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Sengupta A, Rajeswari B, Kadam RM, Kshirsagar RJ. Characterization of serpentine: a potential nuclear shielding material. J Radioanal Nucl Chem 2011. [DOI: 10.1007/s10967-011-1535-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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77
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Adya VC, Sengupta A, Dhawale BA, Rajeswari B, Thulasidas SK, Godbole SV. Recovery of americium from analytical solid waste containing large amounts of uranium, plutonium and silver. J Radioanal Nucl Chem 2011. [DOI: 10.1007/s10967-011-1360-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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78
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Sengupta A, Kulkarni MJ, Godbole SV. Analytical application of DHOA for the determination of trace metallic constituents in U based fuel materials by ICP-AES. J Radioanal Nucl Chem 2011. [DOI: 10.1007/s10967-011-1222-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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79
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Jordan LB, Vekeman F, Sengupta A, Corral M, Guo A, Duh MS. Persistence and compliance of deferoxamine versus deferasirox in Medicaid patients with sickle-cell disease. J Clin Pharm Ther 2011; 37:173-81. [DOI: 10.1111/j.1365-2710.2011.01276.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Mahdmina A, Rudralingam M, Sengupta A. Differential diagnosis. Br Dent J 2011; 210:291. [PMID: 21475258 DOI: 10.1038/sj.bdj.2011.244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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81
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Agarwal N, Nagananda MS, Rahman SMK, Sengupta A, Santhosh J, Anand S. Portable cost-effective EEG data acquisition system. J Med Eng Technol 2011; 35:185-90. [PMID: 21406039 DOI: 10.3109/03091902.2011.560701] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Neuro-cognitive dysfunctions are common clinical abnormalities found in society. They require objective analysis by various instruments; an important technique involves monitoring electroencephalogram (EEG) signals. To date, EEG machines have been robust, costly and require patients to come to a hospital for test. Therefore, we have constructed a simple, cheap and portable EEG instrument for wider patient use. It consists of two active digital EEG probes with two channels each, making it a four-channel portable acquisition system. It is further connected through a two-wire serial bus to the acquisition unit, which comprises an analogue to digital converter (ADC) and an ARM board processor with 2 GB memory and USB interface. The whole system is placed in a small box making it highly portable for wider use in clinical settings.
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Sengupta A, Bax G, Paterson-Brown S. AUTHORS' RESPONSE. Ann R Coll Surg Engl 2011. [DOI: 10.1308/003588411x562007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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83
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Gujar RB, Ansari SA, Prabhu DR, Raut DR, Pathak PN, Sengupta A, Thulasidas SK, Mohapatra PK, Manchanda VK. Demonstration of T2EHDGA Based Process for Actinide Partitioning Part II: Counter-Current Extraction Studies. SOLVENT EXTRACTION AND ION EXCHANGE 2010. [DOI: 10.1080/07366299.2010.509684] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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84
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Maitra S, Dey M, Panja A, Bhattacharya S, Dey R, Sengupta A. Diurnal Profiles of Blood Glucose in Relation to Time of Administration of Melatonin in Male Spotted Munia (Lonchura punctulata). BIOL RHYTHM RES 2010. [DOI: 10.1076/0929-1016(200004)31:2;1-u;ft220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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85
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Maitra SK, Dey M, Chopra S, Dey R, Sengupta A, Bhattacharya S. Effects of Pinealectomy and Exogenous Melatonin on the Thyroid Gland Activity Varies in Relation to Reproductive Status of Male Spotted Munia (Lonchura punctulata; Aves, Passeriformes). BIOL RHYTHM RES 2010. [DOI: 10.1076/0929-1016(200010)31:4;1-2;ft437] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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86
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Mukhopadhyay AS, Mukherjee J, Sengupta A. The role of dynamisation vis-à-vis non-dynamisation after closed interlocking nailing in cases of closed tibial shaft fractures in adults. JOURNAL OF THE INDIAN MEDICAL ASSOCIATION 2010; 108:361-364. [PMID: 21121386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The importance of dynamisation after static locked nailing in comminuted closed tibial fractures is a matter of contention. A prospective study was undertaken among 178 patients in the department of orthopaedics at RG Kar Medical College, Kolkata from January 2002 to December 2006, to analyse the usefulness of this procedure with respect to the degree of comminution. In this study it was seen that dynamisation was found to be of statistical significance in relatively less comminuted fractures as per Winquist-Hansen's classification.
