols for chemical synthesis of unnatural triazolyl nucleosides and one oligonucleotide probe. The unit also provides a summary of various thermal and photophysical applications of triazolylphenantherene-containing oligonucleotides.
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Affiliation(s)
- Subhendu Sekhar Bag
- Bio-organic Chemistry Laboratory, Department of Chemistry, Indian Institute of Technology Guwahati, Assam-781039, India
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Rasool N, Talukdar S, Wang Y, Hanna R, Buekers T, Munkarah A, Alford S. Nanoparticle albumin-bound (nab) paclitaxel therapy in patients with primary and recurrent ovarian, fallopian tube, and primary peritoneal carcinoma. Gynecol Oncol 2014. [DOI: 10.1016/j.ygyno.2014.03.192] [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: 10/25/2022]
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Dandolu V, Talukdar S, Sura S. Trend in Apical Prolapse Repairs in Commercially Insured Women in the United States over 15 Years. J Minim Invasive Gynecol 2014. [DOI: 10.1016/j.jmig.2013.12.008] [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: 11/29/2022]
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Bag SS, Talukdar S, Kundu R, Saito I, Jana S. Dual door entry to exciplex emission in a chimeric DNA duplex containing non-nucleoside–nucleoside pair. Chem Commun (Camb) 2014; 50:829-32. [DOI: 10.1039/c3cc46967k] [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: 01/06/2023]
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Bag SS, Kundu R, Talukdar S. Unnatural triazolyl nucleoside stabilizes an abasic site containing DNA duplex equally as the stabilization of a natural A–T pair. RSC Adv 2013. [DOI: 10.1039/c3ra44120b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
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Bag SS, Talukdar S, Matsumoto K, Kundu R. Triazolyl donor/acceptor chromophore decorated unnatural nucleosides and oligonucleotides with duplex stability comparable to that of a natural adenine/thymine pair. J Org Chem 2012; 78:278-91. [PMID: 23171090 DOI: 10.1021/jo302033f] [Citation(s) in RCA: 26] [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: 12/17/2022]
Abstract
We report the design and synthesis of triazolyl donor/acceptor unnatural nucleosides via click chemistry and studies on the duplex stabilization of DNA containing two such new nucleosides. The observed duplex stabilization among the self-pair/heteropair has been found to be comparable to that of a natural A/T pair. Our observations on the comparable duplex stabilization has been explained on the basis of possible π-π stacking and/or charge transfer interactions between the pairing partners. The evidence of ground-state charge transfer complexation came from the UV-vis spectra and the static quenching of fluorescence in a heteropair. We have also exploited one of our unnatural DNAs in stabilizing abasic DNA.
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Affiliation(s)
- Subhendu Sekhar Bag
- Bio-organic Chemistry Laboratory, Department of Chemistry, Indian Institute of Technology, Guwahati-781039, India.
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Talukdar S, Hariprasad R, Gupta A, Mookerjee A, Kumar S, Bhatla N, Mathur S, Kumar L. Malignant ovarian germ cell tumors: Long-term outcome—A single-institution experience. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e15537] [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: 11/20/2022] Open
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Kumar L, Talukdar S, Hariprasad R, Gupta A, Mookerjee A, Kumar S, Bhatla N, Mathur S. Is there a place for neoadjuvant chemotherapy in the management of advanced malignant germ cell tumors of ovary? J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.5079] [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: 11/20/2022] Open
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Assunção AGL, Herrero E, Lin YF, Huettel B, Talukdar S, Smaczniak C, Immink RGH, van Eldik M, Fiers M, Schat H, Aarts MGM. Arabidopsis thaliana transcription factors bZIP19 and bZIP23 regulate the adaptation to zinc deficiency. Proc Natl Acad Sci U S A 2010; 107:10296-301. [PMID: 20479230 PMCID: PMC2890486 DOI: 10.1073/pnas.1004788107] [Citation(s) in RCA: 211] [Impact Index Per Article: 15.1] [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] [Indexed: 01/26/2023] Open
Abstract
Zinc is an essential micronutrient for all living organisms. When facing a shortage in zinc supply, plants adapt by enhancing the zinc uptake capacity. The molecular regulators controlling this adaptation are not known. We present the identification of two closely related members of the Arabidopsis thaliana basic-region leucine-zipper (bZIP) transcription factor gene family, bZIP19 and bZIP23, that regulate the adaptation to low zinc supply. They were identified, in a yeast-one-hybrid screening, to associate to promoter regions of the zinc deficiency-induced ZIP4 gene of the Zrt- and Irt-related protein (ZIP) family of metal transporters. Although mutation of only one of the bZIP genes hardly affects plants, we show that the bzip19 bzip23 double mutant is hypersensitive to zinc deficiency. Unlike the wild type, the bzip19 bzip23 mutant is unable to induce the expression of a small set of genes that constitutes the primary response to zinc deficiency, comprising additional ZIP metal transporter genes. This set of target genes is characterized by the presence of one or more copies of a 10-bp imperfect palindrome in their promoter region, to which both bZIP proteins can bind. The bZIP19 and bZIP23 transcription factors, their target genes, and the characteristic cis zinc deficiency response elements they can bind to are conserved in higher plants. These findings are a significant step forward to unravel the molecular mechanism of zinc homeostasis in plants, allowing the improvement of zinc bio-fortification to alleviate human nutrition problems and phytoremediation strategies to clean contaminated soils.
