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Tapan chatterjee

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https://www.readbyqxmd.com/read/27398481/use-of-spectroscopic-techniques-to-reveal-the-nature-of-the-interactions-of-two-sialic-acid-specific-lectins-with-gold-nanoparticles
#1
Shuvendu Singha, Gopa Dutta, Partha P Bose, Subrata Das, Munmun Bardhan, Bishnu P Chatterjee, Tapan Ganguly
From UV-vis absorption, steady state and time resolved fluorescence measurements coupled with circular dichroism (CD) spectral studies, it was revealed that among the two lectins: Sambucus nigra agglutinin (SNA) and Saraca indica (saracin II), SNA forms stronger binding complex in the ground state with gold nanoparticles (GNPs). From the measurements of Stern-Volmer (SV) constants Ksv, and binding constants K(A) and number of binding sites two important inferences could be drawn. Firstly, the fluorescence quenching is primarily due to static quenching and secondly SNA forms stronger binding with GNPs relative to the other lectin saracin II...
January 2016: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/27148606/substrate-dependent-aromatic-ring-fission-of-catechol-and-2-aminophenol-with-o2-catalyzed-by-a-nonheme-iron-complex-of-a-tripodal-n4-ligand
#2
Triloke Ranjan Lakshman, Sayanti Chatterjee, Biswarup Chakraborty, Tapan Kanti Paine
The catalytic reactivity of an iron(ii) complex [(TPA)Fe(II)(CH3CN)2](2+) (1) (TPA = tris(2-pyridylmethyl)amine) towards oxygenative aromatic C-C bond cleavage of catechol and 2-aminophenol is presented. Complex 1 exhibits catalytic and regioselective C-C bond cleavage of 3,5-di-tert-butylcatechol (H2DBC) to form intradiol products, whereas it catalyzes extradiol-type C-C bond cleavage of 2-amino-4,6-di-tert-butylphenol (H2AP). The catalytic reactions are found to be pH-dependent and the complex exhibits maximum turnovers at pH 5 in acetonitrile-phthalate buffer...
June 7, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/26828771/linker-induced-structural-diversity-and-photophysical-property-of-mofs-for-selective-and-sensitive-detection-of-nitroaromatics
#3
Tapan K Pal, Nabanita Chatterjee, Parimal K Bharadwaj
The linker [1,1':3',1″-terphenyl]-4,4',4″,6'-tetracarboxylic acid (H4L) was used to construct two three-dimensional (3D) metal-organic frameworks (MOFs), namely, {[Cd2(L)(L1)(DMF)(H2O)](2DMF)(3H2O)}n (1) and {[Cd4(L)2(L2)3(H2O)2](8DMF)(8H2O)}n (2) (DMF = N,N'-dimethylformamide) in the presence of colinkers 4,4'-bipyridine (L1) and 2-amino-4,4'-bipyridine (L2), respectively, under solvothermal condition. A small change in the colinker leads to significant differences in the overall structure of the MOFs...
February 15, 2016: Inorganic Chemistry
https://www.readbyqxmd.com/read/26822989/hydroxylation-versus-halogenation-of-aliphatic-c-h-bonds-by-a-dioxygen-derived-iron-oxygen-oxidant-functional-mimicking-of-iron-halogenases
#4
Sayanti Chatterjee, Tapan Kanti Paine
An iron-oxygen intermediate species generated in situ in the reductive activation of dioxygen by an iron(II)-benzilate complex of a monoanionic facial N3 ligand, promoted the halogenation of aliphatic C-H bonds in the presence of a protic acid and a halide anion. An electrophilic iron(IV)-oxo oxidant with a coordinated halide is proposed as the active oxidant. The halogenation reaction with dioxygen and the iron complex mimics the activity of non-heme iron halogenases.
June 27, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/26467254/red-blood-cell-dysfunction-induced-by-high-fat-diet-potential-implications-for-obesity-related-atherosclerosis
#5
Dusten Unruh, Ramprasad Srinivasan, Tyler Benson, Stephen Haigh, Danielle Coyle, Neil Batra, Ryan Keil, Robert Sturm, Victor Blanco, Mary Palascak, Robert S Franco, Wilson Tong, Tapan Chatterjee, David Y Hui, W Sean Davidson, Bruce J Aronow, Theodosia Kalfa, David Manka, Abigail Peairs, Andra Blomkalns, David J Fulton, Julia E Brittain, Neal L Weintraub, Vladimir Y Bogdanov
BACKGROUND: High-fat diet (HFD) promotes endothelial dysfunction and proinflammatory monocyte activation, which contribute to atherosclerosis in obesity. We investigated whether HFD also induces the dysfunction of red blood cells (RBCs), which serve as a reservoir for chemokines via binding to Duffy antigen receptor for chemokines (DARC). METHODS AND RESULTS: A 60% HFD for 12 weeks, which produced only minor changes in lipid profile in C57/BL6 mice, markedly augmented the levels of monocyte chemoattractant protein-1 bound to RBCs, which in turn stimulated macrophage migration through an endothelial monolayer...