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Dey A, Bhuniya S, Datta Chaudhuri A, Pandit S, Saha-Dutta Chowdhury M, Sengupta A, Saha I, De P. Iodopovidone pleurodesis: experience of a tertiary hospital in Kolkata. Singapore Med J 2010; 51:163-165. [PMID: 20358157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
INTRODUCTION The management of recurrent pleural effusion or pneumothorax has always been a cause for serious concern among chest physicians. Among the wide variety of agents that are available for pleurodesis, povidone iodine is now perhaps the most sought after agent as it is cheap, easily available, effective and safe. This study was conducted to establish the efficacy and safety of povidone iodine as an agent for pleurodesis in patients with recurrent pleural effusion and pneumothorax. METHODS A total of 38 consecutive patients with symptomatic malignant or recurrent pleural effusion and pneumothorax received povidone iodine for pleurodesis over a period of 18 months. The mean follow-up period was 10.2 months, with a standard deviation of 2.9 months. RESULTS Out of the 38 patients, 29 had malignant pleural effusion, eight had recurrent pneumothorax and one had tubercular pleural effusion which was nonresponsive to antitubercular therapy. A complete response with no recurrence during follow-up was obtained in 34 (89.5 percent) patients. All the cases of failure had malignant pleural effusion. Three (7.9 percent) patients experienced intense chest pains after the installation of sclerosing agent, but they recovered with immediate symptomatic management. CONCLUSION Recurrent pleural effusion or pneumothorax due to any cause may be managed effectively and safely by chemical pleurodesis with povidone iodine. It may be considered as the agent of choice to achieve pleurodesis, especially in resource constrained countries like India, as it is inexpensive and easily available.
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Singh BJ, Sengupta A, Das SK, Ghosh D, Basak B. A comparative study of different graft materials used in myringoplasty. Indian J Otolaryngol Head Neck Surg 2009; 61:131-4. [PMID: 23120620 DOI: 10.1007/s12070-009-0051-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
Two hundred twenty cases of unilateral chronic suppurative otitis media (CSOM) with dry central perforation were chosen for this study and myringoplasty were done. Age group ranged from 13 to 48 years. Four types of autogenous tissues were used as graft material. Grafting was done by underlay technique when temporalis fascia, tragal perichondrium, areolar tissue were used as graft material and when fat graft was used the ear lobule fat was placed directly into perforation through transcanal route. Postoperative follow-up was carried out up to 6 months. In this study, it was found that the younger age group has less impairment of hearing and better chance of tympanic membrane perforation closure than the older age group in CSOM with central perforation. Anterior perforations has less impairment of hearing and better result in successful closure of tympanic membrane than posterior perforation group. It was also observed that larger the size of perforation greater is the hearing impairment preoperatively and postoperative hearing gain is also less compared to small perforation. Best hearing improvement occurred using temporalis fascia. Failure occurred may be due to postoperative infection, respiratory tract infection, neglected post-operative advice etc.
