151
|
Nickoloff E, Dutta A, Lu Z, So J, Ruzal-Shapiro C. SU-DD-A2-04: Direct Measurement of Pediatric CT Radiation Dose with a New Solid State Detector System. Med Phys 2005. [DOI: 10.1118/1.1997421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
152
|
Thomas MB, Dutta A, Brown T, Charnsangavej C, Rashid A, Hoff PM, Dancey J, Abbruzzese JL. A phase II open-label study of OSI-774 (NSC 718781) in unresectable hepatocellular carcinoma. J Clin Oncol 2005. [DOI: 10.1200/jco.2005.23.16_suppl.4038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
153
|
Nickoloff E, Lu Z, So J, Dutta A. SU-FF-I-09: Comparison of Radiation Dose Indexes For CT Scanners: Measured Verses Automated Scanner Calculations. Med Phys 2005. [DOI: 10.1118/1.1997489] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
154
|
Das AK, Kashyap RC, Dutta A. Facial Nerve Neuroma : A Case Report. Med J Armed Forces India 2005; 61:184-5. [DOI: 10.1016/s0377-1237(05)80022-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2002] [Accepted: 10/20/2003] [Indexed: 10/18/2022] Open
|
155
|
Mondal RK, Dutta A, Basu K, Chakraborti S. Virchows node: rare presentation of childhood hepatocellular carcinoma. Indian J Pediatr 2005; 72:177-8. [PMID: 15758545 DOI: 10.1007/bf02760707] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Cervical (supra-clavicular) lymphadenopathy may not always be due to tuberculosis in children. Hepatocellular carcinoma in children even may present as supra clavicular lymphadenopathy (Virchow's node).
Collapse
|
156
|
Dutta A, Kumra VP, Sood J, Swaroop A. Guided tactile probing: a modified blind orotracheal intubation technique for the problem-oriented difficult airway. Acta Anaesthesiol Scand 2005; 49:106-9. [PMID: 15675994 DOI: 10.1111/j.1399-6576.2004.00545.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We present 'tactile probing', a guided approach to blind orotracheal intubation to secure a problem-oriented anticipated difficult airway in a 55-year-old male patient scheduled for elective surgical tracheostomy for a postradiotherapy translaryngeal carcinoma. Standard techniques to gain the airway were inapplicable in this case and awake flexible fiberoscopy-aided intubation had already failed.
Collapse
|
157
|
Chatterjee M, Sarkar D, Dutta A, Das M, Sarkar K, Mandal C. Effect of Aloe vera on nitric oxide production by macrophages during inflammation. Indian J Pharmacol 2005. [DOI: 10.4103/0253-7613.19073] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
|
158
|
Katiyar CK, Arora D, Mehrotra R, Nandi AR, Dutta A, Jain AK. Management of chronic hepatitis B with New Livfit in end stage renal disease. INDIAN JOURNAL OF PHYSIOLOGY AND PHARMACOLOGY 2005; 49:83-8. [PMID: 15881863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
New Livfit (NLF) is a standardized, poly-herbal formulation that has been found useful in the management of hepatitis. The aim of this placebo-controlled study was to evaluate its usefulness against hepatitis B virus in the patients of end stage renal disease (ESRD). Patients were regularly evaluated at 6, 12, 24 and 36 weeks of therapy. With 36 weeks of treatment of NLF, there was rapid clearing of HBV-DNA in a significant number of patients. Significant seroconversion of the other markers of hepatitis B and restoration of the raised levels of ALT and AST was observed. The study suggests the potential usefulness of NLF in the control of HBV infection in the patients of ESRD prior to renal transplant.
Collapse
|
159
|
Dutta A, Chengara A, Nikolov A, Wasan D, Chen K, Campbell B. Destabilization of aerated food products: effects of Ostwald ripening and gas diffusion. J FOOD ENG 2004. [DOI: 10.1016/s0260-8774(03)00230-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
160
|
Dutta A, Basu P. An Investigation on Heat Transfer to the Standpipe of a Circulating Fluidized Bed Boiler. Chem Eng Res Des 2003. [DOI: 10.1205/026387603322482239] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
161
|
|
162
|
Malhotra SK, Dutta A, Singh G. Counting the way to induction of anaesthesia. Paediatr Anaesth 2003; 13:180-1. [PMID: 12562496 DOI: 10.1046/j.1460-9592.2003.01019_3.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
163
|
Dutta A, Chengara A, Nikolov A, Wasan D, Chen K, Campbell B. Effect of Surfactant Composition on Aeration Characteristics and Stability of Foams in Aerated Food Products. J Food Sci 2002. [DOI: 10.1111/j.1365-2621.2002.tb08862.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
164
|
Malhotra SK, Joshi M, Grover S, Sharma SC, Dutta A. Auditory function following spinal analgesia. Comparison of two spinal needles. Eur J Anaesthesiol 2002; 19:69-72. [PMID: 11913806 DOI: 10.1017/s026502150200011x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND AND OBJECTIVE Auditory impairment is among the lesser known complications of spinal analgesia. The aim of the present study was to determine the degree of vestibulocochlear dysfunction in patients undergoing spinal analgesia for lower abdominal surgery. METHODS Eighty patients who had received spinal analgesia for lower abdominal surgery were studied. Males were undergoing inguinal herniorraphy and the females tubectomy. Audiograms were performed before operation and on the second and seventh postoperative days. Hearing levels were measured from 250 Hz-8 kHz. In Group 1 (n = 40) a 22-gauge, cutting type of spinal needle (Howard Jones) was used. In Group 2 (n = 40) a 25-gauge, non-cutting spinal needle (Whitacre) was used. RESULTS Hearing loss >10 dB was noticed in three patients in Group 1 and none in Group 2. The mean hearing level was more reduced in Group 1 patients. CONCLUSIONS Use of cutting type spinal needle is associated with a greater decrease in mean hearing levels compared to the non-cutting type.