November 17, 2015: Circulation
https://www.readbyqxmd.com/read/26317058/role-of-histone-deacetylase-9-in-regulating-adipogenic-differentiation-and-high-fat-diet-induced-metabolic-disease
#6
Tapan K Chatterjee, Joshua E Basford, Kan Hui Yiew, David W Stepp, David Y Hui, Neal L Weintraub
Adipose tissue serves as both a storage site for excess calories and as an endocrine organ, secreting hormones such as adiponectin that promote metabolic homeostasis. In obesity, adipose tissue expands primarily by hypertrophy (enlargement of existing adipocytes) rather than hyperplasia (generation of new adipocytes via adipogenic differentiation of preadipocytes). Progressive adipocyte hypertrophy leads to inflammation, insulin resistance, dyslipidemia, and ectopic lipid deposition, the hallmark characteristics of metabolic disease...
October 2014: Adipocyte
https://www.readbyqxmd.com/read/26183616/histone-deacetylases-and-cardiometabolic-diseases
#7
REVIEW
Kan Hui Yiew, Tapan K Chatterjee, David Y Hui, Neal L Weintraub
Cardiometabolic disease, emerging as a worldwide epidemic, is a combination of metabolic derangements leading to type 2 diabetes mellitus and cardiovascular disease. Genetic and environmental factors are linked through epigenetic mechanisms to the pathogenesis of cardiometabolic disease. Post-translational modifications of histone tails, including acetylation and deacetylation, epigenetically alter chromatin structure and dictate cell-specific gene expression patterns. The histone deacetylase family comprises 18 members that regulate gene expression by altering the acetylation status of nucleosomal histones and by functioning as nuclear transcriptional corepressors...
September 2015: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/26107050/comparison-of-redox-activity-between-2-aminothioether-and-2-aminothiophenol-redox-induced-dimerization-of-2-aminothioether-via-c-c-coupling
#8
Pradip Ghosh, Sutanuva Mandal, Ipsita Chatterjee, Tapan Kumar Mondal, Sreebrata Goswami
Three chemical reactions of two 2-aminothioethers and 2-aminothiophenol with CpRu(II)Cl(PPh3)2 (Cp(-) = cyclopentadienyl anion), under identical reaction conditions, are reported. While 2-(methylthio)aniline, H2L(1) and an analogous substrate, 2-(phenylthio)aniline yielded dicationic dinuclear complexes [(PPh3)CpRu(II)(L(3/)L(4))Ru(II)Cp(PPh3)]Cl2 (where L(3) = (4E)-4-(4-imino-3-(methylthio)cyclohexa-2,5-dienylidene)-2-(methylthio)cyclohexa-2,5-dienimine ([1a]Cl2) and L(4) = (4E)-4-(4-imino-3-(phenylthio)cyclohexa-2,5-dienylidene)-2-(phenylthio)cyclohexa-2,5-dienimine ([1b]Cl2)), the reaction with 2-aminothiophenol (H2L(2)) produced a mononuclear complex [(PPh3)CpRu(II)(L(2))]Cl (where L(2) = 6-iminocyclohexa-2,4-dienethione) ([2]Cl)...
July 6, 2015: Inorganic Chemistry
https://www.readbyqxmd.com/read/26088714/olefin-cis-dihydroxylation-and-aliphatic-c-h-bond-oxygenation-by-a-dioxygen-derived-electrophilic-iron-oxygen-oxidant
#9
Sayanti Chatterjee, Tapan Kanti Paine
Many iron-containing enzymes involve metal-oxygen oxidants to carry out O2-dependent transformation reactions. However, the selective oxidation of C-H and C=C bonds by biomimetic complexes using O2 remains a major challenge in bioinspired catalysis. The reactivity of iron-oxygen oxidants generated from an Fe(II)-benzilate complex of a facial N3 ligand were thus investigated. The complex reacted with O2 to form a nucleophilic oxidant, whereas an electrophilic oxidant, intercepted by external substrates, was generated in the presence of a Lewis acid...
August 3, 2015: Angewandte Chemie
https://www.readbyqxmd.com/read/26000650/a-novel-triterpene-from-astraeus-hygrometricus-induces-reactive-oxygen-species-leading-to-death-in-leishmania-donovani
#10
Suvadip Mallick, Somaditya Dey, Supratim Mandal, Aritri Dutta, Debarati Mukherjee, Gunjan Biswas, Soumya Chatterjee, Sanjaya Mallick, Tapan Kumar Lai, Krishnendu Acharya, Chiranjib Pal
AIM: The effect of astrakurkurone, a novel triterpene, isolated from Indian mushroom Astraeus hygrometricus has been investigated to elucidate the mechanisms involved in selective cell death of Leishmania donovani. MATERIALS & METHODS: The hypotheses were investigated using flow-cytometry, scanning electron microscopy and confocal microscopy. RESULTS: The time dependent elevation of astrakurkurone-induced reactive oxygen species (ROS) was found intimately associated with apoptosis...