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Sengupta A, Banerjee S. Pleiotropic p27(Kip1), BCR-ABL and leukemic stem cell: the trio in concert. Leukemia 2007; 21:2559-61. [PMID: 17611557 DOI: 10.1038/sj.leu.2404842] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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91
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Sengupta A, Banerjee D, Chandra S, Banerji SK, Ghosh R, Roy R, Banerjee S. Deregulation and cross talk among Sonic hedgehog, Wnt, Hox and Notch signaling in chronic myeloid leukemia progression. Leukemia 2007; 21:949-55. [PMID: 17361218 DOI: 10.1038/sj.leu.2404657] [Citation(s) in RCA: 117] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Deciphering the BCR-ABL-independent signaling exploited in chronic myeloid leukemia (CML) progression is an important aspect in cancer stem-cell biology. CML stem-cell compartment is dynamic as it progresses to terminal blast crisis where myeloid and lymphoid blasts fail to differentiate. We demonstrate cross-regulation of signaling network involving Sonic hedgehog (Shh), Wnt, Notch and Hox for the inexorable blastic transformation of CD34(+) CML cells. Significant upregulation in Patched1, Frizzled2, Lef1, CyclinD1, p21 (P < or =0.0002) and downregulation of HoxA10 and HoxB4 (P< or =0.0001) transcripts in CD34(+) cells distinguish blast crisis from chronic CML. We report Shh-dependent Stat3 activation orchestrates these mutually interconnected signaling pathways. Stimulation of CD34(+) CML cells with either soluble Shh or Wnt3a did not activate Akt or p44/42-mitogen activated protein kinase (MAPK) pathways. Interestingly, unlike dominant negative Stat3beta, introduction of constitutive active Stat3 in CD34(+) CML cells induces cross-regulation in gene expression. Additionally, Shh and Wnt3a-dependent regulation of cyclin-dependent kinase inhibitors (CDKI) in CML suggests their role in the network. Taken together, our findings propose that deregulation in the form of hyperactive Shh and Wnt with repressed Notch and Hox pathways involving Stat3, Gli3, beta-catenin, CyclinD1, Hes1, HoxA10 and p21 might act synergistically to form an important hub in CML progression.
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Mitra S, Banerjee S, Misra C, Singh RK, Roy A, Sengupta A, Panda CK, Roychoudhury S. Interplay between human papilloma virus infection and p53 gene alterations in head and neck squamous cell carcinoma of an Indian patient population. J Clin Pathol 2006; 60:1040-7. [PMID: 17079356 PMCID: PMC1972436 DOI: 10.1136/jcp.2005.034835] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
AIM To investigate the complex interplay between human papilloma virus (HPV) infection and p53 gene alteration in 92 head and neck squamous cell carcinoma (HNSCC) and 28 leukoplakia samples from eastern India. METHODS DNA isolated from the patient samples was subjected to HPV detection, loss of heterozygosity (LOH) analysis of the chromosome 17p region harbouring p53, genotyping at the p53 codon 72 locus and sequencing of the entire p53 gene to identify somatic mutations. Codon 72 heterozygotes carrying the p53 mutation were further cloned and resequenced to identify the allele harbouring the mutation. RESULTS HPV positivity in the HNSCC samples was 69%; 21% of the HNSCC were found to harbour p53 mutations in the coding region of the gene. The absence of the p53 mutation in HPV positive tumours was statistically significant compared to the HPV negative tumours (p = 0.01), but the same did not hold true for p53 LOH (p = 1.0). Among the germline p53 codon 72 heterozygotes, the Pro allele was preferentially lost (p = 0.02) while the Arg allele was mutated in the majority of cases. The risk of HPV mediated tumourigenesis increased with the increase in number of Arg alleles at the codon 72 locus. CONCLUSION It is proposed that genetic and epigenetic alteration of p53 follow distinct pathways during the development of HNSCC from normal epithelium via dysplasia. The p53 mutation and HPV mediated p53 inactivation possibly constitute two independent pathways of tumourigenesis.