Collapse
|
165
|
|
166
|
Sripriya R, Banerjee P, Rao P, Dutta A, Rao M. Critical evaluation of factors affecting the operation of dense medium cyclones treating medium coking coals. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s0301-7516(01)00048-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
167
|
Malhotra SK, Khaitan A, Goswami AK, Gill KD, Dutta A. Monitoring of irrigation fluid absorption during percutaneous nephrolithotripsy: the use of 1% ethanol as a marker. Anaesthesia 2001; 56:1103-6. [PMID: 11703245 DOI: 10.1046/j.1365-2044.2001.01962-3.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
This study was performed in 32 ASA I patients undergoing percutaneous nephrolithotripsy under general anaesthesia, using absorption of 1% ethanol as a marker to monitor irrigation fluid absorption. Various parameters of fluid absorption were studied and compared, including irrigation fluid volume, irrigation time, total volume of irrigation fluid absorbed and the rate of irrigation. The amount of irrigant used vs. the volume absorbed and the volume absorbed vs. total irrigation time were observed. Fluid absorption occurred in 78% of patients, and 28% absorbed volumes in excess of 1 l. The mean volume of fluid absorbed was 696.7 ml. The maximum fluid absorption was observed when the irrigation fluid volume, total irrigation time and irrigation rate exceeded 10 l, 30 min and 200 ml.min(-1), respectively. In conclusion, this study has shown 1% ethanol to be a safe, simple and cost-effective marker of fluid absorption during percutaneous nephrolithotripsy associated with minimal adverse effects.
Collapse
|
168
|
Dutta A, Batra YK, Mohan AR, Chari P. An unusual solution to unsuspected difficult airway: the esophageal dilator guide. Can J Anaesth 2001; 48:1048-9. [PMID: 11698332 DOI: 10.1007/bf03016602] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
|
169
|
Malhotra SK, Khaitan A, Goswami AK, Gill KD, Dutta A. Monitoring of irrigation fluid absorption during percutaneous nephrolithotripsy: the use of 1% ethanol as a marker. Anaesthesia 2001. [DOI: 10.1111/j.1365-2044.2001.1962-3.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
170
|
|
171
|
Chaudhuri B, Xu H, Todorov I, Dutta A, Yates JL. Human DNA replication initiation factors, ORC and MCM, associate with oriP of Epstein-Barr virus. Proc Natl Acad Sci U S A 2001; 98:10085-9. [PMID: 11517328 PMCID: PMC56919 DOI: 10.1073/pnas.181347998] [Citation(s) in RCA: 158] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2001] [Accepted: 07/09/2001] [Indexed: 11/18/2022] Open
Abstract
The 165-kb chromosome of Epstein-Barr virus (EBV) is replicated by cellular enzymes only once per cell cycle in human cells that are latently infected. Here, we report that the human origin recognition complex, ORC, can be detected in association with an EBV replication origin, oriP, in cells by using antibodies against three different subunits of human ORC to precipitate crosslinked chromatin. Mcm2, a subunit of the MCM replication licensing complex, was found to associate with oriP during G(1) and to dissociate from it during S phase. The detection of ORC and Mcm2 at oriP was shown to require the presence of the 120-bp replicator of oriP. Licensing and initiation of replication at oriP of EBV thus seem to be mediated by ORC. This is an example of a virus apparently using ORC and associated factors for the propagation of its genome.
Collapse
|
172
|
Dhar SK, Yoshida K, Machida Y, Khaira P, Chaudhuri B, Wohlschlegel JA, Leffak M, Yates J, Dutta A. Replication from oriP of Epstein-Barr virus requires human ORC and is inhibited by geminin. Cell 2001; 106:287-96. [PMID: 11509178 DOI: 10.1016/s0092-8674(01)00458-5] [Citation(s) in RCA: 235] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A hypomorphic mutation made in the ORC2 gene of a human cancer cell line through homologous recombination decreased Orc2 protein levels by 90%. The G1 phase of the cell cycle was prolonged, but there was no effect on the utilization of either the c-Myc or beta-globin cellular origins of replication. Cells carrying this mutation failed to support the replication of a plasmid bearing the oriP replicator of Epstein Barr virus (EBV), and this defect was rescued by reintroduction of Orc2. Orc2 specifically associates with oriP in cells, most likely through its interaction with EBNA1. Geminin, an inhibitor of the mammalian replication initiation complex, inhibits replication from oriP. Therefore, ORC and the human replication initiation apparatus is required for replication from a viral origin of replication.