2015: Future Microbiology
https://www.readbyqxmd.com/read/25646806/oxygenative-aromatic-ring-cleavage-of-2-aminophenol-with-dioxygen-catalyzed-by-a-nonheme-iron-complex-catalytic-functional-model-of-2-aminophenol-dioxygenases
#11
Sayanti Chatterjee, Tapan Kanti Paine
2-Aminophenol dioxygenases catalyze the oxidative ring cleavage of 2-aminophenol to 2-picolinic acid using O2 as the oxidant. Inspired by the reaction catalyzed by these nonheme iron enzymes, a biomimetic iron(III)-2-amidophenolate complex, [(tBu-L(Me))Fe(III)(4,6-di-tBu-AP)](ClO4) (1a) of a facial tridentate ligand (tBu-L(Me) = 1-[bis(6-methyl-pyridin-2-yl)-methyl]-3-tert-butyl-urea and 4,6-di-tBu-H2AP = 2-amino-4,6-di-tert-butylphenol) bearing a urea group have been isolated. The complex reacts with O2 to cleave the C-C bond of 4,6-di-tBu-AP regioselectively and catalytically to afford 4,6-di-tert-butyl-2-picolinic acid...
February 16, 2015: Inorganic Chemistry
https://www.readbyqxmd.com/read/25451536/deficiency-in-nrf2-transcription-factor-decreases-adipose-tissue-mass-and-hepatic-lipid-accumulation-in-leptin-deficient-mice
#12
Jialin Xu, Ajay C Donepudi, Vijay R More, Supriya R Kulkarni, Liya Li, Liangran Guo, Bingfang Yan, Tapan Chatterjee, Neal Weintraub, Angela L Slitt
OBJECTIVE: To evaluate whether Nrf2 deficiency impacts insulin resistance and lipid accumulation in liver and white adipose tissue. METHODS: Lep(ob/ob) mice (OB) with targeted Nrf2 deletion (OB-Nrf2KO) were generated. Pathogenesis of obesity and type 2 diabetes was measured in C57BL/6J, Nrf2KO, OB, and OB-Nrf2KO mice. Hepatic lipid content, lipid clearance, and very low-density lipoprotein (VLDL) secretion were determined between OB and OB-Nrf2KO mice. RESULTS: OB-Nrf2KO mice exhibited decreased white adipose tissue mass and decreased adipogenic and lipogenic gene expression compared with OB mice...
February 2015: Obesity
https://www.readbyqxmd.com/read/24987581/an-evaluation-of-knowledge-attitude-and-practice-of-institutional-ethics-committee-members-from-eastern-india-regarding-ethics-committee-functioning-and-pharmacovigilance-activities-conducted-during-clinical-trials-a-pilot-study
#13
Subhrojyoti Bhowmick, Koyel Banerjee, Shreya Sikdar, Tapan Kumar Chatterjee
PURPOSE OF STUDY: The vital responsibility of Institutional Ethics Committee (IEC) members is to ensure the safety of the subjects participating in clinical trials. Hence, it is essential for IEC members to be aware of the common pharmacovigilance strategies followed during clinical trials. However, the information about the knowledge, attitude, and practice of IEC members regarding the pharmacovigilance activities followed during clinical trials is scarce worldwide, especially in India...
July 2014: Perspectives in Clinical Research
https://www.readbyqxmd.com/read/24947528/transplanted-perivascular-adipose-tissue-accelerates-injury-induced-neointimal-hyperplasia-role-of-monocyte-chemoattractant-protein-1
#14
David Manka, Tapan K Chatterjee, Lynn L Stoll, Joshua E Basford, Eddy S Konaniah, Ramprasad Srinivasan, Vladimir Y Bogdanov, Yaoliang Tang, Andra L Blomkalns, David Y Hui, Neal L Weintraub
OBJECTIVE: Perivascular adipose tissue (PVAT) expands during obesity, is highly inflamed, and correlates with coronary plaque burden and increased cardiovascular risk. We tested the hypothesis that PVAT contributes to the vascular response to wire injury and investigated the underlying mechanisms. APPROACH AND RESULTS: We transplanted thoracic aortic PVAT from donor mice fed a high-fat diet to the carotid arteries of recipient high-fat diet-fed low-density lipoprotein receptor knockout mice...