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Affiliation(s)
- Ana G. L. Assunção
- Laboratory of Genetics, Wageningen University, 6708 PB, Wageningen, The Netherlands
| | - Eva Herrero
- Laboratory of Genetics, Wageningen University, 6708 PB, Wageningen, The Netherlands
| | - Ya-Fen Lin
- Laboratory of Genetics, Wageningen University, 6708 PB, Wageningen, The Netherlands
| | - Bruno Huettel
- Max Planck Institute for Plant Breeding ADIS/DNA Core Facility, D-50829 Cologne, Germany
| | - Sangita Talukdar
- Laboratory of Genetics, Wageningen University, 6708 PB, Wageningen, The Netherlands
| | - Cezary Smaczniak
- Plant Research International, Bioscience, 6708 PB, Wageningen, The Netherlands
| | - Richard G. H. Immink
- Plant Research International, Bioscience, 6708 PB, Wageningen, The Netherlands
- Centre for Biosystems Genomics, Wageningen, 6708 PB, Wageningen, The Netherlands
| | - Mandy van Eldik
- Plant Research International, Applied Bioinformatics, 6708 PB, Wageningen, The Netherlands; and
| | - Mark Fiers
- Plant Research International, Applied Bioinformatics, 6708 PB, Wageningen, The Netherlands; and
| | - Henk Schat
- Department of Genetics, Molecular and Cellular Biology, Vrije Universiteit, 1081 HV, Amsterdam, The Netherlands
| | - Mark G. M. Aarts
- Laboratory of Genetics, Wageningen University, 6708 PB, Wageningen, The Netherlands
- Centre for Biosystems Genomics, Wageningen, 6708 PB, Wageningen, The Netherlands
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Talukdar S, Gallango O, Vallejos C, Ruggiero A. Observations on the Primary Migration of Oil in the la Luna Source Rocks of the Maracaibo Basin, Venezuela. ACTA ACUST UNITED AC 2006. [DOI: 10.2516/ogst:1988022] [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: 11/06/2022]
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Mukhopadhyay A, Talukdar S, Bhattacharjee A, Ray K. Bioinformatic approaches for identification and characterization of olfactomedin related genes with a potential role in pathogenesis of ocular disorders. Mol Vis 2004; 10:304-14. [PMID: 15123989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023] Open
Abstract
PURPOSE To identify olfactomedin domain containing proteins, which are expressed in the eye and have similarity to myocilin, to test as potential candidates for eye diseases. Most of the mutations in myocilin causing primary open angle glaucoma are located in the olfactomedin domain. In vitro experiments demonstrated interaction between optimedin and myocilin through the conserved olfactomedin domains of the proteins in rats, and it was speculated that optimedin might have a role in the pathogenesis of ocular disorders. Hence, we aimed to identify myocilin related human proteins having conserved olfactomedin domains with potential to interact between them and examine the expression patterns in the eye by bioinformatics approaches. This endeavor would have the potential to identify new candidate genes for eye diseases in general and glaucoma in particular to be tested by wet-lab experiments. METHODS Proteins with homology to myocilin were selected by BLASTp at the NCBI server. cDNA sequences and corresponding genomic contigs were retrieved. Pairwise BLAST was done to investigate the gene structure. The human EST database and NEIBank were searched against the selected cDNAs to look for tissue specific expression of the transcripts. RESULTS The study led to the identification of three groups of proteins encoded by three different genes; Noelin 1 (9q34.3), Noelin 2 (19p13.2), and Noelin 3 (1p22) encompassing 45,575 bp, 82,679 bp, and 1,93,421 bp of the genomic sequence, respectively. Genomic structures, alternate usage of exons, and molecular evolution of the Noelins were determined. Similar structures of the genes, splicing patterns and high levels of homology shed light on the relatedness and molecular evolution of this group of olfactomedin related proteins. Strikingly, however, Noelin 1 and Noelin 3 were found to be expressed as multiple splice variants while only a single spliced transcript could be identified for Noelin 2. A human EST database search suggested the expression of all three Noelin genes in the brain but only two (Noelin 1 and Noelin 2) in the eye despite experimental evidence for expression of Noelin 3 in ocular tissue. Myocilin was determined to have similar levels (60-61%) of homology with all three Noelin gene products (Noelin 1_v1, Noelin 2_v1, and Noelin 3_v1) at the conserved olfactomedin domains. CONCLUSIONS Mammalian Noelin 1 evolved from its precursor, followed by evolution of Noelin 3 and Noelin 2 by gene duplication events. Myocilin might have evolved from Noelin 2 by gene duplication followed by exon fusion. Noelin 1 and Noelin 2 could be tested as candidate genes for eye diseases based on their expressions in the eye and shared olfactomedin domains with Myocilin in the C-termini of the respective proteins.
