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Mehta H, Swapna P, Jiandani P, Nagvekar V, Soni G. The Long and Short of COVID-19. J Med Res 2022. [DOI: 10.31254/jmr.2022.8301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
COVID-19 illness is self-limiting illness in majority of patients, but some patients continue to have or develop new medical issues four weeks after suffering from the infection (proven or presumed), and have been labelled as Long Covid, which depicts the consequences of COVID-19.The duration of Long Covid beyond 4 weeks is unknown. We are reporting a case of a young female who presented with encephalopathy which was due to asymptomatic COVID-19 infection suffered in the past. Could this be a Long Covid syndrome? How was the diagnosis of Covid encephalopathy suspected and investigated, with its treatment and review of relevant literature is described
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Singh M, Krishnan R, Goswami B, Choudhury AD, Swapna P, Vellore R, Prajeesh AG, Sandeep N, Venkataraman C, Donner RV, Marwan N, Kurths J. Fingerprint of volcanic forcing on the ENSO-Indian monsoon coupling. Sci Adv 2020; 6:6/38/eaba8164. [PMID: 32948581 PMCID: PMC7500933 DOI: 10.1126/sciadv.aba8164] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 07/31/2020] [Indexed: 06/11/2023]
Abstract
Coupling of the El Niño-Southern Oscillation (ENSO) and Indian monsoon (IM) is central to seasonal summer monsoon rainfall predictions over the Indian subcontinent, although a nonstationary relationship between the two nonlinear phenomena can limit seasonal predictability. Radiative effects of volcanic aerosols injected into the stratosphere during large volcanic eruptions (LVEs) tend to alter ENSO evolution; however, their impact on ENSO-IM coupling remains unclear. Here, we investigate how LVEs influence the nonlinear behavior of the ENSO and IM dynamical systems using historical data, 25 paleoclimate reconstructions, last-millennium climate simulations, large-ensemble targeted climate sensitivity experiments, and advanced analysis techniques. Our findings show that LVEs promote a significantly enhanced phase-synchronization of the ENSO and IM oscillations, due to an increase in the angular frequency of ENSO. The results also shed innovative insights into the physical mechanism underlying the LVE-induced enhancement of ENSO-IM coupling and strengthen the prospects for improved seasonal monsoon predictions.
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Affiliation(s)
- M Singh
- Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune, India
- IDP in Climate Studies, Indian Institute of Technology, Bombay, India
| | - R Krishnan
- Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune, India.
| | - B Goswami
- Potsdam Institute for Climate Impact Research, Potsdam, Germany
- Cluster of Excellence "Machine Learning in Science", University of Tübingen, Tübingen, Germany
| | - A D Choudhury
- Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune, India
| | - P Swapna
- Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune, India
| | - R Vellore
- Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune, India
| | - A G Prajeesh
- Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune, India
| | - N Sandeep
- Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune, India
| | - C Venkataraman
- IDP in Climate Studies, Indian Institute of Technology, Bombay, India
| | - R V Donner
- Potsdam Institute for Climate Impact Research, Potsdam, Germany
- Magdeburg-Stendal University of Applied Sciences, Magdeburg, Germany
| | - N Marwan
- Potsdam Institute for Climate Impact Research, Potsdam, Germany
| | - J Kurths
- Potsdam Institute for Climate Impact Research, Potsdam, Germany
- Lobachevsky State University Nizhny Novgorod, Nizhny Novgorod, Russia
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Narasimha Rao MP, Nagaraju B, Kovvuri J, Polepalli S, Alavala S, Vishnuvardhan MVPS, Swapna P, Nimbarte VD, Lakshmi JK, Jain N, Kamal A. Synthesis of imidazo-thiadiazole linked indolinone conjugates and evaluated their microtubule network disrupting and apoptosis inducing ability. Bioorg Chem 2017; 76:420-436. [PMID: 29275261 DOI: 10.1016/j.bioorg.2017.11.021] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Revised: 11/04/2017] [Accepted: 11/30/2017] [Indexed: 10/18/2022]
Abstract
A series of imidazo[2,1-b][1,3,4]thiadiazole linked indolinone conjugates were synthesized and investigated for antiproliferative activity in different human cancer cell lines by changing various substitutions at indolinone and phenyl ring systems. Among them conjugates 7, 14 and 15 were exhibited potent antiproliferative activity with GI50 values from 0.13 to 3.8 μΜ and evaluated for cell cycle analysis, tubulin polymerization assay and apoptosis. Treatment with 7, 14 and 15 were resulted in accumulation of cells in G2/M phase, inhibition of tubulin assembly, disruption of microtubule network. Inhibition of tubulin polymerization was further supported by Western blot analysis. In addition, the conjugates (7, 14 and 15) also showed apoptosis in HeLa cell line, detailed biological studies such as Hoechst 33,258 staining, DNA fragmentation and caspase-3 assays suggested that these compounds induce cell death by apoptosis. Docking studies revealed that these compounds (7, 14 and 15) bind with αAsn101, αThr179, αSer178, βCys241, βLys254 and βLys352 in the colchicine-binding site of the tubulin.