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Sengupta A, Sengupta C, Mazumder UK. Chemical Investigations on Celastrus paniculatus Seed Oil I. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/lipi.19870890308] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Mense SM, Sengupta A, Zhou M, Lan C, Bentsman G, Volsky DJ, Zhang L. Gene expression profiling reveals the profound upregulation of hypoxia-responsive genes in primary human astrocytes. Physiol Genomics 2006; 25:435-49. [PMID: 16507782 DOI: 10.1152/physiolgenomics.00315.2005] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Oxygen is vital for the development and survival of mammals. In response to hypoxia, the brain initiates numerous adaptive responses at the organ level as well as at the molecular and cellular levels, including the alteration of gene expression. Astrocytes play critical roles in the proper functioning of the brain; thus the manner in which astrocytes respond to hypoxia is likely important in determining the outcome of brain hypoxia. Here, we used microarray gene expression profiling and data-analysis algorithms to identify and analyze hypoxia-responsive genes in primary human astrocytes. We also compared gene expression patterns in astrocytes with those in human HeLa cells and pulmonary artery endothelial cells (ECs). Remarkably, in astrocytes, five times as many genes were induced as suppressed, whereas in HeLa and pulmonary ECs, as many as or more genes were suppressed than induced. More genes encoding hypoxia-inducible functions, such as glycolytic enzymes and angiogenic growth factors, were strongly induced in astrocytes compared with HeLa cells. Furthermore, gene ontology and computational algorithms revealed that many target genes of the EGF and insulin signaling pathways and the transcriptional regulators Myc, Jun, and p53 were selectively altered by hypoxia in astrocytes. Indeed, Western blot analysis confirmed that two major signal transducers mediating insulin and EGF action, Akt and MEK1/2, were activated by hypoxia in astrocytes. These results provide a global view of the signaling and regulatory network mediating oxygen regulation in human astrocytes.
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Mahalakshmi R, Sengupta A, Raghothama S, Shamala N, Balaram P. Tryptophan-containing peptide helices: interactions involving the indole side chain. ACTA ACUST UNITED AC 2006; 66:277-96. [PMID: 16218995 DOI: 10.1111/j.1399-3011.2005.00301.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Two designed peptide sequences containing Trp residues at positions i and i + 5 (Boc-Leu-Trp-Val-Ala-Aib-Leu-Trp-Val-OMe, 1) as well as i and i + 6 (Boc-Leu-Trp-Val-Aib-Ala-Aib-Leu-Trp-Val-OMe, 2) containing one and two centrally positioned Aib residues, respectively, for helix nucleation, have been shown to form stable helices in chloroform solutions. Structures derived from nuclear magnetic resonance (NMR) data reveal six and seven intramolecularly hydrogen-bonded NH groups in peptides 1 and 2, respectively. The helical conformation of octapeptide 1 has also been established in the solid state by X-ray diffraction. The crystal structure reveals an interesting packing motif in which helical columns are stabilized by side chain-backbone hydrogen bonding involving the indole Nepsilon1H of Trp(2) as donor, and an acceptor C=O group from Leu(6) of a neighboring molecule. Helical columns also associate laterally, and strong interactions are observed between the Trp(2) and Trp(7) residues on neighboring molecules. The edge-to-face aromatic interactions between the indoles suggest a potential C-H...pi interaction involving the Czeta3H of Trp(2). Concentration dependence of NMR chemical shifts provides evidence for peptide association in solution involving the Trp(2) Nepsilon1H protons, presumably in a manner similar to that observed in the crystal.
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Khan SY, Paul R, Sengupta A, Roy P. Clinical study of otological manifestations in cases of cleft palate. Indian J Otolaryngol Head Neck Surg 2006; 58:35-7. [PMID: 23120233 PMCID: PMC3450604 DOI: 10.1007/bf02907736] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
Cleft palate (with or without cleft lip) occurs in about 1: 750-1: 2000 births in different societies in the world. Cleft palate individuals have a greater incidence of hearing loss than the general population. The primary cause of the ear problem in cleft patients is eustachian tube dysfunction. The cause for which is abnormal insertion of levator veli palatini and tensor veli palatini muscles into the posterior margin of the hard palate and the palatal aponeurosis and associated muscular hypoplasia.