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Affiliation(s)
- Arijit Mukhopadhyay
- Human Genetics & Genomics Division, Indian Institute of Chemical Biology, Kolkata, India
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Talukdar S. Genetic demography of two Dule Bagdi demes. Man India 2002; 59:43-70. [PMID: 12337423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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Talukdar S, Chen RJ, Chen CT, Lo LC, Fang JM. Polymer-supported benzotriazoles as catalysts in the synthesis of tetrahydroquinolines by condensation of aldehydes with aromatic amines. J Comb Chem 2001; 3:341-5. [PMID: 11442390 DOI: 10.1021/cc010010b] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Four polymer-supported benzotriazoles were prepared by linkage of 5-(hydroxymethyl)benzotriazole and benzotrizaole-5-carboxylic acid with Wang resin, Merrifield resin, and (monomethoxy)poly(ethylene glycol). The solid-phase and liquid-phase syntheses of tetrahydroquinolines were achieved by two-pair coupling reactions of aldehydes and aromatic amines using these polymer-supported benzotriazoles as the promoters. The ether-type benzotriazole prepared by loading 5-(hydroxymethyl)benzotriazole onto Merrifield resin turned out to be the catalyst of choice. Thus, a series of tetrahydroquinoline products were obtained in high purity by simple filtration, and the resin was recovered for reuse without loss of activity.
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Affiliation(s)
- S Talukdar
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan, Republic of China
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Rele S, Talukdar S, Banerji A, Chattopadhyay S. Generation of reactive low-valent titanium species using metal--arenes as efficient organic reductants for TiCl(3): applications to organic synthesis. J Org Chem 2001; 66:2990-4. [PMID: 11325263 DOI: 10.1021/jo001586a] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A comprehensive study on the use of metal-arene systems as organic reductants for TiCl(3) has resulted in an efficient method for the generation of highly reactive low-valent titanium (LVT) reagents. The activated titanium species could be prepared by refluxing a mixture of substoichiometric amounts of arenes, TiCl(3), and Li/Mg in THF or DME. Among the LVT reagents screened, TiCl(3)--Li--naphthalene--THF (reagent I) was the best for coupling of carbonyls to olefins. The reagent could carry out the McMurry olefination of both aromatic and aliphatic substrates at a lower temperature and in a much reduced time as compared to the conventional procedures. Subtle changes in the method of preparation of the LVT reagents influenced the stereoisomeric ratio of the olefins. The reagent was also useful for the synthesis of O- and N- heterocycles and vicinal diamines via intramolecular carbonyl coupling and reductive duplication of imines, respectively.
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Affiliation(s)
- S Rele
- Bio-Organic Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
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Affiliation(s)
- S Talukdar
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, Republic of China
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Talukdar CK, Talukdar S, Patgiri SN. Eighth nerve involvement in meningo-encephalitis. J Assoc Physicians India 1994; 42:300-1. [PMID: 7860547] [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: 01/27/2023]
Abstract
Seventy-two patients suffering from meningo-encephalitis were studied, clinically, biochemically, microbiologically and virologically. Evidence of rising titre in serum and CSF of antibodies to Japanese encephalitis were present in 50% of cases, and recent past infection in 20% of cases. Cranial nerve involvement particularly the "8th" was present in 70% of cases though there was a 2.5% involvement of the 2nd, 3rd and 6th nerves. All the patients belonged to plain Tribal population and all had a history of eating pork 7-10 days prior to development of the infection.
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Talukdar S. On age at menopause in India. Man India 1977; 57:345-50. [PMID: 12278698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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