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Affiliation(s)
- M P Narasimha Rao
- Medicinal Chemistry and Biotechnology Division, CSIR - Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - Burri Nagaraju
- Medicinal Chemistry and Biotechnology Division, CSIR - Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - Jeshma Kovvuri
- Medicinal Chemistry and Biotechnology Division, CSIR - Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - Sowjanya Polepalli
- Centre for Chemical Biology Division, CSIR - Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - Sateesh Alavala
- Pharmacology & Toxicology Division, CSIR - Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - M V P S Vishnuvardhan
- Medicinal Chemistry and Biotechnology Division, CSIR - Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - P Swapna
- Medicinal Chemistry and Biotechnology Division, CSIR - Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - Vijaykumar D Nimbarte
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Educational & Research, Hyderabad 500 037, India
| | - Jerripothula K Lakshmi
- Centre for Nuclear Magnetic Resonance & Structural Chemistry, CSIR - Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - Nishant Jain
- Centre for Chemical Biology Division, CSIR - Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - Ahmed Kamal
- Medicinal Chemistry and Biotechnology Division, CSIR - Indian Institute of Chemical Technology, Hyderabad 500 007, India; Pharmacology & Toxicology Division, CSIR - Indian Institute of Chemical Technology, Hyderabad 500 007, India.
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Kamal A, Rao MPN, Swapna P, Srinivasulu V, Bagul C, Shaik AB, Mullagiri K, Kovvuri J, Reddy VS, Vidyasagar K, Nagesh N. Synthesis of β-carboline-benzimidazole conjugates using lanthanum nitrate as a catalyst and their biological evaluation. Org Biomol Chem 2014; 12:2370-87. [PMID: 24604306 DOI: 10.1039/c3ob42236d] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A series of β-carboline-benzimidazole conjugates bearing a substituted benzimidazole and an aryl ring at C3 and C1 respectively were designed and synthesized. The key step of their preparation was determined to involve condensation of substituted o-phenylenediamines with 1-(substituted phenyl)-9H-pyrido[3,4-b]indole-3-carbaldehyde using La(NO3)3·6H2O as a catalyst and their cytotoxic potential was evaluated. Conjugates 5a, 5d, 5h and 5r showed enhanced cytotoxic activity (GI50 values range from 0.3 to 7.1 μM in most of the human cancer cell lines) in comparison to some of the previously reported β-carboline derivatives. To substantiate the cytotoxic activity and to understand the nature of interaction of these conjugates with DNA, spectroscopy, DNA photocleavage and DNA topoisomerase I inhibition (topo-I) studies were performed. These conjugates (5a, 5d and 5r) effectively cleave pBR322 plasmid DNA in the presence of UV light. In addition, the effect of these conjugates on DNA Topo I inhibition was studied. The mode of binding of these new conjugates with DNA was also examined by using both biophysical as well as molecular docking studies, which supported their multiple modes of interaction with DNA. Moreover, an in silico study of these β-carboline-benzimidazole conjugates reveals that they possess drug-like properties.
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Affiliation(s)
- Ahmed Kamal
- Medicinal Chemistry and Pharmacology, CSIR - Indian Institute of Chemical Technology, Hyderabad 500 007, India.
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Kamal A, Rao MPN, Das P, Swapna P, Polepalli S, Nimbarte VD, Mullagiri K, Kovvuri J, Jain N. Synthesis and Biological Evaluation of Imidazo[2,1-b][1,3,4]thiadiazole-Linked Oxindoles as Potent Tubulin Polymerization Inhibitors. ChemMedChem 2014; 9:1463-75. [DOI: 10.1002/cmdc.201400069] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Indexed: 01/06/2023]
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Kamal A, Swapna P, Shetti RV, Shaik AB, Narasimha Rao M, Sultana F, Khan IA, Sharma S, Kalia NP, Kumar S, Chandrakant B. Anti-tubercular agents. Part 7: A new class of diarylpyrrole–oxazolidinone conjugates as antimycobacterial agents. Eur J Med Chem 2013; 64:239-51. [DOI: 10.1016/j.ejmech.2013.03.027] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2012] [Revised: 03/10/2013] [Accepted: 03/13/2013] [Indexed: 10/27/2022]
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Kamal A, Shetti RV, Azeeza S, Swapna P, Khan MNA, Khan IA, Sharma S, Abdullah ST. Anti-tubercular agents. Part 6: Synthesis and antimycobacterial activity of novel arylsulfonamido conjugated oxazolidinones. Eur J Med Chem 2011; 46:893-900. [DOI: 10.1016/j.ejmech.2010.12.028] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2010] [Revised: 12/06/2010] [Accepted: 12/28/2010] [Indexed: 10/18/2022]
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Kamal A, Shetti RVCRNC, Ramaiah MJ, Swapna P, Reddy KS, Mallareddy A, Rao MPN, Chourasia M, Sastry GN, Juvekar A, Zingde S, Sarma P, Pushpavalli SNCVL, Pal-Bhadra M. Carbazole–pyrrolo[2,1-c][1,4]benzodiazepine conjugates: design, synthesis, and biological evaluation. Med Chem Commun 2011. [DOI: 10.1039/c1md00072a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Kamal A, Shetti RV, Azeeza S, Ahmed SK, Swapna P, Reddy AM, Khan IA, Sharma S, Abdullah ST. Anti-tubercular agents. Part 5: Synthesis and biological evaluation of benzothiadiazine 1,1-dioxide based congeners. Eur J Med Chem 2010; 45:4545-53. [DOI: 10.1016/j.ejmech.2010.07.015] [Citation(s) in RCA: 16] [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: 04/29/2010] [Revised: 07/05/2010] [Accepted: 07/06/2010] [Indexed: 11/17/2022]
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