Collapse
|
173
|
Abstract
All the human homologs of the six subunits of Saccharomyces cerevisiae origin recognition complex have been reported so far. However, not much has been reported on the nature and the characteristics of the human origin recognition complex. In an attempt to purify recombinant human ORC from insect cells infected with baculoviruses expressing HsORC subunits, we found that human ORC2, -3, -4, and -5 form a core complex. HsORC1 and HsORC6 subunits did not enter into this core complex, suggesting that the interaction of these two subunits with the core ORC2-5 complex is extremely labile. We found that the C-terminal region of ORC2 interacts directly with the N-terminal region of ORC3. The C-terminal region of ORC3 was, however, necessary to bring ORC4 and ORC5 into the core complex. A fragment containing the N-terminal 200 residues of ORC3 (ORC3N) competitively inhibited the ORC2-ORC3 interaction. Overexpression of this fragment in U2OS cells blocked the cells in G(1), providing the first evidence that a mammalian ORC subunit is important for the G(1)-S transition in mammalian cells.
Collapse
|
174
|
Wohlschlegel JA, Dwyer BT, Takeda DY, Dutta A. Mutational analysis of the Cy motif from p21 reveals sequence degeneracy and specificity for different cyclin-dependent kinases. Mol Cell Biol 2001; 21:4868-74. [PMID: 11438644 PMCID: PMC87195 DOI: 10.1128/mcb.21.15.4868-4874.2001] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Inhibitors, activators, and substrates of cyclin-dependent kinases (cdks) utilize a cyclin-binding sequence, known as a Cy or RXL motif, to bind directly to the cyclin subunit. Alanine scanning mutagenesis of the Cy motif of the cdk inhibitor p21 revealed that the conserved arginine or leucine (constituting the conserved RXL sequence) was important for p21's ability to inhibit cyclin E-cdk2 activity. Further analysis of mutant Cy motifs showed, however, that RXL was neither necessary nor sufficient for a functional cyclin-binding motif. Replacement of either of these two residues with small hydrophobic residues such as valine preserved p21's inhibitory activity on cyclin E-cdk2, while mutations in either polar or charged residues dramatically impaired p21's inhibitory activity. Expressing p21N with non-RXL Cy sequences inhibited growth of mammalian cells, providing in vivo confirmation that RXL was not necessary for a functional Cy motif. We also show that the variant Cy motifs identified in this study can effectively target substrates to cyclin-cdk complexes for phosphorylation, providing additional evidence that these non-RXL motifs are functional. Finally, binding studies using p21 Cy mutants demonstrated that the Cy motif was essential for the association of p21 with cyclin E-cdk2 but not with cyclin A-cdk2. Taking advantage of this differential specificity toward cyclin E versus cyclin A, we demonstrate that cell growth inhibition was absolutely dependent on the ability of a p21 derivative to inhibit cyclin E-cdk2.
Collapse
|
175
|
Delmolino LM, Saha P, Dutta A. Multiple mechanisms regulate subcellular localization of human CDC6. J Biol Chem 2001; 276:26947-54. [PMID: 11346650 DOI: 10.1074/jbc.m101870200] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
CDC6 is a protein essential for DNA replication, the expression and abundance of which are cell cycle-regulated in Saccharomyces cerevisiae. We have demonstrated previously that the subcellular localization of the human CDC6 homolog, HsCDC6, is cell cycle-dependent: nuclear during G(1) phase and cytoplasmic during S phase. Here we demonstrate that endogenous HsCDC6 is phosphorylated during the G(1)/S transition. The N-terminal region contains putative cyclin-dependent kinase phosphorylation sites adjoining nuclear localization sequences (NLSs) and a cyclin-docking motif, whereas the C-terminal region contains a nuclear export signal (NES). In addition, we show that the observed regulated subcellular localization depends on phosphorylation status, NLS, and NES. When the four putative substrate sites (serines 45, 54, 74, and 106) for cyclin-dependent kinases are mutated to alanines, the resulting HsCDC6A4 protein is localized predominantly to the nucleus. This localization depends upon two functional NLSs, because expression of HsCDC6 containing mutations in the two putative NLSs results in predominantly cytoplasmic distribution. Furthermore, mutation of the four serines to phosphate-mimicking aspartates (HsCDC6D4) results in strictly cytoplasmic localization. This cytoplasmic localization depends upon the C-terminal NES. Together these results demonstrate that HsCDC6 is phosphorylated at the G(1)/S phase of the cell cycle and that the phosphorylation status determines the subcellular localization.
Collapse
|