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Kundu S, Mandal S, Sengupta A, Dey A. A rare case of primary mediastinal non-seminomatous germ cell carcinoma in a 18 year old boy. Lung India 2006. [DOI: 10.4103/0970-2113.44389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Sengupta A, Mahalakshmi R, Shamala N, Balaram P. Aromatic interactions in tryptophan-containing peptides: crystal structures of model tryptophan peptides and phenylalanine analogs. ACTA ACUST UNITED AC 2005; 65:113-29. [PMID: 15686542 DOI: 10.1111/j.1399-3011.2004.00191.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The crystal structures of the peptides, Boc-Leu-Trp-Val-OMe (1), Ac-Leu-Trp-Val-OMe (2a and 2b), Boc-Leu-Phe-Val-OMe (3), Ac-Leu-Phe-Val-OMe (4), and Boc-Ala-Aib-Leu-Trp-Val-OMe (5) have been determined by X-ray diffraction in order to explore the nature of interactions between aromatic rings, specifically the indole side chain of Trp residues. Peptide 1 adopts a type I beta-turn conformation stabilized by an intramolecular 4-->1 hydrogen bond. Molecules of 1 pack into helical columns stabilized by two intermolecular hydrogen bonds, Leu(1)NH...O(2)Trp(2) and IndoleNH...O(1)Leu(1). The superhelical columns further pack into the tetragonal space group P4(3) by means of a continuous network of indole-indole interactions. Peptide 2 crystallizes in two polymorphic forms, P2(1) (2a) and P2(1)2(1)2(1) (2b). In both forms, the peptide backbone is extended, with antiparallel beta-sheet association being observed in crystals. Extended strand conformations and antiparallel beta-sheet formation are also observed in the Phe-containing analogs, Boc-Leu-Phe-Val-OMe (3) and Ac-Leu-Phe-Val-OMe (4). Peptide 5 forms a short stretch of 3(10)-helix. Analysis of aromatic-aromatic and aromatic-amide interactions in the structures of peptides, 1, 2a, 2b are reported along with the examples of 14 Trp-containing peptides from the Cambridge Crystallographic Database. The results suggest that there is no dramatic preference for a preferred orientation of two proximal indole rings. In Trp-containing peptides specific orientations of the indole ring, with respect to the preceding and succeeding peptide units, appear to be preferred in beta-turns and extended structures.
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Das RK, Ghosh S, Sengupta A, Das S, Bhattacharya S. Inhibition of DMBA/croton oil-induced two-stage mouse skin carcinogenesis by diphenylmethyl selenocyanate. Eur J Cancer Prev 2004; 13:411-7. [PMID: 15452454 DOI: 10.1097/00008469-200410000-00009] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Selenium, an essential micronutrient, is associated with antioxidant functions, physiological defence mechanisms against different diseases including several types of cancers. Search for new selenium compounds with more chemopreventive activities and lesser toxicities are in progress. In the present study, the antioxidative roles of a synthetic organoselenium compound, diphenylmethyl selenocyanate, were evaluated against 7,12-dimethylbenz(a)anthracene (DMBA)/croton oil-induced two-stage mouse skin carcinogenesis model. The compound was administered orally in carcinogen-induced mice in two different non-toxic doses: 2 mg/kg body weight and 3 mg/kg body weight. Significant inhibition in the incidence of papilloma formation (58-80%) as well as in the cumulative number of papilloma per papilloma-bearing mouse were observed in the treated groups as compared with the carcinogen control group. The compound was also found to significantly upregulate different phase II detoxifying enzymes in liver cytosol such as glutathione-S-transferase (P<0.01), catalase (P<0.01) and superoxide dismutase (SOD) (P<0.01) when measured after 15 days and also after 12 weeks of first DMBA treatment. Lipid peroxidation measured as the thiobarbituric acid reactive substances in liver microsomes was significantly inhibited (P<0.05) in a dose-dependent manner by diphenylmethyl selenocyanate. Thus the compound exerts its chemopreventive activity by reducing papilloma formation during chemically induced carcinogenesis, which in turn, may be through modulating the level of lipid peroxidation and phase II detoxifying enzyme system at the doses evaluated.
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