August 2014: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/24925977/proinflammatory-phenotype-of-perivascular-adipocytes
#15
REVIEW
Abdullah Omar, Tapan K Chatterjee, Yaoliang Tang, David Y Hui, Neal L Weintraub
Perivascular adipose tissue (PVAT) directly abuts the lamina adventitia of conduit arteries and actively communicates with the vessel wall to regulate vascular function and inflammation. Mounting evidence suggests that the biological activities of PVAT are governed by perivascular adipocytes, a unique class of adipocyte with distinct molecular and phenotypic characteristics. Perivascular adipocytes surrounding human coronary arteries (pericoronary perivascular adipocytes) exhibit a reduced state of adipogenic differentiation and a heightened proinflammatory state, secreting ≤50-fold higher levels of the proinflammatory cytokine monocyte chemoattractant peptide-1 compared with adipocytes from other regional depots...
August 2014: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/24716175/protective-effect-of-ethyl-acetate-fraction-of-stereospermum-suaveolens-against-hepatic-oxidative-stress-in-stz-diabetic-rats
#16
Thirumalaiswamy Balasubramanian, G P Senthilkumar, M Karthikeyan, Tapan Kumar Chatterjee
Stereospermum suaveolens is a folk remedy for the treatment of diabetes and liver disorders in southern parts of India. In the present study, the protective effect of the ethyl acetate fraction of ethanol extract from S. suaveolens against hepatic oxidative stress was evaluated in streptozotocin (STZ)-induced diabetic rats for 14 days. The ethyl acetate fraction was administered orally to the STZ diabetic rats at the doses of 200 and 400 mg/kg. Blood glucose level was measured according to glucose oxidase method...
July 2013: Journal of Traditional and Complementary Medicine
https://www.readbyqxmd.com/read/24627956/reactivity-of-an-iron-oxygen-oxidant-generated-upon-oxidative-decarboxylation-of-biomimetic-iron-ii-%C3%AE-hydroxy-acid-complexes
#17
Sayantan Paria, Sayanti Chatterjee, Tapan Kanti Paine
Three biomimetic iron(II) α-hydroxy acid complexes, [(Tp(Ph2))Fe(II)(mandelate)(H2O)] (1), [(Tp(Ph2))Fe(II)(benzilate)] (2), and [(Tp(Ph2))Fe(II)(HMP)] (3), together with two iron(II) α-methoxy acid complexes, [(Tp(Ph2))Fe(II)(MPA)] (4) and [(Tp(Ph2))Fe(II)(MMP)] (5) (where HMP = 2-hydroxy-2-methylpropanoate, MPA = 2-methoxy-2-phenylacetate, and MMP = 2-methoxy-2-methylpropanoate), of a facial tridentate ligand Tp(Ph2) [where Tp(Ph2) = hydrotris(3,5-diphenylpyrazole-1-yl)borate] were isolated and characterized to study the mechanism of dioxygen activation at the iron(II) centers...
March 17, 2014: Inorganic Chemistry
https://www.readbyqxmd.com/read/24449865/development-of-pattern-vision-following-early-and-extended-blindness
#18
Amy Kalia, Luis Andres Lesmes, Michael Dorr, Tapan Gandhi, Garga Chatterjee, Suma Ganesh, Peter J Bex, Pawan Sinha
Visual plasticity peaks during early critical periods of normal visual development. Studies in animals and humans provide converging evidence that gains in visual function are minimal and deficits are most severe when visual deprivation persists beyond the critical period. Here we demonstrate visual development in a unique sample of patients who experienced extended early-onset blindness (beginning before 1 y of age and lasting 8-17 y) before removal of bilateral cataracts. These patients show surprising improvements in contrast sensitivity, an assay of basic spatial vision...
February 4, 2014: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/24394703/inhibition-of-stearoyl-coa-desaturase-selectively-eliminates-tumorigenic-nanog-positive-cells-improving-the-safety-of-ips-cell-transplantation-to-myocardium
#19
Lan Zhang, Yaohua Pan, Gangjian Qin, Lijuan Chen, Tapan K Chatterjee, Neal L Weintraub, Yaoliang Tang
Induced pluripotent stem cells (iPS) can differentiate into cardiomyocytes (CM) and represent a promising form of cellular therapy for heart regeneration. However, residual undifferentiated iPS derivates (iPSD), which are not fully eliminated by cell differentiation or purification protocols, may form tumors after transplantation, thus compromising therapeutic application. Inhibition of stearoyl-coA desaturase (SCD) has recently been reported to eliminate undifferentiated human embryonic stem cells, which share many features with iPSD...
2014: Cell Cycle
https://www.readbyqxmd.com/read/24358024/restoring-vision-through-project-prakash-the-opportunities-for-merging-science-and-service
#20
Pawan Sinha, Garga Chatterjee, Tapan Gandhi, Amy Kalia
No abstract text is available yet for this article.
December 2013: PLoS Biology
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